Abstract
Due to the rising price of rare-earth materials, permanent-magnet (PM) machines in different applications have a trend of reducing the use of rare-earth materials. Since iron-core poles replace half of PM poles in the consequent pole (CP) rotor, the PM machine with CP rotor can be a promising candidate for less rare-earth PM machine. Additionally, the investigation of CP rotor in special electrical machines, like hybrid excitation permanent-magnet PM machine, bearingless motor, etc., has verified the application feasibility of CP rotor. Therefore, this paper focuses on design and performance of PM machines when traditional PM machine uses the CP rotor. In the CP rotor, all the PMs are of the same polarity and they are inserted into the rotor core. Since the fundamental PM flux density depends on the ratio of PM pole to iron-core pole, the combination rule between them is investigated by analytical and finite-element methods. On this basis, to comprehensively analyze and evaluate PM machine with CP rotor, four typical schemes, i.e., integer-slot machines with CP rotor and surface-mounted PM (SPM) rotor, fractional-slot machines with CP rotor and SPM rotor, are designed to investigate the performance of PM machine with CP rotor, including electromagnetic performance, anti-demagnetization capacity and cost.
Highlights
The consequent pole (CP) rotor is first proposed and applied in the hybrid excitation permanentmagnet (PM) machines, where extended field-weakening capability can be obtained under the common influence of CP rotor and field DC winding.[1]
Considering that iron poles replace half of PM poles in CP rotor, traditional PM machine with CP rotor can be a promising candidate for less rare-earth PM machine
A 44pole-48slot fractional-slot concentrated-winding (FSCW) PM machine with the CP rotor is designed by response surface methodology and a prototype of 20pole –24slot FSCW PM machine with the CP rotor is tested.[9,10]
Summary
In the CP rotor, all the PMs are of the same polarity and they are inserted into the rotor core. It can be seen that the generated fundamental flux density in the air gap changes with the PM pole-arc coefficient of consequent pole rotor αp, where αp. Where B1 and B2 are amplitudes of flux density in the PM-pole and iron-core-pole air gap, respectively; Bδ1 is amplitude of fundamental flux density in the air gap; LFe is axial length of rotor core. When αp 1.3 (by calculation of (3)), the amplitude of fundamental flux density Bδ1 can reach maximum value. Maximum voltage (DC) Maximum current Outer diameter of the stator Inner diameter of the stator Axial length Radial length of air gap thickness of PM Inner diameter of rotor Pole pairs Number of slots
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