JP2571672Y2 - Stepping motor coil bobbin - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil bobbin for a stepping motor.

[0002]

2. Description of the Related Art Generally, a stepping motor has a cylindrical magnet integrally fixed to a shaft, and has a multi-pole magnetized rotor on the outer peripheral surface of the magnet. A stator is arranged around the rotor so as to face the rotor. In the stator, an enamel wire having an extremely small wire diameter is wound a plurality of times around a coil bobbin made of synthetic resin in which flanges are integrally formed at both ends of an annular body portion, and teeth corresponding to the number of steps of the rotor are provided. The outer and inner stators sandwich the coil bobbin from both sides in the axial direction, and are arranged vertically in two stages.

As described above, the upper and lower stators including the shaft, the magnet, the coil bobbin, and the inner and outer stators are housed in the metal housing, the opening of the housing is closed by the cover, and the bearing arranged in the housing and the cover is used. The shaft of the rotor is rotatably supported.

In order to rotate the above-described stepping motor, it is necessary to supply a current by electrically connecting a winding terminal of the exciting coil to an external power supply. For this reason, a terminal portion is formed integrally with the coil bobbin around one of the flange portions of the coil bobbin, and a plurality of terminal pins for connecting to an external power supply are attached to the terminal portion. Winding terminal is soldered to this terminal pin
Connected.

[0005]

However, since the enamel wire as the exciting coil wound around the coil bobbin is extremely thin, the winding terminals of the exciting coil are connected to a plurality of terminal pins by soldering or the like. In this case, the heat of the soldering iron is accumulated in the terminal portion, which may cause a problem such as deformation of the terminal portion around the terminal pin or disconnection of the wire.

In addition, when connecting to a terminal pin,
In order to dissipate heat, corrugated uneven strips are formed on the terminal pins themselves.
The formation can be performed, for example, in Japanese Utility Model Laid-Open No. 53-136178.
Is known for. However, the terminal pin itself has a wavy shape
When connecting to multiple terminal pins,
In the case, these corrugated uneven lines are applied to each terminal pin.
It had to be formed and the number of manufacturing steps was increasing. Moreover,
In general, extremely thin members such as terminal pins
Not only is it necessary to form ridges, making manufacturing difficult, but also
There is a drawback that a large heat dissipation effect cannot be expected due to
Was.

In the present invention, when connecting the excitation coil winding terminal of the stepping motor and a plurality of terminal pins as described above, deformation of the peripheral portions of the terminal pins due to the heat of the soldering iron and disconnection of the windings have a simple structure. an object and this <br/> be more effectively prevented.

[0008]

Means for Solving the Problems To solve the above problems, the present invention provides a coil bobbin of a stepping motor in which an exciting coil is wound, and a resin bobbin main body having flange portions formed at both ends of an annular body portion. And the bobbin
Formed integrally protruding from one flange of the body
And a connecting terminal portion made of resin.
Are a plurality of ends to which the excitation coil is connected by soldering.
A terminal portion for holding a child pin, and the terminal portion and the flange portion
And a connecting portion that connects the
Characterized by having a heat dissipating part with increased contact surface area
Is what you do. In a second aspect, the heat radiating section is
It is characterized in that a plurality of holes are formed in predetermined portions of the connecting portion.

[0009]

The coil bobbin of the stepping motor having the above-mentioned structure is located at one end from the periphery of one flange portion of the resin bobbin main body.
The connection terminal part made of resin is formed to protrude physically,
A plurality of terminal pins are held by the terminal portion of the connecting terminal portion, and
Attachment surface to the air at the connecting part that connects the child part and the flange part
A radiator for increasing the product is provided . Thus, multiple
The heat radiation part is formed in the connection part common to the terminal pins of
Connect the excitation coil to multiple terminal pins by soldering.
Heat can be dissipated with a simple configuration regardless of the number of terminal pins.
Can be closed. In addition, multiple terminal pins
With a relatively large space for holding the terminal part
To connect to the flange part and release heat at the connection part
Because the part was formed, a large contact area with the atmosphere was obtained,
A relatively large heat radiation effect can be obtained. Further, since the heat radiating portion is formed only by forming a plurality of holes at a predetermined portion of the connecting portion, the heat radiating portion can be configured without adding any special parts.

[0010]

As described above, the coil bobbin of the stepping motor of the present invention has a plurality of terminal pins and an exciting coil winding.
When connecting to the terminal when connecting to the terminal
Simple structure makes it easier for the heat of the body to accumulate
Suppress to prevent disconnection of excitation coil and deformation of connecting terminal
can do.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 4 show a first embodiment of a stepping motor coil bobbin according to the present invention. FIG. 1 is an overall sectional view of the stepping motor, and FIG. 2 is a partially cutaway perspective view of the coil bobbin of the first embodiment. 3 is a cross-sectional view around the connection terminal portion , and FIG. 4 is a perspective view showing the inner stator or the outer stator.

A cylindrical rotor magnet 2 made of a plastic magnet material is fixed to the shaft 1 by integral molding, and the outer peripheral surface of the rotor magnet 2 is multipolar magnetized.

Meanwhile, the coil bobbin 8 and 9 will be described in detail later, the flange portions 26 at both ends of each of a synthetic resin annular body portion 22 is formed integrally, moreover co
A part of the flange portion on the side of the ilbobin 8 includes a connecting terminal portion 4.
0 and terminals via the connecting portion 20.
The part 14 is formed integrally. This synthetic resin
An enamel wire having an extremely small wire diameter is wound a plurality of times around the formed coil bobbins 8 and 9 . Further, outer stators 10, 13 having teeth 30 corresponding to the number of steps of the rotor magnet 2 and inner stators 11, 12 sandwich the coil bobbins 8, 9 from both sides in the axial direction, respectively, and are arranged vertically in two stages. Is done. At this time, the teeth 30 are arranged on the inner periphery of the body portion 22 of the coil bobbins 8 and 9 so as to face the rotor magnet 2.

The upper and lower stators comprising the shaft 1, the rotor magnet 2, the coil bobbins 8, 9 and the inner and outer stators 10 to 13 are housed in a housing 3 made of synthetic resin.
The opening 3 of the housing 3 is closed by a cover 4, and the housing 3 and the cover 4 have a bearing 5.
And the shaft 1 is rotatably supported. At this time, the gap between the inner peripheral surface of the housing 3 and the coil bobbins 8 and 9 is molded with a resin 16 containing a magnetic material such as iron powder to form a magnetic circuit of the inner and outer stators 10 to 13.

In order to electrically connect the winding terminals of the coils 6 and 7 of the stepping motor constructed as described above to an external power supply, one flange 26 of the coil bobbin 8 made of synthetic resin is integrally formed from the periphery. The connecting portion 20 of the connecting terminal portion 40 formed so as to protrude is formed.
The terminal portion 14 of the connection terminal portion 40 is integrally formed with the connecting terminal portion 40 . A plurality of terminal pins 15 to be connected to an external power supply are attached to the terminal portion 24 in the terminal holes 24, and the winding terminals of the coils 6 and 7 are connected to the terminal pins 15 by soldering with solder 25. You.

When soldering to the three terminal pins 15 assembled to the terminal portion 14, respectively, the connection portions, that is, the terminal pins 15, the winding ends of the coils 6, 7, the terminal portion 14, and the connecting portion 20, are soldered to the soldering iron. heat will accumulate in it, if
Integral with the flange 26 of the coil bobbin 8 using synthetic resin
A plurality of radiating holes 21 are formed in the connecting portion 20 of the connecting terminal portion 40 which is connected , and the radiating holes 21 increase the contact surface area with the air, and positively generate heat to the air. At least, the accumulation of heat can be suppressed.

In the above embodiment, a plurality of heat radiating holes 21 are formed in the connecting portion 20 as heat radiating portions. However, the present invention is not limited to this. May be formed. FIG.
Medium 17 is how to maintain the connection with the external power supply.
A guide portion provided at a predetermined position of the jing 3;
The pin 15 is led out of the housing .

[Brief description of the drawings]

FIG. 1 is an overall sectional view of a stepping motor using one embodiment of a coil bobbin of the stepping motor of the present invention.

FIG. 2 is a partially cutaway perspective view of the coil bobbin of the first embodiment.

FIG. 3 around the connection terminal of the coil bobbin of the first embodiment.
Rino is a cross-sectional view.

FIG. 4 is a perspective view showing an inner stator or an outer stator of the first embodiment.

[Explanation of symbols]

6, 7 Coil 8, 9 Coil bobbin 14 Terminal part 15 Terminal pin 17 Guide part 20 Connection part 21 Heat dissipation hole 22 Body part 26 Flange part 40 Connection terminal part

Claims (2)

(57) [Scope of request for utility model registration] 1. A coil bobbin of a stepping motor in which an exciting coil is wound, wherein a resin bobbin main body having flange portions formed at both ends of an annular body portion, and one flange portion peripheral edge of the bobbin main body are integrally formed. Protruding
And a resin-made connecting terminal portion formed by projecting, and the connecting terminal portion is connected to the exciting coil by soldering.
A plurality of terminal pins for holding a plurality of terminal pins,
A connecting portion connecting the flange portion and the connecting portion;
With a heat radiating part that has increased the contact surface area with the atmosphere
Coil bobbin for a stepping motor
N. 2. The coil bobbin for a stepping motor according to claim 1, wherein the heat radiating portion is formed by forming a plurality of holes in a predetermined portion of the connecting portion.