JP2014166096A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine capable of installing terminal boxes at a plurality of positions without additional use of a dedicated terminal box fixture.SOLUTION: The rotary electric machine includes terminal box installation seat 18 for terminal box installation at a plurality of different positions in the radial direction in view of the axial direction of a rotating shaft 10 in a frame 1 for storing a stator 5. Each of the plurality of terminal box installation seats 18 has a separable section, separation by which forms an opening section.

Description

  Embodiments described herein relate generally to a rotating electrical machine.

  In a rotary electric machine, for example, an induction motor, a terminal box mounting seat for mounting a terminal box is generally provided on the outer surface side of a frame that houses a stator. The terminal box is necessary to connect the lead wire of the stator coil and the power supply power supply line. Conventionally, the terminal box mounting seat is provided only at one position of the frame, for example, on the left side when viewed from the end portion for load connection in the axial direction of the rotating shaft. However, depending on the installation location of the rotating electrical machine, there is a demand to install the terminal box on the right side or the upper side when viewed from the axial direction of the rotating shaft, but it cannot be easily handled. there were.

  In order to deal with such a situation, for example, a terminal box fixture is detachably attached to the frame, and the terminal box is removed from the axial direction of the rotary shaft by selecting the mounting position of the terminal box fixture. A device that can be installed on either the left side, the right side, or the upper side is considered. However, in this case, since a dedicated terminal box fixture is required separately, there is a problem that the cost increases.

JP-A-8-182244

  Therefore, a rotating electrical machine that can easily change the mounting position of a terminal box without using a dedicated terminal box mounting tool separately is provided.

  According to the rotating electrical machine of the present embodiment, the terminal box mounting seats for mounting the terminal box are provided at a plurality of locations in the frame that accommodates the stator and having different radial directions when viewed from the axial direction of the rotating shaft.

The front view which looked at the rotary electric machine (induction motor) by this embodiment from the axial direction of the rotating shaft. Fracture left side view of a rotating electrical machine shown partially broken Front view of terminal box mounting seat Enlarged sectional view of the terminal box mounting seat

  Hereinafter, the rotating electrical machine according to the present embodiment will be described with reference to the drawings. In this case, the rotating electric machine is an induction motor. As shown in FIG. 2, the frame 1 of the induction motor is manufactured by, for example, aluminum die casting, and has a substantially cylindrical shape in the horizontal direction. In this frame 1, bearing brackets 2 and 3 are fixedly attached by bolts 4 to both left and right ends of FIG.

  A stator 5 is accommodated and fixed inside the frame 1. The stator 5 includes an annular stator core 6 fixed to the inner peripheral portion of the frame 1 and a stator coil 7 wound around a slot portion of the stator core 6. A rotor 8 is disposed inside the stator 5. The rotor 8 includes a rotating shaft 10 at the center of the rotor core 9, and the rotating shaft 10 is rotatably held by bearings 11 and 12 provided on the bearing brackets 2 and 3. An air gap is formed between the outer peripheral surface of the rotor core 9 and the inner peripheral surface of the stator core 6. The rotor 8 is provided with an internal fan 13. The internal fan 13 protrudes from the rotor core 9 in the axial direction. The internal fan 13 rotates integrally with the rotor 8, and generates a blowing action in the frame 1 along with the rotation to cool the inside.

  Both ends in the axial direction of the rotary shaft 10 protrude outward from the bearing brackets 2 and 3. An external fan 14 is attached to the left end 10a of FIG. 2 among both ends of the rotating shaft 10, and a load is connected to the right end 10b of FIG. A fan cover 15 that covers the external fan 14 is attached to the outside of the left bearing bracket 2 in FIG. The fan cover 15 is provided with an intake section 16. The external fan 14 sucks air outside the fan cover 15 from the intake portion 16 into the fan cover 15 as it rotates, and flows the sucked air along the outer surface of the frame 1 from the outer surface of the bearing bracket 2. Cool the outside of the frame 1.

  Legs 17 are provided at the bottom of the frame 1. Terminal box mounting seats 18 are provided at a plurality of locations on the outer periphery of the frame 1. As shown in FIG. 1, the terminal box mounting seat 18 has a plurality of locations different in the radial direction when viewed from the end 10 b on the load connection side in the axial direction of the rotating shaft 10, in this case, the left side, the right side, and the top Are provided at three locations. Each terminal box mounting seat 18 is provided integrally with the frame 1. Since the three terminal box mounting seats 18 have basically the same configuration, only one configuration will be described. The terminal box mounting seat 18 has a quadrangular cylindrical shape protruding outward, and the distal end is closed by a closing portion 19. As shown in FIG. 3 and FIG. 4, a separable portion 20 that is formed thinner than the portion of the closing portion 19 is provided in a groove shape around the closing portion 19. The thickness t1 of the separable portion 20 is set to 0.8 mm or less, for example. For this reason, by applying a jig and hitting the closing part 19 with a hammer or the like, the closing part 19 can be divided by the separable part 20 and separated. By removing the blocking portion 19, an opening can be formed in the terminal box mounting seat 18. Thereby, the terminal box mounting seat 18 can be validated. A plurality of rib-shaped heat radiation fins 21 are provided on the outer periphery of the frame 1. Each radiation fin 21 extends along the axial direction of the rotary shaft 10.

  When assembling the induction motor having the above-described configuration, the position for attaching the terminal box is determined in advance, and the blocking portion 19 of the terminal box mounting seat 18 at the determined position is broken among the three terminal box mounting seats 18 of the frame 1. To remove and form an opening. Thus, one terminal box mounting seat 18 out of the three terminal box mounting seats 18 is activated. When assembling the induction motor, a lead wire (not shown) of the stator coil 7 is drawn through the opening. And the terminal box 22 (refer the dashed-two dotted line of FIG. 1) is attached to the terminal box mounting seat 18 in which the opening part was formed. In the state of FIG. 1, the terminal box 22 is shown attached to the terminal box mounting seat 18 on the right side of the frame 1 when viewed from the end 10 b on the load connection side in the axial direction of the rotating shaft 10. The lead wire of the stator coil 7 is drawn into the terminal box 22. Then, when the induction motor is installed at a place where the induction motor is used, in the terminal box 21, a power supply power line (not shown) is connected to the lead wire of the stator coil 7, thereby Can be used.

  In the above-described embodiment, in the frame 1 of the induction motor, the terminal box mounting seats 18 are provided at a plurality of locations having different radial directions when viewed from the axial direction of the rotary shaft 10, in this case, the left side, the right side, and the upper side. Therefore, according to the installation location of the induction motor, it is possible to easily meet the requirements by enabling one terminal box mounting seat 18 of the three terminal box mounting seats 18. Therefore, the mounting position of the terminal box 22 can be easily changed. In this case, since a dedicated terminal box fixture is not required separately, an increase in cost can be suppressed.

  The three terminal box mounting seats 18 are all closed by the closing portion 19 when the frame 1 is molded, and the opening portion is formed by removing the closing portion 19 at a necessary location. It is not necessary to block the opening of the terminal box mounting seat 18 later. Moreover, since the thin separable part 20 is formed around each blocking part 19, the blocking part 19 can be easily removed and an opening can be easily formed.

(Other embodiments)
As the position of the terminal box mounting seat 18, for example, the terminal box mounting seat 18 may be provided at an upper left side or an upper right side as long as it is at a plurality of locations having different radial directions when viewed from the end 10 b on the load connection side in the axial direction of the rotating shaft 10. It may be.
The shape of the terminal box mounting seat 18 is not limited to a rectangular tube shape, and may be a cylindrical shape.
The present invention is not limited to an electric motor, and can be applied to a generator.

  As described above, according to the rotating electrical machine of the present embodiment, the terminal box mounting seats for mounting the terminal box are provided at a plurality of locations that are different in the radial direction when viewed from the axial direction of the rotating shaft in the frame that houses the stator. ing. For this reason, according to the installation place of a rotary electric machine, it can respond to a request | requirement easily by validating one terminal box mounting seat of the multiple terminal box mounting seats. Therefore, the mounting position of the terminal box can be easily changed. In this case, since a dedicated terminal box fixture is not required separately, an increase in cost can be suppressed.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  In the drawings, 1 is a frame, 5 is a stator, 7 is a stator coil, 8 is a rotor, 10 is a rotary shaft, 18 is a terminal box mounting seat, 19 is a closing portion, 20 is a separable portion, and 22 is a terminal. Show the box.

Claims (2)

  A rotating electric machine comprising a terminal box mounting seat for mounting a terminal box at a plurality of locations having different radial directions when viewed from the axial direction of the rotating shaft.   The rotating electric machine according to claim 1, wherein each of the plurality of terminal box mounting seats has a separable portion, and the opening is formed by being separated by the separable portion.

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