Two-phase short-circuit fault locating and fault-tolerant operation controlling 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

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