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PMSM Control Strategy

PMSM Control Strategy. Reference: R. Krishnan, Permanent Magnet Synchronous and Brushless DC Motor Drives , CRC, 2010. Steady State Vector Diagram (1) . I d. jX q I q. jX d I d. I q. l f. R s I a. q axis. l net. d axis. l s. leading power factor. Steady State Vector Diagram (2) .

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PMSM Control Strategy

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  1. PMSM Control Strategy Reference: R. Krishnan, Permanent Magnet Synchronous and Brushless DC Motor Drives, CRC, 2010.

  2. Steady State Vector Diagram (1) Id jXqIq jXdId Iq lf RsIa q axis lnet d axis ls leading power factor

  3. Steady State Vector Diagram (2) Neglect Rs Or Id jXqIq Iq jXdId lf q axis lnet d axis ls leading power factor

  4. Steady State Vector Diagram (3) Define Close to Unity Power Factor

  5. General Considerations DC Motor PMSM Can use id for flux weakening control for IPM

  6. General Control Block Diagram Motor PPU DC Bus Electrical Input Mechanical Output gate control signals Controller Reference

  7. Motor Modeling (1) abc to dq Dynamical Equation dq to abc

  8. Motor Modeling (2)

  9. Inside the Controller gate control signals actually need two of them abc to dq Position Controller Speed Controller Current Controller d/dt * For reference

  10. Example: Hysteresis Current Controller * For reference gate control signals dq Current Calculator Hysteresis Controller dq to abc Current Controller Algorithm:

  11. Example: PICurrent Controller gate control signals Current Controller

  12. PMSM Control Strategies • Constant Torque and Flux Control • Zero Direct Axis Current Control • Unity Power Factor Control • Given Power Factor Control • Optimum Torque per Unit Current Control • Constant Power Loss Control • Maximum Efficiency Control

  13. Constant Torque and Flux Control Solve (transcendental) equations One choice would be: SPM dq Current Calculator

  14. Zero Direct Axis Current Control dq Current Calculator Steady State

  15. Unity Power Factor Control dq Current Calculator Solve (transcendental) equations

  16. Given Power Factor Control dq Current Calculator Solve transcendental equations

  17. Optimum Torque per Unit Current Control (1) dq Current Calculator

  18. Optimum Torque per Unit Current Control (2) dq Current Calculator

  19. Constant Power Loss Control dq Current Calculator In the implementation, flux weakening needs to be considered.

  20. Maximum Efficiency Control

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