Device for controlling electric motor and method for controlling electric motor

一种控制装置、电动机的技术，应用在电动机控制、电动发电机控制、交流电动机控制等方向，能够解决转矩级差、司机不协调等问题

Active Publication Date: 2015-02-04
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, if the constant torque differs depending on the control mode, a so-called torque step occurs when the control mode is switched, giving the driver a sense of discomfort

Method used

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  • Device for controlling electric motor and method for controlling electric motor
  • Device for controlling electric motor and method for controlling electric motor
  • Device for controlling electric motor and method for controlling electric motor

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0015] figure 1 is a control block diagram of motor control in the first embodiment. This control is executed according to a flowchart described later.

[0016] This control is executed by switching between the current control mode and the voltage phase control mode according to the operating state of the motor. The current control mode is a control mode based on a current command value based on a motor constant corresponding to the magnet temperature of the motor 9 and a torque command value. The voltage phase control mode is a control mode in which torque feedback operation is performed on the voltage phase based on the deviation between the torque estimated value and the torque command value based on the torque calculation formula. In addition, the mode is switched to the voltage phase control mode in a high-rotation region where flux-weakening control is performed.

[0017] figure 1 The current control unit 100 includes a current command generation unit 1, a disturba...

no. 2 approach

[0053] figure 2 It is a control block diagram of motor control in the second embodiment. This control is executed according to a flowchart described later.

[0054] In this embodiment, the magnet temperature tmp is set to a fixed value (25° C.), and the inductance generating unit 13 is provided instead of the motor constant generating unit 18 . In addition, in this way, the calculation contents of the current control unit 100 and the voltage phase control unit 200 are different from those of the first embodiment. Hereinafter, differences from the first embodiment will be described. In addition, 25° C. is a temperature set based on the performance guarantee temperature or the operating environment temperature when the magnet temperature tmp is a fixed value, but is not limited thereto.

[0055] The current control unit 100 will be described.

[0056] The torque command value T is input to the current command generator 1 * , rotation speed N, and battery voltage V dc , re...

no. 3 approach

[0066] image 3 is a control block diagram of motor control in the third embodiment. This control is executed according to a flowchart described later.

[0067] Hereinafter, differences from the second embodiment will be described.

[0068] The torque command value T is input to the current command generator 1 and the disturbance voltage generator 2 * , rotation speed N, and battery voltage V dc , refer to the table generated by previous experiments or calculations, generate and output the dq-axis current command value i in the case of tmp=25°C d *, i q *And dq axis interference voltage value v d * _dcpl , v q * _dcpl . However, as a premise for creating the table, the modulation factor M in the saturation region of the motor applied voltage, that is, the flux weakening region * and in the dq-axis voltage generator 16 according to the voltage phase command value α * Calculate the dq-axis voltage command value v for the voltage phase control mode dv * , v qv * ...

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PUM

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Abstract

An electric motor control device includes: a motor constant generator configured to generate a motor constant by using a temperature as a parameter; a current control unit configured to generate a current command value to an electric motor based on the motor constant and a torque command value and execute a current control mode in which a voltage applied to the electric motor is controlled to match the current command value; a voltage phase control unit configured to calculate a torque estimation value of the electric motor and execute a voltage phase control mode in which a feedback operation is performed for a voltage phase based on the difference between the torque estimation value and the torque command value; and a control mode switching unit configured to switch to the voltage phase control mode in a high rotation area where a flux weakening control is performed. The torque estimation value is calculated using the motor constant common to generation of the current command value in the current control mode.

Description

technical field [0001] The present invention relates to control of a system that converts a DC voltage supplied from a battery into an AC voltage by an inverter and applies it to an AC motor. Background technique [0002] As a torque control method of an AC motor, a method of controlling current and a method of controlling voltage are known. As current control, for example, PWM control that controls current by PWM (Pulse Width Modulation) control by vector control is known. As the voltage control, there is known a rectangular wave control in which an AC motor is rotationally driven by applying a rectangular wave voltage. Furthermore, as a control for realizing an output improvement in a so-called flux weakening region, it is known to control the rotational speed of an AC motor by manipulating a voltage phase according to a deviation between a torque command value and an actual torque in rectangular wave voltage control. Torque voltage phase control. Furthermore, there is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P27/04H02P21/05H02P21/14H02P21/16H02P21/18H02P21/22H02P21/24H02P23/04H02P23/14H02P23/28H02P27/08
CPCH02P21/145H02P21/148H02P21/0089H02P21/16H02P21/20H02P29/662
Inventor 正治满博
Owner NISSAN MOTOR CO LTD
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