Comments on: PWM motor speed controller

By: DerekOCUK

DerekOCUK — Wed, 23 Jun 2010 21:05:20 +0000

Admin,
I need a circuit to control the speed of a 230/240V dc motor, (separately excited field and rotor windings) which is driving an AC alternator. (need speed control to maintain accurate frequency on ac !)
Please help

By: Edgardo M. Diolola

Edgardo M. Diolola — Wed, 16 Jun 2010 09:52:02 +0000

Dear Admin,
I wish to have both functional circuits for 110VDC and 230VDC, 5 – 8 AMperes motors, using easy to find componenets / parts.
Thank you in advance.

By: derek

derek — Wed, 31 Mar 2010 17:48:37 +0000

I am using an owi 007 robot arm and I am trying to control it with a 2 phase dc motor with pwm and a dragon 12 board. The owi 007 robot arm has 5 dc motors that are each powered with 1.5V D batteries (1.5V power supply). Should I use a similar schematic in comparison with yours? If not, then what should I do?

By: admin

admin — Thu, 17 Dec 2009 12:14:17 +0000

Just replacing the MOSFET willnot do the job for you. For high voltages like 230V DC, you need a more efficient circuit. I will add one soon.

By: Karthi

Karthi — Sat, 12 Dec 2009 16:31:07 +0000

I need to control a 230V, 6A DC motor.
Can I just replace BUZ10 with IRF840?
http://skory.gylcomp.hu/alkatresz/IRF840.pdf

Any other changes needed?

By: PAUL H

PAUL H — Wed, 26 Aug 2009 05:29:42 +0000

HI, I WISH TO BUILD A HIGH POWER 12V DC – DC SIMPLE SPEED CONTROL FOR GOKART, H/DUTY CAR BATTERY, GEARED SERIES TYPE STARTER MOTOR 20 – 30AMP CONTINUOUS. SUITABLE FOR SKILLS OF A ELLECTRICAN. THANKS

By: qwill

qwill — Thu, 06 Aug 2009 04:40:24 +0000

Not really.

I need the PWM and 12 volt Dc supply.

Would putting suitable thermistor across either, from centre tap of pot to end or would it be better to use lower value pot and have thermistor in series at end.

It’s for fan on this computer which is very noisy and isn’t needed at full speed all the time. Needs to keep pulse rate constant just vary the duty cycle. What is good/best pulse rate for such a fan.

By: admin

admin — Wed, 05 Aug 2009 19:47:42 +0000

Are these circuits enough for your application
http://www.circuitstoday.com/temperature-controlled-fan-regulator
http://www.circuitstoday.com/temperature-controlled-dc-fan

By: qwill

qwill — Sat, 01 Aug 2009 01:54:35 +0000

How would you modify this circuit so that the minimum speed can be set/adjusted and include temperature control so that if temperature rises the fan goes faster.

By: admin

admin — Wed, 22 Jul 2009 19:27:48 +0000

A bridge circuit using high voltage, high current diodes like BY127 diodes will rectify 23OV AC.
But what is your application.

For a good design of such a power supply the designer must know the exact application.

What is your required current rating.
Do you need regulation.