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Control device for alternating current motor

A technology of AC motor and control device, which is applied in AC motor control, motor control, AC motor angular single-axis angular velocity control and other directions, and can solve the problems of complicated calculation method of current command and so on.

Active Publication Date: 2012-10-24
YASKAWA DENKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this setting method, it is necessary to change the control gain according to the operation status, or the calculation method of the current command becomes complicated

Method used

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  • Control device for alternating current motor
  • Control device for alternating current motor
  • Control device for alternating current motor

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0057] First, refer to figure 1 The structure of the control device for an AC motor according to the first embodiment will be explained. figure 1 is an overall control block diagram of the AC motor control device 100 according to the first embodiment.

[0058] like figure 1 As shown, the AC motor control device 100 according to this embodiment includes: subtractors 1 and 4, speed controller 2, current distributor 3A, current controller 5, voltage drop calculator 6, voltage command unit 7, phase estimation 8, coordinate converter 9, inverse coordinate converter 10, inverter circuit 11 and current detector 12. The control device 100 drives the AC motor 20 as a control object.

[0059] Subtractor 1 calculates a speed command ω supplied from the outside (not shown) * and the speed estimate ω∧ supplied from the phase estimator 8, and output the difference to the speed controller 2 as a speed error.

[0060] The speed controller 2 outputs a torque command T as a control output ...

no. 2 approach

[0123] As described above, the control device 100 for an AC motor according to the first embodiment has been explained. Next, the control device 101 according to the second embodiment will be explained.

[0124] The control device 101 according to the second embodiment differs from the control device 100 according to the first embodiment in that the control device 101 includes a current divider 3B instead of a current divider 3A, and the speed estimate provided from the phase estimator 8 ω∧ is not input to the current distributor 3B. The other components of the device device 101 are the same as those of the control device 100 . Therefore, for the convenience of explanation, repeated explanations are appropriately omitted, and the differences from the first embodiment are mainly explained. In addition, a control block diagram of the control device 101 according to the second embodiment is not shown.

[0125] The current distributor 3A of the first embodiment performs high-ef...

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Abstract

The invention discloses a control device for an alternating current motor. The control device for the alternating current motor according to embodiments includes a current distributor and a phase estimator. The current distributor divides a torque command by using a control phase and outputs a component that contributes to a mechanical output of the motor as a [delta]-axis current command and a component that does not contribute to the mechanical output as a [gamma]-axis current command. The phase estimator computes a phase at which a [gamma]-axis component of an addition amount of the output of the current controller and a voltage drop amount of inductance of the motor becomes zero and outputs the computed phase as the control phase.

Description

technical field [0001] The embodiments discussed here relate to a control device for an AC motor. Background technique [0002] A power conversion control device is known as an example of a device that drives an AC motor without a position sensor, such as a synchronous machine, a reluctance machine, an induction machine, or an induction synchronous machine. The AC motor is known, for example, the AC motor disclosed in Japanese Laid-Open Patent Publication No. 2007-300780. The power conversion controller includes a power converter, a current detector, a frequency calculation unit that determines the operating frequency of the power converter, an integral calculation unit that calculates and outputs a phase angle signal through an integral operation based on the output of the frequency calculation unit, and an orthogonal two-axis A conversion unit, a two-axis current control unit, a PWM signal generating unit, and a PWM controller for controlling the power converter according...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P27/04H02P21/13H02P21/14H02P21/18H02P21/22H02P21/24H02P21/28H02P23/14H02P23/16H02P23/26
CPCH02P21/146H02P21/0042H02P2203/11H02P21/26H02P21/18
Inventor 山崎明井手耕三
Owner YASKAWA DENKI KK