Motor control device and electric power steering device equipped with same

A control device and motor technology, which is applied in the direction of motor control, motor generator control, AC motor control, etc., can solve problems such as uncontrollable system stability, achieve improved operating sound performance and torque fluctuation performance, simple current control structure, and improved Effect of Estimation Accuracy

Inactive Publication Date: 2014-12-10
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the device disclosed in Patent Document 2 has the following problems: Since the disturbance estimated by the disturbance monitor includes current detection disturbance that does not become the actual motor current, and the estimated current follows a value including the current detection disturbance, the current detection disturbance There is no way to make the control system as a whole robust

Method used

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  • Motor control device and electric power steering device equipped with same
  • Motor control device and electric power steering device equipped with same
  • Motor control device and electric power steering device equipped with same

Examples

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Embodiment Construction

[0050] First, an adaptive current monitor that is a premise of the present invention will be described.

[0051] in correspondence figure 2 represented by Figure 7 In the example of , the adaptive current monitor includes an adaptive identification unit 130 , a current estimation unit 140 , a voltage command value determination unit 150 , and a PWM control unit 160 .

[0052] The adaptive identification unit 130 inputs the current detection value i(t) detected by the current detector 120, the current estimated value i_hat(t) estimated by the current estimation unit 140, the voltage command value Um(t) and the dead time compensation value Dt (t), based on the adaptive identification method, the parameter changes of the motor output model are identified. Thereby, the influence of the change of the electrical characteristic parameter of a motor by a temperature change, a manufacturing variation, deterioration over time, etc. is eliminated, and the current estimation accuracy ...

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Abstract

A motor control apparatus that is capable of making the whole control system robust not only with respect to motor parameter variations such as the temperature variation and the manufacturing unevenness but also with respect to disturbances while using a cheap and compact one-shunt type current detecting circuit and simultaneously diagnosing an estimation error and an electric power steering apparatus provide with the motor control apparatus.

Description

technical field [0001] The present invention relates to a motor control device and an electric power steering device equipped with the motor control device. The motor control device includes an adaptive current monitor for estimating the current of a motor, and simultaneously diagnoses (monitors) misestimation of the adaptive current monitor, When an abnormality is detected, the duty ratio (Duty) is limited to forcibly set to a state where the current can be detected, and it switches to current control using the detected current. Background technique [0002] The electric power steering device that uses the rotational force of the motor to assist in controlling the steering system of the vehicle applies the driving force of the motor to the steering shaft or rack shaft through a transmission mechanism such as a gear or a belt through a reducer. Furthermore, an inverter is used in a motor drive circuit in order to supply electric current to a motor so that the motor can gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/06B62D5/04H02P29/00B62D6/00B62D101/00B62D119/00H02P21/00H02P21/13H02P21/14H02P21/22H02P23/12H02P23/14H02P27/08
CPCB62D5/046H02P27/06B62D7/159B62D5/0463H02P6/08H02P29/00H02P21/0035B62D6/003H02M7/5395H02M2001/0009B62D5/049B62D6/008B62D5/0484B60T8/1755H02P29/0241H02M1/0009H02P6/10
Inventor 星让坂口徹中山幸雄前田将宏森坚吏今村洋介
Owner NSK LTD
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