Hello,
I am in trouble to drive a BLDC Motor -170W with a 3-phase driver circuit, which is designed by me.
My PWM frequency is 40 kHz and I just try to get a graph about the relationship between the stall current (I mean the current with blocked motor shaft) over PWM duty cycle (from %10 to %70)
In trapezoidal driving mode; why the stall current is rising linear up to %50 PWM duty cycle and rising exponentially over %50 PWM duty cycle? What difference happening over %50 PWM duty cycle?
PWM/Current
100 / 0.5A
200 / 1A
300 / 1.5A
400 / 2A
500 / 2.5A
600 / 4A
700 / 15A
What could be the possible reason for it?
Is this normal?
Thanks and looking forward to your reply.
I am in trouble to drive a BLDC Motor -170W with a 3-phase driver circuit, which is designed by me.
My PWM frequency is 40 kHz and I just try to get a graph about the relationship between the stall current (I mean the current with blocked motor shaft) over PWM duty cycle (from %10 to %70)
In trapezoidal driving mode; why the stall current is rising linear up to %50 PWM duty cycle and rising exponentially over %50 PWM duty cycle? What difference happening over %50 PWM duty cycle?
PWM/Current
100 / 0.5A
200 / 1A
300 / 1.5A
400 / 2A
500 / 2.5A
600 / 4A
700 / 15A
What could be the possible reason for it?
Is this normal?
Thanks and looking forward to your reply.
Last edited: