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Motor control device

A technology for control devices and electric motors, which is applied in the fields of motor generator control, AC motor control, motor vibration suppression control, etc., and can solve problems such as deterioration of steering feeling, high-frequency noise, and high-frequency noise in the decoupling control amount

Inactive Publication Date: 2011-02-23
JTEKT CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the rotational angular velocity is calculated from the output signal of the rotational position detection unit, and the motor current value is obtained from the detection result of the current detection unit, so high-frequency noise is contained in them
As a result, the decoupling control quantity also contains high-frequency noise
This high-frequency noise causes vibration and noise, for example, there is a problem of causing discomfort to the user of the electric power steering system and deteriorating the steering feeling.

Method used

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Examples

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Embodiment Construction

[0047] figure 1 It is a block diagram illustrating an electrical configuration of an electric power steering apparatus to which a motor control apparatus according to an embodiment of the present invention is applied. This electric power steering system includes a torque sensor 7 that detects a steering torque applied to a steering wheel of a vehicle, a vehicle speed sensor 8 that detects a vehicle speed, an electric motor 1 that applies steering assist to a steering mechanism 3 of a vehicle, and an electric motor that drives and controls the electric motor 1. Control device 10. The motor control device 10 drives the motor 1 based on the steering torque detected by the torque sensor 7 and the vehicle speed detected by the vehicle speed sensor 8 , thereby realizing appropriate steering assistance according to the steering situation. The motor 1 is, for example, a three-phase brushless DC motor.

[0048] The motor control device 10 has a microcomputer 12 and a drive circuit 13...

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Abstract

This motor control device includes target current level setting units (15, 16) that set target current levels to be supplied to a motor (1), basic voltage level calculation units (511, 521, 51a, 52a) that calculate the basic voltage level at which to drive the motor, a rotational angle velocity calculation unit (23) that calculates the rotary angular velocity of the motor, correction value calculation units (50, 512, 515, 516, 522, 525, 526) that calculate correction values to correct the aforementioned basic voltage level, correction units (513, 523) that correct the basic voltage level by the correction values calculated by the aforementioned correction value calculation units to find a voltage directive value, and a drive unit (13) that uses the voltage directive value to drive the aforementioned motor. The correction value calculation units include correction value smoothing units (50, 515, 516, 525, 526) for finding smoothed correction values.

Description

technical field [0001] The present invention relates to a motor control device for driving an electric motor, especially a brushless motor. A brushless motor is used, for example, as a source of power steering in an electric power steering system. Background technique [0002] A motor control device for a brushless motor includes a current detection unit, a rotational position detection unit, a dq-axis target current value calculation unit, a dq-axis current calculation unit, a d-axis voltage command value calculation unit, and a q-axis voltage command value calculation unit. The current detection unit detects the current flowing through the armature winding of the motor. The rotational position detection unit detects the rotational position of the rotor of the motor. The dq-axis target current value calculation unit calculates the d-axis target current value and the q-axis target current value. The dq-axis current calculation unit calculates the d-axis current and the q-...

Claims

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Application Information

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IPC IPC(8): B62D5/04H02P27/04H02P21/00H02P6/16H02P6/06H02P6/08H02P6/18H02P6/28H02P21/05H02P21/18H02P21/22H02P21/24H02P23/04H02P27/08
CPCH02P21/146H02P21/145B62D5/0463H02P21/16H02P21/18
Inventor 长濑茂树上田武史狩集裕二须增宽
Owner JTEKT CORP