JPS61142941A - Motor - Google Patents

Abstract

PURPOSE:To reduce a thrust load applied to a thrust member, by providing an elastic member between a salient section provided for a bearing cage, and a secondary bearing member fitted loosely at the secondary position of the bearing cage. CONSTITUTION:A thrust load due to a magnetic attraction force generated by a stator 26 and a rotor 20 for a motor is, at first, applied to an elastic member 42 via secondary bearing member 23. The thrust load is reduced by the elasticity of the elastic member 42, and the reduced thrust load is to be applied to a thrust member 28. In this manner, the thrust load due to the magnetic attraction force working between the rotor 20 and the stator 26 can be arranged to be applied uniformly to the thrust member 28 and the elastic member 42, and the thrust load applied to the thrust member 28 can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flat-faced type motor that is effective for use in, for example, a tape drive device.

2. Description of the Related Art In recent years, home video tape recorders (VTRs) using tape cassettes have become smaller and thinner.

An example of the conventional motor mentioned above will be described below with reference to the drawings. FIG. 2 is a side sectional view of a conventional planar opposed type motor. In FIG. 2, 10 is a bearing device;
12 is a motor section. The rotating shaft 14 is press-fitted into a rotor 20 consisting of a permanent magnet 16 and a rotor plate 18, and is rotatably supported by a bearing member 22.

The bearing member 22 is press-fitted into a predetermined position of a cylindrical bearing housing 24, and is made of an oil-impregnated bearing or a ball bearing with a small coefficient of friction so as to reduce the load and load fluctuation on the rotating shaft 14.

A thrust member 28 that adjusts the gap between the stator 26 and the rotor 20 and receives a thrust load due to the magnetic attraction force generated by the stator 26 and the rotor 20 is screwed into the upper end of the bearing housing 24. There is. The stator 26 is formed of a stator printed circuit board 32 made of a ferromagnetic material and having electrical wiring on its upper surface, and stator coils 34 fixed to the stator printed circuit board 32 by adhesive at equal intervals. The rotor 20 rotates together with the rotary shaft 14 supported by the bearing member 22 under the action of the rotating magnetic field generated by the stator coil 34, and the magnetic tape 3o is transferred at a predetermined speed by the one-rotation shaft 14 and the pressure bonding member 36.

In the conventional motor configured as described above, the gap between the stator 26 and the rotor 20 is adjusted in order to obtain predetermined motor characteristics. This adjustment is performed by rotating the thrust member 28 screwed into the upper end of the bearing housing 24 and moving the rotary shaft 14 downward or upward.

Problems to be Solved by the Invention However, in the above configuration, the thrust member 28 receives all the thrust load due to the magnetic attraction force generated by the stator 26 and the rotor 20, so the thrust member 28 is worn out and The motor characteristics of the motor cannot be maintained, and furthermore, there is a problem in that the stator 26 and the rotor 20 come into contact with each other due to increased wear. Furthermore, thrust member 2
There is also a problem in that the load and load fluctuation increase due to wear of the parts 8, resulting in poor performance such as wow and flutter.

In view of the above problems, the present invention provides a motor using a bearing device that divides the thrust load due to the magnetic attraction force generated by the stator and rotor between the bearing member and the thrust member, thereby minimizing wear on the thrust member. This is what we provide.

Means for Solving the Problems In order to solve the above problems, the motor of the present invention includes: a rotating shaft; a rotor including a permanent magnet fixed to the rotating shaft and rotating integrally; and the rotor. a stator including a magnetic material that faces the stator winding and fixes the stator winding in a predetermined position; first and second bearing members that rotatably support the rotating shaft; and a central portion having a hole. a bearing housing having a cylindrical protrusion, the first bearing member being fitted in a first position, and the second bearing member loosely fitting in a second position; an elastic member interposed between the protrusion and the second bearing member; a thrust member that engages with the upper end of the rotating shaft and adjusts the gap between the rotor and the stator to a predetermined distance; The rotor and the second bearing member are engaged with each other.

Operation The present invention has the above-described configuration so that the thrust load due to the magnetic attraction force acting between the rotor and the stator is almost equally received by the thrust member and the elastic member via the second bearing member. By doing so, the wear of the thrust member is minimized.

EXAMPLE Hereinafter, a motor according to an example of the present invention will be described with reference to one drawing. FIG. 1 shows a side sectional view of a motor according to an embodiment of the present invention.

In FIG. 1, 10 is a bearing device, and 12 is a motor section. The rotating shaft 14 is press-fitted into a rotor 20 consisting of a rotor magnet 16 and a rotor plate 18.
It is rotatably supported by a first bearing member 22 and a second bearing member 23. The cylindrical bearing housing 24 has a protrusion 4o with a hollow hole in the center, and allows the first bearing member 22 to be fitted in the first position and the second bearing member 23 to be fitted in the second position. It is loosely fitted in the position. Further, in the bearing housing 24, an elastic member 42 made of a coil spring or the like is installed between the protrusion 40 and the second bearing member 23. The first bearing member 22 and the second bearing member 23 are made of oil-impregnated bearings, ball bearings, or the like having a small coefficient of friction so as to reduce the load on the rotating shaft 14 and load fluctuations. The second bearing member 23 is adapted to engage the rotor 20. A stator 26 is provided at the upper end of the bearing housing 24.
In addition to adjusting the gap between the rotor 2o and the rotor 2o.

A thrust member 28 that receives a thrust load due to the magnetic attraction force generated by the stator 26 and rotor 20 is screwed together. The stator 26 is formed of a stator printed circuit board 32 made of a ferromagnetic material and having electrical wiring on its upper surface, and stator coils 34 fixed to the stator printed steam 32 by adhesive at equal intervals. The rotor 20 rotates together with the rotating shaft 14 supported by the first bearing member 22 and the second bearing member 23 due to the action of the rotating magnetic field generated by the stator coil 34 .

The motor configured as described above has a stator 26 and a rotor 2.
The thrust load due to the magnetic attraction force generated by the magnetic force is first applied to the elastic member 42 via the second bearing member 23. By applying the entire thrust load to the elastic member 42, the thrust load is reduced due to the elasticity of the first elastic member 42, and this reduced thrust load is applied to the thrust member.

As described above, according to this embodiment, the elastic member is provided between the protrusion provided on the bearing housing and the second bearing member loosely fitted in the second position of the bearing housing. The thrust load due to the magnetic attraction force acting between the rotor and the stator can be received almost equally by the thrust member and the elastic member, and the thrust load applied to the thrust member can be reduced.

Effects of the Invention As described above, the present invention provides a rotor including a rotating shaft, a permanent magnet fixedly fixed to the rotating shaft and rotating integrally with the rotor, and a stator winding arranged in a predetermined position facing the rotor. A stator including a magnetic material fixed in position, first and second bearing members rotatably supporting the rotating shaft, and a full-thickness cylindrical protrusion with a hollow hole in the center. the first bearing member
a bearing housing that is fitted in the second position, and the second bearing member is loosely fitted in the second position; and a coil spring or the like that is interposed between the protrusion and the second bearing member. an elastic member; and a thrust member that engages with the upper end of the rotating shaft and adjusts a gap between the rotor and the stator to a predetermined distance; The thrust load due to the magnetic attraction force acting between the rotor and the stator is almost equally received by the elastic member via the thrust member and the second bearing member. , the thrust load M applied to the thrust member can be reduced, and wear of the thrust member can be minimized. Further, since the wear of the thrust member is minimized, there is no increase in load and load fluctuation, and the motor characteristics can maintain their initial performance.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a motor according to an embodiment of the present invention, and FIG. 2 is a side sectional view of a conventional motor. 14...Rotating shaft, 20...Rotor, 2
2...First bearing member, 23...Second
bearing member, 24...bearing housing, 26...
・Stator, 28... Thrust member, 40...
...Protrusion, 42...Elastic member. Name of agent: Patent attorney Toshio Nakao and 1 other person14
,,'@ dry axis 2ρ ・Ti1 Matsuko? ? ,... 10th ★ Autopsy material 23 · Recruitment 2 bearing member Fig. 1 24...! 111I mourning body? 4
．． ．． ．． @Spore PI3.2971 member protrusion 42 ・3 grass 1 part ^o? 8

Claims (1)

[Claims] A rotor comprising a rotating shaft, a permanent magnet that fixes the rotating shaft and rotates integrally with the rotating shaft, and a magnetic material that fixes a stator winding in a predetermined position facing the rotor. a stator, first and second bearing members that rotatably support the rotating shaft, and a cylindrical protrusion with a hollow hole in the center, and the first bearing member is connected to the first bearing member. a bearing housing in which the second bearing member is loosely fitted in the second position; an elastic member interposed between the protrusion and the second bearing member; a thrust member that engages with the upper end of the rotating shaft and adjusts a gap between the rotor and the stator to a predetermined distance; the thrust member engages the rotor and the second bearing member to prevent the rotation A motor characterized in that the thrust load due to the magnetic attraction force acting between the child and the stator is substantially equally received by the elastic member via the thrust member and the second bearing member.