Abstract
Permanent magnet (PM) excited vernier machines capable of high torque density have good potential for electric vehicles while requiring high rare earth PM consumption. To achieve a high torque density at a reasonable material cost, hybrid PM excited vernier machines incorporating both expensive rare earth and low-cost ferrite magnets are investigated in this paper. Various combinations of PM arrangements for the hybrid permanent magnet excited vernier machine are investigated to acquire low cost and superior torque density. The best solution obtained is that the PM on the stator adopts rare earth material while the rotor uses ferrite. Furthermore, the PMs on the stator are arranged in an iron-cored Halbach array, which can reduce leakage flux and enhance flux density effectively and the ferrite PMs are used in the rotor, therefore, high-temperature demagnetization is avoided. Then, the reluctance torque and the cogging torque can offset each other effectively, which is beneficial to reducing the torque ripple and smoothing the electromagnetic torque. Finally, a prototype is manufactured and tested to verify the correctness of the theoretical analysis.
Highlights
With the development of industrial technology, high-torque electrical machines attract more and more attention in direct drive applications [1–4]
Many researchers have focused on magneticallygeared permanent magnet (PM) machines and PM vernier (PMV) machines, which provide high torque density due to the principle of the so-called magnetic gear effect
In order to reduce the cost of the machine, a lot of electrical machines with less rare earth PM, ferrite, or even no magnets, were proposed in [29–33]
Summary
With the development of industrial technology, high-torque electrical machines attract more and more attention in direct drive applications [1–4]. To make full use of system space and improve the torque density, many dual-sided permanent magnet (PM) machines have been proposed [5–7]. To improve the torque density, many new kinds of PMV machines have been proposed. In order to reduce the cost of the machine, a lot of electrical machines with less rare earth PM, ferrite, or even no magnets, were proposed in [29–33]. A new kind of PMV machine using the Article low-cost ferrite was proposed in [34]. In order to achieve a high torque density at a reasonable cost, a hybrid permanent-magnet excited vernier (HPMV) machine incorporating expansive rare earth and inexpensive ferrite magnets is a compromise solution. Topology and Operation Principle obtain high torque at a low speed This remarkable feature gives the PMV machine a
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