Investigation of Electromagnetic Losses Considering Current Harmonics in High-Speed Permanent Magnet Synchronous Motor
MDPI energies:
In the peer reviewed research what they found is:
When sinusoidal and harmonic currents were applied to the HPMSM, the DC copper losses remained the same in both cases. However, the AC copper losses increased significantly under PWM excitation due to the presence of high-order current harmonics. At low operating speeds, the difference in core losses between sinusoidal and harmonic current operation was relatively small, at approximately 11%. As motor speed increased, however, the core losses associated with PWM current became substantially higher, reaching a 30% increase compared to sinusoidal operation. Furthermore, rotor eddy current losses were particularly affected by the PWM current; across all operating points, the rotor eddy current loss increased by approximately 70% compared to the losses observed under sinusoidal current excitation.
You cant forget the rotor as part of the iron losses and Dr Okon knows all about it as he has had returned plenty of motor where the magnets were permanently damaged. That's why magnovol slot wedges to protect them can broaden the efficiency band significantly.
MDPI energies:
In the peer reviewed research what they found is:
When sinusoidal and harmonic currents were applied to the HPMSM, the DC copper losses remained the same in both cases. However, the AC copper losses increased significantly under PWM excitation due to the presence of high-order current harmonics. At low operating speeds, the difference in core losses between sinusoidal and harmonic current operation was relatively small, at approximately 11%. As motor speed increased, however, the core losses associated with PWM current became substantially higher, reaching a 30% increase compared to sinusoidal operation. Furthermore, rotor eddy current losses were particularly affected by the PWM current; across all operating points, the rotor eddy current loss increased by approximately 70% compared to the losses observed under sinusoidal current excitation.
You cant forget the rotor as part of the iron losses and Dr Okon knows all about it as he has had returned plenty of motor where the magnets were permanently damaged. That's why magnovol slot wedges to protect them can broaden the efficiency band significantly.
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