Torque Ripple Suppression Control of Bearingless Brushless Dc Motor in Wide Speed Regulation Range

Abstract

Abstract-Bearingless brushless DC (BBLDC) motor in the flywheel energy storage system has advantages of low energy consumption, high critical speed and better speed adjustment performance. However, torque ripple exists inevitably due to the current commutation of the BBLDC motor and the wide range of speed changes when the flywheel energy storage system charges and discharges. In this frame, an approach of combining the direct torque control (DTC) with the current prediction control (CPC) is proposed to suppress torque ripple in wide speed regulation range. In this paper, the mathematical model of the BBLDC motor is given, and the principle of DTC scheme is introduced. On the basis of analyzing the causes of commutation torque ripple when using DTC scheme, CPC scheme is employed to minimize the commutation torque ripple by controlling the changes of phase current during commutation. During the non-commutation, the DTC is selected, and the CPC is selected during the commutation. Results show that the proposed approach is feasible, and torque ripple is effectively suppressed both in high speed and low speed. Moreover, this method has no effect on the suspension performance.

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“…The BBLDC motor has two sets of windings in the single stator tooth: one for the motor electromagnetic torque generation and the other for rotor levitation force generation [9]. The single tooth concentrated coils cause highly nonlinear coupling between the electromagnetic torque and suspension force generation [7]. Figure 1(a) presents the winding arrangement for BBLDC motor.…”

“…The primary purpose of this research was to achieve decoupled control of the motor speed and magnetic suspension force. A BBLDC motor with torque ripple suppression control was presented by Sun et al [7]. A direct torque control with current prediction control was used to achieve this goal.…”