bittware
Full Member level 4
motor inductor
Hello experts,
I am using PWM to control DMOS H-bridge to drive a brush DC motor. When PWM switches off, the current flowing through inductor can't be cut simultaneously. It will find a path through freewheeling diode. But the motor rotor is still spinning, the Back-EMF has a trend to force the current to inverse.
My question is:
Whether the current flowing through motor inductor would reverse or wouldn't reverse at all in a limited switch off time?
If yes, how to determine when the current flowing back?
I'll be very appreciated if you could provide a quantitative analysis based on physics formula.
Thanks in advance!
Hello experts,
I am using PWM to control DMOS H-bridge to drive a brush DC motor. When PWM switches off, the current flowing through inductor can't be cut simultaneously. It will find a path through freewheeling diode. But the motor rotor is still spinning, the Back-EMF has a trend to force the current to inverse.
My question is:
Whether the current flowing through motor inductor would reverse or wouldn't reverse at all in a limited switch off time?
If yes, how to determine when the current flowing back?
I'll be very appreciated if you could provide a quantitative analysis based on physics formula.
Thanks in advance!