Hybrid excitation fault tolerant motor system based on automatic position detection

Abstract

The invention discloses a hybrid excitation fault tolerant motor system based on the automatic position detection. The system comprises a stator, a rotor, permanent magnets, armature teeth, fault tolerant teeth, armature coils and excitation coils. The armature coils are winded on the armature teeth, the excitation coils sleeve the fault tolerant teeth of the stator, the permanent magnets are embedded in the rotor and form the permanent magnetic field, and all the excitation coils form an electric excitation magnetic field; each permanent magnet comprises two magnetic stripes which are symmetrical about the rotor radially and which are assembled at one end adjacent to the axis of the rotor, and a pair of permanent magnetic poles in the rotor are provided with one or multiple grooves along the q-axis magnetic circuit direction to form one or multiple magnetic isolation layers. Compared with a traditional permanent magnet synchronous motor, the system has the advantages that the magnetic isolation layers are increased along the q-axis magnetic circuit direction in the rotor, the zero low-speed operation without the position sensor control can be implemented, the reliability and fault tolerance capability of the motor drive system are further improved, and the torque output of the motor can be further increased.

Description

technical field [0001] The invention relates to a motor, in particular to a hybrid excitation fault-tolerant motor based on position self-detection. Background technique [0002] The built-in permanent magnet synchronous motor has the advantages of large torque output, wide speed range, high power density and high efficiency, and has been widely used in many high-performance drive fields. In the high-performance drive fields such as new energy electric vehicles, wind power generation and aerospace, high requirements are placed on the reliability of the drive system. The current conventional built-in permanent magnet synchronous motor still has the problem of permanent magnet demagnetization and excitation adjustment difficulties, and does not consider the fault-tolerant performance of the motor, which cannot meet the system reliability requirements and fault-tolerant operation capability. [0003] In addition, in realizing the high-performance control of the motor drive sys...

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Problems solved by technology

[0003] In addition, in realizing the high-performance control of the motor drive system, it is often necessary to use position sensors to accurately detect the position and speed signals of the motor, but the installation of additional position sensors not only increases the cost of the control system, but also reduces the reliability of the system. sex

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