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Motor and drive control device therefor

A technology of motor drive control and current control, applied in motor generator control, AC motor control, control of electromechanical transmission devices, etc., can solve problems such as torque fluctuation, nonlinear factor diffusion, and vibration.

Inactive Publication Date: 2008-02-13
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, in the case of the above-mentioned conventional control method, although the motor is driven by 3 phases, the current control of computing feedback is performed by 2 phases, and the command values ​​Vd and Vq determined by the 2 phases are formally converted into the 3-phase command value Va , Vb, Vc to control, therefore, nonlinear factor diffusion
[0025] Therefore, there is a problem that the torque fluctuation caused by the above-mentioned conventional motor control increases, and the noise of the motor also increases.
In addition, when such motor control is applied to an electric power steering system, accurate and stable power assist cannot be performed following the steering operation, and vibrations are felt during steering, or the noise becomes louder.

Method used

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  • Motor and drive control device therefor
  • Motor and drive control device therefor
  • Motor and drive control device therefor

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Embodiment Construction

[0044] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0045] In this example, a three-phase brushless DC motor is described, but the present invention is not limited thereto, and the present invention can be similarly applied to other motors.

[0046] As shown in Figure 4, the 3-phase brushless DC motor 1 of the present invention has: cylindrical shell 2; rotatably supported; a permanent magnet 5 for motor driving, which is fixed to the rotating shaft 4; a stator 6, which is fixed to the inner peripheral surface of the housing 2 to surround the permanent magnet 5, and is wound with three-phase excitation coils 6a, 6b , 6c. The rotor 7 is constituted by the rotating shaft 4 and the permanent magnets 5 . In the vicinity of one end of the rotating shaft 4 of the rotor 7, an annular permanent magnet 8 for phase detection is fixed, and the permanent magnet 8 is alternately polarized into S poles and N poles at equal intervals...

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Abstract

The invention provides a motor used for a brushless DC motor, which can not only provide trapezoidal wave electric current, but also achieve small torque fluctuation, minitype and low noise, a drive control device thereof and an electric power steering device using the motor and the drive control device. Current order of each phase is figured out based on vector control; current feedback is controlled by using quasi-vectors of all phases which are individually controlled.

Description

technical field [0001] The present invention relates to an improvement of a motor most suitable for use in an electric power steering device, its control device, and an electric power steering device using them. Background technique [0002] The electric motor used in the electric power steering device in the past is generally a permanent magnet synchronous motor (PMSM), and the permanent magnet synchronous motor is driven by a three-phase sine wave current. In addition, as a control method for driving a motor, a control method called vector control is widely used. However, there is a strong demand for miniaturization of electric power steering devices, and there is a tendency to use a brushless DC motor as a motor suitable for miniaturization. [0003] Under such circumstances, a conventional motor drive control device using a vector control method using a motor for an electric power steering apparatus will be described with reference to FIG. 1 . [0004] Its structure is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00H02P21/06H02P25/03H02P27/08
Inventor 佐高明远藤修司
Owner NSK LTD