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Apparatus for switching windings of AC three-phase motor

A technology for switching AC motors and windings, applied in AC motor control, DC motor speed/torque control, motor control in four quadrants, etc., can solve problems such as obstacles to practical application, large number of active semiconductor components, and increased cost , achieve the effect of shortening time, realizing miniaturization and cost reduction, strengthening insulation

Inactive Publication Date: 2005-01-12
YASKAWA DENKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large number of necessary active semiconductor elements, the increase in cost has become a major obstacle to practical application

Method used

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  • Apparatus for switching windings of AC three-phase motor
  • Apparatus for switching windings of AC three-phase motor
  • Apparatus for switching windings of AC three-phase motor

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Effect test

Embodiment Construction

[0037] Embodiments of the present invention will be described below with reference to the accompanying drawings. figure 1 It is a basic circuit configuration diagram of the first embodiment of the present invention. exist figure 1 Among them, 1 is an inverter unit that becomes a variable-frequency variable-voltage power supply for 3-phase motor control, and is composed of main circuit transistors Q1 to Q6. The terminals TP and TN are connected to the DC output terminals of the converter. 2 is an AC motor, and 12 is a winding switching part. Each phase winding of the motor 2 is formed by two coils, and intermediate terminals TU3 , TV3 , and TW3 connecting these coils are taken out as external terminals of the motor. One end TU2 , TV2 , TW2 of the winding terminals of each phase of AC motor 2 is connected to output terminals TU1 , TV1 , TW1 of each phase of inverter unit 1 .

[0038] The other ends TU4 , TV4 , TW4 of the winding terminals of the respective phases of the AC...

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Abstract

It is an object to provide a winding switching device of a three-phase AC motor having a small size at a low cost in which a time required for switching a winding is shortened and the number of semiconductor switch units is decreased as much as possible. In a winding switching device of a three-phase AC motor including an AC motor in which a winding having each phase is formed by a plurality of windings and a connecting terminal connecting the windings to each other and both terminals of the winding having the phase are provided on an outside of a motor, winding switching means for properly switching the connecting terminal, and a variable frequency power source for supplying a variable voltage having a variable frequency to the AC motor, the winding switching means is constituted by a plurality of three-phase rectifying means connecting one of ends of the winding having the phase to the variable frequency power source and connecting the other end and the connecting terminal to an input terminal on an AC side of the three-phase rectifying means for each phase, and a semiconductor switch provided to open and close both ends on a DC output side of the three-phase rectifying means.

Description

technical field [0001] The present invention relates to a winding switching device of a 3-phase AC motor that expands the range of speed control by switching the windings of the 3-phase AC motor. A wide range of industry fields of the device are targeted. Background technique [0002] In the main shaft of a machine tool driven by an AC variable frequency power supply and a drive device of a vehicle, a winding switching method is used as a method for obtaining a sufficiently large torque in a low speed range while realizing operation in a high speed range. [0003] Image 6 The shown star-delta switching method is an example widely used in the spindle drive of machine tools and the like. Image 6 Among them, 22 is a power supply, 16-21 are diodes constituting a 3-phase full-wave rectifier bridge, and 15 is a smoothing capacitor. 14 is a converter unit that converts the AC power supply 22 into a DC power supply. Terminals TP and TN are DC output terminals of converter unit 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/06H02P23/06H02P23/07H02P25/022
CPCH02P25/188H02P23/06H02P27/06
Inventor 久米常生斯瓦米·马赫什
Owner YASKAWA DENKI KK
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