JPH04255448A - Winding shaping method for motor - Google Patents

Abstract

PURPOSE:To shape a coil end through a die with a thermal relay being fixed to the upper end of the coil end. CONSTITUTION:A coil 10 is temporarily shaped through a first die where a recess is made at the upper end of the coil end. A thermal relay 12 is fixed temporarily in the recess and bound integrally by means of a string 11 for binding the coil end. Finally, the coil end is finished with the thermal relay being fixed by means of a first die 24 having the flank part 25 of the thermal relay. Manual binding work of the thermal relay can be eliminated after finish shaping of the coil end resulting in automation.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming windings of an electric motor in which a cylindrical thermal relay is attached to the windings.

0002

[Prior Art] Conventionally, in conventional electric motors, a cylindrical thermal relay is attached directly to the coil end of the winding after the winding is formed and bundled, and the thermal relay is crushed when the coil end of the winding is formed. At the same time, the heat of this winding can be efficiently sensed (see, for example, Japanese Utility Model Publication No. 63-5422).

0003

[Problems to be Solved by the Invention] However, in conventional thermal relays, the coil ends of the windings are formed and bundled, and then attached to the coil ends, so the binding work is two-fold.
In addition, the process of tying the thermal relays is a manual process that requires a high level of skill.

[0004] This invention solves the above problems.
It is an object of the present invention to provide a method for forming windings of a motor, which enables automation by tying a thermal relay together with a coil end simultaneously with a tying thread.

[0005]

[Means for Solving the Problems] The present invention includes a stator, a winding wound around the stator, and a cylindrical thermal relay attached to the end face of the coil end of the winding with a binding thread. A first step of temporarily forming the thermal relay by pressing the mounting surface of one of the coil ends of the winding inserted into the stator so as to recess the coil end; After temporarily fixing the thermal relay, the second step is to bind the coil end and the thermal relay with a binding thread, and connect the other end surface of the coil end to the mounting surface of the thermal relay so that the thermal relay can escape. This consists of a third step of finishing molding to the same height.

The present invention also provides a stator, a winding having a main winding and an auxiliary winding wound oppositely around the stator, and an end winding of the main winding of the winding. In an electric motor equipped with a cylindrical thermal relay attached to the end face of the coil end with a binding thread, the thermal relay mounting surface side of the coil end of the winding inserted in the stator is strongly pressed. a first step of temporarily forming; a second step of temporarily fixing the thermal relay to the mounting surface of the coil end; and then binding the coil end and the thermal relay with a binding thread; and installing the thermal relay. The third step is to strongly press the end surface of the coil end other than the surface to final form the end surface.

[0007]

[Operation] This invention is configured as described above, so that
After temporarily pressing the mounting surface of the thermal relay on the end face of the coil end so as to make it concave during temporary forming, and temporarily fixing the thermal relay in this concave part, tie the thermal relay and the coil end with a binding string. After that, the other end face of the coil end is pressed to the same height as the mounting surface of this thermal relay so that the thermal relay can escape, and final molding is performed, so that the thermal relay is crushed during the coil end molding. The coil end is tied with a binding thread at the same time as the end of the coil, allowing for automation.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on the embodiments shown in FIGS. 1 to 5. Reference numeral 1 denotes a closed container, in which an electric motor 2 is housed on the upper side, and a compression element 3 driven by the electric motor is housed on the lower side.

The electric motor 2 is composed of a stator 4 and a rotor 5 disposed inside the stator. The stator 4 includes an iron core 6 formed by laminating electromagnetic steel plates, and a winding 7 wound around the iron core. Winding 7 is main winding 8
and auxiliary winding 9 are provided facing each other with a phase shift of 90 degrees. The winding 7 is provided with coil ends 10 on both sides of the iron core 6.

Numeral 11 is a binding thread for binding the coil end 10 of the winding 7, and 12 is a thermal relay that is integrally bound to the upper end of the coil end 10 by the binding thread 11. This thermal relay has an insulating cover 1 with good thermal conductivity.
3 and the coil end 10 is insulated. The thermal relay 12 is formed of a cylindrical thermally conductive casing 14 and a bimetallic switch 15 housed within the casing. This bimetal switch includes a bimetal piece 17 attached to a conductive plate 16 that is insulated and fixed to the thermally conductive casing 14, a contact 18 attached to this bimetal piece, and a contact 19 fixed to the thermally conductive casing 14. It is formed by. In the thermal relay 12, a thermally conductive casing 14 and a conductive plate 16 are respectively connected between the same electric wires.

Reference numeral 20 denotes a first mold for temporarily forming the coil end 10 of the winding 7, and this mold is provided with a protrusion 22 forming a recess 21 at one of the upper ends of the coil end 10. 23 is a concave portion 21 after being temporarily formed in the first mold 20.
This is a band for temporarily fixing the thermal relay 12 to. 24 is a second mold for finishing molding the other upper end of the coil end 10 to the same height as the recess 21; this mold includes a thermal relay 1;
An escape portion 25 is provided to allow the 2 to escape.

In the method for forming the windings of a motor constructed as described above, the manufacturing order of the stator 4 will be explained. First, the windings 7 are formed by forming a main winding 8 and an auxiliary winding on an iron core 6 made of laminated electromagnetic steel plates. Wind it in the order of 9. Then, the coil end 10 of the winding 7 is temporarily formed using a first mold 20, and a recess 21 is formed at the upper end of this coil end. Thereafter, the thermal relay 12 is temporarily fixed to this recessed portion with a band 23. next,
The thermal relay 12 is integrated with the coil end 10 by the binding thread 11.
After that, the band 23 for temporary fixing is removed. Finally, the coil end 10 of the winding 7 is finished molded in a second mold 24 having a relief part 25 for letting the thermal relay 12 escape so that the upper end is at the same height as the recess 21,
Stator 4 is completed.

When the coil end 10 is temporarily formed in the first mold 20, a recess 21 is formed at the upper end of the coil end, so that the thermal relay 12 can be attached to this recess. There is. In addition, when the coil end 10 is finished molded with the second mold 24, the thermal relay 1
By letting the coil end 10 escape and finishing molding, this thermal relay can be finished molded in a state where it is tied to the coil end 10. Therefore, the thermal relay 12 can be bound together with the coil end 10 using the binding thread 11.

Furthermore, since the thermally conductive casing 14 of the thermal relay 12 is not deformed during final molding, the distance between the contact 18 attached to the bimetal piece 17 and the contact 19 attached to the thermally conductive casing 14 changes, and the characteristics change. or
This prevents the contacts 18 and 19 from remaining attached.

The present invention provides a second mold 24 for molding the coil end 10 with an escape part 25 for letting the thermal relay 12 escape, so that the thermal relay 12 can be attached to the upper end of the coil end 10 using a binding thread. It is designed so that it can be tied together as one.

[0016]

As described above, according to the present invention, there is provided a stator, a winding wound around the stator, and a cylindrical heating element attached to the end face of the coil end of the winding with a binding thread. In the electric motor equipped with a dynamic relay, a first step of temporarily forming the coil end of the winding inserted into the stator by pressing the mounting surface of one of the thermal relays so as to recess the coil end; After temporarily fixing the thermal relay in the recessed part of the coil end, the second step is to tie the coil end and the thermal relay together with a binding thread, and then attach the other end of the coil end to the thermal relay so that the thermal relay can escape. The third step is final molding to the same height as the mounting surface of the winding. Therefore, during the final molding of the coil end of the winding, the thermal relay is molded to allow it to escape, and this thermal relay is molded to the coil end. This allows them to be tied together at the time of binding. Furthermore, by bundling the thermal relay together with the coil end, the present invention eliminates the need for manual bundling of the thermal relay after final molding of the coil end, thereby achieving automation.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a rotary compressor showing an embodiment of the present invention.

FIG. 2 is a plan view of the stator of the invention.

FIG. 3 is an enlarged sectional view of the thermal relay of the present invention.

FIG. 4 is a sectional view showing a state in which the coil end of the winding wire of the present invention is temporarily formed.

FIG. 5 is a sectional view showing a state in which the coil end of the winding wire of the present invention is finished formed.

[Explanation of symbols]

2　Electric motor 4 Stator 7 Winding wire 8 Main winding 9 Auxiliary winding 10 Coil end 11 Binding thread 12 Thermal relay 20 First mold 21 Recess 22 Protrusion 24 Second mold 25 Escape part

Claims (3)

[Claims] Claim 1: An electric motor comprising a stator, a winding wound around the stator, and a cylindrical thermal relay attached to the end face of a coil end of the winding with a binding thread,
A first step of temporarily forming the thermal relay by pressing the mounting surface of one of the coil ends of the winding inserted into the stator so as to recess it, and temporarily fixing the thermal relay in the recess of the coil end. After that, the second step is to bind the coil end and the thermal relay with a binding thread, and finish molding the other end surface of the coil end to the same height as the mounting surface of the thermal relay so that the thermal relay can escape. A method for forming windings of an electric motor, comprising a third step of forming a wire. 2. A stator, a winding having a main winding and an auxiliary winding wound oppositely around the stator, and a coil end of an end winding of the main winding of the winding. In an electric motor equipped with a cylindrical thermal relay attached to the end face with a binding thread, the coil end of the winding inserted in the stator is temporarily formed by pressing strongly against the mounting surface side of the thermal relay. a first step, a second step of temporarily fixing the thermal relay to the mounting surface of the coil end, and then binding the coil end and the thermal relay with a binding thread; A method for forming windings for an electric motor, comprising a third step of final forming by strongly pressing the end face of the coil end. 3. The method for forming windings of a motor according to claims 1 and 2, characterized in that a finishing mold that presses the end face of the coil end is provided with an escape portion for allowing the thermal relay to escape. .