Vector controller of induction motor

A technology of induction motor and vector control, which is applied in motor generator control, AC motor control, electronic commutation motor control, etc. It can solve problems such as difficult adjustment, and achieve the effect of avoiding and reducing unstable areas

Inactive Publication Date: 2007-07-04
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In conventional vector control devices for induction motors, if the induction motor is changed, it is necessary to change the setting value of the magnetic flux generating circuit and the graph data of the software constituting the control system for each induction motor, so there is a problem of avoiding an unstable region. Difficult to adjust

Method used

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  • Vector controller of induction motor
  • Vector controller of induction motor
  • Vector controller of induction motor

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0024] Hereinafter, each embodiment of the present invention will be described with reference to the drawings, but the same or corresponding parts will be described with the same reference numerals in each of the drawings.

[0025] Fig. 1 is a block diagram showing a device configuration including a vector control device for an induction motor according to Embodiment 1 of the present invention.

[0026] In addition, in FIG. 1, although the direct current electric train was demonstrated as an example, the case of an alternating current electric train can be applied similarly.

[0027] In Figure 1, the main circuit of the tram includes: overhead wire 1 that provides DC power to the tram, pantograph 2 that collects DC power from overhead wire 1, and converts the DC power collected from overhead wire 1 into AC power of any frequency VVVF inverter 3, DC reactor 4 and filter capacitor 5 connected to the DC terminal of VVVF inverter 3, and wheel 6 connected to the negative end of fil...

Embodiment 2

[0105] In addition, in the above-mentioned first embodiment, in the magnetic flux command value calculation means, only the rotor rotational angular frequency is considered to switch the magnetic flux command, but the braking command may also be considered.

[0106] In the second embodiment, the means for switching the magnetic flux command value according to the braking command is added to the first embodiment.

[0107] Fig. 6 is a block diagram showing a device configuration including a vector control device for an induction motor according to Embodiment 2 of the present invention.

[0108] In FIG. 6 , in the vector control device, a brake command B is input to a magnetic flux command value calculation unit 11 . The rest of the structure is the same as that of Embodiment 1, so the description thereof will be omitted.

[0109] FIG. 7 shows a block diagram of the magnetic flux command value calculation unit 11 of the induction motor vector control device shown in FIG. 6 .

...

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Abstract

Provided is a vector control apparatus for an induction motor which is capable of obtaining stable rotation in a short period of time for adjustment even at the time of low-speed operation by increasing the SN ratio of an output voltage to suppress the arithmetic error in the primary angular frequency arithmetic value based on a magnetic flux command value calculated from a circuit constant and an actual measurement of the induction motor even in the case where the rotation velocity of the induction motor is lower. The vector control apparatus includes: magnetic flux command value arithmetic means (11) for selecting and outputting the magnetic flux command value on the basis of a torque command value Tmr that is input from the external, the circuit constant of the induction motor, and the actual measurement related to the induction motor; and vector control means (10) for controlling the inverter device (3) on the basis of the magnetic flux command value that is output from the magnetic flux command value arithmetic means (11) and the circuit constant of the induction motor (8). The magnetic flux command value arithmetic means (11) includes a magnetic flux command value back calculation arithmetic section (21) for calculating a magnetic flux command arithmetic value F2RB so that a voltage that is applied to the induction motor 8 becomes equal to or higher than a setting value corresponding to an unstable area.

Description

technical field [0001] The present invention relates to a sensorless vector control device for an induction motor capable of greatly reducing an unstable region during low-speed operation without particularly using a rotational speed detection unit such as a speed sensor. Background technique [0002] Vector control is to decompose the current of the AC motor into the direction of the magnetic field (magnetic flux) and the direction of the torque perpendicular to the magnetic field, so that the current of the magnetic flux component and the current of the torque component can be controlled independently of each other, and can be controlled instantaneously like a DC motor. Torque occurs. [0003] In vector control, a speed sensor is required to measure magnetic flux. However, an electronic circuit is usually installed in the speed sensor, and the operating temperature range of the electronic circuit is smaller than that of the AC motor in which the speed sensor is installed....

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H02P21/00H02P21/04H02P21/14H02P21/18H02P21/22H02P21/24H02P23/03H02P23/07H02P23/12H02P23/14H02P27/04
CPCH02P21/12H02P21/0042H02P21/0092H02P21/00
Inventor河野雅树
OwnerMITSUBISHI ELECTRIC CORP