PWM and Stall Torque

Is the voltage clamped, and the current continuous (filtered with an inductance somewhere, including armature inductance)?

You can limit stall current to whatever you want, of course, but looking at a stalled motor as a plain old resistor, you'll get whatever V = I*R says it should be. If you limit PWM to 50% of full rated voltage, then you'll get half of rated stall current (assuming it is rated at full voltage), and so on.

Tim

-- Deep Friar: a very philosophical monk. Website:

"allsey87"

** Same DC current flow as that produced by the equivalent applied DC voltage under stalled conditions.

Long as you know the supply voltage, motor winding resistance and PWM duty cycle - just use Ohm's law.

.... Phil

Presumably, it would be set by a current limit in your PWM switch; at least that's the way I did my last PWM thing. But in the case of the one I worked on, the motor was properly sized so that it didn't stall under normal operating conditions.

Good Luck! Rich