Pulse Width Modulation DC Motor Control


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Often, people attempt to control DC motors with a variable resistor or variable resistor connected to a transistor. While the latter approach works well, it generates heat and hence wastes power. This simple pulse width modulation DC motor control eliminates these problems. It controls the motor speed by driving the motor with short pulses. These pulses vary in duration to change the speed of the motor. The longer the pulses, the faster the motor turns, and vice versa.

Schematic

This is the schematic of the Pulse Width Modulation DC Motor Control

Parts

Part
Total Qty.
Description
Substitutions
R111 Meg 1/4W Resistor
R21100K Pot
C110.1uF 25V Ceramic Disc Capacitor
C210.01uF 25V Ceramic Disc Capacitor
Q11IRF511 MOSFETIRF620
U114011 CMOS NAND Gate
S11DPDT Switch
M11Motor (See Notes)
MISC1Case, Board, Heatsink, Knob For R2, Socket For U1

Notes

  1. R2 adjusts the speed of the oscillator and therefore the speed of M1.
  2. M1 can be any DC motor that operates from 6V and does not draw more than the maximum current of Q1. The voltage can be increased by connecting the higher voltage to the switch instead of the 6V that powers the oscillator. Be sure not to exceed the power rating of Q1 if you do this.
  3. Q1 will need a heatsink.
  4. Q1 in the parts list can handle a maximum of 5A. Use the IRF620 for 6A, if you need any higher.
  5. This circuit is not a true pulse width modulation control. Because only the frequency of pulses varies, it is really pulse frequency modulation. This works, though not as well as true PWM.

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Comments

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masterzee
Pulse Width Modulation DC Motor Control
Wednesday, April 16, 2014 8:01:06 PM
4011 for an oscillator??? The 4093 is much better with one Schmitt trigger on each input. Try and see...
anonymous
Pulse Width Modulation DC Motor Control
Thursday, January 16, 2014 11:29:24 AM
I am looking for a 24vdc 25amp pulsed dc controller capable of 700KHZ. Is there anything out there like this?
Jim
Pulse Width Modulation DC Motor Control
Saturday, August 13, 2011 10:15:47 AM
I've seen Pulse Width Modulation circuits that use the 555 chip. Is it possible to use those circuits with multiple N-FET to control a 70 amp motor?
Todd Winsor
Pulse Width Modulation DC Motor Control
Saturday, May 28, 2011 12:10:37 PM
I have a fishing troaling motor. I would like to control the speed of the motor. Its operating voltage is 12 to 24 VDC. Will this PWM control work ? If not---can anything be done to make it work ? Thanks !
wes clark
very slow moving motor
Wednesday, November 03, 2010 11:45:47 AM
i'm making a coyote decoy, and want to put a decoy on a motor and control it with a remote control from a old car, where can i find a reasonable motor to turn appr 8-15 rpm's while using like two d size batteries.
hassen
Pulse Width Modulation DC Motor Control
Wednesday, April 21, 2010 7:13:37 AM
i have an elevator final year project , and i want to select a dc motor. but the problem that i dont know how to control it. please can you help me. thanks
Cain
Pulse Width Modulation DC Motor Control
Wednesday, August 19, 2009 1:52:11 AM
If 24 VDC 10 AMP motor is brushed motor, you need KDS24050E, if it is brushless motor, you need KBS24051. Kelly controller is good. Their controller improves the perfomance of my motor. You can try it. Their website: newkellycontroller.com
Dave
Pulse Width Modulation DC Motor Control
Wednesday, July 08, 2009 1:41:14 PM
What is the best type of controller I can build for my 24 VDC 10 AMP motor? Im really wanting to know a most efficient design. Would it be a PWM integrated into an H-Bridge set up? Thanks all.
Jim Dandy
Pulse Width Modulation DC Motor Control
Thursday, June 25, 2009 8:33:57 AM
Definitely needs a freewheeling diode as someone else said. If there is no diode the drain voltage of the mosfet when it turns off will fly up high enough to avalanche the fet and make it run very hot. Diode will improve efficiency quite a lot. Use a schottky type for voltages up to about 50v.
sanjay
Pulse Width Modulation DC Motor Control
Wednesday, June 03, 2009 4:32:32 AM
am to make a speed controller for a dc motor 24v. This motor is 24 v 500 watts and battery is 10 amps, please send me a diagram,as fast as u can.thanks
Bruce Freeman
DC gen. to power DC motor with speed control
Saturday, May 09, 2009 8:54:45 AM
I have a small gas turbine turning a 28 volt generator/350 amps. I would like to use this to power a DC motor with some kind of speed control that I could install on a go-cart or other small vehicle. Does anyone have any suggestions or help? Thank you, Bruce
anonymous
Pulse Width Modulation DC Motor Control
Sunday, April 26, 2009 7:13:40 AM
Can anyone tell me using (appropriate terminology) how a microcontroller could be used to control the speed of a dc motor? Please would be very helpful as i have my exams coming up soon and i do not want to fail Technological studies.
56k_Freak
Pulse Width Modulation DC Motor Control
Wednesday, January 28, 2009 10:44:38 PM
-.- this is all baby stuff, anyone help me design an effective H bridge pulsed motor control for a 140 amp / 24v 4hp motor? Must be able to sync 2 together for 2 motors (forward and reverse).
anonymous
Pulse Width Modulation DC Motor Control
Thursday, January 01, 2009 1:15:44 AM
i m doing a project with using a 7.2V batery and i need a 3amp motor driver. can anyone help me figure out how the motor driver should built?
David
Pulse Width Modulation DC Motor Control
Wednesday, December 31, 2008 3:24:58 AM
I have a golf buggy with 2 motors driven from separate smit triggers but a common oscillator, one motor runs faster than the other. Is there something I can do to slow one down easily.
anonymous
Pulse Width Modulation DC Motor Control
Wednesday, November 26, 2008 8:45:52 AM
The circuit can be better if the MOSFET is replaced to higher current ratings, maybe 30A or 50A.
johnny
Pulse Width Modulation DC Motor Control
Thursday, October 16, 2008 6:46:03 PM
hey, if you are looking for a pwm dc motor control. you can find it at. www.circuitspecialists.com look for kits. it works a lot like this one works.
Mehmood ul Haque
Pulse Width Modulation DC Motor Control
Monday, September 01, 2008 10:13:22 AM
There are enough PWM circuits around the internet based on the 555 for anyones handy use. Size the output transistor ( ideally a power FET ) for whatever you are driving, and limit the supply to the 55 to about 15vd max, Its not too particular about it's supply being ' well regulated' the whole point of it's design!
KAUSTAV MUKHERJEE
Speed Control of DC Motor using Pulse Width Modulation Technique
Wednesday, August 27, 2008 9:43:45 AM
I, am pursuing a project regarding speed control of DC Motor using PWM technique. We have been told to do the needful circuit using 555 Timer. Can you please help me out ??
jeffrey wascome
Pulse Width Modulation DC hydrogen fuel cell
Friday, August 15, 2008 11:09:29 PM
i need a pwm switch to control my hho cell i need to feed it with some where between 5 to 15 amps . is there away it can be built to take care what i want

(Editor's notes: Good luck with that: http://www.aaroncake.net/forum/topic.asp?TOPIC_ID=7606)

anonymous
Pulse Width Modulation DC Motor Control
Friday, July 25, 2008 4:02:30 PM
In fact, this circuit WILL NEVER work ! ! The motor will never spin ! ! there is a component missing ! ! Without a freewheeling diode in parallel with the motor, it doesn't even start spinning...

(Editor's notes: It works as pictured. I've built it several times. However it is simply not a PWM controller, but a pulse-frequency-modulation controller.)

Humberto Bravo
Pulse Width Modulation DC Motor Control
Tuesday, July 22, 2008 2:56:39 PM
I need to build a controller PWM mulation motor 14 volts an 30 amps rating will you please help mi out. thank's
GTech
Pulse Width Modulation DC Motor Control
Sunday, June 22, 2008 6:32:37 AM
I'm new to this tech, but I wanted to know, can this be used in combination with a PWM or is it intended to replace the PWM. for example I want to limit amperage usage to 25 amps and the frequency at 20k, or am I completely missing the point. Please advise.
Carl
Pulse Width Modulation DC Motor Control
Wednesday, June 04, 2008 3:18:12 AM
I need a pwm to handle 12 volts @ 5 to 10 amps. will the circuit on this page manage that? Thanks
abdo
Pulse Width Modulation DC Motor Control
Saturday, May 10, 2008 4:24:51 PM
help me about control motion of DC MOTOR every motion one degree every 4 mintes tanks
Ranjeet
Pulse Width Modulation DC Motor Control
Sunday, April 13, 2008 11:36:52 PM
Can this PWM technique be used to control speeds of higher power motors using SCRs/TRIACs
anonymous
Pulse Width Modulation DC Motor Control
Wednesday, March 26, 2008 2:55:32 AM
There are enough PWM circuits around the internet based on the 555 for anyones handy use. Size the output transistor ( ideally a power FET ) for whatever you are driving, and limit the supply to the 55 to about 15vd max, Its not too particular about it's supply being ' well regulated' the whole point of it's design!
anonymous
Pulse Width Modulation - speed control of single phase induction motor
Sunday, March 02, 2008 2:20:31 AM
Hi.. Im doing the project on the topic mentioned.I want some theory for the chopper fed with uncontrolled rectifier and controlled by a PWMsignal...
anonymous
Pulse Width Modulation DC Motor Control
Wednesday, February 27, 2008 12:07:27 PM
are there any examples with CMOS cd4016 switches. specifically, various events at timing sequences[ 1 minute, 2 minutes so on] are activated...with the switch in question.
Dude
Pulse Width Modulation DC Motor Control
Wednesday, February 20, 2008 1:57:04 AM
for a class project i have to build a go cart that has a car starter motor on it would this be the thing to use??? keeping in mind that the car starter motor kan draw up to 700 amp at peak!!!!!! thanx for ur help !!!!
paul brown
Pulse Width Modulation DC Motor Control
Sunday, January 27, 2008 4:28:12 AM
this is a pulse FREQUENCY motor speed controller, not Pulse width. you are only varying the frequncy of pulses , and it will always operate at 50% duty cycle.
zak
Pulse Width Modulation DC Motor Control
Saturday, January 26, 2008 7:50:47 AM
So how do we to go about doing a PIC based PWM motor speed controller? Any schematics to help ? thx!
Audioguru
Pulse Width Modulation DC Motor Control
Thursday, January 17, 2008 10:22:43 AM
This circuit does not produce PWM. The two Cmos inverters are connected as an ordinary variable frequency oscillator. The motor will receive a square-wave so will run at about half power. Changing the frequency will change its power a little because of its inductance. When the pot is shorted then the motor will jump to full speed or will stop.
bala
Pulse Width Modulation DC Motor Control
Thursday, January 17, 2008 2:18:06 AM
nice one
anonymous
Pulse Width Modulation DC Motor Control
Monday, January 14, 2008 5:40:44 AM
where do i connect higher voltages to?
anonymous
Pulse Width Modulation DC Motor Control
Thursday, January 10, 2008 12:16:21 AM
This type of controlling method is toys, can't do big job. try to utilize SCR/TRIAC to control high volt motor, at lease 1 HP.
anonymous
Pulse Width Modulation DC Motor Control
Wednesday, January 09, 2008 3:54:53 AM
YOU MUST USE TWO 741 OP-AMPS AND YOU MUST CONNECT NON- INVERTING TERMINAL TO GROUND OF THE SECOND OP-AMP,IT MUST BE AN INTEGRATOR CIRCUIT, THE FIRST ONE MUST BE AN INVERTER
ianus
Pulse Width Modulation DC Motor Control
Tuesday, January 01, 2008 6:45:09 AM
i was wondering how this is benificial to us and what it does scientifically speaking
Bob
Pulse Width Modulation DC Motor Control
Friday, December 28, 2007 2:31:55 AM
If you bypass R2 with a 10K resistor and a diode in series, this will shorten the recovery almost independent of the R2 setting. Connect Q1 G to either 3 or 4 dependong on diode orientation.
Lanh
Pulse Width Modulation DC Motor Control
Wednesday, December 19, 2007 10:43:29 AM
I want to control DC motor with 110VDC, I don't know what component I need to you. Help me!
M.Muruganandam
Pulse Width Modulation DC Motor Control
Monday, December 17, 2007 8:20:41 PM
i need to start a high rating dc motor (upto 20 KW) so i need a starter circuit diagram with power electronics switches isted of contactors because the contactors will produce sparks and which fails duecourse. so please give me the circuit diagram for starting high rating dc motor
Jaro
Pulse Width Modulation DC Motor Control
Friday, December 14, 2007 10:05:45 PM
Steve, you may wanna search on ebay for 80 amp controller
anonymous
Pulse Width Modulation DC Motor Control using 8051
Thursday, December 13, 2007 2:47:29 PM
i want to control the speed of a small dc motor using AT89C51 by pulse width modulation technique!
Steve
Pulse Width Modulation DC Motor Control
Friday, December 07, 2007 5:27:06 PM
My son has a go cart with two 36 volt 500 watt (each) motors. I am looking for the correct speed controller to drive both motor. I currently have a 36v 500 watt controller, but when connected to the both motors it does not send enough power to both. Do you guys have a controller that will work for two motors? Thank you Steve R
Student
Pulse Width Modulation DC Motor Control
Thursday, December 06, 2007 3:37:24 AM
I would like this motor to turn a lead screw. All i want it to get a signal from a motion sensor and turn on, run in one direction for 5 inch then back fack 5 inch. Is this possible from this circuit if it is being controlled by a pic16f88
nguyenvu
Pulse Width Modulation DC Motor Control
Tuesday, November 27, 2007 9:17:13 AM
i want to control motor dc with IRF 540 and AT89C52
anonymous
Electronic controller of a small reversible dc drive
Friday, November 23, 2007 8:20:36 AM
i want to make a project on the above given topic .so i need a complete information about this topic with circuit diagram also.
anonymous
230 V, 5 A, 3 h.p. dc motor speed control using PC
Thursday, November 22, 2007 12:53:15 AM
I want to make project and i need the complete information regarding the same, so please kindly help me.
raj
speed control of dc motor by using chopper circuit
Thursday, November 15, 2007 8:04:01 PM
i want to make a project on the above given topic .so i need a complete information about this topic with circuit diagram also.
anonymous
Pulse Width Modulation DC Motor Control
Tuesday, October 23, 2007 9:22:07 AM
pls send me more theroy about the dc motor running with pwm
anonymous
Pulse Width Modulation DC Motor Control
Wednesday, October 17, 2007 1:39:38 PM
Hello, can someone suggest, how can I control speed of a 1.5-3 V DC motor and timer ( how often will it move and how much) pleasee helppppp
Dan
Pulse Width Modulation DC Motor Control
Tuesday, October 16, 2007 8:45:57 AM
I need to control a 1.5 horse motor. Will this controller do that, and if not how can I modify it to do so? Thanks Dan
bukhari
Pulse counter
Tuesday, October 16, 2007 12:22:18 AM
how to build a pulse counter? the signal either in 5 or 12 V alternately, and the counter will have 7 segments to view counts. generally, the counter gets signal from pulse generator..
bapitha
IGBT based Pulse Width Modulation AC chopper
Friday, September 14, 2007 6:11:37 AM
i want the circuit diagram and operation of the IGBT based PWM AC chopper
snonymous
Pulse Width Modulation DC Motor Control
Thursday, September 13, 2007 1:16:39 PM
I want to know what pulse width modulation is and how it works, particularly in relation to DC machines such as generators and motors
James
Pulse Width Modulation DC Motor Control
Monday, September 10, 2007 8:44:02 AM
Placing a reverse-bias diode in parallel across the switch on the source side will help reduce voltage spikes caused by applying PWM to the motor inductance.
techojack
Pulse Width Modulation DC Motor Control
Sunday, September 09, 2007 9:16:26 PM
Check out the integrated circuit manufacturers like NXP.They have various chips for the job as well as application notes. As for that cnc job with the drooping verticle axis,I suspect you may be dealing with a logic transient condition ; an untested power sag related fault in the control/feedback circuitry.The fact that you get no creep on an E Stop switch condition sez she's power/reinitialization related.Check with the machines manufacturer who may have a mod and or controller software upgrade.Also make sure your power is right,no 208vac for a 220 machine etc...youd be surprised at the c**p that brings up.
anonymous
Pulse Width Modulation DC Motor Control
Friday, September 07, 2007 9:48:24 PM
more info on pwm theory..simple http://homepages.which.net/~paul.hills/SpeedControl/SpeedControllers.html
Amarinder
Pulse Width Modulation DC Motor Control
Wednesday, September 05, 2007 5:10:15 AM
Can anybody suggest me how to control the 180V DC motor of 2.5HP motor using PWM with DC voltage 330VDC available.
ashish bansal
Pulse Width Modulation DC Motor Control
Sunday, September 02, 2007 1:57:18 PM
i want full knowledge of dc motor speed control by pwm with ckt.....plz give me knowledge
neel
Pulse Width Modulation DC Motor Control
Tuesday, August 07, 2007 4:04:54 AM
i need both speed control of dc motor and a simple timer circuit with it actually i needed it in a lift mechanism so please help me
Rob
Use a 555 timer
Tuesday, July 24, 2007 7:57:55 PM
If you use a 555 timer you can easily modify the pulse width. The circuit would be much similar and more effective.
jack
Pulse Width Modulation DC Motor Control
Tuesday, July 24, 2007 6:02:42 AM
for dc speed control using pulse width modulation can we use DSP kit for gerneration of these pulses
Jude Thibault
Pulse Width Modulation DC Motor Control
Monday, July 16, 2007 3:28:58 PM
I am trying to find a voltage contoller / rheostat/ to control the rpm's of a 24VDC motor,max.50 amps.draw. from O to 100 % power. I have looked high and low to date have not located one. Does any one know if such a control is available ? Hopefully at a price bordering $100.00 or less..
anonymous
Pulse Width Modulation DC Motor Control
Tuesday, July 10, 2007 12:56:55 PM
please provide me the simple cct. of 12 v dc motor controller using PWM.
Prashant
Problem of DC Motors in CNC machine
Tuesday, July 10, 2007 2:26:22 AM
Our problem is in all CNC machines which have DC Motors whenever there is a power failure the vertical axis falls slightly even though it has a brake , if emergency is pressed in normal condition the axis doesnt fall but on any power faliure the axis fall slightly causing failure of expensive cutting tools. Please guide for some solution or wethre this is a problem in DC Motors
sameer
Inverted pendulum control
Thursday, July 05, 2007 8:33:38 AM
HI guys, I am sameer i am doing project on inverted pendulum. can any one help me how can we interface motor to cpu. what type of controller we required for stepper motors and how can we calculate the speed of the motor
Dean
Pulse Width Modulation DC Motor Control
Wednesday, June 27, 2007 3:18:27 PM
I need to control the speed of a 90V dc motor, 1/4 hp. Can anyone help me with this? I could use either a pot or foot-control. Thanks.
be_wine
Pulse Width Modulation DC Motor Control
Friday, June 15, 2007 5:32:31 PM
the pwm (pulse width modulation) is pulses that can given to the mosfet to control by the output of the voltag to the motor and by control the time of the high of the pulse you can control by the speed of the moto
Dr Butto Rajhanstani
Pulse Width Modulation DC Motor Control
Wednesday, June 13, 2007 11:22:20 AM
I see some significant problems with the circuit as it is prone to wasting power. I would suggest adding an H-Bridge circuit for better performance.
Walt
Pulse Width Modulation DC Motor Control
Sunday, June 03, 2007 8:51:22 AM
How would I modify the Pulse widht modulation circuit to handle 18 volts? 3-5 amps , and what wouldatrue pulse width modulation circuit look like, since this is pulse frequency modulation circuit?
anonymous
Pulse Width Modulation DC Motor Control
Tuesday, May 29, 2007 10:53:33 AM
Jameco said 4011 CMOS NAND Gate has been discontinued, it is no longer available. They didn't show a replacement. Is there a suitable replacement that would be commonly available?
james
Pulse Width Modulation DC Motor Control + dsPIC+ positioning
Thursday, May 24, 2007 7:07:22 AM
Hi I need help with a project I am currently working on. I am using a absolute encoder and a dspic how is ithat I can control the motor
Xion
Baby monitoring alarm
Monday, May 21, 2007 8:24:16 PM
Hey i was wondering if you had a circuit for a baby monitoring alarm, I requireit for my project, and it would give me a starting point to build around.I would be very greatful if you could post one up for me to have look at Many thanks
anonymous
Pulse Width Modulation DC Motor Control
Wednesday, May 16, 2007 9:16:45 AM
its nice system
davaadorj
Pulse Width Modulation DC Motor Control
Tuesday, May 15, 2007 5:02:07 AM
pwm dc motor control example scheme help please
manikandan k
Pulse Width Modulation DC Motor Control
Saturday, May 12, 2007 9:57:23 AM
i want to run 2 DC motors ,operating voltage of 20V and curent rating of 3A(each) .i want to know ,is there any dual motor driver ic to run this motors witout any trouble. Now iam using L298 dual motor driver IC,current rating of 4A total current .Its making trouble like hanging of motors. please give your valuable suggestions to me.
anonymous
Pulse Width Modulation DC Motor Control
Friday, May 11, 2007 11:33:21 AM
I need a simple project about DC motor control with PID or somethingelse. I'm an electrical engineering student in Turkey,erdinc erol,but my profession is about biomedicals and quantum mechanics. I have to finish school this week,and one theacher wants DC Motor project. please help me with that. Could you send me some detailed papers.
anonymous
Pulse Width Modulation DC Motor Control
Thursday, May 10, 2007 3:03:30 AM
isn't this better if you just use a 555 timer, and use a pot to control the pulse oscillation, then Output to a transistor?
anonymous
Pulse Width Modulation DC Motor Control
Wednesday, May 09, 2007 3:13:16 PM
how we can control the speed using pwm with L298N the H bridge (dual H bridge)
james
Pulse Width Modulation DC Motor Control + positioning
Wednesday, May 09, 2007 7:06:52 AM
Hi I need help with a project I am currently working on. I am using a absolute encoder and a dspic how is ithat I can control the motor
Teddy
sinusoidal PWM to convert single phase to three phase .
Tuesday, May 08, 2007 2:44:05 AM
I am doing my final project on this area and solicite you to send me if anything you believe valuable. THANKS
Dan
Pulse Width Modulation DC Motor Control
Wednesday, April 18, 2007 12:48:53 AM
The comment about putting a diode shunt across the motor addresses a valid point. The inductance of the motor may produce large voltage spikes that possibly can destroy the power transistor. Having built a similar circuit I can attest that the shunt diode should have a current capacity equal or greater than the drive current. I tried a 6 amp diode on a 1/2 HP 24V motor. I got half a block down the road and it failed as a short which blew out a bank of transistors rated for 100 amps.(I had no fuse) After a rebuild, I used a 50 amp diode and it worked well ever since.
allenkf
Pulse Width Modulation Control For a 24 V DC Motor
Tuesday, April 10, 2007 4:54:49 AM
Hi, I am asking the same question which Johnathan has asked on March 21. Much grateful if I can the information. Thank you.

(Editor's notes: Post your question in the forum.)

rajeev
Pulse Width Modulation DC Motor Control
Thursday, April 05, 2007 12:45:36 PM
sir i want information about how pulse width mo. can hepl the dc moter speed control give me infor
Gizachew Addis
Wireless DC Motor Controller
Saturday, March 31, 2007 3:29:58 AM
Wireless dc-motor control can be made using timer IC based transmitter and microcontroller based receiver.Additionally, PWM control of dc motor is implimented using computer programmes .I want you to focus on how to implement the project and pass the information you have got that,if you are willing to do so.I am doing my final year project on ''Wireless DC motor Controller using computer programmes''. THANK YOU in advance.
mekashaw hailu
Pulse Width Modulation DC Motor Control
Wednesday, March 28, 2007 4:42:06 AM
PWM control of dc motor are mostly implimented using micro controllers and PLC .I want you to focus on that direction and pass the information you have got that,if you are willing to do so.I am doing my final year project on ''PLC based DC motor using PID technique''. I THANK YOU
vaibhav gholap
Pulse Width Modulation DC Motor Control
Thursday, March 22, 2007 7:40:20 AM
is it run? will u plz give more information about it & working?
van
Pulse Width Modulation DC Motor Control
Thursday, March 22, 2007 5:11:58 AM
I would like to know how to control the speed of a DC motor for an open loop system with the use of a DC Chopper
Jonathan
Pulse Width Modulation DC Motor Control
Wednesday, March 21, 2007 3:50:20 AM
I am to make a speed controller for a dc motor 24v. This motor is for a scooter and i am going to insert electrical braking too, Can this type of circuit help me ? and do you have any idea how to make electrical braking pls? This is for my school project
MINH THANH
Pulse Width Modulation DC Motor Control
Tuesday, March 20, 2007 10:12:47 AM
My name is Minh Thanh. I'm a student of Technique University in Vietnam.Now, I have a project about DC motor control.That is a small motor which is attached to a toy car(about 6-24 V DC). I hope that you can guide me something or give me any related document. Thank you!
VINEETH
PID DC Motor Control using microcontroller
Sunday, March 18, 2007 10:00:01 AM
plz send as early
acmefixer
Pulse Width Modulation DC Motor Control
Saturday, March 10, 2007 1:36:55 PM
A 1N4002 rectifier diode should be added across the motor, with the cathode to positive. It should be on the left side of the polarity switch. This is to prevent spikes from the motor from damaging the MOSFET. One other observation. If I remember correctly, the oscillator always puts out a pulse with exactly a 50% duty cycle. So no matter how you adjust the speed, the motor will never be able to run as fast as if it had the 6VDC directly applied. And since the frequency is varied, it is likely that the inductance and other characteristics of the motor will greatly influence the speed. I think I would build this as a test circuit abd experiment with it before I would depend on it for use in an operating project.
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