JP2019126176A - Insulator, electric motor and equipment using insulator - Google Patents

Abstract

To improve assemblability of an electric motor.SOLUTION: An insulator is provided with a lead wire storage part having an outer wall part formed in a form of accompanying a part or all of a ring; and an inner wall part located on an inner diameter side of the outer wall part.SELECTED DRAWING: Figure 3a

Description

  The present invention relates to an insulator, and a motor and device using the insulator.

  A motor is known which comprises a stator having an insulator arranged at the axial end face of the stator core. A coil is wound around teeth and an insulator of the stator core as a part of the wire.

  The other part or the remaining part of the conducting wire has, for example, a lead wire connected to the power supply terminal block and supplied with a power supply current from the outside as a part drawn from the coil. If the lead wire is not firmly fixed, the lead wire may be damaged or broken due to contact with a driving component such as a rotor.

  Patent Document 1 discloses a scattering prevention insulating cover 9 and a winding fixing string 7 for fixing a lead wire 5 whose winding end is welded or soldered.

Japanese Patent Application Laid-Open No. 2002-044896

  Fixing of the lead wire with a wire fixing cord takes work time, and further, if the scattering prevention insulating cover 9 is disposed axially outside of the coil, the number of parts increases.

  The present invention made in view of the above circumstances is an insulator including a lead wire storage portion having an outer wall portion formed along a part or all of a ring and an inner wall portion positioned on the inner diameter side of the outer wall portion. It is.

The perspective view of the stator of an example Front view of the stator of the embodiment viewed from the axial direction Front view of the insulator of the embodiment Side view and opening schematic of connection point covering part or neutral point covering part of the embodiment Side view and opening schematic of the connection point covering part or neutral point covering part in the state where the lead wire of the embodiment is inserted It is a side view of the stator of an Example, and is an X arrow line view of FIG. It is a side view of the stator of an Example, and is a Y arrow view of FIG. AA cross section of FIG. 2 B-B sectional view of FIG. 2 CC sectional view of FIG. 2 DD cross section of FIG. 2 Longitudinal cross-sectional view of a sealed compressor equipped with the motor of the embodiment Longitudinal sectional view of a refrigerator equipped with a hermetic compressor

  Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. The electric motor 1 can be applied to various known products such as an enclosed type compressor, an air conditioner equipped with the enclosed type compressor, an apparatus such as a heat pump type water heater, and the like.

[Compressor 50 equipped with motor 1 having stator 3]
FIG. 10 is a longitudinal sectional view of a hermetic compressor 50 equipped with the electric motor 1, and FIG. 11 is a longitudinal sectional view of a refrigerator equipped with the hermetic compressor 50. As shown in FIG.

  The hermetic compressor 50 includes a hermetic container 59, a rotor 40 housed in the hermetic container 59 and rotatably provided, and a stator 3 in which a coil 5 connected to a power supply is wound in a plurality of slots. Transmission comprising a motor 1 to be driven, a crankshaft 35 fastened to a rotor 40, a connecting rod 36 for converting the rotational motion of the crankshaft 35 into a reciprocating motion, and a piston 37 that reciprocates according to the converted reciprocating motion. And a compressor mechanism including a valve and a valve plate 19 which opens and closes to switch the suction and suction of the refrigerant gas according to the reciprocating motion of the cylinder and the piston.

  The motor 1 can rotate the rotor 40 together with the shaft 35 by the electromagnetic force generated in the stator 3 by supplying a power supply current to the coil 5.

[Stator 3]
1 is a perspective view of the stator 3 of the present embodiment, FIG. 2 is a front view of the stator 3 of the present embodiment, and FIG. 4 is a side view of the stator 3 of the present embodiment as viewed from arrow X in FIG. 5 is a side view of the stator 3 of the present embodiment, as viewed in the direction of the arrow Y in FIG.

  The stator 3 is, for example, a yoke 31 formed by laminating electromagnetic steel sheets, a coil 5 and a lead wire 7 as a conducting wire through which a current of any of U, V and W phases flows, and a connecting portion as a covering portion A covering portion 9, a neutral point covering portion 11 </ b> C, a first insulator 2, a second insulator 4, and an insulating sheet 60 are provided. A portion of the conducting wire wound around the teeth 311 will be referred to as a lead wire 7 for convenience, as a portion located in a region between the coil 5 and the outer peripheral wall portion 213 and the inner peripheral wall portion 214. One end of the lead wire 7 is connected to the power supply terminal 6.

  The yoke 31 has an annular shape, and has a structure in which a plurality of teeth 311 (nine in the present embodiment) extend toward a space (a space on the inner diameter side) surrounded by the annular portion.

(Conductive wire forming coil 5 and lead wire 7)
The motor 1 of the present embodiment adopts a three-phase drive method, and at least three conducting wires (for example, copper wires) have a coil 5 (5 U, 5 V) so as to flow the current of each phase (U, V, W phases respectively). , 5 W) are required to construct.

  The motor 1 of the present embodiment is constituted by 9 slots more than 3 slots, and each coil 5U, 5V, 5W through which the current of each phase flows is constituted by one or a plurality of electrically connected leads. Can. In the present embodiment, each of the conductors through which the current of one of the phases (hereinafter, may be described as X phase or simply X) flows is wound around three teeth 311. In this embodiment, in order to distinguish the coils 5X belonging to the same phase, the code is 5YX (Y = a, b, or c), and the X-phase coils 5aX, 5bX, 5cX are formed by one lead. It is done. And coil 5aX, 5bX, and 5cX and the conducting wire of the power supply terminal 6 are welded or soldered in the connection part 8X. The lead of the power supply terminal 6 is in a so-called bare state in order to form the connection 8 with the lead on the coil 5X side, and the part on the power supply terminal 6 side is covered.

  That is, for example, a conducting wire through which a U-phase current flows includes three coils 5YU (coils 5aU, 5bU, 5cU) wound around three teeth 311 in all, and a lead wire 7U which is a portion drawn from teeth 311 Have. The lead wire 7U is electrically connected to the coil 5YU at a connection portion 8U. Each of the connection portions 8X is surrounded by, for example, a connection point covering portion 9X as a tube-shaped member formed of an insulating resin, and secures insulation with respect to the surroundings. The connection portions 8X are disposed together with the lead wires 7 in the region between the outer wall portion 213 and the inner wall portion 214 described later.

  As described above, in the present embodiment, reference numerals 5aX, 5bX, and 5cX are applied to the coil as a part of the conducting wire through which the X-phase current flows. In this embodiment, the in-phase coils 5aX, 5bX, 5cX are connected in series with each other, but may be connected in parallel.

Moreover, the neutral point 11 which each three-phase coil 5X variously connected electrically is formed. The neutral point 11 is surrounded by, for example, a neutral-point covering portion 11C as a tube-shaped member formed of an insulating resin, and ensures insulation with respect to the surroundings.
In addition, a part or all of the conducting wire can be insulated and coated as needed. Further, when the coil 5X of each phase is traced from the neutral point 11, the coils 5aX, 5bX, 5cX pass through the connection point 8X and the power supply terminal 6 in this order. The lead wire 7X is located immediately before or after the connection point 8X. The power supply terminal 6 is connected to the terminal pin 31 when the motor 1 is incorporated into the compressor 50.

(Covered part)
3b is a side view of the connection point covering portion 9X or the neutral point covering portion 11C and a schematic view of the opening 91, and FIG. 3c is a side view of the connection point covering portion 9X or the neutral point covering portion 11C in the state where the lead wire 7X is inserted. It is a figure and the opening part 91 schematic. The connection point covering portion 9X or the neutral point covering portion 11C is collectively referred to as a covering portion. The covering portion has an opening 91, a body 92, and a binding portion 93. The lead wire 7X is inserted from the opening 91, and is inserted so that the connection point 8X and the neutral point 11C are located in front of the binding portion 93 which is a closed tip in the cylindrical body portion 92. . The opening 91 has, for example, a substantially elliptical shape. Among the dimensions of the opening 91, the dimension in the lateral direction is d. The relationship with other configurations will be described later.

(First insulator 2)
FIG. 3a is a front view of the first insulator 2 of this embodiment. The first insulator 2 is a member provided on one side of an axial end (that is, an end in a front view) of the stator 3 and is formed along a part or all of the ring of the yoke 31 on the outer peripheral side. A plurality of lead wire storage portions 21, a lead wire storage omission portion 22 formed along a part of the ring of the yoke 31 on the outer peripheral side, a plurality of lead wire storage portions 21 and a lead wire storage omission portion 22 (9 in the present embodiment) tooth insulators 23 are provided.

  The lead wire accommodating portion 21 is added to the floor portion 212 whose one surface side faces the annular portion of the yoke 31 at the time of mounting, the outer wall portion 213, the inner side wall portion 214, the outer pressing portion 215, the inner pressing portion 216, the outer floor hole 217, It has an inner floor hole 218 and a binding aid 219. In this embodiment, the outer pressing portion 215 is formed integrally with the outer wall portion 213 forming a part of the ring, and the inner pressing portion 216 is formed integrally with the inner side wall portion 214 forming a part of the ring. Is provided. However, the outer wall portion 213 and the inner wall portion 214 may be formed so as to form the entire ring.

The floor portion 212 secures an insulation distance with respect to the stator 3 of the lead wire 7 (part of the conducting wire) disposed between the outer wall portion 213 and the inner wall portion 214.
The outer wall portion 213 is located on the outer diameter side of the floor portion 212 and extends along the curvature of the floor portion 212. The inner side wall portion 214 is located on the inner diameter side of the floor portion 212 and extends along the curvature of the floor portion 212. The outer side wall portion 213 and the inner side wall portion 214 are formed as walls protruding in the axial direction of the stator 3, and suppress movement of the lead wire 7, the connection point covering portion 9X and the neutral point covering portion 11C.

  FIG. 8 is a cross-sectional view taken along the line C-C of FIG. The outer pressing portion 215 is provided one or more along the circumferential direction of the outer wall portion 213, and protrudes outward from the outer rising portion 2151 extending in the axial direction and the outer rising portion 2151 to the first insulator And an outer protrusion 2152 overlapping with the floor portion 213 or the outer floor hole 217 in a front view of FIG. The extension distance of the outer protrusion 2152 is preferably larger than the extension distance of the inner protrusion 2162 of the inner pressing portion 216 described later. In such a case, the lead wire 7 usually exerts a restoring force toward the outer diameter side, so that the movement of the lead wire 7 can be suppressed more effectively.

  Connection point covering portion The connection point covering portion 9 and the lead wire 7 are accommodated between the floor portion 212 (outside floor hole 217) and the outer projection 2152. Since this area that accommodates the connection point covering portion 9 and the lead wire 7 is curved in an annular shape, normally, the connection point covering portion 9 and the lead wire 7 are in a bent state, and toward the outer diameter side Resilience works. For this reason, it is preferable that the amount of projection of the outer projection 2152 be half or more of the radial dimension (approximately equal to the dimension d in the short direction in the present embodiment) when the connection point covering portion 9 is stored. . The connection point covering portion 9 is also routed so as to be disposed above the lead wire 7. As a result, the connection point covering portion 9 can suppress the lead wire 7 to effectively suppress the movement.

  FIG. 9 is a cross-sectional view taken along the line DD of FIG. The inner pressing portion 216 is provided one or more along the circumferential direction of the inner side wall portion 214, and protrudes to the outer diameter side from the inner rising portion 2161 extending in the axial direction and the inner rising portion 2161. And an inner protrusion 2162 overlapping the floor portion 213 or the inner floor hole 218 in a front view of the insulator 2.

  The connection point covering portion 9 and the lead wire 7 are accommodated between the floor portion 212 (inner floor hole 218) and the inner projection 2162. The amount of protrusion of the inner protrusion 2162 to the outer diameter side is not particularly limited, but is preferably an amount that does not reach the outer wall 213 and is less than or less than the amount of protrusion of the outer protrusion 2152.

  The positions at which the outer pressing portion 215 and the inner pressing portion 216 are respectively disposed are not particularly limited as long as they are the outer wall portion 213 and the inner wall portion 214 respectively, but they are staggered so as not to overlap in the radial direction as in the present embodiment. If it is provided in a shape, it is preferable in that the movement of the lead wire 7 can be suppressed with a small number. A value obtained by subtracting the sum of the radial protrusion amount of the outer pressing portion 215 and the radial protrusion amount of the inner pressing portion 216 from the radial dimension of the outer wall portion 213 and the inner wall portion 214 is the width dimension of the covering portion. It is not more than 1.2 times, preferably not more than 1.0 times, more preferably not more than 0.9 times d.

  The outer floor hole 217 is a through hole of the floor portion 212 provided at a position overlapping with a part or all of the outer pressing portion 213 in a front view. The inner floor hole 218 is a through hole of the floor portion 212 provided at a position overlapping with a part or all of the inner pressing portion 214 in a front view. By providing the floor holes 217 and 218, the amount of resin required for manufacturing the first insulator 2 can be reduced. Further, by setting the positions of the floor holes 217 and 218 in this manner, it is possible to suppress the reduction in strength as compared with the reduction of the resin.

  The binding assisting portion 219 is a portion capable of assisting fixing of a portion near the power supply terminal 6 in the lead wire 7 and is a portion provided on the outer wall portion 213. The binding assisting portion 219 is preferably slightly larger than the outer pressing portion 215, and has a rising portion 2191 and a shape in which a vertex 2192 protrudes from the upper end side of the rising portion 2192 toward the outer diameter side (FIG. 5 and FIG. See, for example, FIG. 6 which is a cross-sectional view taken along the line AA of FIG. The lead wire 7 can be effectively fixed by putting a binding member 20 such as a cord on the rising portion 2191 of the binding auxiliary portion 219 and tying the lead wire 7 with the binding member 20 for tightening.

  The lead wire storage and omission portion 22 may be formed when the lead wire storage portion 21 is smoothly and virtually extended. The floor portion 212, the side wall portion 213, the inner side wall portion 214, the outer pressing portion 215, and the inner pressing portion 216 is not provided. The amount of resin used can be reduced by designing the lead wire 7 to fall within the range in which the lead wire storage portion 21 is formed on the stator 3 side while providing the lead wire storage omission portion 22.

  The teeth insulating portion 23 is a portion overlapping the teeth 311 when the first insulator 2 is attached to the stator 3. The axially extending protrusions 231 and 232 are provided on both sides in the circumferential direction of the teeth insulating portion 23 (See Figure 7 etc.)

(2nd insulator 4)
The second insulator 4 is an axis of the stator 3 as a member suitable for passing along a connecting wire (lead wire 7) as a portion for conducting wires to a position separated from the coil 5, such as different slots as necessary. It is a member disposed on the other side of the direction. Although various well-known ones can be used as the second insulator 4, it is preferable to have a structure which will be described later with respect to the support structure of the insulating sheet 60.

(Insulation sheet 60)
7 is a cross-sectional view taken along the line B-B in FIG. The insulating sheet 60 is a member that faces the side surface of the yoke 31 and improves the insulation between the coil 5X and the yoke 31. The insulators 2 and 4 respectively have insulating sheet support portions 231, 232, 431 and 432 extending in the axial direction from the side tops of the yoke 31. From the viewpoint of securing the number of turns of the coil 5X, it is preferable that the insulation thickness be thin. In the present embodiment, the insulating sheet 60 is configured so as to be exposed from the insulators 2 and 4 in 1/3 or more, preferably 1/2 or more in the axial direction.

  The insulators 2 and 4 are made of, for example, a heat-resistant resin material such as liquid crystal polymer (LCP), polybutylene terephthalate (PBT), polyphenylene sulfide (PPS), polyimide, or polyester. For example, it may consist of material containing glass fiber for strength improvement, and is not particularly limited.

DESCRIPTION OF SYMBOLS 1 motor 2 1st insulator 21 lead wire storage part 212 floor part 213 outer side wall part 214 inner side wall part 215 outer side pressing part 216 inner side pressing part 217 outer floor hole 218 inner floor hole 219 binding auxiliary part 22 lead wire storage omission part 23 teeth Insulation 3 Stator 31 Yoke 311 Tees 4 Second insulator 5 Coil (conductor)
6 Power supply terminal 7 Lead wire (conductor)
8 connection point 9 connection point covering portion 11 neutral point 11C neutral point covering portion 20 binding member 40 rotor 50 closed type compressor 60 insulation sheet 100 refrigerator (equipment)

Claims (8)

  An insulator comprising: a lead wire storage portion having an outer wall portion formed along a part or all of a ring and an inner wall portion positioned on the inner diameter side of the outer wall portion. A floor formed between the outer wall and the inner wall;
An outer pressing portion having a portion projecting radially inward from the outer wall portion and having a portion overlapping the floor portion in a front view, and / or an outer diameter side projecting from the inner wall portion and overlapping the floor portion in a front view The insulator according to claim 1, further comprising: an inner pressing portion having a portion.   The insulator according to claim 2, wherein the floor portion is provided with a through floor hole. An insulator according to any one of claims 1 to 3;
A three-phase drive motor having a stator;
The stator is
Teeth,
A wire having a coil wound around the teeth and a lead wire drawn from the teeth;
A power supply terminal electrically connected to the lead wire via a connection point;
And a covering portion covering a neutral point at which the connection point or each phase of the lead wire is electrically connected to each other,
At least a part of the lead wire and / or the covering portion are disposed in the lead wire storage portion. At least a portion of the lead wire and the covering portion are disposed in the lead wire storage portion,
5. The electric motor according to claim 4, wherein at least a part of the lead wire is disposed below the covering portion. An insulator according to claim 2 or 3;
A three-phase drive motor having a stator;
The stator is
Teeth,
A coil wound around the teeth and a lead wire having a lead wire drawn from the teeth;
The lead wire is provided with a covering portion covering a connection point at which the in-phase ones are connected to each other or a neutral point at which the respective phases are connected to each other,
The covering portion is disposed in the lead wire storage portion,
Assuming that the short dimension of the covering portion is d,
A value obtained by subtracting the sum of the radial protrusion amount of the outer pressing portion and the radial protrusion amount of the inner pressing portion from the radial dimension of the outer wall portion and the inner wall portion is 1.2 d or less A feature motor. An insulator according to any one of claims 1 to 3;
With the stator,
A three-phase drive type motor having a binding member,
The stator is
Teeth,
A wire having a coil wound around the teeth and a lead wire drawn from the teeth;
A power supply terminal electrically connected to the lead wire of each phase;
The insulator has a binding assisting portion provided on the outer wall portion,
A part of the lead wire in the vicinity of the power supply terminal is tightened by the binding member together with the binding auxiliary portion.   An apparatus comprising the insulator according to any one of claims 1 to 3 or the electric motor according to any one of claims 4 to 7.

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