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Control device for electric motor

A technology for a control device and a motor, which is used in motor control, motor generator control, AC motor control, etc., and can solve problems such as increasing development workload.

Active Publication Date: 2016-08-03
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The determination of such a threshold has the problem of increasing the development workload

Method used

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  • Control device for electric motor
  • Control device for electric motor
  • Control device for electric motor

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0040] figure 2 It is a block diagram showing the configuration of the motor control device 1 according to the present embodiment and its peripheral devices based on the above idea.

[0041] The motor 3 is a three-phase motor, and has an armature and an excited rotor (not shown). As technical common sense, the armature has armature windings, and the rotor rotates relative to the armature. A case of exciting a magnet having, for example, generating field magnetic flux will be described.

[0042] The voltage supply source 2 has, for example, a voltage-controlled inverter and its control unit, and is based on a three-phase voltage command [v x * ]=[v u * v v * v w * ] t (The superscript "t" behind the parentheses represents the inversion of the matrix. The following is the same), and the three-phase voltage v is applied to the motor 3 u , v v , v w . Thus, a three-phase current [i x ]=[i u i v i w ] t . Among them, the voltage command [v * ] and / or three-pha...

no. 2 Embodiment approach

[0096] In the second embodiment, the technique of obtaining the feedback amount [B] from the current variation is shown. Specifically, the feedback amount [B] is obtained according to the formula (9). Among them, the feedback gain G is introduced i (≠0) and current [i δγc ] instruction value [i δγ * ]=[i δ * i γ * ] t . As in the first embodiment, the feedback gain G i Can be a non-zero matrix of 2 rows and 2 columns that acts on the deviation of the current.

[0097] [Formula 9]

[0098] [ B ] = G i ( i δ * i γ * - ...

no. 3 Embodiment approach

[0105] In this embodiment, a case where only feedback control is performed without using feedforward control is shown. In this case, the voltage command [v δγ * ] is equal to the feedback amount [B].

[0106] [Formula 10]

[0107] V δ * V γ * = [ B ] = G λ ( λ δ * λ γ * ...

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Abstract

A control device for electric motors that sets the range for feedback amounts used during control of electric motors, and applies said range as a determination threshold value for determining the presence of errors (such as missteps) in electric motors. A feedback amount calculation unit (1022) calculates a feedback amount [B] by using the deviation between a current [i delta gamma c] and a command value therefor [i delta gamma*] and the deviation between air-gap magnetic flux [lambda delta gamma c] and a command value [lambda *] therefor. A voltage error calculation unit (1025) calculates the fluctuation range for voltage errors [Delta v delta gamma *] between voltage values and voltage commands [v delta gamma *], on the basis of a voltage equation model for the electric motor. A determination as to the existence of electric motor missteps is made by comparing the fluctuation range for voltage errors [Delta v delta gamma *] and the feedback amount [B].

Description

technical field [0001] The present invention relates to a technique for controlling an electric motor, and particularly relates to a technique for determining that an abnormality has occurred in a synchronous motor. Background technique [0002] Conventionally, various techniques for detecting an imbalance of a motor have been proposed. Patent Documents 1 to 3 are cited as documents illustrating this technology. [0003] Patent Document 1 discloses a technique for discriminating an imbalance from a d-axis current deviation and a q-axis command voltage. [0004] Patent Document 2 discloses a technique for detecting an imbalance by comparing a model voltage with a voltage command. [0005] Patent Document 3 discloses a technique for determining an out-of-tuning condition when the magnetic flux obtained from the current and rotation speed commands is equal to or less than a threshold value. [0006] prior art literature [0007] patent documents [0008] Patent Document 1:...

Claims

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Application Information

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IPC IPC(8): H02P21/00H02P27/04
CPCH02P21/00H02P21/18H02P25/024H02P29/032H02P6/12H02P8/38
Inventor 日比野宽北野伸起
Owner DAIKIN IND LTD
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