Consider an experiement with a DC source feeding an coil with a constant DC current I. The coil with an iron core attracts a magnetic plate with mass m with force F. The force F is higher than Fm and the plate is kept in place. Now the DC source is substituted with a PWM controlled output. Say with duty cycle 50% and a DC level leading to same rms current A. What will hapen if the frequency of the PWM is increased?
A) Nothing, a PWM with same duty cycle at 1kHz, 10kHz, 100kHz or 1MHz still create the same magnetic force still lifting the plate.
B) There will be a maximum frequency where F=Fm and the plate will drop off if frequency increased further.
I'm trying to understand if sudden releases and issues never seen before in an industrial process could be related to the fact that new type of HW has increased PWM frequency from <10kHzish to ~100kHzich could be the root cause. Current levels are measured by fast clamps and at same level. Voltage at 110VDC same as before. Also very interested in the physics behind if it one would run some simulations around it.