How to find initial rotor position and gamma value in skew application without using macro ?

Snehal Shinde_22591
Snehal Shinde_22591 Altair Community Member
edited July 2021 in Community Q&A

I want to find torque at constant speed. so I need to understand what is gamma in current equation mentioned in brushless IPM motor example? how to find correct gamma value and how to find initial rotor position without using macro?

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Answers

  • Mohammed Elamin_22169
    Mohammed Elamin_22169 New Altair Community Member
    edited July 2021

    Hi Snehal, 

    The gamma angle (or control angle) is the angle between the current and the BEMF of the machine. typically has a value between 0 and 90 deg. People usually control this angle to maximize the torque in interior permanent magnet motor to utilize both reluctance and magnet torque or to push the machine into higher speed. In surface mounted PM the reluctance torque is typically not there and the control angle is zero or very small value. 

    If you are trying to compare the results to a test results you should know the control angle used and used to define the excitation in Flux. You can also sweep this angle in Flux (run parametric scenario) to find the best angle. 

    Regarding the initial position of the rotor, if you are not using the macro, you can look at the position of the ascending zero crossing of the BEMF of phase A and use that one with the excitation defined with Sin() function. 

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    Thanks, 

     

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