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Electric motor

What would cause an electric motor, running a table saw, to suddenly start running at a faster speed than normal?

Topic by tablesawguy    |  last reply

electric motors

I am considering motorizing my bike for my work commute. However I don't have enough knowledge about motor output as in torque / rpms to be able to determine what kind of characteristic I should be looking for. For many of the electric motors I am finding online, it doesn't really say the torque output. Is there a spec such as watts that I can judge a motor by? What specs should I be looking for in a motor that can assist in moving my weight. Or an links to good knowledge sites would be great too. Thanks.

Topic by aeneas shrike    |  last reply

Electric Motors?

Can a 3/4 HP electric motor ( from an old garage door opener ) have enough power to be put in a bike and get at least 10 MPH out of it. Also what batteries should i use, i think i have an 18v or 16v battery somewhere..

Topic by Katarukito    |  last reply

seized electric motor

I'm trying to fix a dishwasher. The pump motor seems to be seized. It doesn't __feel___ that stuck, and has spun for me 1 out of 5 times. Any ideas on how to fix it?

Topic by Toga_Dan    |  last reply

Electric motor specs? Answered

I have the disc motor out of a Polaroid portable DVD player, and would like to use in one of my projects. However, it doesn't have an indication of what power it needs on it. There is a serial number or item code on the side, but no manufacturer to check for a data sheet, and Googling  the code (TM2458 on the top line, GG54 on the bottom line) yields no results. I need enough information to power the motor using either a battery or Arduino. Please help?

Question by Levitationist7    |  last reply

electric bicycle motor?

Okay, Im thinking of turning my bicycle (a "Quasar Bounty") into an electric bike.  it already weighs about 30-40 lbs. And I want it to go at least 30mph. Can someone please suggest a motor I can use, and what battery I should use? Thanks, Michael McPherson (mmcpherson4)

Question by mmcpherson4    |  last reply

Electric Hub Motor

I have 48V 6AH Battery and 350W Hub Motor with controller for Fat tyre CycleIm getting a speed of 40.Hence want to know to increase speed upto 55 or 60

Question by DattatrayaM    |  last reply


Anyone out there no a way you can convert a 0.5HP electric single speed motor to a variable speed motor (if it can be done)

Topic by splott    |  last reply


Ok so i have a little problem here... i want to make a little electric motor go forward and backward by pressing a single button for each move (so 2 button in total) i got a little image ( poor quality i know but youl get the point) of what i did but its doesnt work :/ thx

Topic by koax    |  last reply

Inchworm Motor?

Is it possible to build an inchworm motor? Or does such a thing exist where i could hold it in my hands?

Question by lutziepv08    |  last reply

electric bike

I am working on a motor bike that i had originally decided to go gas with but the motor dosent work anymore so i changed my mind and went electric. i was wondering if i would still need a jackshaft with an electric motor. it is a 24 volt motor out of  a powerchair.  i don't know specifics on tourque and hp, but it's pretty powerfull, and turns quite a few rpms. any help would be appreciated. thanks.

Topic by the mechanical engineer  

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

Brushless Motors

I have a few fans around from computers. Seems that 3 wires is pretty common for these. I wasn't sure which was what, so, I figured "nothin to lose" and hooked up the right voltage across 2 wires. My guess was right. It ran. But, having 1 out of 9 fanblades busted off, it shook a bit. So, I busted off 2 more blades to balance it. But now, even connecting it the same way, it doesn't run. So, how should a 3 wire brushless motor fan be wired?

Topic by Toga_Dan    |  last reply

electric bicycle

Ok, i wanna take a old bike and put an electric motor on it, with a solar charged battery. what i wanna know is, what are my options on motors if i wanna use recycled components? can i use a motor from a; washer, dryer, blower fan, ect? i would like to be able to have something i can get around town with(not assisted)

Topic by golddigger1559    |  last reply

Electric scooter?

Has anybody made a electric scooter that is ran off of a drill motor that takes 7.2v?????

Question by TSC    |  last reply

100 hp electric motor

Is it possible to make a 100hp electric ac motor? I have a workshop so all tools are available. Using ndfeb magnets or electromagnets which are efficient for this electric motor any one know about this plz help even small help is admirable .....................

Topic by kacarot    |  last reply

Slowing down an electric motor? Answered

I am on radio shacks website looking at a 1.5-3VCD hobby motor.   The specs say up to 8,300 RPM at no load.   If I added resistors to this, would it slow it down?  I want it very slow, like 1 rotation every 3 seconds. lol   Thanks

Question by pennsteve    |  last reply

Slowing down an electric motor?

I am working on getting all the supplies together for my first instructable.  The item I am building (not giving out many details) will have 5 different motors on it.  I think all motors will be the same model.  However I want one motor to run quite slower.  Can I do this without having to run it off a lower voltage power supply.  Now that I think of it I suppose there is plenty of room in my item for a 2nd power supply.  But this will still be good information for me to have in the future.  Oh and the main power supply for the item will be either 3 - 6 volts I believe.  AA batteries in case this matters at all.  Thank you in advance for your help in this matter.

Topic by jcaresheets    |  last reply

FS: BIG electric motors

've got three 36v forklift steering motors. They're big, beefy, and used. Rated as 1 1/3 HP "special" duty. They draw 4.1A no load at 36v. With the gearbox, they draw 4.3A no load. Speed for the motor alone 3225RPM , with the gearbox is 75RPM. Torque must be something outrageous. They have an optional mating 43:1 Sumitomo-made gearbox which I reckon would make these some great drive motors for a large heavy project. Without gearbox, they would be excellent for go-karts, suicidal ebikes, etc. I even know of a e-car project that used a similar motor. (forkenswift) The motors alone weigh about 18lbs. Not sure what they weigh with the gearbox. You want one. I have three. I'm asking $100 each for the whole motor/gearbox shebang. Pictures:

Topic by nedfunnell    |  last reply

Increase the speed of an electric motor? Answered

My electric bike, seen here, was built for my senior project. I was limited on motor choice, and had to go with the best I had, an old powerchair motor. After 2 successfull attempts at building an electric bike, I have discovered that it is impossible to go faster that 25 mph with with one of these motors. As you can see on my instructable the bike has 6 speeds, with a top speed of 20mph in first gear. however, when I shift gears, the motor rpm's decrease instead of the speed increasing. I have heard before that it is possible to run an electric motor at higher voltages than it is rated, so I was wondering, if i could add a seperate switch and a "booster battery" of sorts, that as long as I monitered the voltage so as to not let exceed 24 volts, if this would be feasible. My only other option would be to add a second motor in parallel with the first, and on the same drive belt. The first option would be the easiest, if it could work without damaging the motor. Any help would be appreciated. Thanks, iloveairsoftstuff

Question by the mechanical engineer    |  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

would this motor produce electricity? Answered

I made a bike generator and I want to add a brushless motor to it so I wont need to replace it or the brushes. I am looking at the brushless motor at this link.

Question by TOCO    |  last reply

Electric bike motor help!

Helli guys.. after a long time racing motocross, I would like to experiment into doing an electric dirt bike for myself.. My plan is to find an 85 or 125cc frame with no engine, and build from that.. the biggest question is, what motor could I use that is no less than 15kw, and on the affordable side? I was looking at the Turnigy Rotomax 150cc eqiv. And it has a max power output at 9000 something watts, would that be any good for a motocross bike? Would it burn out quickly since its pretty small? Notes: i am strictly looking for powerful bikes, a 2kw bike is not for me since I am used to overpowered 250cc two stroke hell-born suicide machines, thanks..

Topic by dsirotic    |  last reply

Electric motor running backwards

I have an electric motor on a large Hobart vertical mixer 80 quart.I had the brushes replaced and put it back together It now runs in reverseIt is a single phase motor with four brushes that have no power to them there is no capacitor eitherIt is an old style motorAny help would be greatly appreciated even what type of motor this isThanks David

Question by David Ferguson    |  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. 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: 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

Cordless electric drill motor.? Answered

I have been experimenting with an old motor from a cordless drill no markings on it - Any one have any power information for these motors - they seem to produce a LOT of torque for such a small motor.? I find I can lift 4 Kg fairly easily - I guess I could do it the old way and measure and calculate HP.

Question by rickharris    |  last reply

Motorized/electric vertical blinds?

I have some vertical blinds in my living room that are manually driven via a cord to tilt the blinds and another cord to open or close the blinds. I wonder is there a conversion kit to open/close and tilt them electronically via a remote control? I have found some kits from hundreds of dollars to thousands, but know I could find one or build one for way less. Any thoughts or ideas?

Topic by flaresider80    |  last reply

electric car

Ok i want to build an electric hybrid system my first question is ac or dc power. i want to build a paralleled drive system. that uses the stock motor to drive on the highway with maybe a little help from the electric motors. here are my thoughts start with a f250 powerstroke diesel crew cab truck, install a divorced t case and new drive shaft, hook the electric motor to the t case front axle output. the goal is to use the space by the tool boxes to fit the batteries and later update the alternator. the goal here is a hybrid that can still haul what a normal truck can but run purely on electricity when in town

Topic by dkeller8    |  last reply

Electric mower

I want to convert my old gas mower to an electric mower. 12v batteries are easy enough, and there is plenty of info re solar charging systems. I'm stuck on sourcing the motor. I was wondering if a car starter motor would be sufficient for running a lawnmower? It's a 12v motor, has enough oomph to turn over up to 12 cylinders of american steel, and there are plenty of 'em out there in junkyards waiting to be recycled. Sounds good on paper. Anyone have any insight into why this is or ain't a good idea? Thx- Rev. Bucky

Topic by RevBucky    |  last reply

Electric bike generator?

I have an electric bike that has a 24 volt 450 watt motor, running on the back wheel.  would it be possible to fit a front hub motor  on the front wheel to ether help with charging the battery's while using the electric motor to run the bike or be able to power the motor when you have started to move.  If this is possible what size hub motor would I need in the front wheel and what modification would I have to make.

Question by AlanV23    |  last reply

controlling speed of dc motor Answered

Hey guys I'm trying to finish a project.  I have a motor thats making a 5 gal bucket spin, I would REALLY like to be able to control the speed but I'm not sure how to go about it.  Right now it's spinning extremly fast and to unstable The motor I used is decently small I've read similar problems and ppl suggest PWM what size do I need for the motor I have?

Question by micha3l87    |  last reply

Speed control for AC electrical motors

I want to use a GE A-C motor (5KC33GG101): Connection Type and Voltage Rating in Volts: 115.0 line to neutral single input Rotor Speed Rating in Rpm: 1725.0 single full load Frequency in Hertz: 60.0 input to run a 50' line on pulleys for a Halloween project but it's too fast. Can anybody help me figure out if I can buy/build a controller to run it slower?

Topic by mario-alonzo    |  last reply

10 hp electric start motor

I just purchaced a 10hp briggs 4cyl electric start go kart motor and im needing help figuring out how to rewire the switch. (wires were cut) anybody know where i can find a wiring diagram for it or an instructable on wiring it? any help is appreciated thanks.

Topic by kdf.inc1969    |  last reply

Which electric motor for which project?

OK, so I got two projects for this winter. One - building a lathe for woodturning. Not a mini-lathe, but a bit more serious piece of equipment that I could use for some furniture details. Two - apple mill for cider. And I have two salvaged electric motors laying around. One is from an old Remington chainsaw, 1400 W and probably some quite serious speed. The other one is from a pump, actually water automate that sat on my 15-meter borewell. Do not have the data, but most probably slower (and it is way bigger). Problem is, I have zero experience with such stuff. For setting up the electricity side I will probably call in the cavalry, but first i need to decide, which motor I will use for which purpose. So, any advice, gurus?

Topic by wahur    |  last reply

Remote controlled outboard electric motor

Hi, I would like to build a remote system for an electric outboard motor. It could be controlled with a wired remote or not. I would really like to make it so that i can just "clip in" my existing Minnkota transom motor and control speed and direction. I have some electrical skills but really need ideas about gears, controls and suggestions. Any interrested?

Question by Traggart    |  last reply

speed control for A-C electric motor

I want to use a GE A-C motor (5KC33GG101): Connection Type and Voltage Rating in Volts: 115.0 line to neutral single input Rotor Speed Rating in Rpm: 1725.0 single full load Frequency in Hertz: 60.0 input to run a 50' line on pulleys for a Halloween project but it's too fast. Can anybody help me figure out if I can buy/build a controller to run it slower? Thanks in advance!

Topic by mario-alonzo    |  last reply

Electric bike from spare motors

Hi Everyone, my first post here.  I've been thinking of making an electric bike. Now there are bikes on the market that are $450+ and I have a spare one that I haven't touched in over 6 years lying around. With the recent improvements in DC electric motors, I think it's about time I gave it a shot at assembling an electric bike. The motor will likely come from an electric lawn mower, the battery will be a lithium ion battery rated for that motor (I can attach these into series or parallel depending on what motor I use). I've been looking at electric motors from (I'm australian)  Either one of these or The cheaper one more likely. If I should source a motor another way then I'm all ears.  My questions are: Would the motors in the first link be powerful enough (they use the same battery as an electric drill) How would I attach the motor to the bike so that I can ride and engage the engine when I want? How would I mount it so that I can use regenerative braking? I was thinking of using a clutch sort of mechanism attached to the wheel axle, again I'm all ears. And if anyone's done this already, what type of hazards am I going to face? (that probably aren't obvious, safety first!) I also thought of using a petrol engine from a lawn mower but an electric bike seems more appealing to me. :) Thanks all

Topic by majuules  

Websites selling small electric motors?

I am starting an electric go-cart(ish) project thing, and was wondering where I might find the best site for moderately cheap and decent electric motors? (Looking for a motor in the 250-500 watt range) I will be making my own drive train,gear reduction etc, all I need is the bare motor. Does anyone have any suggestions?

Question by NoNameCola    |  last reply

Do brushless motors produce electricity?

 I built a bike generator. My science teacher recommended installing a brushless motor instead of my brushed one. 

Question by TOCO    |  last reply

Help figuring out electric motors

I'm trying to decipher the mystical language of electric motors and need some help. I was at one of my favorite stores yesterday, a place called 'Industrial Liquidators' here in San Diego, and I was looking at their vast supply of electric motors. Big ones, small ones, battery operated ones, flat one, all in latest styles and fashionable colors. I know of plenty of uses for these things but I have no idea what it is I'm looking at. I would like to make my own rock polishing tumbler, so I'd like a motor with a bit or power and a slow rotation, but how can I figure out how strong and fast a motor is?Maybe I'm starting at the wrong place. I must admit that I know next to nothing about electrical stuff. Pretty much the only thing I know about electrical equipment is that it only works when you plug it into a socket.So that being what it is, can anyone direct me to a website that explains how to read these motor labels? Ya know the ones that say how many ohms, volts, amps etc.Thanks for any help.

Topic by astro347    |  last reply

Would this brushless motor produce electricity? Answered

 I made a bike generator but the brushes went out. Would this motor produce electricity? I will put it in some sort of protective housing. So here is the link.

Question by TOCO    |  last reply

Washing machine motor on an electric vehicle?

Hello, i already asked a question about a car starter as a Motor for my Electric bike project. I got bad news from the answers, so I wanna use a washing machine motor.  My question is, do i need 240V to power it? Or it has like a transformator in the washing machine that makes the voltage lower? I never opened one..

Question by dsirotic    |  last reply

Self-Reversing Electric Servo Motor?

Is there a circuit that can change the rotation direction of an electric motor that's cheaply and easily?

Topic by lupinesoul    |  last reply

Speed Control for AC Electric Motors

Can anybody tell me how to build a controller to adjust the speed of an 110VAC electric motor, ( ex: blower motor, fan motor ) I was cautioned about using a light dimmer. bill

Topic by broham    |  last reply

12v Electric Motor Speed Control?

I have a 12v electric motor I was given from a camper water pump (at work currently so I don't have any of the specs). I also have a power supply from an LED lighting kit to take the power from a wall plug down to the 12v for the motor. Connecting them directly works fine, but I am trying to make an electric leather burnisher and would like to have a bit of control over the speed of the motor. I have a small 25 ohm rheostat I wired in, and it worked perfectly, but the rheostat began to overheat with in a few minutes. What type of controller would I need to look for? Just not sure where to look when it comes to items like that.

Question by dbgrigg189    |  last reply

How to program a small electric motor? Answered

I want to start a small simple vending machine project, yet its not clear to me how can i program a small motor to respond in a certain way when the relevant events are triggered, i mean what are the hardware necessary for me to be able to comunicate with the actuator (the motor), and which type of motors are best suitable for such projects? Thnx!

Question by Sanousi    |  last reply

Electrical requirements of a DVD drive motor? Answered

I've just ripped up an old DVD drive to re-use the motors in a basic BEAM/Solarbot. Its clearly marked with the polarity but I'm unsure of its electrical needs - will I need to use a certain spec'd solar panel/capacitor to supply its power needs? Or will it simply work with whatever I supply it (lower torque/power aside)? I'm short on electrical know how and looking to build both theory and practical knowledge tinkering around. I've seen a number of kits that have solar cells that supply 4.5V / 18mA - but assume this would be more applicable to how fast the capacitor is charged.

Question by cloudy-wind    |  last reply

Help with electric wheelchair motor-controller?

I recently bought an old Invacare wheelchair to use the motors and controller to integrate with a computer. However, the "MKIV INT" (i'm assuming that's the manufacturer) motor-controller is an all-in-one with the joystick in it. I removed the joystick, hoping I could connect to a DAC and my computer via parallel port, but the joystick has a small circuit inside of it. I'm assuming the circuit gets 5V from the controller and sends pulses of the analog joystick position. I was thinking about de-soldering the 4 wires from the joystick (2 wires for x-position and 2-wires for y-position) and first try to replace the joystick with an old PC-joystick--just to see if the controller detects different resistances of a different joystick, etc...

Topic by ferris_beuller    |  last reply

Question about electric motor ratings

So, lucky me, I curb surfed a table saw last friday, I was going to part it, but my wonderful wife suggested that I could benefit from an extra saw. So deciding to fix it up, I looked over the motor rating, and was left with a question. The motor is rated at 1&1/2 Hp 110v 18 amps. So my question, When is it 18 amps? Start up? Running? Stall? I ask because my breakers are 20 amp, kinda close there for comfort, and no re wiring for 220 right now is not an option.

Topic by Tool Using Animal    |  last reply