This paper deals with the comparison of two types of permanent magnet high-speed machines. Specifically, the effect of permanent magnet magnetization pattern on the rotor losses is investigated. On the basis of analytical field analysis and two-dimensional (2-D) finite-element method, this paper predicts the flux harmonics and rotor losses under no-load condition. It is shown that the Halbach magnetization is superior to parallel magnetization in terms of producing rotor losses.
This paper deals with the analysis of high speed machines with diametrically magnetized rotor, accounting for slotting effect. On the basis of a two dimensional (2-D) field solutions derived in terms of magnetic vector potential and polar coordinate systems, this paper predicts open-circuit field, armature reaction field, field on load, torque and back emf. In particular, new magnetization modeling technique which is reasonable in polar coordinate system is presented. The analytical results are validated extensively by comparison with finite element (FE) analyses.
This paper shows that high-speed starter/generator system is more efficient for gas turbine engine for mobile auxiliary power unit. The system is rated at 25kW, 325Vdc, 60krpm .The system also provides 4kw to start the 100kW engine. The system consists of a high speed machine directly coupled to the gas turbine engine, a power control unit (PCU), and an electronics controller. The PCU is consist of boost converter that boost from 24V(Battery of Vehicle) to 235V for driving high-speed motor, inverter drive PMSM (Permanent Magnet Synchronous Motor), and buck converter drop the voltage to 28V. For PMSM driving the system applied SVPWM (Space Vector Pulse Width Modulation), sensorless algorithm. And then, to supply optimized power, "Constant Power Control Algorithm" is applied.(a) Structure of 3 shafts 1 CONCLUSION This paper has described the design objectives, hardware, control algorithm and test results for a high-speed permanent magnet motor/generator system. This paper also shows possibility of high-speed motor/generator system for gas turbine engine starting, power generation. And mobile APU is come true due to boost converter, optimization of starter system is possible using the constant power control algorithm.Future work will be made toward more compact and effective starter/generating system for other application.
We propose an interior permanent magnet syhchronous motor (IPMSM) with arc-shape ferrite permanent magnets (PMs) as a substitute for the rare-earth permanent magnet, and determine its optimal design through parametric study. First, we use 2D finite element analysis to analyze 4-poles and 6-slots initial model according to performance requirements and design parameters. The current angle of the maximum average torque considered in the analysis is different compared with the current angle of the minimum torque ripple. Thus, the parametric study for optimal rotor design is performed by varying the thickness and the offset radius of the PMs according to current angle. In particular, a narrow bridge is required in conventional IPMSM for reducing flux leakage; however, the increase in cogging torque in the analysis model saturates the narrow bridge (large offset radius). Therefore, we suggest an appropriate shape considering limiting conditions such as DC link voltage, average torque, torque ripple, and cogging torque taking into account performance requirements.
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