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Driving apparatus for a motor

A technology for driving devices and electric motors, applied in the direction of controlling electromechanical transmission devices, motor generators/starters, motor generator control, etc. common reducing effect

Active Publication Date: 2009-03-25
HITACHI IND PROD LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, if the magnetic flux command is increased, the magnetic flux of the motor will be saturated, the actual magnetic flux will not be generated according to the command, and there may be cases where high torque cannot be generated.

Method used

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  • Driving apparatus for a motor
  • Driving apparatus for a motor
  • Driving apparatus for a motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017]

With reference to FIG. 1 , the motor drive device according to this embodiment will be described for the parts different from the conventional art shown in FIG. 8 . The first torque command is calculated by the speed control unit 11, and by the torque command calculation unit 31, according to the speed command value ωr * Calculate the second torque command. The synthesis of the first torque command and the second torque command is called torque command τ * . In the speed control output correction part 32, the output of the speed control part 11 is reduced to zero at the time of starting. Therefore, according to the speed command value ωr at startup * Computational torque command τ * , and the field current command value Id is calculated by the current command calculation unit 13 * , Torque current command Iq * . In addition, the term "starting" means the period during which the speed of the motor changes from 0 to rotation, and the term "after starting" means t...

Embodiment 2

[0023]

Regarding the present embodiment, differences from the first embodiment will be described using FIG. 2 . In the first embodiment, instead of the torque command calculation unit 31 in FIG. 1 , a speed estimation value correction unit 34 is designed to lower the speed estimation value at the time of starting. Thus, the speed control unit 11 only uses the speed command value ωr * The control is the same as in Embodiment 1, according to the speed command value ωr * , to calculate the excitation current command Id * , Torque current command Iq * , frequency command value ω1 * , so it is not affected by the speed estimation error, etc., and the desired torque can be generated at the time of starting.

Embodiment 3

[0024]

Regarding this embodiment, differences between Embodiment 1 and Embodiment 2 will be described using FIG. 3 . The result obtained by multiplying the output of the slip calculating unit 17 by k by the slip speed correcting unit 35 is used as the slip speed, and the sum frequency command value ω1 is obtained. * The difference, the calculation speed estimated value ωr^. k is 0 or more and less than 1 at the time of starting, but k returns to 1 when the predetermined speed is reached as described in Embodiment 1 after the motor is started. Thereafter, the output of the speed control output correction unit 32 is returned from 0 to the output value of the speed control unit 11 , and the outputs of the torque command calculation unit 31 and the frequency correction unit 33 are decreased to 0. Judgment during startup and after startup is the same as in Embodiment 1. In this embodiment, use (Equation 9) to find the frequency command value ω1 * .

[0025]

ω1 * =ωr * +ωs...

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PUM

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Abstract

A motor driving apparatus includes: a current instruction calculator, for calculating a current instruction value based on a deviation between a speed instruction value and an estimated speed value; a current controller, for controlling an output current based on the current instruction value; a frequency instruction calculator, for calculating a frequency instruction value based on an output voltage instruction value or an output voltage detection value, wherein, when an induction motor is to be activated, the current instruction value and the frequency instruction value are calculated directly using the speed instruction value, and an output current and an output frequency are controlled in accordance with the current instruction value and the frequency instruction value.

Description

technical field [0001] The present invention relates to a motor drive device for realizing variable-speed operation of an induction motor, and more particularly to a drive device capable of outputting high torque when the motor is started. Background technique [0002] In recent years, variable-speed drive of electric motors consisting of inverters has been developed for energy-saving measures to prevent global warming and to improve the efficiency of production equipment. FIG. 8 shows an example of a conventional technique for controlling an induction motor. In Fig. 8, the estimated speed value ωr^ and the speed command value ωr * In the same way, the torque command τ is calculated by the speed control unit 11 * , and the magnetic flux command Φ from the magnetic flux command computing unit 12 * Together, using the current command computing unit 13, the torque current command Iq is calculated * (perpendicular to the motor flux), excitation current command Id * (par...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P23/14H02P1/26H02P27/04H02P21/00H02P21/22H02P21/34H02P23/07H02P27/06
CPCH02P21/085H02P21/09
Inventor 永田浩一郎奥山俊昭根本治郎片山敏男
Owner HITACHI IND PROD LTD
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