JPH0416627Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a planar brushless motor that is effective for use in video tape recorders, audio tape recorders, and the like.

BACKGROUND OF THE INVENTION In recent years, flat-faced brushless motors have been widely used as drive sources for audio and video equipment due to their compact shape and good controllability.

Hereinafter, an example of the above-mentioned conventional planar brushless motor will be described with reference to the drawings.

FIG. 3 shows a cross-sectional view of a conventional flat-faced brushless motor. In Figure 3, 1
is a rotor magnet, 2 is a rotor plate, 3 is a boss, 4a is a stator plate, 5 is a stator coil, 6 is a chassis, 7 is a motor shaft, 8 is a radial bearing, 9 is a housing, 10 is a thrust bearing,
11 is a shear boss, and stator plate 4
A and stator coil 5 are used as a unit,
This is the stator yoke 4.

An annular rotor magnet 1 magnetized to a plurality of predetermined poles on a first plane portion 1a and a stator plate 4a made of a magnetic material and facing the first plane portion 1a with a predetermined gap. The rotor magnet 1 is fixed to a rotor plate 2 made of a magnetic material by abutting the second flat part 1b of the rotor magnet 1. The rotor plate 2 is fixed to a boss 3 made of metal or resin material, and the boss 3 is fixed to a motor shaft 7 so that the rotor plate 2 rotates integrally with the motor shaft 7. The motor shaft 7 is rotatably supported by a radial bearing 8 of a housing 9 attached to the chassis 6, and is thrust supported by a thrust bearing 10 of the housing 9. The stator plate 4a
is fixed to the chassis boss 11 on its outer periphery.

Problems to be Solved by the Invention However, in the above configuration, the stator plate 4a is fixed only at the outer periphery, so when the motor rotates, the stator plate 4a is 4a and the stator coil 5 vibrate in a direction perpendicular to the surface of the stator plate 4a, causing noise generation and deterioration of rotation accuracy.

In view of the above-mentioned problems, the present invention provides the stator plate 4a of the stator plate 4a and the stator coil 5.
The present invention provides a flat-faced brushless motor that suppresses vibrations in the direction perpendicular to the plane a, is quiet, and has excellent rotational accuracy.

Means for Solving the Problems In order to solve the above problems, the planar opposed type brushless motor of the present invention has a rotor magnet that is magnetized alternately with N pole and S pole, and a rotor magnet that faces the rotor magnet. a stator yoke having a stator coil arranged in the same manner, a means for fixing an outer peripheral portion of the stator yoke to a boss portion of a chassis, and a cushioning member that receives compressive force from the stator yoke and the chassis at a central portion of the stator yoke. It is equipped with the following.

Function The present invention has the above-mentioned configuration, so that the stator yoke absorbs the compressive force at the position where the stator yoke vibrates most strongly due to the attraction and repulsion forces of the stator coil and rotor magnet when the motor rotates, that is, the central part of the stator yoke. Vibration of the stator yoke can be suppressed by elastically holding the stator yoke.

Embodiment Hereinafter, a planar brushless motor according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a sectional view of a planar brushless motor according to a first embodiment of the present invention. The configuration of this flat-faced brushless motor is
Since it is almost the same as the conventional planar brushless motor shown in FIG. 3 described above, repeated explanation will be omitted here, and corresponding parts will be given the same reference numerals.
The feature of the flat-faced brushless motor of the present invention is that a cushioning material 12 such as rubber, cork, or resin is provided at the center of the stator plate 4a, which receives the compressive force between the stator plate 4a and the chassis 6. be. As a result, stator plate 4
The vibrations of a and the coil 5 can be suppressed.

As described above, according to this embodiment, the vibration of the stator yoke 4 can be suppressed by providing the buffer material 12 which receives the compressive force between the stator yoke 4 and the chassis 6 at the center of the stator yoke 4.

Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a sectional view of a planar brushless motor showing a second embodiment of the present invention. In the figure, 4a is a stator plate;
5 is the stator coil, 6 is the chassis, and the above are the first
The configuration is similar to that shown in the figure. The difference from the configuration shown in FIG. 1 is that a step is provided at the lower end of the new housing 13.

The planar brushless motor configured as described above will be explained.

A step is provided on the lower end surface of the housing 13 attached to the chassis 6 to position the cushioning material 14 similar to that in the first embodiment. The vibration of the stator plate 4a and the stator coil 5 caused by the attraction and repulsion between the stator coil 5 and the rotor magnet 1 when the motor rotates is suppressed by receiving the vibration between the lower end surface and the center of the stator plate 4a.

Effects of the Invention As described above, the present invention includes a stator yoke having a rotor magnet magnetized alternately with north and south poles, a stator coil disposed opposite to the rotor magnet, and a stator yoke. A planar brushless motor having a means for fixing an outer circumferential portion to a boss portion of a chassis, wherein a buffer member is provided in the center of the stator yoke to receive a compressive force between the stator yoke and the chassis. The position where the stator yoke vibrates the most due to the attraction and repulsion of the stator coil and rotor magnet during rotation is elastically held by the cushioning material, thereby suppressing the vibration of the stator yoke. This makes it possible to create a flat-faced brushless motor with high-precision rotational performance and quietness.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a planar brushless motor according to a first embodiment of the present invention, FIG. 2 is a sectional view of a planar brushless motor according to a second embodiment of the present invention, and FIG. 3 is a sectional view of a conventional brushless motor. FIG. 2 is a cross-sectional view of a planar facing type brushless motor. 4a... Stator plate, 5... Stator coil, 6... Chassis, 12... Cushioning material, 13...
...housing, 14...buffer material.

Claims (1)

[Claims for Utility Model Registration] (1) A stator yoke having a rotor magnet magnetized alternately with N and S poles and a stator coil disposed opposite the rotor magnet, and the stator yoke. A flat-faced brushless motor comprising means for fixing an outer circumferential portion of the motor to a boss portion of a chassis, wherein a cushioning member is provided at the center of the stator yoke and receives a compressive force between the stator yoke and the chassis. A flat-faced brushless motor characterized by: (2) The lower end surface of the housing attached to the chassis has a step for positioning a buffer material, and the buffer material receives compressive force from the stator yoke and the lower end surface of the housing at the center of the stator yoke. A planar opposed brushless motor according to claim 1, characterized in that: