JPH07203650A - Electromagnetic motor - Google Patents

Abstract

PURPOSE:To provide a motor having a structure for preventing transmission of vibration, generated between the stator core and a driving magnet, to the motor case. CONSTITUTION:The electromagnetic motor comprises a rotor 3 bonded with a driving motor, a section 5 for transmitting the rotary power of the rotor 3, a rotary shaft 4 press fitted to the transmitting section 5, bearing members 6, 8 for supporting the rotary shaft 4, and a stator section 17 applied with a stator coil 16, wherein vibration isolating means 10 are disposed between the bearing members 6, 8 and the stator section 17 and the motor case 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic motor used for, for example, a tape recorder or a magneto-optical disk drive.

[0002]

2. Description of the Related Art As an electromagnetic motor of this type (hereinafter referred to as "motor"), there is one disclosed in Japanese Patent Application Laid-Open No. 4-193045. This conventional motor has an anti-vibration structure, and its configuration is shown in FIG. As shown in the figure, in this motor, a vibration isolating member 55 is interposed between a bearing base 52 fixed to a motor case 51 at a plurality of locations by caulking and a bearing 54 in which a rotary shaft 53 is inserted. . The vibration isolator 55 is a cup-shaped member having a shaft through hole 56 on the bottom surface and a peripheral wall 57 having a length larger than the thickness of the bearing 54, and is assembled into the bearing base 52 by press fitting together with the bearing 54. There is. Further, in this conventional motor, the vibration when the rotating shaft 53 rotates is made difficult to be transmitted to the device to which the motor is attached by the vibration isolating member 55 interposed between the bearing 54 and the bearing base 52.

[0003]

However, most of the vibration of the motor is caused by attraction or repulsion between the status core and the driving magnet. Therefore, in the conventional motor,
Since there is no anti-vibration member between the vibration source and the motor case 51, the vibration is transmitted to the motor case 51 and is transmitted to the entire device through the attachment part of the device such as the tape recorder to which the motor case 51 is attached. I will end up.

The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide a motor having a structure in which the vibration generated between the stator core and the driving magnet is not transmitted to the motor case.

[0005]

In order to solve the above-mentioned problems, the present invention relates to a rotor having a drive magnet fixed thereto, a transmission portion for transmitting the rotational force of the rotor, and a rotation press-fitted into the transmission portion. In an electromagnetic motor having a shaft, a bearing member that supports a rotating shaft, and a stator portion around which a stator coil is wound, vibration damping means is provided between the bearing member, the stator portion, and the motor case. Is characterized by.

[0006]

According to the present invention, since the vibration isolator is provided between each of the bearing member, the stator portion and the motor case, the vibration caused by the rotating shaft of the motor is caused between the bearing member and the motor case. The vibration isolation means provided makes it difficult to transmit. Further, among the vibrations generated by the attraction and repulsion between the stator part and the driving magnet, the vibrations that are about to be transmitted from the stator part to the motor case are difficult to be transmitted by the vibration isolator arranged between the stator part and the motor case. Become. Further, the vibration that is about to be transmitted from the drive magnet to the motor case is transmitted to the bearing member via the rotor to which the drive magnet is fixed, the transmission portion, and the rotating shaft. The anti-vibration member provided makes it difficult to transmit. After all, vibrations generated between the stator part and the drive magnets are less likely to be transmitted to the motor case by the vibration isolation means respectively arranged between the bearing member, the stator part and the motor case.

[0007]

[Embodiment 1] Embodiment 1 to which the present invention is applied will be described with reference to the half sectional view shown in FIG.

(Structure) Reference numeral 1 in the figure is a motor,
The motor 1 includes a rotor 3 to which a driving magnet 2 magnetized in multiple poles is fixed. A pulley 5 in which a rotary shaft 4 is press-fitted is crimped to the rotor 3, and the pulley 5
A belt (not shown) is stretched around. The rotary shaft 4 is inserted in the bearing 6 and is supported by the slide washer 7. The bearing 6 is fixed to a bearing holder 8, and the bearing 6 and the bearing holder 8 form a bearing member.

A concave portion 9 is formed on the outer peripheral surface of the bearing holder 8, and the concave portion 9 is fitted to a protrusion 11 formed on the inner peripheral surface of the vibration isolating member 10 and the bearing holder 8 is mounted on the tome. By fitting the plate 12 into the first groove 13 formed on the inner peripheral surface of the vibration isolating member 10 as well, the bearing holder 8
Are fixed to the vibration isolator 10. By fitting a part of the protrusion 11 into the recess 9, the vibration of the rotating shaft 4 is less likely to be transmitted to the vibration isolating member 10. Further, on the outer peripheral surface of the vibration isolation member 10, the stator core 14, the bobbin 15 integrally formed of an insulating member such as resin, and the stator coil 1 wound around the stator core 14 with the bobbin 15 interposed therebetween.
A stator portion 17 composed of 6 is attached. Further, the second groove 18 formed in the vibration isolating member 10
All members are fixed to the motor case 20 by fitting the board 19 to the fixed motor case 20.

(Operation) A magnetic response element (not shown) on the substrate 19 detects a magnetic pole of the drive magnet 2, and a drive circuit (not shown) applies a current to the stator coil 16 to excite the stator coil 16 according to the detected magnetic pole. To do. And
A torque acts between the stator coil 16 and the driving magnet 2 to rotate the rotor 3 and the pulley 5, and the belt wound around the pulley 5 transmits the rotational force of the motor 1. In this case, the stator core 14 and the driving magnet 2
Vibration due to suction and repulsion between them and vibration due to the rotating shaft 4 occur. However, since the vibration damping member 10 is arranged between each of the bearing holder 8, the stator portion 17 and the motor case 20, the vibration caused by the rotating shaft 4 of the motor 1 is generated between the bearing holder 8 and the motor case 20. Anti-vibration member 10 disposed in
It becomes difficult to be transmitted by. In addition, among the vibrations caused by the attraction and repulsion between the stator portion 17 and the driving magnet 2,
Vibrations that are about to be transmitted from the stator portion 17 to the motor case 20 are less likely to be transmitted by the vibration isolation member 10 arranged between the stator portion 17 and the motor case 20. Further, the vibration that is about to be transmitted from the drive magnet 2 to the motor case 20 is transmitted to the bearing holder 8 via the rotor 3 to which the drive magnet 2 is fixed, the pulley 5 and the rotary shaft 3, but the bearing holder 8 and the motor case. Between 20, the vibration-proof member 10 disposed between them makes it difficult for the vibration to be transmitted. After all, the vibrations generated between the stator portion 17 and the drive magnet 2 are less likely to be transmitted to the motor case 20 by the vibration isolating members 10 respectively arranged between the bearing holder 8, the stator portion 17 and the motor case 20. Become. In addition, between the bearing holder 8 and the vibration isolation member 10, only a part of the protrusion 11 and the recess 9 and the tome plate 12 and the first groove 13 are fitted, respectively, so that the rotary shaft 4 and the drive magnet are The vibration caused by 2 becomes even harder to transmit.

(Effect) As described above, according to the first embodiment, the vibration caused by the attraction and repulsion of the driving magnet 2 and the stator core 14 and the vibration caused by the rotating shaft 4 cause the motor case 20 to be attached to a device such as a tape recorder. Is less likely to be transmitted to, and the vibration of the entire device can be reduced.

[0012]

Second Embodiment Next, a second embodiment to which the present invention is applied will be described with reference to the half sectional view shown in FIG.

(Structure) In this embodiment, the same structures as those of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. The present embodiment is different from the first embodiment in that, unlike the vibration isolator 10 of the first embodiment, the inner peripheral surface of the vibration isolator 22 is made flat and the projections 24 of the bearing holder 23 are formed in a sawtooth shape. It is in.

(Operation) In this embodiment as well, as in the first embodiment, the vibration isolating member 22 is provided between each of the stator portion 17, the motor case 20, and the bearing holder 23. , The vibration becomes difficult to be transmitted. In addition, between the bearing holder 23 and the vibration isolating member 22, the tip end portion of the projection 24 and the inner peripheral surface of the vibration isolating member 22, and the tome plate 12 and the first portion.
Since the grooves 13 are simply fitted into each other, the contact area is reduced, and the vibration caused by the rotating shaft 4 and the driving magnet 2 is less likely to be transmitted.

(Effect) As described above, according to the second embodiment, the contact area between the vibration isolating member 22 and the bearing holder 23 is smaller than that of the first embodiment, and the transmission of vibration to the device is further reduced. . Further, since the shape of the inner peripheral surface of the vibration isolating member 22 is formed into a linear shape, it becomes easy to mold and the cost can be reduced.

[0016]

Third Embodiment Next, a third embodiment to which the present invention is applied will be described with reference to the half sectional view shown in FIG.

(Structure) Also in this embodiment, the same structures as those of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. The present embodiment is different from the first embodiment in that the bobbin 15 of the stator portion 17 of the first embodiment is integrally formed with the bearing holder 30, and the stator core 14 is directly fixed to the bearing holder 30. The bobbin, that is, the bearing holder 30 and the motor case 2 to which the substrate 19 is fixedly attached.
An anti-vibration member 31 made of rubber is disposed between 0 and the anti-vibration member 31, and the anti-vibration member 31 is fixed to the bearing holder 30. Then, by fitting the motor case 20 into the groove 18 of the vibration isolating member 31, all the members of the motor 1 are fixed to the motor case 20.

(Operation) In this embodiment as well, as in the first embodiment, the vibration isolating member 31 is provided between each of the stator portion 17, the motor case 20, and the bearing holder 30. , It becomes difficult for the vibration to be transmitted to the device.

(Effect) As described above, according to the third embodiment, as in the first embodiment, it becomes difficult for vibration to be transmitted to the device.
In addition, the bobbin of the stator portion 17 and the bearing holder 30
Since they are integrated, the number of parts is small and the cost can be reduced.

[0020]

Fourth Embodiment Next, a fourth embodiment to which the present invention is applied will be described with reference to a half sectional view shown in FIG.

(Structure) This embodiment is a modification of the third embodiment, and the same structures as those of the third embodiment are designated by the same reference numerals and the description thereof will be omitted. The present embodiment is different from the third embodiment in that the vibration damping member 35 has a thicker wall and a simpler shape than the vibration damping member 31 of the third embodiment. The vibration isolator 35 is an ether polyurethane made of polyol MDI, which has been specially devised at the stage of designing the molecular structure, and has a higher impact energy absorption rate than other materials. And the substrate 19
The motor case 20 to which the
And all the members of the motor 1 are fitted to the motor case 20.
It is the same as the third embodiment in that it is fixed to.

(Operation) In this embodiment as well, as in the first embodiment, the vibration isolating member 35 is disposed between the stator portion 17, the motor case 20, and the bearing holder 30, respectively. The vibration is less likely to be transmitted to the device.

(Effects) As described above, according to the fourth embodiment, vibration is less likely to be transmitted to the device, as in the first embodiment.
In addition, the shape of the vibration isolator 35 is the same as that of the vibration isolator 31 of the third embodiment.
Compared with the above, the wall thickness becomes thicker, the rigidity of the vibration damping member 35 becomes higher, and the rigidity of the entire motor 1 becomes higher. Also,
The vibration isolator 35 has a simple shape and is easy to mold,
As a result, the cost can be reduced.

[0024]

Fifth Embodiment Next, a fifth embodiment to which the present invention is applied will be described with reference to the half sectional view shown in FIG.

(Structure) Also in this embodiment, the same structures as those in Embodiment 1 are designated by the same reference numerals, and the description thereof will be omitted. This embodiment is different from the first embodiment in that the bearing holder 8 of the first embodiment and the bobbin 15 of the status portion 17 are
It is integrated with a vibration-proof member 37 made of resin. The vibration-proof member 37 has a motor case 20 to which a substrate 19 is fixed, and the stator core 1 of the stator section 17.
4 are fixed respectively. Further, the vibration isolating member 37 is formed with notches 38 and 39, and the vibration isolating member 37 exerts a vibration isolating function by the function of the notches 38 and 39.

(Operation) In the present embodiment, the notches 38, 3 are provided between the stator portion 17, the motor case 20, and the vibration isolating member 37 having a function as a bearing holder.
9 is present, the notches 38 and 39 serve as a vibration isolating member, and vibration is less likely to be transmitted to the device.

(Effects) As described above, according to the fifth embodiment, as in the first embodiment, vibration is less likely to be transmitted to the device.
In addition, the number of parts is further reduced as compared with the fourth embodiment, and the assembly can be facilitated and the cost can be reduced.

[0028]

Sixth Embodiment Next, a sixth embodiment to which the present invention is applied will be described with reference to the half sectional view shown in FIG.

(Structure) This embodiment is a modification of the fifth embodiment when it is used for an optical disk. The same structures as those of the fifth embodiment are designated by the same reference numerals and the description thereof will be omitted.
The present embodiment is different from the fifth embodiment in that a rotor 41 has a disk attraction magnet 42 and a multi-pole magnetized drive magnet 2.
Is fixed, and the rotary shaft 43 is press-fitted into the rotor 41. The rotation force of the rotor 41 is the attraction force of the disc attraction magnet 42, and
It is transmitted to an optical disk (not shown) positioned by the disk supporting surface 44 of No. 3 and the disk mounting surface 45 of the rotor 41.

(Operation) Also in the present embodiment, as in the first embodiment, the stator portion 17, the motor case 20,
There are notches 38 and 39 between each of them and the anti-vibration member 37 that functions as a bearing holder.
8, 39 function as a vibration isolating member, and it becomes difficult for vibration to be transmitted to the device.

(Effect) As described above, according to the sixth embodiment, vibration is less likely to be transmitted to the device as in the fifth embodiment.
In addition, it can be used for an optical disk, the number of parts can be further reduced as compared with the fourth embodiment, and the assembling can be facilitated and the cost can be reduced.

In the present embodiment, a plurality of types of anti-vibration means have been described as an example, but the present invention is not limited to this, and any shape can be used without changing the gist of the present invention. It is possible.

[0033]

As described above, according to the present invention, the vibration isolating member is arranged between each of the bearing holder, the stator portion including the stator core, the bobbin and the stator coil, and the motor case to which the substrate is fixed. By arranging it, it is possible to prevent vibration of the rotating shaft, vibration between the stator part and the driving magnet from being attracted or repulsed to the motor case, and to prevent vibration of a device such as a tape recorder to which the motor is attached. . In addition, since the vibration isolator is arranged inside the motor, the volume of the motor can be reduced and the size of the device for mounting the motor can be reduced.

[Brief description of drawings]

FIG. 1 is a half side sectional view of an electromagnetic motor according to a first embodiment of the present invention.

FIG. 2 is a half side sectional view of an electromagnetic motor according to a second embodiment of the present invention.

FIG. 3 is a half side sectional view of an electromagnetic motor according to a third embodiment of the present invention.

FIG. 4 is a half side sectional view of an electromagnetic motor according to a fourth embodiment of the present invention.

FIG. 5 is a half side sectional view of an electromagnetic motor according to a fifth embodiment of the present invention.

FIG. 6 is a half side sectional view of an electromagnetic motor according to a sixth embodiment of the present invention.

FIG. 7 is a side sectional view of a conventional motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromagnetic type motor 2 Driving magnet 3 Rotor 4 Rotating shaft 5 Pulley 6 Bearing 8,23,30 Bearing holder 10,22,31,35,37 Anti-vibration member 16 Stator coil 17 Stator section 20 Motor case

Claims (1)

[Claims] 1. A rotor to which a driving magnet is fixed, a transmission portion for transmitting the rotational force of the rotor, a rotation shaft press-fitted into the transmission portion, a bearing member supporting the rotation shaft, and a stator. An electromagnetic motor having a stator portion around which a coil is wound, wherein vibration damping means is provided between each of the bearing member, the stator portion, and the motor case.