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Motor drive device, controller, and electric vehicle system

A motor drive and controller technology, applied in control systems, vector control systems, control generators, etc., can solve problems such as poor control response and increased overshoot, and achieve the effect of suppressing current ripple and stabilizing current control

Active Publication Date: 2020-11-20
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But on the other hand, when the control gain is increased, the influence of the controller's operation lag and parameter setting errors on the current control results will increase, so it will lead to an increase in the amount of overshoot in the transient response, etc., and the control responsiveness On the contrary, it may be worse

Method used

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  • Motor drive device, controller, and electric vehicle system
  • Motor drive device, controller, and electric vehicle system
  • Motor drive device, controller, and electric vehicle system

Examples

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Effect test

no. 1 approach

[0031] figure 1 The configuration of the motor drive device according to the first embodiment of the present invention is shown. like figure 1 As shown, the motor drive device 100 of the present embodiment includes a controller 102 and a power conversion circuit 103 for driving the AC motor 101 . A position sensor 104 is attached to the AC motor 101 , and a current sensor 105 is attached to the power conversion circuit 103 . The AC motor 101 is a motor that is rotationally driven by AC power output from the motor drive device 100 , and is, for example, a three-phase synchronous motor. In addition, the power conversion circuit 103 is a circuit that converts DC power into AC power under the control of the controller 102 and outputs it to the AC motor 101 , and is, for example, a three-phase full-bridge converter configured using a plurality of semiconductor elements.

[0032] The controller 102 controls the current of the AC power output from the power conversion circuit 103 ...

Embodiment approach

[0096] In the first embodiment described above, an example in which the delay time element at the time of changing the control gain in the motor drive device according to the present invention is realized by the low-pass filter of the control gain changing unit 113 has been described. On the other hand, as a second embodiment of the present invention, an example of the lag time element when the change of the control gain is realized by an integrator will be described below.

[0097] Figure 8 The configuration of the motor drive device according to the second embodiment of the present invention is shown. like Figure 8 As shown, in the motor drive device 100 of this embodiment, a control gain changing unit 800 is provided in the controller 102 instead of the control gain change unit 800 described in the first embodiment. figure 1 The control gain changing unit 113. Other constituent elements are the same as those of the first embodiment.

[0098] Figure 9 The internal st...

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PUM

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Abstract

The motor drive device performs stable current control even when an external disturbance occurs, while suppressing steadily occurring current ripples. The motor drive device (100) is provided with a power conversion circuit (103) for driving an AC motor (101) and a controller (102) for controlling the power conversion circuit (103). The controller (102) has a voltage command calculation unit (108), a control state determination unit (112), and a control gain change unit (113). The control gain change unit (113) immediately changes a control gain to a normal set value when a determination signal output from the control state determination unit (112) is switched from a determination signal representing a steady state to a determination signal representing a transient state, and changes the control gain to a high-gain set value with a predetermined delay time when the determination signal output from the control state determination unit (112) is switched from the determination signal representing the transient state to the determination signal representing the steady state.

Description

technical field [0001] The invention relates to a motor drive, a controller, and an electric vehicle system. Background technique [0002] In motor driving, current pulsation due to PWM control of the inverter or the like is constantly generated. When current pulsation occurs, vibration and noise will be generated, which will cause disadvantages such as deterioration of comfort in equipment equipped with motors. Therefore, the industry is seeking effective countermeasures against current pulsation. [0003] As a countermeasure against current ripple, for example, a method of improving control responsiveness by using a high gain setting in which a control gain in current control is increased compared to usual is known. Accordingly, current ripples that are constantly generated can be suppressed. But on the other hand, when the control gain is increased, the influence of the controller's operation lag and parameter setting errors on the current control results will increase,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/05H02M7/48H02P21/22H02P23/04
CPCH02P21/22H02P21/05H02P23/04H02M7/5395H02M1/0025H02P21/14H02P27/06
Inventor 中尾矩也户张和明高桥史一西口慎吾
Owner HITACHI ASTEMO LTD