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The linear permanent magnet (PM) vernier machine (LPMVM) can reach a higher thrust density at low speed compared to the regular linear PM machines due to the utilization of the magnetic gear effect, which makes it a good solution for low-speed direct-drive applications. In order to further improve the machine thrust density, a novel LPMVM with consequent-pole and Halbach PM array is proposed and optimized...
This paper presents thermal analysis of a water-cooled dual-stator axial-flux permanent magnet (AFPM) machine with focus on the sandwiched rotor. The rotor of the machine is featured by combined rectangle-shaped magnets. Firstly, the eddy current losses in the PM are calculated and analyzed. Secondly, lumped-parameter and FE thermal models are established to calculate the temperature distribution...
In recent years, high speed direct drive spindle motors are obtaining more and more attentions due to their compact structure, high efficiency, low vibration and noise. Compared with those of high speed machines used for electric vehicles (EV) and refrigerator compressors, the shaft of a spindle motor is always thicker to satisfy the mechanical support requirement. When the overall outer diameter...
Permanent magnet vernier (PMV) machines are attracting more and more attention due to its high power density and simple mechanical structure. In this paper, a novel PMV machine with improved permanent magnet circuit is proposed. For the proposed PMV machine, half of the PMs in the rotor are moved from rotor to the stator slot opening, and Halbach array PMs are employed in the stator. The analysis...
In interior permanent magnet (IPM) machines, dq-axis coordinate system is usually employed to analysis the machine. In commonly, the d-axis is coincided with the axis of pole. However, dq-axis armature reaction will not only affect the amplitude of the PM flux linkage, but also make dq-axis offset from the position under no load condition. These will lead errors for the traditional dq-axis coordinate...
This paper presents a triple-rotor axial-flux spoke-array vernier permanent magnet (TR-AFSAVPM) machine to enhance the performance of vernier machines. By cooperating spoke-array rotor and coil-wounded winding, power factor and torque density of the proposed machines are much improved and their copper utilization is reduced as well comparing with conventional vernier machines. Firstly, the machine...
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