Frequency varying driven washer

Abstract

The present invention relates to a frequency-variable driven washing machine, which is characterized by that in said washing machine the electric network power supply is converted into variable frequency and two-phase power source whose time lag is equal to 1/4 cycle to drive two-phase symmetrical winding motor of space phase difference Pi/2 electric angle. Its one technical scheme is as follows: electric network power source is converted into variable frequency power source by means of rectifying-filtering circuit and inversion circuit, its rectifying-filtering circuit is formed from positive half-wave rectification filtering circuit and negative half-wave rectification filtering circuit and has a common end with power supply circuit of electric network, and its inversion icrcuit is double half wave 4 unit, and its uses existent washing machine motor. It possesses the excellent performance of symmetrical motor, and its structure is simplified and cost is reduced.

Description

technical field [0001] The invention relates to a washing machine driven by frequency conversion. Background technique [0002] In the washing machine, power from the grid is converted into variable frequency power, which drives the electric motor. Variable frequency drive is a better quality motor speed regulation method. In order to improve the performance, in recent years, the washing machine has developed from a single-phase motor driven by a fixed frequency to a three-phase motor driven by a variable frequency. Chinese patent application number: 98104171, publication number: CN1191909A, applicant: Samsung Electronics Co., Ltd. proposes to establish a single-phase variable frequency power supply for washing machines to drive conventional single-phase capacitor running motors. This method is relatively simple, but because the state of the phase circuit of a single-phase capacitor-operated motor cannot be kept symmetrical, and it will cause a bad offset due to the power ...

AI Technical Summary

Problems solved by technology

[0005] 3. The inverter circuit is bridge type 6 units

[0007] 1. The number of units in the inverter circuit is too large, which is the main factor affecting the cost

[0008] 2. For induction motors, compared with the previous single-phase motors, the three-phase motors require one more phase of slots, and the slots appear to be more; the windings have one more phase plane, and the embedded wires become more complicated; the motors used to manufacture washing machines in the past The two-phase automatic wire embedding equipment cannot be used, which affects the cost

Usually, it is necessary to select better unit components, or set up more complex protection circuits, or even use higher-priced intelligent power modules (IPMs), etc. For washing machines, the cost will be significantly affected

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