Unlock instant, AI-driven research and patent intelligence for your innovation.

Controller of AC motor

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

Inactive Publication Date: 2014-05-21
YASKAWA DENKI KK
View PDF7 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Controller of AC motor
  • Controller of AC motor
  • Controller of AC motor

Examples

Experimental program
Comparison scheme
Effect test

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 Recorded 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 circu...

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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a controller of an AC motor, capable of suppressing the lowering of torque responsiveness and voltage utilization rate in a constant output area. The controller comprises a d-axis non-interactive control section, a constant output controller and a d-axis voltage command corrector. The constant output controller outputs voltage correction commond aiming at the d-axis voltage based on the current difference between the d-axis current command and q-axis current flowing by the AC motor, namly the integral value of q-axis current difference. The d-axis voltage command corrector corrects the d-axis voltage commond by subtracting correcting voltage common from the d-aixs voltage commond after eliminating interference by the d-axis non-interactive control section.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P27/06H02P21/22H02P27/04H02P27/08
CPCH02P21/0003H02P21/0085H02P21/0089H02P21/24
Inventor 山崎明井浦英昭
Owner YASKAWA DENKI KK