Four-bridge-arm fault-tolerant system of brushless direct current motor inverter and control method thereof

Abstract

The invention relates to a four-bridge-arm fault-tolerant system of a brushless direct current motor inverter and a control method of the four-bridge-arm fault-tolerant system. The system comprises abrushless direct current motor, a first bridge arm, a second bridge arm and a third bridge arm which are connected in parallel, and the four-bridge-arm fault-tolerant system further comprises a fourthbridge arm, a first switch assembly, a second switch assembly and a third switch assembly. The fourth bridge arm is connected with the A phase of the brushless direct current motor through the firstswitch assembly, is connected with the B phase of the brushless direct current motor through the second switch assembly, is connected with the C phase of the brushless direct current motor through thethird switch assembly and is connected with the first bridge arm in parallel. Compared with the prior art, corresponding system reconstruction is carried out for faults of different power tubes, thereconstructed current forms a new loop through the redundant power tubes, the output performance of the motor is not influenced, and the control mode for driving the inverter is not influenced.

Description

technical field [0001] The invention relates to the field of brushless DC motor control, in particular to a four-arm fault-tolerant system of a brushless DC motor inverter and a control method thereof. Background technique [0002] In order to ensure the safe operation of motors, high fault-tolerant control systems have become a research hotspot in recent years. The fault-tolerant control system technology is divided into two categories: one is fault-tolerant control by software, and the other is formed by hardware fault-tolerant topology combined with corresponding software fault-tolerant control strategies. fault-tolerant system. This method is a strategy commonly used in fault-tolerant control at present, and is the mainstream trend of fault-tolerant research. Based on different fault-tolerant topologies combined with the corresponding control of the software, the reconstruction of the system is completed to make the motor run normally. [0003] In the driving system of...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the existence of the power converter in the above-mentioned prior art as the most prone to failure unit in the brushless DC motor, which will greatly affect the safety of the system; for this failure phenomenon, existing solutions exist To provide a four-leg fault-tolerant system and control method for a brushless DC motor inverter due to the defects of complexity, difficulty in implementation, and high cost

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