Re: Why did my drive blow up?
- From: Mitch Berkson <mitch_news@xxxxxxxxxxx>
- Date: Tue, 28 Feb 2006 21:02:47 GMT
"BRW" <bennet@xxxxxxxxxxxxxxxxxx> wrote in
news:1141158730.716650.95490@xxxxxxxxxxxxxxxxxxxxxxxxxxxx:
Flyback voltage occurs no matter what direction the motor is running.
It occurs as the circuit attempts to dissipate the energy of the
collapsing magnetic field in the motor when the current is interrupted
(when the MOSFETs shut off the current as part of the PWM switching).
Yes. But if you just turn the appropriate MOSFETs on and never turn them off
(i.e., don't pulse them), there is no flyback voltage.
If you have a small motor, it might be worthwhile to debug using that first.
You could also try an experiment with operating the circuit with no motor.
This would reveal if there is a problem with sequencing the MOSFETs.
Mitch
.
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