DC Motor

Hi Guys, I have a 15.6 volt dc motor taken out of a handheld vacuum cleaner. is this suitable to use in a small wind generator as a project with my kids. when i attach it to a power drill and spin it from the shaft i dont seem to get any power generation. If i connect it to a 12v battery is spins real fast. any help would be appreciated sam

Question by sam301   |  last reply

Current Consumtion by a DC Motor?

 I am asking few questions EV related, more current related. Let a consider a dc motor rated 4hp at 24v and 2hp at 12v. So is there a way to calculate ampere draw of the motor at various loads.(like no load, full load, or any load). And if we know the full load current of the dc motor then can we calculate the max load for the dc motor. Next as the dc motor is 2hp at 12v then will this value be constant or will the motor be able to produce 4hp at 12v even rather than at 24v. And will a battery eg 50ah be able to supply more then 50amp.

Topic by flyingdutchmen1659   |  last reply

Rugged motors?

Does anybody know of a source of motors that are rugged enough to survive long-term* on the surf-line of a beach?  They wouldn't need to survive flying rocks, but saltwater and sand proof would be good. The plan is to use them in reverse, as generators, so DC is preferable. *In the first instance, "long term" means "more than half an hour".

Question by Kiteman   |  last reply

Measuring Current of 24v dc motor

How to measure the max current of 24v dc motor.. please give me step by step guidance. many thanks

Topic by epple   |  last reply

how can i run dc motor with specific criterias as per detail?

1) the motor should move forward for cirtain RPM then STOP when supply is on. 2) the motor should move reverse with exact same RPM then STOP when supply CUT OFF. the supply volage is 230V the motor is 12V DC.

Question by jdixit89   |  last reply

Chosing a Motor for EV Motorcycle

I am thinking of building a EV Motorcycle. But I don't want to make any finical commitment unitl I know exactly how much I have to pay.my question for the day is:i see many motors, and motor controllers that "support regen" i know what regen is, and i don't want a bike without it. but do i have to match a motor that "supports regen" with a controller that "supports regen" or can i just buy any motor with the proper voltage and buy a "regen" controller.i realize that i would be very convient to use a kit like http://www.robotmarketplace.com/products/ETK-ETEKBL250.html but if i can drop the cost, by useing other sites that would be great if you have prefered sites for specific products, that would be great.-thank you for you time.

Topic by JZ Price   |  last reply


My car is not moving forward. Can someone help me with the error I might have made. I am using a 100ml pet bottle, DC motor, 9 V battery and a fan . The steps GIVEN  are very clear yet thr is something I missed. Pls help

Topic by MonaG5   |  last reply

Low Cost DC motor Controler?

I want to power a 90 Volt, 5amp Perment Brush type DC Gear Motor. The, "Variable speed controller", needs to be able to use 115v AC or 115v DC input power, which is selectable by the operator. I have used a Staco variable tranformer which uses 115v AC input and rectified the output to drive the motor. But also need the 115v DC input option.

Question by Realdann   |  last reply

is the 250 rpm dc motor is good for electric bike??

Is the 8kg-cm and 250 rpm dc motor is good for electric bike??  hi i have a 12v dc geared motor 250 : rpm 8 km-cm : torque is this good for build ebike ??

Question by ShocoM   |  last reply

12V DC Motor Wind Turbine

Hi im trying to build a wind turbine.The purpose of the wind turbine is to determine the maximum amount of power it can produce with different loads. It needs to produce at least two watts of power during testing, I tried using a potentiometer but it started smoking. I need to record voltage, current and power. I needed to know how to set this up, and if I can use resistors instead of a potentiometer. I have power supplydmmresistorsblade12V DCWires

Question by hj212121   |  last reply

Rewinding a DC motor for different voltages

I modified small DC motors, like used in toys and such but now I have one that requires to do it properly.Motor in question runs on 24V and uses about 3.5A under full load.Drives a high pressure water pump on either side of the shaft.The rotor is basically empty with just a few turns of wire and lots of empty space.I assume the same model is used for multiple power configurations by the manufacturer.For the toys my basic approach was to just calculated the number of turns or to count them when removing.From there I get the voltage per turn and can rewind accordingly.So in theory and by blissfully ignoring all higher things involved I could do this motor the same way.Right now I see 10 windings per coil, so with thicker wire I would use 5 to run it on 12V at roughly the same speed.Only problem is that thing then would use around 7.5 to 8A when running under full load and get quite hot.I need the speed to keep the flowrate at the same 7.5L per minute but I also need the power to be able to still get the 120PSI from just 12V.Isn't there any winding trickery that would allow me to reduce the required current a bit without sacrificing on speed or torque?

Topic by Downunder35m   |  last reply

Electric Power DC Generator

I've been toying with the idea of trying to build an electric generator that after receiving initial power to start, could power an electric motor that would in turn somehow power 1 or more generators and would not only produce enough power to continuously power the motor, but also allow it to distribute power for use with an inverter or stored in batteries. Am I crazy that I dont see where anyone has tried this or is it just not possible? Obviously, there would be friction forces from the generator(s) on the motor and it may be difficult to produce enough power to even run the motor, but does anyone know of anyone that has tried this? I've been reading peoples posts and really enjoy looking at other peoples ideas on this site and decided to sign up. Thanks.

Question by AggieTX   |  last reply

DC magnetics motors and anything else DC

I'm having inventors block figured i'd try to get some other users talking about ideas for dc projects and i'd get a different angle on my work so please post.

Topic by Sessha   |  last reply

How to wire a preset counter to a dc motor?

I have a dc motor and a counter to count revolutions. I want the dc motor to shut down automatically when the motor has reached a certain number of revolutions. The counter has the ability to do this but I don't know how to wire the motor to make this happen. I am controlling the motor with a pwm.  The counter is a Sestos. 

Question by jesse.revel   |  last reply

brushed induction motor confusion? [answered] Answered

My father and I are currently restoring a metal-working lathe, however, we do not have 3 phase power to power the original 0.5HP 3 phase motor. We do, however, have a slightly smaller 0.25HP motor. At first appearance, it seemed to be a simple AC/DC brushed motor with a field and winding on the armature. There was no wiring diagram supplied with it, but in one configuration (what appeared to be the ameuture and field coils) are wired in parallel for 120V operation. This did not seem right, since the field coils will be simply shorted across the mains, but I assumed that since we are dealing with AC and inductors, this is OK. It works flawlessly, but reversing the polarity of either the fields or armature would cause the motor to sit and buzz. If started manually, it took off slowly but sounded awful. I need the motor to rotate in both directions and do not have enough materials to do this mechanically. On closer inspection after dismantling the motor, it appears there are 4 brushes, connected together in 2 pairs. They are not directly connected to anything. The 4 wires coming out seem to be just for wiring both field coils in either series of parallel for 110V and 220V operation respectfully. Perhaps even more strange, the 4 brushes are mounted on a centripetal switch, which disengage the brushes from the armature. I was able to make out on the rust that it said "revolution induction motor." So I reasoned out that after the fields are energized, it will induce an electrical current in a few of the coils on the armature, and the energy would flow to the other 2 sets of brushes, causing a different set of coils on the amature to energize and this would initially start the motor. After it gets going, the switch disconnects all the brushes and the motor operates as a simple induction motor. My father used to rebuild motors for a small company, and this is in fact one of the motors he repaired. Although he is skilled at this practice, he does not understand the operation of induction motors and can only figure out wiring by strictly following a diagram or trial and error. I am curious about what this type of motor even is, and how it works! In th meantime, I will research induction motors and how they work, and see what I can learn.

Question by -max-   |  last reply

How do I wire a 12V DC motor to micro switches, relay digital timer and battery?

I am wanting to wire up a door to my hen house that will open in the AM and close in the PM. I have a 12V DC powered cordless drill motor and a digital timer. Can you help me on what I need to make this all work as far as switches, relay, etc. and possibly give me some guidance on how to wire it up? Just so you know, I have very limited electrical experience. Thank you. Rod

Question by dobecool   |  last reply

overheating transistor on DC motor control circuit

I am trying to control a DC motor using 4 transistors, i am using 547 transistors connected to a motor with two on each axis, the opposite corners are wired together with two pushbuttons, the transistors change the polarity of the motor so that if one button i pressed the motor spins one way, the other button vice versa, but the motor is running very slowly in this setup and the last two transistor that go from the motor to ground heat up very quickly. the circuit works fine with only one transistor but i want to be able to change the direction of spin, does anyone know why the transistors are acting like this or a better circuit to control a DC motor? thanks very much!

Topic by sholtob   |  last reply

Treadmill DC Motor For Electric Vehicle Project? Answered

I am going to start a small EV project. I have seen that most treadmill motors are 3 to 4hp powerful. I wanted to know weather these motors will be suitable for my project. I am building a small kart capable of carrying maximum 2 persons. Also if they are suitable for my project please can someone suggest me 3 or 4hp treadmill motors on eBay or other sites below 150$. Also I saw a formula on a site related to power for a vehicle   HP = W(V/234)^3 where HP=horsepower, W=weight in pounds and V=required velocity in MPH. I found this formula on this site (http://www.ajdesigner.com/phphorsepower/horsepower_equation_trap_speed_method_horsepower.php). Is this formula correct.

Question by flyingdutchmen1659   |  last reply

how can i use dc or ac motor as a generator?

Hi guys i'm doing an experiment by using a dc or ac powered motor as a home generator it is like a backup generator. I'm trying to do the experiment as part of free energy solution experiment. which motor is more reliable as i know that dc motor is good at speed control and it is cheap but it is high maintenance as for ac motor is almost the same as dc motor but the disadvantage of it is the back emf it will produce. hope guys can help me with this. thank you in advance.

Question by azri.azil   |  last reply

Does anyone have any ideas on how to build a simple but reliable motor controller for a high voltage (500v) DC motor?

I need to make a high voltage (500V), high current (20A) DC motor controller that uses a DC power source. It must be reliable and last a long time, and it also needs to be able control the speed of the motor from zero and up. Any ideas on building one or perhaps one that I can buy? Thanks!

Question by ANDY!   |  last reply

I need a DC or AC motor of 100 Watt output running at 20,000rpm ?

For a very special purpose, we require a motor with the said requirement. Please help me how and where I can find such motor? Thanks

Question by shreyansk   |  last reply

Is this DC motor suitable for a wind turbine/bike generator?

Hi, so I have recently salvaged an old garage door motor, I have managed to a separate the DC motor from the casing and now I am converting it into a generator (by removing the metal core and replacing it with permanent magnets.) The motor's label says 120v, what can I make with a motor this size? Will this motor be acceptable to convert and make into a generator for wind turbine or bike? Label: THE CHAMBERLAIN GROUP INC. MOTOR No. 123D67 120V 60 Hz 4.5A 70 degrees C INT. DUTY THERM-PROTECTED  TYPE T. (CL. B (Odd symbol) OBJY2 188B72) ASSEMBLED IN MEXICO Thanks guys!

Question by Exploitation   |  last reply

The Newman Motor Challenge !

I was recently approached by someone claiming the old Newman Motor wouldn't be good for anything.Well, I was a little bit offended by this as I already had my little toy version of it as kid.At that time though it really was just a toy for me.Critics still say the Newman Motor is nothing more than some interesting machine.And even the biggest followers will admit it is not a free energy machine, just a very efficient one.I experimented with, what some call fringe science, now for about 30 years.And it all started with math and my interest in unusual ways of dealing with problems.So what's behind the challenge?The original design was suprisingly simple as you can see in the above Wiki link.Just a spinning magnet in a (split) coil.What you don't find anywhere though is real details on the how to.Sure, you need to have some sort of contact linked to the rotation and timing is critical but what does it all do?You can build a drt simple model in a few hours with stuff you might have around already.Quite a few Youtubers are happy to share their creations.The actual challenge is to come up with what Newman really did inside his drum.And also why I think it is not the full potential his machine had.Build a simple Newman motor and check for how long you can let it run on a charge super capacitor.Then sit back and read some of the other magnet stuff I wrote.After that come up with a better design ;)I started to create some 3D models that need testing once I find more free time - should take some leave one day..But for those with little patience and an interest in the Newman Motor I decided to share my current idea:For some it might be really confusing although they know motors and magnetic fields.Those just playing with magnets might have it easier for once as they can pretend they followed my thoughts ;)The original design used two coils and a rotating magnet.If you consider how the magnet creates an electromagntic field in the coils then you have to wonder right away how it can spin.And most designs will indeed need a push start to get going!You can't have electricity produced without the magnet spinning and you can't make it spin without electricity!The current from the battery or capacitor can only flow at the short moment of contact on the axle.This moment needs to be timed "mechanical" as we don't want to waste any power on not required electronics.If you ever bothered to check the timing of a Newman Motor then you realised the collapsing electromagnetic field at the moment of contact actually is in reverse to what the manget has in that position.Unlike any normal motor it means the magnet produces most of the power the coil needs to make the rotor spin!So far for the well known facts, now for my fiction:I would like to call my version the Aussie Newman Motor as all things downunder are just different ;)Here are my current desing mods, that I freely share so everyone can benefit form many years of experimenting to save a lot of time.1. Instead of two coils a not-really-bifilar coil is centered on the axle.The coil is created like two stacked relay coild that have no bobbin and a "dint" to allow the axle to pass through.Without the big gap of the original less of the magnetic field strenght is lost and the coil is far closer to a homogenous magnet.2. The timing done by salvaging a simple DC motor's contacts and brushes.This allows for far higher currents and if the salvaged motor had enough poles also for a very short "burst".3. The axle contact is made with a cleaned steel bearing.After cleaning very conductive copper based lubricant is used in tiny amounts to prevent corrosion and provide a lower resistance.The clear benefit is that with the new timing system a lot more current can flow.Initial tests with a mock up model showed an increase in run time from the capacitor of about 15% already.With proper bearings and a salvaged DC motor I hope to reach 18 to 20% more than the original design.Now why the DC motor if a reed contact or hall effect sensor would be even faster and with less resistence?Neither can handle really high currents without additional electronics ;)Plus of course I wanted to leave the door open for the Aussie Newman Motor 2020.You might now say "Why bother if the above improvements are already so great?".If you followed my elsewhere for a while then you know the Newman Motor is only 2D but I prefer 3D or more harmony if you like.Right now the imagination of people re-inventing Newman's machine is limited.They try to get on the horse from behind - literally.Fancy electronics, machined parts and so on.But they never go 3D ;)You got it? :)There is only two coils!!The magnet rotates, same as the contact on the axle.One set of coils for each contact the salvaged DC motor has.Each set aligend to the corresponding contact.And now you will ask "How do you plan to connect that to a single DC power source?Well, that is why it will be the 2020 model - my time for tinkering is sadly limited because I still need to work to support myself.But if you consider that the original as a good model can run for over 10 minutes on a supercapcitor then ask yourself how long it could run on 4 or even 8 coil sets.And although there is no such thing as "free energy": There will be still space for more coils.Or other coils to just provide electricity that does not power the motor.Critics will now see their chance and state that if we add a load to these additional coils then this will cause a strain on the system.Of course they are correct here.If, however, the load is mechanical then the motor needs to supply basically the same additional energy.Plus all mechanical losses.The question is: How much mechanical load can we add before the motor is down to the same efficiency of a very efficient DC motor? ;)And what if our Aussie Newman 2020 would actually violate the laws of physics?We can calculate how much electrical energy would be required so a given motor produces a fixed amount of torque.Or we can just measure it, the beauty of science...We can do the same in reverse of course.Let's say a mechanical pump would require 500RPM and 100Nm of torque to pump 100 liters per minute.Then we could calculate what sized motor we need to drive the thing and how much power the motor would need.So again: What if the Aussie Newman 2020 would require far less than what science makes us think and still does this job on a simple 12V lead acid batty of 4Ah?Just saying... ;)I hope to have a presentable and working 2 coil system by May, so stay tuned!In case you are faster or even beter then of course feel free to show off your results or to post a link to your Instructable so everyone can verify it.

Topic by Downunder35m   |  last reply

i want to convert my sewing machine motor to a dc motor as i need that motor to run my rc car!!;)can you plz assist?

I wanna make a big size rc car that can run really fast!i've learnt how to convert an ac motor to a dc motor but this sewing machine motor has got a 3 pin input with a connected speed controller!i wanna know how to convert this motor to a dc motor so that i can use Li-ion or lead acid battery.but the speed controller is not necessary i just wanna mount the motor on the chassis of my rc car.I dunno if this idea is good but i really wanna try doing this to make my rc car!please help me convert my motor to a dc motor!

Question by M.Brian   |  last reply

Electric Motor Tricycle 6V4.5Ah

I bought a riding toy for my son and it's cool, but it doesn't have enough power sometimes.  It's fast enough in the house, but it gets stuck outside.  The plastic wheels tend to slip on rough surfaces and inclines, but I can address that issue at the wheels/tires to some degree.  However, the battery that came with it is a 6V4.5AH/20HR sealed lead-acid rechargeable battery (It has F1 contacts, so unless I change or adapt the wires/connectors, I think I need to stick with a battery that has these).  The AC-DC adapter has 6V DC 500mA output, but I think I could get a UNIVERSAL AC DC ADAPTER {1.5V 3V 4.5V 6V 9V 12V 500mA} that would work with a new battery. I'm hoping that I can increase the power noticeably but safely.  One constraint is the width of the battery area inside the "engine" compartment.  It fits the present battery (1.75 x 2.75 x 4), but I'll have to mod the compartment to fit a replacement that's more than slightly bigger. I've seen some 12V4.5AH batteries online, but most are larger in every dimension. Am I even on the right track thinking a higher voltage battery is what I need?  Could I use an NiMH or Li battery/batteries instead? What's the easiest, safest, cheapest route for this mod? Thanks, Dan

Topic by danhorowitz   |  last reply

Quick Answer Please . I Have A 12 Volt Dc Motor And Would Like To Make A Generator With It . How ?

I Want To Make Something Like A Wind Mill That Light And LED On Spinning Etc Etc .

Question by EpicTrix   |  last reply

how to construct a toy car with a dc motor which can operate in a four quadrant (motoring /regenerating )??

Wat should be my motor rating ? i am using choppers to operate it ? and controlling it with PWM controller ?

Question by saleem basha   |  last reply

How to choose wire gauge for Brushless DC motor?

I'm planning to build a Brushless DC motor, with inrunner perm mag rotor and stator on the outside. How can i determine the proper copper wire gauge for the stator windings? How much current will the motor pull? At first i thought it was just "Power = Voltage * current", so knowing the power and the voltage i should be able to figure the current. However, when the motor is spinning it generates back EMF, which counters the applied voltage and diminishes the current. At no load, the motor should draw no current for an ideal motor, and only a small current in real life to overcome friction and losses. In any case it would be much lower than the nominal current. So, for instance, a 1000w motor at 50v should draw 20A nominal, but in most situations it would be less than that? How much is the starting current, when you have to overcome inertia/tire friction? I know the motor can take higher currents for small amounts of time, before it gets too hot,but how can i determine what will be the "average" current. Is there a rule of thumb that motor designers use?  Also, the amp rating for each AWG seems to vary a lot. Some places list a conservative rating that is used for home wiring. But other places list much higher currents. If the stator is on the outer side and exposed to air, how much current can the copper handle for each AWG? Any insight will be appreciated, thanks.

Question by SlickT   |  last reply

A basic (very basic) description of a Brushless DC motor.

So... before I start... I am not a physicist, nor am I an electrical engineer. Hopefully someone within one of those (or both) professions will chime in and enrich this discussion. That said... I'm going to be using leyman's terms. This thread is specifically meant to explain how a brushless DC electric motor exerts a force, and how that force is used to generate work. To start off, I'd Like to explain the components which comprise a brushless DC motor: First... You have an axil. The axil's purpose is to spin. Next you have natural magnets, or solid state magnet; I use the terms somewhat incorrectly, since a natural magnet refers specifically to nickel or ferrous base magnets, but there exist a large variety of compounds and composites that exhibit the ability to produce magnetic fields. In practice you have many in a motor, but for our purposes... we can pretend we have one. The natural magnet's job is exert a magnetic field while attached to the axil. After that we have an electrical coil. Once again, in Brushless DC motors, we have many of these, but for our purposes we'll use 3. The electrical coil's job is to produce a magnetic field which can move in a circle. Finally we have the engine housing. The purpose of the engine housing is to hold everything together. Note: I'm intentionally leaving out the computer control mechanism. there are alot of great instructables on microcontrollers. Most Brushless DC motors requrie one to work since there is no mechanical timing device, as there is in a brushed engine. So... how does this fit together? In this setup the natural magnet produces a force when next to the electrical coil (This coil is also known as an electromagnet). This is because the charge of the coil is opposite to the charge of the natural magnet. Once the Natural magnet and the electromagnetic coil align with each other, the first coil shuts off and the second turns on. Once again the natural magnet is drawn towards the magnetic pole. This process repeats until the natural magnet has spun in a circle (note: usually you want it to continue to spin beyond a single revolution.) That's the basic (very basic) idea behind a Brushless DC Motor.

Topic by Qcks   |  last reply

Old CD/DVD Drives with 2 wire DC Motors for DIY CNC

With a lot of old electronics lying around, I embarked on taking them apart  with the intention to use the sled motors to build my first CNC. Unfortunately, I found only 2 wire DC Motors with limit switches on the laser sleds.  Here is a list: 1.Sansui DVD with Sony Laser Carriage- 2 wire sled motor with Limit switch 2.DVD player from 32cm Bahun TV        -2 wire motor with limit switch 3.CD Drive from Dell Laptop                    -Miniature motor with LS & 2 track ribbon connectors. 4.Mitsumi 31/2" Diskette drive                 -Stepper with less travel The only 4 wire stepper motor was on the diskette drive. Is it possible to use the 2 wire DC motors in my project? What sort of logic control will be required. How did they function in the DC/DVD drives?

Topic by Dolon12 

DC motor with 30nm torque and more than 3000 RPM

Hi I need DC motor with 30nm torque and more than 3000 RPM how to build this or form where I can buy this in India please guide me on this also tell me what should be battery specifications to run this for 100km with the total load of 250kg?

Question by BhuvanS6   |  last reply

Electric vehicle motor selection

As any one who has looked at my instructables knows whilst a school teacher I built a full sized electric racing car.https://www.instructables.com/id/Building-an-elect...This had a 250 watt DC motor over run to 500 watts - 20 amps at 24 volts .It was capable of running the car up to 25 - 30 MPH and using 2 car batteries drive for a couple of hours on the flat.Nowadays electric vehicles are all the rage. Looking at a few motores as small as 4000 watts are in use for city use where high speed isn't necessary.Now the question:https://hobbyking.com/en_us/turnigy-c580l-580kv-br...This motor intended for model cars is rated at 4000 watts RPM 26,100 100 amps at 45 volts. that's about 5.5 Hp.Suitably gears down could such a motor be a power unit for a light weight electric vehicle.The DC motor I used was, by comparison, huge and weighty. It seems to me that HP is HP and 5.5. Hp is plenty for what I have in mind.My concerns as always is I see no other commercial manufacture doing this - or anyone else for that matter, only electric bikes use small motors.There has to be a reason I am not catching.Experts out there you opinion please.

Topic by rickharris   |  last reply

Hi experts I would like to build a cart to move items around my yard. Sort of like a four wheeled wheel barrow

I do not have a tractor but would like  it to be able to carry mulch and things.  Electric powered. i am thinking two drive wheels and two casters. If i can drive wheels independent of each other than i should be able to steer the cart. My lot is pretty flat. no more than a couple feet rise in 100 feet. No steep slopes. I thing the total weight of the cart empty will be 1200 lbs with a load of around 800 +-.  No need to be a speed machine as I will walk behind Any help would be great thanks Bill

Question by heattreat   |  last reply

E-Bike project (How to choose a suitable DC motor)

Hi Guys, I am currently doing my school project on electrical bicycle. Mind teach me how to choose a suitable e-bike motor to be used and what is the calculation that I needed. I plan to enable the e-bike to support the weight of 100kg with people riding on it.

Question by rchan10   |  last reply

is a bodine motor good for a wind generator

I am thinking about buying a bodine motor for a wind generator it has 1725 rpm and it is 90 volts. here is a link for a picture of the motor https://www.google.com/search?q=1750+rpm+bodine+motor&espv=210&es_sm=93&source=lnms&tbm=isch&sa=X&ei=PvljUuybOJSh4AP_gYGACw&ved=0CAkQ_AUoAQ&biw=1920&bih=912&dpr=1#facrc=_&imgrc=HTm_Ef2s58K5RM%3A%3BiDAIo0vFAwTJUM%3Bhttp%253A%252F%252Fi.ebayimg.com%252Ft%252FChristie-AW3-Bodine-Electric-Co-Platter-Motor-Type-42Y5BEPM-90volt-DC-1750-RPM-%252F00%252Fs%252FODU0WDEwMjQ%253D%252F%2524(KGrHqNHJFQE-lKM2UOmBP)WKvKmo!~~60_35.JPG%3Bhttp%253A%252F%252Fwww.ebay.com%252Fitm%252FChristie-AW3-Bodine-Electric-Co-Platter-Motor-Type-42Y5BEPM-90volt-DC-1750-RPM-%252F320916000400%3B300%3B250

Question by funny1048   |  last reply

Selecting DC Motor Power rating for an electrical-bike project?

I want to select a dc motor for my e bike project. I want to move a mass of 140 kg including cycle weight at top speed of 25km/h. I am confused with selecting motor specification, on Power rating. How can I calculate the required Power to drive a weight of 140kg with a speed of 25km/h. I have tried to use the formula that I found in the website ( http://www.kreuzotter.de/english/espeed.… ) . The power rating that I got is about 179W. But on reading of the articles on (investigating the human cycling performance), I found that the average people cycling power is less than 100W. I also have see the commercial e-bike specification, the commercial e-bike used 24V 250W DC motor to power their e-bike. Please help me in this matter, I am very confused with this, if there is any formula or calculation...please guide me ...I am appreciate your helps.

Question by rchan10   |  last reply

Running a car alternator with a car battery? Answered

The car alternator that i have don't have any magnets inside. it is not a universal ac/dc motor because when i hooked up car battery to it. it wont run. how does it run in the car. is there any circuit that i need to make to make the motor run here is the pictures that i took there is only a F written next to the green wire and a N on the top right of the motor just after the green wire. the white wire is very thick

Question by ARJOON   |  last reply

can i use 500 watt juicer and mixer motor for electric bicycle?

On motor specification it is written 500 watt , 50 hz ac motor , but when i plug it in 12 volt dc battery it runs slowly it can stop it with hand but i hope in higher dc volt it will run enough to use in my electric bicyle. it is philips juicer and mixer and grinder purchased from india

Question by Suraj Basnet   |  last reply

Calculate DC motor specifications (torque power etc) for electric vehicle

Dear Sir/Madam, I want to make an electric car like as shown in figure below., with a DC motor. assume no inclination, road is plain surface. please explain all calculation with formulas.THANK YOU following is the basic known parameters: Total mass of car(including rider and everything) = 250kg initial velocity of car = 0 (still car stop) max velocity = 60 km per hour time to reach max velocity = 1 minute = 60 seconds radius of tyre = 8 inch please tell me how could i find the following parameters to find accurate DC motor for my car: how to calculate force needed by my car? how to calculate torque needed by my car? how to calculate speed RPM of a motor needed by my car? how to calculate power (watt) of motor needed by my car? how to calculate battery needed by my car to travel 10 km in one charge?

Question by fawad_pappi   |  last reply

Is it possible, to supply power to dc motor using a rectified step down 220v to 110v transformer?

Hello experts, I need your help please. I have an old Dremel hobby drill. It was rated for 110v but accidentally plugged to 220v mains and blew-up its built-in rectifier and varible speed control. The motor still works. I tried it with 12v dc power supply but it rotates very slowly. If it is possible at all, how can I power it using a rectified step down 220v to 110v transformer. Thanks.?

Question by felixdjac   |  last reply

RC servo Torque Increase?

Hi; I have a DC Servo motor. I want to increase its torque. It has 12volt and max 900mamp current gives 15kgcm torque. I want to remove the tiny DC motor and fix a 5amp 12volt big motor with metal gears. I want to ask " How can I give more current without burning the main SMD circuit board". If I place a battery in parallel to the motor terminals it can burn the circuit. Any ideas ?

Question by MohitJindal   |  last reply

How do I turn the wheels of a toy car? Answered

I am trying to make a toy car using dc motors, which will also have a wired remote control. I am planning on using two motors for the forward and backward movement of the car. However. for turning the car sideways, I need a way to turn the wheels. The best way I can think of is a small rotating structure with two wheels at the base of the car, like some toy cars. Using two dc motors, I would be able to steer it left or right. However, I am looking for a more elegant solution. Can anyone help me?

Question by yagarwal2   |  last reply

can I wire 3 small 12 - 36v dc pm bl motor wind turbines output into 1

Ok...I have 3 mini wind turbines ..2 are 12 v dc and 1 is 36v dc they definately put outa shock when spun by hand! so what I want to do is combine the power outputs of these 3 motors into in one 48v  +supply A.do I wire them in series with diodes between..or in parrallel?..I hear both ways, but that cant be or do I wire them all (with diodes) to a "single" connection  (1 for + and 1 for -) B. what size/ type of diodes should i use on each motor (preventing back powering the motors) ulitimately I want to invert this power into 110 ac  but with decent watts any insight or help is greatly appreciated!!

Question by schel   |  last reply

Where to find a 2 HP Electric Motor?

I am looking to build a belt grinder.  Anyone know where I could salvage a 2 HP Electric Motor?  I initially thought treadmill as you can get them next to nothing on kijiji but depending on if its AC or DC I guess you need a bunch of other things to go along with it.

Question by newfiebackflip   |  last reply

Project ideas help?

I have an 28v dc motor that i want to do something with. Does anyone have any ideas? It's a pretty big motor (weighs about a pound), I was thinking about making some kind of tool with it.  Any ideas would be appreciated. Thanks

Question by musick_08   |  last reply

24 Volt AC volt to 12 volt dc?

Hi guys i have a 24volt ac motor and want to reduce it to 12v dc. I have worked out how to change it to dc but not how to reduce the voltage. Is this easy to do or do i need to purchase something from the electronics store. any advice would be appreciated sam301

Question by sam301   |  last reply

Making a large electric motor from scratch

I searched the archived threads and found quite a bit alreadydiscussed here about making very simple and small electric motors fromscratch. What I want to do is to make a fairly large and powerful one(say, somewhere around the size of a coffee can). This is for asculpture project, and the motor will be driving a kinetic mechanism.I'm pretty handy, have a extensive range of tools and am comfortableworking with high voltage. What I am not, however, is knowledgeableabout designing or making electric motors; hence my questions.I understand that I'll need to wind armatures and so forth, but Idon't know what the advantages/disadvantages would be of making a DCversus an AC motor (either power could be supplied), nor do I reallyunderstand the differences between the various types of those two. Themotor needs to be able to start by itself under load (as opposed tosome homemade electric motors that seem to need a nudge to get going).Simplicity, low maintenance and ease of construction would be a plus.I had thought of making a homopolar motor such as they have at theExploratorium (http://www.exploratorium.edu/cmp/exnet/exhibits/group5/daisy/index.html) but it seems that homopolar motors like this cause considerable wearto the part that acts as a brush, which will work against my goal oflow maintenance. Unless...perhaps I could use a rolling conductor (like a precision bearing) as a brush? Does that make any sense?Thanks for any advice!

Topic by Bricology   |  last reply

How to make a fast speed clock?

I'm trying to make a clock which its hands move fast, as fast as around 30rpm. Preferably it will cycle like a regular clock, just sped up. Should I attach a motor to the set hand dial on the back? The motor I have at the moment is a DC motor 12v 36rpm except it is really noisy and it needs to be powered by batteries, and I don't think it will last for the length of time I need it to, around 2-3 hours of continuous rotation.  How do I attach it so the motor controls the dial? Do I need to use gears? I'm after the simplest, most efficient solution, please help me!

Question by theclash77   |  last reply

is there any ways i can powered my 120-220 volt ac motor from 24 volt battery in a cheap way? Answered

Here in my country i cant find any DC motor so i wanna try AC motor for my electric car

Question by Suraj Basnet   |  last reply