Quote:
Originally Posted by dsirovica
The PWM cycle is (I believe) 50KHz
|
No, it's 15KHz (for a Jaguar) and 150Hz (for a Victor).
Quote:
|
so a DC meter will read the average and indeed show 6V
|
There's no guarantee that any given DC meter will read average. A true RMS DC voltmeter will read 8.5 volts. Some DC voltmeters read RMS, some read algebraic average, and some read neither.
Quote:
|
But that is not reality. If you use a scope, in "normal" operation, you will see a 50KHz squarewave (ignoring inductance distortion for clarity) with a 50% on/off duty cycle
|
The voltage waveform you see on a scope will depend on the motor, the motor controller, and the test conditions. With high inductance motors and high PWM frequency, the stalled-rotor current waveform will be DC with slight ripple.