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Post by Deleted on Oct 16, 2008 7:49:28 GMT -8
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
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Post by Gary Lecomte on Oct 16, 2008 13:42:12 GMT -8
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.
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