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AC motor control device

An AC motor and control device technology, applied in AC motor control, motor generator control, electronic commutation motor control, etc., can solve the problems of reduced torque responsiveness, reduced voltage utilization, low maximum output voltage, etc. Effects of suppressing the decrease in torque responsiveness and suppressing the decrease in voltage utilization

Inactive Publication Date: 2016-04-06
YASKAWA DENKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The setting threshold is set lower than the limit value of the output voltage, thereby suppressing the decrease in torque responsiveness caused by the saturation of the output voltage (hereinafter referred to as voltage saturation), but making the maximum output voltage lower than the limit value, so Reduced voltage utilization
On the other hand, when it is necessary to suppress the decrease of the voltage utilization factor, the torque responsiveness decreases due to the voltage saturation
Therefore, in the conventional voltage limit control, there is a trade-off relationship between the decrease in torque responsiveness due to voltage saturation and the decrease in voltage utilization rate.

Method used

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no. 1 Embodiment approach ）

[0022] First, the motor control device of the first embodiment will be described. figure 1 It is a figure which shows the structure of the motor control apparatus of embodiment.

[0023] Such as figure 1 As shown, the motor control device 1 of the first embodiment includes a power conversion unit 10 , a current detection unit 11 , and a vector control unit 12 . The motor control device 1 described above converts the DC power supplied from the DC power supply 2 into three-phase AC power of a desired frequency and voltage through known PWM (Pulse Width Modulation) control, and outputs the three-phase AC power to the three-phase AC motor 3 (hereinafter referred to as Motor 3). The motor 3 is, for example, a permanent magnet synchronous motor.

[0024] The power conversion unit 10 has a three-phase inverter circuit 13 and a PWM signal generator 14 . Three-phase inverter circuit 13 is connected between DC power supply 2 and motor 3 . The above-mentioned three-phase inverter ci...

no. 2 Embodiment approach ）

[0134] Next, a motor control device according to a second embodiment will be described. The motor control device of the present embodiment is different from the motor control device 1 of the first embodiment in that a current limiter is included in the vector control unit. In addition, the same code|symbol is attached|subjected to the structural element which has the same function as the motor control apparatus 1 of 1st Embodiment, and redundant description is abbreviate|omitted.

[0135] Figure 9 It is a figure which shows the structure of the motor control apparatus of 2nd Embodiment. Such as Figure 9 As shown, the motor control device 1A of the second embodiment includes a current limiter 23 and a subtractor 25 in a vector control unit 12A.

[0136] As described above, when performing constant output control, compared to the d-axis current i d_fb control, the q-axis current i q_fb The control effect of is stronger, so it is impossible to control the d-axis current i ...

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Abstract

AC motor controls. It is possible to simultaneously suppress a decrease in torque responsiveness and a decrease in voltage utilization in the constant output region. A control device for an AC motor according to an embodiment includes a d-axis disturbance suppression controller, a constant output controller, and a d-axis voltage command corrector. The constant output controller outputs a corrected voltage command for the d-axis voltage command based on the integral value of the deviation between the q-axis current command and the q-axis current flowing through the AC motor, that is, the q-axis current deviation. The d-axis voltage command corrector subtracts the correction voltage command from the d-axis voltage command after the d-axis disturbance removal controller performs the disturbance removal control, thereby correcting the d-axis voltage command.

Description

technical field [0001] The disclosed embodiments relate to a control device for an AC motor. Background technique [0002] In a control device for an AC motor, drive control in a constant output region is generally performed by setting a current command of the d-axis, which is an axis parallel to the magnetic flux of the AC motor, in a negative direction to weaken the magnetic flux. The control described above is also called voltage limit control (for example, refer to Patent Document 1). [0003] [Patent Document 1] Japanese Unexamined Patent Publication No. 2010-022165 [0004] In conventional voltage limit control, when the output voltage exceeds a set threshold value, the d-axis current command is corrected to a negative direction, and the output voltage command is controlled by current control. The setting threshold is set lower than the limit value of the output voltage, thereby suppressing the decrease in torque responsiveness caused by the saturation of the output ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/22H02P27/06H02P21/00H02P27/04H02P27/08
CPCH02P21/0003H02P21/0085H02P21/0089H02P21/24
Inventor 山崎明井浦英昭
Owner YASKAWA DENKI KK