JP5202181B2 - Electric motor - Google Patents

Description

  The present invention relates to an electric motor mounted on a hermetic compressor used in an outdoor unit such as a refrigerator or an air conditioner, or fixing of a winding end portion in which a winding is wound around a teeth portion of a stator of an electric motor used for a vehicle. About.

  In recent years, motors mounted on hermetic compressors used for outdoor units such as refrigeration and air conditioners, or stators for motors used for vehicles, are provided with resin insulation on the teeth of the stator. The number of electric motors using a concentrated winding method in which windings are wound directly is increasing. The concentrated winding type electric motor requires less copper than the conventional distributed winding type, and can reduce copper loss and improve the performance of the electric motor.

  Depending on the number of poles, the stator of a motor with a concentrated winding system has a large number of lead wires drawn from the end of the winding, and accordingly, the lead wires drawn from the end of the winding and the connection points connecting them are processed. And the fixing method also becomes a problem. In many electric motors that use resin insulation for the stator, the lead wire and lead wire drawn from the end of each winding and the connection point connecting them are fixed integrally with the resin insulation with a winding fixing string, or the stator Provided with a resin wall facing the stator inner diameter side that extends in the axial direction from the end, and a locking part that locks the lead wire to the resin wall facing the outer diameter side of the stator. The workability is remarkably deteriorated because it must be fixed.

  There exists an electric motor which is indicated by patent documents 1 (Unexamined-Japanese-Patent No. 2002-44896) with respect to such an electric motor. This application is shown in FIG. 6 includes a resin barrel portion 70c for winding the winding 60 around the teeth portion 40 of the stator 100, an outer peripheral side wall 70a that faces the stator inner diameter and extends from the resin barrel portion in the stator axial direction. In order not to scatter the lead wires and lead wires drawn out from the winding ends of the windings wound by the concentrated winding method on the insulating member 70 provided integrally with the peripheral side wall 70b and the connection point 80 connecting them. The insulating cover 90 provided with the diameter wall 90a and the inner diameter wall 90b is housed in a space between the coil end portion and the insulating cover 90.

  As a result, the lead wire and the lead wire drawn out from each winding end wound around the tooth portion 40 and the connection point 80 connecting them are fixed to the resin insulation integrally with the winding fixing string, or fixed. Eliminates the hassle of securing and fixing the lead wires and lead wires drawn from the ends of the windings to the resin wall facing the inner and outer diameter sides of the resin-insulated stator that extends in the axial direction from the child end. This is an electric motor that has improved workability by preventing the wires, lead wires and connecting point 80 connecting them from being scattered apart.

JP 2002-44896 A

  However, in such an electric motor, it is provided on the insulating member to prevent scattering of the lead wire and the lead wire drawn out from each winding end portion wound around the teeth portion of the stator by concentrated winding and the connection point connecting them. The outer diameter side resin wall and inner diameter side resin wall and the insulating cover for preventing scattering are only housed in the space between the coil end portion and the insulating cover, and the circumferential direction of the stator of the motor With respect to vibration and the like, the connection point insulation is easily shifted.

  In general, connection points that insulate the connection points so as not to come into contact with the windings wound around the teeth of the stator are applied to the connection points connecting the lead wires and the lead wires drawn from the ends of the windings. In this connection point insulation, there is a risk that the connection point insulation is displaced from the connection point in the circumferential direction of the coil end due to vibrations of the motor or the like. In this way, if the insulation at the connection point shifts and falls off, resulting in poor insulation, there is a risk that the motor will burn out.

  Therefore, the outer diameter side resin wall and the inner diameter side resin wall extending in the direction of the stator axis opposite to the stator end face side, and the insulation cover for preventing scattering, lead out the lead wire and lead wire drawn from each winding end. In addition to storing the connected connection point in the space between the coil end part and the insulation cover, the connection point insulation is connected to the coil end part from the connection point connecting the lead wire or lead wire drawn out from each winding end. There is a need for an electric motor that is securely fixed so that it does not fall off in the circumferential direction.

A resin-molded insulating member is attached to the axial end surface of the stator,
The insulating member includes a resin insulating body for insulating the teeth and the winding, and an inner circumference facing the stator inner diameter side and extending from the resin insulating body in the stator axial direction opposite to the stator end surface. In the stator equipped with the insulating member having the side wall and the outer peripheral side wall facing the outer diameter side of the stator and extending from the resin insulation body portion in the direction of the stator axis opposite to the stator end face side,
The coil end portion of the winding wound around the teeth portion is provided with a connection point insulation in which a lead wire or a lead wire drawn from each winding end portion is connected and insulated, and the stator shaft of the insulating member Engage and fix the insulating cover so as to cover the insulating member so that the leader line and connection point insulation do not jump out from the direction,
The insulating cover is provided with a partition plate extending from the back side facing the coil end portion of the insulating cover to the stator end surface side, and the connection point insulation is isolated in a space from the lead wire fixing position to the partition plate. The motor is stored.

  The position of the partition plate extending from the back side facing the coil end portion of the insulating cover to the stator end surface side is the electric motor provided at the position of the center upper end portion of the winding wound around the teeth.

  The electric motor of the present invention includes a stator tooth portion and a stator tooth portion so that connection points connecting lead wires and lead wires drawn from the winding end portions wound around the tooth portion of the stator are not scattered and scattered. Resin insulation body for insulating windings, outer diameter side resin wall and inner diameter side resin wall facing the stator inner diameter of this resin insulation body and extending in the stator axial direction opposite to the stator end face side In addition, by connecting the lead wire or lead wire drawn from each winding end with the insulating cover for preventing scattering, the connection point insulation, which is insulated, is connected to the coil end portion of the winding wound around the resin insulation body It is housed in the space between the insulation cover and the connection point insulation is shifted from the connection point where the lead wire and the lead wire drawn out from each winding end are connected by the vibration oscillating in the circumferential direction of the coil end portion of the motor. The coil cover of the insulation cover should not fall off. A partition plate extending from the back side facing the gate portion to the stator end surface side is provided, and the connection point insulation is separated and housed in the space from the lead wire fixing position to the partition plate so that the connection point insulation is coil end portion. The movement in the circumferential direction can be restricted.

  In other words, the connection point insulation contacts the partition plate extending from the back side facing the coil end portion of the insulating cover to the stator end surface side, and the circumferential end portion bound to the bag-like connection point insulation bag contacts the coil. The movement in the circumferential direction on the end portion can be restricted, and the connection point insulation is prevented from falling off due to vibration of the electric motor or the like. This prevents the connection point from coming into contact with the winding of the coil end portion, resulting in poor insulation and burning.

  Further, the partition plate is provided so as to be positioned at an upper end portion of the center of the teeth of the winding wound around the teeth. In this case, when a partition plate is provided between the windings wound around adjacent teeth, the refrigerant passage in the gap between the windings is blocked, and the refrigerant efficiency in the hermetic compressor is deteriorated. In view of this, the coil is provided so as to be positioned at the upper end of the center of the tooth of the winding obtained by winding the winding around the tooth having a small influence as a refrigerant passage. In addition, by providing the coil around the teeth so that it is located at the upper center of the center of the teeth, the insulation cover can be used more easily than when a partition plate is provided between the coils wound around the teeth. The material used can be reduced.

The present invention will be described with reference to FIGS. FIG. 1 is a front view of the motor as viewed from above.
FIG. 2 is a front view of the electric motor shown in FIG. 1 before the insulating cover 9 is attached to the electric motor of the present invention. The stator 1 of the electric motor has a tooth portion 4 extending from the yoke portion 2 in the inner diameter direction of the stator 1, and six slots 3 are formed by the yoke portion 2 and the tooth portion 4. On both end surfaces of the stator 1 in the axial direction, a resin insulation body 7c (see FIG. 7) for insulating the tooth portion 4 and the winding 6 and a resin insulation facing the inner diameter side of the stator 1 The inner peripheral side wall 7b extending in the axial direction of the stator 1 opposite to the end surface side of the stator 1 from the body portion 7c, and the end surface of the stator 1 from the resin insulating body portion 7c facing the outer diameter side of the stator 1 An insulating member 7 having an outer peripheral side wall 7a extending in the stator axial direction opposite to the side is mounted. The resin insulation 7 is provided with a concentrated winding type winding in which the winding 6 is directly wound.

  A film-like insulating film is attached to the slot 3 formed in the yoke portion 2 and the tooth portion 4 of the stator 1 of the electric motor so as to cover the surface of the slot. Similarly, it is also possible to use upper and lower separate type resin-insulated slot insulation that extends from the insulating member 7 in the slot axis direction of the slot 3 and is mounted in the vicinity of the center in the slot axis direction.

  In the coil end portion of the resin insulation body portion 7c around which the winding 6 of the tooth portion 4 is wound, a lead wire or a lead wire 5 drawn from each winding end portion and a connection point 8 connecting them are arranged. . In this embodiment, the coil | winding 6 wound around the teeth part 4 of the stator 1 is connected by 3 phase 4 poles and 2Y.

  The U-phase lead wire 5U is connected to one end portion of the lead wire drawn from the winding end portion of the winding 6 wound around each tooth portion 4 to form a connection point 8u, and the other end portion is A neutral point 8a is formed. Similarly, the V-phase lead wire 5V is connected to one end portion of the lead wire drawn from the winding end portion of the winding 6 wound around each tooth portion 4 to form a connection point 8v. The edge part of this constitutes a neutral point 8a. Further, the W-phase lead wire 5W is connected to one end portion of the lead wire drawn from the winding end portion of the winding 6 wound around each tooth portion 4 to form a connection point 8w, and the other end The part constitutes a neutral point 8a. Each connection point is insulated by covering the connection point. The “connection point” in the present embodiment includes a state in which the connection point is insulated.

  In addition, the structure of the connection point insulation 8 used by a present Example winds the thin-film-like insulation sheet in roll shape in multiple times, welds one end part, binds it to a bag, and opens the other end part. A bag-like connection point insulation structure is formed in which a connection point portion connected to a lead wire or a lead wire 5 connected from the end of each winding is inserted through the insertion hole opened in the connection point insulation 8.

  The insulating cover 9 will be described with reference to FIGS. FIG. 3 is a view from the front side of the insulating cover 9 attached to the electric motor shown in FIG. 4 is a view as seen from the back side of the insulating cover 9 attached to the electric motor shown in FIG. The insulating cover 9 has a bottom end 9c of the back side insulating cover 9 facing the coil end portion (a surface facing the stator end surface side in a state of being locked to the insulating member 7) from the stator outer diameter side to the stator end surface. And an inner diameter wall 9b extending from the stator inner diameter side of the bottom portion 9c of the insulating cover 9 to the stator end face side. In the present embodiment, a locking portion 9d formed in a key shape is provided at the top end portion of the outer diameter wall 9a of the insulating cover 9, so that the insulating member 7 can be securely locked. FIG. 7 shows a state where the insulating member 7 and the insulating cover 9 are locked. FIG. 7 is a cross-sectional view taken along line E-E ′ of FIG. 1. A retaining portion 9d provided on the outer diameter wall 9a on the stator outer diameter side of the insulating cover 9 is retained on the retaining portion on the outer peripheral side wall 7a on the stator outer diameter side of the insulating member 7. As a result, the insulating cover 9 does not fall off from the insulating member 7 due to vibration of the electric motor or the like, and the connection point insulation 8 can be reliably isolated and stored.

  The insulating cover 9 has a lead wire fixing groove 11 cut out from the outer diameter of the stator of the insulating cover 9 toward the inner diameter of the stator so that the lead wire 5 can be easily fixed at the lead wire fixing position. Is provided, and the lead wire 5 is engaged and fixed to the lead wire fixing groove 11. The lead wire fixing groove 11 has a notch groove bottom portion 11c that is slightly wider than the notch groove insertion portion 11b so that the root portion of the lead wire 5 is easily fixed. Further, the shape of the notch groove bottom portion 11c of the lead wire fixing groove 11 is circular, square, triangular, etc., and the lead wire 5 is securely fixed and does not shift. Further, the lead wire fixing groove 11 cut out from the outer diameter of the stator of the insulating cover 9 toward the inner diameter of the stator so that the lead wire 5 can be easily fixed is connected to the lead wire fixing groove 11. In order to facilitate insertion, the funnel-shaped insertion slot 11a is used in consideration of workability. As a result, the lead wire 5 can be easily inserted into the lead wire fixing groove 11, and workability can be improved. In addition, since it is an electric motor mounted in a hermetic compressor, an air hole 10 through which a refrigerant flows is provided on the surface of the insulating cover 9.

  The insulating cover 9 has a connection point 8 connected to a lead wire or a lead wire 5 drawn from the winding end of the winding 6 wound around each of the tooth portions 4 described above. An insulating cover 9 is engaged and fixed so as to cover the insulating member 7 so as not to protrude from the direction, and a partition plate 12 extending from the back side facing the coil end portion of the insulating cover 9 to the stator end surface side is provided. In addition, the connection point insulation 8 is housed in the space from the lead wire fixing position (lead wire fixing groove 11) to the partition plate 12.

  Thereby, the connection point insulation 8 is connected to the partition plate 12 extending from the back side facing the coil end portion of the insulating cover 9 to the stator end surface side, and the end portion in the circumferential direction bound to the bag of the connection point insulation 8 formed into a bag shape. , And the movement of the connection point on the coil end portion in the circumferential direction can be restricted, so that the connection point insulation 8 is prevented from falling off due to vibration of the motor or the like, and the connection point is connected to the coil 6 of the coil end portion. There is no insulation failure and no burning accident.

  The lead wire fixing position of the present embodiment is that the lead wire fixing groove 11 is the lead wire fixing position because the lead wire 5 is fixed by the lead wire fixing groove 11 of the insulating cover 9. It is not limited to this method. From the back side facing the coil end portion of the insulating cover 9, the space in the circumferential direction of the coil end portion extending to the stator end surface side and the inner peripheral side wall 7 b and the outer peripheral side wall of the insulating member 7 around which the winding 6 is wound. The connecting end portions of the lead wires and the lead wires 5 drawn from the end portions of the windings are housed in a space between the coil end portions in the radial direction sandwiched between 7a.

  This is shown in FIG. FIG. 5 is a view taken in the direction of arrow A viewed from the inner diameter of the stator shown in FIG. In order to simplify the drawing, the inner peripheral side wall 7b of the insulating member 7 is not shown for convenience. The lead wire drawn out from the U-phase winding 6 is connected to one end portion of the U-phase lead wire 5U, and is covered with a connection point insulation 8U that is bound to one end of the bag. The connection point insulation 8U is brought into contact with a partition plate 12a extending from the back side of the insulating cover 9 to the stator end face so that the connection point insulation 8U does not fall off from the connection point. The other end of the U-phase lead wire 5U is fixed at the lead wire fixing groove 11 so that the lead wire 5U rises from the upper end of the coil end, and the movement of the lead wire itself is forced and fixed so as not to move. ing.

  The lead wire drawn from the V-phase winding 6 is connected to one end portion of the V-phase lead wire 5V, and is covered with a connection point insulation 8V that is bound to one end of the bag. The connection point insulation 8V is brought into contact with a partition plate 12a extending from the back side of the insulating cover 9 to the stator end face so that the connection point insulation 8V does not fall off from the connection point. The other end of the V-phase lead wire 5V is fixed by the lead wire fixing groove 11 so that the lead wire 5V rises from the upper end of the coil end, and the movement of the lead wire itself is forced and fixed so as not to move. ing.

  Since the structure is the same as that shown in FIG. 5A, the description in the figure is omitted. However, the lead wire drawn from the W-phase winding 6 is connected to one end of the W-phase lead wire 5W. The connection point insulation 8W with one side bound is covered. The connection point insulation 8W is brought into contact with a partition plate 12b extending from the back side of the insulating cover 9 to the stator end face so that the connection point insulation 8W does not fall off from the connection point. The other end of the W-phase lead wire 5W is fixed by the lead wire fixing groove 11 so that the lead wire 5W rises from the upper end of the coil end, and the movement of the lead wire itself is forced and fixed so as not to move. ing.

  Similarly, for the connection of the neutral point, the lead wires drawn from each phase are connected to each other, and the connection point insulation in which one side is bound is covered. The connection point insulation 8a is brought into contact with a partition plate 12a extending from the back side of the insulating cover 9 to the stator end face so that the connection point insulation 8a does not fall off from the connection point. Since the lead wire 5U, 5V, and 5W are fixed to the side of the connection point insulation 8a that is not bound to the bag so as to rise from the lead wire fixing groove 11 described above from the coil top end portion, The fixed portion (lead wire fixing position) of the lead wires 5U, 5V, and 5W of the part becomes a barrier and the movement in the coil end circumferential direction is forced and fixed so as not to move.

  Further, the position of the partition plate 12 where the connection point insulation 8 abuts on the partition plate 12 extending from the back side facing the coil end portion of the insulating cover 9 to the stator end surface side is the connection point of the lead wire and the lead wire 5. It is only necessary that the connection point insulation 8 does not come off. Therefore, in this embodiment, the U-phase and V-phase connection point insulation 8U and 8V are separated and stored by the partition plate 12a, and the W-phase and neutral connection point insulation 8W and 8a are separated and stored by the partition plate 12b. However, if the connection point insulation 8U, 8V, 8W, and 8a are collected in one place, they can be separated and stored by only one of the partition plates 12a and 12b. Further, the position to be isolated and the position and number of the partition plates 12 can be arbitrarily determined by the length of the lead wire 5 and the like.

  In addition, when using the electric motor of this embodiment for a hermetic compressor, when considering the refrigerant efficiency in the hermetic compressor, it is necessary to prevent the refrigerant passage from being blocked as much as possible. Therefore, as a position where the partition plate 12 extending from the back side facing the coil end portion of the insulating cover 9 to the stator end surface side is provided, the upper end of the center of the tooth 4 of the winding 6 in which the winding 6 is wound around the tooth 4 is provided. It is provided to be located. Thereby, since the partition plate 12 does not come between the windings wound around the adjacent teeth 4, the refrigerant can smoothly flow into and out of the gap between the windings without blocking the refrigerant passage in the hermetic compressor. Can be prevented.

  Further, a partition plate 12 is provided between the winding 6 wound around the tooth 4 and the winding 6 by providing the winding 6 around the tooth 4 so as to be positioned at the center upper end portion of the tooth 4 of the winding 6. Compared with the case where it provides, the usage-amount of the insulating material used for the insulating cover 9 can also be reduced.

The front view which looked at the stator of the electric motor of this embodiment from the top. The figure before attaching an insulating cover to the stator of the electric motor of FIG. The figure of the insulation cover of this embodiment. The figure of the back side of the insulating cover shown in FIG. The A arrow directional view seen from the stator inner diameter side shown in FIG. Sectional drawing of the coil end part of the electric motor of a prior art example. Detailed view of locking part between insulating member and insulating cover

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,100 ... Stator 2 ... Yoke part 3 ... Slot 4, 40 ... Teeth part 5 ... Lead wire 6, 60 ... Winding 7, 70 ... Insulation part 7a, 70a ... outer peripheral side wall 7b, 70b ... inner peripheral side wall 7c ... trunk part 8, 8a, 8u, 8v, 8w, 80 ... connection point 9, 90 ... insulating cover 9a, 90a ... Outer diameter walls 9b, 90b ... Inner diameter walls 9c, 90c ... Bottom 10 ... Air hole 11 ... Lead wire fixing groove (Lead wire fixing position)
11a ... funnel-shaped insertion slot 11b ... notch groove insertion part 11c ... notch groove bottom 12a, 12b ... partition plate

Claims (2)

A resin-molded insulating member is attached to the axial end surface of the stator,
The insulating member includes a resin insulating body for insulating the teeth and the winding, and an inner circumference facing the stator inner diameter side and extending from the resin insulating body in the stator axial direction opposite to the stator end surface. In the stator equipped with the insulating member having the side wall and the outer peripheral side wall facing the outer diameter side of the stator and extending from the resin insulation body portion in the direction of the stator axis opposite to the stator end face side,
The coil end portion of the winding wound around the teeth portion is provided with a connection point insulation in which a lead wire or a lead wire drawn from each winding end portion is connected and insulated, and the stator shaft of the insulating member Engage and fix the insulating cover so as to cover the insulating member so that the leader line and connection point insulation do not jump out from the direction,
The insulating cover is provided with a partition plate extending from the back side facing the coil end portion of the insulating cover to the stator end surface side, and the connection point insulation is isolated in a space from the lead wire fixing position to the partition plate. An electric motor characterized by being housed. The position of the partition plate extending from the back side facing the coil end portion of the insulating cover to the stator end surface side is provided at the position of the upper center portion of the teeth wound around the teeth. The electric motor according to item 1.

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