【摘要】 简要介绍了无轴承开关磁阻电动机的基本原理,根据转矩和悬浮力的控制策略,分析了三相半桥功率变换器的特点和不足。推导了转矩和悬浮力的小信号模型,分析了变换器绕组电流纹波对转矩和悬浮力的影响。在此基础上,提出了一种改进措施——悬浮绕组功率变换器采用三相四桥臂结构,电流数字滞环采用三态控制方式。然后介绍了三相四桥臂功率变换器的各种工作模式和数学模型,分析了两种变换器在数字滞环控制方式下电流纹波的大小和差别。样机实验结果表明了改进措施的有效性。更多还原

【Abstract】 In this paper the principle of a bearingless switched reluctance motor is briefly introduced.According to the control strategy of torque and radial force,the characteristics and disadvantages of the three-phase half-bridge power converter are explained.Then based on the small signal models of torque and radial force,the influence of current ripple on torque and radial force is analyzed.According to these analyses,the improved measure is taken that the levitated winding power converters adopt the three-phase four-leg topology and the digital hysteresis loop of current worked on tri-state control mode.Then all kinds of work states and mathematical models of power converters are expounded.The magnitude and difference between current ripples of two kinds of converters in digital hysteresis loop control mode are analyzed.The experimental results verify the effectiveness of the improved measures.更多还原