JPH0746785A - Motor - Google Patents

Abstract

PURPOSE:To provide a motor which can maintain excellent quality and facilitates the reduction of man-hours. CONSTITUTION:A board 24 is attached to the one end side of the stator 13 of a motor with a spacer 23 therebetween to form a space behind the board 24. A connector 26 which is connected to a stator coil 17 through a wiring on the board 24 is stored in the space and a lead wire 25 is connected to the connector 26. The lead wire 25 is inserted from the outside of the motor through a through-hole 30 formed in a rear cover 12 after the assembly of the motor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner rotor type motor having a rotor inside a stator.

[0002]

2. Description of the Related Art Generally, in an inner rotor type motor, as shown in FIG. 4, a bottomed cylindrical front cover 1 is used.
A stator 3 is fitted on the inner peripheral side of the rear cover 2, and a rotor 4 is rotatably provided on the inner peripheral side of the stator 3. The stator 3 has a plurality of stator coils 5 wound around the poles of a stator core 7, and externally supplies an electric current to the stator coils 5 through a lead wire 6 to rotate the rotor 4. Conventionally, as a method of connecting the lead wire 6 to the stator coil 5, a method of connecting the stator coil 5 wound around each pole in a predetermined pattern and then soldering the lead wire 6 to this is generally performed. However, such work requires skill and is extremely difficult. In this regard, as shown in FIG.
There is a method in which the substrate 8 is attached to one end side of and the stator coil 5 and the lead wire 6 are connected on the substrate 8. That is, the end portions of the stator coil 5 and the lead wire 6 are soldered to predetermined positions on the substrate 8 so that the two are connected via the wiring provided on the substrate 8.

[0003]

By the way, even in the method using the substrate 8 described above, the lead-out wire 6 is already placed on the substrate 8 during the assembly work of the motor, particularly when the stator 3 is press-fitted into the rear cover 2. Must be soldered.
Therefore, in the conventional motor, the notch 9 is formed at the opening end of the rear cover 2 so as to avoid the interference between the rear cover 2 and the lead wire 6.

However, when the notch 9 is formed in the rear cover 2 as described above, the work of press-fitting the stator 3 into the rear cover 2 can be favorably performed, but the notch 9 expands and the core of the rear cover 2 is made in the press-fitting work. There is a problem that the quality of the motor is deteriorated due to the deviation. That is, since one end of the rotor 4 is rotatably supported at the center of the rear cover 2, the eccentricity of the rear cover 2 leads to the misalignment between the stator 3 and the rotor 4 as it is, the noise is generated, and the torque varies depending on the location. And so on.

Further, when the lead wire 6 is soldered on the substrate 8, the lead wire 6 is stuck around during the motor assembling work, which hinders the assembling work and increases the number of steps.

An object of the present invention is to provide a motor capable of maintaining good quality and reducing the number of assembling steps.

[0007]

In order to achieve the above object, the present invention is for connecting a stator coil and a lead wire to an end portion of a stator press-fitted inside a cover having a bottomed cylindrical shape. In a motor with a board attached, a space is formed between the stator and the board, a connector connected to the stator coil through wiring on the board is housed in the space, and the lead wire is connected to the connector. Is.

Here, it is preferable that the cover has a through hole for inserting the tip of the lead wire from the outside.

It is also preferable to insert the connector pin of the connector into a through hole formed in the board and solder it from the outside of the board.

[0010]

According to the above construction, a space is formed between the stator and the substrate, that is, on the back side of the substrate, and the connector to which the lead wire is connected is accommodated in this space so that the connector is projected to the outside of the stator. The lead wire can be attached without assembling after the motor is assembled. Therefore, the cover into which the stator is press-fitted may have a through hole for inserting the tip of the lead wire later,
It is not necessary to form the notch as in the conventional case. Therefore, even when the stator is press-fitted into the cover, it is possible to eliminate the core misalignment of the cover and assemble it to the true core.

Moreover, since the leader line can be attached after the motor is assembled, the workability can be improved without the leader line being turned around during the assembling work.

Further, by inserting the pin of the connector into a through hole formed on the board and soldering it from the outside of the board, the connector pin is soldered together with the soldering of the stator coil on the board. You can

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a schematic structure of a hybrid type (HB type) stepping motor according to this embodiment. In the figure, 11 and 12 are a bottomed cylindrical front cover and a rear cover, respectively, and a cylindrical stator 13 is fitted on the inner peripheral side of these covers 11 and 12. The stator 13 is configured by inserting an insulator 16 into each of a plurality of poles (teeth) formed on the inner circumference of the stator core 15 and winding a stator coil 17 from above the insulator 16. A rotor 14 is concentrically provided on the inner peripheral side of the stator 13. The rotor 14 is provided with rotor cores 20 and 20 in a state where a permanent magnet 19 is built in the outer periphery of a shaft 18, and the bearings 21 and 22 provided on both sides of the rotor cores 20 and 20 rotate the front and rear covers 11 and 12, respectively. It is supported freely. One end of the shaft 18 is projected to the outside through a through hole of the front cover 11.

An annular substrate 24 is attached to one end side of the stator 13, that is, the right end side in the figure, via a spacer 23 made of an insulating material. The spacer 23 is for forming a space S having a predetermined width between the stator 13 and the substrate 24, and is attached to the end surface of the insulator 16 in the circumferential direction. The substrate 24 is a printed wiring board having wirings 24 a (see FIG. 2) of a predetermined shape on the back and front surfaces, and the insulator 16 is sandwiched by the spacers 23.
It is attached to the end face of the with screws (not shown).
As shown in FIG. 2, a plurality of protrusions 24b are formed on the outer peripheral edge of the substrate 24 at regular intervals in the circumferential direction. The ends of the stator coil 17 (start and end of winding) are formed on these protrusions 24b. Is wound and soldered.

A connector 26 for connecting the lead wire 25 to the wiring 24a on the substrate 24 is housed in the space S formed by the spacer 23. Connector 2
6 is a terminal 27 mounted on the back surface of the substrate 24,
And a plug 28 attached to the tip of the lead wire 25. Here, the terminal 27, as shown in FIG.
Connector pins 27b are arranged in a line in a case 27a into which the plug 28 is inserted. One end of the connector pin 27b extends into the case 27a along the insertion / removal direction of the plug 28, and the other end extends outside the case 27a and is bent at a right angle. The terminal 27 has the other end of the connector pin 27b inserted into a through hole 24c (see FIG. 2) formed in the substrate 24 as shown in FIG.
It is mounted on the substrate 24 by soldering from the (front side). Thus, by inserting the plug 28 on the side of the lead wire 25 into the terminal 27, the lead wire 25 is connected to the stator coil 17 via the connector pin 27b and the wiring 24a.
Connected to.

In FIG. 1, 29 is a bolt for fixing the stator core 15, which is screwed to the rear cover 12 through a through hole formed in the front cover 11 and the stator core 15. Further, 30 is a through hole for inserting the tip of the lead wire 25, that is, the plug 28 from the outside, and is formed in the flange portion 12a of the rear cover 12 so as to face the terminal 27. Further, 31 is a grommet made of silicon rubber for closing the through hole 30.

Next, a procedure for assembling the motor having the above structure will be described.

First, the insulator 16 is inserted into the pole of the stator 13, and a magnet wire is wound on the insulator 16 by an automatic winding machine to form a stator coil 17. When the stator coil 17 is wound in a predetermined pattern, the substrate 24 is attached to one end of the insulator 16 with the spacer 23 interposed. At this time, the terminal 27 of the connector 26 is already accommodated in the space S formed by the spacer 23, and the connector pin 27b of this terminal 27 is inserted into the through hole 24c formed in the substrate 24 and is thus placed on the substrate 24. It's jumping out. In this state, next, after the end portion of the stator coil 17 is entangled with the protrusion 24b on the outer peripheral edge of the substrate 24, the stator coil 17 is flushed on the solder bath to form the wiring 24 on the back and front surfaces of the substrate 24.
a, 24a, the barbed portion 24b of the stator coil 17, and the insertion portion of the connector pin 27b are soldered.
Thereby, the connector pin 27b and the stator coil 17
And the wiring 24a on the substrate 24.

When the stator block is assembled in this way, next, the rotor 14 is inserted into the inner peripheral side of the stator 13, and then the front cover 11 and the rear cover 12 are fitted from both sides of the stator 13. As a result, the stator core 15 is press-fitted into the covers 11 and 12, and the rotor 14 is rotatably supported by the bearings 21 and 22. At this time, since the through hole 30 is simply formed in the flange portion 12a of the rear cover 12, even if the stator core 15 is press-fitted into the rear cover 12, there is no misalignment between the two and a true core is formed. Can be assembled.

When the motor is assembled as described above,
Next, after fixing the stator 13 with the bolts 29, the plug 28 at the tip of the lead wire 25 is inserted from the outside through the through hole 30 formed in the rear cover 12 in advance and inserted into the terminal 29, and then the through hole 30 is formed with the grommet 31. Close up.

As described above, in the stepping motor of this embodiment, the space S having a predetermined width is formed on the back side of the substrate 24, and the lead wire 25 is provided on the substrate 24 via the connector 26 accommodated in this space S. Since the connection is made, the lead wire 25 can be connected after the motor is assembled without the connector 26 protruding to the outer peripheral side of the stator 13.
For this reason, a thick portion is formed at the open end of the rear cover 12 of this embodiment, and it is not necessary to make a notch as in the conventional case (FIG. 4), so that the stator core 15 and the rear cover 12 are not misaligned with each other. Can be fitted. Therefore, there is no misalignment between the stator 13 and the rotor 14, and it is possible to obtain a high-quality motor by preventing noise and rotational fluctuation of output torque during rotational driving. In particular, in the stepping motor as in this example, since the stator 13 and the rotor 14 can be assembled to the true core, the periodic step angle error and the error (hysteresis error) at the time of switching between forward and reverse rotation can be dramatically reduced. can do.

Further, since the lead wire 25 can be attached after the motor is assembled, the lead wire 25 does not go around during the assembly work, and the assembly work can be performed very easily.

Further, in the motor of this embodiment, the connector pin 27b can be inserted into the through hole 24c and soldered to the substrate 24 from the front side thereof, so that the soldering operation for the substrate 24 is performed in one step using the solder bus. be able to. That is, in the conventional method of directly soldering the lead wire on the substrate, the lead wire cannot be soldered on the solder bus, so that the lead wire soldering work and the stator coil soldering work are separate steps. I have to do it in. On the other hand, in this embodiment, since the connector pins 27b can be soldered from the outside of the substrate 24, the stator coil 17
And the connector pin 27b can be soldered together, and the lead wire processing time can be greatly reduced and the assembly work can be automated.

Further, since the lead wire 25 can be attached after the motor is assembled (for example, at the time of shipping), if the motor has the same winding structure, prepare the lead wire 25 according to the length and the wire type. It is not necessary and the inventory can be reduced significantly.

In the above embodiment, the stepping motor has been described as an example, but the motor of the present invention may be an AC servo motor, a DC servo motor or the like. In addition, a space S is provided between the stator 13 and the substrate 24.
Although the spacer 23 is used to form the space, this is not always necessary, and for example, one end of the insulator 16 may be extended to the outside to form a space.

[0027]

In summary, according to the present invention, the following excellent effects are exhibited.

(1) A space is formed between the stator and the substrate,
Since the connector to which the lead wire is connected is housed in this space, it suffices to form a through hole in the cover for inserting the lead wire later, and the cover and the stator can be assembled together without causing misalignment. it can. Therefore, it is possible to eliminate misalignment between the stator and the rotor, and maintain good motor quality.

(2) Moreover, since the lead wires can be connected after the motor is assembled, the lead wires do not turn around during the assembling work, so that the workability can be improved and the number of man-hours can be reduced.

(3) Also, since the connector pins are inserted into the through holes formed in the board and soldered from the outside,
Connector pins can be soldered together with stator coil soldering.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a motor of the present invention.

FIG. 2 is a diagram showing an example of a substrate applied to a motor of the present invention, (a) showing a front surface and (b) showing a back surface.

FIG. 3 is a diagram showing an example of a connector applied to the motor of the present invention.

FIG. 4 is a vertical sectional view showing a conventional motor.

[Explanation of symbols]

 11 Front Cover 12 Rear Cover 13 Stator 14 Rotor 17 Stator Coil 23 Spacer 24 Board 24a Wiring 25 Lead Wire 26 Connector 27b Connector Pin 30 Through Hole

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Tomoaki Ariga 3934 Inatomi, Tatsuno-cho, Kamiina-gun, Nagano Ishikawajima General-Purpose Machinery Co., Ltd. Tatsuno Factory

Claims (3)

[Claims] 1. A motor in which a substrate for connecting a stator coil and a lead wire is attached to an end portion of a stator press-fitted inside a cover having a bottomed cylindrical shape, and between the stator and the substrate. A motor characterized in that a space is formed, a connector connected to a stator coil through wiring on the substrate is housed in the space, and the lead wire is connected to the connector. 2. The motor according to claim 1, wherein the cover is formed with a through hole for inserting the tip of the lead wire from the outside. 3. The motor according to claim 1, wherein the connector pin of the connector is inserted into a through hole formed in the board and soldered from the outside of the board.