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Control device and control method for alternating current motor, and alternating current motor driving system

一种交流电动机、控制装置的技术，应用在交流电动机控制、控制系统、矢量控制系统等方向，能够解决基波电压限制等问题

Active Publication Date: 2019-06-11
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the fundamental wave voltage that the inverter can output is limited by the DC power supply voltage

Method used

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  • Control device and control method for alternating current motor, and alternating current motor driving system
  • Control device and control method for alternating current motor, and alternating current motor driving system
  • Control device and control method for alternating current motor, and alternating current motor driving system

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Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0044] use Figures 1 to 8 , the first embodiment of the present invention will be described.

[0045] figure 1 The configuration of the control device for the AC motor according to the first embodiment of the present invention is shown.

[0046] like figure 1 As shown, the present embodiment includes: an inverter 3 that applies three-phase AC power to a three-phase permanent magnet synchronous motor (hereinafter, simply referred to as a “PM motor”) 4 to drive the PM motor 4; and a controller 2 that is based on The torque current command Iq* output from the Iq* generator 1 controls the inverter 3 . The inverter 3 includes a DC power supply 31 and an inverter main circuit 32 that converts the DC power of the DC power supply 31 into three-phase AC power and outputs the power to the PM motor 4 .

[0047] When the three-phase voltages Vu, Vv, Vw output from the inverter are applied to the PM motor 4, the PM motor 4 is rotationally driven by the magnetic force between the rotat...

no. 1 approach

[0105] As described above, according to the first embodiment of the present invention, it is possible to obtain high controllability and low noise in the overmodulation control of the control device of the AC motor.

no. 2 Embodiment approach

[0107] Figure 9 The configuration of the voltage limiting unit 10B of the control device for the AC motor according to the second embodiment of the present invention is shown. The voltage limiting unit 10B has the same figure 1 The voltage limiting section 10 has a different configuration. In addition, the configurations other than the voltage limiting unit 10B are the same as figure 1 The first embodiment shown is the same. Hereinafter, differences from the first embodiment will be described.

[0108] like Figure 9 As shown, the voltage limiting unit 10B includes a voltage corrector 104 that performs voltage correction on the voltage command amplitude V1 , which is the output of the polar coordinate converter 101 . The voltage corrector 104 corrects V1 based on the nonlinearity of the relationship between the voltage command amplitude (V1) in the overmodulation region and the output voltage of the inverter 3, that is, the voltage actually applied to the motor (V1M). I...

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PUM

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Abstract

The present invention enables an over-modulation control with high controllability and low noise. This control device for an alternating current motor is provided with: an inverter 3 which drives an alternating current motor 4; and a controller 2 which controls the inverter 3 by means of pulse width modulation, wherein, when controlling the inverter 2 by over-modulation, the controller 2 limits, to a prescribed upper limit value or lower, the amplitude of a voltage command in the pulse width modulation.

Description

technical field [0001] The invention relates to a control device and a control method of an AC motor for overmodulating an inverter that drives the AC motor, and an AC motor drive system. Background technique [0002] In the fields of home appliances, industry, and automobiles, motor drive devices are used for rotational speed control of fans, pumps, and compressors, positioning control of transporters and elevators, and torque control of electric power steering. In motor drive devices in these fields, a permanent magnet synchronous motor (hereinafter, referred to as a "PM motor"), which is a small and high-efficiency alternating current motor, is widely used. [0003] In the PM motor, the magnetic flux required to generate torque is generated by the magnetic flux of the permanent magnet attached to the rotor. Thereby, the current for generating the magnetic flux is not required, and the copper loss is greatly improved, so the PM motor has high efficiency. [0004] The eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/08H02M7/48
CPCH02P27/08H02M7/48H02P21/02F04B17/03H02P27/085
Inventor 岩路善尚冈本直树羽野诚己梅津岳
Owner HITACHI ASTEMO LTD