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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

Inactive Publication Date: 2005-12-07
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a squirrel-cage asynchronous motor composed of multiple star-shaped windings, the situation is much more complicated than that of a generator

Method used

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  • Inverter feed multi three-phase squirrel-cage asynchronous motor
  • Inverter feed multi three-phase squirrel-cage asynchronous motor
  • Inverter feed multi three-phase squirrel-cage asynchronous motor

Examples

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Embodiment Construction

[0053] In the accompanying drawings, Figure 5-Figure 6 It is an embodiment of multi-three-phase squirrel-cage asynchronous motor. Figure 5-Figure 6 In a multi-three-phase system, the slot potential star diagram of the 4×3-phase stator winding is used. It can be seen from the slot potential star diagram that the 4×3 phase system includes 4 sets of three-phase symmetrical windings. In this embodiment, the number of stator slots of the squirrel-cage asynchronous motor is Z=144, and the number of magnetic poles 2p=8. The number of slots per pole phase is q=1.5, and the pole distance τ=18. Since the power of multi-phase motors is generally large, it is common to use double-layer windings. This embodiment can also use single-layer windings. The winding pitch can be full-pitch winding y=τ, or short-pitch winding y = 8 9 τ = 16 (groove). The space electrical angle between adjacent inde...

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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).

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K17/12
Inventor 王晓雷
Owner ZHONGYUAN ENGINEERING COLLEGE
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