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In this paper, the acoustic noise and vibrations due to Maxwell forces of a 4-pole, 12-slot, high-speed brushless DC motor (BLDC) is analysed up to 90 kRPM. The harmonic magnetic forces present in the machine are first analytically characterized, and validated with numerical simulations using MANATEE® electromagnetic and vibro-acoustic software. The effects of rotor vibrations due to bearing faults,...
A field weakening control applying a modified overmodulation strategy is proposed to improve the stability of the PMSM drive system. The modified overmodulation is combined with the voltage feedback control to achieve a robust deep field weakening range for the machine. With the proposed control strategy, no switching is required between theMTPA, constant power and MTPV operating regions so that a...
This paper presents a novel method for torque ripple reduction in PMSM drives at variable speed, using a combination of angle-based repetitive control and deadbeat current control. Based on the internal model principle, repetitive control is capable to reduce periodic torque ripple by generating a compensating action that consequently need to be synchronized with the original ripple. The time to angle,...
The paper proposes a new operation method of permanent magnet synchronous machines in single phase AC grids by using a dual-inverter topology. The proposal is targeting on the reduction of current harmonics and maximization of the power factor of the drive system. This can be achieved without additional energy storing inductors, like filter- or PFC-chokes. This new operation method can be considered...
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