Two-phase short-circuit fault location and fault-tolerant operation control method for brushless DC motor

Abstract

The invention discloses a two-phase short-circuit fault locating and fault-tolerant operation controlling method for a brushless DC motor, comprising the steps of: 1.acquiring and transmitting three-phase current data; 2. analyzing and processing the three-phase current data and locating two-phase short-circuit fault of the brushless DC motor; 3.using a microprocessor module to perform four-step commutation and fault-tolerant operation control on the brushless DC motor according to the two-phase short-circuit fault locating result. The method has the advantages of simple steps, convenient implementation and high accuracy, and can carry out fault locating in a short time. The fault-tolerant operation controlling method can ensure that the brushless DC motor still operates stably and reliably after the two-phase short-circuit fault of a winding, and effectively improves the reliability and stability of the brushless DC motor system. The fault-tolerant operation controlling method has excellent practicality and good effects, and easy to popularize.

Description

technical field [0001] The invention belongs to the technical field of brushless direct current motor control, and in particular relates to a two-phase short-circuit fault location and fault-tolerant operation control method of a brushless direct current motor. Background technique [0002] Brushless Direct Current Motor (BLDCM) has become the first choice for actuators of power-by-wire systems in the aerospace field due to its simple structure, high power and torque density, light weight, and high efficiency. BLDCM is a key executive component of the fly-by-wire system. Once it fails, it will threaten flight safety. In order to improve its reliability, research on BLDCM system redundancy and fault-tolerant technology is being carried out extensively at home and abroad. [0003] The research of BLDCM redundant and fault-tolerant control system mainly revolves around three aspects: drive circuit, motor structure and control strategy. For example, He Hucheng and others publis...

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Problems solved by technology

For example, He Hucheng and others published the paper "Research on New Three-phase Fault-Tolerant Inverter" in the journal "Power Automation Equipment" in Volume 35, Issue 05 in 2015, and Kai Ni et al. The paper "Yu.Rotor-side converter reconfiguration using four-switch three-phasetopology in dfigwt for fault-tolerant purpose" was published at IEEETransportation Electrification Conference (ITEC) (Transportation Electrification Conference) Rotor-side converter reconstruction of four-switch three-phase topology), two kinds of fault-tolerant inverter topologies of BLDCM speed control system are proposed. Switching to open-circuit faults for processing, and enabling the standby bridge arm for fault-tolerant control, can achieve short-circuit fault-tolerant control, but increases the cost of the driver, and the response time of the fuse is at the millisecond level, making it difficult to protect in time; for example, Haisong et al. in 2014 in China The paper "Research on a four-phase fault-tolerant PMSM used for EVs" was published at the IEEEInternational Conference On Electrical Machines and Systems (ICEMS) (International Conference on Motors and Systems) in Hangzhou ), Li Zhang and others published the paper "Design and Analysis of a New Five-Phase Brushless Hybrid-Excitation Fault- Tolerant Motor for Electric Vehicles" (design and analysis of a new five-phase brushless excitation fault-tolerant motor for electric vehicles), Yong Chen and others at the IEEE Prognostics and System Health Management Conference (PHM) (Prediction and System Health Management Conference) in Chengdu, China in 2016 Published the paper "Design and analysis of six-phase fault-tolerant PMSM for electric vehicle" ( Design and analysis of six-phase fault-tolerant permanent magnet synchronous motor for electric vehicles), proposed a four-phase, five-phase, six-phase winding BLDCM redundant fault-tolerant control method, and enabled the fault-tolerant operation of the backup winding after a fault, in the case of a short circuit between turns or windings of the motor Capable of fault-tolerant operation, but increases the complexity of the motor structure

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