JP3362128B2 - Cylindrical DC motor with a flat outer surface and its mounting structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless calling device,
A radial outside suitable for use as a silent notification source for mobile communication devices
The present invention relates to a cylindrical DC motor having a flat surface and a mounting structure thereof.

[0002]

2. Description of the Related Art A cylindrical coreless motor as shown in FIG. 4 is known as a cylindrical small DC motor used as a silent notification source for pagers, alarms, mobile communication devices and the like. In order to use the motor as a vibration source, a high-density eccentric weight W made of tungsten alloy is arranged on the output shaft S of the motor to generate vibration by centrifugal force during rotation.

[0003]

However, such a cylindrical type is inconvenient to handle when it is mounted on a device.
There is a disadvantage that it has to be separately mounted on a printed wiring board or the like via a mounting angle or the like like -308170. If it is a flat type motor, it can be directly fixed to a printed wiring board or the like via a double-sided adhesive tape on the bottom surface or the top surface as disclosed in Japanese Utility Model Laid-Open No. 5-72184. Some recent double-sided pressure-sensitive adhesive tapes reach 2 kg per 1 cm of adhesive strength, which is sufficient for practical use.

It is an object of the present invention that the occupying arrangement space is almost the same whether it is a cylindrical type or a rectangular type on the device side, and the device can be mounted on a printed wiring board or the like without requiring a mounting angle or the like. Is to
Another object is to increase the permeance coefficient to provide a cylindrical DC motor and a mounting structure for the same, which aims at high efficiency.

[0005]

In order to solve the above-mentioned problems, as in the invention described in claim 1, N and S poles are magnetized in a cylindrical case (1) which is long in the axial direction. A small direct current motor comprising a radial field magnet (2) and a rotor having an armature coil (5) arranged inside the magnet with a radial gap between the radial field magnet and the rotor.
The magnetic magnet has a thick magnetic pole center on the inner surface of the case.
The inner end of the magnetic pole is thin and the inside is almost cylindrical.
It is arranged to have a space, and the case has a small outer surface.
Some of them can be laid down directly on the printed wiring board (6) and fixed.
Such a flat surface, and the case flat in the opening of this case.
A bracket (8) having a flat surface formed in the same shape as the surface
Inset and solder connection directly from this bracket to the printed wiring board
This can be achieved by deriving the possible terminal (9) only in the axial direction . Specifically, as in the invention described in claim 2, the case (1) and the bracket (8) have a substantially square cross section so that the case (1) and the bracket (8) can be mounted on the printed wiring board (6). It is preferable that one side of this square is directly laid down and fixed on the printed wiring board.
In addition, as described in claim 3, the rotor is electrically charged to the outer peripheral portion.
Inside the armature coil, the armature coil (5) is wound
It is preferable that the core is composed of an eccentric slotless core (3) . In order to mount such a motor on a printed wiring board, as shown in claim 4, a cylindrical type long in the axial direction is used.
In the case (1), the radial field magnetized to the N and S poles.
Type magnet (2) and radial direction inside this magnet
A row having an armature coil (5) arranged through an air gap
The small DC motor mounting structure that accommodates the
The radial field magnet on the inner surface of the case.
The center of the magnetic pole is thick and the end of the magnetic pole is thin, and
The case is arranged so as to have a substantially cylindrical space inside.
Lay it directly on the printed wiring board on at least part of the outer surface
Has a flat surface that can be set , and
Bracket having a flat surface formed in the same shape as the flat surface of the case
Insert (8) and connect it to the printed wiring board from this bracket.
Connect the connectable terminal only in the axial direction, and
Take care when fixing the flat surface of the racket to the printed wiring board.
Do not use attachment angles, etc.
Directly connect the terminals to the specified pattern (6a, 6b) on the wiring board.
It is designed to be attached to equipment by soldering connection
It may be set to.

With the above arrangement, since it is rectangular, it can be fixed to a printed wiring board or the like by adhesion with a double-sided adhesive tape or the like. In the field magnet, since the center of the magnetic pole is thick and the end of the magnetic pole is thin, the substantial permeance coefficient is large. Therefore, a sine curve can be obtained for the magnetization, and the cogging torque can be reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is applied to a square tube type slotless vibration motor, and is shown in a sectional view showing the features of the present invention. Reference numeral 1 is a case having a square tube shape and a square cross section, and a field magnet 2 made of a rare earth plastic is integrally formed therein. This field magnet 2 is magnetized into four equal poles alternately in N and S so that the center of the magnetic pole is at the corner of the case, and the inside is cylindrical, and 3 is the field magnet 2. An eccentric slotless core formed by laminating silicon steel plates arranged with a gap inside, and a rotor is formed by arranging 6 armature coils 5 with a shaft 4 in the center and a thin insulator 5a on the outer periphery. is doing. Reference numeral 3a is a through hole that emphasizes the amount of eccentricity.

FIG. 2 shows a structure in which the printed wiring board 6 of the motor is mounted. In this mounting example, the printed wiring board 6 is mounted.
Shows the case where the printed wiring board 6 is fixed to the printed wiring board 6 via the double-sided adhesive tape 7. That is, a state is shown in which a bracket 8 of the same shape is fitted into the rectangular case 1 with an opening, and terminals 9 and 9 projecting in the axial direction from the bracket side 8 are provided in a predetermined pattern 6a of the printed wiring board 6. 6b
Is connected to the power supply.

The one shown in FIG. 3 is applied to an eccentric salient pole type rotor as a vibration motor, in which the lower half of the iron core consisting of six salient poles is cut out and three salient poles 10 are eccentrically arranged on one side. It has been arranged. In this case, since the radial field magnet 2 has thicker corners, a magnetization curve as if a sine curve is obtained and the cogging torque is reduced while increasing the permeance coefficient.

The above is an embodiment applied to a vibration motor having an eccentric rotor, but it goes without saying that it can also be applied to a normal rotary type.

[0011]

As described above, according to the present invention, since the cross section is of the rectangular tube type, the device side can be easily fixed to the printed wiring board by utilizing the rectangular flat surface. Moreover, since the corners are thick, the permeance coefficient becomes large, high efficiency is obtained, and as if a sine curve magnetization curve is obtained,
Cogging torque can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a small DC motor of an eccentric slotless vibration type as one embodiment of the present invention.

FIG. 2 is a perspective view of an example of a mounting structure of the motor.

FIG. 3 is a lateral cross-sectional view of a main part of the other embodiment.

FIG. 4 is a perspective view of a conventional cylindrical small DC motor.

[Explanation of symbols]

1 case 2 field magnet 3 Eccentric slotless iron core 4 axes 5 armature coil 10 salient poles

Continuation of the front page (56) References JP-A-10-23706 (JP, A) JP-A-11-136327 (JP, A) JP-A-8-308170 (JP, A) JP-A-53-72305 (JP , A) JP 2000-228844 (JP, A) Actually open 5-72184 (JP, U) Actually open 55-2251 (JP, U) Actually open 62-125366 (JP, U) Actually open 56 -78681 (JP, U) Actual development Sho 57-159388 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02K 5/22 B06B 1/04 H02K 7/075 H02K 23/66

Claims (4)

(57) [Claims] 1. A cylindrical case (1) which is long in the axial direction,
Radial field magnets magnetized to N and S poles (2)
And placed inside this magnet with a radial gap
In a cylindrical DC motor containing a rotor having an armature coil (5) , the radial field magnet is
The center of the magnetic pole is thick and the end of the magnetic pole is thin on the inner surface of the case.
And have a substantially cylindrical space inside.
And the case is marked on at least part of the outer radial surface.
A flat surface that can be laid down directly on the printed wiring board (6) and fixed.
The opening of this case has the same shape as the plane of the case.
Fit the bracket (8) with a flat surface,
Terminals that can be soldered directly from the bracket to the printed wiring board
(9) has a flat surface on the radial outer surface that is derived only in the axial direction.
Cylindrical DC motor. 2. The case (1) and the bracket (8) are formed such that at least a part of the cross section thereof has a substantially square shape so that the case (1) and the bracket (8) can be placed on the printed wiring board (6), and one side of the square forms the printed wiring line. The diameter according to claim 1, which is laid down directly on a plate and fixed.
Cylindrical DC motor with a flat surface on the outer surface in the direction . 3. The armature coil is provided on an outer peripheral portion of the rotor.
The cylindrical DC motor having a flat outer surface in the radial direction according to claim 1 , wherein the armature coil is wound, and the inside of the armature coil is formed of an eccentric slotless core (3) . 4. In a cylindrical case (1) which is long in the axial direction,
Radial field magnets magnetized to N and S poles (2)
And placed inside this magnet with a radial gap
And a rotor having an armature coil (5)
In the mounting structure of a small DC motor, the radial field type
The magnet has a thick magnetic center on the inner surface of the case.
Make sure that the ends are thin, and that the inner space is almost cylindrical.
And the case has at least one of its outer surfaces.
A flat surface that can be laid down directly on the printed wiring board and fixed
The opening of this case has the same shape as the plane of the case.
Insert the bracket (8) with the formed flat surface,
Axial pin from the bracket can be connected to printed circuit board
Print out the plane of the case and bracket
Use a mounting angle etc. to fix to the wiring board
Be sure that the printed wiring board is not
Soldering the terminals directly to the terminals (6a, 6b)
It has a flat surface on the outer surface in the radial direction, which is designed to be attached to equipment more
A cylindrical DC motor mounting structure.