JPH0537652Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of an electric cord pull-out portion of a rotating electric machine such as a motor or a generator.

[Prior Art] In a rotating electric machine such as a brushless electric motor, a stator side is provided with a printed circuit board on which drive circuit components, sensors, etc. are mounted. A plurality of electrical cords are soldered to predetermined circuit portions of the printed circuit board, and these electrical cords are led out and connected to an external circuit such as a power supply or a control circuit.

In this case, if the electrical cord soldered to the printed circuit board is pulled out as it is, when an external force is applied to the electrical cord, force is applied directly to the soldered portion. Therefore, if tension is applied to the electrical cord or an object hits the electrical cord, the soldered portion may peel off and the electrical cord may come off.

To prevent this, a special clamping device is used to clamp the electrical cord to the stator side of the rotating electrical machine, but using a clamping device increases the number of parts and therefore increases costs. I can't do it.

Therefore, the electrical cord pull-out structure shown in FIGS. 2A and 2B was proposed. The illustrated rotating electric machine is a brushless electric motor, which includes a stator 4 consisting of a winding 3 wound around an armature core 2 attached to a stator frame 1, and a cup-shaped rotating body 5 with a permanent It consists of a rotor 7 to which magnetic poles 6 made of magnets are attached.

The frame 1 is provided with a flange 1b, and one end of a printed circuit board 8 is fixed to this flange 1b with screws 9.

A plurality of electrical cords 12, 12, . . . are used to connect the circuit provided on the printed circuit board 8 to an external circuit.
is provided. Preliminary soldering is applied to one end of the core wires of these electric cords, and one end 12a of the core wire to which preliminary soldering has been applied is mounted on the printed circuit board 8 from the surface 8a side (the surface opposite to the flange 1b) of the printed circuit board 8. are inserted into the holes 13, 13, . . . , and soldered to the circuit pattern on the back surface (the surface facing the flange 1b) 8b of the printed circuit board. Electrical cords 12, 12, ... are printed circuit board 8
The electrical cords 12, 12, .

By adopting this kind of cord pull-out structure, even if an external force is applied to each electrical cord, no force is applied directly to the soldered parts, which prevents the soldered parts from peeling off or the cords from breaking. be able to.

[Problem to be solved by the invention] In a conventional rotating electric machine as shown in FIGS. 2A and B, after preliminary soldering is applied to the tip 12a of the core wire of each electric cord, the core wire to which this preliminary solder has been applied is The tip 12a of the circuit board 8 is inserted into the hole 13 of the printed circuit board 8 and soldered to a predetermined circuit portion of the printed circuit board. In this case, the core wire cannot be smoothly inserted into the hole 13 unless preliminary soldering is applied very carefully. Therefore, with conventional rotating electric machines, the work of connecting the cords took a lot of time and effort, resulting in a problem of poor work efficiency.

The purpose of the present invention is to clamp an electrical cord without increasing the number of parts or requiring the troublesome work of inserting the core wire of the electrical cord into a hole.
To provide a rotating electric machine that prevents excessive force from being applied to the soldered parts of each electric cord.

[Means for Solving the Problems] As shown in FIGS. 1A and 1B showing an embodiment of the present invention, the flange 1b provided on the stator side
A rotating electric machine including a printed circuit board 8 arranged to face each other, and a plurality of electric cords 12, 12, . . . soldered to a predetermined circuit pattern provided on the surface of the printed circuit board 8 on the flange 1b side It has a simple structure and is designed to clamp each electric cord.

Therefore, in the present invention, a cord holding hole 16 having a length longer than the sum of the outer diameter dimensions of the plurality of electric cords 12, 12, ... is provided in the printed circuit board, and a portion of the flange facing the cord holding hole 16 is provided. A cord holding projection 1c is provided which extends in the same direction as the cord holding hole. Then, the plurality of electrical cords 12, 12, . It is held between the edge of the holding hole 15 and the cord holding projection 1c.

[Function] With the above configuration, each electrical cord is pressed against the cord holding hole side by the cord holding protrusion, so that a portion of each electrical cord is inserted into the cord holding hole and the cord It is held and clamped between the presser projection and the presser projection.

As described above, according to the present invention, each electrical cord is clamped without providing a special clamping tool, so damage to the soldered portion of the electrical cord can be prevented without increasing the number of parts, and costs can be reduced. It is possible to reduce the

Furthermore, since the electrical cord is pulled out by passing between the printed circuit board and the flange, there is no need to pass the core wire of the electrical cord through a hole in the printed circuit board. Therefore, it is possible to simplify the work of pulling out the electric cord and improve the efficiency of the motor assembly work.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1A and 1B.

1A and 1B show an embodiment in which the present invention is applied to a brushless electric motor similar to that shown in FIGS. 2A and 2B. The electric motor of this embodiment includes a stator frame 1.
An annular armature core 2 is fitted and attached to the outer periphery of a boss portion 1a provided in the main body. A winding 3 is wound around the armature core 2, and the iron core 2 and the winding 3 constitute a stator 4 of the motor.

A rotating shaft (not shown) is also supported on the boss portion 1a of the stator frame 1, and a cup-shaped rotating body 5 is attached to this rotating shaft. A magnetic pole 6 made of a permanent magnet is attached to the inner circumference of the rotating body 5, and the rotating body 5 and the magnetic pole 6 constitute a rotor 7.

One end of a printed circuit board 8 is fixed to a flange 1b provided on the stator frame 1 with a screw 9, and the back surface 8b of the printed circuit board 8 and the flange 1b are arranged to face each other in the axial direction of the motor.

The other end of the printed circuit board 8 is brought into contact with the armature core 2 via a collar 10 and is fixed to the core 2 with screws 11 .

Although not shown, the printed circuit board 8 is equipped with electronic components constituting a drive circuit for the motor, a sensor for detecting the position of the rotor, and the like.

A plurality of electrical cords 12, 12, . . . are used to connect the circuit provided on the printed circuit board 8 to an external circuit.
is provided. One end 12a of the core wire of these electric cords is connected to the back surface of the printed circuit board 8 (flange 1
It is connected by solder 17 to a predetermined portion of the circuit pattern provided on the b-side surface) 8b.

The printed circuit board 8 has an elongated cord holding hole 1 extending in a direction perpendicular to the direction in which the electric cord is pulled out.
6 is provided. The length of this cord holding hole 16 is set to be longer than the sum of the outer diameter dimensions of the electric cords 12, 12, . . . drawn out to the outside.

On the other hand, a cord holding projection 1c extending in the same direction as the cord holding hole 16 is provided in a portion of the flange 1b facing the cord holding hole 16. This protrusion 1c has a length slightly shorter than the length of the cord holding hole 1b, and when the printed circuit board 8 and the flange 1b are brought close to each other without placing an electrical cord between the printed circuit board 8 and the flange 1b. In addition, the width of the tip of the cord-holding projection 1c is narrower than the width of the base end of the cord-holding projection 1c so that the tip of the cord-holding projection 1c fits into the cord holding hole 16.

Electrical cords 12, 12, . . . soldered to the back surface of the printed circuit board 8 are gathered together between the cord holding hole 16 and the cord holding projection 1c and arranged in a line in the length direction of the cord holding hole. Then, after sandwiching the cords 12, 12, ... between the cord holding protrusion 1c and the cord holding hole 16, screw the screws 9, 9.
The printed circuit board 8 is fastened to the flange 1 by.
Thereby, each cord 12 is firmly held in a state where it is sandwiched between the protrusion 1c and the edge of the cord holding hole 16.

Therefore, even if a tensile force is applied to the electrical cord 12 from the outside, no force is directly applied to the soldered portion of the electrical cord, so there is no risk of damage to the soldered portion of the electrical cord.

In the above embodiments, an electric motor is taken as an example, but the present invention can be widely applied to rotating electric machines provided with a stator-side printed circuit board.

[Effects of the invention] As described above, according to the invention, each electrical cord is pressed against the cord holding hole side by the cord holding protrusion, and a part of each electrical cord is bitten into the cord holding hole. Since the cord is held between the cord holding hole and the cord holding protrusion, each electric cord can be clamped without the need for a special clamping tool, and the cord can be clamped without increasing the number of parts. This has the advantage of preventing damage to the soldered parts.

Furthermore, since the electrical cord is drawn out through the space between the printed circuit board and the flange, there is no need to pass the core wire of the electrical cord through a hole in the printed circuit board. Therefore, it is possible to simplify the work of pulling out the electric cord and improve the efficiency of the motor assembly work.

[Brief explanation of the drawing]

FIG. 1A is a sectional view of a main part showing an embodiment of the present invention;
FIG. 1B is a plan view of the main part showing the vicinity of the cord pull-out part in the same embodiment, FIG. 2A is a cross-sectional view of the main part showing the cord pull-out part of a conventional rotating electrical machine, and FIG.
FIG. 2 is a plan view of main parts showing the cord drawer part of the conventional example. 1... Stator frame, 1b... Flange, 1
c... Cord holding protrusion, 4... Stator, 7...
Rotor, 8... Printed circuit board, 12... Electrical cord, 16... Cord holding hole.

Claims (1)

[Claims for Utility Model Registration] A printed circuit board disposed opposite to a flange provided on the stator side, and a plurality of circuit boards soldered to a predetermined circuit pattern provided on the surface of the printed circuit board on the flange side. A rotating electric machine including an electric cord, wherein a cord holding hole having a length greater than or equal to the sum of outer diameter dimensions of the plurality of electric cords is provided in the printed circuit board, and a portion of the flange facing the cord holding hole. is provided with a cord holding protrusion extending in the same direction as the cord holding hole, the plurality of electrical cords are pulled out through between the cord holding hole and the cord holding protrusion, and the printed circuit board is attached to the flange. A rotating electrical machine, wherein the plurality of electric cords are fastened to each other and held between an edge of the cord holding hole and a cord holding projection.