A Novel Voltage-Boosting Modulation Strategy to Reduce DC-Link Capacitance for Brushless DC Motor Drives

Li, Xinmin; Yuan, He; Yan, Yan; Chen, Wei; Zhang, Guozheng; Shi, Tingna; Xia, Changliang

doi:10.1109/tpel.2022.3197444

Cited by 8 publications

(1 citation statement)

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“…For the BLDCM drive with a single-phase rectifier, the dc-link circuit using a small capacitor in series with the IGBT scheme is mentioned in references [12][13][14], and the topology circuit diagram of the brushless DC motor system with the small capacitor is shown in Figure 1. In reference [14], based on the topology circuit of Figure 1, in each rectification cycle, when the capacitor voltage rises to the maximum value of the ac supply voltage, the capacitor charging vectors are applied at the same time, which will further increases the capacitor voltage, so that the motor input energy is not affected even if the dc-link capacitance is reduced.…”

Section: Introductionmentioning

confidence: 99%

Overvoltage Avoidance Control Strategy for Braking Process of Brushless DC Motor Drives with Small DC-Link Capacitance

Chen,

Wu,

et al. 2024

Actuators

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Single-phase input rectifier brushless DC motor drives with a small film capacitor have many advantages, such as high power density and high reliability. However, when the motor system operates in regenerative braking mode, the dc-link capacitor with reduced capacitance may suffer from overvoltage without adding additional hardware circuits. At the same time, the braking torque control of the motor will be affected by speed variations. In order to ensure smooth and reliable operation of the motor system, an anti-overvoltage braking torque control method is proposed in this article. The relationship among the dc-link capacitance, the dc-link capacitor voltage, and the speed during regenerative braking is analyzed quantitatively, and the speed at which the regenerative braking is switched to the plug braking is obtained, which in turn consumes the capacitor energy to avoid dc-link overvoltage. Additionally, based on the relationship between the controllability of the braking torque and the speed, a reference value of the braking current that matches the speed is designed. The proposed method makes use of the capacitor’s energy storage during regenerative braking. Meanwhile, it mitigates the impact of motor speed on braking torque. Finally, the effectiveness of the proposed method is verified on a motor platform equipped with the dc-link film capacitor.

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