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Brushless motor and control method of brushless motor

一种无刷电机、控制方法的技术，应用在电动转向机构、带有静止电枢和旋转磁体的同步电动机、机电装置等方向，能够解决难以抑制峰值等问题，达到电机输出功率提高、输出功率提高、提高电机输出功率的效果

Inactive Publication Date: 2012-05-23
MITSUBA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, when harmonics are superimposed on the induced voltage and the induced voltage of each phase is made into a trapezoidal waveform as described above, it is difficult to suppress the peak current in order to make the phase current of each phase sinusoidal.
Therefore, there is such a problem that in order to limit the current value flowing into the brushless motor, the output power of the motor is correspondingly suppressed.

Method used

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  • Brushless motor and control method of brushless motor
  • Brushless motor and control method of brushless motor
  • Brushless motor and control method of brushless motor

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Embodiment Construction

[0018]Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. figure 1 It is a cross-sectional view showing the structure of an electric power steering device using a brushless motor of the present invention. figure 1 The Electric Power Steering System (EPS) 1 of the present invention is formed into a steering column assist (column assist) type structure that provides motion assist on a steering shaft (steering shaft) 2, and a motor (motor) 3 based on the control method of the present invention is used as a power source use.

[0019] Steering wheels (steering wheels) 4 are mounted on the steering shaft 2 . The steering force of the steering wheel 4 is transmitted to a tie rod 6 via a pinion and a rack shaft (not shown) provided in a steering gear box 5 . Attached to both ends of the tie rod 6 are wheels 7 . The tie rod 6 moves in accordance with the operation of the steered wheels 4, and steers the wheels 7 left and righ...

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Abstract

In a brushless motor having a stator provided with armature windings of a plurality of phases, and a rotor provided with permanent magnets and arranged rotatably on the inside or outside of the stator, the voltage waveform induced between two different phases of the armature windings has a trapezoidal waveform produced by superposing the fifth-order and seventh-order components on a first-order fundamental wave. The content rate X(=(alpha5+alpha7) / alpha1) of the total of the voltage peak values alpha5 and alpha7 of the fifth-order and seventh-order components relative to the voltage peak value alpha1 of the first-order fundamental wave is preferably in the range of 0.01<=X<=0.1, more preferably in the range of 0.02<=X<=0.09.

Description

technical field [0001] The present invention relates to a brushless motor and a control method for the brushless motor, and more particularly to an effective technology for a brushless motor used in an electric power steering device. Background technique [0002] In order to assist the steering force of automobiles and the like, many vehicles in recent years have been equipped with so-called power steering devices. As such a power steering device, in recent years, an electric power steering device (so-called electric power steering device, hereinafter abbreviated as EPS) has been mounted on more and more vehicles from the viewpoint of engine load reduction and weight reduction. As the power source of such EPS, conventional motors with brushes are often used. However, in recent years, due to their excellent maintenance and the ability to obtain high torque with a small computer, brushless motors increased use. [0003] In such an EPS motor, reducing operating noise has beco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K21/16H02K1/16B62D5/04H02K29/00
CPCB62D5/046B62D5/0403
Inventor 大久保雅通
Owner MITSUBA CORP