A vehicle mounted super high speed permanent magnet brushless motor drive
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摘要: 超高速永磁無刷電機因其低電感和高換相頻率而普遍面臨轉子與定子過熱的困擾,而發熱的一個重要原因是進行脈沖寬度調制(PWM)引起的高頻電流諧波.對于逆變器處直接斬波調速方式,需要通過提高斬波頻率以減小電流諧波.但對于像燃料電池汽車空壓機用10 kW級電機驅動器,現有功率開關器件無法同時滿足開關頻率和功率的要求.因此在逆變器處斬波調速并不是驅動超高速永磁無刷電機的理想方案.為了減小定轉子損耗,本文從減小電流諧波的角度出發,設計了一臺前置Buck變換器無位置傳感器控制方波驅動器.通過反電動勢濾波電路以及換相位置補償角的優化設計將無位置控制的適用范圍擴展到3000~100000 r·min-1,對開發過程中遇到的關鍵問題進行了分析并提出了相應解決方案.最后,通過實驗驗證了該驅動器的控制性能.Abstract: Because of lower inductance and higher commutation frequency, caused by high-frequency current harmonics induced by the PWM control, super high speed permanent magnet brushless motors commonly face overheating of both the rotor and stator. For chopping directly at the inverter, the frequency should be increased to reduce the current harmonics. But for the 10 kW class motor drives used in the air compressors of fuel cell vehicles, the power switch devices currently do not fulfill the needs of switch frequency and power simultaneously. Therefore, it is not a good choice to regulate the speed by chopping at the inverter. Aimed at reducing losses in the stators and rotors, this paper presented the design of a pre-Buck square wave drive for reducing current harmonics. By optimizing the back electromotive force (EMF) filter circuit and commutation compensation angle, the operation range of sensorless control CAN was extended to 3000-100000 r·min-1. The key points encountered during the drive development were analyzed and solutions proposed. Finally, the excellent performance of the drive was demonstrated by experiment.
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Key words:
- eddy current loss /
- fuel cell /
- Buck converter /
- super high speed motors /
- air compressor
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參考文獻
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