Hi Pratheesh,
I understand that you are trying to determine the offset of an absolute encoder by injecting a small ( V_d ) and incrementally adjusting the electrical angle.
You can follow the below steps for precise calculation of offset:
- Ensure that the encoder's resolution is sufficient to detect small changes in angle accurately.
- Minimize noise in the encoder signal as they could affect the accuracy of the offset calculation.
- Make sure that the mechanical alignment of the encoder with the motor shaft is precise, as any misalignment can introduce errors in the readings.
- When adjusting the electrical angle, make sure that the increments are small enough to capture precise changes in torque and encoder readings.
- Take multiple measurements at each angle and average them to reduce random errors and improve reliability.
- Since you are getting maximum torque at a different offset, this could indicate that the torque-producing current is not perfectly aligned with the rotor field. Make sure that the ( V_d ) and ( V_q ) components are correctly oriented.
You can refer the below documentation links for more info:
