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- 주제어 : Uneven air gap (검색결과 2 건)
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A Double Flux Magnetic Field Modulation Motor with Ventilation Slot and Uneven Air Gap
Jing Libing,Wang Tao,Tang Weizhao,Min Zeyu 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.4
Magnetic fi eld-modulated motors have the strengths of low speed, high torque, and high power density. However, the dual fl ux magnetic fi eld modulation motor (DFMM) structure is complex and not conducive to heat dissipation. To reduce losses and reduce the risk of permanent magnets (PMs) demagnetization, this paper proposes a DFMM with ventilation slot and uneven air gaps. The three symmetry slots of the outer stator are not connected to the winding for ventilation, which can eff ectively dissipate heat during motor operation. The proposed DFMM adopts a single-layer winding, which can reduce the complexity of wiring. The inner rotor permanent magnet adopts Halbach structure and uneven air gap structure to reduce the risk of PMs demagnetization. Finally, the temperature fi eld of the motor was calculated using fi nite element method. It was found that the output torque of the proposed DFMM increased by 16.92N m and the loss decreased by 19.52W. The proposed DFMM can increase the output torque and reduce the risk of PMs demagnetization.
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Design and research of deep slot universal motor for electric power tools
Qi, Huang,Ling, Luo,Jichao, Cao,Wei, Xi The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.6
In this paper, a deep slot universal motor is designed for electric power tools. The deep slot structure can reduce the cost of universal motor materials and improve production efficiency. A mathematical model of a universal motor is established and a simulation model is established by MagNet finite element software. Then, the static magnetic field distribution and load characteristics of the deep slot universal motor are analyzed. Different methods are adopted to improve the commutation spark of a deep slot universal motor. Finally, three 550-W and 9500-rpm prototype motors are tested. Simulation and experimental results indicate that an uneven air gap, brush offset by a certain angle, as well as different turns of the lead coil and the lag coil can effectively improve the commutation spark of a deep slot universal motor.
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