Active Damping Control Method for Different Dual-Parallel-SPMSM Systems with Single Inverter

Abstract

This paper presents a stabilization method for different dual parallel surface permanent magnet synchronous motor(SPMSM) systems with a single inverter. When a single inverter drives two synchronous motors, disturbance can cause a torque difference between the two motors. This can cause the motor's electrical and mechanical resonance. Several damping control methods have been proposed to suppress such resonance. However, such methods consider that the parameters of the two motors are identical. When a single inverter controls two motors with different parameters, the damping control performance deteriorates. Besides, the motor's resonance sound and current ripple increase. To address these problems, this paper proposes a control method for dual-parallel-SPMSM drive systems with a single inverter.

Optimal Current Control Methods for Single-Inverter Dual-Parallel-SPMSM with Different Parameters

“…As described in Section 2.1, this study focuses on optimal current-control when two motors operate at the same speed in the steady state. The damping gain setting follows previous studies (12) (13) .…”

“…The problem with these methods is that since there is only one inverter, the system becomes unstable when a disturbance occurs (12) (13) . Moreover, the greater the load difference between the two motors, the worse the system efficiency.…”