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| Novel Torque Modulation Method for Switched Reluctance Motor Based on Current Squared Constraints |
| Sun Qingguo1,2, Lü Guangyu1,2, Liu Xu1,2, Li Shanhu1,2, Niu Feng1,2 |
1. State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin 300401 China;
2. Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology Tianjin 300401 China |
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Abstract Due to the doubly-salient structure of switched reluctance motors (SRMs), the torque ripple problem always exists and limits the promotion of SRMs. The existing schemes usually rely on a large amount of motor electromagnetic characteristic data to suppress torque ripples during the operation process, which takes up a lot of controller storage space and complicates the control program. In contrast, the schemes independent of the data have an inefficient effect on torque ripple suppression in common. This paper proposes a novel torque modulation method for switched reluctance motors based on current squared constraints to reduce torque ripples and alleviate the dependence on electromagnetic characteristic data during the control process.
Firstly, the effect of the first-order current squared on torque generation is derived based on the instantaneous torque equation of the switched reluctance motor. It is found that the main torque ripple component is the triple frequency torque. Then, the influence of the second-order current squared is analyzed, and the constraint conditions for offsetting the triple frequency torque component are obtained through the synergistic effect of the first-order and the second-order current squared. The extreme point determination method is used to determine the optimal operating state of the current squared, ensuring the numerical value of the current squared is the lowest and positive. Finally, the instantaneous torque compensation method is proposed to suppress the error torque ripple in the specific position regions for each phase.
Experimental verifications are conducted on a 150 W, three-phase, 12/8-pole switched reluctance motor. The torque performance of four schemes is compared: current chopping control, dc-biased sinusoidal-wave excitation, scheme with only the first order current squared acting, and the proposed whole scheme. In the speed range from 300 r/min to 1 500 r/min, the dc-biased sinusoidal-wave excitation has the largest torque ripple because the sinusoidal current waveform excitation scheme for the common alternating current motors is not an effective solution. With speed increasing, the current chopping control scheme has the largest torque ripple increment with no specific control target for the instantaneous torque or current. When only the first-order current squared acts, the torque ripple is large because the second-order and fourth-order inductance harmonics generate the triple-frequency torque component. The proposed scheme has the lowest torque ripple since the largest torque ripple component is offset, and the error torque ripple is compensated.
The contributions of the proposed novel torque modulation method for switched reluctance motor are as follows: (1) The effects of the current squared and inductance harmonics on the torque generation are analyzed. (2) The torque ripple out of the featured position regions can be suppressed combined with the first-order and the second-order current squared. (3) The proposed instantaneous torque compensation method compensates for the torque ripple in the featured position regions. (4) The reliance on electromagnetic characteristic data during the control process is reduced.
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Received: 12 January 2024
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2024, Vol. 39 
