Study on three-level power amplifier of magnetic bearings for high speed machine

In order to meet the requirement of magnetic suspension bearings for high speed machine, the three-level PWM switching power amplifiers are designed and tested. The carrier triangular wave phase shift method is used in the design. The comparative study on the three-level PWM switching power amplifier with the two-level PWM switching power amplifier indicates that the three-level PWM technique can effectively reduce the current ripple of the suspension force control windings. The experimental results of the prototype verify the feasibility and effectiveness of the proposed three-level switching power amplifier.