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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.
Usually, multi-degree-of-freedom (multi-DOF) systems consist of a number of single-DOF actuators, making the structure of these systems complicated. Furthermore, they have a slow response and low positioning accuracy due to their inevitable problems such as a large backlash, non-linear friction and kinematic singularities in the operation range. The number of actuators and the weight of the overall...
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...
Multi-degree-of-freedom (multi-DOF) systems are often used in humanoid robots and factory automations. In these systems, a lot of motors are equipped to achieve multi-DOF motions like human arms and also caused problems such as heavy weight, large size and no back drivability. In order to solve the problems, there have been many outstanding works to achieve multi-DOF motions using 1 actuator. Wang...
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...
Previously, a variable speed vernier magnetic gear was proposed. In this paper, the vernier magnetic gear is combined with a generator to produce a continuously variable speed vernier magnetic geared generator. Combining the generator with the gear has the advantage of making use of space harmonics that are not contributing to the operation in a useful way. Also, this way the overall amount of material...
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