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Fractional slot, concentrated-winding (FSCW) machines with saliency are being researched extensively for vehicle traction motors. However, they exhibit higher torque ripple than their equivalents without saliency. This paper identifies the origin of the torque ripple and explores potential solutions for its reduction through modification of the stator slot openings. The concept is demonstrated through...
In electric traction, Linear Induction Motors (LIMs) have become a competitive alternative, especially for low speed applications where machines with short stators are commonly used. Due to driving dynamics tolerances, LIMs are characterized by their relatively high magnetizing current. Employing multiphase stator winding design may be a viable technique to reduce the current per phase, which reduces...
In the conventional dq model of permanent magnet machines, machine parameters are assumed sinusoidal, leading to a smooth calculated output torque. This is justifiable in distributed-wound stators. However, in permanent magnet machines with concentrated-wound stators, the assumption of sinusoidal machine parameters is no longer valid. Therefore, an extended dq model is proposed in this paper for machines...
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 focus of this paper is on investigating the influence of skewing on the torque production of an Interior Permanent Magnet Synchronous Machine (IPMSM). The machine is designed as a traction machine according to the requirements of a parallel hybrid electric commercial heavy vehicle. In order to meet the requirements, the machine is designed with a speed higher than that of the conventional powertrain...
This paper investigates the performance capabilities of a continuously variable magnetic gearbox that utilizes a flux focusing rotor structure. A fractional slot stator winding is designed to couple to the outer rotor of an existing magnetic gearbox in order to enable the magnetic gearbox to operate with a variable gear ratio.
In general, PM machines with conventional integer slot distributed winding (ISDW) schemes exhibit significant cogging torque resulting in high torque ripple which makes them unsuitable for EV applications which require low torque pulsations. This paper presents detailed analysis of the performance of PM Synchronous motor (PMSM) with fractional slot distributed winding (FSDW) scheme which shows significant...
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