Design Challenges of Synchronous Machines Types

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This research work presents:

  • Independent design calculation of a 2 hp reference stator.
  • Independent design of the rotor of the wound rotor synchronous motors suited to 2 hp, and inner radius of the reference stator.
  • Independent design calculation of the rotor of a PM motor suited to 2 hp and inner radius of the reference stator.
  • Physics-based phase variable modeling of the PM and wound rotor synchronous motor. Calculation of the performance measure of all of the motors using a physic-based phase variable model of motors connecting to an IGBT PWM drive.

FE-based phase-variable model

The proposed work will yield the following results:

  • Producing a torque at all of the rotor angle position is not possible, where in some case the back emfs are all in phase.
  • The back EMF waveforms of the studied cases are not balanced for 8-22 pole numbers
  • Having a common speed variable drive with a control strategies suited to a wide power zone beside the common stator maybe necessary
  • For having a low ripple machine, the drive needs to be compatible for both of semi-trapezoidal and semi- sinusoidal back emf waveforms
  • Rotor outer diameter and the air gap flux density straightly influence the motor performance but the designer have no control on those values
  • Drive system need to have a capability to generate high torque at lower speed without excessive overload of the stator windings and to operate at constant power at higher speed
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