JP2020198767A - Electric motor - Google Patents

Abstract

To obtain an electric motor that can place phase-advancing capacitors with different capacities in a storage without changing dimensions of the storage even when an outer circumference of a case is changed.SOLUTION: An electric motor 100 includes a rotation shaft 4, a cylindrical rotor with the rotation shaft 4 connected inside, a stator having a coil arranged outside the rotor, a third terminal block 12 on which a concave capacitor storage 12a is formed, and a phase-advancing capacitor 13 arranged in the capacitor storage 12a of the third terminal block 12. The phase-advancing capacitor 13 includes a capacitor body 13a connected to a coil via the third terminal block 12 and a case 13b accommodating the capacitor body 13a. A hole is formed in the capacitor storage 12a. The case 13b is formed with a convex portion that fits into the hole.SELECTED DRAWING: Figure 7

Description

The present invention relates to an electric motor including a phase-advancing capacitor.

Conventionally, an electric motor provided with a phase-advancing capacitor is known. For example, Patent Document 1 describes an electric motor including a terminal block arranged on a bracket to form a concave accommodating portion and a phase-advancing capacitor arranged in the accommodating portion. The phase-advancing capacitor is housed in the case. In the technique described in Patent Document 1, the phase-advancing capacitor is fixed to the terminal block by making the outer peripheral dimension of the case and the dimension of the storage portion the same and fitting the case into the storage portion.

Japanese Unexamined Patent Publication No. 2006-314166

Generally, as the capacity of the phase-advancing capacitor increases, the outer peripheral dimension of the case also increases. In the configuration in which the phase-advancing capacitor is fixed to the terminal block by fitting the case into the storage portion as in Patent Document 1, it is necessary to change the size of the storage portion when the outer peripheral dimension of the case changes. Therefore, it is necessary to prepare a terminal block for each phase-advancing capacitor having a different capacitance.

The present invention has been made in view of the above, and an object of the present invention is to obtain an electric motor capable of arranging phase-advancing capacitors having different capacities in the storage portion without changing the dimensions of the storage portion even if the outer peripheral dimensions of the case are changed. And.

In order to solve the above-mentioned problems and achieve the object, the electric motor according to the present invention has a rotating shaft, a cylindrical rotor in which the rotating shafts are connected inward, and a coil arranged outside the rotor. It includes a stator to be provided, a terminal block in which a concave capacitor housing portion is formed, and a phase-advancing capacitor arranged in the capacitor housing portion of the terminal block. The phase-advancing capacitor has a capacitor body connected to the coil via a terminal block and a case for accommodating the capacitor body. A hole is formed in one of the case and the capacitor housing, and a convex portion that fits into the hole is formed in the other of the case and the capacitor housing.

According to the present invention, there is an effect that phase-advancing capacitors having different capacities can be arranged in the storage portion without changing the dimensions of the storage portion even if the outer peripheral dimensions of the case are changed.

Sectional drawing along the central axis of the electric motor according to Embodiment 1 of this invention A perspective view showing a stator of the electric motor according to the first embodiment. A perspective view showing a first terminal block of the electric motor according to the first embodiment. A perspective view showing an insulating member of the electric motor according to the first embodiment. A perspective view showing a bracket of the electric motor according to the first embodiment. A perspective view showing a second terminal block of the electric motor according to the first embodiment. A perspective view showing a state in which the cover of the electric motor according to the first embodiment is removed. A perspective view showing a third terminal block of the electric motor according to the first embodiment. Perspective view showing a phase-advancing capacitor A perspective view showing a state in which the phase-advancing capacitor shown in FIG. 9 is arranged on the third terminal block. A plan view showing a state in which the phase-advancing capacitor shown in FIG. 9 is arranged on the third terminal block. Sectional drawing along line XII-XII shown in FIG. A perspective view showing a phase-advancing capacitor smaller than the phase-advancing capacitor shown in FIG. A plan view showing a state in which the phase-advancing capacitor shown in FIG. 13 is arranged on the third terminal block.

Hereinafter, the electric motor according to the embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment.

Embodiment 1.
FIG. 1 is a cross-sectional view taken along the central axis C of the electric motor 100 according to the first embodiment of the present invention. FIG. 2 is a perspective view showing a stator 5 of the electric motor 100 according to the first embodiment. In FIG. 1, for easy understanding, only the conductive pin 14, the bracket 3, the insulating member 10, and the power supply lead wire 17 are hatched. In FIG. 2, the coil 5c is not shown.

The electric motor 100 according to the first embodiment includes a frame 1, a cover 2, a bracket 3, a rotating shaft 4, a stator 5, a rotor 6, a first bearing 7, and a second bearing 8. .. Further, the electric motor 100 includes a first terminal block 9, an insulating member 10, a second terminal block 11, a third terminal block 12, and a phase-advancing capacitor 13. The electric motor 100 is an internally rotating electric motor in which the rotor 6 rotates inside the stator 5. The rotating shaft 4, the stator 5, and the rotor 6 are coaxially provided. Hereinafter, when the direction of each component of the electric motor 100 will be described, the direction parallel to the central axis C of the electric motor 100 is the axial direction, the direction orthogonal to the central axis C of the electric motor 100 is the radial direction, and the central axis C of the electric motor 100 is described. The direction of rotation around the center is the circumferential direction.

The frame 1 and the cover 2 are metal members that form the outer shell of the electric motor 100. A stator 5, a rotor 6, and the like are housed inside the frame 1 and the cover 2. The frame 1 and the cover 2 are formed in a bottomed cylindrical shape in which one end is opened along the axial direction. The frame 1 and the cover 2 are arranged so that the openings face each other. A first bearing housing 1a for holding the first bearing 7 is formed on the bottom wall of the frame 1. A through hole 1b through which the rotating shaft 4 is inserted is formed inside the bottom wall of the frame 1 in the radial direction with respect to the first bearing housing 1a. A frame flange 1c extending radially outward is formed at the opening edge of the frame 1. A cover flange 2a extending radially outward is formed at the opening edge of the cover 2.

The bracket 3 is a metal member that divides the internal space of the electric motor 100 formed by the frame 1 and the cover 2 into two in the axial direction. A stator 5, a rotor 6, a rotating shaft 4, a first terminal block 9, and the like are arranged in the internal space formed by the bracket 3 and the frame 1. A second terminal block 11, a third terminal block 12, a phase-advancing capacitor 13, and the like are arranged in the internal space formed by the bracket 3 and the cover 2. The bracket 3 is fitted inside the cover 2. The bracket 3 is formed in a bottomed cylindrical shape with one end opening along the axial direction. A second bearing housing 3a for holding the second bearing 8 is formed on the bottom wall 3c of the bracket 3. A bracket flange 3b extending radially outward is formed at the opening edge of the bracket 3. The bracket flange 3b is sandwiched between the frame flange 1c and the cover flange 2a. The frame flange 1c, the cover flange 2a, and the bracket flange 3b are fixed to each other with bolts (not shown).

The rotation shaft 4 is a member that serves as the rotation center of the rotor 6. One end 4a along the axial direction of the rotating shaft 4 projects to the outside of the frame 1 through the through hole 1b. The other end 4b along the axial direction of the rotating shaft 4 projects to the outside of the frame 1 through the opening of the frame 1 and reaches the inside of the bracket 3. A load (not shown) is connected to one end 4a of the rotating shaft 4. Hereinafter, one direction along the axial direction of the rotating shaft 4, that is, one end 4a side of the rotating shaft 4 is referred to as a load side, and the other direction along the axial direction of the rotating shaft 4, that is, the other end 4b of the rotating shaft 4 The side may be called the anti-load side.

The rotor 6 is a cylindrical member in which the rotating shaft 4 is connected inward. The rotor 6 can rotate about the rotation shaft 4. The slot of the rotor 6 is filled with a secondary conductor 6a made by die-casting aluminum.

The stator 5 is a cylindrical member arranged outside the rotor 6. A gap (not shown) is provided between the rotor 6 and the stator 5 over the entire circumference. The stator 5 is press-fitted into the frame 1. The stator 5 has a stator core 5a, an insulator 5b which is a winding frame, and a coil 5c which is a stator winding.

The stator core 5a is formed by laminating a plurality of thin electromagnetic steel sheets. As shown in FIG. 2, the stator core 5a has a cylindrical core back 5d and a plurality of teeth 5e protruding inward in the radial direction from the inner peripheral surface of the core back 5d. The plurality of teeth 5e are provided at equal angles along the circumferential direction. A stator slot 5f through which a magnet wire (not shown) is inserted is provided between the teeth 5e adjacent to each other in the circumferential direction. Each tooth 5e is covered with an insulator 5b.

A magnet wire is wound around each tooth 5e via an insulator 5b to form a coil 5c shown in FIG. 1. A conductive pin 14 extends in a direction away from the insulator 5b on the surface of the insulator 5b facing the counterload side. Although not shown, a part of the coil 5c is wound around the conductive pin 14 a plurality of times. The conductive pin 14 and the coil 5c are electrically connected by soldering. The conductive pin 14 is electrically connected to the power supply lead wire 17 connected to the external power supply by soldering.

The coil 5c is composed of a centralized winding in which magnet wires are passed through two stator slots 5f adjacent to each other. The centralized winding can have a smaller dimension along the axial direction of the coil 5c than the distributed winding in which the magnet wires are passed through the stator slots 5f separated by two or more. Therefore, if the coil 5c configured by centralized winding is used, the size of the electric motor 100 along the axial direction can be reduced. In the electric motor 100, by using the coil 5c composed of the centralized winding, the size along the axial direction is the same as that in the case of using the coil 5c composed of the distributed winding while mounting the phase-advancing capacitor 13. Is possible.

As shown in FIG. 1, the two first bearings 7 and the second bearing 8 are bearings that rotatably support the rotor 6. The first bearing 7 and the second bearing 8 are arranged on both sides of the rotor 6 in the axial direction. The first bearing 7 is arranged on the load side of the rotor 6. The first bearing 7 is held in the annular first bearing housing 1a. The first bearing housing 1a is formed by bending a part of the frame 1 so as to be convex toward the counterload side. The second bearing 8 is arranged on the opposite load side of the rotor 6. The second bearing 8 is held in the annular second bearing housing 3a. The second bearing housing 3a is formed by bending a part of the bracket 3 so as to be convex toward the load side.

The first terminal block 9 is arranged on the surface of the insulator 5b facing the counterload side. The first terminal block 9 is formed in a cylindrical shape. The first terminal block 9 is made of an insulating material such as resin. The first terminal block 9 is arranged between the bracket 3 and the coil 5c on the counterload side in the axial direction. The first terminal block 9 is arranged on the outer side in the radial direction of the second bearing housing 3a. The first terminal block 9 and the second bearing housing 3a are coaxially provided. The inner diameter of the first terminal block 9 is formed to be substantially equal to the outer diameter of the second bearing housing 3a. A second bearing housing 3a is press-fitted inside the first terminal block 9. The first terminal block 9 is formed with a through hole 9a through which the conductive pin 14 is inserted.

FIG. 3 is a perspective view showing a first terminal block 9 of the electric motor 100 according to the first embodiment. A plurality of first terminal board accommodating portions 9b and a plurality of fuse accommodating portions 9c are formed on the surface of the first terminal block 9 facing the opposite load side. The first terminal plate accommodating portion 9b and the fuse accommodating portion 9c are formed in a concave shape recessed on the load side. The plurality of first terminal plate accommodating portions 9b are arranged so as to be spaced apart from each other along the circumferential direction. The first terminal plate 15 is arranged in the first terminal plate storage portion 9b. The depth of the first terminal plate accommodating portion 9b is formed to be larger than the plate thickness of the first terminal plate 15. As a result, the first terminal plate 15 does not protrude from the opening of the first terminal plate storage portion 9b to the counterload side. A thermal fuse 16 is arranged in the fuse housing portion 9c. The thermal fuse 16 is a device for preventing excessive temperature rise of the coil 5c shown in FIG.

The first terminal plate 15 is formed with a through hole 15a through which the conductive pin 14 is inserted. The conductive pin 14 projects from the through hole 9a of the first terminal block 9 and the through hole 15a of the first terminal plate 15 to the counterload side. In the first terminal block 9, electrical connections such as a conductive pin 14 connected to the coil 5c, a conductive pin 14 connected to the power lead wire 17, a thermal fuse 16, and electronic components mounted inside the electric motor 100 are provided. This is done using the first terminal board 15. The conductive pin 14 and the first terminal plate 15 are electrically connected by soldering or welding. The thermal fuse 16 and the first terminal plate 15 are electrically connected by soldering or welding.

As shown in FIG. 1, the insulating member 10 is a member of the first terminal block 9 arranged on a surface facing the counterload side and a side surface. The insulating member 10 is formed in a cylindrical shape. The insulating member 10 is arranged between the bracket 3 and the first terminal block 9 in the axial direction. The insulating member 10 is arranged on the outer side in the radial direction of the second bearing housing 3a. The insulating member 10 and the second bearing housing 3a are provided coaxially. The inner diameter of the insulating member 10 is formed to be substantially equal to the outer diameter of the second bearing housing 3a. A second bearing housing 3a is press-fitted inside the insulating member 10.

FIG. 4 is a perspective view showing the insulating member 10 of the electric motor 100 according to the first embodiment. The insulating member 10 has a flat portion 10a, a side wall portion 10b, and a plurality of protruding portions 10c. The flat portion 10a is a flat portion formed in an annular shape. The side wall portion 10b extends from the outer peripheral portion of the flat portion 10a to the load side. The side wall portion 10b is formed in a cylindrical shape. The protruding portion 10c protrudes from the flat portion 10a to the counterload side. The protruding portion 10c is formed in a cylindrical shape. The plurality of projecting portions 10c are arranged so as to be spaced apart from each other along the circumferential direction. As shown in FIG. 1, the flat portion 10a covers the surface of the first terminal block 9 facing the counterload side. The outer diameter of the flat portion 10a is formed to be substantially equal to the outer diameter of the first terminal block 9. The side wall portion 10b covers the side surface of the first terminal block 9. The inner diameter of the side wall portion 10b is formed to be substantially equal to the outer diameter of the first terminal block 9. A conductive pin 14 is inserted inside the protrusion 10c.

FIG. 5 is a perspective view showing a bracket 3 of the electric motor 100 according to the first embodiment. A plurality of through holes 3e are formed in the bottom wall 3c of the bracket 3. The plurality of through holes 3e are arranged so as to be spaced apart from each other along the circumferential direction. As shown in FIG. 1, the conductive pin 14 and the protruding portion 10c of the insulating member 10 are inserted into the through hole 3e. The surface 3d of the bracket 3 facing the opposite load side is a substantially flat surface.

The second terminal block 11 is arranged on the surface 3d of the bracket 3 facing the counterload side. The second terminal block 11 is made of an insulating material such as resin. The second terminal block 11 and the bracket 3 are provided coaxially. The second terminal block 11 has a bottom wall portion 11a and a peripheral wall portion 11b. The bottom wall portion 11a covers the surface 3d of the bracket 3 facing the opposite load side. The outer diameter of the bottom wall portion 11a is formed to be substantially equal to the outer diameter of the bracket 3. The bottom wall portion 11a is formed with a through hole 11c through which the conductive pin 14 and the protruding portion 10c are inserted.

FIG. 6 is a perspective view showing a second terminal block 11 of the electric motor 100 according to the first embodiment. The second terminal block 11 is formed in the shape of a circular shallow bottom container. The bottom wall portion 11a is formed in an annular shape. A plurality of second terminal plate accommodating portions 11d are formed on the surface of the bottom wall portion 11a facing the opposite load side. The plurality of second terminal plate accommodating portions 11d are arranged so as to be spaced apart from each other along the circumferential direction. The second terminal plate accommodating portion 11d is formed in a concave shape recessed on the load side. The second terminal plate 18 is arranged in the second terminal plate storage portion 11d. The depth of the second terminal plate accommodating portion 11d is formed to be larger than the plate thickness of the second terminal plate 18. As a result, the second terminal plate 18 does not protrude from the opening of the second terminal plate accommodating portion 11d to the counterload side. The second terminal plate 18 is formed with a through hole 18a through which the conductive pin 14 is inserted. The conductive pin 14 projects from the through hole 11c of the second terminal block 11 and the through hole 18a of the second terminal plate 18 to the counterload side.

A plurality of power supply lead wire accommodating grooves 11e are formed on the surface of the bottom wall portion 11a facing the opposite load side. The power supply lead wire 17 shown in FIG. 1 is arranged in the power supply lead wire storage groove 11e. The power supply lead wire 17 connects the second terminal plate 18 and an external power supply (not shown). The depth of the power supply lead wire accommodating groove 11e is formed to be equal to or larger than the outer diameter of the power supply lead wire 17. As a result, the power supply lead wire 17 does not protrude to the opposite load side from the opening of the power supply lead wire storage groove 11e. The depth and groove width of each power supply lead wire accommodating groove 11e are preferably set to a size that allows only one power supply lead wire 17 to fit. In the second terminal block 11, the conductive pin 14 and the power supply lead wire 17 are electrically connected by using the second terminal plate 18. The conductive pin 14 and the second terminal plate 18 are electrically connected by soldering or welding. The power lead wire 17 and the second terminal plate 18 are electrically connected by soldering or welding.

The peripheral wall portion 11b extends from the outer peripheral portion of the bottom wall portion 11a to the counterload side. The peripheral wall portion 11b is formed in a cylindrical shape. A notch 11f for passing the power supply lead wire 17 is formed in a part of the peripheral wall portion 11b. The power lead wire accommodating groove 11e extends from the notch 11f to the second terminal plate accommodating portion 11d. The power supply lead wire 17 is led out from the notch portion 11f to the outside of the second terminal block 11. The second terminal block 11 shown in FIG. 1 is covered with a cover 2. As a result, various parts arranged on the second terminal block 11 are protected. The cover 2 is provided with a mouth portion 2b for pulling out the power supply lead wire 17 to the outside of the cover 2.

The third terminal block 12 is arranged on the surface of the bottom wall portion 11a facing the opposite load side. The third terminal block 12 is made of an insulating material such as resin. The third terminal block 12 and the second terminal block 11 are provided coaxially. The outer diameter of the third terminal block 12 is formed to be substantially equal to the inner diameter of the second terminal block 11. The third terminal block 12 is arranged inside the second terminal block 11. A through hole 12d through which the conductive pin 14 is inserted is formed in the third terminal block 12. The third terminal block 12 is covered with a cover 2. As a result, various parts arranged on the third terminal block 12 are protected.

FIG. 7 is a perspective view showing a state in which the cover 2 of the electric motor 100 according to the first embodiment is removed. FIG. 8 is a perspective view showing a third terminal block 12 of the electric motor 100 according to the first embodiment. The third terminal block 12 is formed in a disk shape. One capacitor housing portion 12a and two third terminal plate storage portions 12b are formed on the surface of the third terminal block 12 facing the opposite load side. As shown in FIG. 8, the capacitor accommodating portion 12a is formed in a concave shape recessed on the load side. The third terminal board storage portion 12b is formed so as to be surrounded by a wall extending from the third terminal block 12 to the counterload side. The capacitor accommodating portion 12a and the third terminal plate accommodating portion 12b are open to the opposite load side. The capacitor storage portion 12a and the third terminal plate storage portion 12b communicate with each other at a part of the wall. A hole 12c is formed in the bottom wall 12e of the capacitor housing portion 12a. The hole 12c is formed in a shape into which the convex portion 13g, which will be described later, fits. The position of the hole 12c is not particularly limited, but in the present embodiment, it is formed at the boundary between the bottom wall 12e of the capacitor storage portion 12a and the wall communicating with the third terminal plate storage portion 12b. The hole 12c is provided in the center of the capacitor housing portion 12a along the width direction of the bottom wall 12e. The size of the capacitor accommodating portion 12a is formed so that the phase-advancing capacitor 13 having the largest outer peripheral size among the phase-advancing capacitors 13 mountable on the electric motor 100 can be fitted.

The third terminal plate accommodating portion 12b is provided adjacent to the capacitor accommodating portion 12a. The two third terminal plate storage portions 12b are separated from each other. The opening area of the third terminal plate storage portion 12b is smaller than the opening area of the capacitor storage portion 12a. A third terminal plate 19 is arranged in the third terminal plate storage portion 12b. The depth of the third terminal plate accommodating portion 12b is formed to be larger than the plate thickness of the third terminal plate 19. As a result, the third terminal plate 19 does not protrude from the opening of the third terminal plate storage portion 12b to the counterload side. The third terminal plate 19 is formed with a through hole 19a through which the conductive pin 14 is inserted. The conductive pin 14 projects from the through hole 12d of the third terminal block 12 and the through hole 19a of the third terminal plate 19 to the counterload side.

FIG. 9 is a perspective view showing the phase-advancing capacitor 13. As shown in FIG. 9, the phase-advancing capacitor 13 is a capacitor lead wire that is electrically connected to the capacitor body 13a, the case 13b that houses the capacitor body 13a, and the capacitor body 13a, and projects from the inside to the outside of the case 13b. It has 13c and. The shape of the case 13b is not particularly limited, but is a rectangular parallelepiped shape in the present embodiment. The case 13b has a first wall portion 13d, a second wall portion 13e facing the opposite side of the first wall portion 13d, and an outer peripheral wall portion 13f connecting the first wall portion 13d and the second wall portion 13e. The first wall portion 13d is formed with a convex portion 13g that fits into the hole 12c. The shape of the convex portion 13g is not particularly limited, but is formed in a rectangular parallelepiped shape in the present embodiment. In the present embodiment, the convex portion 13g is formed at the boundary between the first wall portion 13d and the outer peripheral wall portion 13f. The convex portion 13g is provided at the center along the width direction of the first wall portion 13d. Two capacitor lead wires 13c are arranged at intervals along the width direction of the case 13b. The capacitor lead wire 13c projects outward through a hole (not shown) formed in the outer peripheral wall portion 13f. The two capacitor lead wires 13c project from one wall portion 13m forming the outer peripheral wall portion 13f.

FIG. 10 is a perspective view showing a state in which the phase-advancing capacitor 13 shown in FIG. 9 is arranged on the third terminal block 12. FIG. 11 is a plan view showing a state in which the phase-advancing capacitor 13 shown in FIG. 9 is arranged on the third terminal block 12. FIG. 12 is a cross-sectional view taken along the line XII-XII shown in FIG. In FIG. 12, the capacitor body 13a is not shown. As shown in FIGS. 10 and 11, the phase-advancing capacitor 13 is arranged in the capacitor accommodating portion 12a. As shown in FIG. 12, the case 13b is arranged so that the first wall portion 13d faces the bottom wall 12e of the capacitor housing portion 12a. The convex portion 13g is fitted in the hole 12c with the phase-advancing capacitor 13 arranged in the capacitor housing portion 12a. As shown in FIG. 11, the third terminal plate 19 extends along the wall portion 13m of the outer peripheral wall portion 13f of the case 13b. In the third terminal block 12, the conductive pin 14 and the capacitor lead wire 13c drawn from the case 13b are electrically connected by using the third terminal plate 19. The conductive pin 14 and the third terminal plate 19 are electrically connected by soldering or welding. The capacitor lead wire 13c and the third terminal plate 19 are electrically connected by soldering or welding. The capacitor body 13a is connected to the coil 5c shown in FIG. 1 via the capacitor lead wire 13c, the third terminal plate 19 of the third terminal block 12, and the conductive pin 14.

Next, the operation and effect of the electric motor 100 will be described with reference to FIGS. 9, 11, 13, and 14. FIG. 13 is a perspective view showing a phase-advancing capacitor 13 smaller than the phase-advancing capacitor 13 shown in FIG. FIG. 14 is a plan view showing a state in which the phase advance capacitor 13 shown in FIG. 13 is arranged on the third terminal block 12. Here, a case where each of two types of phase-advancing capacitors 13 having different outer peripheral dimensions is arranged on the third terminal block 12 will be described as an example. Hereinafter, when distinguishing between the two phase-advancing capacitors 13, one phase-advancing capacitor 13 having a large outer peripheral size is referred to as a large phase-advancing capacitor 13A, and the other phase-advancing capacitor 13 having a smaller outer peripheral size is referred to as a small phase-advancing capacitor 13B. It may be called. The capacitor body 13a of the large phase-advancing capacitor 13A may be referred to as the large capacitor body 13h, and the capacitor body 13a of the small phase-advancing capacitor 13B may be referred to as the small capacitor body 13i. The case 13b of the large phase-advancing capacitor 13A may be referred to as a large case 13j, and the case 13b of the small phase-advancing capacitor 13B may be referred to as a small case 13k.

In the present embodiment, the phase-advancing capacitor 13 can be fixed to the third terminal block 12 by fitting the convex portion 13g of the case 13b into the hole 12c of the capacitor housing portion 12a. Further, as shown in FIGS. 11 and 14, the size of the capacitor housing portion 12a is formed to be the same as the outer peripheral size of the large case 13j of the large phase advance capacitor 13A. As a result, the large phase-advancing capacitor 13A shown in FIG. 11 and the small phase-advancing capacitor 13B shown in FIG. 14 can be arranged in the capacitor accommodating portion 12a having the same dimensions. That is, even if the outer peripheral dimension of the case 13b is changed according to the capacity of the capacitor main body 13a, the phase-advancing capacitors 13 having different capacities can be arranged in the capacitor housing portion 12a without changing the dimensions of the capacitor housing portion 12a. Therefore, it is not necessary to manufacture the third terminal block 12 for each phase-advancing capacitor 13 having a different capacitance, and the labor and cost required for manufacturing the third terminal block 12 can be suppressed.

In the configuration in which the phase-advancing capacitor 13 is fixed to the third terminal block 12 by fitting the case 13b into the capacitor storage portion 12a as in Patent Document 1, the capacitor storage portion is used even when a small capacitor main body 13i having a small capacity is used. It is necessary to form the case 13b so as to come into contact with the wall surface of 12a. On the other hand, in the present embodiment, the phase-advancing capacitor 13 can be fixed to the third terminal block 12 by fitting the convex portion 13g of the case 13b into the hole 12c of the capacitor housing portion 12a, so that the compact phase-advancing capacitor 13B can be fixed. It is not necessary to make the case 13b unnecessarily large. As a result, the amount of material used to form the case 13b of the compact phase-advancing capacitor 13B can be reduced as compared with the case of Patent Document 1.

Further, when trying to arrange the phase-advancing capacitor 13 having the same capacity as that of the large-sized phase-advancing capacitor 13A in the capacitor accommodating portion 12a formed in the size corresponding to the outer peripheral dimension of the small phase-advancing capacitor 13B, the capacitor accommodating portion It is necessary to stack a plurality of phase-advancing capacitors 13 having an outer peripheral dimension that fits in 12a, or to increase the thickness dimension of the phase-advancing capacitor 13 to increase the capacity of the phase-advancing capacitor 13. On the other hand, in the present embodiment, the capacitor accommodating portion 12a is formed in a size corresponding to the outer peripheral dimension of the large case 13j of the large phase advancing capacitor 13A. Therefore, even when a large-sized phase-advancing capacitor 13A having a larger capacity than the small-sized phase-advancing capacitor 13B is arranged in the capacitor housing 12a, a plurality of phase-advancing capacitors 13 are stacked or the thickness of the phase-advancing capacitor 13 is increased. There is no need to increase the capacitance of the phase capacitor 13. As a result, it is possible to suppress the increase in size of the cover 2 covering the phase-advancing capacitor 13 along the axial direction and suppress the increase in size of the electric motor 100 along the axial direction. Further, it is not necessary to manufacture the cover 2 for each of the phase-advancing capacitors 13 having different capacities, and the labor and cost required for manufacturing the cover 2 can be suppressed.

In the present embodiment, the size of the capacitor storage portion 12a is formed to be the same as the outer peripheral size of the large case 13j of the large phase advance capacitor 13A, so that the large case 13j can be fitted into the capacitor storage portion 12a. it can. As a result, the large phase-advancing capacitor 13A can be more firmly fixed by the third terminal block 12.

In the present embodiment, the third terminal block 12 is provided with a third terminal plate 19 that is electrically connected to the conductive pin 14 and the capacitor lead wire 13c. As a result, the conductive pin 14 is electrically connected to the phase advance capacitor 13 via the third terminal plate 19.

In the present embodiment, the capacitor lead wire 13c protrudes from the outer peripheral wall portion 13f of the case 13b, and the third terminal plate 19 extends along the outer peripheral wall portion 13f of the case 13b. As a result, as shown in FIGS. 11 and 14, even if the positions of the capacitor lead wires 13c are changed due to the difference in the outer peripheral dimensions of the case 13b, the capacitor lead wires 13c and the third terminal plate 19 of each phase-advancing capacitor 13 are changed. It enables electrical connection with.

In the present embodiment, two types of phase-advancing capacitors 13 having different capacities and outer peripheral dimensions have been described as examples, but the types of phase-advancing capacitors 13 that can be mounted on the electric motor 100 according to the present embodiment are limited. Not the purpose. The shapes of the convex portion 13g and the hole 12c are rectangular parallelepiped in the present embodiment, but may be changed as appropriate. Further, a convex portion may be formed on the bottom wall 12e of the capacitor accommodating portion 12a so as to project toward the phase-advancing capacitor 13, and a hole for fitting the convex portion may be formed in the case 13b of the phase-advancing capacitor 13.

The configuration shown in the above-described embodiment shows an example of the content of the present invention, can be combined with another known technique, and is one of the configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

1 frame, 1a 1st bearing housing, 1b, 3e, 9a, 11c, 12d, 15a, 18a, 19a through hole, 1c frame flange, 2 cover, 2a cover flange, 2b outlet, 3 bracket, 3a second bearing Housing, 3b bracket flange, 3c, 12e bottom wall, 3d surface, 4 rotating shaft, 4a one end, 4b other end, 5 stator, 5a capacitor core, 5b insulator, 5c coil, 5d core back, 5e teeth, 5f Capacitor slot, 6 Rotor, 6a Secondary conductor, 7 1st bearing, 8 2nd bearing, 9 1st terminal block, 9b 1st terminal plate storage, 9c Fuse storage, 10 Insulation member, 10a Flat part 10b Side wall, 10c protruding part, 11 2nd terminal block, 11a bottom wall part, 11b peripheral wall part, 11d 2nd terminal plate storage part, 11e power lead wire storage groove, 11f notch, 12 3rd terminal block, 12a Capacitor storage, 12b 3rd terminal plate storage, 12c hole, 13-phase capacitor, 13A large phase-advancing capacitor, 13B small-phase-advancing capacitor, 13a capacitor body, 13b case, 13c capacitor lead wire, 13d first wall, 13e 2nd wall, 13f outer wall, 13g convex, 13h large capacitor body, 13i small capacitor body, 13j large case, 13k small case, 13m wall, 14 conductive pin, 15 1st terminal plate, 16 thermal fuse , 17 Power lead wire, 18 2nd terminal plate, 19 3rd terminal plate, 100 Electric motor, C center axis.

Claims (3)

The axis of rotation and
A cylindrical rotor with the rotating shaft connected inward, and
A stator located outside the rotor and having a coil,
A terminal block with a concave capacitor housing and
A phase-advancing capacitor arranged in the capacitor housing of the terminal block is provided.
The phase-advancing capacitor has a capacitor body connected to the coil via the terminal block and a case for accommodating the capacitor body.
A hole is formed in either the case or the capacitor housing.
An electric motor characterized in that a convex portion fitted in the hole is formed in any one of the case and the capacitor accommodating portion. When one direction along the axial direction of the rotating shaft is the load side and the other direction along the axial direction of the rotating shaft is the anti-load side, the counter load side is closer to the rotor and the stator. With additional brackets placed
The terminal block is arranged on the opposite load side of the bracket.
The capacitor housing portion is recessed on the load side.
The stator has an iron core and
The coil is wound around the iron core via a winding frame.
The winding frame is provided with a conductive pin extending to the counterload side.
The phase-advancing capacitor has a capacitor lead wire that is electrically connected to the capacitor body and projects from the inside to the outside of the case.
The electric motor according to claim 1, wherein a terminal plate electrically connected to the conductive pin and the capacitor lead wire is arranged on the terminal block. The capacitor lead wire protrudes from the outer peripheral wall portion of the case.
The electric motor according to claim 2, wherein the terminal plate extends along an outer peripheral wall portion of the case.

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