Abstract
With the development of electric vehicles and More-Electric/All-Electric aircraft, high reliability is required in motor servo systems. The redundancy technique is one of the most effective methods to improve the reliability of motor servo systems. In this paper, the structure of dual-redundancy permanent magnet synchronous motor (DRPMSM) with weak thermal coupling and no electromagnetic coupling is analyzed and the mathematical model of this motor is established. However, there is little research on how to suppress the torque ripple caused by short-circuited coils in the DRPMSM. The main contribution of this paper is to present the advantages of DRPMSM and to find a way to suppress the torque ripple caused by the short circuit fault in DRPMSM. In order to improve operation quality and enhance the reliability of DRPMSM after a short circuit occurs, the torque ripple caused by the coils inter-turn short circuit fault in DRPMSM is analyzed in detail. Then, a control method for suppressing the electromagnetic torque ripple of a short-circuited coil is proposed for the first time by using an improved adaptive proportional resonant (PR) controller and a proportional integral (PI) controller in parallel. PR control is a method of controlling alternating components without steady-state error, and it can be used to suppress torque ripple. DRPMSM adopts speed and current double closed-loop control strategies. An improved adaptive PR controller and a PI controller are employed in parallel for the speed loop, while traditional PI control is adopted in current loop. From the simulation and experimental results, the torque ripple is reduced from 45.4 to 5.6% when the torque ripple suppression strategy proposed in this paper is adopted, in the case that the speed is 600 r/min. The torque ripple suppression strategy based on the PR controller can quickly and effectively suppress the torque ripple caused by the short-circuited coils, which makes the motor speed more stable.
Highlights
Environmental pollution and energy shortages have become more and more serious problems.In many places, electrical power has successfully replaced the traditional energy sources
In the single-redundancy operation mode, the torque ripple generated by short-circuited coils brings the second harmonic component to the actual speed of the dual-redundancy permanent magnet synchronous motor (DRPMSM)
The proportional resonant (PR) controller is used to suppress the torque ripple generated by short-circuited coils when the DRPMSM works in single-redundancy operation mode
Summary
Environmental pollution and energy shortages have become more and more serious problems. In the parallel structure of the dual-redundancy motor, the stator has two sets of three-phase windings and shares one permanent magnet rotor [13,14,15,16,17,18,19,20,21]. Two sets of three-phase windings of the DRPMSM with weak thermal coupling and no electromagnetic coupling operate at the same time, in a dual-redundancy operation mode. The inter-turn short circuit fault offault the DRPMSM may cause output have weak thermal coupling. DRPMSM shifts into single-redundancy operation mode, the PR controller is paralleled with the proportional integral controller in the speed loop to suppress the electromagnetic torque ripple controller in the speed(PI).
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