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Electric motor device

A technology of electric motors and spindle motors, which is applied in the direction of electromechanical devices, electrical components, and information recording on disks, etc. It can solve the problems of magnetic flux density gap loss, high processing cost, and high cost, and achieve the effect of reducing the area of ​​the circuit board

Inactive Publication Date: 2004-12-08
ALPS ALPINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, in the above-mentioned conventional spindle motor index detection device, since it is necessary to detect the magnetic fluxes of the two-pole magnets 108a, 108b very sensitively, it is necessary to use the high-cost Hall element 107 formed on the flange 103a of the rotor yoke 103. Hole 103b, must make the front end of two-pole magnet 108a, 108b protrude very long outside hole 103b
In the case where the two-pole magnet is integrated with the rotor magnet 108, there is a problem that the processing cost is high
In addition, when the separate two-pole magnets 108a and 108b are attached to the rotor magnet 108, a gap loss of the magnetic flux density is caused, so there is a problem that the detection sensitivity of the Hall element 107 inevitably decreases.

Method used

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Embodiment Construction

[0040] figure 1 , figure 2 These are a plan view of an index detection device for a spindle motor and a motor device equipped with the detection device and a plan view of a stator section, respectively, showing an embodiment of the present invention.

[0041] The spindle motor has a circuit board 2 and a rotor yoke 3 stacked on a chassis 1 . The chassis 1, which is a metal chassis, is composed of a metal plate. Mounting plates 1a bent into an L shape are integrally provided at three positions around the metal plate. These mounting plates 1a are provided with mounting holes 1b for fixing the base frame 1 to the floppy drive case or the like with tools such as screws. In addition, substantially L-shaped upwardly protruding positioning pawls 1c are provided at two other positions on the outer periphery of the chassis 1 . These positioning pawls 1c play a role in pressing and holding a portion of the periphery of the circuit board 2 stacked on the chassis 1 from above and pa...

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Abstract

A device is provided with a rotor magnet arranged on the inner periphery in the flange part of the rotor yoke constituting a spindle motor and the window part formed in the flange part in such a manner that part of the rotor magnet faces outside. The magnetic fluxes of the rotor magnet are detected via the window part by an inductor arranged on a stator side so as to face the outer periphery of the flange part.

Description

technical field [0001] The present invention relates to a motor unit equipped with an index detection device of a spindle motor for driving a rotating recording medium such as a floppy disk to rotate. [0002] For example, in a spindle motor that drives a rotating recording medium such as a floppy disk, an indication signal of 1 pulse is required for each rotation of the floppy disk in order to determine the starting point of data writing and the like. In addition, this indication signal is used for the purpose of detecting the rotation of the floppy disk and the motor in the floppy drive and generating a preparation signal for writing and reading, or starting writing at the time of information transfer / formatting on the system side and Stop writing when the rotation is over. Background technique [0003] Figure 10~ Figure 12 The structure of the spindle motor index detecting device for detecting the index of the spindle motor by such an indication signal is schematically ...

Claims

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Application Information

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IPC IPC(8): G11B19/20G11B19/28H02K29/12
CPCG11B19/28
Inventor 关根干夫
Owner ALPS ALPINE CO LTD