采用解析法和有限元法分析了轴向倾斜偏心故障下无刷直流(brushless direct current,BLDC)电机的电磁力,并对比了轴向对称倾斜偏心与轴向非对称倾斜偏心时的转子不平衡磁拉力差异。通过建立三维静态倾斜偏心模型,分析了偏心前后电磁力...采用解析法和有限元法分析了轴向倾斜偏心故障下无刷直流(brushless direct current,BLDC)电机的电磁力,并对比了轴向对称倾斜偏心与轴向非对称倾斜偏心时的转子不平衡磁拉力差异。通过建立三维静态倾斜偏心模型,分析了偏心前后电磁力的产生机理、空间阶次及频率特征;并以某型BLDC电机为例,基于三维有限元模型分析了其电磁力密度及不平衡磁拉力特性。研究结果可为滚筒洗衣机用BLDC电机倾斜偏心的故障诊断与分析提供理论依据。展开更多
In the conventional cascade control structure of aerospace electrically powered actuators, the current(or electromagnetic torque) loop plays a critical role in realizing a rapid response for a digitally controlled B...In the conventional cascade control structure of aerospace electrically powered actuators, the current(or electromagnetic torque) loop plays a critical role in realizing a rapid response for a digitally controlled Brush Less Direct Current(BLDC) motor. Hysteresis Current Control(HCC) is an effective method in improving the performance of current control for a BLDC motor.Nevertheless, the varying modulating frequency in the traditional HCC causes severe problems on the safety of power devices and the electromagnetic compatibility design. A triangular carrier-based fixed-frequency HCC strategy is expanded by relaxing the constraints on the rising and descending rates of the winding current to advance the capability of HCC to realize fixed-frequency modulation in the steady state. Based on that, a new flexible-bound-size quasi-fixed-frequency HCC is proposed, and the range feasible to realize fixed-frequency modulation control can cover the entire running process in the steady state. Meanwhile, a corresponding digital control strategy is designed,and four digitalization rules are proposed to extend the capacity to achieve fixed-frequency modulation control to the unsteady working state, that is, a novel fixed-frequency modulation is realized.Simulation and experimental results prove the effectiveness of this improved fixed-frequency HCC strategy.展开更多
摘要采用解析法和有限元法分析了轴向倾斜偏心故障下无刷直流(brushless direct current,BLDC)电机的电磁力,并对比了轴向对称倾斜偏心与轴向非对称倾斜偏心时的转子不平衡磁拉力差异。通过建立三维静态倾斜偏心模型,分析了偏心前后电磁力的产生机理、空间阶次及频率特征;并以某型BLDC电机为例,基于三维有限元模型分析了其电磁力密度及不平衡磁拉力特性。研究结果可为滚筒洗衣机用BLDC电机倾斜偏心的故障诊断与分析提供理论依据。
基金supported by the National Natural Science Foundation of China (Nos.51275021,61327807)
摘要In the conventional cascade control structure of aerospace electrically powered actuators, the current(or electromagnetic torque) loop plays a critical role in realizing a rapid response for a digitally controlled Brush Less Direct Current(BLDC) motor. Hysteresis Current Control(HCC) is an effective method in improving the performance of current control for a BLDC motor.Nevertheless, the varying modulating frequency in the traditional HCC causes severe problems on the safety of power devices and the electromagnetic compatibility design. A triangular carrier-based fixed-frequency HCC strategy is expanded by relaxing the constraints on the rising and descending rates of the winding current to advance the capability of HCC to realize fixed-frequency modulation in the steady state. Based on that, a new flexible-bound-size quasi-fixed-frequency HCC is proposed, and the range feasible to realize fixed-frequency modulation control can cover the entire running process in the steady state. Meanwhile, a corresponding digital control strategy is designed,and four digitalization rules are proposed to extend the capacity to achieve fixed-frequency modulation control to the unsteady working state, that is, a novel fixed-frequency modulation is realized.Simulation and experimental results prove the effectiveness of this improved fixed-frequency HCC strategy.