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DC motor

I had a 220v angle grinder. It was burnt. I take the rotor of the grinder out. Its completely fine. Now i make a DC motor using this rotor and magnets(for field current). My question is, how much maximum DC volts this motor can take to get the maximum RPM. Because the motor was 220v AC, Will it run on 220v DC?

Question by Shezi007    |  last reply

dc motors

Hi: Can anyone tell me why my 24volt dc motor which I just got rebuilt will only work on 12 volts and immediatly overheats and stops with 24 volts? Thanks, Royal

Topic by cra    |  last reply

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


I'am making a car that should carry 50 kg and move at a speed of 10 km/hr. Can anyone help me in choosing the right DC motor??

Topic by Masked_r    |  last reply

DC motors & stepper motors

I have 13 stepper motors and 10 dc motors for sell. I just have way too many laying around. I would like to sell them all for 40 dollars shipped using paypal. I'm hopping to sell them to help fund my CNC project. I also might be adding more motor as I find them.

Topic by r1dd1ck913    |  last reply

DC motor regulation

I am planning to build a small gearbox that depends on a steady rpm from a 3V dc motor. I understand that the output rpms will change in correlation to the fluctuation of input power. My question is, if I used a regulator to regulate the input voltage from 5V to 3V, will that keep the motor rpms steady?

Topic by Tman179    |  last reply


RELATED TO DC MOTOR CONTROLLER (EV VEHICLES) 1: Need for large number of capacitors in the power circuit (store the charge and dissipate to which part of the component mosfet or diodes ??) ? 2: what are diodes parallel to the mosfets for ? ( other than preventing the back emf coming from the motor ) and is it have anything to do with firing angle ? 3:advantage of using many mosfets in parallel than using a single mosfet and on what basis must that mosfet chosen? I am from India a college student pursuing my electronics engineering and making motor controller,i am able to get all the circuit details and how the motor controller works but i have above few doubts

Topic by doraditya    |  last reply

Large DC motor

I'm looking for a relatively cheap motor that would be large enough to spin around a nerf Vulcan. I don't know much about what kinds of motors would be good, or where I could get them. From what I've found, they're not that common and they're super expensive. Does anyone know where I could get one for under 100 dollars? It doesn't need to be fast. Thank you in advance for your help.

Topic by alecnotalex    |  last reply

WANTED: DC motor

I'm trying to build a wind turbine. If anybody has a DC motor from a old treadmill, electric scooter, etc. I would love to have it. The idea motor would be one with highest volts per rpm. That means low rpms and high volts. Let me know if you have something.

Topic by JSTArollin  

DC Motor Problem?

Hi , to whoever is reading this .I wired 2  3v dc toy motors in series and I used about 4.5v as the power source. As I powered it up one motor spun fast and the other spun slower , so I thought the one running slower was defective an so I bought another motor and wired it in series with the  that was spinning fast and thought their speeds would be equalled, however the new one I bought started running faster and the old I one I had that spun faster began spinning slower than the new one. I tried the new one with the old one that had been spinning slower and arrived at the same result.. Could this be because I wired the motors in series ? I  Really need help s o please help me and thank you in advance and for taking the time the read this.

Question by Strontium    |  last reply

PIR DC Motor? Answered

Hi all, I am trying to set up a dc motor controlled by a PIR sensor using an arduino.  When the PIR sensor is triggered, I would like the motor to turn on for half a second and then off.  However, no matter what "delay" I write into the sketch, the motor always stays on for around four seconds.  Could someone please help me? The sketch I have written is below and have provided a picture of my set-up: const int pirPower = 12; const int pirIn = 13; int motorPin1 = 3; void setup(){ pinMode(pirPower, OUTPUT); pinMode(pirIn, INPUT); pinMode(motorPin1, OUTPUT); digitalWrite(motorPin1, LOW); digitalWrite(pirPower, HIGH); } void loop(){   int value= digitalRead(pirIn);     if (value == HIGH){       digitalWrite(motorPin1, HIGH);       delay(2000); //will not start if = 0-20.  The signal is stronger the higher the delay goes.  Time active remains the same.       digitalWrite(motorPin1, LOW);     } }

Question by Josh_Lucas    |  last reply

Stepper Motor as a 'normal' motor

Hi, I recntly took apart a hard drive and there is a 7200 rpm motor inside. Only problem is that it is a stepper motor and I don't have any equipment to drive stepper motors and buying stuff to do is err... cost prohobititve.  Would connecting a negitive wire to 2 of the terminals and positive(in sort of a crisscross pattern e.g. -+-+) to the other make it run like a regular motor? I just don't want to invest time  to solder it only to have it not work.

Topic by ChickBang    |  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

Motor Controller

Dear Sir, Can you help me in developing a 24/36 mosfet controller for tricycle? Regards P​

Topic by hgsan    |  last reply

DC Motor- dead or alive?

I've got a DC motor from a treadmill that when I spin it generates a small voltage then drops off to zero even as the motor continues to spin. Is it shot? Can it be repaired, if so, at what cost.?

Question by haroun    |  last reply

DC Motor Control Help?

A very long story short, I desperately need assistance in knowledge with some motor control. I need to control 2,DC 6v motors with encoders that include 6-pin 2.0mm pitch PH JST cables that break out motor inputs. The bottom line would be what do I need to control these motors, to go forward and reverse, and operate it from a wireless controller? I appreciate any and all help! Also, this is our motor:

Question by NickWeav    |  last reply

spec a dc motor for a vehicle

I am making an electric vehicle. Assume no friction on a flat surface. The vehicle will have two dc electric motors preferably 24v or 48v system as space is an issue(about 3.5 x 4 feet) one motor on each drive axle. The vehicle will weigh 2000lbs have a max speed of 10miles per hour be able to reach max speed in under 5 seconds overall wheel diameter will be 16 inches Can be geared down to attain needed torque but must go up to 10miles per hour. Please include formulas so I can at least know how to do this in the future. I need to know power, torque, rpm needed for electric motor. Thank you

Topic by tshaf    |  last reply

DC motor speed controling Answered

HI! I'm trying to mod my Tascam cassette recorder. I want to be able control speed of the motor. So I bought on ebay PWM controller and after installation thing don't run so smooth as I wish. the problem is ... when pot is all the way down at 7 clock motor is off, when I turn it to 8 a clock motor starts spinning and reaches its full speed at 9 a clock. and from 9 a clock to 4 there is no effect on speed. Please help me! .... my electronic skills are too weak to understand this. p.s it is 12v dc motor and there is link for the pwm I use.;=STRK%3AMEBIDX%3AIT Thanks

Question by AndrisT1    |  last reply

DC-motor, Encoder wires?

Can any one help me to distinguish between the wires of the encoder in this motor below?

Question by Abd Errahmane GU    |  last reply

12v dc motor selection Answered

I have made chassis for my robot which is around 15-20kg.which motor would suitable for it?

Question by amey123    |  last reply

How to run a DC motor? Answered

I had a motor with four pins i dont know how to wire the motor to run.Can anyone tell me how to run that?  

Question by Rajkumar2506    |  last reply

Potentiometre for 3v DC Motors? Answered

Hey Guys, Today I Need help selecting a potentionmeter for my 3v dc batteries, The setup will be like this, There will be 4 3v dc motors in parelllel drawing about 800 mah i think with a 6v 2 amp 4 aa cell battery pack. I want it to be so that when i turn the potentiometer to the lowest the motor goes to the slowest speed (or close) and when i do it the other way it goes to the highest speed (at 6v). Thanks in advance. -Prickly Potato

Question by SA-DIY    |  last reply

Slow down a DC motor?

Here is another basic electronics question for all of you: What is the easiest way to slow down the RPM of a small DC motor? Much appreciated!

Question by brandegor    |  last reply

Limiting power to dc motors

I have 2 dc motors that i will control using an arduino using pwm, my input voltage is 9.6 volts from a battery, but i will use a 5v voltage regulator to power the arduino, the motors are 3v motors. How would i limit the voltage to them using resistors, i have two motors here are their specs Typical operating voltage:  3 V Free-run motor shaft speed @ 3V:  12300 rpm Free-run current @ 3V:  150 mA Stall current @ 3V:  2100 mA Motor shaft stall torque @ 3V:  0.5 oz·in

Topic by tgorbunov  

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

DC motors as generators in parallel?

Hey guys, im doin a project, ill be using two cordless drill motors with a maximum output of 12v each and unknown amp atm. My question is this: Both the outputs of those two motors will equal 24 volts, but I want 12 volts and increased amperage - this will, for the most part, be used to charge a 12 volt lead acid battery and I dont require the safety police on this one. So, can I take both outputs of the dc motors and wire them in parallel and have a resultant potental 12v maximum? Or will I have to use electrickery?? I have only a novice/intermediate skill in electronics and my parts come from re-using old scrap technology. tx, Sky

Topic by Sky Graham    |  last reply

Needed DC motor strength? Answered

So me and a pal are looking at building an electric racer, and wonderd, if two 36V 850W were enough? its gonna carry one person, the motors, 3 12V lead-acid and the frame of the car (made out of less than 12meters of 30/30/3mm steel) thanks :)

Question by dumle29    |  last reply

DC motor speed controling

HI!  I'm trying to mod my Tascam cassette recorder. I want to be able control speed of the motor. So I bought on ebay PWM controller and after installation thing don't run so smooth as I wish. the problem is ... when pot is all the way down at 7 clock motor is off, when I turn it to 8 a clock motor starts spinning and reaches its full speed at 9 a clock. and from 9 a clock to 4 there is no effect on speed. Please help me! .... my electronic skills are too weak to understand this. p.s  it is 12v dc motor and there is link for the pwm I use.;=STRK%3AMEBIDX%3AIT Thanks    

Topic by AndrisT1    |  last reply

How to size a DC motor? Answered

I want to rotate a stainless steel shaft that is in a vertical position having a 40 mm diameter and 300 mm length. The motor will be attached to the bottom of the shaft, so when the motor is turned, the said shaft will rotate. The shaft is not driving anything, it just turns on its own. The shaft's mass is 3kg(according to my calculations).  I want the shaft to rotate at an angular speed of 45 degrees per second. Having this information, how can i size the motor that will do the job. What kind of torque would i need, what kind of wattage. Please show me some calculations so I can know how motor sizing is correctly done.  Very much appreciated, Chris

Question by Chris414    |  last reply

Treadmill DC Motor Control

Hi all,I have been given a treadmill motor by a friend, sadly none of the control boards have come with it, just the motor and a transformer bolted to the same bracket.I'm hoping someone can tell me the best way for a layman to hook this up for variable speed, as I would like to improve on my 1/4hp single phase motor currently attached to my lathe.I don't know much about the motor and could not find a datasheet, but a pic is attached.Is there any plug and play options that don't cost the earth, ideally i would like to be able to plug it into the mains (UK) and just control with a pot.As always thanks in advance, you guys make this place a great resource for us noobs.

Topic by Squibo    |  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

Suitable DC Motor For Project

I am going to make a smart assistant that requires to carry 60 kg load and above with the minimum speed of 0.2 m/s. I am planning to use 4 DC Motor. How can I know on how to choose the most suitable DC motor?

Question by Aida SurianaY  

DC Motor Air Pump

Hello Folks! How are you? I need a air pump for my aquarium and I have tons of DC motors, I was thinking of buying one, but they are so noisy and its so much cooler to use old parts to build something. I found some projects here for water pumps using DC motors, but what I want is to build a system, using a DC motor that brings air from the outside through a small hose into my recipient, in this case my aquarium. Have you guys/gals ever heard of something like that? is it possible?

Topic by kreoo    |  last reply

Help please: dc motor

Ok so im wanting to build a remote control pan/tilt head for a relatively large camera (canon XL2). I've started off using a few 12 volt motors that came from a car window opener, but i've found these motors to be rather loud and bulky. Does anyone know where i might find some dc motors that are quiet and small but can still be able to pan/tilt 8 pounds of camera?

Topic by fro fro    |  last reply

DC P.M. motor help

Went to the scrapyard and pulled out the motor that runs a treadmill... thinking the treadmill plugs into the wall I thought the motor was going to be AC...WRONG, it a DC P.M. I want to build a home made disc sander and was wondering if it possible to make this motor run from the wall outlet? There was a small circuit board next to the motor but I didnt grab it since I had disconnected all the wires from it. BTW, Im completely clueless to electrical stuff so be gentle with me. Dask

Topic by dask13    |  last reply

Running DC motor underwater? Answered

I have heard that DC motors can run underwater and am trying to build a project with them running underwater. I recently tried running a brush less DC cooling fan underwater and it broke. Meanwhile I tried another mini DC motor, the kind that cost $.99 each and it worked fine. Does anyone have any ideas why one worked and the other did not? Does it have to do with being brushed or not? Lastly would something like theoretically run underwater? Thanks.

Question by Hammock Boy    |  last reply

DC Motor Burning Issues? Answered

I connected 6 Volt 4.5 AH Battery to a motor directly and that burning electronic smell came. Should i limit the current? If so, Then how?

Question by yhdesai    |  last reply

dc motor speed control

I need help regulating the speed of a simple dc hobby motor. i understand that i should be able to do this with a variable resistor/potentiometer but while it does work, it only does so when the wiper gets really close to one end. how do i even it out? i also must admit i don't understand complex electronics and wish to find a simple solution. any help is much appreciated.

Topic by synthetic_iron_oxide    |  last reply

Adjustment of the speed of a DC motor Answered

I'm working on something that requires a very low speed motor (~.5-4 RPM). I found a motor that runs at 1.5v @ a maximum of 7rpm (5040RPM max with 1428:1 ratio) I need however, something to lower and raise the speed of this motor. I know that people say PWMs for this, but the only one I can find is a 12 volt and has gotten mediocre reviews. Could I use this 12 volt PWM in this system, or could someone point me to a reasonable PWM that would work?

Question by sblaptopman    |  last reply

dc- motor ultracapacitive skateboard

Need help in this project as I am abit lost with the programming of my project. My skateboard will be able to charge by manual moving and then discharge to electrically move the skateboard when needed. Im using an arduino board and I need to program a H-bridge with pwm and controlling the motor speed. Hope somebody can help me out asap. Thanks!!

Topic by Nicktyw  

Calculating my DC motor

I'm not sure on how to calculate the things I need. Please help!!!!Pulley Radius- 5.85mmMass(load)- 0.2334 kgVolts- 9VCurrent- 0.096ASpeed-112.4rpmForce-?Torque-? Power-?Power Out -?Efficiency- ?

Topic by hj212121    |  last reply

Variable Speed on a DC motor

Hi everyone, Does anyone have any suggestions on how I can slow down the roatational speed of a 14.4V DC motor? Its come out of a cordless drill and I have another project to put it to use but it rotates too fast at the moment. I have 2 options: 1) Use a variable resistor to slow down the speed 2) Use a gearing system In an ideal world I would prefer to use the variable resistor, as then I could change the speed of the motor quickly and effortlessly. Mechanical circuits are not my best skill and Ive already burnt out a cheap potentiometer (presumably too much current?) so I need to think more inteligently about what the design should be rather than just bolting components on the side of it. If anyone has any ideas please feel free, im open to all suggestions at the moment. Thanks Mat.

Topic by mathewjenkinson    |  last reply

DC Motor speed controler

Hi all Can anyone suggest the best way to replace the variable speed trigger of a 18v battery drill, with a remote from the drill adjustable speed control. I want to control the speed and have it stay at the setting until I turn it off or adjust the speed. The drill will be clamped to a board with no battery and powered by a power supply. Thanks for any advice Les

Topic by Les1951    |  last reply

Does a 12V DC motor output DC current? ?

I am doing a science fair project that involves a solar panel, connected to a charge controller, connected to a 12V battery, connected to a switch system that can either go to a flywheel with a 12V DC motor or straight to a DC to AC inverter which leads to light standard light bulbs. The system worked (light bulbs lit) when I connected the panel to the controller to the battery to the inverter. However, when I had the battery power the flywheel and then have the flywheel output its energy to the inverter, the inverter shut down and would not work (red alarm went off). The flywheel is producing more than 10V (starts at about 11V) for at least 30 seconds, and the inverter's low voltage shut down in 10.5 plus or minus 5 volts. So why doesn't it work? Is the inverter messed up or is the flywheel outputing AC power? Also, when I connected the solar panel to the charge controller to the flywheel, the charge controller completely shut off. Are charge controllers not able to be directly linked to motors? And if I tried to directly connect the solar panel (which has 20V) to the flywheel (with a 12V motor), without a charge controller in between, what would happen?

Question by valmic    |  last reply

Sensitive Motor?

Im looking for a small, no bigger than half a roll of quarters, dc motor that can be programmed to spin 50ths of a turn. it needs to have some power and not be super expensive, thanks for the help.

Question by theboygenius    |  last reply

Is there a way to convert a hobby DC motor into a servo motor?

is there any instructions to build a servo motor woth a DC motor.?

Question by mzee233    |  last reply

Need advice converting an AC motor to a DC motor

I have a 3.5 hp AC motor I'd like to run on 12 volts.Any potential problems forseen with this?What changes would I need to make to the motor other than the 110 plug to a positive and negative battery hookup?Thanks for any advice and thanks for any help.skip

Question by xhdskip    |  last reply

24 V DC servo motor.

I have a 24 V DC servo motor. What do I need to plug it into AC outlet.?

Question by pooldoc    |  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

Need help choosing a dc motor!!

 Hi, My students are building model cars our of balsa wood that move b/c of a dc motor.  All of the motors I have are burning out - they can't run long, I used to have a dc motor that started out slow, built up speed and then ran fast and for a looooooong time.  Does anyone know what type of motor i'm talking about?  please help.....i gotta get them asap.  thanks! patti:)

Question by mckywer    |  last reply