JP3414879B2 - Half-pitch motor stator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a half pitch type electric motor which is divided into a yoke portion and a plurality of tooth portions, and after winding a winding around each tooth portion, the yoke portion and the tooth portions are combined and formed. Regarding the stator.

[0002]

2. Description of the Related Art In recent years, in order to facilitate the processing of a winding wire, a bobbin wound with a winding wire is divided into a tooth part which is divided into a yoke part on the outer diameter side and a tooth part forming a slot. After mounting, it is formed by combining tooth parts to the yoke part, winding one-phase one-pole winding on one tooth part, and having a stator with the same total number of tooth parts and windings The development of the stator of the pitch type electric motor is in progress.

Conventionally, a stator of this type of half-pitch type electric motor will be described with reference to FIG.

As shown in the figure, a yoke portion 102 having a ring shape and a plurality of dovetail grooves 101 formed on the inner surface, and a yoke portion 1 at the root portion.
No. 2 has a dovetail 103 that engages with a dovetail groove 101 formed at 02, and has a rotor facing surface at its tip end.
After the stator iron core formed by the tooth portion 105 formed with 04 is laminated by a predetermined method, the winding wire 106 is formed on the tooth portion 105.
The hard bobbin 107 wound with the
After engaging the dovetail 103 provided on the ridge 103 with the dovetail groove 101 formed in the yoke portion 102 to engage the yoke portion 102 and the tooth portion 105, the winding 106 and the pole shoe portion 104 are insulated. The wedge 108 was provided in the slot 109 to form the stator of the half pitch type electric motor.

[0005]

In the structure of the stator of the conventional half-pitch type motor as described above, the yoke portion 102 and the tooth portion 105 are connected to each other by the dovetail groove 101 formed in the yoke portion 102 and the tooth portion. Since it is performed by the dovetail 103 formed on the portion 105, there is a problem that the contact area between the yoke portion 102 and the tooth portion 105 is small and the magnetic resistance is large, resulting in poor efficiency. Further, the yoke portion 102 has a dovetail groove 101.
However, since the dovetail 103 must be provided on the tooth portion 105, the die for core removal becomes complicated and the cost becomes high, and the positioning of the yoke portion 102 and the tooth portion 105 is required, so positioning is performed. There was a problem that a jig was required and workability was poor.

A bobbin 107 around which the winding 106 is wound.
The winding 106 was constructed by attaching the wire to the tooth portion 105, but it is necessary to provide the wedge 108 inside the slot 109 in order to secure the insulation distance between the winding 106 and the pole shoe portion 104. There was a problem of poor sex.

The root side of the tooth portion 105 is the tooth portion 105.
Since the winding 106 is formed in the same width as the tooth 106 and the winding 106 cannot be directly wound around the tooth portion 105, a hard bobbin 107 on which the winding 106 is wound must be used, and a hard bobbin 107 is provided. Therefore, there is a problem that the space factor of the winding 106 in the slot 109 is reduced.

Further, among the magnetic fluxes generated by the windings 106, the magnetic flux flowing through the central portion of the tooth portion 105 and the magnetic flux flowing through the left and right pole shoe portions 104 are equal, so that the magnetomotive force per tooth portion is equal. There is a problem that the motor efficiency is poor because the waveform is far from the sine waveform.

The present invention solves the above problems, and simplifies the die for core removal by eliminating the unevenness that joins the yoke portion and the tooth portion formed by dividing the core of the stator to reduce the cost. In addition, it is possible to fix the half-pitch type electric motor with a structure in which the teeth can be fitted and assembled to the inner surface of the yoke without circumferential positioning with respect to the yoke, and the core of the stator can be integrated. The primary purpose is to provide children.

A second object is to increase the contact area between the yoke and the teeth formed by dividing the core of the stator to reduce the magnetic resistance and improve the motor efficiency.
It is to strengthen and integrate the mechanical strength of the yoke portion and the tooth portion.

A third object of the present invention is to secure an insulation distance between the winding wire, the tooth portion and the yoke portion to eliminate the need for a wedge and to reduce the number of assembling steps.

A fourth object is to eliminate the need for the bobbin and increase the space factor of the winding in the slot.

A fifth object is to bring the magnetomotive force waveform close to a sine wave to improve efficiency.

A sixth object is to bring the magnetomotive force waveform close to a sine wave to improve the efficiency and to secure the mechanical strength of the pole shoe portion.

[0015]

A first means for achieving the first object of the present invention is to provide a core of a stator, which has an annular surface for fitting a tooth portion inside thereof, and has a non-divided annular shape. A pole shoe having a yoke portion formed on the outside, a connecting portion having a fitting surface for fitting the inside surface of the yoke portion outside the root portion, a half slot shape formed inside and a tip end having a rotor facing surface. A plurality of tooth portions each having a toothed portion, and the connecting portions of the toothed portions largely project to the left and right in the circumferential direction, and the connecting portions of the tooth portions that are adjacent to each other in the circumferential direction are in contact with each other, but are not divided. The yoke portion is formed in an annular shape and is annularly arranged and fitted and held to be assembled and integrated.

A second means for achieving the second object is to divide the yoke into a plurality of parts by forming a tooth-connecting convex portion on the inner surface of the yoke portion formed in a non-divided annular shape. The connecting portion on the outer side of the tooth portion is provided with a concave portion that fits into the convex portion on the inner surface of the yoke portion,
The convex portions of the yoke portion are fitted and assembled with the concave portions of the tooth portions, respectively, to secure a large contact area of the fitting surface between the yoke portion and the tooth portions and to firmly integrate them.

A third means for achieving the third object is to cover the half-slot shaped portion of the tooth portion and to have a collar portion between the connecting portions and on the pole shoe portion side, and one side of the collar portion. A connecting part and a projecting piece projecting from the brim part of the pole shoe part, and a bobbin formed of a soft insulating resin and a winding wound around this bobbin, and the tooth part is used as a yoke part. When mounted, the protruding pieces provided on the bobbin of the tooth portion adjacent to the collar portion formed on the bobbin overlap each other.

A fourth means for achieving the fourth object is to apply a winding by applying an insulating resin coating on the surface of the tooth portion excluding the mating surface with the yoke portion and the rotor facing surface. The configuration is

Further, a fifth means for achieving the fifth object is such that a slot of the pole shoe portion provided in the tooth portion is provided with a notch inclined toward the central portion of the tooth portion. .

The sixth means for achieving the sixth object is to provide a hole for restricting the flow of magnetic flux in the pole shoe portion from the inside of the width of the tooth portion between the joint portion and the pole shoe portion. The configuration.

[0021]

According to the present invention, by the construction of the above-mentioned first means, the circumferential end faces of the connecting portions of the tooth portions adjacent to each other in the circumferential direction are mutually opposed to the entire inner surface of the non-divided annular yoke portion. The entire outer surface is fitted and held while abutting against, and by eliminating the unevenness of the inner peripheral surface of the yoke portion and the outer peripheral surface of the tooth portion, the die without core becomes simple. Costs are reduced,
Further, the tooth portion can be fitted and assembled to the inner surface of the yoke portion without positioning in the circumferential direction with respect to the yoke portion, and the assembly can be simplified.

Further, according to the structure of the second means, the contact area of the yoke portion and the tooth portion at the time of fitting is greatly increased, and each tooth portion is fitted and fixed by the convex portion of the yoke portion. As the motor efficiency increases, the yoke portion and the tooth portion are more firmly assembled and integrated.

Further, according to the structure of the third means, since the protruding piece is superposed on the collar portion provided on the bobbin, the insulation distance between the tooth portion and the yoke portion and the winding can be secured, and the wedge is unnecessary and the assembly is performed. The man-hours will be reduced.

Further, according to the structure of the fourth means, since the inside of the slit is insulated by the thin film, the space factor of the winding in the slit can be increased and the inside of the slit can be effectively utilized.

Further, according to the structure of the fifth means, among the magnetic fluxes generated by being excited by the windings wound around the teeth, the magnetic flux flowing in the circumferential direction of the rotor facing surface is restricted, and the magnetic flux on the center line side is limited. As the magnetic flux increases, the magnetomotive force waveform approaches a sine wave, improving motor efficiency.

Further, with the structure of the sixth means, the motor efficiency can be improved by making the magnetomotive force waveform close to a sine wave while ensuring the mechanical strength of the pole shoe portion formed on the tooth portion.

[0027]

EXAMPLE 1 Example 1 of the present invention will be described below with reference to FIG. As shown in the drawing, the yoke portion 2A formed in a non-divided and annular shape, the arcuate fitting surface 3 that fits on the outside, and the circumferential direction so as to form a half shape of the slot 5 inside this A plurality of tooth portions 9 each having a connecting portion 6A protruding leftward and rightward and a rotor facing surface 7 formed on a pole shoe portion 8 at a tip portion thereof are provided.
A forms a stator core with A, and tooth portions 9A in which circumferential ends of connecting portions 6A provided on the outer peripheral side of the tooth portions 9A are adjacent to each other.
The contact portions 6A come into contact with each other at their circumferential ends, and at the same time, the outer peripheral surface of the connecting portion 6A is fitted and held on the inner peripheral annular surface of the yoke portion 2A.

In the above structure, the yoke portion 2A and the tooth portion 9A
After being laminated to a predetermined size, the winding 11 is wound around the slot 5 of the tooth 9A via the insulating material 10 and formed on the connecting portion 6A on the outer peripheral side of the wound tooth 9A of the winding 11. The tooth portion 9 is formed so that the fitted fitting surface 3 matches the inner surface of the yoke portion 2A.
When A is arranged in an annular shape, the end portions in the circumferential direction of the connecting portions 6A of the adjacent tooth portions 9A come into contact with each other, and the tooth portions 9A are abutted against each other by the abutting force. Mating surface 3
Is held and fixed to.

As described above, according to the stator of the half-pitch type electric motor of the first embodiment of the present invention, the tooth portions 9A are formed by the circumferential end surfaces of the connecting portions 6A of the adjacent tooth portions 9A abutting each other. Since it is held on the inner surface of the yoke portion 2A, it is not necessary to provide a concave portion or a convex portion on the inner peripheral surface of the yoke portion 2A and the outer peripheral surface of the tooth portion 9A, and the core punching of the yoke portion 2A and the tooth portion 9A is not necessary. The structure of the mold is simplified and cost can be reduced,
Positioning of the tooth portion 9A with respect to the yoke portion 2A becomes unnecessary,
The need for positioning jigs is eliminated and assembly workability is improved.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

As shown in the drawing, an annular yoke portion 2 having a plurality of coupling projections 1 on the inner surface, and an arc-shaped fitting surface 3 and the yoke portion 2 which are fitted to the outside. Convex portion 1 formed on
It is configured to have a concave portion 4 that is coupled to.

In the above structure, the recessed portion 4 of the tooth portion 9 of the winding 11 is engaged with the protruding portion 1 of the yoke portion 2 so that the yoke portion 2 is formed.
The fitting surface 3 formed on the inner surface of the outer surface of the connecting portion 6 of the tooth portion 9
The yoke portion 2 and the tooth portion 9 are joined together in close contact with each other to form a stator.

As described above, according to the stator of the half-pitch type electric motor of the second embodiment of the present invention, the concave portion 1 of the yoke portion 2 and the convex portion 4 of the tooth portion 9 are fitted together, and the yoke portion is formed. Since the fitting surface 3 of the connecting portion 6 formed larger than the width of the tooth portion 9 is closely fitted to the inner surface of the yoke 2, the yoke portion 2 and the tooth portion 9 are firmly integrated, and the yoke portion 2 and The contact area of the tooth portion 9 becomes large, the magnetic resistance is reduced, the magnetic flux easily passes, and the motor efficiency improves.

(Third Embodiment) A third embodiment of the present invention will be described below with reference to FIGS. 3 and 4. The same parts as those in the second embodiment are designated by the same reference numerals and detailed description thereof will be omitted in each of the following embodiments.

As shown in the drawing, a flange 12 is provided on the side of the connecting portion 6A and the side of the pole shoe portion 8 so as to cover the half-slot shaped portion of the tooth portion 9A, and the connecting portion 6A and the pole are provided on one side of the flange portion 12. A bobbin 14 is formed by forming a projecting piece 13 projecting from the end of the shoe portion 8 with a soft insulating resin, and winding 11 is wound around the bobbin 14.

In the above structure, the tooth portions 9A are arranged in an annular shape so that the fitting surface 3 formed on the connecting portion 6A of the tooth portion 9A matches the inner surface of the yoke portion 2A. At this time, bobbin 14
The protruding pieces 13 formed so as to project from the collar portion 12 are arranged on the adjacent tooth portion 9A in a state of being overlapped with the collar portion 12 of the bobbin 14 and fitted and held on the inner surface of the yoke portion 2A.

As described above, according to the stator of the half pitch type electric motor of the present invention, the tooth portion 9A for winding the winding wire 11 is wound.
The protrusion 13 formed on one side of the flange 12 of the bobbin 14 provided on the bobbin 1 is provided on the adjacent tooth 9A.
Since it overlaps with the collar portion 12 of No. 4, the insulation distance between the yoke portion 2A and the connecting portion 6A of the tooth portion 9A and the winding 11 with respect to the pole shoe portion 8 can be secured, and it is necessary to install a wedge that maintains insulation. Assembling becomes easy and the number of assembling steps is reduced.

(Embodiment 4) A fourth embodiment of the present invention will be described below with reference to FIGS. 5 and 6. As shown in the figure, a resin film 15 is formed by coating the entire surface of the tooth portion 9A except the fitting surface 3 fitted to the inner surface of the yoke portion 2A and the rotor facing surface 7 with an insulating resin.
And winding 11A on the tooth portion 9A on which the resin film 15 is formed.
Is directly wound.

In the above structure, the teeth 9A are arranged in a ring so that the fitting surface 3 formed on the connecting portion 6A of the teeth 9A matches the inner surface of the yoke 2A, and the teeth 9A are fitted into the yoke 2A. The connecting portions 6A formed on the mating tooth portions 9A come into contact with each other and the tooth portions 9A
A is retained. Then, a wedge 16 formed of an insulating material is inserted between the winding 11A and the connecting portion 6 of each tooth 9A and between the pole shoes 8 to secure an insulation distance from the winding 11A.

As described above, according to the stator of the half-pitch electric motor of the fourth embodiment of the present invention, the tooth portion 9A around which the winding 11A is wound is covered with the thin resin film 15. The area occupied by the resin film 15 in the slot 5 is small, and almost the shape of the slot 5 can be used as the space for the winding 11A, and the space factor can be reduced. Therefore, the amount of the winding 11A can be increased and the output can be increased. can do.

(Fifth Embodiment) A fifth embodiment of the present invention will be described below with reference to FIGS. 7 to 9.

As shown in the drawing, the pole shoe portion 8A formed on the tooth portion 9B is provided with a notch 17 which is inclined toward the center of the tooth portion 9B on the slot 5 side.

In the above structure, the tooth portion 9B around which the winding wire 11 is wound via the bobbin 18 is annularly arranged in the yoke portion 2A to form a stator. When the winding 11 is energized,
The magnetic flux flowing in the circumferential direction of the rotor hole out of the magnetic flux generated by the winding 11 is limited by the notch 17, the magnetic flux flowing toward the center increases, and the magnetic force waveform (A) becomes a sine waveform. You will be approaching. When the notch 17 is not provided, the magnetomotive force waveform (B) is obtained.

As described above, according to the stator of the half-pitch electric motor of the present invention, the magnetic flux flowing in the circumferential direction of the rotor hole in the tooth portion 9B is limited by the notch 17, and the magnetomotive force waveform (A) is sinusoidal. The waveform can be approximated and the efficiency of the electric motor can be improved.

(Sixth Embodiment) A sixth embodiment of the present invention will be described below with reference to FIGS. 10 to 12. As shown in the figure, the pole shoe portion 8B closer to the inner diameter than the width of the tooth portion 9C between the connecting portion 6A and the pole shoe portion 8B is provided with a hole 19 for restricting the flow of magnetic flux.

In the above structure, the tooth portion 9C around which the winding wire 11 is wound via the bobbin 18 is annularly arranged in the yoke portion 2A to form a stator. When the winding 11 is energized, of the magnetic flux generated by being excited by the winding 11, the magnetic flux flowing in the circumferential direction of the rotor hole is restricted by the hole 19,
The magnetic flux flowing toward the center increases, and the magnetomotive force waveform (A) approaches a sine waveform. In addition, the magnetomotive force waveform when the hole 19 is not provided is in the state of (B).

As described above, according to the stator of the half-pitch type motor of the present invention, the magnetic flux flowing in the circumferential direction of the rotor hole at the end 9C is limited by the hole 19, and the magnetomotive force waveform (A) is a sine waveform. In addition to improving the efficiency of the electric motor, the mechanical strength of the pole shoe portion 8B is secured as compared with the notch provided for limiting the magnetic flux.

[0048]

As is apparent from the above-described embodiments, according to the present invention, the yoke portion is formed in a non-divided annular shape, and the yoke portion is arranged in an annular shape via the connection portion fitted to the inner surface of the yoke portion. Since the tooth portion is provided with the tooth portion, and the tooth portion is held by the connecting portions provided on the tooth portions abutting each other on the connecting portions of the adjacent ends, there is no need for unevenness to connect the yoke portion and the tooth portion It is possible to provide a stator of a half-pitch type electric motor that simplifies the structure of the die, reduces the cost, and eliminates the need for positioning the tooth portion with respect to the yoke portion and facilitates assembly.

In addition, an annular yoke portion having a plurality of coupling projections on the inner surface, a fitting surface to be fitted to the inner surface of the yoke portion and a recess to be coupled to the projection are provided outside the root portion. And a toothed portion that is formed in the shape of a half-slot on the inside and has a protruding portion to the left and right and a pole shoe portion that has a rotor facing surface at the tip, and the width of the connecting portion. Since it is configured to be larger than the width of the portion and the area of the fitting surface that comes into contact with the yoke portion is configured to be large, it is possible to provide the stator of the half-pitch electric motor that can reduce the magnetic resistance and improve the efficiency.

Further, the connecting portion side and the pole shoe portion side are provided with a flange portion in a shape to cover the half-slot shaped portion of the tooth portion, and one side of the collar portion protrudes from the end portion of the connecting portion and the pole shoe portion. And a bobbin formed of a soft insulating resin and a winding wound around the bobbin, and when the tooth portion is attached to the yoke portion, the tooth portion is adjacent to the collar portion formed on the bobbin. Since it is configured to overlap with the protruding piece provided on the bobbin of the tooth portion, the insulation distance between the winding wire and the tooth portion and the yoke portion is secured, the wedge is unnecessary, and the number of assembling steps can be reduced. .

Further, since the insulating resin is coated on the surface of the tooth portion excluding the mating surface with the yoke portion and the surface facing the rotor to construct the winding, the bobbin becomes unnecessary and the winding in the slot is eliminated. It is possible to increase the space factor and increase the winding amount to increase the output.

Further, since the notch inclined toward the center of the tooth portion is provided on the slot side of the pole shoe portion provided on the tooth portion, the magnetomotive force waveform approaches a sine waveform and the efficiency of the motor is improved. .

Further, since holes for restricting the flow of magnetic flux are provided in the pole shoe portion from the inside of the width of the tooth portion between the joint portion and the pole shoe portion, the pole shoe portion is raised while ensuring the mechanical strength. The magnetic force waveform approaches a sine waveform and the efficiency of the motor improves.

[Brief description of drawings]

FIG. 1 is a sectional view showing a state of a core of a stator of a half pitch type electric motor of a first embodiment of the invention.

FIG. 2 is a sectional view showing a state of a stator of the half pitch type electric motor of the second embodiment.

FIG. 3 is a cross-sectional view showing a state of a bobbin wound with windings of a stator of a half pitch type electric motor of the third embodiment.

FIG. 4 is a partially cutaway front view showing a superposed state of a collar portion and a protruding piece in the bobbin of the third embodiment.

FIG. 5 is an enlarged view showing a state in which the stator of the fourth embodiment is resin-coated.

FIG. 6 is an enlarged view showing a winding state of a stator according to the fourth embodiment.

FIG. 7 is a front view showing a core state of a tooth portion of a stator according to the fifth embodiment.

FIG. 8A is a magnetomotive force waveform diagram when the notch of the fifth embodiment is provided. FIG. 8B is a magnetomotive force waveform diagram when the notch is not provided.

FIG. 9 is a sectional view showing a part of a stator of the fifth embodiment.

FIG. 10 is a sectional view showing a part of a stator of the sixth embodiment.

FIG. 11 is a front view showing a core state of tooth portions of a stator of the sixth embodiment.

FIG. 12 (a) is a magnetomotive force waveform diagram when the hole of the sixth embodiment is provided, and (b) is a magnetomotive force waveform diagram when the hole is not provided.

FIG. 13 is a sectional view showing a state of a core of a stator of a conventional half pitch type electric motor.

[Explanation of symbols]

1 convex part 2, 2A Yoke part 3 Mating surface 4 recess 5 slots 6,6A connection 7 Rotor facing surface 8, 8A, 8B Pole shoe part 9, 9A, 9B, 9C Teeth 11, 11A winding 12 collar part 13 protruding piece 14 bobbins 15 Resin film

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Claims (6)

(57) [Claims] 1. A core of a stator is internally provided with a ring for fitting a tooth portion.
A yoke portion formed annularly undivided have Jo surface, connected to have a mating surface that fits into the yoke portion inner surface on the outside of the root portion
Part and a plurality of teeth with a pole shoe part having a rotor facing surface and a half-slot shape formed inside
To become the connecting portion of the teeth mutually adjacent to each largely protrudes circumferentially in the circumferential direction right and left connecting portions of the teeth in contact with each other
However, the ring is formed on the inner surface of the non-divided annular yoke part.
A stator of a half-pitch type electric motor, which is arranged in a shape, is fitted and held, and is assembled and integrated . 2. The inside of the yoke portion formed in a ring shape without division .
A tooth part that has a convex part for connecting tooth parts on the surface and is divided into multiple parts
The outer connecting part is provided with a concave part that fits into the convex part on the inner surface of the yoke part.
Provide the recesses of the teeth with the protrusions of the yoke.
Assembled together to increase the contact area of the mating surface between the yoke and teeth
The stator of a half-pitch electric motor according to claim 1, which is configured to be secured and firmly integrated . 3. A protruding piece which has a collar portion between the connecting portions and on the pole shoe portion side in a shape that covers the half-slot shaped portion of the tooth portion, and which protrudes from the connecting portion and the collar shoe portion of the pole shoe portion on one side of the collar portion. And a bobbin formed of a soft insulating resin and a winding wound around the bobbin, and when the tooth portion is attached to the yoke portion, the tooth portion is adjacent to the collar portion formed on the bobbin. The stator of a half-pitch electric motor according to claim 1 or 2, wherein a protruding piece provided on the bobbin of the tooth portion is superposed. 4. The half-pitch type electric motor according to claim 1, wherein the surface of the tooth portion excluding the mating surface of the yoke portion and the surface of the tooth portion excluding the rotor facing surface is coated with an insulating resin to construct a winding. Stator. 5. The half-pitch type electric motor according to claim 1, wherein the slot of the pole shoe portion provided in the tooth portion is provided with a notch inclined toward the center portion of the tooth portion. stator. 6. The structure according to claim 1, 2, 3 or 4, wherein a hole for limiting the flow of magnetic flux is provided in the pole shoe portion at a position closer to the inner side than the width of the tooth portion between the joint portion and the pole shoe portion. Half-pitch type electric motor stator.