Inverter feed multi three-phase squirrel-cage asynchronous motor

A technology for asynchronous motors and inverters, applied in the direction of asynchronous induction motors, DC motor speed/torque control, electrical components, etc., can solve problems such as the complexity of generators, and achieve improved torque characteristics, harmonic weakening, and reliability sex enhancing effect
CN1705205AInactive Publication Date: 2005-12-07ZHONGYUAN ENGINEERING COLLEGE
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
ZHONGYUAN ENGINEERING COLLEGE
Publication Date
2005-12-07
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

This invention refers to more three-phase ac squirrel-cage asynchronous motor power supplied by inverter, which contains plurality of groups of three-phase symmetry windings independent in circuit, there is only magnetic circuit coupling among groups without direction relation in electric circuit, the each star connected three-phase windings has independent zero point, the angle connected windings is independent, the total windings phases are multiple times of three, e.g. 2X3, 3X3...NX3 (n is the positive integer greater than 2).
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Description

Technical field:

[0001] The invention relates to a multi-three-phase AC squirrel-cage asynchronous motor powered by an inverter. Background technique:

[0002] Large-scale three-phase AC squirrel-cage asynchronous motors are generally used in industrial loads such as large-scale fans, water pumps, and compressors. At present, it is more common to directly connect to the power frequency grid for constant-speed operation. When this type of three-phase motor needs to be powered by an inverter for variable speed operation, conventional three-phase AC-AC or AC-DC-AC frequency conversion devices are generally used, and traditional multi-phase motors and multi-phase frequency conversion devices are also used. However, the conventional high-power AC squirrel-cage asynchronous motor system powered by a three-phase inverter often requires multiple power semiconductor devices Current problems, or use a multi-level cascaded structure to solve the problem of passing high voltage on a th...

Claims

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