DC motor speed control

[Deleted]

Dear ALL...

I have a DC motor (permanent magnet DC motor), the motor ratings are:

180VDCV and 8Amp
it runs at 7200 rpm full speed..

Now, I want to control this motor speed using PWM..



what is recommended for switching the armature ON and OFF, MOSFET or BIPOLAR?
if MOSFET is preferable, using it as LOW-side driver or HIGH-side driver?
i don't need to reverse the motor direction, but can I use two MOSFET or BIPOLARS running
simultaneously and the motor placed between them?
what is the recommended MOSFET driver to acheive this work properly?

thanx in advance .. SHENDY

[Gary Lecomte]

Oct 16, 2008 7:49:28 GMT -8 @mahmoudshendy said:

Dear ALL... I have a DC motor (permanent magnet DC motor), the motor ratings are:

180VDCV and 8Amp
it runs at 7200 rpm full speed..

Now, I want to control this motor speed using PWM..
what is recommended for switching the armature ON and OFF, MOSFET or BIPOLAR?
If MOSFET is preferable, using it as LOW-side driver or HIGH-side driver?
i don't need to reverse the motor direction, but can I use two MOSFET or BIPOLARS running simultaneously and the motor placed between them? what is the recommended MOSFET driver to acheive this work properly?

thanx in advance .. SHENDY

Well A Mosfet is More Efficient than a transistor for Switching application.
And I Don't see any advantage to using Two as you suggest below.

But your going to need a Pretty High voltage Mosfet with a good suppression circuit to prevent Inductiive Kickback from distroying the mosfet.

And I would suggest one Rated at least 400 Volts and 10 amps minimum.

Good Square waves from PWM can also cause a lot of NOISE in the motor.