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The thermal demagnetization of the magnet by the eddy-current loss at high rotational speeds often becomes one of the major problems in the PM machines [1].
Soft magnetic composite (SMC) material is a new soft magnetic material, now it is popular in the designing of permanent magnet machine where high operation frequency and 3-D flux path required, due to its advantages of low eddy current loss and magnetic isotropy.
Compared with three-phase SRM, multi-phase SRM is higher power density and lower torque ripple. However, with phase number increasing, the requirement of power converters for multi-phase SRM such as using less power devices and independence between phases are enhanced. In this paper, six kinds of power converters for six-phase SRM are investigated and compared including asymmetric half bridge (AHB)...
The third harmonic current is commonly injected into the fundamental one to improve the output torque of the multi-phase machines. It can interact with the third harmonic back-EMF, contributing to positive torque. However, the output torque may not always be improved with the third harmonic current injection under the same rms value constraint. The optimal ratio of the third harmonic current to the...
Upon the increasing attentions on energy efficiency and hence environmental protection, the development of the electric vehicles (EVs) has been accelerating [1]. Particularly, the electronic differential (ED) system has been developed to eliminate the heavy gearbox for the curvilinear movement [2]. Yet, the traditional ED system is achieved by controlling each of the wheels independently, while fatal...
In this paper, a long flux-path winding connection (SSNN) mode of SRM is presented. SSNN mode can reduce the mutual inductance between conducting phases, and thus realize the decoupling between each phase. Based on a six-phase 12/10 SRM, extensive finite element analysis simulation results demonstrate the effectiveness of the proposed winding connection.
Flux-switching DC-field (FSDC) machine has the merits of low-cost and flux control ability. Furthermore, this type of machine also possesses the advantage of fault-tolerant capability [1]. However, a few studies have been done on the analyses of fault signatures of this type of machine even though it has two sets of windings [2].
Recently, Mars exploring draws more and more attention due to the successful landing of Mars Rovers. It was over 64 months for the Spirit Rover working on Mars. Also, since January 25, 2004, the Opportunity Rover works over 10 years on Mars. These two Rovers work much longer than their design period of 3 months. Furthermore, another NASA Mars Rover, the Curiosity Rover, works very actively on Mars...
Since intermediate mechanical conversion mechanisms for speed, torque and motion conversion can be entirely eliminated, the direct-drive wave power generation attracts more and more attention [1]. Among various proposed generators, the permanent-magnet (PM) vernier generator is considered as a viable solution for the wave energy harvesting. This generator can efficiently harness this low-speed and...
Mechanical gearbox, which plays significant roles in vehicular transmission system, inherently suffers from the drawbacks of wear-and-tear and regular maintenance [1]. Magnetic gears are considered as the preferred gearing device for vehicular transmission system because they have the merits of silent operation, maintenance free and physical isolation. However, the gear ratio of magnetic gear is fixed...
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