Brushless DC motor

A brushless, motor-driven control technology, applied in the direction of motor generator control, electronic commutation motor control, control generator, etc., can solve the problems of increased noise, increased motor noise, vibration, etc.

Inactive Publication Date: 2008-01-09
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
[0026] 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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Embodiment Construction

[0039] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0040] 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.

[0041] 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 for a brushless DC motor, which has small torque ripple even if a trapezoidal wave current is supplied and has a small size and reduced motor noise. Respective phase current command values are calculated on the basis of vector control. Pseudo-vector control for controlling respective phases separately is used as current feedback control.

Description

[0001] This application is a divisional application of an invention patent application with an international filing date of November 27, 2003, an international application number of PCT / JP2003 / 015166, a national application number of 200380104519.4, and an invention title of "motor and its drive control device". technical field [0002] 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 [0003] 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 i...

Claims

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Application Information

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