JP2013146157A - Electric motor and electric compressor using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric motor capable of preventing damage of a lead wire due to contact with a rotator and the like, and restraining complication of a structure and increase of costs without a need of an extra component.SOLUTION: An electric motor 4 is provided with a stator 6 in which a coil part 13 is formed by a coil 12 wound around a stator iron core 10 via an insulation bobbin 11 and a lead wire 14 connected to a sealed terminal extends from the coil part 13. A guide part 15 restraining movement of the lead wire 14 toward the stator 7 is integrally provided on the insulation bobbin 11.

Description

  The present invention relates to an electric motor (hermetic motor) used for an electric compressor and an electric compressor using the same.

  In so-called hermetic motors used in electric compressors and the like, externally through a sealed terminal installed through the motor housing case with respect to the stator winding of the electric motor built in the motor housing case Power is being supplied. For this reason, in the motor housing case, it is necessary to connect and wire the lead wire extended from the coil portion of the stator formed by winding the winding to the sealing terminal. After this lead wire is connected to the sealed terminal, a part of the lead wire is in a free state between the stator end and the case, and the free portion comes into contact with the rotor and the like, causing damage to the lead wire coating and short circuit. May occur.

  Therefore, a lead wire is bound to an insulating member such as a bobbin on the stator side using a binding member, or as shown in Patent Document 1, a holding member for holding the lead wire is provided. There are provided those that are detachably installed at the axial end of the stator via a lock mechanism.

JP 2007-181332 A

  However, the method of binding lead wires using a binding member has problems such as poor workability and greatly reduced assembly. Moreover, as shown in Patent Document 1, a holding member for holding a lead wire that is detachably installed at the end of the stator via a locking mechanism requires a holding member and a locking mechanism, which increases the number of parts. However, there is a problem that the configuration is complicated and the cost is unavoidable.

  The present invention has been made in view of such circumstances, can prevent damage due to contact of the lead wire with the rotor, etc., and does not require extra parts, making the configuration complicated or An object is to provide an electric motor capable of suppressing an increase in cost and an electric compressor using the electric motor.

In order to solve the above-described problems, the electric motor of the present invention and the electric compressor using the same employ the following means.
That is, in the electric motor according to the present invention, a coil portion is formed by a winding wound around a stator core via an insulating bobbin, and a lead wire connected to the sealing terminal is extended from the coil portion. In the electric motor provided with the stator, the insulating bobbin is integrally provided with a guide portion for restricting the movement of the lead wire to the rotor side.

  According to the present invention, the insulating bobbin that winds the winding to form the coil portion is integrally provided with the guide portion that restricts the movement of the lead wire to the rotor side, so it is connected to the sealed terminal. Even if the lead wire to be moved becomes free between the stator end face and the motor housing case, the movement of the free portion toward the rotor is restricted by the guide part integrally provided on the insulating bobbin. be able to. Therefore, it is possible to prevent a situation where a free portion of the lead wire is damaged by contact with the rotor or the like and a malfunction such as a short circuit occurs. Further, since the guide portion is integrated with the insulating bobbin, it is not necessary to add extra parts, and the complexity of the structure and the increase in cost can be suppressed.

  Furthermore, the electric motor of the present invention is characterized in that, in the above-mentioned electric motor, the guide portion is extended outward in the axial direction from a tooth portion of the insulating bobbin.

  According to the present invention, since the guide portion is extended outward in the axial direction from the tooth portion of the insulating bobbin, the lead wire is connected to the inner peripheral side by the portion extended outward in the axial direction of the guide portion. It is possible to prevent movement to a position in contact with the rotor or the like located at the position. Therefore, it is possible to prevent damage caused by contact of the free part of the lead wire with the rotor or the like, and reliably prevent occurrence of a short circuit or the like.

  Furthermore, the electric motor of the present invention is the above-described electric motor, wherein the guide portion is extended to a position close to an end surface of the case that seals one end of the motor housing case, and the lead wire passes through the gap. It is characterized by being impossible.

  According to the present invention, the guide portion is extended to a position close to the end surface of the case that seals one end of the motor housing case, and the lead wire cannot pass through the gap. Even if it moves to a position where it is disengaged, the lead wire does not move to the rotor side through the gap between the tip of the guide portion and the end surface of the case. It can be reliably blocked and lead wire damage can be prevented.

  Furthermore, in the electric motor of the present invention, in any one of the above-described electric motors, the guide portion is provided on at least one of the insulating bobbins provided in a range where the lead wire is crossed. It is characterized by that.

  According to the present invention, since the guide portion is provided on at least one insulating bobbin provided in a range where the lead wire is crossed, the guide portion is provided on all of the plurality of insulating bobbins provided. It is not necessary to provide the guide wire, and by providing the guide portion with respect to at least one insulating bobbin provided in a range where the lead wire is wired, the movement of the lead wire to the rotor side can be restricted. Therefore, structural changes can be minimized and damage due to contact between the lead wire and the rotor can be easily prevented.

  Furthermore, an electric compressor according to the present invention is an electric compressor in which a compression mechanism and an electric motor are integrally coupled in a sealed case, and the electric motor is one of the above-described ones. It is characterized by being an electric motor.

  According to the present invention, in the electric compressor in which the compression mechanism and the electric motor are integrally coupled in the sealed case, the electric motor is any one of the above-described electric motors. Therefore, it is possible to prevent damage due to contact of the lead wire for supplying electric power from the outside to the stator of the electric motor through the sealed terminal that penetrates the case and the rotor. Therefore, the quality and reliability of the electric compressor can be improved.

  According to the electric motor of the present invention, even if the lead wire connected to the sealing terminal becomes free between the stator end face and the motor housing case, the movement of the free portion toward the rotor is insulated. Therefore, it is possible to prevent a situation in which a free portion of the lead wire is damaged by contact with a rotor or the like and a short circuit or the like occurs. Further, since the guide portion is integrated with the insulating bobbin, it is not necessary to add extra parts, and the complexity of the structure and the increase in cost can be suppressed.

  According to the electric compressor of the present invention, it is possible to prevent damage caused by contact of the lead wire for supplying electric power from the outside to the stator of the electric motor through the sealed terminal that penetrates the case and the rotor. Therefore, the quality and reliability of the electric compressor can be improved.

It is a longitudinal cross-sectional view of the part in which the electric motor of the electric compressor which concerns on one Embodiment of this invention is incorporated. FIG. 2 is a left side view of the electric motor shown in FIG. 1 with windings omitted. FIG. 3 is a right side view of the electric motor shown in FIG. 2.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3.
FIG. 1 shows a longitudinal sectional view of a portion in which an electric motor of an electric compressor according to an embodiment of the present invention is built, FIG. 2 shows a left side view thereof, and FIG. FIG. 2 is a right side view of FIG.
The electric compressor 1 is a case in which a motor housing case 2, a compressor case (not shown) coupled to the right side of the motor housing case 2 and a lower case 3 coupled to the left side of the motor housing case 2 are integrally coupled. The electric motor 4 and a compression mechanism (not shown) that is driven by the electric motor 4 are incorporated therein.

The compression mechanism may be any type of compression mechanism as long as it is driven by the electric motor 4 via the rotating shaft 5, and the description of the specific configuration is omitted here.
The electric motor 4 is composed of a stator 6 and a rotor 7, and the stator 6 is fixedly installed in the motor housing case 2 via bolts 8 and the like. The rotor 7 is rotatably supported via the rotary shaft 5 with a certain gap on the inner peripheral side of the stator 6.

  One end of the rotary shaft 5 is rotatably supported by a bearing 9 provided on the lower case 3 side, and the other end side is rotatably supported via a bearing (not shown) provided on the compression mechanism side. It has come to be. On the other end side of the rotary shaft 5, there is provided a drive unit for the compression mechanism, which is connected to the compression mechanism via the drive unit, and is configured to be driven by the rotation of the electric motor 4. ing.

  The stator 6 of the electric motor 4 includes a stator core 10 formed by laminating a predetermined number of annular plate materials formed by punching electromagnetic steel sheets into a predetermined shape and integrally connecting them by caulking, welding, or the like. It has. On the inner peripheral surface side of the stator core 10, slots serving as winding spaces are provided at a plurality of locations at equal intervals on the circumference, and teeth portions are formed at a plurality of locations between the slots. ing. A plurality of teeth portions of the stator core 10 are wound with U, V, and W phase three-phase stator windings (windings) 12 through resin-made insulating bobbins 11, respectively. A coil portion 13 is formed.

  One end side of the three-phase stator winding 12 forming the coil portion 13 is extended from the coil portion 13 as a lead wire 14, and the other end side is star-connected at a neutral point. A lead wire 14 extending from the coil portion 13 is a coil formed by being wound around an insulating bobbin 11 in a space formed between the inner end surface of the lower case 3 and one end surface of the stator 6. Along the outer side of the portion 13, wiring is performed so as to be connected to a sealing terminal penetratingly installed at an appropriate position of the lower case 3 or the motor housing case 2.

  The lead wire 14 has a margin for connecting and wiring to the sealed terminal, and that portion is free in the space between the inner end surface of the lower case 3 and one end surface of the stator 6, and rotates. There is a risk of falling to the child 7 side. Therefore, in the present embodiment, in order to restrict the movement of the portion of the lead wire 14 in the free state toward the rotor, the tooth portion 11A of the insulating bobbin 11 around which the stator winding 12 is wound is used. The guide portion 15 is integrally formed so as to extend outward in the axial direction.

  As shown in FIG. 1, the guide portion 15 extends to a position close to the inner end surface of the lower case 3, and by making the gap sufficiently small, the lead wire 14 cannot pass through the gap, and the lead wire 14 passes through the gap. Does not fall into the rotor 7 side. Further, since the guide portion 15 is wired along the outside of the coil portion 13 by the stator winding 12 in which the lead wire 14 is wound around the insulating bobbin 11, the insulating bobbin 11 in the range where the crossover wiring is performed. Need not be provided for all of the plurality of insulating bobbins 11.

  In the present embodiment, as shown in FIG. 2, an example in which the guide portion 15 is provided only on one insulating bobbin 11 is shown, but the range in which the lead wire 14 is crossed has a plurality of insulating properties. When straddling the bobbin 11, the guide portions 15 may be provided on the plurality of insulating bobbins 11 so as not to fall into the rotor 7 side.

With the configuration described above, according to the present embodiment, the following operational effects are obtained.
In the electric compressor 1, the electric motor 4 is incorporated in the motor housing case 2 and is connected to the compression mechanism incorporated in the compressor case via the rotary shaft 5 to drive the compression mechanism. From the stator 6 side of the electric motor 4, a lead wire 14 is extended along the outside of the coil portion 13 wound around the insulating bobbin 11, and the lead wire 14 is connected to a sealing terminal (not shown). Thus, electric power from the outside is supplied to the stator 6 of the electric motor 4 built in the inside through a sealed terminal that penetrates the case.

  Since the lead wire 14 is connected and wired to the sealed terminal, the lead wire 14 has a certain margin length. After that portion is connected to the sealed terminal, the space between the inner end face of the lower case 3 and one end face of the stator 6 is provided. In a free state. However, the movement and depression of the free portion of the lead wire 14 toward the rotor 7 can be restricted by the guide portion 15 extending outward in the axial direction from the tooth portion 11A of the insulating bobbin 11.

  As a result, it is possible to prevent a situation in which a free portion of the lead wire 14 comes into contact with the rotor 7 or the like, damages such as damage to the coating, and short circuit or the like occur. Moreover, since the guide part 15 is integrally formed with the tooth part 11A of the insulating bobbin 11, it is not necessary to add extra parts, and the complexity of the structure and the cost increase can be suppressed.

  In particular, the guide portion 15 is extended to a position close to the inner end surface of the lower case 3 that seals one end of the motor housing case 2, and the gap is made sufficiently small to prevent passage of the lead wire 14. . For this reason, even if the lead wire 14 moves to a position where the lead wire 14 is disengaged from the guide portion 15, the lead wire 14 falls toward the rotor 7 through the gap between the tip of the guide portion 15 and the inner end surface of the lower case 3. In this way, contact between the lead wire 14 and the rotor 7 or the like can be reliably prevented, and damage to the lead wire 14 can be prevented.

  Moreover, the guide part 15 should just be provided with respect to the at least 1 insulating bobbin 11 arrange | positioned in the range where the lead wire 14 is wired, and all the insulating bobbins 11 provided with two or more are provided. There is no need to provide the guide portion 15. In other words, by providing the guide portion 15 with respect to at least one insulating bobbin 11 disposed corresponding to the range in which the lead wires 14 are wired among the plurality of insulating bobbins 11, the lead The movement of the line 15 toward the rotor 7 can be restricted. Therefore, structural changes can be minimized and damage due to contact between the lead wire 14 and the rotor 7 can be easily prevented.

  Furthermore, in the electric compressor 1 in which the compression mechanism and the electric motor 4 are integrally coupled inside the sealed cases 2 and 3 as in the present embodiment, the electric motor 4 is As described above, the electric motor 4 is integrally provided with the guide portion 15 for restricting the movement of the lead wire 14 on the insulating bobbin 11 on the stator 6 side, and through the sealed terminal penetrating the cases 2, 3 and the like. Since the lead wire 14 for supplying electric power from the outside to the stator 6 of the electric motor 4 prevents damage due to contact with the rotor 7 or the like, the quality and reliability of the electric compressor 1 are improved. can do.

  In addition, this invention is not limited to the invention concerning the said embodiment, In the range which does not deviate from the summary, it can change suitably. For example, in the above embodiment, the damage due to the contact between the rotor 7 and the lead wire 14 has been described. However, a balance weight or the like may be attached to the end surface of the rotor 7. Of course, contact with the attachment is also prevented.

  Further, from the viewpoint of formability, it is desirable for the guide portion 15 to have a structure in which the teeth portion 11A of the insulating bobbin 11 is extended outward in the axial direction as it is, and is integrally formed. If there is not, it is good also as a structure which provided the processus | protrusion etc. to the radial direction outer side at the front-end | tip. Furthermore, the cross-section of the guide portion 15 can be various shapes such as a circle and a rectangle. In order to form the support surface of the lead wire 14, it is desirable that the guide portion 15 has a rectangular cross-section with a predetermined width.

1 Electric compressor 2 Motor housing case (case)
3 Lower case (case)
4 Electric Motor 6 Stator 7 Rotor 10 Stator Core 11 Insulating Bobbin 11A Teeth 12 Stator Winding (Winding)
13 Coil part 14 Lead wire 15 Guide part

Claims (5)

In an electric motor including a stator in which a coil portion is formed by a winding wound around a stator iron core via an insulating bobbin, and a lead wire connected to a sealing terminal is extended from the coil portion.
An electric motor characterized in that a guide portion for restricting movement of the lead wire to the rotor side is integrally provided on the insulating bobbin.   The electric motor according to claim 1, wherein the guide portion is extended outward in the axial direction from a tooth portion of the insulating bobbin.   The said guide part is extended to the position close | similar to the end surface of the case which seals one end of a motor accommodation case, and the said lead wire cannot pass through the clearance gap. Electric motor.   The electric motor according to any one of claims 1 to 3, wherein the guide portion is provided on at least one of the insulating bobbins provided in a range in which the lead wires are crossed. . In an electric compressor that is built in a state where a compression mechanism and an electric motor are integrally coupled in a sealed case,
An electric compressor, wherein the electric motor is the electric motor according to any one of claims 1 to 4.

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