Household electric washing machine driven via power electronic circuit

Abstract

This invention relates to power electronic circuit drive household electric machine in which, the source from the network controlled or modulated by the said circuit drives motors characterizing in that the said motor is two-phase symmetric with space phase difference pai / z angle, the power source is divided into two branches, one provides voltage to one phase winding of the motor, the other is modulated to a voltage with the same wave, frequency and amplitude and 1 / 4 preriodic phase difference to that provided by two-way thyristor circuit, providing the other phase wniding.

Description

technical field [0001] The invention relates to a washing machine driven by a power electronic circuit, in particular to a household electric washing machine driven by a power electronic circuit. Background technique [0002] In a traditional household electric washing machine driven by a power electronic circuit, the power from the grid is controlled or modulated by the power electronic circuit to drive the motor. Among them, the bidirectional thyristor circuit was first used due to its simplicity, reliability and low price, and it is still used today. It drives a single-phase capacitor motor and shows the advantages of an electronic switch circuit in replacing the previous contact switch circuit, but fails to improve the drive performance of the motor, especially the noise, efficiency and speed regulation performance. Variable frequency drive is a better quality motor speed regulation method. In order to improve the performance, in recent years, the washing machine has d...

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Problems solved by technology

[0006] 1. The inverter circuit of the bridge type 6 units is obviously complicated, which is the weak link of the system. Usually, it is necessary to select relatively good unit components or set up more complicated protection circuits, and even use relatively expensive intelligent power modules (IPM), etc., for Washing machine, obviously affects the cost

[0007] 2. For the induction motor, compared with the previous single-phase motor, the three-phase motor needs one more slot in the stator, and the slots appear to be more; the winding has one more phase plane, and the embedding becomes complicated; the motor used to manufacture washing machines in the past The two-phase automatic wire embedding equipment cannot be used, which affects the cost

The permanent magnet brushless motor is a new type of motor adapted to the introduction of power electronic circuit drive. The structure and process are more complicated than the induction motor, and the cost is also high.

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