【摘要】 对用于有源磁悬浮轴承的连续型功率放大器与开关型功率放大器作了简单的比较．给出了采样-保持策略用于开关型功率放大器设计的基本思想．对基于采样-保持策略的开关型功率放大器的动态特性进行了分析，认为采样-保持策略对于提高有源磁悬浮轴承中的电流响应速度是有利的．更多还原

【Abstract】 The linear amplifier is compared with the switching amplifier in applying them to active magnetic bearings, which shows that the latter has higher efficiency and wider frequency band width than the former. A switching amplifier based on sample-hold strategy is introduced. Its dynamic characteristic is analysed. It is found that sample-hold strategy can improve the frequence characteristic of the electric current in active magnetic bearings.更多还原