JPH0218697Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a stepping motor, and relates to a structure for connecting a coil wound around a stator core and a lead wire.

(Prior art) In a conventional stepping motor of this type, the connection between the coil wound around the stator core and the lead wire is as follows.
A structure is adopted in which the drawn-out end of each coil is wrapped around a lead wire and soldered, and the connecting portion between the coil and the lead wire is covered with an insulating tube.

(Problems to be solved by the invention) In the stepping motor with the conventional structure described above, in the 8-slot bipolar drive system, each of the 8 lead wires must be connected to a coil and the insulation tube must be covered. In addition, it is necessary to tie this lead wire to the coil or winding frame for each coil with thread, etc. When tying the coil, the wire of the coil is thin and easy to cut, resulting in a large number of defective products and a low yield. Workability is poor, manufacturing costs are high, and if a gap is formed between the coil and the winding frame to tie the lead wire to the coil,
There are problems such as the overall size becomes larger.

Therefore, a structure can be considered in which the circuit board that connects the coil and the lead wire is placed on the coil winding frame and tied with thread etc., but if the circuit board is a simple square shape, the coil connection workability is poor. have.

This invention was developed in view of the above problems, and allows easy connection between each coil wound around the stator core and the lead wire using a circuit board, improving yield and improving work efficiency. To provide a stepping motor that can be manufactured at low cost.

[Structure of the idea]

(Means for Solving the Problems) The stepping motor of the present invention includes a frame-shaped stator core having a plurality of protruding poles each having a plurality of salient poles corresponding to the step angle, and a A winding frame fitted with each pole and wound with a coil,
A circuit board that connects the coil wound around the winding frame with the lead wire and is held at the top of the winding frame, and a step that is arranged in the space of the stator core and corresponds to the salient pole of each pole. and a rotor having salient poles formed on the circumferential surface according to the corners, the circuit board is formed in an annular shape, and a plurality of protrusions are formed protruding outwardly at intervals on the outer periphery of the circuit board. An engaging recess for holding each protrusion of the circuit board is formed in the upper part of the winding frame, and the coil is connected to the protrusion of the circuit board.

(Function) When assembling the stepping motor of the present invention, the end of each coil and the lead wire can be connected to the protrusion of the circuit board. In particular, when connecting the coils, the end of the coil can be connected to the protrusion. It can also be wound, so there is no risk of cutting the thin coil wire, and the end of each coil can be easily connected to the lead wire. Further, the circuit board is reliably held on the upper part of the winding frame by engaging the protrusions in the respective engagement recesses on the outer periphery of the winding frame.

(Embodiment) The structure of an embodiment of the present invention will be explained with reference to FIGS. 1 to 4.

Reference numeral 1 denotes a stator core, which is formed by laminating core pieces into a frame shape with a substantially square outer periphery and a substantially octagonal inner periphery. A pole 2 is protruded from approximately the center of each edge of the inner periphery of the iron core 1, and a plurality of salient poles 3 are formed on the tip surface of each pole 2 to protrude inward in an uneven manner according to the step angle. ing.

Next, reference numeral 4 denotes an annular winding frame, which is made of an elastic insulating material such as synthetic resin, and is divided into parts so as to be fitted from both sides of the stator core 1. A projecting wall 6 is integrally provided along each corner of each edge of the inner circumference of the iron core 1 to form a substantially V-shaped engagement recess 5 projecting outward from both end faces. Moreover, this winding frame 4 is connected to each pole 2.
Flanges 7 and 8 are provided at both ends of each pole 2 to cover the periphery of the pole.
is formed.

Further, 9 is a coil, which is bifilar-wound around each pole 2.

Next, reference numeral 10 denotes a rotor, which is disposed in the inner space of the iron core 1, and this rotor 10 includes a disk-shaped permanent magnet 11 and disk-shaped magnetic bodies 12, 12 provided on both sides of the permanent magnet 11. A salient pole is formed on the outer circumferential surface of the magnetic bodies 12, 12, the outer surface of which is uneven in accordance with the step angle. A rotating shaft 13 is fixed through the center of the rotor 10, and bearings 14 are attached to both ends of the rotating shaft 13.
14 is fixed.

Next, reference numeral 15 denotes a circuit board, which is formed in a substantially annular shape and has an inner diameter that is substantially smaller than the diameter of the inner flange 8 of the winding frame 4. A plurality of protrusions 1 engaged with the engagement recess 5
6 is formed to protrude outward. The tip edge of each protrusion 16 is formed into a substantially triangular shape, and each protrusion 16 has a wiring pattern 17 formed thereon. The circuit board 15 engages the protrusions 16 in the respective engagement recesses 5 on the outer circumference of the winding frame 4, and also fits the inner flange 8 on the inner peripheral edge by utilizing the elasticity of the material of the winding frame 4. As a result, the circuit board 15 is held on top of the winding frame 4. In addition, the ends of each of the coils 9 are wound around each of the projections 16.
The lead wire 18 and the end of the coil 9 are connected to the wiring pattern 17 by soldering.

Furthermore, a holding protrusion 1 is provided on the outer periphery of the circuit board 15.
When bundling a plurality of lead wires 18 connected to the wiring pattern 17 of the circuit board 15, the lead wires 18 are hooked and engaged with the holding projections 19. Prevent contact with the rotor 10.

Furthermore, casings 20, 20 are fitted to both ends of the stator core 1, and are fixed integrally with the stator core 1 by tightening screws 21.

Next, a method of assembling this embodiment will be explained.

Fit the winding frame 4 split in half from both ends of the stator core 1, and attach the coil 9 to the winding frame 4 corresponding to each pole 2 part.
are respectively wound, and the projection 16 of the circuit board 15 is engaged with the engagement recess 5 of the winding frame 4, and the inner peripheral edge of the circuit board 15 is elastically fitted into the inner flange 8 of the winding frame 4. , the end of each coil 9 is wound around each protrusion 16, and the end of each coil 9 and each lead wire 1 are connected to each other.
8 are connected to each wiring pattern 17 by soldering, and when each lead wire 18 is gathered in one place, the lead wire is hooked and engaged with the holding protrusion 19 of the circuit board 15 and led out.

Next, the rotor 10 is inserted into the stator core 1,
Casings 20, 20 are fitted to the stator core 1, bearings 14, 14 that rotatably support the rotating shaft 13 of the rotor 10 are held in the casings 20, 20, and the casings 20, 20 and the stator core 1 with screws 21.

Next, the operation of this embodiment will be explained.

When both phases of each coil 9 are alternately excited and each coil 9 is sequentially excited, the rotor 10 is sequentially rotated by a step angle.

Further, during assembly, since the end of each coil 9 is wound around the protrusion 16 of the circuit board 15 and held by the winding frame 4, the end of the coil 9 and the lead wire 18 are
It is easy to connect with.

Since each lead wire 18 is bundled and engaged with the holding protrusion 19 of the circuit board 15, the lead wire 18 does not come into contact with the rotor 10, thereby preventing the occurrence of defects and accidents.

Next, the structure of another embodiment will be explained with reference to FIGS. 4 and 5.

A split pin 22 connected to the end of the coil 9 is connected to the wiring pattern 17 and implanted in each protrusion 16 of the circuit board 15.

In this structure, the lead end of the coil 9 is sandwiched between the split pins 22, and then the lead wire 18
is soldered to the split pin 22.

Further, the configuration of other embodiments shown in FIGS. 7 and 8 will be explained.

A pin 23 provided between each coil 9 on the circuit board 15 is formed into a cylindrical shape, a retaining elastic piece 24 is formed on the outside of this pin 23, and the end of the coil 9 is attached to the upper end of this pin 23. A connecting groove 25 is formed, and a locking piece 27 is protruded from the pin 23 to prevent the lead wire 18 inserted from below the pin 23 from coming off.

With this structure, the lead wire 18 and the drawn-out end of the coil 9 can be connected to the pin 23 by solder blowing.

Furthermore, the configuration of another embodiment shown in FIG. 9 will be explained.

A protrusion 26 for holding the protrusion 16 of the circuit board 15 is formed in the engagement recess 5 of the projecting wall 6 of the winding frame 4.

With this structure, the engagement of the circuit board 15 can be reliably maintained, and lifting of the circuit board 15 and breakdown voltage failure due to vibrations can be prevented.

Further, as shown in FIG. 10, the inner periphery of the circuit board 15 is formed into a substantially elliptical shape, and the inner periphery of the circuit board 15 is formed into a winding frame 4.
It elastically fits into the inner flange part 8 of.

In this structure, the diameter of the inner flange 8 of the winding frame 4, the diameter of the wiring pattern 17 of the circuit board 15, and the diameter of the wiring pattern 17 of the circuit board 15 are
It is also possible to reduce the size of the substrate 15 by reducing the difference in the inner diameters of the substrates 15 and 15.

Furthermore, the end of the coil 9 and the lead wire 18 may be connected to the wiring pattern 17 of the circuit board 15 by separate solders.

Further, the positioning of the circuit board 15 can be facilitated by forming a protrusion on the winding frame 4 that engages with an engagement hole in which the circuit board 15 is formed.

Further, the projecting wall 6 of the winding frame 4 is deformed to form the circuit board 15.
Alternatively, a protrusion formed on the circuit board 15 may be modified and fixed to the winding frame 4.

In addition, by arranging the lead wire 18 on the stator core 1 side of the circuit board 15, leading out the connecting end of the lead wire 18 to the outer surface of the circuit board 15, and connecting the end of the coil 9 near it, , the coil 9 and the lead wire 18 can be connected at the same time.

Furthermore, by using ribbon electric wires for the lead wires 18, the work of connecting each lead wire 18 to a connector, etc. can be easily performed.

[Effect of idea]

According to the present invention, on the outer periphery of the annular circuit board attached to the upper part of the winding frame of the coil attached to the stator core, a protrusion for connecting the lead wire is formed facing outward, and the protrusion is attached to the protrusion. Since the coils and lead wires are connected easily, there is no occurrence of defects such as disconnection of the coils, and the yield is good. By attaching the ends of the coils to the circuit board, it is possible to assemble the stator core It is easy to handle, and since the circuit board is fixed to the winding frame, the work of connecting the coil ends and lead wires is improved, and the work of connecting the coil ends and lead wires is simplified, making transportation and packaging easier. Accidents are also reduced, and the overall structure can be assembled into a smaller size. Further, by engaging and holding the protruding portion of the circuit board in the engaging recess of the winding frame, the mounting of the circuit board is ensured, and lifting of the circuit board due to vibration or the like is prevented.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway front view of a stepping motor showing an embodiment of the present invention, Figure 2 is a perspective view of a portion of the same, and Figure 3 is a plan view of the same with the upper casing removed. , Fig. 4 is a plan view of the same circuit board as above, Fig. 5 is a plan view of a circuit board showing another embodiment, Fig. 6 is a front view of the same pin as above, and Fig. 7 is a circuit board showing another embodiment. 8 is a sectional view of the same as above, FIG. 9 is a perspective view of the engaging portion between the circuit board and the winding frame showing another embodiment, and FIG. 10 is a circuit showing another embodiment. FIG. 3 is a plan view of the substrate. DESCRIPTION OF SYMBOLS 1... Stator core, 2... Pole, 3... Salient pole, 4... Winding frame, 5... Engagement recess, 9... Coil, 10... Rotor, 15... Circuit board, 16...
...Protrusion, 18...Lead wire.

Claims (1)

[Claims for Utility Model Registration] A frame-shaped stator core with a plurality of protruding poles having a plurality of salient poles according to the step angle, and a coil that is fitted onto each pole of the stator core and wound thereon. a winding frame, a circuit board that connects the coil wound on the winding frame and a lead wire and is held on the upper part of the winding frame, and a circuit board disposed in the space of the stator core and protruding from each of the poles. a rotor having salient poles formed on its circumferential surface according to step angles corresponding to the poles; the circuit board is formed in an annular shape; a stepping recess formed on the winding frame to hold each protrusion of the circuit board, and the coil is connected to the protrusion of the circuit board. motor.