How I can identify the working of PMSM according to the angle obtained from rotor position sensor? For example, suppose the angle is 30 degrees, how can I know which phases are conducted?
Dear Suja,
the very simple answer is: You can't.
Why so?
Because the angle alone is not enough to determine the operation of the machine.
What direction is it spinning?
What torque is desired?
Is the speed static?
What is the control scheme?
If you know the answer to these questions, then the dynamic of the machine along with the control scheme is known and the math behind it all will give you the voltage to the machine's terminals and eventually the phases connected
Dear Suja
I dont know , how my explanation will help u. Let say the 4 pole PMSM. The electrical frequency is 2 times faster than the mechanical frequency. So, when the mechanical angle reaches 6.28 rad, the electrical angle reaches 6.28 rad two times. We cannot predict the speed at an angle 30 degree.
Hello Suja
The basic principle is that stator magnetic field must be controled in a way that the two magnetic field vectors (rotor and stator) are kept orthogonal. The rotor position sensor is used to generate the stator field angle.
Hi,
Connect DC current supply plus to one of the phases and the minus to another. Increase the current until the rotor moves and then stops. Read the shaft angle. Repeat with other phase combinations. Now you know what angle corresponds to all possible states of the converter.
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