JPH08275488A - Stepping motor - Google Patents

Abstract

PURPOSE: To electrically connect a motor to a printed board stably and accurately and secure a case body stably and accurately by projecting an outside connection terminal which is formed on a terminal holding section which is integrally formed with a flange of a coil-wound resin-made bobbin and a fixation piece which is formed by cutting up a part of the case body, in the axial direction outside of the body case. CONSTITUTION: Integrally with downside outer parts of flange sections 2A, 2B of resin-made bobbins 1A, 1B around which coils to allow an exciting signal to run in are to be wound, terminal holding sections 3A, 3b are formed. Then, terminals 4A, 4B are secured to the terminal holding sections 3A, 3B and coil terminal connecting sections are bent outward and the other ends are projected downward and thereby outside connection terminals 41A, 41B are formed. In a cover 9B of a case body, a fixation piece 93 is integrally formed with the cover 9B by cutting up a part of the cover 9B. By this method, a stepping motor 10 can be secured on a printed board stably with the fixation piece 93 and can be surely connected electrically by means of the outside terminals 41A, 41B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stepping motor useful as a movement of an indicating instrument.

[0002]

2. Description of the Related Art Conventionally, a moving coil type or a crossing coil type ammeter has been used as a movement of an indicating instrument such as a vehicle speedometer, and further, pulse processing is possible along with digitization of signal processing. Stepping motors are attracting attention.

In particular, the stepping motor is used for various step driving because the PM type can be simplified and downsized as its constitution. It has also come to be used for pointer drive by such reciprocating motion control.

[0004] For example, as an indicating instrument using such a stepping motor as a movement, Jikken 61-
As disclosed in Japanese Patent No. 45490 and Japanese Patent Laid-Open No. 57-56758, a stepping motor has a lateral mounting structure or a laminated structure for driving a pointer with an intermediate gear interposed therebetween. The measured values are indicated by connecting the shafts by mounting the motor.

[0005]

However, in such a stepping motor, the connection to the drive circuit is troublesome because the energizing terminal to the exciting coil is a lead wire, and, for example, Japanese Utility Model Laid-Open No. 5-60150. There is also a structure in which terminals are assembled on a terminal support part integrated with a coil bobbin and can be soldered to a printed board.Even when such a stepping motor is used as a movement of an indicating meter, for example, a printed board is fixed to the meter frame. The stepping motor must be screwed and fixed with a flange that protrudes integrally from the outer case, and not only is the fixing work on the printed board troublesome, but the positional alignment with the terminal soldering to the printed board does not go well, and this soldered part There was a problem that cracks were generated due to the stress at the time of fixing to the.

It is an object of the present invention to provide a stepping motor structure suitable for thinning an indicating instrument, and particularly to obtain a structure having a terminal structure and a structure fixed to a printed board which are excellent in assembling property. To do.

[0007]

The basic structure of the present invention is as follows:
A laminated body of a coil winding resin bobbin for arranging a magnet rotor fixed to a rotating shaft and a comb tooth yoke is housed in a case body, and a terminal holding portion for fixing a terminal for connecting a coil to the flange portion of the bobbin is integrally formed. A fixing piece extending in the terminal projecting direction, which is formed on the terminal and has an external connection end projecting outward from the case body in the axial direction of the bobbin, and which is integrally cut and raised from the case body or the comb tooth yoke. Is provided. Further, a laminated body of a coil winding resin bobbin for arranging a magnet rotor fixed to a rotating shaft and a comb tooth yoke is formed, and a terminal holding portion for fixing a terminal for connecting a coil is integrally formed on a flange portion of the bobbin. It is characterized in that a fixing piece which is formed and integrally cut and raised from the comb tooth yoke and extends in the terminal projecting direction is provided. Further, the terminal holding portion is formed at least at two positions which are substantially symmetrical with respect to the axis of the bobbin.

[0008]

The stepping motor is firmly fixed to the printed board by the fixing piece by soldering or crimping the fixing piece of the stepping motor through the insertion hole of the printed board and connecting the external connection end to the printed board by soldering. , And is stably connected to the printed board at the outer peripheral portions of the plurality of flanges whose axes are symmetrical, and the rotational axis can be stably projected and rotated in the direction orthogonal to the printed board. It is possible to securely and reliably fix the terminals for electrical connection without requiring solder connection strength and without using a dedicated fixing screw.

[0009]

FIG. 1 shows a typical embodiment of a stepping motor according to the present invention. In this embodiment, two bobbins are of a two-phase type and terminal holding portions are formed by dispersing them on each bobbin. Will be described.

In the figure, two laminated resin bobbins 1A and 1B are provided with flange portions 2A and 2B, respectively, so as to wind a coil (not shown) for energizing an excitation signal, and each flange portion 2A is formed. , 2B have terminal holding portions 3A, 3B formed integrally with the lower outer peripheral portion thereof.

Terminals 4A and 4B to which coil ends are connected are fixed to these terminal holding portions 3A and 3B, and these terminals 4A and 4B are fixed by insert molding when molding the resin bobbins 1A and 1B. The coil end connecting portion is bent outward, and the other end projects downward and hangs down to form external connecting ends 41A and 41B.

Each bobbin 1A, 1B has comb tooth yokes 5A, 5B laminated on both sides thereof, and the bent tooth portions are moved so as to face the hollow portions 6A, 6B of the bobbins 1A, 1B and the tooth portions of the respective yokes are moved. The phases are staggered, and the hollow portion 6A,
A magnet rotor 8 fixed to the rotary shaft 7 is disposed in the hollow portion through which 6B is passed so that the comb teeth of the yokes 5A and 5B and their magnetic poles face each other.

These component elements are housed and fixed in a case body 9 in a laminated mounting state. The case body 9 comprises a metal storage case portion 9A and a lid portion 9B, and a bearing portion 91B of the lid portion 9B. The lower end of the rotary shaft 7 is received by, and the upper side of the rotary shaft 7 is received by the bearing 91A of the storage case 9A, and the tip of the shaft is projected outside the case.

Further, the storage case portion 9A and the lid portion 9B of the case body 9 have flange portions 2A, 2 of the bobbins 1A, 1B.
Openings 92A and 92B for arranging the terminal holding portions 3A and 3B integrally formed with B so that the terminals 4A and 4B, particularly the external connection ends 41A and 41B, are led out are formed in the storage case portion 9A. The assembly of the component elements is housed and the lid 9B is joined by welding, caulking or the like to complete the stepping motor.

At this time, a fixed piece 93 which is cut and raised integrally with the lid portion 9B is formed, and the fixed piece 93 is bent and formed so as to extend in the extending direction of the external connection end 41.

The stepping motor 10 completed as described above
2 has an external configuration as shown in FIG. 2, in which the rotary shaft 7 projects as a rotary output shaft on the upper side of the case body 9, and the terminals 4A and 4B are arranged along the axial direction on the side opposite to the axial output direction.
The external connection terminals 41A, 41B and the fixing piece 93 of the case body 9 are
It further extends from the lower surface and is drooped.

Therefore, when the stepping motor 10 is connected to a printed board on which a drive circuit for the stepping motor 10 is mounted and the pointer and the like are driven by the rotary shaft 7, the fixing piece 93 is inserted through the printed board. Insert the external connection terminal 41A through the hole,
The stepping motor 10 is placed on the printed board so that the 41B is inserted into the electric circuit hole of the printed board, and the fixing piece 93
To secure the stepping motor 10 stably and planarly and securely on the printed board by crimping on the back surface of the printed board and by soldering the external connection terminals 41A and 41B which are substantially symmetrical to the axis. In addition, it is possible to prevent stress on the soldered portions of the external connection ends 41A and 41B, and ensure stable and stable electrical connection.

The stepping motor 10 thus configured
Is suitable for mounting as a movement of the indicating instrument 11 as shown in FIG. That is, stepping motor
The indicator instrument 11 in which 10 is assembled as a movement has a boss portion 13A integrated with a light guide plate 13 on which a dial plate 12 is placed and which illuminates a display portion such as a transparent scale and letters. The printed board 14 having the stepping motor 10 fixedly connected to the boss portion 13A is fixed by screws 15.

In this case as well, the stepping motor 10 is fixed in a stable horizontal state by inserting and fastening the fixing piece 93 into the insertion hole of the printed board 14, so that the stepping motor 10 is securely fixed to the printed board in advance and electrically. It can be attached to the instrument 11 in a connected form.

In this case, the rotary shaft 7 has the external connection ends 41A, 41
The pointer 16 is fixed to the tip above the dial 12 so that it is projected in the direction opposite to the direction in which B is derived, and the direction in which the rotary shaft 7 of the stepping motor 10 projects is defined by the external connection ends 41A and 41B. The directions may be the same.

That is, as shown in FIG. 4, the transmissive dial 12 and the printed board 14 are fixed by a spacer 17 with a fixed space therebetween, and the stepping motor 10 is attached from the opposite side of the printed board 14. Instrument as if fixed
13 can also be configured.

The structure of the stepping motor 10 in this case is such that the rotary shaft 7 is projected from the lid portion 9B side where the fixed piece 93 is formed, and the fixed piece 93 is inserted into the dummy electrode hole of the printed board 16. It is fixed by soldering, and it can be fixed in the same way as caulking and can be fixed by soldering work. By connecting the light emitting diode 18 to the position, it becomes possible to illuminate the display section through
The indicating instrument 13 can be made extremely thin.

In the embodiment described above, the case body 9 is used.
The fixing piece 93 is formed integrally with the above, but when the metal comb yoke 5B that can be crimped or soldered and fixed to the printed board is molded, the fixing piece is formed integrally with the yoke 5B. It can be bent and raised, and the fixing piece can also function as a fixing piece to the printed board by projecting from the case body 9 through the opening.

Further, as shown in FIG. 5, the stepping motor 10 is formed by forming the comb-shaped yokes 5A and 5B in the shape of an outer cover without stacking the case body 9 and fixing them in layers.
Also in the case of configuring, by forming the fixing piece 51 which is cut and raised integrally with the comb tooth yoke 5B, it is possible to similarly secure the fixing by crimping or soldering with the printed board, which is thin as a movement of the indicating instrument. It is extremely effective in terms of improvement and simplification of assembly.

[0025]

As described above, according to the stepping motor structure of the present invention, the stepping motor can be easily fixed to the printed board by the fixing piece, and at the same time, the terminal can be reliably soldered to the printed board. By the attachment connection, the stepping motor can be stably connected and fixed, the workability at the time of assembling as a movement of the indicating instrument is improved, and the assembling configuration in which the indicating instrument is extremely thin becomes possible. In particular, if the stepping motor itself becomes thin, the thickness of the indicating instrument can be made extremely thin accordingly, and a stepping motor that is extremely effective as a movement for assembling in the instrument unit incorporating the drive circuit can be used. It can be provided.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a stepping motor according to the present invention.

FIG. 2 is an assembly external view of the stepping motor shown in FIG.

FIG. 3 is an external view as an indicating instrument when connected and fixed to a printed board.

FIG. 4 is an external view of an instrument showing another example connected and fixed to a printed board.

FIG. 5 is a sectional view of a stepping motor showing another embodiment of the present invention.

[Explanation of symbols]

 1A, 1B Bobbin 2A, 2B Flange part 3A, 3B Terminal holding part 4A, 4B Terminal 41A, 41B External connection end 5A, 5B Comb tooth yoke 6A, 6B Hollow part 7 Rotating shaft 8 Magnet rotor 9 Case body 9A Storage case part 9B Lid 51, 93 Fixed piece 10 Stepping motor 11 Indicator 12 Dial 14 Printed board

Claims (4)

[Claims] 1. A resin bobbin around which a coil is wound, a magnet rotor fixed to a rotary shaft extending along the axis of the bobbin and rotatably disposed in a hollow portion of the bobbin.
A terminal for fixing a terminal for connecting the coil to a flange portion of the bobbin, which is composed of a comb tooth yoke that is laminated on the bobbin and applies the coil magnetic field to the magnet rotor, and a metal case body that houses these. The holding portion is integrally formed, and the terminal has an external connection end extending in the axial direction of the bobbin and protruding at least from the case body to the outside in the axial direction. Further, the terminal is integrally formed from the case body or the comb tooth yoke. A stepping motor comprising a cut and raised fixing piece extending in the terminal protruding direction. 2. A resin bobbin around which a coil is wound, a magnet rotor fixed to a rotary shaft extending along the axis of the bobbin and rotatably disposed in the hollow portion of the bobbin.
It is composed of a comb tooth yoke that is laminated on the bobbin and applies the coil magnetic field to the magnet rotor, and the flange of the bobbin is integrally formed with a terminal holding portion for fixing a terminal that connects the coil, and the terminal. Has an external connection end extending in the axial direction of the bobbin and protruding downward from at least the lower surface of the comb tooth yoke, and further provided with a fixing piece integrally cut and raised from the comb tooth yoke and extending in the terminal protruding direction. A stepping motor characterized in that 3. The stepping motor according to claim 1 or 2, wherein the terminal holding portion is formed at at least two positions that are substantially symmetrical with respect to the axis of the bobbin. 4. The stepping motor according to claim 1, wherein the printed board is arranged on the protruding side of the terminal and the fixed piece, and the fixed piece is inserted into the insertion hole of the printed board and caulked or A stepping motor that is fixed by soldering.