| 基于直接反电动势法的无刷直流电机准确换相新方法 |
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| 引用本文： | 林明耀,周谷庆,刘文勇.基于直接反电动势法的无刷直流电机准确换相新方法[J].东南大学学报(自然科学版),2010,40(1). |
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| 作者姓名： | 林明耀 周谷庆 刘文勇 |
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| 作者单位： | 1. 东南大学伺服控制技术教育部工程研究中心,南京,210096
2. 东南大学电气工程学院,南京,210096 |
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| 基金项目： | 江苏省自然科学基金资助项目((BK2008306) |
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| 摘 要： | 分析了上桥臂PWM调制、下桥臂恒通调制方式时的端电压波形,讨论相应的反电动势过零点检测方法.在PWM调制信号开通状态结束时刻对端电压进行采样,由软件算法确定反电动势过零点.针对电机运行时存在超前换相或滞后换相的情况,通过设置合理的延迟时间来实现最佳换相.针对实际电机存在反电动势过零点分布不均匀的情况,根据过零点间隔时间存在着周期性规律,提出一种新的延迟时间设置方法,使换相点位于相邻过零点的中间位置,实现了电机的准确换相.实验验证了所提出方法的可行性和有效性.
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| 关 键 词： | 反电动势法 端电压 过零点检测 换相 无刷直流电机 |
New accurate commutation method based on direct back-EMF method for brushless DC motor |
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| Lin Mingyao,Zhou Guqing,Liu Wenyong.New accurate commutation method based on direct back-EMF method for brushless DC motor[J].Journal of Southeast University(Natural Science Edition),2010,40(1). |
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| Authors: | Lin Mingyao Zhou Guqing Liu Wenyong |
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| Institution: | Engineering Research Center for Motion Control of Ministry of Education;Southeast University;Nanjing 210096;China;School of Electrical Engineering;China |
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| Abstract: | The sensorless control drive for brushless direct current machine(BLDCM) is investigated based on direct back electromotive force(back-EMF) detection method. The terminal voltage waveform is analyzed for the H_pwm-L_on type of modulation,and the zero-crossing point detection methods are discussed.The terminal voltage is sampled at the end of pulse width modulation(PWM) onstate and the zero-crossing point is extracted from the proposed algorithm.The effects of the leading and the lagging commutation on the o... |
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| Keywords: | back electromotive force method terminal voltage zero crossing point detection commutation brushless direct current machine |
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