Default phase fault tolerance driving system of open winding motor

Abstract

The invention relates to a default phase fault tolerance driving system of an open winding motor. A head end and a tail end of a common three-phase motor winding are cascaded with two nominal electrical level inverters; after a fault happens in a one-phase winding open circuit, two switches on a fault phase upper bridge arm are online locked; two switching tubes of a lower bridge arm are normally driven by 1; and through the modulation of phase current reconstruction and effective redundancy switch vector reconstruction, a stable torque output is retained, the default phase fault tolerance operation of the driving system is realized and the requirements on the system continuous operation capability of the high-reliability application field such as electric automobiles are satisfied. Through the design of dual power supply, the danger of a common-mode voltage and a zero-sequence current to electric components and motors is eliminated. The device comprises a primary direct-current voltage source (1), a primary capacitor (2), a primary inverter (3), a secondary direct-current voltage source (4), a secondary capacitor (5), a secondary inverter (6), a three-phase motor (7) and a redundant switch vector (8); the primary inverter is connected to the head end of the three-phase motor winding and the secondary inverter is connected to the tail end of the motor winding.

Description

technical field [0001] The invention relates to a novel open-winding motor open-phase fault-tolerant drive system, which can be applied to some special application occasions with higher requirements for faulty operation, and belongs to the motor drive technology. Background technique [0002] Three-phase motor frequency conversion speed regulation system plays a pivotal role in industrial applications because of its superior performance. However, in industrial applications such as aerospace, locomotive traction, and even the nuclear industry, once a phase of a three-phase motor has an open-circuit fault, such as a loose terminal, a wire that is too thin to be blown, etc., if the phase is not cut off, it will lead to catastrophic damage. as a result of. In these occasions, the reliability and fault tolerance of the system are the most important indicators. It is of great practical significance to study how to continue running without stopping in the case of phase loss. Taka...

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Problems solved by technology

[0003] Technical problem: The invention proposes a motor drive system with a phase loss and fault tolerance function to solve the problem of torque ripple and Reconstruction of the remaining two-phase current and other issues, the content of the present invention is designed around the performance of a new type of open-winding motor's open-phase fault-tolerant drive system

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