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Inverter feed multi three-phase AC synchronous motor

A synchronous motor, three-phase synchronous technology, applied to synchronous motors for single-phase current, DC motor speed/torque control, electrical components, etc., can solve the problems of complex generators, and achieve simple wiring and reliable windings. High performance and reliability

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

AI Technical Summary

Problems solved by technology

For a motor composed of multiple star windings, the situation is much more complicated than that of a generator

Method used

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  • Inverter feed multi three-phase AC synchronous motor
  • Inverter feed multi three-phase AC synchronous motor
  • Inverter feed multi three-phase AC synchronous motor

Examples

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Embodiment Construction

[0050] Instructions attached Figure 5 It is an embodiment of multiple three-phase synchronous motors. Figure 5 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 synchronous motor is Z=72, the number of magnetic poles is 2p=6, and each pole is The number of phase slots is q=1, and the pole pitch τ=12. Since the power of multi-phase motors is generally large, it is more 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 = 5 6 τ = 10 (groove). The space electrical angle between adjacent independent three-phase windings is 180° / (4×3)=15°...

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Abstract

This invention refers to a more three-phase ACS motor adopting inverter to supply power to rotor, which contains said rotor is three-phase and connected with electric network and has plurality of group 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 positive integer greater than 1), the phase difference between adjacent phase in dependent three-phase is 120 degree, the displacement angle can adopt 360 degree / (nX3), 180 degree / (nX3), or 0<=beta<180 degree / (nX3), the inverter is a special structure combination of multiple phase inverter, the corresponding phase difference in adjacent three-phase windings is Pi / (nX3).

Description

Technical field: [0001] The invention relates to a multiple three-phase AC synchronous motor powered by an inverter. Background technique: [0002] Three-phase AC synchronous motors are generally used in loads such as large fans, water pumps, compressors, and rolling mills. At present, it is more common to directly connect to the power frequency grid to operate at a constant speed. 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, due to the limitations of the physical parameters of the power semiconductor devices in the conventional high-power AC synchronous motor system powered by three-phase inverters, it is often necessary to use multiple power semiconductor devices in parallel to solve the problem of passing large currents on a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K19/10
Inventor 王晓雷
Owner ZHONGYUAN ENGINEERING COLLEGE
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