Three-leg inverter-driven motor system, phase sequence detection method and device of motor system

Abstract

The present invention provides a three-leg inverter-driven motor system as well as a three-leg inverter-driven motor system-based phase sequence detection method and device. The system comprises a three-leg inverter and a two-phase asymmetrical motor; the two-phase asymmetrical motor comprises a main winding and an auxiliary winding; the first output end of the three-leg inverter is connected with the first end of the two-phase asymmetrical motor; the first output end of the three-leg inverter is electrically connected with the emitter of a first power switch tube and the collector of a second power switch tube; the second output end of the three-leg inverter is connected with the second end of the two-phase asymmetrical motor; the second output end of the three-leg inverter is connected with the emitter of a third power switch tube and the collector of a fourth power switch tube; the third output end of the three-leg inverter is connected with the third end of the two-phase asymmetrical motor; and the third output end of the three-leg inverter is connected with the emitter of a fifth power switch tube and the collector of a sixth power switch tube. The service life of the system can be prolonged, and the reliability of the system can be improved.

Description

technical field [0001] The invention relates to the technical field of inverters, in particular to a motor system driven by a three-leg inverter and a phase sequence detection method and device thereof. Background technique [0002] An inverter is a converter that converts direct current into alternating current, and the three-leg inverter is one of the most commonly used inverters at present. Since the inverter can output alternating current, it is widely used to drive high-power equipment such as motors. [0003] The single-phase capacitor split-phase motor is a motor that divides the single-phase voltage into two-phase voltage through the split-phase capacitor. The split-phase capacitor is a capacitor that is easy to leak, heat and break down under high voltage, so the service life is longer Short, the single-phase capacitor split-phase motor needs to provide power for other execution equipment continuously for a long time, so in the process of using the inverter to driv...

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Problems solved by technology

[0003] The single-phase capacitor split-phase motor is a motor that divides the single-phase voltage into two-phase voltage through the split-phase capacitor. The split-phase capacitor is a capacitor that is easy to leak, heat and break down under high voltage, so the service life is longer Short, the single-phase capacitor split-phase motor needs to provide power for other execution equipment continuously for a long time, so in the process of using the inverter to drive the single-phase capacitor split-phase motor, the driving signal should also be continuous, However, due to the existence of the split-phase capacitor in the single-phase capacitor split-phase motor, once the split-phase capacitor fails, the single-phase capacitor split-phase motor cannot receive the drive signal provided by the inverter, which directly affects the service life and reliability of the entire system

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