JP5987161B2 - Electric motor and ceiling fan equipped with the same - Google Patents

Description

  The present invention relates to a motor including a stator core having a plurality of teeth arranged radially and a pair of upper and lower insulators mounted so as to be sandwiched from above and below in the axial direction.

  Conventionally, in this type of electric motor, a proper insulation treatment is applied to an integral stator core, and two-phase windings are wound concentrically. (For example, refer to Patent Document 1).

  Hereinafter, the electric motor will be described with reference to FIGS.

  As shown in the figure, the stator core 100 has a hole 101 for holding a hollow shaft in the center, and a plurality of first tooth portions 102 in the vicinity of the outer periphery thereof, and extends from the first tooth portions 102 in a bifurcated direction in the outer peripheral direction. And the second tooth portion 103. The first tooth portion 102 and the second tooth portion 103 form a first slot 104 around which the A-phase winding 109 is wound, and a second slot 105 around which the B-phase winding 110 is wound.

  In order to electrically insulate the windings (A-phase winding 109, B-phase winding 110) and the stator core 100, the insulators 111a and 111b are sandwiched in advance from the axial direction as shown in FIGS. And attached to the stator core 100. The A-phase winding 109 and the B-phase winding 110 are wound around the first tooth portion 102 and the second tooth portion 103 that are insulated by the insulators 111a and 111b.

  The insulators 111a and 111b are formed of, for example, an insulating resin material, and include a plurality of parts divided by the first slot 104. The insulators 111a and 111b are mounted in the axial direction and overlapped in the first slot 104 and the second slot 105. A combined configuration is shown.

JP 2009-71913 A

  However, such a conventional electric motor has the following problems.

  Although not shown in the figure, in a split-type insulator divided by a slot wall surface, the upper and lower insulators are rotated on the inner wall portion of the slot in order to secure a space insulation distance between the wound winding and the stator core. It is necessary not only to superimpose in the axial direction but also to superimpose only a predetermined dimension at the joint portion of the insulator adjacent in the circumferential direction.

  Further, in the conventional example shown in FIG. 11, the insulators 111a and 111b have a structure 123 that overlaps in the circumferential direction on the inner wall portion of the first slot 104, and the resin wall thickness of the slot inner wall portion becomes thicker, Since the slot area around which the wire (A-phase winding 109, B-phase winding 110) is wound is narrowed, the circumferential length of the winding (A-phase winding 109, B-phase winding 110) becomes long. As a result, the electrical resistance of the winding increases, and the efficiency of the motor decreases. Further, the number of parts increases and the number of assembly steps increases.

  In order to solve this problem, a method is conceivable in which the insulators are formed in an annular shape and overlapped as a pair of upper and lower sides. However, since the height of the wall portion extending in the axial direction is uniform when inserted into the slot, it is necessary to insert the wall portion into the first slot 104 and the second slot 105 at the same time. It becomes very difficult to increase the positioning accuracy of the insulator, and the insertion and fitting operations are not performed sufficiently smoothly.

  The present invention solves such a conventional problem and can improve the insertion workability and the fitting workability of the insulator while ensuring sufficient insulation performance, saving power and reducing production costs. An object of the present invention is to provide an electric motor capable of performing the above.

The electric motor of the present invention is
A stator core having a plurality of first slots for applying an A-phase winding and a plurality of second slots for applying a B-phase winding, and a rotor attached rotatably to the side surface of the stator core. An electric motor,
The stator core is
The first slot for providing the A-phase winding on the inner peripheral side is provided in an annular shape,
The second slot for applying the B-phase winding to the outer peripheral side of the first slot is provided in an annular shape,
A pair of upper and lower insulators (insulator A, insulator B) are mounted so as to be sandwiched from above and below in the axial direction,
This insulator
Each made of synthetic resin,
A base composed of a plane perpendicular to the rotation axis;
It is composed of a plurality of cylindrical wall portions extending in the rotation axis direction from the base portion so as to cover the wall surfaces of the first slot and the second slot,
Each wall portion provided corresponding to the second slot on the outer peripheral side ,
It is composed of three types of first wall, second wall, and third wall with different heights from the base,
The highest first wall portion of the insulator A and the lowest third wall portion of the insulator B are opposed to each other,
The second wall portion of the insulator A and the second wall portion of the insulator B are opposed to each other,
The lower third wall portion of the insulator A and the highest first wall portion of the insulator B are opposed to each other and attached to the stator core.
All wall portions provided corresponding to the first slot on the inner peripheral side are:
The height from the base is lower than that of the first wall .

  By this means, when the insulator is mounted on the stator core, the positioning of the insulator is completed when the highest first wall portion with respect to the base portion is inserted into the first slot or the second slot. By inserting the remaining second wall portion and third wall portion into the first slot or the second slot, the insulator can be easily attached.

  According to the electric motor of the present invention, the insulator extends in the direction of the rotational axis from the base so as to cover the base configured by a surface orthogonal to the rotational axis and the wall surfaces of the first slot and the second slot. The plurality of wall portions are constituted by three kinds of first wall portions, second wall portions, and third wall portions having different heights from the base portion, and the insulator. Is mounted on the stator core, the highest first wall portion of the insulator A and the lowest third wall portion of the insulator B are opposed to each other, and the second wall portion of the insulator A and the second wall portion of the insulator B are Since the two wall portions are opposed to each other and the lowest third wall portion of the insulator A and the highest first wall portion of the insulator B are opposed to each other, insertion is facilitated to prevent damage to the insulator and improve quality. The figure It is possible.

Overall configuration diagram showing a ceiling fan equipped with the electric motor according to Embodiment 1 of the present invention Sectional drawing which shows the whole structure of the same motor Sectional drawing of the partial fracture which shows the stator of the same motor An exploded perspective view of the stator of the same motor The perspective view of the state which looked at the insulator A of the same motor from the stator core side The perspective view of the state which looked at the insulator B of the same motor from the stator core side (A) sectional view of wall portion of insulator A, (b) sectional view of wall portion of insulator B of the same motor DD sectional drawing which shows the fitting state of the insulator A of the same motor, and the insulator B Plan view showing a stator core of a conventional electric motor Top view of the stator after winding of the motor winding Perspective view of split insulator of the same motor The top view which shows the circumferential direction junction part of the split type insulator of the same motor

An electric motor according to the present invention includes a stator core having a plurality of first slots for applying an A-phase winding and a plurality of second slots for applying a B-phase winding, and is rotatably attached to a side surface of the stator core. An electric motor equipped with a rotor,
A pair of upper and lower insulators (insulator A and insulator B) are attached to the stator core so as to be sandwiched from above and below in the axial direction, and the insulator includes a base portion configured by a surface orthogonal to the rotation axis, and the first slot And a plurality of cylindrical wall portions extending from the base portion in the direction of the rotation axis so as to cover the wall surface of the second slot, and the plurality of wall portions have three different heights from the base portion. The insulator is composed of a first wall portion, a second wall portion, and a third wall portion, and the insulator makes the highest first wall portion of the insulator A and the lowest third wall portion of the insulator B opposite to each other, The second wall portion of the insulator A and the second wall portion of the insulator B are opposed to each other, and the lowest third wall portion of the insulator A and the highest first wall portion of the insulator B are opposed to each other. It is intended to be attached to the stator core Te.

  By this means, when the insulator is mounted on the stator core, the first wall portion having a high height from the base portion is first inserted into the slot (first slot or second slot) of the stator core for positioning. Become. That is, it is not necessary to insert all the wall portions into the slot at once, and since the second wall portion and the third wall portion are inserted into the slot after positioning, it is easy to install the insulator and the assembly workability is improved. To do.

  Further, the stator core is provided with the first slot for providing the A-phase winding on the inner peripheral side in an annular shape, and the second slot for providing the B-phase winding on the outer peripheral side of the first slot. It is. As described above, since the slots are doubled on the inner and outer peripheries and the number of slots is increased, the insulator of the present application having a high wall portion can be easily inserted into the stator core.

  In addition, since the first wall portion and the third wall portion are provided in at least three locations, the insulator is positioned in a flat surface, and mounting is facilitated.

  In addition, since a part of the wall portion corresponding to the second slot is the first wall portion and the third wall portion, the first wall portion to be inserted first into the second slot on the outer peripheral side. Since the positioning is performed, the insertion position can be confirmed while visually checking.

  The height of the second wall portion from the base portion is about ½ of the axial thickness of the stator core, and the height of the first wall portion from the base portion is the stator. With a configuration that is higher than 1/2 of the axial thickness of the iron core, and the height of the third wall portion from the base is lower than 1/2 of the axial thickness of the stator core, Insulator A and insulator B can have the same configuration.

  Further, since the stator iron core is provided with a small positioning hole, and the insulator is provided with a positioning projection that fits into the small hole, it can be easily matched with the insulator A and the insulator B. The

  Further, since the small hole is provided on the inner peripheral side of the first slot, the small hole can be positioned without obstructing the winding or affecting the rotor.

  The insulator A and the insulator B are each made of a synthetic resin integrally formed in an annular shape. This means eliminates the need for a structure in which the circumferentially adjacent insulator joints are overlapped, which is necessary for a split-type insulator divided by a slot wall surface, so that the slot area is widened and the winding circumference is increased. The electrical resistance of the winding can be reduced, the efficiency of the electric motor can be improved, and the number of parts can be reduced.

  Such an electric motor is suitable for a large abduction motor having a large number of poles, such as used for a ceiling fan. That is, since the ceiling fan uses a propeller type impeller with a large blade diameter, a large torque is required and the number of poles is increased. Therefore, an electric motor using a large number of slots and using an insulator as in the present application is suitable.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 shows a side view of a ceiling fan on which the electric motor according to Embodiment 1 of the present invention is mounted. The ceiling fan 1 is a fan attached to the ceiling, is also called a ceiling fan, and uses an electric motor 2 as a drive source. The column 4 is fixed downward on the ceiling, and a hollow shaft 6 is connected to the column 4, and the electric motor 2 including the blade 3 is attached to the tip of the column 4. The electric motor 2 is covered with a main body cover 5 and an upper cover 11.

  FIG. 2 is a cross-sectional view showing the overall configuration of the electric motor 2. This motor 2 is an abduction type capacitor induction motor, and a hollow shaft 6 is provided with an A-phase winding 8 (inner coil) and a B-phase winding via a pair of upper and lower insulators 7 (insulator A7a, insulator B7b). A stator core 16 provided with 9 (outer coil) is fixed. A rotor core 17 is provided around the hollow shaft 6 with a gap around the stator core 16. The rotor core 17 is press-fitted and held in the rotor cover 12 to form an abduction type rotor. The rotor cover 12 and the upper cover 11 are provided with bearing housing portions 13a and 13b, and are rotatably attached to the hollow shaft 6 via the bearing portions 14a and 14b.

  FIG. 3 is a partially broken cross-sectional view showing the stator of the electric motor 2, and FIG. 4 is an exploded perspective view of the stator of the electric motor 2. The stator core 16 is formed by laminating a plurality of electromagnetic steel plates in the axial direction, and has a center hole 21 for press-fitting and holding the hollow shaft 6 at the center thereof, and radially around the outer periphery of the center hole 21 at equal intervals. 1st tooth part 22 which winds up A phase winding 8 located in 2nd, and the 2nd tooth part which extends from the 1st tooth part 22 to the perimeter direction, and winds B phase winding 9 23. Moreover, the 1st slot 24 is formed by the adjacent 1st tooth part 22, and the 2nd slot 25 is formed between the 2nd tooth parts 23 extended in two steps. Insulation between the stator core 16 and each of the windings is configured through an insulator 7 (insulator A7a, insulator B7b) made of a resin molded product.

  Next, the most characteristic part of the present application, the structure of the insulator 7, will be described with reference to FIGS.

  FIG. 5 is a perspective view of the insulator A7a as viewed from the stator core 16 side. The insulator A7a is integrally formed of synthetic resin, and rotates so as to cover the annular base 30 that contacts the lower surface of the stator core 16 and the wall surfaces of the first slot 24 and the second slot 25 from there. It has the cylindrical wall part A32 and wall part B33 extended in the axial direction. That is, the wall portion A32 is inserted into the first slot 24 on the inner peripheral side, and the wall portion B33 is inserted into the second slot 25 on the outer peripheral side. Furthermore, the wall part B33 is configured by a first wall part B33a, a second wall part B33b, and a third wall part B33c having different axial heights from the base part 30. That is, the height from the base portion 30 is lower in the second wall portion B33b than in the first wall portion B33a, and is lower in the third wall portion B33c than in the second wall portion B33b. The base 30 is provided with a portion protruding toward the inner peripheral side, and a positioning projection 31 is provided protruding toward the stator core 16 side.

  FIG. 6 is a perspective view of the insulator B7b as viewed from the stator core 16 side. The insulator B7b has substantially the same shape as the insulator A7a. That is, the insulator B7b is integrally formed of synthetic resin, and covers the annular base 40 that contacts the upper surface of the stator core 16 and the wall surfaces of the first slot 24 and the second slot 25 from there. Have a cylindrical wall portion A42 and a wall portion B43 extending in the direction of the rotation axis. That is, the wall portion A42 is inserted into the first slot 24 on the inner peripheral side, and the wall portion B43 is inserted into the second slot 25 on the outer peripheral side. Furthermore, the wall part B43 is configured by a first wall part B43a, a second wall part B43b, and a third wall part B43c having different axial heights from the base part 40. That is, the height from the base 40 is lower in the second wall B43b than in the first wall B43a, and is lower in the third wall B43c than in the second wall B43b. The base 40 is provided with a portion protruding toward the inner peripheral side, and a positioning protrusion 41 is provided protruding toward the stator core 16 side.

  FIG. 7 is a schematic cross-sectional view of the wall portion A32 and wall portion B33 of the insulator A7a, and a schematic cross-sectional view of the wall portion A42 and wall portion B43 of the insulator B7b. In this drawing, the stator core 16 is omitted for easy understanding. Further, the wall portion A32 and the wall portion B33, and the wall portion A42 and the wall portion B43 are different positions in the radial direction, but are drawn on the same plane for simplification. Furthermore, although wall part A32, wall part B33, wall part A42, and wall part B43 are located in a ring shape, they are opened and drawn in a planar shape.

  Here, the A-phase winding 8 and the B-phase winding 9 are not shown. The insulator A7a and the insulator B7b are attached to the stator core 16 from the rotation axis direction.

  As shown in FIG. 7, the first wall portion B33a and the third wall portion B43c face each other, and similarly, the second wall portion B33b and the second wall portion B43b, and the third wall portion B33c and the first wall portion B43a face each other. ing. When attached to the stator core 16 in such a state, as shown in FIG. 8, the first wall B33a having a high height of the insulator A7a is connected to the third wall B43c having a low height of the insulator B7b and the stator core. The same 16 second slots 25 are mounted. Similarly, the second wall B33b of the insulator A7a is mounted in the same second slot 25 as the second wall B43b of the insulator B7b. Further, the third wall portion B33c having a low height of the insulator A7a is mounted in the same second slot 25 as the first wall portion B43a having a high height of the insulator B7b.

  On the other hand, the wall portion A 32 and the wall portion A 42 on the inner peripheral side are mounted in the first slot 24 on the inner peripheral side of the stator core 16.

  Here, the top portions of the wall portions A32 and A42 and the wall portions B33 and B43 inserted into the same slot (the first slot 24 and the second slot 25) are formed to overlap each other by a predetermined length. Has been. In FIG. 8, the insulator A7a side is set to the inside.

  Further, the positioning protrusion 31 and the positioning protrusion 41 are inserted into the positioning hole 26 shown in FIG.

  Next, mounting of the insulator A7a will be described. First, the insulator A7a is applied to the stator core 16 so that the positioning protrusion 31 and the positioning hole 26 correspond to each other. The insulator A7a is inserted sequentially from the first wall B33a. When the leading end of the first wall B33a is inserted into the second slot 25, the second wall B33b is next inserted into the second slot 25. Then, the third wall portion B33c is inserted into the second slot 25, and finally, the positioning protrusion 31 is fitted into the positioning hole 26 to complete the mounting of the insulator A7a. The mounting operation is similarly performed on the insulator B7b.

  After the mounting, as described above, the top portions of the wall portion A32 and the wall portion A42, and the wall portion B33 and the wall portion B43 overlap each other by a predetermined length. The winding work is performed in this state.

  As described above, according to the electric motor 2 in the first embodiment of the present invention, the first wall portion B33a and the first wall portion B43a having a high height are first inserted into the second slot 25 first, so that the insertion is easy. As a result, assembly workability is improved.

  Moreover, since the high wall part (1st wall part B33a, 1st wall part B43a) is provided only in the outer peripheral side, the operation | work by visual confirmation becomes easy.

  Moreover, it is good to provide three high wall parts (1st wall part B33a, 1st wall part B43a) in one insulator (insulator A7a, insulator B7b). With such a configuration, when the stator core 16 is applied, positioning can be performed on a flat surface, and the insulator can be easily attached.

  The height of the second wall portion B33b and the second wall portion B43b from the base portion 30 and the base portion 40 is about ½ of the axial thickness of the stator core 16. And the height from the base 30 and the base 40 of a high wall part (1st wall part B33a, 1st wall part B43a) is made higher than 1/2 of the thickness of the axial direction of the stator core 16. FIG. Moreover, the height from the base part 30 and the base part 40 of the low wall part (3rd wall part B33c, 3rd wall part B43c) is made lower than 1/2 of the axial thickness of the stator core 16. . With such a configuration, the insulator A7a and the insulator B7b have the same configuration.

  In the present embodiment, the wall portion B33 and the wall portion B43 are each configured with three types of height, but may be configured with three or more types of height.

  The electric motor according to the present invention is capable of improving quality, facilitating and rationalizing assembly while ensuring sufficient insulation performance, and can be applied to a driving electric motor such as a ceiling fan, for example.

DESCRIPTION OF SYMBOLS 1 Ceiling fan 2 Electric motor 3 Blade | blade 4 Support | pillar 5 Main body cover 6 Hollow shaft 7 Insulator 7a Insulator A
7b Insulator B
DESCRIPTION OF SYMBOLS 11 Upper cover 12 Rotor cover 16 Stator core 17 Rotor core 22 1st tooth part 23 2nd tooth part 24 1st slot 25 2nd slot 26 Positioning hole 30, 40 Base part 31, 41 Positioning protrusion 32, 42 Wall part A
33, 43 Wall B
33a, 43a 1st wall part B
33b, 43b second wall part B
33c, 43c 3rd wall part B

Claims (5)

A stator core having a plurality of first slots for applying an A-phase winding and a plurality of second slots for applying a B-phase winding, and a rotor attached rotatably to the side surface of the stator core. An electric motor,
The stator core is
The first slot for providing the A-phase winding on the inner peripheral side is provided in an annular shape,
The second slot for applying the B-phase winding to the outer peripheral side of the first slot is provided in an annular shape,
A pair of upper and lower insulators (insulator A, insulator B) are mounted so as to be sandwiched from above and below in the axial direction,
This insulator
Each made of synthetic resin,
A base composed of a plane perpendicular to the rotation axis;
It is composed of a plurality of cylindrical wall portions extending in the rotation axis direction from the base portion so as to cover the wall surfaces of the first slot and the second slot,
Each wall portion provided corresponding to the second slot on the outer peripheral side ,
It is composed of three types of first wall, second wall, and third wall with different heights from the base,
The highest first wall portion of the insulator A and the lowest third wall portion of the insulator B are opposed to each other,
The second wall portion of the insulator A and the second wall portion of the insulator B are opposed to each other,
The lower third wall portion of the insulator A and the highest first wall portion of the insulator B are opposed to each other and attached to the stator core.
All wall portions provided corresponding to the first slot on the inner peripheral side are:
An electric motor configured to be lower in height from the base than the first wall . A small hole for positioning is provided on the inner peripheral side of the first slot of the stator core,
The electric motor according to claim 1, wherein the insulator is provided with a positioning protrusion that fits into the small hole. The electric motor according to claim 1, wherein at least three of the first wall portion and the third wall portion are provided. The height of the second wall from the base is about ½ of the axial thickness of the stator core,
The height of the first wall portion from the base portion is higher than ½ of the axial thickness of the stator core,
The electric motor according to any one of claims 1 to 3 , wherein a height of the third wall portion from the base portion is lower than a half of an axial thickness of the stator core. A ceiling fan equipped with the electric motor according to claim 1 .

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