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Radial Flux PMSM Design and Optimization

Radial Flux PMSM Design and Optimization. Liping Zheng 02/21/2003. Radial Flux PMSM Structure. Shaft. Stator Outer Diameter = 30mm Stator Inner Diameter = 21.7mm Rotor Diameter = 14mm PM Width = 7mm PM Height = 13mm PM Material= NdFeB39H Motor Active Length = 43mm. PM. Winding.

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Radial Flux PMSM Design and Optimization

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  1. Radial Flux PMSM Design and Optimization Liping Zheng 02/21/2003

  2. Radial Flux PMSM Structure Shaft Stator Outer Diameter = 30mm Stator Inner Diameter = 21.7mm Rotor Diameter = 14mm PM Width = 7mm PM Height = 13mm PM Material=NdFeB39H Motor Active Length = 43mm PM Winding Laminated low loss core

  3. Winding Method • 2-pole, 3-phase. • 5 coils/phase/pole. • Two layer lap winding. • Pitch: 23/30. • First coil: btm1->top12. • Round copper wire –AWG14. • Bare diameter: 0.0641in (1.63mm). • Diameter after insulation: 0.0673in (1.71mm).

  4. Fractional (Distributed) Winding • The coils of a fractional winding within each pole region are distributed over many pairs of slots. • Distribution factor: Reduce the harmonics of the spatial mmf distribution.

  5. Short-pitching • Use short-pitching to further reduce harmonics. • The pitch factor for the fundamental: • For nth harmonic pitch factor. W=23 τ=30 3rd and 9th are not harmful. 5th and 7th have negative effect to the torque.

  6. BEMF of Fractional & Concentrated Winding Fractional winding and short-pitching reduce the harmonics greatly.

  7. Simulated BEMF

  8. Simulated Airgap Flux

  9. Arnon 5- BH Curve

  10. Arnon 5- Loss 45W/lb

  11. Efficiency * Bearing loss is not included.

  12. Shaft with the Bearings for Test Motor length = 43mm End length = 20mm Total length = 83mm

  13. Conclusion • Have modified the winding structure and re-adjusted the pitch factor. • Have selected the high energy NdFeB39H. • The motor active length is reduced from 50mm to 43mm. • Have considered the ball bearing connection structure for the test purpose. • Will do mechanical drawing using pro/E in the next step.

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