JPH04331435A - Motor for refrigerator - Google Patents

Abstract

PURPOSE:To provide a motor for a refrigerator, which has a lead wire with a small diameter capable of being wired in small space and is easy in manufacture, by covering the magnet wire of a stator coil with a sleeve, which is entwined of fibers having refrigerant resistance and insulation property, thereby forming a lead wire. CONSTITUTION:In a motor 6 for a refrigerator, wherein a lead wire 18 for connecting a stator coil 11 with an external power source contacts directly wit a refrigerant, the end of a magnet wire, which constitutes the stator coil 11 is extended to outside of the motor where it does not contact with the refrigerant, and magnet wire extended from the stator coil 11 is covered with a sleeve 23 being entwined of insulating fibers which do not deteriorate for a long time in refrigerant so as to make a lead wire 18.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a motor used in a refrigeration machine, and in particular, the present invention relates to a motor used in a refrigeration machine. A motor for refrigeration machinery that is covered with a sleeve made of fibers that have the property of not deteriorating over a long period of time (hereinafter referred to as refrigerant resistance) and has insulation properties, and electricity is directly supplied to the stator coil through the end of this magnet wire. Regarding.

0002

[Prior Art] Generally, in motors for refrigeration machines in which the lead wire connecting the stator coil and an external power source comes into direct contact with the refrigerant, the windings of the stator coil are The magnet wire is cut at a predetermined distance from the section, and a lead wire coated with a refrigerant-resistant resin is connected to the end of the magnet wire. FIG. 3 shows the internal configuration of a conventional refrigeration machine motor. A conventional motor 31 for a refrigeration machine includes a stator assembly 32 and a rotor assembly 33. Stator assembly 32 is stator core 3
4 and a stator coil 35. The stator core 34 has 12 magnetic poles 36 projecting inward, and a set of three of the magnetic poles 36 is wound with a conducting wire (hereinafter referred to as magnet wire) to form a stator coil 35. The stator coil 35 is connected to the rotor assembly 3
The stator coil 35 is formed in three layers concentrically with the rotating shaft 37 of the stator coil 35, and each layer of the stator coil 35 is arranged offset by one magnetic pole, as shown in the figure. The magnet wires of each layer of stator coil 35 are cut a short distance from the coil windings so that the ends do not touch each other. End portion 3 of the magnet wire protruding from the winding portion of the stator coil 35
8 is a lead wire 4 in which a conducting wire 39 is coated with a fluororesin 40;
Connected to 1. A portion where the conductive wires are connected is inserted into an insulating protective tube 42 to form a connecting portion 43. On the other hand, the rotor assembly 33 has the rotating shaft 3 at the center.
7, and has magnetic poles exhibiting different magnetism alternately in the circumferential direction. In order to operate the conventional refrigeration machine motor 30 having the above structure, the current of the external power source is controlled by an external control circuit (not shown), and the controlled current is applied to the lead wire 41.
is supplied to the stator coil 35 via. Due to the switching function of the control circuit, the current is switched at predetermined time intervals and sequentially flows through each layer of the stator coil 35, and a rotating magnetic field is generated inside the stator assembly 32. The rotor assembly 33 is rotationally driven by the interaction between this rotating magnetic field and the magnetic poles on the outer peripheral surface of the rotor assembly 33. The fluororesin 40 of the lead wire 41 insulates the conductor 39, and in addition to the thickness necessary for insulation, so that the lead wire 41 can be used for a long time in the refrigerant, there is an excess thickness in consideration of the deterioration of the resin due to the refrigerant. It has a thickness. Further, the refrigeration machine into which the refrigeration machine motor 30 is installed is provided with a space for accommodating the lead wire 41 and its connecting portion 43, so that the motor 30 can be installed therein.

0003

[Problems to be Solved by the Invention] However, in the above-mentioned conventional motor for refrigeration machines, the insulating resin layer on the surface of the lead wire has a thickness necessary for insulating the conductor wire and a thickness due to deterioration of the resin due to the refrigerant. Since the diameter of the lead wire is large, the diameter of the entire lead wire is large. Due to the large diameter of the lead wire, the lead wire cannot be bent at a steep angle, making it difficult to route the lead wire in a narrow space inside the refrigeration machine. In addition, in the conventional motor for refrigeration machinery mentioned above, it is necessary to connect the lead wire and the magnet wire of the stator coil, which requires a lot of effort and time, and the productivity of the motor for refrigeration machinery is low. There was a problem. Furthermore, since the connecting portion between the lead wire and the magnet wire is inserted into the insulating protective tube, the connecting portion occupies a large space, which poses a problem that prevents miniaturization of the motor for the refrigeration machine. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a motor for a refrigeration machine that has a small-diameter lead wire that can be easily wired in a narrow space and is easy to manufacture.

0004

[Means for Solving the Problems] In order to achieve the above object, a motor for a refrigeration machine according to the present invention has a stator coil and The end of the magnet wire constituting the stator coil is extended to the outside of the motor where it does not come into contact with the refrigerant, and the magnet wire extending from the stator coil is covered with a sleeve made of insulating fiber that does not deteriorate in the refrigerant for a long time. It is characterized by the formation of

[0005]

[Operation] The lead wire of the refrigerating machine motor of the present invention is composed of a stator coil magnet wire and a sleeve covering the magnet wire. Since the sleeve is knitted from flexible fibers, it can be easily bent to steep angles. Furthermore, the fibers forming the sleeve have insulating properties and do not deteriorate even when used in a refrigerant for a long time, so the thickness of the sleeve can be reduced to the minimum thickness required for insulation. This reduces the diameter of the lead wire, making it easier to wire in a narrow space. Further, in the refrigeration machine motor of the present invention, there is no need to connect the lead wire and the magnet wire, so the manufacturing process of the refrigeration machine motor is simplified, and together with the ease of wiring the lead wire, the manufacturing process is simplified. A simple motor for refrigeration machinery can be obtained.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. Before explaining the lead wire, which is the main part of the present invention, FIG.
Explain using. FIG. 2 shows the entire compression device of the refrigeration machine. A compression device 1 for a refrigeration machine has a hollow cylindrical casing 2, and the inside of the casing 2 is separated into a compression chamber 4 and a wiring chamber 5 by a partition wall 3, as shown in the figure. A motor 6 and a vane 7 are installed in series inside the compression chamber 4. The motor 6 is composed of a stator assembly 8 and a rotor assembly 9, and the stator assembly 8 is fixed to the inner peripheral surface of the casing 2. The stator assembly 8 consists of a stator core 10 and a stator coil 11. The rotor assembly 9 has balance weights 12 on both end faces and a rotating shaft 13 in the center. The rotating shaft 13 is connected to an eccentric rotor 14 that is in sliding contact with the vane 7, and is configured to rotate together with the eccentric rotor 14. The vane 7 is supported by a frame 15 so as to be slidable in the radial direction of the rotating shaft 13. Furthermore, the upper and lower end surfaces of the vane 7 are slidably supported by a vane frame 60. A lead wire 18 connecting the stator coil 11 of the motor 6 and an external power source is drawn out from the upper part of the stator coil 11, penetrates the partition wall 3, and is connected to an external connection terminal 19 inside the wiring chamber 5. The portion through which the lead wire 18 passes through the partition wall 3 is sealed. A suction pipe 20 is provided at the lower part of the outer peripheral surface of the casing 2 so as to penetrate through the wall of the casing 2 . On the other hand, casing 2
A discharge pipe 21 is provided on the upper end surface, and this discharge pipe 21 is provided to penetrate the wall of the casing 2 and the partition wall 3, and each of the penetrating portions is sealed. In the compression device 1 for a refrigeration machine having the above structure, when the motor 6 is operated, the eccentric rotor 14 in sliding contact with the vane 7 rotates, and the working fluid (
(hereinafter referred to as refrigerant), as shown by the arrow in the figure, the suction pipe 2
0, is compressed by the eccentric rotor 14, is pushed upward through the discharge valve provided in the upper vane frame 60, contacts the entire motor 6, and is concentrated at the inlet of the discharge pipe 21. flows. Since the refrigerant flows as described above, the lead wire 18 is always in contact with the refrigerant during operation of the motor 6. Therefore, the lead wire 18 must have insulating properties as well as refrigerant resistance.

FIG. 1 shows the internal structure of a motor 6 for a refrigeration machine according to the present invention. The stator assembly 8 is composed of a stator core 10 and a stator coil 11. The stator core 10 has 12 magnetic poles 22 projecting inward, and a set of three magnetic poles 22 is wound with a magnet wire to form the stator coil 11. The stator coil 11 is formed in three layers concentrically with the rotating shaft 13 of the motor 6, and the stator coils 11 in each layer are arranged offset by one magnetic pole, as shown in the figure. The ends of the magnet wires in each layer of the stator coil 11 extend to the outside of the motor 6 where they do not come into contact with the refrigerant. The end portion of the magnet wire extending from the winding portion of the stator coil 11 is covered with a sleeve 23 knitted from Tetoron fiber having refrigerant resistance and insulation properties. The magnet wire covered with the sleeve 23 is once fixed to the main body of the motor 6 by an insulating thread 24, and then wired to a predetermined position, and its end is connected to a connecting terminal 25 connected to an external power source. ing. The connecting terminal 25 and the magnet wire covering the sleeve 23 constitute a lead wire 18 of the motor 6, and the stator coil 11 is configured to be supplied with current through the lead wire 18. The number of lead wires 18 is equal to the number of phases of the drive current of the stator coil 11. Adhesive or adhesive is applied to the surface of the sleeve 23 of these lead wires 18, and when the motor 6 is assembled, these lead wires 18 form one bundle. The rotor assembly 9 is rotatably supported inside the stator assembly 8, has a rotating shaft 13 at the center, and has magnetic poles exhibiting different magnetism alternately in the circumferential direction of the outer periphery.

To operate the motor 6 having the above structure, the current of the external power source is controlled by an external control circuit (not shown), and the controlled current is supplied to the stator coil 11 via the lead wire 18. Due to the switching function of the control circuit, the current is switched at predetermined time intervals and is sequentially applied to each layer of the stator coil 11. As a result, the stator assembly 8 generates an internal rotating magnetic field, and the interaction between this rotating magnetic field and the magnetic poles on the outer peripheral surface of the rotor assembly 9 drives the rotor assembly 9 to rotate. Since the sleeve 23 is made of Tetoron-based fibers having insulation and refrigerant resistance, the thickness of the sleeve 23 is extremely thin, and the sleeve 23 itself can be easily bent at a steep angle. Further, since the lead wire 18 is formed of the magnet wire of the stator coil 11, the diameter of the lead wire 18 itself is extremely small. The lead wire 18 constituted by the sleeve 23 and the magnet wire has a small diameter and can be easily bent, and can be wired in a narrow internal space of the compression device 1 of a refrigeration machine. Moreover, the motor 6 for a refrigeration machine according to the present invention has the following features:
Magnet wire of stator coil 11 and lead wire 18
Since there is no need to connect the magnet wire to the magnet wire, it is easy to manufacture the motor for the refrigeration machine, and the space for accommodating the connecting portion between the lead wire and the magnet wire can be saved, and the motor can be made smaller. Further, since adhesive or adhesive is applied to the surface of the sleeve 23 of each lead wire 18, the lead wires 18 are bonded or adhered to each other and easily become one bundle, and the motor 6 is connected to the refrigeration machine. When assembled into the compression device 1, the work of passing the lead wire 18 through the lead wire through hole of the partition wall 3 of the compression device 1 becomes easy.

[0009]

Effects of the Invention As is clear from the above description, according to the present invention, the magnet wire of the stator coil is used as the lead wire, and the insulating fiber that does not deteriorate in a refrigerant for a long time is used as the insulating coating for the lead wire. Since the sleeve made of the above is used, it is possible to obtain a small diameter and flexible lead wire, and it is possible to obtain a motor for a refrigeration machine in which the lead wire can be easily wired in a narrow space inside the refrigeration machine. Further, the lead wire of the refrigeration machine motor of the present invention can omit the conventional connecting portion between the magnet wire and the lead wire, and can contribute to downsizing of the refrigeration machine motor.

Furthermore, since the work of connecting the magnet wire of the motor and the lead wire can be omitted, it is possible to obtain a motor for a refrigeration machine that is easy to manufacture, in combination with the ease of wiring the lead wire.

[0011] In a motor for a refrigeration machine that has lead wires coated with adhesive or adhesive on the sleeve surface, the lead wires easily form a bundle, which makes it easy to incorporate this motor into the refrigeration machine. Can be done.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a motor for a refrigeration machine according to the present invention in a direction perpendicular to a rotation axis.

FIG. 2 is a side sectional view showing the entire compression device of a refrigeration machine incorporating the refrigeration machine motor of the present invention.

FIG. 3 is a cross-sectional view of a conventional refrigerating machine motor in a direction perpendicular to the rotation axis.

[Explanation of symbols]

6 Refrigeration machine motor 8 Stator assembly 10 Stator core 11 Stator coil 18 Lead line 22 Magnetic pole 23 Sleeve

Claims (2)

[Claims] Claim 1: In a motor for a refrigeration machine in which a lead wire connecting a stator coil and an external power source comes into direct contact with a refrigerant, an end of a magnet wire constituting the stator coil is extended to the outside of the motor where it does not come into contact with the refrigerant; A motor for a refrigeration machine, characterized in that the lead wire is formed by covering a magnet wire extending from a stator coil with a sleeve knitted with an insulating fiber that does not deteriorate in a refrigerant for a long time. 2. The motor for a refrigeration machine according to claim 1, wherein the sleeve surface of the lead wire is coated with an adhesive or adhesive that does not deteriorate for a long time in a refrigerant.