JPH0279741A - Stator for small electric motor - Google Patents

Abstract

PURPOSE:To facilitate winding work, to stabilize quality and to reduce cost by winding a stator coil on a bobbin and a coil terminal under the state in which the coil terminal is not bent, bending the coil terminal and engaging the coil terminal with the engaging section of the bobbin. CONSTITUTION:The inserting section 12a of a coil terminal 12 is press-fitted into an inserting groove 10a, and a slip-off stop 12b is fastened to an engaging hole 10b. The terminal of a coil 9 is wound on the coil connecting section 12c of the coil terminal 12 under the state while the stator coil 9 is wound on a bobbin 10. The coil terminal 12 is bent by a bending section 12d, and an inserting holding section 12e is fitted into a recessed section 10c for retaining. An external connecting section 12f is bent, and connected to an external connecting terminal 13. Accordingly, the stator coil 9 is wound on the bobbin 10 and the coil terminal 12 under the state in which the coil terminal 12 is not bent, and the coil terminal 12 is turned up and engaged with the bobbin 10, thus realizing the facilitation of winding work and the stabilization of quality.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a stator for a small electric motor.

[Conventional technology]

In conventional stators for small electric motors, one end of the coil terminal that connects the ends of the coil is attached to the bobbin around which the coil is wound, and one end of the coil terminal is attached to the bobbin around which the coil is wound. It was bent across the outer circumference of the coil for easy connection.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional stator for a small electric motor, the coil terminals cross the outer circumference of the coil, so the coil cannot be wound around the bobbin by an automatic winding machine. It was not possible to automatically wrap the coil terminal around the coil terminal, making it impossible to stabilize quality and reduce costs.Also, there was a risk that the distance between the coil terminal and the coil would shift due to deformation of the coil terminal. This caused an external force to be applied to the coil, which could cause the coil to break.Furthermore, the attachment of the coil terminal to the bobbin became loose, making the winding work unstable.

This invention was made to solve the above-mentioned problems, and it is possible to perform winding work easily and stably, to stabilize quality and reduce costs, and to prevent disconnection of coils. The purpose of the present invention is to obtain a stator for a small electric motor that can prevent the above.

[Means to solve the problem]

A stator for a small electric motor according to the present invention includes a bobbin having a coil terminal insertion groove in one collar part and a coil terminal locking part in the other collar part, and one end having a plurality of protrusions formed therein. The coil terminal is press-fitted into the insertion groove by the protrusion, bent and locked in the locking part, and has an external connection terminal connected to the other end, and the coil terminal is wound around the bobbin in an unbent state. The stator coil is rotated and connected between a bent portion and a locking portion of a coil terminal.

[For production]

The stator coil in this invention is wound around the bobbin and the coil terminal in a state where the coil terminal is not bent. Further, the coil terminal is bent and locked in the locking portion of the bobbin. Furthermore, the coil terminal is inserted into the insertion groove of the bobbin via the protrusion.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. 1st
In the figures and FIG. 2, 1 is a housing, 2 is a cover made of an insulator, etc., and the cover 2 is attached to the rear edge of the housing l via a banking 3. A rotor shaft 4 is an output shaft, and is rotatably supported on the inner peripheral surface of the housing 1 and the inner peripheral surface of the cover 2 via bearings 5a and 5b. A multi-pole magnetized magnet 6 is disposed on the outer periphery of the central portion of the rotor shaft 4, and the magnet 6 is coaxially fixed to the rotor shaft 4 via a mold 7. Further, in order to prevent backlash in the thrust direction of the rotor shaft 4, a spring 8 is provided between the inner surface of the cover 2 and the bearing 5b. A bobbin 10 is disposed on the outer periphery of the magnet 6 at intervals, and a stator coil 9 is attached to the bobbin 10.
Wrap it around. The coil 9 generates magnetic force when energized. 1
A stator core 1 is formed to cover the bobbin IO, guides the magnetic force of the coil 9, and is provided facing the magnetic pole of the magnet 6. 12 is a coil terminal to which the terminal of the coil 9 is connected.

Further, reference numeral 2a denotes an outer peripheral guide formed in a circular arc shape to protrude from the cover 2, and holds the coil 9, bobbin 10, and stator core 11 concentrically with the rotor shaft 4.

Guide grooves 2b are formed in the axial direction on the inner periphery of the outer circumferential guide 2a, and are for arranging the magnetic poles of the stator core 11 at equal pitches, and the protrusions 11a of the stator core 11 fit into the guide grooves 2b. Further, 2c is an opening formed in the upper part of the outer circumferential guide 2a, and the coil terminal 12 projects outside the outer circumferential guide 2a through the opening 2c and is connected to an external connection terminal 13. A mold 14 protects the coil 9 and the coil terminal 12.

When assembling, the bearing 5a is attached to the rotor shaft 4.

5b, and also integrate the bobbin 10, coil 9 and coil terminal 12 on the stator side with a mold 14, and assemble the stator core 11 to this integrated structure.
Next, the backing 3 and the stator side parts are sequentially assembled to the cover 2. At this time, the outer circumferential guide 2a, the guide groove 2b, and the protrusion 11a serve as positioning guides, and the coil terminal 12 is inserted into the external connection terminal 1 from the opening 2c.
3, and the coil terminal 12 and external connection terminal 13 are soldered. The electric motor is completed by stacking the spring 8, rotor shaft 4, and housing l in this order on the cover 2 assembled in this state.

On the other hand, FIGS. 5(a) and 5(b) show a plan view and a sectional view of the coil terminal 12, in which the coil terminal 12 includes an insertion portion 12a and a pull-out stopper 12 protruding from the insertion portion 12a.
b, coil connecting portion 12c formed by bending, bending portion 1
2d, the insertion holding part 12e, the external connection part 12f, and the protrusion part 1 protruding from the insertion part 12a to the same side as the retainer 12b.
Consisting of 2g.

Further, as shown in FIG. 6, the bobbin 10 has a cylindrical portion with flanges 10d and 10e at both ends, and an insertion groove 10a is formed in one of the flanges 10d. A locking hole 10b is provided, and a locking recess 10c is formed in the other flange foe. !
When setting up the coil terminal 12, first insert the insertion portion 12a of the coil terminal 12 into the insertion groove 108, as shown in FIG.
g, and the stopper 12b is locked in the locking hole 10b by a spring action. In this state, the automatic winding machine winds the end of the coil 9 around the coil connection part 12c of the coil terminal 12, and also winds the coil 9 onto the bobbin lO.
Wind it around. Thereafter, as shown in FIGS. 3 and 4, the coil terminal 12 is bent at the bending portion 12d, and the insertion and holding portion 12e is fitted into the locking recess 10c.

After that, as described above, bend the external connection part 12f,
Connect with external connection terminal 13. Coil connection part 12
c and the terminal of coil 9 are soldered.

In the above embodiment, the coil 9 is wound around the bobbin 10 and its terminal is wound around the coil terminal 12 while the coil terminal 12 is in a straight state, thereby facilitating the winding work using an automatic winding machine. be able to. Further, since the coil terminal 12 is locked in the locking recess 10c of the bobbin IO, the coil connecting portion 12c does not move, and the end of the coil 9 is prevented from being disconnected. Furthermore, the coil terminal 12 is inserted into the insertion groove 10 through the protrusion 12g.
Since the coil 9 is press-fitted into the coil connecting portion 12c, there is no play, and the coil 9 can be stably connected to the coil connecting portion 12c.

Moreover, since point contact press-fitting is achieved using the plurality of protrusions 12g, the insertion force can be reduced compared to a case where full contact press-fitting is achieved by increasing the thickness or width of the insertion part 12a. Deformation of the terminal 12 is also less likely to occur.

FIG. 7 shows a second embodiment of the present invention, in which the protruding portion 12g of the coil terminal 12 is made to protrude in the width direction of the insertion portion 12a, and the operation and effect are the same as in the first embodiment. be.

〔Effect of the invention〕

As described above, according to the present invention, the stator coil is wound around the bobbin and the coil terminal in a state where the coil terminal is not bent, and the winding work can be performed automatically without being hindered by the coil terminal. , it is possible to stabilize the quality of the coil and reduce costs. Further, since the coil terminal is bent and locked in the locking part of the bobbin, the distance between the coil connecting part of the coil terminal and the coil is always maintained constant, and disconnection of the coil due to external force can be prevented.

Furthermore, the coil terminal is press-fitted into the insertion groove of the bobbin, so there is no play, and the work of connecting the coil to the coil terminal can be performed stably.

[Brief explanation of the drawing]

1 and 2 are a longitudinal sectional front view and a sectional view taken along the line A-A of a small electric motor according to the invention, and FIGS. 3 and 4 are longitudinal sectional views of a stator for a small electric motor (excluding the stator core) according to the invention. A front view and a side view, FIGS. 5(a) and 5(b) are a plan view and a sectional view of a coil terminal according to the present invention,
FIG. 6 is a sectional view of the coil terminal according to the present invention attached to a bobbin. FIG. 7 is a sectional view of a structure for attaching a coil terminal to a bobbin according to a second embodiment of the present invention. 4... Rotor shaft, 6... Magnet, 9... Stator coil, 10... Bobbin, IQa... Insertion groove,
10b... Locking hole, 10 c-... Locking recess, 10
d, 10e...Brim portion, 11...Stator core, 1
2.--Coil terminal, 12a...Insertion part, 12
b...Removal stopper 612c...Coil connection part, 12d
...Bending part, 12e...Insertion holding part, 12f.
...External connection part, 12g...Protrusion part, 13...External connection terminal. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] In a small electric motor equipped with a rotor having a permanent magnet and a stator disposed on the outer periphery of the rotor and having a stator coil, collars are formed at both ends of the cylindrical part, and one collar has an insertion groove for a coil terminal. At the same time, the bobbin has a coil terminal locking part on the other collar part, and one end, which is linear and has a plurality of protrusions formed therein, is press-fitted into the insertion groove by the protrusions, and is bent to fit into the locking part. A coil terminal that is locked and has an external connection terminal connected to the other end, and the coil terminal is wound around a bobbin in an unbent state and the end is connected between the bent part of the coil terminal and the above-mentioned locking part. A stator for a small electric motor, characterized by being equipped with a stator coil.