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Friday 5 March 2021

An Incorporated Control Strategy of Commutation and Conduction Torque Ripples Mitigation for BLDCM Drives in Household Appliances

 ABSTRACT:

In this paper, an incorporated control strategy of both commutation and conduction torque ripples mitigation for brushless DC machine (BLDCM) with the sinusoidal back electromotive force(EMF) is proposed to reduce the vibration and noise of household appliances for higher comfortable capability. Based on the combined torque ripple analysis with respect to the stator flux linkage trajectory, a three-phase voltage vector injection (TVVI) method is designed and implemented in the commutation interval to compensate the sharp dips of the stator _ux trajectory for the mitigation of the commutation torque ripple, and duty cycle of the injected voltage vector could be regulated automatically. Then, a simple direct power control (DPC) method with TVVI in the PWM modulation is employed as inner-loop for BLDCM to obtain the desired waveforms of currents with the speci_c dc-link current sampling method, and the reduction of both conduction and commutation torque ripples is achieved. The proposed incorporated control strategy is validated through simulation experiment results, and the effect on the torque ripples are compared with the traditional approaches.

KEYWORDS:

1.      Incorporated control strategy

2.      Commutation and conduction torque ripples mitigation

3.      Direct power control

4.      Three-phase voltage vector injection

5.      Stator flux trajectory

 SOFTWARE: MATLAB/SIMULINK

 CONCLUSION:

In this manuscript, an incorporated control strategy of commutation and conduction torque ripples mitigation for BLDCM with the sinusoidal back EMF in household appliances is proposed. Unlike the conventional separated analysis of the commutation and conduction torque ripples, a combined torque ripples analysis depending on the stator flux linkage trajectory is introduced. A three-phase voltage vector injection(TVVI) method is designed and implemented in the commutation interval to compensate the sharp dips of the stator _ux trajectory for the mitigation of the commutation torque ripple, then, a simple DPC is employed as inner-loop with the specific dc-link current sampling method to replace the traditional current-loop, and the desired waveforms of currents could be obtained for the conduction torque ripple mitigation. Moreover, the TVVI and DPC control schemes are combined together to achieve the torque ripples of less than 0.1Nm, which is only 12.5% of that in the traditional current-loop control method. From the results of the comparison tests, the proposed method ensures a signicant reduction of the commutation and conduction torque ripple for BLDCM with the low-cost property, and the effectiveness and feasibility have been extended to the other PWM patterns and wide speed range. Thus, BLDCM with the improved higher torque performance can also be applied to the other applications, where, the cost and torque ripples are of great concern.

 REFERENCES:

[1] R. Carlson, M. Lajoie-Mazenc, and J. C. D. S. Fagundes, ``Analysis of torque ripple due to phase commutation in brushless DC machines,'' IEEE Trans. Ind. Appl., vol. 28, no. 3, pp. 632_638, May 1992.

[2] Y.-K. Lin and Y.-S. Lai, ``Pulsewidth modulation technique for BLDCM drives to reduce commutation torque ripple without calculation of commutation time,'' IEEE Trans. Ind. Appl., vol. 47, no. 4, pp. 1786_1793, Jul./Aug. 2011.

[3] J. Shi and T.-C. Li, ``New method to eliminate commutation torque ripple of brushless DC motor with minimum commutation time,'' IEEE Trans. Ind. Electron., vol. 60, no. 6, pp. 2139_2146, Jun. 2013.

[4] F. Yang, C. Jiang, A. Taylor, H. Bai, A. Kotrba, A. Yetkin, and A. Gundogan, ``Design of a high-ef_ciency minimum-torque-ripple 12-V/1-kW three-phase BLDC motor drive system for diesel engine emis- sion reductions,'' IEEE Trans. Veh. Technol., vol. 63, no. 7, pp. 3107_3115, Sep. 2014.

[5] C. K. Lad and R. Chudaman, ``Simple overlap angle control strategy for commutation torque ripple minimisation in BLDC motor drive,'' IET Electr. Power Appl., vol. 12, no. 6, pp. 797_807, Jul. 2018.