JPH052557U - Coreless motor - Google Patents

Abstract

(57) [Abstract] [Purpose] In a cylindrical coreless motor having a structure in which the shaft does not pass through the field magnet, a distance between the bearings of the rotor is secured, and amplification of vibration during rotation of the cylindrical coil is suppressed. [Structure] A rotor having a ring-shaped bearing plate attached to one end of a cylindrical coil, a bearing fixed to the center of a brush house attached to one end of a cylindrical housing case, and a magnet support shaft attached to the other end. The bearing distance between which the field magnet is sandwiched is obtained by supporting with the field magnet.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention relates to a bearing structure for a rotor of a small coreless motor. .

[0002]

[Prior art]

  In the conventional cylindrical coreless motor shown in FIG. 3, a hollow cylindrical field magnet is mainly used. Used for a cylinder coil 1, a coil support 2, and a community formed on this support. Rotor comprising a shaft 3 fixed to the support 3 through the center of the support 3. Is the end of the hollow cylindrical field magnet 5 with the shaft 4 passing through the hollow cylindrical field magnet. Side bearing 6 and bearing 7 arranged on the other end side are supported. It was.

[0003]   The inventor of the present invention filed an application for such a structure in order to reduce the size of the motor. In Japanese Patent Application No. 3-17116, the magnet molding process for penetrating the shaft into the magnet is omitted. For the sake of brevity, we devised the structure of a microminiature motor using a smaller cylindrical magnet. Shown in Figure 2 In the previous invention, the rotor is attached to the magnet support 9 at one end of the cylindrical housing case 8. Bearing 11 mounted on the tip of fixed cylindrical field magnet 10 and housing case 8 is supported by a bearing 13 mounted in a brush house 12 arranged on the other end side of , Thrust the hard bearing plate 14 from the housing case side of the shaft 4 opposite to the magnet. The output shaft, and place the bearing on the shaft side of the cylindrical field magnet 10. I was letting.

[0004]

[Problems to be solved by the device]

  In this way, the cylindrical coil of the rotor is conventionally supported by a cantilever structure, It has a drawback that it easily shakes with respect to the rotating shaft. Therefore, change the rotor structure and To improve the cause of occurrence of vibration and suppress the amplification of shake when the rotation speed increases. And became necessary. Also, if a magnet without holes is used, the bearing will be Two parts are required on the motor side, and in order to obtain a wide bearing spacing due to the structure, The increase is indispensable and has been regarded as a challenge for motor miniaturization.

[0005]

[Means for Solving the Problems]

  The present invention relates to a cylindrical coil and a cylindrical coil support in a conventional cylindrical coreless motor. From the holding body, the commutator formed on this support, and the shaft fixed to the support A new ring-shaped bearing plate is placed on the other end of the cylindrical coil support A cylindrical coil support that was cantilevered up to now can be achieved by fitting the magnet support shaft The structure is double-supported, and the structure that suppresses the vibration amplification during high-speed rotation of the rotating shaft is adopted.

[0006]   In the above invention, the rotor shaft is located at one end of the cylindrical housing case. At the center of the bearing and brush house formed at the tip of the fixed cylindrical field magnet Since it is supported by a fixed bearing, the bearing spacing is narrow and the cylindrical coil side bar is If the lance could not be taken, make a cylindrical coil part of the structural rigid body of the rotor Insert a ring-shaped bearing plate on the other end of the support to sandwich the cylindrical field magnet. A wide axial distance can be secured, and core runout on the rotor cylindrical coil side at high speeds can be prevented. And

[0007]

[Example 1]   FIG. 1 is a structural diagram of a coreless motor of the present invention. One end side of housing case 8 A magnet support 16 having a shaft portion 15 formed is attached to the The fixed cylindrical field magnet 10 and the adhesive ring 17 are bonded together, and the inner diameter of the adhesive ring 17 It is crimped and fixed to the part 15. On the other hand, a bearing 18 is provided on the other end of the housing case 8. And the brush house 12 that holds the brush 19 are installed, and the fixed consisting of these The child holds the rotor.

[0008]   The rotor is a cylindrical coil 1 located around a cylindrical field magnet 10 and one end face side thereof. A coil support 2 for fixing the coil, and a commutator 3 formed on the coil support 2. It is composed of a shaft 4 fixed at the center and contains a cylindrical field magnet 10 on the other end side. So that the ring-shaped bearing plate 20 is supported by the shaft portion 15 formed on the magnet support member 16. There is.

[0009]   The end of the shaft 4 on the magnet side is made substantially spherical and is fixed to the end of the cylindrical field magnet 10 by adhesion. Of the brush house 12 by making contact with the hard bearing plate 14 to receive the thrust. The bearing distance between the bearing 18 located at the center and the shaft portion 15 on the magnet support 16 side is obtained. or, When assembling the rotor, the cylindrical coil 1 and the ring-shaped bearing plate 20 are bonded and fixed to each other by the magnet support member 16. One or more open holes were passed through the end face of the, and adhesive filling was performed using a special jig.

[0010]

Example 2   FIG. 4 is a structural diagram of another embodiment of the present invention. Cylindrical field magnet in Example 1 10 is a hollow cylindrical field magnet 5, and a shaft portion 15 formed on a magnet support 16 is extended to be hollow. The field magnet is held directly by being inserted into the inner diameter of the cylinder, and it is adhesively fixed to the tip of the shaft part 15. The hard bearing plate 14 serves as a thrust receiver for the shaft 4.

[0011]   The structure of the rotor is the same as that of the first embodiment, including the cylindrical coil 1 and a coil for fixing one end surface side thereof. Fixed to the center of the coil support 2 and the commutator 3 formed on the coil support 2. And a hollow cylindrical field magnet 5 on the other end side. The ring-shaped bearing plate 20 is supported by the shaft portion 15 formed on the magnet support 16.

[0012]

[Effect of device]

  The present invention cantilevers the cylindrical coil by the coil support found in the conventional rotor structure. As a supporting structure, a cylindrical coil is incorporated as a part of the structural rigid body of the rotor. By changing to a support structure where a support point is installed on the side, in the high rotation range of the cylindrical coil Prevents deformation of the motor and facilitates assembly and adjustment of the motor, and amplifies runout during rotation of the entire motor. It became possible to hold down.

[0013]   Further, one side of a field magnet such as the coreless motor of the previous application using a columnar field magnet. Compared to a motor with two bearings in the center, the present invention effectively uses the full width of the motor. It is possible to obtain a rotor having two bearing spacing distances, and The overall length of the ring was able to be designed short.

[Brief description of drawings]

FIG. 1 is a sectional view of a coreless motor of the present invention.

FIG. 2 is a sectional view of a coreless motor previously filed by the present inventor.

FIG. 3 is a sectional view of a conventional coreless motor.

FIG. 4 is a sectional view of another embodiment of the coreless motor of the present invention.

[Explanation of symbols] 1 cylindrical coil 2 coil support 3 commutator 4 shafts 5 Hollow cylindrical field magnet 6 bearings 7 bearings 8 housing case 9 Magnet support 10 cylindrical field magnet 11 Bearing 12 brush house 13 Bearing 14 Hard bearing plate 15 Shaft 16 magnet support 17 Adhesive ring 18 bearings 19 brushes 20 ring bearing plate

Claims (2)

[Scope of utility model registration request] 1. A rotor comprising a cylindrical coil, a support for the cylindrical coil, a commutator formed on the support, and a shaft fixed to the support in a cylindrical coreless motor so as to include a cylindrical field magnet. A bearing and a brush, which are integrally formed with a support and a shaft at one end of a cylindrical coil and a ring-shaped bearing plate at the other end, and whose rotor is fixed to the center of a brush house attached to one end of a cylindrical housing case. A coreless motor characterized by being supported by a magnet support shaft attached to the other end of the house. 2. The coreless motor according to claim 1, wherein the columnar field magnet is a hollow cylindrical field magnet, and the magnet support shaft portion is inserted and fixed in the hollow cylindrical field magnet.