Tool/software:
Hi TI expert
We are using a BLDC motor(8 poles) with a motor control controller MCF8329A to construct an electric water pump.
To keep track of the real motor speed, we use the FG output signal.
We found the FG output issues when performing the motor examination.
FG waveform result outputting approximately 1.58 kHz instead of the rotor detection frequency (approximately 60 Hz), when motor runs at 3625 rpm,(See waveform below.)
The driving speed (FG output frequency) and the actual motor speed are synchronized when the motor has been stopped and started three or four times, at which point the FG signal is generally generated (approximately 60 Hz).
However, FG output issues could appear after restarting and resetting the motor power.
[1. FG signal malfunction]
[2. Normal Condition of F.G Signal]
[Inquiry details]
1. What are the potential causes of the error?
2. Could you provide advice on the improvement methods?
Best Regards,
Thao N
