JP2014233124A - Stator cover for rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify terminal processing of a rotary electric machine, and to miniaturize the rotary electric machine.SOLUTION: A stator cover (4) attached to a stator of a rotary electric machine comprises: an inner surrounding wall (10) and an outer surrounding wall (20) that respectively corresponds to the respective parts of an internal cylinder and an external cylinder that are coaxial cylinders; and a coupling wall (30) coupling the inner surrounding wall and the outer surrounding wall with each other. On at least any one of the outer surrounding wall, the inner surrounding wall, and an outer wall surface of the coupling wall, wire connection part housing holes (21a to 21c) where wire connection parts between terminal lines led from a coil of the stator and lead wires for supplying a current to the terminal lines are housed, are provided. The coupling wall is provided with an auxiliary wall (31) in a circumferential direction. By the auxiliary wall, the inner surrounding wall surface of the outer surrounding wall, and the outer surrounding wall of the inner surrounding wall, a plurality of grooves (32a-32c) in which the terminal lines and the lead wires are installed are formed.

Description

  The present invention relates to a stator cover that is attached to a stator of a rotary electric machine including an AC motor and performs terminal processing of the stator.

  Patent Document 1 is known as a conventional terminal processing structure of an electric motor. FIG. 22 of the same document shows a terminal of a stator using a temporary terminal block bonded to a stator core, a main terminal block attached to the temporary terminal block, and a coil connection terminal integrated with the temporary terminal block. The point which processes is disclosed. Such a terminal processing step is performed manually.

  Moreover, in order to automate the process of a terminal process, it is disclosed by FIG. 9 of the said patent document 1 to perform a terminal process using the cover which covers a stator core, a terminal block, an upper terminal block, and a rotor. This cover is comprised from the lower cover which covers a stator core, and the upper cover which covers a coil end, a terminal block, and an upper terminal block.

Japanese Patent Laid-Open No. 10-14152

  In the case of a conventional terminal processing structure of an electric motor, for example, when the diameter of a coil winding and the diameter of a lead wire differ depending on the electric motor, a dedicated terminal and setup for the electric motor are required. There was a problem that it was not suitable for manufacturing. There is also a problem that a plurality of terminal blocks are required and the number of parts increases. Furthermore, there is a problem that the size of the motor itself increases due to the large number of parts. In addition, since the lead wire is not conventionally fixed, it is considered that the lead wire pull-out strength is weak.

  Such a problem exists regardless of whether the process of terminal processing is manual or automated. In addition, the equipment for automation is generally complicated and the equipment cost is high, and the setup is more difficult than the manual work.

  An object of the present invention is to eliminate such inconvenience, simplify terminal processing of a rotating electric machine including an electric motor, and reduce the size of the rotating electric machine.

  In order to achieve the above object, a stator cover attached to a stator of a rotating electrical machine according to the present invention includes an inner peripheral wall and an outer peripheral wall corresponding to a part of each of an inner cylinder and an outer cylinder that are coaxial cylinders, and the inner peripheral wall. And a connecting wall connecting the outer peripheral wall, and at least one of the outer peripheral wall, the inner peripheral wall, and the outer wall surface of the connecting wall, a terminal line drawn from the coil of the stator, and the terminal A connection portion storage hole for storing a connection portion with a lead wire for supplying current to the wire is provided, an auxiliary wall is provided in the circumferential direction on the connection wall, the auxiliary wall, an inner peripheral wall surface of the outer peripheral wall, and the A plurality of grooves in which the terminal wires and the lead wires are installed are formed by the outer peripheral wall surface of the inner peripheral wall.

  ADVANTAGE OF THE INVENTION According to this invention, the terminal process of the rotary electric machine containing an electric motor can be simplified and size reduction of a rotary electric machine can be achieved.

(A) It is a top view of the stator with which the stator cover was attached. (B) It is a side view of the stator with which the stator cover was attached. It is a top view of a stator cover. It is a perspective view of a stator cover. It is another perspective view of a stator cover. It is explanatory drawing of another form of a stator cover. It is explanatory drawing of another form of a stator cover. It is explanatory drawing of another form of a stator cover. It is explanatory drawing of another form of a stator cover. It is explanatory drawing of another form of a stator cover. It is explanatory drawing of another form of a stator cover. It is explanatory drawing of another form of a stator cover. It is explanatory drawing of another form of a stator cover. It is explanatory drawing of another form of a stator cover.

[First embodiment]
With reference to FIG. 1, an embodiment of a stator of an AC motor will be described. First, a stator 1 of an AC motor includes a substantially cylindrical stator core 2 made of a laminated iron plate, and a three-phase coil 3 wound around the stator core.

  Of the coil 3, a resin-made stator cover 4 is provided so as to cover a part of the coil end portion 3 a protruding from the end surface 2 a of the stator core 2 in the motor rotation axis direction. The stator cover 4 accommodates connection portions of the three terminal wires of the coil 3 and the three lead wires 5 for allowing current to flow through the terminal wires. Specifically, the three lead wires 5 are a first lead wire 5a, a second lead wire 5b, and a third lead wire 5c. The stator cover 4, the terminal wire, and the lead wire 5 are raced by the racing yarn 6 and fixed to the coil end portion 3a.

  Hereinafter, the motor rotation shaft is also simply referred to as a shaft.

  Details of the structure of the stator cover 4 are shown in FIGS. The stator cover 4 includes an inner peripheral wall 10 and an outer peripheral wall 20 corresponding to a part of each of an inner cylinder and an outer cylinder that are coaxial cylinders, and a connection wall that connects the inner peripheral wall and the outer peripheral wall and extends in the circumferential direction. 30. The cross-sectional shape of the stator cover 4 in the radial direction is substantially H-shaped. That is, the inner peripheral wall 10 and the outer peripheral wall 20 are formed so as to extend from both radial ends of the connecting wall 30 to both sides along the axial direction.

  The outer peripheral wall 20 is provided with connection portion accommodation holes 21 in the axial direction over three locations for accommodating the connection portions of the three terminal wires of the coil 3 and the lead wires 5a to 5c. Of the three connection portion storage holes 21, the first connection portion storage hole 21 a is located farthest from the auxiliary wall 31 and the third connection portion 21 is located closest to the auxiliary wall 31. This is a connection portion storage hole 21c. And it is the 2nd connection part accommodation hole 21b located between the 1st connection part accommodation hole 21a and the 3rd connection part accommodation hole 21c. The connection part accommodation hole 21 is not a through-hole but a dead-end hole, and its radial cross-sectional shape is an ellipse.

  A first recess 23a is provided on the axial end surface 22 of the outer peripheral wall 20 in a substantially inner diameter direction so as to communicate with the first connection portion accommodation hole 21a. Similarly, the second depression 23b is provided in the substantially inner diameter direction so as to communicate with the second connection portion accommodation hole 21b, and the third depression 23c is provided so as to communicate with the third connection portion accommodation hole 21c. ing. Each of the recesses 23a to 23c is provided with a lead wire locking portion 24 having a shape protruding from the vicinity of the axial end surface 22.

  Similarly, on the end surface 22 in the axial direction of the outer peripheral wall 20, five recessed portions 25 extending in the radial direction are provided at positions different from the connection portion accommodating holes 21 a to 21 c. On another axial end surface 26 of the outer peripheral wall 20 facing the axial end surface 22, a concave portion 27 is provided in a radial direction at a position facing the concave portion 25. Similarly, a chamfered portion 26 a is provided on the axial end surface 26.

  On the outer peripheral wall surface of the outer peripheral wall 20, a meat steal 28 having a concave shape in the inner diameter direction is provided so as to extend in the axial direction, whereby the outer peripheral wall surfaces around the connection portion receiving holes 21 a to 21 c are extended in the outer diameter direction. It has a protruding shape.

  On one end side in the circumferential direction of the connecting wall 30, auxiliary walls 31 are provided at two radial intervals in parallel with the inner peripheral wall 10 and the outer peripheral wall 20, thereby forming grooves 32 in the circumferential direction at three locations. Yes. Of the three grooves 32, the first groove 32 a is located closest to the inner peripheral wall 10, and the third groove 32 c is located closest to the outer peripheral wall 20. The second groove 32b is located between the first groove 32a and the third groove 32c. Slits 33 are respectively provided on the bottom surfaces of the grooves 32a to 32c.

  On the outer wall surface of the connecting wall 30, inverted L-shaped lead wire locking portions 34 a and 34 b are provided at positions close to the first connection portion storage hole 21 a and the second connection portion storage hole 21 b, respectively. . Each of the end portions of the grooves 32a to 32c is provided with two inverted L-shaped lead wire locking portions 35 on both sides thereof. That is, the lead wire locking portion 35 is provided on the circumferential end surface of the inner peripheral wall 10, the outer peripheral wall 20, and the auxiliary wall 31 on the side away from the connection portion receiving holes 21 a to 21 c.

  On the axial end surface 11 of the inner peripheral wall 10, five concave portions 12 are provided so as to extend in the radial direction at positions facing the concave portions 25 of the outer peripheral wall 20.

  The outer peripheral wall surface of the inner peripheral wall 10, the inner peripheral wall surface of the outer peripheral wall 20, and the inner wall surface of the connecting wall 30 form a coil end portion storage portion 40 that stores the coil end portion 3 a. Further, on the inner peripheral wall surface of the outer peripheral wall 20, convex portions 29 having a spring effect are provided at three locations.

[Action]
The stator cover 4 as described above is attached and fixed to the stator 1 so as to cover a part of the coil end portion 3a, and the coil end portion 3a is accommodated in the coil end portion accommodating portion 40. At this time, since the racing with the racing yarn 6 has not been performed yet, this fixing is only temporary fixing. Since the stator cover 4 is provided with the chamfered portion 26a, the stator cover 4 can be prevented from being caught by the winding of the coil end portion 3a during temporary fixing. Furthermore, since the convex portion 29 having a spring effect provided on the inner peripheral wall surface of the outer peripheral wall 20 comes into contact with the coil end portion 3a, the stator cover 4 can be temporarily fixed.

  After the stator cover 4 is temporarily fixed in this manner, a first-phase terminal wire (not shown) drawn from the coil 3 and a first lead wire 5a for flowing a current through the terminal wire A connection part (not shown) is stored in the first connection part storage hole 21a. Then, the terminal wire of the first phase and the first lead wire 5a are installed in the first recess 23a and the first groove 32a. At this time, the first lead wire 5a is locked to the stator cover 4 by the lead wire locking portions 24, 34a, and 35.

  In addition, a connection portion (not shown) between the second phase terminal wire (not shown) drawn from the coil 3 and the second lead wire 5b for allowing a current to flow through the terminal wire is the second. It is stored in the connection portion storage hole 21b. The terminal wire of the second phase and the second lead wire 5b are installed in the second recess 23b and the second groove 32b. At this time, the second lead wire 5 b is locked to the stator cover 4 by the lead wire locking portions 24, 34 b and 35.

  Further, a connection portion (not shown) between a third phase terminal wire (not shown) drawn from the coil 3 and a third lead wire 5c for passing a current through the terminal wire is a third portion. It is stored in the connection portion storage hole 21c. The terminal wire of the third phase and the third lead wire 5c are installed in the third recess 23c and the third groove 32c. At this time, the third lead wire 5 c is locked to the stator cover 4 by the lead wire locking portions 24 and 35.

  The connection part is usually formed by soldering. Even if there is a protrusion called a solder horn in this connection part, the radial cross-sectional shape of the connection part accommodation holes 21a to 21c is an ellipse, so that the connection part can be easily stored. That is, no horn removal work is required.

  In addition, since the groove 33 can be widened by opening the slit 33 provided in the grooves 32a to 32c, it is easy to install the lead wire 5 in the groove. Further, since the lead wire locking portions 24, 34 a, 34 b, 35 are provided on the stator cover 4, it is possible to prevent the installed lead wire 5 from floating from the stator cover 4.

  The stator cover 4 on which the lead wire 5 and the terminal wire of the coil 3 are installed is raced by the racing yarn 6 and fixed to the coil end portion 3a. At this time, the strength of the lacing can be increased by hooking the lacing yarn 6 on the recesses 12, 25, 27. At the same time, this racing closes the slit 33 by applying a force, so that the lead wire pull-out strength can be increased.

  By using the stator cover 4 as described above, unlike the conventional case, parts such as a temporary terminal block and a main terminal block are not required. Therefore, the manufacturing cost of the stator cover 4 can be reduced, and the entire stator can be downsized. it can.

[Other forms]
FIG. 5 is a cross-sectional view of the groove 32 of the stator cover 4 according to another embodiment. A lead wire 5 and a terminal wire of a coil (not shown) are installed in the groove 32. As shown in the drawing, an uneven portion 36 having a shape protruding from the bottom surface 32 t of the groove 32 can be provided. Since the concavo-convex portion 36 itself protrudes, the lead wire 5 is bent and the lead wire 5 contacts the concavo-convex portion 36, so that the pull-out strength of the lead wire 5 can be increased. Further, as shown in FIG. 6, the pull-out strength of the lead wire 5 can also be obtained by providing the auxiliary wall 31 constituting the grooves 32 a to 32 c, the outer peripheral wall surface of the inner peripheral wall 10, and the concave and convex portions 37 on the inner peripheral wall surface of the outer peripheral wall 20. Can be increased.

  As shown in FIG. 7, the second groove 32b can be provided at a position higher than the first groove 32a and the third groove 32c. Thereby, since the force applied to the grooves 32a to 32c can be equalized by racing using the racing yarn 6, the fixing strength of the three lead wires 5a to 5c can be equalized.

  As shown in FIG. 8, the connection portion storage hole 13 is also provided in the inner peripheral wall 10 in the axial direction, so that the connection portion between the terminal wire and the lead wire of more than three coils can be stored. Moreover, as shown in FIG. 9, a connection portion accommodation hole 38 can be provided on the outer wall surface of the connecting wall 30. Thereby, compared with the case where the connection part accommodation hole 21 is provided in the outer peripheral wall 20, the radial thickness of the outer peripheral wall 20 can be made small. Of course, the connection portion accommodation hole can be provided in at least one of the inner peripheral wall 10, the outer peripheral wall 20, and the connecting wall 30.

  As shown in FIG. 10, the groove 20 b can be formed along the circumferential direction by providing the circumferential auxiliary wall 20 a on the outer circumferential wall surface of the outer circumferential wall 20. In this case, a connection portion accommodation hole (not shown) can be provided in the circumferential direction on the outer peripheral wall 20 so as to face the groove 20b. Since the lead wire 5 and the terminal wire can be installed in the groove 20b similarly to the groove 32, the terminal wire and the lead wire of the coil exceeding three phases can be installed. In FIG. 10, the groove 32b is omitted.

  As shown in FIG. 11, the connection part accommodation holes 21a-21c can also be provided in the diagonal direction with respect to an axial direction. Thereby, the axial length of the outer peripheral wall 20 can be shortened.

  As shown in FIG. 12, a fitting portion 39 can be provided at one end in the circumferential direction of the connecting wall 30 of the stator cover 4. Thereby, it can be fitted to the fitting part 71 of the thermal protector mounting cover 7 as an example of another member, and the thermal protector mounting cover 7 can be integrated with the stator cover 4 and fixed to the coil end part 3a. The thermal protector mounting cover 7 is a cover for mounting a thermal protector (not shown) that prevents the temperature of the winding of the coil 3 from rising excessively. The thermal protector is stored in the thermal protector storage unit 72. The thermal protector mounting cover 7 is provided with a groove 73 and a slit 74 in the same manner as the groove 32 and the slit 33 of the stator cover 4. The lead wire of the thermal protector can be installed in the groove 73 and the slit 74.

  Alternatively, as shown in FIG. 13, the thermal protector mounting cover 7 may be provided with a fitting portion 75 extending in the axial direction and fitted to the inner peripheral wall surface of the inner peripheral wall 10 and the outer peripheral wall surface of the outer peripheral wall 20 of the stator cover 4.

  The shape of the groove 32 may be U-shaped or rectangular, but by making it U-shaped, the contact area with the lead wire 5 increases, and the varnish during impregnation adheres to the lead wire 5 and the groove 32. Therefore, the lead-out strength of the lead wire 5 can be increased.

  In addition, the connection part of a terminal wire and a lead wire is not restricted to the thing by soldering, You may be by a terminal or welding. Further, the stator cover 4 is not limited to the stator 1 of the AC motor, but can be used for a stator of a rotating electric machine including other types of electric motors and generators.

  In the above, specific embodiments of the terminal processing structure of a rotating electrical machine have been specifically described. However, the present invention is not limited to such an embodiment, and all changes and modifications apparent to those skilled in the art are included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Stator 2 Stator core 2a Motor rotating shaft direction end surface 3 Coil 3a Coil end part 4 Stator cover 5 Lead wire 5a 1st lead wire 5b 2nd lead wire 5c 3rd lead wire 6 Racing yarn 7 Thermal protector attachment cover 10 Inner peripheral wall 11 Axial end surface 12 Recess 13 Connection portion storage hole 20 Outer peripheral wall 20a Auxiliary wall 20b Groove 21 Connection portion storage hole 21a First connection portion storage hole 21b Second connection portion storage hole 21c Third connection portion storage hole 22 Axial end face 23a 1st dent 23b 2nd dent 23c 3rd dent 24 Lead wire locking part 25 Recess 26 Axial end face 26a Chamfer 27 Recess 28 Meat stealing 29 Protruding part 30 Connecting wall 31 Auxiliary wall 32 Groove 32a First groove 32b Second groove 32c Third groove 32t Bottom surface 33 Slits 34a, 34b Lead wire locking portion 35 De wire engaging portion 36 irregular portion 37 irregular portion 38 connecting portion receiving hole 39 fitting portion 40 the coil end portion housing portion 71 fitting portion 72 thermal protector housing section 73 groove 74 slits 75 fitting portion

Claims (13)

In the stator cover attached to the stator of the rotating electrical machine,
An inner peripheral wall and an outer peripheral wall corresponding to a part of each of the inner cylinder and the outer cylinder, which are coaxial cylinders, and a connecting wall that connects the inner peripheral wall and the outer peripheral wall;
At least one of the outer peripheral wall, the inner peripheral wall, and the outer wall surface of the connecting wall stores a connection portion between a terminal wire drawn from the coil of the stator and a lead wire that supplies current to the terminal wire. Connection part storage hole is provided,
The connecting wall is provided with an auxiliary wall in the circumferential direction, and the auxiliary wall, the inner peripheral wall surface of the outer peripheral wall, and the outer peripheral wall surface of the inner peripheral wall form a plurality of grooves in which the terminal wires and the lead wires are installed. A stator cover characterized by being made.   The stator cover according to claim 1, wherein a slit is provided on a bottom surface of the groove.   A lead wire locking portion is provided in at least one of the end portion of the groove, the outer wall surface of the connection wall, and a recess provided in the axial end surface of the outer peripheral wall so as to communicate with the connection portion receiving hole. The stator cover according to claim 1, wherein the stator cover is provided.   The stator cover according to any one of claims 1 to 3, wherein a cross-sectional shape in a radial direction of the connection portion accommodation hole 4 is an ellipse.   The stator cover according to any one of claims 1 to 4, wherein the connection portion accommodation hole is provided in the outer peripheral wall along the axial direction.   The stator cover according to any one of claims 1 to 4, wherein the connection portion accommodation hole is provided in the oblique direction with respect to the axial direction on the outer peripheral wall.   The stator cover according to any one of claims 1 to 6, wherein the connection portion accommodation hole 4 is provided in an outer wall surface of the connection wall along a circumferential direction.   The stator cover according to any one of claims 1 to 7, wherein the groove is provided in three places, and a central groove is provided at a position higher than the other grooves.   9. The uneven portion protruding from the bottom surface of the groove, the auxiliary wall forming the groove, the outer peripheral wall surface of the inner peripheral wall, and the inner peripheral wall surface of the outer peripheral wall is provided. The stator cover according to one item.   The stator cover according to any one of claims 1 to 9, wherein a chamfered portion is provided on an axial end surface of the outer peripheral wall.   The stator cover according to claim 1, wherein a convex portion having a spring effect is provided on an inner peripheral wall surface of the outer peripheral wall.   A circumferential auxiliary wall is also provided on the outer peripheral wall surface of the outer peripheral wall, whereby a plurality of grooves in which the terminal wires and the lead wires are installed are also formed on the outer peripheral wall surface of the outer peripheral wall. The stator cover according to any one of claims 1 to 11.   The stator cover according to claim 1, wherein a fitting portion for connecting another member is provided at one end in the circumferential direction of the connecting wall.

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