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This paper mainly focuses on the analysis of the eddy current loss in permanent magnet (PM) of the surface-mounted PM vernier machine (SPMVM). The eddy current losses under open-circuit, armature reaction and load conditions are detailed investigated by the analytical method and finite-element analysis (FEA). The influence of the pole ratio, which is defined as the ratio of the rotor PM pole-pairs...
Linear vernier permanent magnet machines (LVPMMs) for direct-drive servo applications are attracting more and more attentions due to its high force density, easy maintenance, rapid dynamic response, etc. This paper proposes a new LVPMM structure which has a similar secondary as that of a regular linear PM machine, while its primary mover is composed of three modules, which are separated by flux barriers...
This paper mainly deal with the radial force and vibration of the surface-mounted permanent magnet vernier machine (SPMVM) with the integer slot distributed windings (ISDW) and the fractional-slot concentrated windings (FSCW). The harmonic order and frequency of the radial force in SPMVM with the permanent magnet surface-mounted on rotor or stator tooth are detailed discussed by the analytical and...
Stator DC winding Excited Vernier Reluctance Machines (DC-VRMs) are a kind of novel machines, which are investigated more and more owing to absence of expensive permanent magnet material. However, DC-VRMs are found to have large torque ripple if they are not carefully designed. There are a lot of existing methods to reduce the cogging torque in permanent magnet (PM) machines, but the design techniques...
Due to the high torque density and sharing similar operating principles with vernier machines, the magnetic-geared permanent magnet machines have been gaining more attention recently. This paper focuses on power transferring feature of a magnetic geared machine among the stator, modulation layer and rotor by analytical methods. Analytical equations of the back electromotive force, torque and power...
Active magnetic bearings can not only solve the bearing wear and life problems but also reduce the loss and noise of bearings, which makes it more and more popular in the use of high speed motor. In this paper, the design procedure and control method are presented for four-axis magnetic bearings designed for a 200kW/40000rpm high speed motor. The working principle and actuator model of magnetic bearings...
This paper investigates the production tolerances and variations of the lamination and permanent magnet on the cogging torque of the surface permanent magnet (SPM) machine with mass production. The finite element analysis (FEA) and experiment contrasted analysis method is adopted to deal with the additional component cogging torque, of the 12 slots 10 poles combination SPM machine, caused by production...
In recent years, surface permanent-magnet vernier machines (SPMVM) have been attracting more and more attention for several advantages, including a high torque density and a simple mechanical structure. However, the influence of the pole ratio, which is defined as the ratio of rotor pole pair numbers to winding pole pair numbers, and the winding pole pair numbers on the performance of SPMVMs has not...
Direct-drive Permanent Magnet Synchronous Generators (DDPMSG) are gaining increasingly more attention and application for wind power. This paper presents a comparison among the performance of DDPMSG equipped with three commonly used winding types, integer-slot distributed winding (ISDW), fractional-slot concentrated winding (FSCW) and fractional-slot distributed winding (FSDW). Loss distribution,...
Vernier machine is becoming a new generation of direct drive motor due to its feature of high torque at low speed based on the so-called “magnetic gear effect”. This paper investigates the winding pole number and the pole ratio defined as rotor pole number/winding pole number of the surface permanent magnet vernier machines (SPMVM) for performances of torque, power factor, etc. The variation of design...
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