Brushless dc electric machine and special stater iron core thereof

Abstract

The invention relates to the principal axis motor used to rotate the data noting disc. The iron core frame related by the invention: the center of the stator iron core has the open hole, the several poles are distributed evenly on the circle of the iron core of the stator, the distance R between the point of the outer contour of every pole and the center of the iron core reduces gradually at the same direction, the percentage between the most distance R0 between the point of the pole outer contour of the iron core of the stator and the least distance R1 is 1.01-1.1, the said poles are 4-10, the outer contour of the pole of the iron core of the stator is arc or the beeline or the other curve figure. The startup moment is great, the driving time of the motor and the time consumed by the motor rotor to reach the high speed balance rotate are shorter.

Description

technical field [0001] The present invention relates to a brushless DC motor, and more particularly to a spindle motor for rotating a data recording disc (hereinafter referred to as "optical disc") such as CD, DVD, CD-ROM, DVD-ROM. technical background [0002] In an optical disc player, the rotary motor needs to rotate the optical disc at a high speed without vibration and eccentric movement of the optical disc and the turntable. In order for the rotating motor to rotate without vibration and eccentric motion, it is important to stably load the turntable in the disc during the high-speed rotation of the disc to keep the balance of the disc and to obtain the durability of the rotating motor. [0003] Therefore, someone has proposed a rotating motor called a CD player (application number: 03122307.9), which includes: a motor with a rotating shaft, a turntable that rotates with the rotating shaft and has an annular track groove, and is grooved along the track on the track groo...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a brushless DC motor with a large starting torque, a shorter starting time of the motor and a shorter time for the motor rotor to achieve high-speed equilibrium and uniform rotation, and a special stator core thereof, which solves the problems caused by the motor rotor part of the existing motor. The addition of moving components will increase the torque of the motor when it starts, and at the same time, the start-up time and the time for the motor rotor to reach high-speed equilibrium and uniform rotation will also be prolonged, etc.

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