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Multiphase induction motor electronic pole-changing transmission device

A technology for induction motors and transmission devices, applied in the direction of AC motor control, electrical components, control systems, etc., can solve the problems of increased motor volume, power device capacity, complex equipment, and increased volume, and achieves easy high-power transmission and wide The effect of operating range and high reliability

Inactive Publication Date: 2010-05-26
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The commonly used solution is to connect the transmission system and the load through a mechanical gearbox, and change the speed ratio of the gearbox to meet the requirements, but this method is complicated in equipment, increased in size and reduced in control accuracy; it is also possible to simply use a larger power motor And large-capacity inverter, but the size of the motor and the capacity of the power device will increase, which will cause a lot of waste in economy and energy

Method used

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  • Multiphase induction motor electronic pole-changing transmission device
  • Multiphase induction motor electronic pole-changing transmission device
  • Multiphase induction motor electronic pole-changing transmission device

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Embodiment Construction

[0014] Further illustrate the present invention below in conjunction with accompanying drawing:

[0015] refer to figure 1 , the multi-phase induction motor electronic pole-changing transmission device of the present invention includes a multi-phase induction motor 1, a multi-phase inverter 2, an inverter drive unit 3, a detection unit 4 and a pole-changing control unit 5, and the multi-phase induction motor 1 The number of phases is n≥5, and the stator winding consists of n windings whose axes are sequentially separated by 2π / n electrical angles. Each phase winding contains at least 2 kinds of space harmonic components at the same time. One end of each phase winding is star-shaped connection, multi-phase inverter The phase number of the inverter 2 is equal to the phase number n of the multi-phase induction motor 1, the output end of each phase bridge arm of the multi-phase inverter is connected to the input end of each phase winding, and the input end of the multi-phase inver...

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Abstract

The invention discloses a multiphase induction motor electronic pole-changing transmission device which comprises a multiphase induction motor, a multiphase inverter, an inversion driving unit, a detection unit and a pole-changing control unit, wherein the phase number n of the multiphase induction motor is not less than 5, a stator winding is formed by n windings the axial lines of which are arranged at intervals of 2Phi / n electrical degree in sequence, each phase winding contains at least two kinds of space harmonic components simultaneously, and a motor rotor adopts a squirrel-cage structure; the pole-changing control unit determines what kind of pole number and corresponding control freedom degree the motor adopts according to an input rotation speed signal, electric currents with different phase differences are respectively introduced to the multiphase induction motor by the multiphase inverter so as to generate rotating magnetic fields with different pole pairs in an air gap, namely, different freedom degrees can be switched so as to realize pole changing. The multiphase induction motor electronic pole-changing transmission device adopts the multiphase induction motor and a set of multiphase inverter, realizes wide-range pole-changing speed control of the transmission system, has simple winding structure and high reliability and is easy to realize large-power transmission.

Description

technical field [0001] The invention relates to a multi-phase induction motor electronic pole-changing transmission device, which is especially suitable for a high-power and wide-range speed regulation system. Background technique [0002] In many applications, such as servo systems for machine tools, aircraft drives, and flywheel energy storage systems, it is urgently required that the transmission system not only provide large torque at low speeds, but also have a wide operating range of constant power speed regulation. Traditional induction motors The constituted AC drive system works in constant torque mode below the rated frequency, and in constant power mode above the rated frequency. In the constant power mode, the voltage at the motor terminal increases slowly with the increase of the frequency. When the voltage reaches the maximum voltage that the frequency converter can provide in the case of power supply by the frequency converter, the transmission system cannot c...

Claims

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Application Information

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IPC IPC(8): H02P25/20H02P27/06
Inventor 杨家强黄进康敏陈高刘东
Owner ZHEJIANG UNIV
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