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Influence of Magnetic Slot Wedge on Parameter and Loss Distribution of High Voltage Induction Motor
Qiu Hongbo,Wang Kun,Liu Ziyang,Xiong Bin,Wu Xuandong 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.6
Owing to the stator open slot structure of the high-voltage motor, the magnetic field distribution in the motor will be uneven, and the performance of the motor will deteriorate. When the slots are embedded with magnetic material slot wedges, the magnetic field of the motor will be changed. In this article, taking a 10 kV/1000 kW high-voltage induction motor (HVIM) as the prototype, the two-dimensional finite element models are established, the eff ect of magnetic slot wedge (MSW) on HVIM was analyzed. First, by establishing the air-gap permeance function, the infl uence of magnetic slot wedge on the air gap magnetic field is analyzed, the influence mechanism of magnetic slot wedge on tooth harmonic magnetic field is revealed. In addition, the effect of magnetic slot wedge on excitation inductance, slot leakage resistance, and winding inductance of HVIM is analyzed in detail, the variation of parameters with different relative permeability of slot wedge is summarized, the changes in the motor starting performance had further discussed. Finally, the influence of the slot wedge permeability on motor losses is studied, the distribution of core loss is obtained by establishing the motor segmenting model, and the various mechanisms of core losses in different regions are revealed. The findings provide the guidelines and theoretical basis for the rational selection of magnetic slot wedges.
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Qiu Hongbo,Liu Ziyang,Xiong Bin,Zhao Qiang,Dong Yu,Wu Xuandong 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.4
When the high-speed permanent magnet starter-generator (PMSG) is operating, the permanent magnets will be aff ected by high centrifugal forces. It is necessary to add a sleeve to protect the rotor and interference fi t with the permanent magnet. However, the performance of the high-speed PMSG will be signifi cantly infl uenced by the electromagnetic characteristics of the sleeve material. In this paper, a high-speed permanent magnet starter-generator for the micro-gas turbine is used as an example, and the two-dimensional fi nite element model is established. The correctness of the model is verifi ed by comparing the experimental data with the calculated data. Taking 10,000 r/min as the ignition speed, the diff erences of motor starting performances when using diff erent sleeve materials are compared. Secondly, decoupling the complex coupling torque in the starting process, the infl uence of material electromagnetic characteristics on the asynchronous torque and braking torque is determined, and the infl uence mechanism of material electromagnetic characteristics on the torque characteristics of highspeed PMSG is revealed. In addition, the eff ects of the sleeve materials on the output performance and loss of the high-speed PMSG are determined, and infl uence mechanism is revealed. On the basis, a sleeve multiplexing scheme is proposed to improve the starting performance while reducing the eddy current losses in the generating state. The results of the study provide reference and theoretical value for the optimization of high-speed permanent magnet starter-generator.
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