Hi,
The speed value from the eTPU SW resolver has a large error and fluctuation, about 600 rpm when the target is 4000 rpm. The excitation signal is generated by the SGEN module. Is there any notice when using SGEN for excitation? Or any parameter for the eTPU SW resolver might be changed?
Speed fluctuation: 100 rpm when 400 rpm
Speed fluctuation: 600 rpm when 4000 rpm
Best regards,
Hornby
Hi,
The fluctuation might be caused by the hardware/interface. Test from my side with a real motor and resolver, the error is little. Please see the snapshot.
Please check the hardware part, especially:
1. The phase between sin & cos waves from the resolver output to SDADC's pins. If there are phase shifts caused by the circuit.
2. The amplitude of the sin & cos waves. If the amplitude has a large difference when they are processed by the hardware circuit. And if the maximum peak value is over the design limit.
BRs,
Vincent
