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Traction motors for electric vehicles and hybrid electric vehicles require wide power band characteristics. In order to increase the power band, field weakening control is widely used in interior permanent magnet motors.
Conventional Interior Permanent Magnet (IPM) Brushless DC (BLDC) motors use an array of alternating N and S pole Permanent Magnets (PM) in the air gap of the motor. This paper proposes a novel half-type IPM BLDC motor which uses only N pole PMs. By designing the half-type IPM BLDC motor, we were able to successfully reduce the amount of permanent magnets by 24 % while maintaining important characteristics...
Recently, electric power steering (EPS) systems have attracted much attention due to their advantages such as high fuel efficiency, tunability of steering feel, weight reduction of steering system, environmental friendliness, etc. [1-4]. However, vibroacoustic radiation noise occurs, which is not seen in hydraulic steering systems. The fundamental source of the vibroacoustic noise is considered to...
Electric and hybrid electric vehicles require traction motors that have a high power and efficiency over a wide rotation speed range. In order to satisfy these requirements and reduce the motor cost, variable flux reluctance motors (VFRMs) have been studied. Conventional VMFRMs have DC-field windings and armature windings [1]. However, because there are two kinds of windings, the coil space factor...
We have clarified that a magnetic-geared motor with permanent magnets in the high-speed rotor and stator slots shows a good performance in terms of the output power and transmission torque. This paper describes the influence of the magnetizing directions of the permanent magnets in the high-speed rotor and stator slots. The torque characteristics are computed using finite element analysis and are...
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