JP2010172083A - Claw pole type motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a claw pole type motor which is high in heat dissipation performance, and a manufacturing method of the claw pole type motor. <P>SOLUTION: The claw pole type motor 200 comprises a first core 12 having a plurality of claws on its circumference, a second core 16 arranged so as to oppose the first core 12, and a ring-shaped coil 14 sandwiched by the first core 12 and the second core 16, and also comprises a first insulator 13 arranged between the first core 12 and the ring-shaped coil 14, and a second insulator 15 arranged between the second core 16 and the ring-shaped coil 14. The ring-shaped coil 14 is wound so that the longitudinal direction of a flat type conductor coincides with the axial direction thereof, and the thickness X1 of the ring-shaped coil 14 is set to be thicker by a prescribed thickness t3 thicker than a thickness obtained by subtracting the thickness t1 of the first insulator 13 and the thickness t2 of the second insulator 15 from the thickness X2 of an accommodation recess into which the ring-shaped coil 14 formed of the first core 12 and the second core 16 is accommodated. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technique for improving heat dissipation of a stator by devising a coil used for a claw pole type motor.

In recent years, motors for obtaining driving force of vehicles have been actively developed. This is because there is an increasing need to drive a vehicle by the driving force of a motor such as a hybrid vehicle or an electric vehicle.
However, in order to obtain the driving force of the car with a motor, the motor is required to have a high output. And in order to mount in-vehicle, miniaturization of a motor is essential. In particular, a hybrid vehicle is required to be miniaturized because a motor and an engine need to be arranged in an engine room.
Therefore, a small and high-power motor is eagerly desired. However, in order to reduce the size and increase the output of the motor, it is necessary to increase the current flowing through the coil.

However, there is a problem that increasing the amount of current flowing through the motor coil increases the amount of heat generated. For this reason, the stator is cooled by increasing the cross-sectional area of the coil to reduce the amount of heat generation or by devising a cooling method for the coil.
Patent Document 1 discloses a technique related to a motor.
A high thermal conductivity insulator is placed at the coil end of the stator and is in close contact with a bracket that covers the outside of the stator. With such a configuration, the heat generated from the stator can be released to the outside through the high thermal conductivity insulator and the bracket at the coil end.

Patent Document 2 discloses a technique related to a claw pole type motor stator.
A cooling water channel is provided inside a stator ring prepared for the stator, and a cooling fluid is allowed to flow in the cooling water channel. The coil sandwiched between the stator rings generates resistance when an electric current is passed, but allows a cooling fluid to flow through the stator ring, thereby enabling efficient cooling of the claw pole type motor.

JP 2000-116063 A JP 2005-20981 A

However, it is considered that the technique described in Patent Document 1 or Patent Document 2 has a problem described below.
In the motor of Patent Document 1, heat transfer and heat release from the bracket are performed using a high thermal conductivity insulator. However, in order to increase the thermal conductivity of the insulator, the cost tends to increase, for example, a filler must be mixed with the insulator. In addition, there is a limit to increasing the thermal conductivity while ensuring insulation, and there is a problem that it is difficult to ensure the necessary thermal conductivity.
As a result, heat is more likely to accumulate on the coil end side of the stator than the stator core portion that transfers heat between solids.

On the other hand, in the claw pole type motor of Patent Document 2, the stator is cooled by providing a cooling water channel inside the stator ring in the outer peripheral portion of the stator. However, it is difficult to improve the product accuracy of a coil formed by winding or a stator ring formed of a dust material, and there is a problem that heat transfer is hindered if a gap is generated due to tolerance. .
Further, since the stator ring uses a dust material, it is difficult to form a complicated water channel inside, and the cost increases.

  Accordingly, an object of the present invention is to provide a claw-pole motor with high heat dissipation and a claw-pole motor manufacturing method in order to solve such problems.

In order to achieve the above object, a claw pole type motor according to the present invention has the following characteristics.
(1) A first core having a plurality of claw portions on the circumference, a second core disposed to face the first core, and a ring-shaped coil sandwiched between the first core and the second core In a claw pole type motor having
A first insulator disposed between the first core and the ring coil; and a second insulator disposed between the second core and the ring coil. The rectangular conductor is wound so that the longitudinal direction thereof coincides with the axial direction, and the thickness of the ring-shaped coil is a depression of the storage recess in which the ring-shaped coil formed by the first core and the second core is stored. The thickness of the first insulator and the thickness of the second insulator are set to be thicker by a predetermined thickness than the depth of the first insulator and the second insulator.

(2) In the claw pole type motor described in (1),
The predetermined thickness includes a first bushing thickness obtained by subtracting a distance from which the first insulator can ensure insulation between the ring-shaped coil and the first core from a thickness of the first insulator, and the second insulator It is the thickness which added the 2nd bush thickness which subtracted the distance which can ensure the insulation of the said ring-shaped coil and the said 2nd core from the thickness of the said 2nd insulator, It is characterized by the above-mentioned.

(3) In the claw pole type motor according to (1) or (2),
A surface where the first insulator and the second insulator are in contact with each other is formed in a tapered shape.

(4) In the claw pole type motor according to any one of (1) to (3),
The material of the first insulator and the second insulator is a material having a large elastic modulus and excellent heat resistance.

With the claw pole type motor according to the present invention having such characteristics, the following operations and effects can be obtained.
The invention described in (1) above is sandwiched between a first core having a plurality of claw portions on the circumference, a second core disposed opposite to the first core, and the first core and the second core. In a claw pole type motor having a ring-shaped coil, a first insulator disposed between the first core and the ring-shaped coil, and a second insulator disposed between the second core and the ring-shaped coil; The ring-shaped coil is wound with a rectangular conductor wound so that the longitudinal direction thereof coincides with the axial direction, and the ring-shaped coil is housed in the ring-shaped coil formed by the first core and the second core. It is set to be thicker by a predetermined thickness than the value obtained by subtracting the thickness of the first insulator and the thickness of the second insulator from the depth of the recess of the storage recess.

By setting the thickness of the ring-shaped coil to be a predetermined thickness, the first and second insulators are brought into close contact with each other when being sandwiched between the first core and the second core. become. Therefore, it is possible to transfer heat to the first core and the second core via the ring-shaped coil, the first insulator, and the second insulator by contact between the solids, and it is possible to efficiently release heat. .
Since it is possible to efficiently release heat from both end faces of the ring coil, efficient cooling of the claw pole type motor can be realized.

Further, in the claw pole type motor described in (1) above, in the claw pole type motor described in (1), the predetermined thickness is a distance by which the first insulator can secure insulation between the ring-shaped coil and the first core. The first bushing allowance thickness subtracted from the thickness of the second insulator and the second insulator thickness obtained by subtracting the distance from which the second insulator can secure insulation between the ring-shaped coil and the second core from the thickness of the second insulator are added. Thickness is assumed.
The first insulator and the second insulator can ensure the cooling of the ring-shaped coil while ensuring the insulation between the ring-shaped coil and the first and second cores.

Further, in the claw pole type motor described in (1) or (2) described in (3) above, a surface where the first insulator and the second insulator are in contact with each other is formed in a tapered shape.
By forming the contact surface between the first insulator and the second insulator in a tapered shape, it is possible to ensure an insulation creepage distance between the ring-shaped coil and the first core and the second core. For this reason, even if the thickness of the 1st insulator and 2nd insulator arrange | positioned in order to ensure the insulation with a ring-shaped coil and a 1st core and a 2nd core is made thin, it is possible to prevent the short circuit in a connection part. It is.

Further, in the claw pole type motor according to any one of (1) to (3) described in (4) above, the material of the first insulator and the second insulator is a material having a large elastic modulus and excellent heat resistance. It is what you are trying.
By making the material of the first insulator and the second insulator a material having a large elastic modulus and excellent heat resistance, it becomes possible to improve the adhesion between the ring-shaped coil and the first insulator and the second insulator, thereby improving heat dissipation. It contributes to that.

It is a disassembled perspective view of the U-phase stack of this embodiment. It is a perspective view of the U phase stack of this embodiment. It is sectional drawing of the U-phase stack of this embodiment, and is AA cross section of FIG. It is a disassembled perspective view of the claw pole type motor of this embodiment. It is an expanded sectional view of the joined part of the 1st insulator of a U phase stack, and the 2nd insulator of this embodiment. It is an expanded sectional view showing the relation between the ring-shaped coil of the U phase stack and the 1st insulator of this embodiment.

First, an embodiment of the present invention will be described.
FIG. 1 shows an exploded perspective view of the U-phase stack. FIG. 2 shows a perspective view of the U-phase stack. FIG. 3 shows a cross-sectional view of the U-phase stack. FIG. 3 is an AA cross section of FIG.
The U-phase stack 10 includes a first core 12, a first insulator 13, a ring coil 14, a second insulator 15, and a second core 16.
The first core 12 is provided with 12 outer circumferential rings 12A and 12 claw portions 12B, which are claw-shaped projections, projecting toward the inner circumferential side of the outer circumferential ring 12A. The claw portion 12B is formed so as to protrude in the axial direction of the outer peripheral ring 12A. Specifically, the inner peripheral wall surface 12Bb provided so as to be orthogonal to the claw portion bottom surface 12Ba and the tapered surface 12Bc intersect with each other to form an intersection on the opposite side of the claw portion bottom surface 12Ba and to be provided on the outer ring 12A. The claw portions 12B are provided on the outer ring 12A alternately with the recesses 12C.
For the first core 12, a powder magnetic core made of a material obtained by finely pulverizing a magnetic material such as iron powder or permalloy and a resin is used. By using such a powder magnetic core, iron loss that occurs when the U-phase stack 10 is assembled to the stator 100 and used as a motor can be reduced.

A first cutout portion 12a and a second cutout portion 12b are provided on the surface of the outer peripheral ring 12A on the side where the claw portion 12B protrudes.
The second core 16 has substantially the same shape as the first core 12 and is disposed so as to face the first core 12.
The second core 16 is also provided with a claw portion 16B and a concave portion 16C on the inner peripheral side of the outer peripheral ring 16A, and is provided with a first cutout portion 16a and a second cutout portion 16b. The outer ring 16A corresponds to the outer ring 12A, the claw 16B corresponds to the claw 12B, the recess 16C corresponds to the recess 12C, and the first notch 16a and the second notch 16b correspond to the first notch 12a and the second notch 12b. To do.
The 1st insulator 13 is formed in cyclic | annular form with the resin which has insulation. The cross section is U-shaped, and as shown in FIG. 3, a groove portion 13 </ b> A serving as a groove in which the ring-shaped coil 14 is accommodated is formed.

The second insulator 15 is formed in substantially the same shape as the first insulator 13 and includes a groove portion 15A. In addition, the surface which the 1st insulator 13 and the 2nd insulator 15 oppose and contact is formed in the shape cut diagonally, and the 2nd insulator 15 and the 1st insulator 13 contact | abut the surface cut diagonally. Designed. By being configured in this way, it contributes to earning an insulation creepage distance between the first insulator 13 and the first core 12 or the second core 16.
The first insulator 13 and the second insulator 15 are made of a material having high insulating properties, high elastic force, and excellent heat resistance. Although the thickness t1 of the first insulator 13 and the thickness t2 of the second insulator 15 are set to about 0.3 mm, this thickness is determined when the first insulator 13 and the second insulator 15 are assembled to the stator 100. The thickness is set such that insulation between the first core 12 and the second core 16 and the ring coil 14 can be secured.

  The ring coil 14 is formed by winding a flat conductor having an insulating coating such as enamel on its surface. As shown in FIG. 1, the ring-shaped coil 14 is wound so that the longitudinal direction of the flat conductor coincides with the axial direction. Therefore, one end of the flat conductor is in a state of facing both end faces of the ring coil 14. The first coil end portion 14 </ b> A and the second coil end portion 14 </ b> B, which are the ends of the flat conductor, have a shape protruding toward the outer peripheral side of the ring-shaped coil 14. The conductor used for the ring coil 14 is preferably a highly conductive material such as copper or aluminum.

A U-phase stack 10 as shown in FIG. 2 is formed by combining the first core 12, the first insulator 13, the ring coil 14, the second insulator 15, and the second core 16 in the order shown in FIG.
Since the V-phase stack 20 and the W-phase stack 30 have the same configuration as that of the U-phase stack 10, the description thereof is omitted here.

FIG. 4 is an exploded perspective view of the claw pole type motor.
In this way, the U-phase stack 10, the V-phase stack 20, and the W-phase stack 30 are stacked as shown in FIG. 4 and sandwiched between the first bracket 61 and the second bracket 62, and the first fixing bolt 63A to the third fixing bolt 63C. The stator 100 is formed by fixing.
The 1st bracket 61 and the 2nd bracket 62 are annular plates, and are provided with the hole which penetrates the 1st fixing bolt 63A, the 2nd fixing bolt 63B, and the 3rd fixing bolt 63C in the outer peripheral part, and the hole to fasten. The first fixing bolt 63A is fastened to the first fastening hole 62A formed in the second bracket 62, the second fixing bolt 63B is fastened to the second fastening hole 62B, and the third fixing bolt 63C is fastened to the third fastening hole 62C. . Thus, the stator 100 is configured.
A rotor 50 and an output shaft 40 connected thereto are provided on the inner peripheral side of the stator 100 and function as a claw pole type motor 200.

Since the claw pole type motor 200 of the present embodiment is configured as described above, the following operations and effects are achieved.
First, the heat dissipation of the claw pole type motor 200 of this embodiment can be improved.
The claw pole type motor 200 of the present embodiment includes a first core 12 having a plurality of claw portions on the circumference, a second core 16 disposed to face the first core 12, the first core 12, and the first core 12. In the claw pole type motor 200 having the ring-shaped coil 14 sandwiched between the two cores 16, the first insulator 13 disposed between the first core 12 and the ring-shaped coil 14, the second core 16 and the ring-shaped coil A ring-shaped coil 14 is wound around a rectangular conductor so that the longitudinal direction thereof coincides with the axial direction, and the thickness X1 of the ring-shaped coil 14 is The thickness t1 of the first insulator 13 and the thickness t2 of the second insulator 15 are subtracted from the thickness X2 of the storage recess in which the ring-shaped coil 14 formed by the first core 12 and the second core 16 is stored. Than the thickness, is thicker set a predetermined thickness of t3.

FIG. 6 is an enlarged cross-sectional view showing the relationship between the ring-shaped coil of the U-phase stack and the first insulator.
For this reason, when the 1st core 12, the 1st insulator 13, the ring-shaped coil 14, the 2nd insulator 15, and the 2nd core 16 are assembled | attached, the 1st insulator 13 and the 2nd insulator 15 which use the resin material will be crushed. It becomes a state. This is because the coil thickness X1 of the ring-shaped coil 14 shown in FIG. 3 is from the core recess depth X2 to the first insulator 13 with respect to the core recess depth X2 formed by the first core 12 and the second core 16. This is because the thickness t1 and the thickness t2 of the second insulator 15 are set to be thicker.
The predetermined thickness t3 is the sum of the first thickness of the first bush 13 set for the first insulator 13 and the second thickness of the second bush 15 set for the second insulator 15. Is set to tsubashi allowance by t3 / 2.

Therefore, the first core 12, the first insulator 13, and the ring-shaped coil 14 are brought into close contact with each other by being crushed, and the ring-shaped coil 14, the second insulator 15, and the second core 16 are also brought into close contact with each other.
Therefore, heat generated from the ring-shaped coil 14 generated by energizing the claw pole type motor 200 is radiated to the outside through the first core 12 and the second core 16.
The ring-shaped coil 14 is wound so that the longitudinal direction coincides with the axial direction. That is, since the end portion of the flat conductor is in contact with the first insulator 13 and the second insulator 15, heat can be efficiently released.

Since high output of the claw pole type motor 200 is demanded, securing heat dissipation will be an important problem in the future. By quickly transferring heat to the first core 12 and the second core 16, heat is taken away by the first core 12 and the second core 16 having a larger heat capacity than the ring coil 14, and the ring coil 14 is cooled. The
Moreover, the insulation of the claw pole type motor 200 of this embodiment can be ensured.
FIG. 5 shows an enlarged cross-sectional view of the U-phase stack.
The connecting portion between the first insulator 13 and the second insulator 15 has a tapered surface. When the first core 12 and the second core 16 are combined, the first bracket 61 and the second bracket 62 are replaced with the first fixing bolt 63A, the second fixing bolt 63B, and the third fixing bolt 63C as shown in FIG. Use and fasten.

That is, by applying a force to the first core 12 and the second core 16, a force is applied to the ring-shaped coil 14 side, and the first insulator 13 and the second insulator 15 overlap to obtain an insulating creepage distance H. Since the insulation creepage distance is set by the taper surface distance T between the first core 12 and the second core 16, the insulation creepage distance H is increased by increasing the overlap between the first insulator 13 and the second insulator 15. The length of becomes longer. Therefore, the insulation between the first core 12 and the second core 16 and the ring-shaped coil 14 can be ensured.
Although the thickness t1 of the 1st insulator 13 and the 2nd insulator 15 is set to about 0.3 mm so that insulation is possible, there exists a possibility that it may short-circuit from the clearance gap in the junction part of the 1st insulator 13 and the 2nd insulator 15. is there. However, since the tapered surface distance T is set to a distance that can ensure the insulation creepage distance, the insulation creepage distance H can be obtained by overlapping the end surfaces of the first insulator 13 and the second insulator 15. For this reason, it is possible to prevent a short circuit.

Further, the predetermined thickness t3 includes a second margin thickness A2 obtained by subtracting a distance A1 from which the first insulator 13 can ensure insulation between the ring-shaped coil 14 and the first core 12 from the thickness t1 of the first insulator 13, and a second thickness t3. The insulator 15 has a thickness B2 that is obtained by subtracting a distance B1 that can ensure insulation between the ring-shaped coil 14 and the second core 16 from a thickness t2 of the second insulator 15.
The first insulator 13 and the second insulator 15 can ensure the cooling of the ring-shaped coil 14 while ensuring the insulation between the ring-shaped coil 14 and the first core 12 and the second core 16.
The thickness t1 of the first insulator 13 and the thickness t2 of the second insulator 15 are initially 0.3 mm, and as shown in FIG. 5, the first insulator 13 and the second insulator 15 are brought into contact with the ring coil 14 and crushed. As a result, the thickness is reduced to about 0.2 mm.

However, the first insulator 13 and the second insulator 15 are made of a material that can ensure insulation between the first core 12 and the second core 16 and the ring coil 14 even when the thickness is 0.2 mm.
In the claw pole type motor 200, the first insulator 13 and the second insulator 15 are made of a material having a high elastic modulus, thereby improving the adhesion between the ring-shaped coil 14 and the first insulator 13 and the second insulator 15. Is possible. In addition, the use of a material having excellent heat resistance can ensure proper insulation even under the temperature generated when the claw pole motor 200 is used.

Although the invention has been described according to the present embodiment, the invention is not limited to the embodiment, and by appropriately changing a part of the configuration without departing from the spirit of the invention. It can also be implemented.
For example, the exemplified materials can be changed, and the structure can be changed within the scope of the design change. Moreover, although the ring-shaped coil 14 is wound in two strips in this embodiment, it does not prevent the single coil winding.

10 U-phase stack 12 1st core 12A Outer peripheral ring 12B Claw part 12C Recess 13 First insulator 13A Groove part 13B Outer wall surface 14 Ring-shaped coil 14A First coil end part 14B Second coil end part 15 Insulator 15A Groove part 15B Outer wall surface 16 Second core 16A Outer ring 16B Claw portion 16C Recess 20 V-phase stack 30 W-phase stack 40 Output shaft 50 Rotor 61 First bracket 62 Second bracket 70 Grasping means 100 Stator 200 Claw pole type motor

Claims (4)

A claw having a first core having a plurality of claw portions on the circumference, a second core disposed opposite to the first core, and a ring coil sandwiched between the first core and the second core In the pole type motor,
A first insulator disposed between the first core and the ring coil;
A second insulator disposed between the second core and the ring-shaped coil,
The ring-shaped coil is wound with a rectangular conductor such that the longitudinal direction thereof coincides with the axial direction,
The ring coil has a thickness of
Predetermined from a value obtained by subtracting the thickness of the first insulator and the thickness of the second insulator from the depth of the recess of the storage recess in which the ring-shaped coil formed by the first core and the second core is stored. A claw pole type motor characterized by being set thicker than the thickness of. The claw pole type motor according to claim 1,
The predetermined thickness is
A first bushing thickness obtained by subtracting a distance from which the first insulator can ensure insulation between the ring-shaped coil and the first core from a thickness of the first insulator;
The second insulator has a thickness obtained by adding a second bushing thickness obtained by subtracting a distance capable of ensuring insulation between the ring-shaped coil and the second core from a thickness of the second insulator. Claw pole type motor. In the claw pole type motor according to claim 1 or 2,
A claw pole type motor characterized in that a surface where the first insulator and the second insulator are in contact with each other is formed in a tapered shape. The claw pole type motor according to any one of claims 1 to 3,
A claw pole type motor characterized in that the first insulator and the second insulator are made of a material having a large elastic modulus and excellent heat resistance.

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