WO2016174768A1 - Rotary motor and compressor - Google Patents

Abstract

The rotary motor installed in the compressor has a spindle, a rotor through which the spindle is inserted, and a stator that is annularly disposed on the outer peripheral side of the rotor. The stator has a core that is formed by laminating multiple electromagnetic steel plates, insulators that are respectively disposed on one end and the other end in the axial direction of the core, and a coil that is formed by winding a conductive wire between the insulator on the one end and the insulator on the other end via the core. Each of the insulators has a winding part around which the conductive wire is radially wound and an outer wall part that is disposed on the outer diameter side of the winding part, with the inner surface thereof being tilted toward the outer diameter side by a preset tilt angle with respect to the axial direction in a pre-winding state.

Description

Rotating motor and compressor

The present invention relates to a rotary motor and a compressor having a stator having a core made of laminated steel plates.

In recent years, as a rotating motor, a direct-winding motor of a brushless DC motor is often used for miniaturization and high performance. The rotary electric motor has a stator having a core made of laminated steel plates on the outer peripheral side of the rotor into which the main shaft is inserted. Compressors that use a rotary motor as a power source are increasingly required to improve reliability from the viewpoints of higher performance, enhanced heat resistance, and enhanced oil and refrigerant resistance against refrigeration oil and refrigerant. Yes. It is generally known that improving the coil space factor is effective for improving the reliability of the compressor. As a method for improving the space factor, there is known an aligned winding in which conducting wires constituting a coil are regularly aligned on an insulator and wound (see, for example, Patent Documents 1 to 4).

When performing aligned winding, it is important to accurately control the movement of the conducting wire and the laminated steel plate rotating at high speed in order to ensure productivity. Patent Document 1 discloses a winding method in which a guide groove serving as a winding guide is provided in an insulator to restrict the movement of a conducting wire. Patent Document 2 discloses a method of winding a conductive wire around a stator core.

Further, the insulator described in Patent Document 3 is provided with a concave portion on a surface facing the core of the protruding portion protruding toward the inner diameter side, so that the inner wall portion formed at the inner diameter side end portion of the protruding portion is It is configured to tilt toward the outer diameter side. Further, as in Patent Document 4, by adjusting the tension at the time of winding, the contact force between the conducting wire in the winding and the insulator is suppressed, and the damage to the insulating coating of the conducting wire is reduced. A technique for improving the performance is also known.

JP 2006-115565 A Japanese Patent No. 478888 JP 2013-162619 A JP 2010-200396 A

By the way, since the core of the stator is made of laminated steel plates as described above, the tightening that causes the core thickness to shrink in the axial direction occurs due to the tension applied during the winding of the coil. However, in the configurations described in Patent Documents 1 to 4, the outer wall portion of the insulator is inclined to the inner diameter side from the plane orthogonal to the radial direction following the change in the core thickness due to the tightening. Therefore, when the conducting wire constituting the coil is wound around the outer wall portion, the conducting wire collides with or comes into contact with the outer wall portion, and the situation where the aligned winding is hindered or the insulating coating of the conducting wire is damaged occurs. For this reason, it is desired to suppress the outer wall portion of the insulator from obstructing the winding of the coil.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a rotary motor and a compressor that suppress an outer wall portion of an insulator from interfering with a coil winding.

A rotary electric motor according to the present invention has a main shaft, a rotor into which the main shaft is inserted, and a stator provided in an annular shape on the outer peripheral side of the rotor, and the stator is formed by laminating a plurality of electromagnetic steel plates. Formed in the core, insulators provided at one end and the other end in the axial direction of the core, and a conductive wire wound between the insulator at one end and the insulator at the other end via the core. Each insulator is provided on the outer diameter side of the winding portion in which the conductive wire is wound in the radial direction, and in the state before being wound, the inner surface is in the axial direction. And an outer wall portion inclined by an outer inclination angle set to the outer diameter side.

According to the present invention, since the plurality of insulators have the outer wall portion inclined by the preset outer inclination angle from the axial direction to the outer diameter side in front of the winding, the thickness of the core due to the tightening of the insulator is increased. Even if the outer wall portion is inclined toward the inner diameter side following the change, the outer wall portion is inclined toward the outer diameter side by an amount corresponding to the outer inclination angle, so that the outer wall portion of the insulator can be prevented from interfering with the winding of the coil.

It is a longitudinal cross-sectional view which shows typically the compressor which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional view which shows typically the rotary electric motor which the compressor of FIG. 1 has. FIG. 3 is a transverse sectional view taken along the line AA in FIG. 2. It is a longitudinal cross-sectional view which shows typically the state before winding among the structures of the stator which the rotary electric motor of FIG. 1 has. It is a longitudinal cross-sectional view which shows typically the state after winding among the structures of the stator which the rotary electric motor of FIG. 1 has. It is a longitudinal cross-sectional view which shows typically the state before winding among the structures of the stator which the compressor which concerns on Embodiment 2 of this invention encloses. It is a longitudinal cross-sectional view which shows typically the state after winding among the structures of the stator which the compressor which concerns on Embodiment 2 of this invention encloses. It is a longitudinal cross-sectional view which shows typically the state before winding among the structures of the stator which the compressor which concerns on Embodiment 3 of this invention encloses. It is a longitudinal cross-sectional view which shows typically the state after winding among the structures of the stator which the compressor which concerns on Embodiment 3 of this invention encloses. It is a longitudinal cross-sectional view which shows typically the state before winding among the structures of the stator which the compressor which concerns on Embodiment 4 of this invention encloses. It is a longitudinal cross-sectional view which shows typically the state after winding among the structures of the stator which the compressor which concerns on Embodiment 4 of this invention encloses. It is a longitudinal cross-sectional view which shows typically the state before winding among the structures of the stator which the compressor which concerns on Embodiment 5 of this invention encloses. It is a longitudinal cross-sectional view which shows typically the state after winding among the structures of the stator which the compressor which concerns on Embodiment 5 of this invention encloses. It is a longitudinal cross-sectional view which shows typically the state before winding among the structures of the stator which the conventional compressor includes. It is a longitudinal cross-sectional view which shows typically the state after winding among the structures of the stator which the conventional compressor includes. It is a longitudinal cross-sectional view for demonstrating the subject regarding the inner wall part and outer wall part of the rotor of FIG. FIG. 16 is a longitudinal sectional view for explaining a problem related to a winding portion of the rotor of FIG. 15.

[Embodiment 1]
FIG. 1 is a longitudinal sectional view schematically showing a compressor according to the first embodiment. The compressor 10 is composed of, for example, a scroll compressor, and is one of components of a refrigeration cycle used in various industrial machines such as a refrigerator, a freezer, an air conditioner, a refrigeration measure, and a water heater. The compressor 10 sucks the refrigerant circulating in the refrigeration cycle, compresses it, and discharges it as a high-temperature and high-pressure state.

As shown in FIG. 1, the compressor 10 includes a sealed container 20 constituting an outer shell, a suction pipe 30 that sucks refrigerant gas into the sealed container 20, and a discharge pipe 40 that discharges compressed refrigerant gas. Yes. The compressor 10 includes a compression mechanism 50 that compresses refrigerant in the sealed container 20, a rotary electric motor 60 that drives the compression mechanism 50 by rotating the main shaft 21, and an end of the main shaft 21 on the rotary electric motor 60 side. And an oil pump 22 immersed in the lubricating oil 22a. The sealed container 20 is formed of a sealed shell or casing and houses the compression mechanism unit 50 and the rotary motor 60. The main shaft 21 is rotationally driven by the rotary electric motor 60.

The compression mechanism unit 50 includes a fixed scroll 51 provided with a fixed spiral body 51a and a swing scroll 52 provided with a swing spiral body 52a. The rotary electric motor 60 includes a rotor 61 into which the main shaft 21 is inserted, and a stator 70 provided in an annular shape on the outer peripheral side of the rotor 61. The stator 70 includes a core 71 formed by laminating a plurality of electromagnetic steel plates, insulators 80 provided at one end and the other end in the axial direction of the core 71, an insulator 80 having one end of the conductive wire, and an insulator at the other end. 80, and a coil 72 formed by being wound through a core 71 between the two. The core 71 is a laminated steel plate, and is configured by laminating a plurality of electromagnetic steel plates. The conducting wire constituting the coil 72 is made of, for example, a magnet wire, and the surface thereof is covered with an insulating film (not shown).

The compressor 10 has a sealed terminal 24 that is welded to the sealed container 20, takes the lead wire 23 from the stator 70 of the rotary electric motor 60 to the outside of the sealed container 20, and is electrically connected to an external power source. ing. In FIG. 1, as the compressor 10, a vertical type hermetic scroll compressor is illustrated, but a horizontal type may be adopted. Further, as the compressor 10, a vane type compressor may be adopted.

Next, the operation of the compressor 10 will be described. When the sealed terminal 24 is energized, the stator 70 and the rotor 61 generate torque, and the main shaft 21 rotates. When the main shaft 21 rotates, the orbiting scroll 52 coupled to the main shaft 21 starts to rotate and cooperates with the fixed scroll 51 to start compressing the refrigerant gas. At that time, the refrigerant gas is sucked from the suction pipe 30 and flows into the sealed container 20, and is sucked and compressed into the compression mechanism portion 50 formed by the fixed scroll 51 and the swing scroll 52, and then the discharge pipe. The refrigerant is discharged to the refrigerant circuit outside the sealed container 20 through 40. Further, when the main shaft 21 rotates, the oil pump 22 is driven to suck the lubricating oil 22a, and the lubricating oil is supplied to the bearings and the like through the oil supply passage 21a provided in the main shaft 21 and then lubricated. Return to the bottom of 20.

Next, with reference to FIG. 2 and FIG. 3, the rotor 61 and the stator 70 which comprise the rotary electric motor 60 are demonstrated in detail. FIG. 2 is a longitudinal sectional view schematically showing the rotary electric motor 60 included in the compressor 10. FIG. 3 is a cross-sectional view taken along line AA in FIG. The stator 70 has an annular core 71 on which electromagnetic steel plates made of a high permeability material such as iron are laminated. The core 71 has an annular back yoke portion 71a and a plurality of teeth portions 71b protruding from the back yoke portion 71a to the inner diameter side. The plurality of tooth portions 71b are arranged along the circumferential direction. Resin-molded insulators 80 are respectively disposed at one end and the other end of the tooth portion 71b in the axial direction. A coil 72 is wound around the insulator 80, and a lead wire 23 serving as a connection line with a power source is connected to the coil 72. The coil 72 is wound around the teeth portion 71b via a winding portion 81 (see FIG. 4) of the insulator 80.

The rotor 61 includes a boss 61a in which steel plates made of a high permeability material such as iron are laminated, and magnet insertion holes 61b provided in the circumferential direction by the number corresponding to the magnetic poles along the outer periphery of the boss 61a. A permanent magnet 61c embedded in the magnet insertion hole 61b and constituting the magnetic pole of the field of the rotary electric motor 60, and end plates 61d made of a non-magnetic material and provided at both ends in the axial direction of the boss 61a. Have. The rotor 61 includes a balance weight 61e disposed on the end plate 61d at one end or both ends in the axial direction of the boss 61a, and a rivet 61f that passes through the boss 61a, the end plate 61d, and the balance weight 61e. ,have. That is, in the rotor 61, the end plate 61d, the boss 61a, and the balance weight 61e are fastened by the rivet 61f.

Next, the configuration of the insulator 80 will be described in detail with reference to FIGS. 4 and 5. FIG. 4 is a longitudinal sectional view schematically showing a state before winding in the structure of the stator 70 included in the rotary electric motor 60. The insulator 80 insulates the coil 72 from the tooth portion 71b, and has a winding portion (insulator tooth portion) 81 around which a conducting wire constituting the coil 72 is wound in the radial direction. Further, the insulator 80 is provided with an inner wall portion 82 and an outer wall portion 83 extending in a direction away from the core 71 on the inner diameter side and the outer diameter side of the tooth portion 71b, respectively. In the first embodiment, the winding part 81 and the inner wall part 82 are in contact with each other, and the winding part 81 and the outer wall part 83 are also in contact with each other.

The inner wall portion 82 prevents the coil 73 from collapsing toward the inner diameter side, and the outer wall portion 83 prevents the coil 73 from collapsing toward the outer diameter side. Therefore, the height in the axial direction is higher in the inner wall portion 82 and the outer wall portion 83 than in the winding portion 81. Moreover, as for the height of the inner wall part 82 and the outer wall part 83, generally, there are many that set the outer wall part 83 higher than the inner wall part 82, and FIG. 4 and FIG. However, it is not limited to this. That is, for example, the inner wall portion 82 and the outer wall portion 83 may be set to the same height, and the inner wall portion 82 may be set higher than the outer wall portion 83. The outer wall portion 83 is provided on the outer diameter side of the winding portion 81 and is inclined by an outer inclination angle θ _o set in advance toward the outer diameter side with respect to the axial direction in a state before winding (before winding). It is a thing. That is, the outer wall portion 83 is inclined by the outer inclination angle θ _{o with} respect to the plane S orthogonal to the radial direction. The outer inclination angle θ _o is configured to be equal to or larger than a reference inclination angle θ _MAX calculated based on the thickness and number of stacked cores 71 and the outer diameter and inner diameter of the stator 70.

FIG. 5 is a longitudinal sectional view schematically showing a state after winding in the structure of the stator 70 included in the rotary electric motor 60. The core 71 after being wound decreases in thickness as it goes to the inner diameter side due to tightening at the time of winding, and a plane T (contact surface between the core 71 and the insulator 80 before winding) perpendicular to the axial direction. Is inclined at an angle θ.

Here, the inclination angle θ and the reference inclination angle θ _MAX will be described. Since the amount of winding of the core 71 does not exceed the total sum of the gaps between the cores 71 made of laminated steel sheets, the reference inclination angle θ _MAX that is the maximum value of the inclination angle θ is obtained by the following formula 1. Can do.

In the above formula 1, H [mm] is the thickness of the core 71 which is a laminated steel plate. X [sheets] is the number of laminated magnetic steel sheets constituting the core 71. δ [mm] is a gap (lamination gap) between laminated electromagnetic steel sheets. φ _O [mm] is the outer diameter of the stator 70, and φ _i [mm] is the inner diameter of the stator 70. The outer inclination angle θ _o of the first embodiment is set so that the reference inclination angle θ _MAX obtained by Equation 1 is a lower limit value in order to avoid contact between the conductors constituting the coil 72 and the insulator 80 (θ _o ≧ θ _MAX ). The inclination angle θ is equal to or less than the reference inclination angle θ _MAX (θ ≦ θ _MAX ).

When the core 71 is inclined by the inclination angle θ by tightening, the outer wall portion 83 also follows the inclination of the core 71 and is inclined toward the inner diameter side by the inclination angle θ. However, since the outer wall portion 83 in the first embodiment has a shape having an inclination of the outer inclination angle θ _o that is equal to or _larger than the reference inclination angle θ _MAX on the outer diameter side before winding, The outer wall portion 83 is not located at the bottom. That is, as shown in FIG. 5, the angle formed by the plane T perpendicular to the axial direction and the side surface (inner surface) on the inner diameter side of the outer wall 83 is 90 degrees or less. For this reason, it is possible to avoid the conductive wire wound in the vicinity of the outer wall portion 83 from coming into contact with the outer wall portion 83 during winding by aligned winding.

As described above, the rotary motor 60, a plurality of insulators 80, before the winding, has an outer wall portion 83 which is inclined radially outward by the outer inclination angle theta _o with respect to the axial direction. For this reason, even if the insulator 80 is inclined toward the inner diameter side following the change in the core thickness due to the tightening, the outer wall portion 83 is inclined toward the outer diameter side by the outer inclination angle θ _o. Can prevent the winding of the coil 72 from being obstructed. Therefore, according to the rotary electric motor 60, it is possible to avoid winding disturbance and damage to the insulating film on the surface of the conductive wire caused by the collision between the conductive wire wound around the winding portion 81 and the outer wall portion 83.

That is, according to the rotary motor 60 and the compressor 10, since highly accurate aligned winding can be realized, the motor efficiency can be improved. Moreover, since the conducting wire and the outer wall 83 do not contact each other, the winding speed can be increased, so that productivity can be improved. Furthermore, since it is possible to suppress the manufacturing deterioration of the insulating film of the conductive wire, it is possible to improve the reliability.

In the compressor 10 equipped with the rotary electric motor 60, the temperature environment in the compressor 10 is affected by the refrigerant gas or the heat generated by the stator 70, and the like. For this reason, depending on the operating conditions, the temperature in the compressor 10 is −50 ° C. to 150 ° C. Therefore, it is necessary to ensure reliability in a wide temperature range. As for the conductive wire of the coil 72 covered with an insulating film mainly composed of a resin material, it is essential to ensure reliability particularly at high temperatures, and damage to the insulating film during winding must be avoided.

In particular, due to recent refrigerant trends, a mixed refrigerant containing HFO-1123, such as HFC-32 refrigerant, which has a higher temperature and pressure rise during compression than the conventionally used R410A, R407C, R404A refrigerants, etc. is used. When doing so, it is required to cope with the temperature rise in the compressor 10, and it is required to improve the motor efficiency by high-precision aligned winding and to improve the reliability by reducing the damage of the insulating coating during winding.

In this regard, in the rotary electric motor 60 and the compressor 10 according to the first embodiment, the outer wall portion 83 is inclined in advance by the outer inclination angle θ _o in consideration of the deformation of the core 71 due to the winding. Therefore, the motor efficiency can be improved. Moreover, since the damage of the insulating film at the time of winding can be prevented, the reliability is improved. Therefore, the compressor 10 can use a single refrigerant made of HFO-1123, a mixed refrigerant containing HFO-1123, or the like as the refrigerant circulating in the refrigeration cycle.

By the way, in the example of FIG.4 and FIG.5, although the whole outer wall part 83 is comprised so that the outer inclination angle (theta) _o may be made, only the side surface (contact surface with the coil 72) of the inner diameter side of the outer wall part 83 is. You may comprise so that the outer inclination | tilt angle (theta) _o may be made. That is, the cross section of the outer wall 83 may be tapered, for example. Further, the side surface on the inner diameter side of the outer wall portion 83 may be a curved surface warped toward the outer diameter side. Even if each said structure is taken, the contact with the conducting wire which comprises the coil 72, and the insulator 80 can be prevented.

Further, a side of the inner diameter side of the outer wall 83, and only a portion of collision with lead constituting the coil 72 may be configured so as to form an outer inclination angle theta _o. That is, for example, the tip portion of the outer wall portion 83 and the contact portion of the coil 72 may have different inclination angles, and the inner wall side and outer side surface of the outer wall portion 83 may be curved. Good. Even if it does in this way, the collision with a conducting wire and the insulator 80 can be prevented. However, the thickness of the outer wall portion 83 needs to be set in consideration of the strength that can withstand the tension at the time of winding, the releasability at the time of molding, and burning.

[Embodiment 2]
Next, the rotary electric motor according to the second embodiment will be described with reference to FIGS. 6 and 7 are longitudinal sectional views schematically showing the state before and after winding in the structure of the stator included in the compressor according to the second embodiment. The same constituent members as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

The insulator 180 according to the second embodiment is provided on the inner diameter side of the winding portion 181 on which the conducting wire constituting the coil 72 is wound, and on the outer diameter side with respect to the axial direction before the winding. The inner wall portion 182 is inclined by a preset inner inclination angle θ _i and the outer diameter side of the winding portion 181 and is inclined by the outer inclination angle θ _{o with} respect to the plane S orthogonal to the radial direction. And an outer wall portion 83. The inner surface of the inner wall portion 182 has an inner inner lower edge portion 182a located on the core 71 side, and an inner inner tip portion 182b located at the tip.

The inner inclination angle θ _i of the inner wall portion 182 is set such that the avoidance angle θd that can avoid contact with the rotor 61 is a lower limit, and the reference inclination angle θ _MAX obtained by the above equation 1 is the upper limit (θd ≦ θ _i ≦ θ _MAX ). When the inner inclination angle θ _i is set with the reference inclination angle θ _MAX as the lower limit (θ _i > θ _MAX ), the inner wall portion 182 is placed on the rotation trajectory of the conducting wire wound in the vicinity thereof. Since it protrudes, the collision between the conductor and the insulator 180 cannot be avoided.

The avoidance angle θd that can avoid contact with the rotor 61 is an inner wall inner diameter inclination that is a radial distance between the inner inner lower edge portion 182a and the inner inner tip portion 182b of the inner wall portion 182 before the winding. The amount Di may be set so that the distance between the rotor 61 and the inner inner lower edge 182a (shortest distance from the rotor 61) is D _min or more (D _min ≦ Di). With this setting, since the radial distance between the rotor 61 and the inner inner tip 182b after winding is 0 or more, the inner wall 182 is prevented from jumping out toward the inner diameter, Contact with the inner wall portion 182 can be avoided.

As described above, in the insulator 180 according to the second embodiment, the inner wall 182 is inclined in advance in the outer radial direction by the inner inclination angle θ _i before the winding, and the outer wall 83 is outer in the outer radial direction. I am inclined by inclination angle θ _o. For this reason, contact with the inner wall part 182 and the outer wall part 83, and the conducting wire wound around these can be avoided. That is, as shown in FIG. 7, the angle formed by the plane T orthogonal to the axial direction and the side surface on the outer diameter side of the inner wall portion 182 and the side surface on the inner diameter side of the outer wall portion 83 is 90 degrees or less. Further, since the insulator 180 is configured such that the inner wall inner diameter inclination amount Di is not less than the distance _Dmin between the rotor 61 and the inner inner lower edge portion 182a, contact between the rotor 61 and the inner wall portion 182 is avoided. can do.

Therefore, according to the rotary electric motor and the compressor according to the second embodiment, it is possible to achieve more accurate aligned winding, and thus it is possible to improve motor efficiency. Further, since the conducting wire does not contact the inner wall portion 182 and the outer wall portion 83, productivity can be improved by increasing the winding speed. And since manufacturing deterioration of the insulating film of a conducting wire can be suppressed, combined with the effect that the contact between the rotor 61 and the inner wall portion 182 can be avoided, reliability can be improved.

In the example of FIGS. 6 and 7, the entire inner wall portion 182 is configured to have an inner inclination angle θ _i , but the inclination of the side surface on the outer diameter side of the inner wall portion 182 and the inner diameter of the inner wall portion 182 are adopted. You may make it set separately the inclination of the side surface of a side. In other words, the inclination angle of the side surface on the inner diameter side of the inner wall portion 182 may be set so that the inner / inner tip portion 182b does not contact the rotor 61 after winding. Further, the inclination angle of the side surface on the outer diameter side of the inner wall portion 182 may be set so as to avoid contact with the conducting wire during winding within the range of θ _i <θ.

Moreover, you may comprise so that only the part which is the side surface by the side of the outer diameter of the inner wall part 182 and collides with the conducting wire which comprises the coil 72 makes inner inclination | tilt angle (theta) _i . That is, for example, the tip of the inner wall portion 182 and the contact portion of the coil 72 may have different inclination angles, and the inner wall side 182 may have curved surfaces on the inner diameter side and the outer diameter side. . Even if it does in this way, the collision with a conducting wire and the insulator 80 can be prevented, and the contact with the rotor 61 and the inner wall part 182 can be avoided. However, when configured as described above, the thickness of the inner wall portion 182 needs to be set in consideration of the strength that can withstand the tension at the time of winding, the releasability at the time of molding, and burning.

[Embodiment 3]
Next, the rotary electric motor according to the third embodiment will be described with reference to FIGS. FIGS. 8 and 9 are longitudinal sectional views schematically showing the state before and after the winding in the structure of the stator included in the compressor according to the third embodiment. The same components as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted.

The insulator 280 according to the third embodiment is provided on a winding portion 281 around which a conducting wire is wound and an inner diameter side of the winding portion 281, and before the winding, an inner inclination angle θ toward the outer diameter side with respect to the axial direction. an inner wall portion 182 inclined by _i, and an outer wall portion 83 provided on the outer diameter side of the winding portion 281 and inclined by an outer inclination angle θ _{o with} respect to the plane S orthogonal to the radial direction. Yes. The setting of the inner inclination angle θ _i of the inner wall portion 182 and the outer inclination angle θ _o of the outer wall portion 83 is the same as in the first and second embodiments.

In the third embodiment, the thickness of the winding portion 281 is configured to increase toward the inner diameter side. That is, the winding surface 281a in the axial direction of the winding portion 281 forms a winding surface inclination angle θt set in advance with respect to the plane T orthogonal to the axial direction. In the third embodiment, the winding surface inclination angle θt is set to be equal to the reference inclination angle θ _MAX so as not to generate a component force in the radial direction of the tension during winding (θt = θ _MAX ).

As described above, in the insulator 280 in the third embodiment, the inner wall 182 is inclined in the outer diameter direction by the inner inclination angle θ _i and the outer wall 83 is inclined in the outer diameter direction before the winding. Since it is inclined by the angle θ _o , it is possible to avoid contact between the inner wall portion 182 and the outer wall portion 83 and a conducting wire wound in the vicinity thereof. Further, since the insulator 280 is configured such that the inner wall inner diameter inclination amount Di is not less than the distance D _min between the rotor 61 and the inner inner lower edge portion 182a, contact between the rotor 61 and the inner wall portion 182 is also avoided. can do.

In the third embodiment, the winding surface 281a in the axial direction of the winding portion 281 forms a winding surface inclination angle θt with respect to the plane T perpendicular to the axial direction. For this reason, as shown in FIG. 9, after winding, the winding surface 281a can be configured to be parallel to a plane T perpendicular to the axial direction. That is, the winding portion 281 tilts following the contraction of the core 71 during winding, so that the winding surface tilt angle θt is canceled after winding, and the winding surface 281a is parallel to the plane T. It becomes. By the way, the amount of tightening during winding is stable when the first layer of the coil 72 is wound, and hardly changes when winding the second and subsequent layers. That is, when the first layer is wound, the winding surface 281a is almost parallel to the plane T. Therefore, according to the rotary electric motor of the third embodiment, the second and subsequent layers can be wound while the winding surface 281a is substantially parallel to the plane T. It is possible to prevent the force from being generated in the radial direction, and it is possible to prevent a situation in which the winding slips and collapses.

As described above, according to the rotary electric motor and the compressor in the third embodiment, it is possible to achieve more accurate aligned winding, and thus it is possible to improve motor efficiency. Further, since the conducting wire does not contact the inner wall portion 182 and the outer wall portion 83, productivity can be improved by increasing the winding speed. And since the manufacture deterioration of the insulating film of a conducting wire can be suppressed and the contact with the rotor 61 can also be avoided, the improvement of reliability can be aimed at. It should be noted that the thickness of the core 71 made of laminated steel sheets is not necessarily contracted by all the interlaminar gaps δ after winding, and it is also assumed that the outer diameter side of the core 71 contracts. Therefore, the winding surface inclination angle θt may be set to be smaller than the reference inclination angle θ _MAX by a preset constant angle.

[Embodiment 4]
Subsequently, the rotary electric motor according to the fourth embodiment will be described with reference to FIGS. 10 and 11. FIGS. 10 and 11 are longitudinal sectional views schematically showing the state before and after the winding in the structure of the stator included in the compressor according to the fourth embodiment. The rotating electric motor according to the fourth embodiment is characterized in that it is configured so as to satisfy the requirement of the aligned winding that the collision width between the insulator and the conducting wire at the time of winding is not more than half the wire diameter of the conducting wire. The same components as those in the first to third embodiments are denoted by the same reference numerals and the description thereof is omitted.

The insulator 380 of the fourth embodiment is provided on the winding portion 381 around which the conducting wire is wound, the inner wall portion 82 provided on the inner diameter side of the winding portion 381, and the outer diameter side of the winding portion 381. And an outer wall portion 383 that is inclined by a preset outer inclination angle θ _{o with} respect to the plane S orthogonal to the radial direction. The inner surface of the outer wall 83 has an outer inner lower edge 383a located on the core 71 side and an outer inner tip 383b located at the tip. The core 71 after the winding is reduced in thickness as it goes to the inner diameter side due to the influence of the tightening tension during winding, and forms an inclination angle θ with respect to the plane T perpendicular to the axial direction.

The outer inclination angle θ _o is less than a reference inclination angle θ _MAX (θo <θ _MAX ) calculated based on the thickness and number of stacked cores 71 and the outer diameter and inner diameter of the stator, and the winding The outer wall inner diameter inclination amount Do, which is the radial distance between the outer inner lower edge 383a and the outer inner tip 383b of the rear outer wall 383, is set to be equal to or less than the radius of the conducting wire.

Here, if the height of the side surface (contact surface with the coil 72) on the inner diameter side of the outer wall portion 383 is L 2 _O , the outer wall inner diameter inclination amount Do can be expressed as Lo × sin (θ−θo). That is, in the fourth embodiment, when the radius of the conducting wire is φm / 2, the outer inclination angle θ _o is set so that the relationship “Lo × sin (θ−θo) ≦ φm / 2” is established. Thus, the outer wall inner diameter inclination amount Do can be made equal to or smaller than the radius of the conducting wire. Therefore, since the collision width between the insulator and the winding at the time of winding can be suppressed to half or less of the wire diameter of the conducting wire, it is possible to improve the winding performance and ensure the reliability of the insulating coating of the conducting wire. it can.

[Embodiment 5]
Next, the rotary electric motor according to the fifth embodiment will be described with reference to FIGS. FIGS. 12 and 13 are longitudinal sectional views schematically showing a state before winding and a state after winding in the structure of the stator included in the compressor according to the fifth embodiment. The same components as those in the first to fourth embodiments are denoted by the same reference numerals and the description thereof is omitted.

The insulator 480 of the fifth embodiment is provided on the inner diameter side of the winding portion 481 and the winding portion 381 around which the conducting wire is wound, and is set in advance to the outer diameter side with respect to the axial direction before the winding. It has an inner wall portion 482 inclined by an inner inclination angle θ _i and an outer wall portion 83 provided on the outer diameter side of the winding portion 481. The outer surface of the inner wall 482 has an inner / outer lower edge 482a located on the core 71 side and an inner / outer tip 482b located at the tip. The core 71 after the winding is reduced in thickness as it goes to the inner diameter side due to the influence of the tightening tension during winding, and forms an inclination angle θ with respect to the plane T perpendicular to the axial direction.

The inner inclination angle θ _i is larger than the reference inclination angle θ _MAX calculated based on the thickness and number of stacked cores 71 and the outer diameter and inner diameter of the stator (θ _i > θ _MAX ), and The inner wall outer diameter inclination amount Dio, which is the radial distance between the inner and outer lower edge portions 482a and the inner and outer tip portions 482b of the inner wall portion 482 after winding, is set to be equal to or less than the radius of the conducting wire.

Here, when the height of the side surface of the outer diameter side of the inner wall portion 482 (contact surface with the coil 72) and _{L i,} the inner wall outer diameter tilt Dio, be expressed as _{L i × sin (θ i -θ} ) Can do. That is, in the fifth embodiment, the inner wall outer diameter inclination amount Dio is set by setting the inner inclination angle θ _i so that the relationship of “L _i × sin (θ _i −θ) ≦ φm / 2” is established. It can be made below the radius of a conducting wire. Therefore, since the collision width between the insulator and the winding at the time of winding can be suppressed to half or less of the wire diameter of the conducting wire, it is possible to improve the winding performance and ensure the reliability of the insulating coating of the conducting wire. it can.

(Effects of Embodiments 1 to 5)
Here, with reference to FIGS. 14 to 17, effects obtained by the rotary electric motor and the compressor in the first to fifth embodiments will be described in more detail. 14 and 15 are longitudinal sectional views schematically showing the state before and after the winding in the structure of the stator included in the conventional compressor, respectively. FIG. 16 is a longitudinal sectional view for explaining a problem related to the inner wall portion and the outer wall portion of the rotor of FIG. 15. FIG. 17 is a longitudinal sectional view for explaining a problem related to the winding portion of the rotor of FIG.

First, winding tightening will be explained. Since the core 71 made of laminated steel plates is configured by laminating a plurality of electromagnetic steel plates, a slight interlaminar gap δ is generated between the electromagnetic steel plates. At the time of winding, the tension applied to the conducting wire acts as an external force that compresses the core 71 in the axial direction, so that the interlaminate gap δ is narrowed, and the core 71 contracts with the total gap amount of the core 71 as the upper limit. This contraction is the tightening. In addition, since the coil 72 is applied only to the tooth portion 71b of the core 71, the winding amount increases from the back yoke portion 71a to the tip of the tooth portion 71b, so that the core 71 has a shape inclined in the inner diameter direction. Become. As described above, the tightening is characterized in that the amount of tightening is stable when the first layer is wound, and the second and subsequent layers are not substantially changed.

As a method for suppressing the tightening of the core 71, several round or V-shaped caulking portions are provided on the electrical steel sheet constituting the core 71, and pressure is applied with a press or the like during lamination, so that the radial direction And a method of fixing in both directions in the axial direction is known. However, even with such a method, it is difficult to reduce the tightening to zero because of the spring back after the pressure is released. Also known is a method of improving the crimping force by increasing the press-fitting allowance or the number of crimping parts, suppressing the springback, and reducing the gap between the stacks, but increasing the press-fitting allowance or number of the crimping parts. In such a case, there arises a problem that the axial eddy current generated in the laminated steel plate during driving of the rotary electric motor is increased, and the motor efficiency is lowered. Therefore, there has been a demand for a rotary electric motor as in the first to fifth embodiments that reduces the influence of winding tightening.

By the way, it is preferable that the outer wall portion 983 of the insulator 980 be parallel to the rotation track R during winding. Therefore, conventionally, as shown in FIG. 14, the insulator 980 is formed so that the outer wall portion 983 is parallel to the rotation track R in a state before winding. However, in the winding step, winding tightening occurs as described above, and the contraction amount of the core 71 is larger on the inner diameter side than on the outer diameter side. For this reason, the attitude | position of the insulator 980 installed as a winding frame in the one end and other end of the core 71 follows also, and it inclines in radial direction. That is, as shown in FIG. 15, the winding portion 981, the inner wall portion 982, and the outer wall portion 983 are also inclined by the inclination angle θ of the axial end surface of the core 71 with respect to the plane T orthogonal to the axial direction.

Therefore, in the conventional configuration, when the conducting wire 72a constituting the coil 72 passes in the vicinity of the outer wall portion 983 in the winding (see FIG. 16), the conducting wire 72a collides with the insulator 980 at high speed. Cannot be controlled, and aligned winding cannot be performed. Moreover, since the insulation film of the conducting wire 72a is damaged by the collision between the conducting wire 72a and the outer wall portion 983, there are problems in both productivity and reliability. Further, in the conventional configuration, the inner wall portion 982 protrudes beyond the inner diameter of the stator 70 and contacts the rotor 61. Further, as shown in FIG. 17, since the winding portion 981 is inclined following the tightening of the core, a tension TS in the axial direction during winding and a component force TSd in the direction in which the winding slides are generated. To do. For this reason, the wound conducting wire 72a slips in the direction of the component force TSd, causing unwinding.

In this regard, according to the rotary electric motor and the compressor in each of the above embodiments, the plurality of insulators 80, 180, 280, 380, and 480 are set in advance on the outer diameter side with respect to the axial direction before winding. since it has only inclined outer wall outer inclination angle theta _o, be inclined radially inward insulator 80,180,280,380, and 480 following the product thickness change of the core 71 by tightening, the outer wall Since 83 and 383 are inclined toward the outer diameter side by the outer inclination angle θ _o , it is possible to suppress the outer wall portion from being inclined toward the inner diameter side due to winding tightening, and the conductor 72 a constituting the coil 72 can be prevented. Damage and the like can be prevented.

Each embodiment mentioned above is a suitable example in a rotary electric machine and a compressor, and the technical scope of the present invention is not limited to these modes. For example, in the above embodiments, with reference to the reference tilt angle theta _MAX, although setting the outer inclination angle theta _o and the inner inclination angle theta _i, not limited thereto, from the reference inclination angle theta _MAX predetermined The outer inclination angle θ _o and the inner inclination angle θ _i may be set with reference to a value obtained by adding or subtracting a threshold value (threshold value determined based on the shrinkage amount of the interlaminar gap δ).

DESCRIPTION OF SYMBOLS 10 Compressor, 20 Airtight container, 21 Main shaft, 21a Oil supply passage, 22 Oil pump, 22a Lubricating oil, 23 Lead wire, 24 Sealed terminal, 30 Intake pipe, 40 Discharge pipe, 50 Compression mechanism part, 51 Fixed scroll, 51a Fixed Vortex body, 52 oscillating scroll, 52a oscillating spiral body, 60 rotary electric motor, 61 rotor, 61a boss, 61b magnet insertion hole, 61c permanent magnet, 61d end plate, 61e balance weight, 61f rivet, 70 stator, 71 Core, 71a Back yoke part, 71b Teeth part, 72 coil, 72a Conductor, 73 coil, 80, 180, 280, 380, 480, 980 Insulator, 81, 181, 281, 381, 481, 981 Winding part, 82, 182, 482, 982 Inner wall, 83, 383, 983 Outer wall, 182a Inner inner lower edge 182b Inner / inner tip, 281a Winding surface, 383a Outer / inner lower edge, 383b Outer / inner tip, 482a Inner / outer lower edge, 482b Inner / outer tip, Di Inner wall inner diameter inclination, Dio Inner wall outer diameter inclination, Dmin distance , Do Outer wall inner diameter tilt amount, R rotation trajectory, S plane, T plane, TS tension, TSd component force, δ interlaminate gap, θ tilt angle, θ _MAX reference tilt angle, θd avoidance angle, θi inner tilt angle, θo outer Tilt angle, θt Winding surface tilt angle.

Claims (14)

The spindle,
A rotor into which the main shaft is inserted;
A stator provided in an annular shape on the outer peripheral side of the rotor,
The stator is
A core formed by laminating a plurality of electromagnetic steel sheets;
Insulators respectively provided at one end and the other end in the axial direction of the core;
And a coil formed by winding a conductor wire through the core between the insulator at one end and the insulator at the other end,
Each insulator is
A winding portion in which the conducting wire is wound in a radial direction;
A rotary motor provided on the outer diameter side of the winding portion, and having an inner wall inclined at an outer inclination angle set to the outer diameter side with respect to the axial direction in a state before the winding . The core after being wound has a reduced thickness as it goes to the inner diameter side than before being wound, and is inclined with respect to a plane perpendicular to the axial direction,
The rotary electric motor according to claim 1, wherein the outer inclination angle is equal to or greater than the inclination angle. 3. The rotary electric motor according to claim 2, wherein the inclination angle is a reference inclination angle calculated based on a thickness and number of stacked cores and an outer diameter and an inner diameter of the stator. The outer inclination angle is less than a reference inclination angle calculated on the basis of the thickness and the number of stacked cores and the outer diameter and inner diameter of the stator,
The inner surface of the outer wall portion has an outer inner lower edge portion located on the core side, and an outer inner tip portion located at the tip,
2. The rotary electric motor according to claim 1, wherein an outer wall inclination amount which is a radial distance between the outer inner lower edge portion and the outer inner tip portion after being wound is equal to or less than a radius of the conducting wire. The rotary electric motor according to any one of claims 1 to 4, wherein the outer wall portion as a whole has the outer inclination angle. The plurality of insulators are provided on an inner diameter side of the winding portion, and in a state before being wound, an outer surface has an inner wall portion inclined by an inner inclination angle set to the outer diameter side with respect to the axial direction. The rotary electric motor according to any one of claims 1 to 5, further comprising: The rotary electric motor according to claim 6, wherein the inner inclination angle is equal to or less than a reference inclination angle calculated on the basis of the thickness and number of stacked cores and the outer diameter and inner diameter of the stator. The inner surface of the inner wall portion has an inner inner lower edge portion located on the core side, and an inner inner tip portion located at the tip,
An inner wall inner diameter inclination amount, which is a radial distance between the inner inner lower edge portion and the inner inner tip portion before being wound, is equal to or greater than a distance between the rotor and the inner inner lower edge portion. Item 8. The rotary electric motor according to Item 7. The inner inclination angle is larger than a reference inclination angle calculated on the basis of the thickness and number of stacked cores and the outer diameter and inner diameter of the stator,
The outer surface of the inner wall portion has inner and outer lower edge portions located on the core side, and inner and outer tip portions located at the tips,
The rotary motor according to claim 6, wherein an inner wall outer diameter inclination amount which is a radial distance between the inner and outer lower edge portions and the inner and outer tip portions after being wound is equal to or less than a radius of the conducting wire. The rotary electric motor according to any one of claims 6 to 9, wherein the inner wall portion as a whole has the inner inclination angle. The rotary electric motor according to any one of claims 1 to 10, wherein the winding surface in the axial direction of the winding portion has a preset winding surface inclination angle with respect to a plane orthogonal to the axial direction. The rotary motor according to claim 11, wherein the winding surface inclination angle is equal to a reference inclination angle calculated on the basis of the thickness and number of stacked cores and the outer diameter and inner diameter of the stator. A sealed container constituting the outer shell;
A compression mechanism that is disposed in the sealed container and compresses the fluid;
A rotary electric motor disposed in the sealed container and rotating the main shaft to drive the compression mechanism,
A compressor equipped with the rotary motor according to any one of claims 1 to 12 as the rotary motor. The compressor according to claim 13, wherein a single refrigerant made of HFO-1123 or a mixed refrigerant containing HFO-1123 is used.

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