JPH08149731A - Field coil for electric rotating machine and manufacture thereof - Google Patents

Abstract

PURPOSE: To obtain a field coil for an electric rotating machine in which the winding work can be carried out easily with high efficiency in a short time and the welding work can be facilitated and automated. CONSTITUTION: A core part 9A and a bobbin plate 9B are positioned by means of a jig 21 while holding a mold bobbin 9C applied with a field coil 8 between them. The linear contact part between the beveled part 9a of the core part 9A and the bobbin plate 9B is then jointed by projection welding while applying pressure from above the bobbin plate 9B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a field coil device for a rotating electric machine such as an inductor type AC generator used for an alternator and a method for manufacturing the same.

[0002]

2. Description of the Related Art FIG. 7 is a sectional view showing a conventional inductor type AC generator, in which 1 is a pulley, 2 is a shaft connected to the pulley 1, and 3 is fixed to the shaft 2. It is a rotating rotor. In the rotor 3, 3A is a first claw portion that constitutes one inductor, 3B is a second claw portion that constitutes the other inductor, 3C is a non-magnetic ring, and 3D is a core.
4 is a bracket front, 5 is a bracket rear, and these both support the shaft 2 rotatably via bearings 6 and 7. Reference numeral 8 is a field coil fixed to the bracket rear 5 via a field core 9, and 10 is a stator fixed between the bracket front 4 and the bracket rear 5.
A is a stator coil. 11 is a rectifier fixed to the bracket rear 5 and connected to the stator coil 10A,
Reference numeral 12 is a regulator fixed to the bracket rear 5 and connected to the field coil 8, and 13 is a fan fixed to the shaft 2 together with the pulley 1 to rotate.

Next, the operation will be described. Now, the pulley 1 is rotationally driven by a belt from a prime mover (not shown), which causes the rotor 3 fixed to the shaft 2 to rotate. The first claw portion 3A and the second claw portion 3B of the rotor 3 have the field coil 8
The inductors are excited by different polarities from each other, and are arranged so as to face each other alternately. The non-magnetic ring 3 is provided between the claws.
The bond is fixed at C. When the rotor 3 rotates and crosses the magnetic field generated by the field coil 8, an induced electromotive force is generated in the stator coil 10A. Since this induced electromotive force is a three-phase alternating current, it is full-wave rectified into a direct current by the rectifier 11 and supplied to a battery or an electric load. The regulator 12 controls the current flowing through the field coil 8 in order to maintain the electromotive force induced in the stator coil 10A at a constant voltage. The bracket front 4 and the bracket rear 5 form an outer frame of the generator and are attached and fixed to the prime mover. The fan 13 rotates together with the pulley 1 to cool the inside of the generator.

By the way, as shown in FIG. 8, the field core 9 of the conventional inductor type AC generator configured as described above has a thick ring-shaped iron core portion 9A which forms a magnetic circuit,
Thin-walled cylindrical bobbin plate 9 having a collar portion 9B1
B, a resin mold bobbin 9C for coil insulation. The bobbin plate 9B is inserted and assembled in the guide portion 9D of the iron core portion 9A, and the bobbin plate 9B and the iron core portion 9A are welded and fixed by spot welding at several points on the outer circumference of the guide portion 9D. The mold bobbin 9C is provided beforehand with a notch for inserting a spot welding electrode at a position corresponding to the welding point, and spot welding can be performed from the notch. Groove portion 9C1 of mold bobbin 9C of field core 9 configured as described above
The field coil device of the inductor type AC generator has been manufactured by winding the field coil 8 on.

[0005]

Since the field coil device of the conventional inductor type AC generator is constructed as described above, the field core 9 is completed for the winding work of the field coil 8. Since the field core 9 having the iron core portion 9A has a large weight, the winding speed of the winding machine can be limited, and the workability of the winding work is poor, resulting in poor productivity. There was a problem in terms of manufacturing cost. In addition, the work of spot welding the outer periphery of the guide portion 9D of the iron core portion 9A and the inner periphery of the bobbin plate in order has to be performed manually, which is difficult to automate.

The present invention has been made to solve the above problems, and the field coil winding work of the field coil device can be performed easily and efficiently in a short time, and the welding work is easy. It is an object of the present invention to obtain a field coil device for a rotary electric machine that can be automated by the above method, and further to provide a manufacturing method suitable for this device.

[0007]

A field coil device for a rotary electric machine according to the present invention has a ring-shaped iron core portion having a chamfered portion formed on one inner peripheral end surface thereof, and is arranged in the axial direction of the iron core portion. A bobbin plate having one end welded to the chamfered portion and the other end having a collar portion, and a bobbin wound between the iron core portion and the collar portion of the bobbin plate and wound with a field coil. .

A plurality of protrusions provided on the end surface of the bobbin plate are welded to the chamfered portion of the iron core portion.

Further, a ring-shaped iron core portion, a bobbin plate arranged in the axial direction of the iron core portion, having one end having a plurality of protrusions welded to the iron core portion and having a brim portion at the other end, and the iron core. And a bobbin around which a field coil is wound, which is sandwiched between the collar portion and the collar portion of the bobbin plate.

Further, a ring-shaped iron core portion having a concavo-convex portion formed on one inner peripheral end surface, and an axially-arranged iron core portion are provided, and one end is welded to the concavo-convex portion and a brim portion is provided at the other end. The bobbin plate and the bobbin sandwiched between the iron core portion and the collar portion of the bobbin plate and around which a field coil is wound are provided.

Further, according to the method of manufacturing a field coil device for a rotary electric machine of the present invention, the step of winding the field coil on the bobbin, and the bobbin wound with the field coil are formed into a ring shape and a flange part of the bobbin plate. The step of placing the bobbin plate and the ring-shaped iron core portion in contact with each other using a positioning jig so as to be sandwiched by the iron core portion, and the step of joining the contact portion of the iron core portion and the bobbin plate by projection welding. It includes.

[0012]

Since the field coil device for a rotary electric machine according to the present invention is constructed so that the field coil can be wound around the mold bobbin before the iron core portion, the bobbin plate and the mold bobbin are integrally formed, Winding work of the field coil is easy and can be efficiently performed in a short time.

Further, according to the manufacturing method of the present invention, the iron core portion and the abutting portion of the bobbin plate are joined by projection welding, so that the welding method is easy, automation is possible, and efficient manufacturing is possible.

[0014]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a field coil device of the present invention, FIG.
FIG. 3 is an enlarged cross-sectional view of an essential part of the welded portion of the iron core portion and the bobbin plate before welding, and FIG. 3 is an enlarged sectional view of an essential part of the welded portion of the iron core portion and the bobbin plate after welding. 1, 2, and 3, 8 is a field coil, 9A is an iron core, and 9 is
B is a bobbin plate having a collar portion 9B1, 9C is a mold bobbin, and 9a is a chamfered portion provided on the iron core portion 9A.
The chamfer angle α may be arbitrarily set within the range of 0 <α <90 °, but 30 ° <α <60 ° is suitable. Reference numeral 20 denotes a welded portion of the chamfered portion 9a of the iron core portion 9A and the bobbin plate 9B. Reference numeral 21 is a positioning jig for accurately producing the coaxiality between the iron core portion 9A and the bobbin plate 9B, and 22 and 23 are welding electrodes.

The field coil device of the present invention thus constructed has the iron core portion 9A and the collar portion 9B of the bobbin plate 9B.
A field bobbin 9 having a field coil 8 wound between 1 and 2.
With the C arranged, the jig 21 is used for positioning, and then the welding electrode 2 is pressed while applying pressure from above the bobbin plate 9B.
When a current is applied at 2 and 23, the chamfered portion 9 of the iron core portion 9A is
The metal is melted and joined by the current concentration on the linear contact portion between a and the bobbin plate 9B. Such welding method is called projection welding.

As described above, according to the present embodiment, after the field coil 8 is wound on the mold bobbin 9C by the automatic winding machine, the heavy core portion 9A and the bobbin plate 9B are integrally formed. As a result, the workability of the winding work is improved, and the welding method is easy and can be automated, so that an inexpensive and highly reliable field coil device can be obtained.

Example 2. In the above embodiment, the core portion 9
The chamfered portion 9a of A and the bobbin plate 9B are linearly welded on the entire circumference. However, as shown in FIG. 4, a plurality of protrusions 9b are provided on one end surface of the bobbin plate 9B. Welding may be performed at the contact portion between the protrusion 9b and the chamfered portion 9a of the iron core portion 9A.

Example 3. In addition, as shown in FIG.
Instead of providing the chamfered portion on A, the end surface of the iron core portion 9A and the protrusion 9b of the bobbin plate 9B may be contacted and welded.

Example 4. Further, as shown in FIG. 6, unevenness may be formed on one end surface of the iron core portion 9A by forging or the like, and the unevenness may be brought into contact with the end surface of the bobbin plate 9B to perform welding.

[0020]

As described above, according to the present invention, the field coil can be wound around the mold bobbin before the iron core portion, the bobbin plate and the mold bobbin are integrally formed. The winding work of the magnetic coil is easy, and there is an effect that it can be efficiently performed in a short time.

Further, since the welding method is easy and can be automated, there is an effect that an inexpensive and highly reliable field coil device for a rotating electric machine can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a field coil device of an AC generator that is an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part showing a state before welding of the iron core part and the bobbin plate of the field coil device according to the embodiment of the present invention.

FIG. 3 is an enlarged cross-sectional view of an essential part showing a state after the welding of the iron core portion and the bobbin plate of the field coil device according to the embodiment of the present invention is completed.

FIG. 4 is a cross-sectional view showing a state before welding of the field coil device which is Embodiment 2 of the present invention.

FIG. 5 is a cross-sectional view showing a state before welding of the field coil device which is Embodiment 3 of the present invention.

FIG. 6 is a cross-sectional view showing a state before welding of the field coil device according to the fourth embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a conventional inductor type AC generator.

FIG. 8 is a sectional view showing a field core of a conventional inductor type AC generator.

[Explanation of symbols]

8 field coil, 9 field core, 9A iron core part, 9a
Chamfer, 9B bobbin plate, 9b protrusion, 9C mold bobbin, 20 weld, 21 positioning jig, 2
2,23 Welding electrode.

Claims (5)

[Claims] 1. A ring-shaped iron core portion having a chamfered portion formed on one inner peripheral end surface, which is arranged in the axial direction of the iron core portion and has one end welded to the chamfered portion and a brim portion at the other end. A bobbin plate having, and sandwiched between the iron core portion and the collar portion of the bobbin plate,
A field coil device for a rotating electric machine, comprising a bobbin around which a field coil is wound. 2. The field coil device for a rotary electric machine according to claim 1, wherein a plurality of protrusions provided on an end surface of the bobbin plate are welded to the chamfered portion of the iron core portion. 3. A ring-shaped iron core portion, a bobbin plate which is arranged in the axial direction of the iron core portion, has one end having a plurality of protrusions welded to the iron core portion, and has a brim portion at the other end, the iron core portion And it is clamped by the collar of the bobbin plate,
A field coil device for a rotating electric machine, comprising a bobbin around which a field coil is wound. 4. A ring-shaped iron core portion having an uneven portion formed on one inner peripheral end surface, which is arranged in the axial direction of the iron core portion and has one end welded to the uneven portion and a brim portion at the other end. The bobbin plate is sandwiched between the iron core portion and the collar portion of the bobbin plate,
A field coil device for a rotating electric machine, comprising a bobbin around which a field coil is wound. 5. A step of winding a field coil around a bobbin,
The bobbin around which the field coil is wound is arranged using a positioning jig so as to be sandwiched between the collar portion and the ring-shaped iron core portion of the bobbin plate, and the step of bringing the bobbin plate and the ring-shaped iron core portion into contact with each other, A method of manufacturing a field coil device for a rotating electric machine, comprising the step of joining the iron core portion and the contact portion of the bobbin plate by projection welding.