The Sample-hold Strategy Based Switching Power Amplifier for Active Magnetic Bearings

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.