开关频率恒定与占空比调制相结合的<br/>PMSM-DTC控制

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Abstract In order to overcome the problems of large torque,flux ripples,and variable switching frequency existing in the direct torque control (DTC) for the permanent magnet synchronous motors (PMSM),an improved direct torque control strategy with a fixed switching frequency based on the simple duty ratio is proposed.The influence of the voltage vector on the torque and the flux with different angular velocities and stator flux positions is analyzed.A simple calculation of the duty cycle is then designed.The PWM modulation is generated based on the vector control (VC) to ensure the fixed switch frequency of the inverter.Simulation and experimental results validate that the proposed method is simple and robust,can diminish the torque and flux turbulence effectively,ensure the fixed switch frequency,and has better dynamic performances.

Key words： Permanent magnet synchronous motor direct torque control simple duty ratio torque ripple suppression fixed switching frequency

Received: 04 June 2015 Published: 25 February 2016

PACS:

TM351

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	Lü Shuaishuai
	Lin Hui
	Li Bingqiang

Cite this article:

Lü Shuaishuai,Lin Hui,Li Bingqiang. Direct Torque Control Based on Simple Duty Ratio and Fixed Switching Frequency for PMSM[J]. Transactions of China Electrotechnical Society, 2016, 31(3): 72-80.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2016/V31/I3/72

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