JP2011130531A - Axial gap motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an axial gap motor which does not need to form a space for introducing a cooling medium into a stator, and can cool the stator while reducing a motor loss. <P>SOLUTION: A rotor 11 of the axial gap motor 10 is magnetized in the axial direction of rotation, and is constituted of a plurality of main magnets 41 which are arranged at prescribed intervals in circumferential directions and a laminated body 71 wound with a tape-shaped electromagnetic steel plate 60, wherein a plurality of yokes 42 are arranged in one of the axial directions of rotation of the plurality of main magnets 41, and a shaft 55 is attached to the internal peripheral side of the laminated body 71. Cooling passages 20 which extend in radial directions are formed at the laminated body 71 and the shaft 55, and the cooling medium is fed to the stator 12 via the cooling passages 20. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an axial gap type motor.

  Conventionally, for example, a rotor that can rotate around a rotation axis and a stator that is disposed to face the rotor from at least one side in the direction of the rotation axis are provided. An axial gap type motor that forms a loop is known.

  The stator of this axial gap type motor has a substantially annular plate-like stator yoke portion and a rotor yoke along a rotational axis direction from a position spaced apart in a circumferential direction on a facing surface of the stator yoke portion facing the rotor. A plurality of teeth projecting in the opposite direction and extending in the radial direction, and windings attached to the teeth.

  In recent years, one of the measures for further miniaturization and higher output of motors is to reduce the loss due to heat generated from the stator yoke and windings during motor operation. It is known that it is effective to cool the stator yoke portion and the winding. Patent Documents 1 and 2 disclose a method of cooling an axial gap type motor by introducing a refrigerant into a housing that houses a stator yoke portion and windings and directly cooling with the refrigerant.

JP 2005-143268 A Japanese Patent Application Laid-Open No. 2005-261083

However, the axial gap motor cooling methods described in Patent Documents 1 and 2 have a problem that the axial gap motor itself is increased in size because a space for introducing a refrigerant into the stator and the housing is required.
A method of supplying refrigerant from the shaft portion of the rotor is also known. However, if the refrigerant is supplied directly from the shaft portion to the stator side, an air gap is formed between the yoke portion of the rotor and the teeth of the stator. There is a problem that the refrigerant stays in the air gap formation region, and the refrigerant becomes friction and causes motor loss.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an axial gap type motor that can cool a stator while reducing motor loss without requiring a space for introducing a refrigerant into the stator. There is.

In order to achieve the above object, the invention described in claim 1
A rotor capable of rotating around a rotation axis (for example, a rotor 11 in an embodiment described later);
A substantially yoke-shaped stator yoke part (for example, a stator yoke part 21 in an embodiment described later) and an opposing surface of the stator yoke part facing the rotor, which are arranged to face the rotor from at least one of the rotation axis directions. A plurality of teeth (for example, teeth 22 in an embodiment described later) projecting toward the rotor along the rotation axis direction from a position spaced apart in the circumferential direction above and extending in the radial direction are attached to the teeth. An axial gap motor (e.g., an axial gap type in an embodiment described later), and a stator (e.g., stator 12 in an embodiment described later). A motor 10),
The rotor is
A plurality of main magnet parts magnetized in the rotation axis direction and arranged at a predetermined interval in the circumferential direction (for example, a main magnet part 41 in an embodiment described later);
The rotary shafts of the plurality of main magnet portions are configured by a laminated body (for example, a laminated body 71 in an embodiment described later) wound by winding a tape-shaped electromagnetic steel sheet (e.g., an electromagnetic steel sheet 60 in an embodiment described later). A plurality of yoke portions (for example, yoke portions 42 in the embodiments described later) respectively disposed in at least one of the directions;
A shaft portion (for example, a shaft portion 55 in an embodiment described later) attached to the inner peripheral side of the laminate,
The laminated body and the shaft portion are provided with a cooling passage extending in a radial direction (for example, a cooling passage 20 in an embodiment described later),
The coolant supplied from the shaft portion is supplied to the stator through the cooling passage.

In addition to the configuration of the invention described in claim 1, the invention described in claim 2
The refrigerant supplied through the cooling passage is from an air gap forming region (for example, an air gap forming region 25 in an embodiment described later) that forms an air gap between the yoke portion of the rotor and the teeth of the stator. The stator is supplied from the outer diameter side to the stator.

In addition to the configuration of the invention described in claim 1 or 2, the invention described in claim 3
The rotor further includes an outer diameter side pressing member (for example, a die-cast string 33 and an outer ring 50 in an embodiment described later) attached to the outer diameter side of the laminate,
The outer diameter side pressing member is provided with a guide passage (for example, a guide passage 97 in an embodiment described later) that communicates with the cooling passage and extends toward the stator.

In addition to the configuration of the invention described in claim 3, the invention described in claim 4
An outer periphery transition portion of the winding (for example, an outer periphery transition portion 23a in an embodiment described later) is inclined toward the rotor over the entire periphery so that the refrigerant supplied from the guide passage is easily applied. Features.

In addition to the configuration of the invention described in claim 3, the invention described in claim 5 includes
A housing (for example, a housing 13 in an embodiment described later) that holds the stator and covers an outer peripheral portion of the rotor;
In the housing, annular guide members (for example, annular guide members 100A and 100B in the embodiments described later) for guiding the refrigerant scattered from the guide passage toward the outer diameter side to the stator side cover the entire circumference of the rotor. It is provided.

In addition to the structure of the invention described in claim 3, the invention described in claim 6
A housing (for example, a housing 13 in an embodiment described later) that holds the stator and covers an outer peripheral portion of the rotor;
The housing is provided with an upper guide member (for example, an upper guide member 110 in an embodiment described later) that receives the refrigerant scattered on the outer diameter side from the guide passage and drops it onto the stator by the gravity of the refrigerant. It is characterized by being.

In addition to the structure of the invention described in claim 1 or 2, the invention described in claim 7
A housing (for example, a housing 13 in an embodiment described later) that holds the stator and covers an outer peripheral portion of the rotor;
The rotor further includes an outer diameter side pressing member (for example, a die-cast string 33 and an outer ring 50 in an embodiment described later) attached to the outer diameter side of the laminate,
The outer diameter side pressing member is provided with a through hole (for example, an outer ring through hole 99 in an embodiment described later) that communicates with the cooling passage and penetrates to the outer diameter side.
The housing is provided with an upper guide member (for example, an upper guide member 120 in an embodiment described later) that receives the refrigerant scattered on the outer diameter side from the through hole and drops it onto the stator by the gravity of the refrigerant. It is characterized by being.

In addition to the configuration of the invention according to any one of claims 1 to 7, the invention according to claim 8
The laminate is provided with a magnetic flux short-circuit suppression unit (for example, a magnetic flux short-circuit suppression unit 73 in an embodiment described later) between the main magnet units adjacent in the circumferential direction.
The magnet short-circuit suppressing portion accommodates a spoke pin (for example, a spoke pin 35 in an embodiment described later) inserted from the inner diameter side of the laminate.
The spoke pin is provided with a spoke pin through passage (for example, a spoke pin through passage 93 in an embodiment described later) that extends in the radial direction and constitutes a part of the cooling passage.

In addition to the structure of the invention described in any one of claims 1 to 7, the invention described in claim 9 includes
The laminated body is provided with a main magnet part insertion hole (for example, a main magnet part insertion hole 72 in an embodiment described later) for accommodating the main magnet part,
A space formed between the main magnet part insertion hole and the main magnet part accommodated in the main magnet part insertion hole constitutes a part of the cooling passage.

In addition to the structure of the invention described in any one of claims 1 to 9, the invention described in claim 10 includes
The shaft portion further includes a radial refrigerant path (for example, a radial refrigerant path in an embodiment described later) penetrating toward an inner peripheral transition portion (for example, an inner peripheral transition portion 23b in an embodiment described later) of the winding. 92b) and an annular projecting portion (for example, a projecting portion 921 in an embodiment described later) that guides the refrigerant scattered from the opening to the inner peripheral crossing portion of the winding adjacent to the opening of the radial refrigerant path. And
The projecting portion is located on the inner side in the axial direction with respect to the opening, and forms an air gap between the yoke portion of the rotor and the teeth of the stator (for example, an air gap in an embodiment described later). It is characterized by being located outside the formation region 25).

In addition to the structure of the invention described in any one of claims 1 to 10, the invention described in claim 11 includes
A housing (for example, a housing 13 in an embodiment described later) that holds the stator and covers an outer peripheral portion of the rotor;
The refrigerant accumulated in the lower portion of the housing is circulated through the cooling passage through an oil pump and a feed pipe after passing through a strainer.

  According to the first aspect of the invention, since the refrigerant is supplied to the stator from the cooling passage extending in the radial direction through the shaft portion and the laminated body, it is not necessary to provide a space for introducing the refrigerant into the stator and the housing that houses the stator. In addition, since the refrigerant is supplied to the stator by the centrifugal force of the rotor, the supply amount is automatically adjusted according to the rotation speed, so that more refrigerant is supplied at the time of high-speed rotation of the rotor where the stator becomes hot. Can do. Further, since the cooling passage is also formed in the laminated body, the refrigerant can be supplied to the stator while avoiding the air gap formation region. As a result, it is possible to prevent the refrigerant from staying in the air gap formation region, causing the refrigerant to become friction and causing motor loss.

  According to invention of Claim 2, it can suppress that a refrigerant | coolant becomes friction and it becomes a motor loss.

  According to the invention of claim 3, the stator can be cooled while avoiding the air gap formation region.

  According to invention of Claim 4, a refrigerant | coolant can be supplied to the outer periphery transition part of the coil | winding wound by the teeth of a stator more efficiently.

  According to the fifth to seventh aspects of the present invention, the refrigerant can be reliably supplied to the stator by the annular guide member or the upper guide member even when a large centrifugal force is applied.

  According to invention of Claim 8 and 9, a cooling channel | path can be made into a simple structure.

  According to the tenth aspect of the present invention, the refrigerant can be supplied also to the inner peripheral part of the winding wound around the teeth of the stator while avoiding the refrigerant from staying in the air gap formation region and causing friction. it can.

  According to the invention of claim 11, the refrigerant can be circulated.

1 is an overall perspective view of an axial gap type motor according to a first embodiment of the present invention. It is a disassembled perspective view of the axial gap type motor of FIG. It is a disassembled perspective view of a rotor. It is a fragmentary perspective view of the laminated body which accommodated the main magnet part and the submagnet part. (A) is the figure which expand | deployed the main layer which consists of an innermost layer and an intermediate | middle layer in the circumferential direction, (b) is the figure which expand | deployed the outermost layer in the circumferential direction. It is explanatory drawing explaining the process of winding an electromagnetic steel plate and forming a laminated body. It is explanatory drawing explaining the process of forming a die-cast string. It is sectional drawing of the axial gap type motor of FIG. 1 accommodated in the housing. It is sectional drawing of the axial gap type motor of 2nd Embodiment accommodated in the housing. It is sectional drawing of the axial gap type motor of 3rd Embodiment accommodated in the housing. It is an enlarged view of A of FIG. It is sectional drawing of the axial gap type motor of 4th Embodiment accommodated in the housing. It is sectional drawing of the axial gap type motor of 5th Embodiment accommodated in the housing. (A) And (b) is a figure which shows the cooling channel | path which concerns on a modification. It is sectional drawing of the axial gap type motor accommodated in the housing which has a structure which cools the inner periphery crossing part of a coil | winding.

Hereinafter, embodiments of an axial gap type motor according to the present invention will be described in detail with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
<First Embodiment>
The axial gap type motor 10 according to the first embodiment of the present invention includes, for example, a substantially annular rotor 11 that is rotatably provided around a rotation axis O of the axial gap type motor 10 as shown in FIGS. And a pair of stators 12 having a plurality of phase windings 23 (see FIG. 8) that are arranged to face each other with both sides of the rotor 11 interposed therebetween and generate a rotating magnetic field that rotates the rotor 11. Configured.

  The axial gap type motor 10 is mounted as a drive source in a vehicle such as a hybrid vehicle or an electric vehicle, for example, and an output shaft is connected to an input shaft of a transmission (not shown), whereby the driving force of the axial gap type motor 10 is obtained. Is transmitted to drive wheels (not shown) of the vehicle via a transmission.

  Further, when the driving force is transmitted from the driving wheel side to the axial gap type motor 10 during deceleration of the vehicle, the axial gap type motor 10 functions as a generator to generate a so-called regenerative braking force, and the kinetic energy of the vehicle body is electrically converted. Recover as energy (regenerative energy). Further, for example, in a hybrid vehicle, when the rotary shaft O of the axial gap motor 10 is connected to a crankshaft of an internal combustion engine (not shown), the output of the internal combustion engine is transmitted to the axial gap motor 10 as well. The axial gap type motor 10 functions as a generator and generates power generation energy.

  Referring also to FIG. 2, each stator 12 has a substantially annular plate-shaped stator yoke portion 21 and a rotating shaft from a position spaced apart from the stator yoke 21 facing the rotor 11 at a predetermined interval in the circumferential direction. A plurality of teeth 22,..., 22 projecting toward the rotor 11 along the O direction and extending in the radial direction, and windings 23 (see FIG. 8) attached between the appropriate teeth 22, 22. Has been. The stator 12 is held by a housing 13 (see FIG. 8) that covers the outer periphery of the rotor 11 on the side opposite to the surface facing the rotor 11.

  Each stator 12 is, for example, a 6N type having six main poles (for example, U +, V +, W +, U−, V−, W−), and each U +, V +, W + pole of one stator 12. On the other hand, the U-, V-, and W-poles of the other stator 12 are set to face each other in the direction of the rotation axis O. For example, with respect to a pair of stators 12 and 12 opposed in the direction of the rotation axis O, three teeth 22 of one stator 12 corresponding to one of U +, V +, W + poles and one of U−, V−, W− poles, 22, 22 and the three teeth 22, 22, 22 of the other stator 12 corresponding to the other of the U +, V +, W + pole and the U−, V−, W− pole face each other in the direction of the rotation axis O. Thus, the energized state of the teeth 22 of one stator 12 and the teeth 22 of the other stator 12 facing each other in the direction of the rotation axis O is set so as to be reversed by an electrical angle.

  3 and 8, the rotor 11 includes a shaft portion 55, a pair of inner plates 31A and 31B, a cored bar 32, a plurality of spoke pins 35, and a plurality of main magnet portions 41,. , 43, a plurality of yoke parts 42,..., A die cast ring 33 (outer diameter side pressing member), and an outer ring 50 (outer diameter side pressing member). It is prepared for.

  As shown in FIGS. 4 to 6, the plurality of yoke portions 42,..., 42 are configured by a laminated body 71 in which a tape-shaped electromagnetic steel sheet 60 is wound around a core metal 32. The tape-shaped electromagnetic steel sheet 60 is punched using, for example, a press molding machine, so that the innermost layer and the intermediate layer (hereinafter referred to as the main layer 71b) excluding the outermost layer 71a are shown in FIG. As shown to a), the notch 61 for main magnet parts, the notch 62 for submagnet parts, and the notch 63 for magnetic flux short circuit suppression parts are formed. As shown in FIG. 6, the tape-shaped electromagnetic steel plate 60 is wound by winding the winding start portion 64 on the core metal 32 and rotating the core metal 32 while applying tension to the electromagnetic steel plate 60. The laminated body 71 is configured by cutting and welding at the end portion 65.

  The core metal 32 is an annular member made of a nonmagnetic material such as a stainless steel plate (for example, SUS304), and a plurality of spoke through holes 32a (12 in this embodiment) are formed at predetermined intervals in the circumferential direction. The Spoke pins 35 are inserted into the spoke through holes 32a from the inner diameter side.

  Each spoke pin 35 is formed in a magnetic steel plate 60 extending from the spoke base 35b to the outer diameter side with a spoke base 35b having a bolt through hole 35a communicating with a bolt fastening hole 36 formed in inner plates 31A and 31B described later. And a spoke portion 35c having substantially the same cross-sectional shape as the magnetic flux short-circuit suppressing portion notch 63 to be formed. The spoke pin 35 is used as a positioning member when the tape-shaped electromagnetic steel sheet 60 is wound on the core metal 32, and the electromagnetic steel sheet 60 is wound around the core metal 32 while applying tension. In this case, it is inserted into the spoke through hole 32a from the inner diameter side of the cored bar 32 and protrudes from the magnetic flux short-circuit suppressing part notch 63 to be cut out from the main magnet part notch 61 and the sub magnet part notch 62 of each layer, The magnetic flux short-circuit suppressing portion notch 63 is prevented from being displaced and stacked.

  Since the tape-shaped electromagnetic steel sheet 60 is wound on the annular cored bar 32, the length in the longitudinal direction increases from the innermost layer to the first layer, the second layer, the third layer,. For this reason, in FIG. 5A, when the distance P between the centers of the magnetic flux short-circuit suppressing portion notches 63 is defined as a pitch P, the pitch P of each layer is set so as to gradually increase outward in the radial direction.

  In the laminated body 71 wound in this manner, as shown in FIG. 4, a plurality of substantially magnet-shaped main magnet part insertion holes 72 formed by the main magnet part notches 61 are formed at the intermediate part in the rotation axis direction. , 72, and a plurality of substantially rectangular parallelepiped magnetic flux short-circuit suppression portions 73, ..., 73 formed by the magnetic flux short-circuit suppression portion notches 63 are alternately provided at predetermined intervals in the circumferential direction. On both sides in the rotation axis direction, a plurality of substantially magnet-shaped yoke portions 42,..., 42 and a plurality of sub-magnet-shaped housing portions 74 each having a substantially rectangular parallelepiped shape opened outward in the axial direction formed by the notch 62 for the sub-magnet portion. ,..., 74 are alternately provided at predetermined intervals in the circumferential direction (see FIG. 3).

  Further, the plurality of yoke portions 42,..., 42 are respectively disposed on both sides in the rotation axis direction of the plurality of main magnet portion insertion holes 72,. Are arranged on both sides of the rotation axis direction of the magnetic flux short-circuit suppressing portions 73,. The main magnet part insertion hole 72 and the magnetic flux short-circuit suppressing part 73 are partitioned by an axial direction connecting part 75 that connects the yoke parts 42 on both sides in the axial direction. 73 is partitioned by a circumferential connecting portion 76 that connects the yoke portions 42 on both sides in the circumferential direction.

In each of the main magnet part insertion holes 72, ..., 72 of the laminate 71 thus configured, a plurality of substantially sector-shaped main magnet parts 41, ... having substantially the same dimensions as the insertion holes 72, ..., 72 are provided. 41 is inserted into each of the secondary magnet portion accommodating portions 74,..., 74, and a plurality of substantially rectangular parallelepiped secondary magnet portions 43,. Is done.
In the present embodiment, the main layer 71b of the electromagnetic steel sheet 60 is wound and the main magnet portions 41,..., 41 and the sub magnet portions 43,. ,..., 72, the submagnet housing parts 74,..., 74 and the magnetic flux short-circuit suppressing parts 73,.

  Further, as shown in FIG. 4, the secondary magnet portion accommodating portion 74 is provided at the distal end portion of the circumferential surface connecting portion 76 between the adjacent yoke portions 42 and the inclined surface 77 formed at the circumferential end portion of the yoke portion 42. The sub-magnet portion 43 is positioned in the axial direction by the projection 78 formed, and is positioned in the circumferential direction between the circumferential side surfaces of the adjacent yoke portions 42.

  Thereby, the plurality of main magnet portions 41,..., 41 are arranged at predetermined intervals in the circumferential direction, and the rotation direction is different so that the magnetization direction is different for each of the adjacent main magnet portions 41, 41 in the circumferential direction. It is directed in the O direction. Further, the plurality of sub-magnet portions 43,..., 43 are disposed between the yoke portions 42 adjacent in the circumferential direction, and the magnetization directions thereof are directed in the direction orthogonal to the rotation axis direction and the radial direction. The secondary magnet portions 43 and 43 adjacent in the circumferential direction have different magnetization directions, and the secondary magnet portions 43 and 43 adjacent in the rotation axis direction also have different magnetization directions.

Further, the sub magnet portions 43 and 43 that sandwich the yoke portion 42 located on one side of the rotation axis O direction from both sides in the circumferential direction with respect to each main magnet portion 41 are magnetic poles on one side of the main magnet portion 41. The sub-magnet portions 43, 43, which are disposed so that the same-polarity magnetic poles face each other and sandwich the yoke portion 42 located on the other side in the rotation axis direction from both circumferential sides, are the same as the other-side magnetic poles of the main magnet portion 41. The magnetic poles of the poles are arranged to face each other. Thereby, due to the magnetic flux lens effect by the so-called Halbach arrangement of so-called permanent magnets, the magnetic fluxes of the main magnet portion 41 and the sub-magnet portions 43 and 43 converge, and the effective magnetic flux linked to the stators 12 and 12 is relatively It is going to increase.
In addition, since each yoke portion 42,..., 42 is formed with an inclined surface 77 at its circumferential end, the polar arc angle is adjusted, and a sudden change in magnetic resistance between the stators 12 and 12 occurs. And the occurrence of torque ripple can be suppressed.

  The inner plates 31A and 31B are made of a magnetic material such as carbon steel (for example, S45C) and are disposed on the inner diameter side of the core metal 32 to press the laminated body 71 to the outer diameter side via the core metal 32. More specifically, each of the inner plates 31A and 31B is press-fitted into the inner peripheral portion of the core metal 32 so as to sandwich the plurality of spoke pins 35 from one side and the other side in the rotation axis O direction. Press contact in the radial direction. Thereby, the diameter of the cored bar 32 is slightly increased, and a compressive force to the outer diameter side is applied to the laminated body 71.

  As shown in FIG. 7, the die-cast string 33 is in a state in which the main magnet portions 41,..., 41 and the sub magnet portions 43,. The laminated body 71 is disposed in the first and second molds 80 and 81, and a nonmagnetic die casting alloy such as an aluminum alloy (for example, ADC12) is melted and cast while applying a die casting pressure.

  The first and second molds 80 and 81 are divided into two in the rotation axis direction, and the respective side surfaces respectively corresponding to the axial side surfaces of the inner plates 31A and 31B, the cored bar 32, the yoke portion 42, and the sub magnet portion 43. The first and second molds 80 and 81 have inner peripheral surfaces 80b, 81b, 80c, and 81c corresponding to the side surfaces and the outer peripheral surface of the die caster string 33, respectively.

  Then, the main magnet portions 41, ..., 41, the sub magnet portions 43, ..., 43, the laminated body 71, the cored bar 32, the spoke pins 35, ..., 35 and the inner plates 31A, 31B are accommodated in the first state. The second molds 80 and 81 are closed, and a die casting alloy is poured into the space formed between the molds 80 and 81 from the gate 84 provided in the second mold 81. The gate 84 is provided so as to open at a radial position corresponding to the die-cast string 33. For this reason, the die-cast alloy poured from the gate 84 flows into the space constituting the die-cast string 33, and the die-cast string 33 is formed by casting.

  In addition, at the time of casting, the outermost layer 71a of the laminated body 71 is pressed against the inner diameter side by the pressure, so that a compressive force to the inner diameter side acts on the laminated body 71. As a result, the die-cast string 33 is formed in pressure contact with the laminated body 71 from the outer diameter side.

  Since the die-cast alloy is prevented from coming into direct contact with the magnet parts 41, ..., 41, 43, ..., 43 by the outermost layer 71a, the magnet parts 41, ..., 41, 43, ..., 43 are prevented. It is possible to suppress the deterioration of the coercive force.

  An annular outer ring 50 made of a high-strength material such as a stainless steel plate (for example, SUS304) or carbon steel (for example, S45C) is attached to the outer peripheral portion of the die cast string 33. Since the outer ring 50 is attached to the outer peripheral portion of the die cast ring 33 by shrink fitting, the outer ring 50 also exerts a compressive force on the inner diameter side of the laminated body 71 via the die cast string 33.

Therefore, the rotor 11 constituting the axial gap type motor 10 of the present embodiment is configured such that the core metal 32 is attached to the laminated body 71 in which the main magnet portions 41,..., 41 and the sub magnet portions 43,. The inner plates 31A and 31B are press-fitted from the inner diameter side, and the die cast ring 33 and the outer ring 50 are attached from the outer diameter side so as to exert a compressive force on the inner diameter side. ) Has occurred.
Here, the required surface pressures P between the inner plates 31A and 31B and the core metal 32, between the core metal 32 and the laminated body 71, between the laminated body 71 and the die-cast string 33, and between the die-cast string 33 and the outer ring 50 are maximum. When the load torque T, the fastening portion radius are r, the fastening area A, and the friction coefficient μ, the following equation (1) is satisfied.
P ≧ T / (r × A × μ) (1)
The required surface pressure can be adjusted by the press-fitting allowance of the inner plates 31A and 31B to the core metal 32, the die-casting pressure at the time of forming the die cast string 33, and the shrinkage allowance of the outer ring 50.
Thereby, even if the maximum load torque acts on the rotor 11, it is possible to ensure the rigidity capable of withstanding the centrifugal force due to the rotation of the rotor 11 and the magnetic attractive force from the stator 12.

  In addition, a plurality of bolt fastening holes 36 that are equally distributed in the circumferential direction and communicate with bolt through holes 35a formed in the spoke pins 35 are formed in the inner peripheral portions of the inner plates 31A and 31B, respectively, and an external drive shaft (for example, , And a transmission input shaft of the vehicle, etc., are fixed with bolts 45 to a shaft portion 55 (see FIG. 8).

  The shaft portion 55 has a flange portion 56 whose diameter is increased toward the inner peripheral portion of the laminated body 71. The flange portion 56 is formed with a step portion 57 having a large-diameter flange portion 56a located on one side in the axial direction and a small-diameter flange portion 56b located on the other side in the axial direction adjacent to the large-diameter flange portion 56a. The diameter flange portion 56a supports the side surface of the inner plate 31A from one side in the axial direction, and the small diameter flange portion 56b supports the inner peripheral portions of the inner plates 31A and 31B. The mounting is performed by pressing inner plates 31A and 31B sandwiching the spoke pins 35 to the stepped portion 57 and fastening bolts 45 to bolt holes (not shown) formed in the large-diameter flange portion 56a from the inner plate 31B side. The shaft portion 55 and the inner plates 31A and 31B are fixed integrally and the rotor 11 is assembled.

  Here, in the axial gap type motor 10 of the present embodiment, as shown in FIG. 8, an axial refrigerant path 91 is formed concentrically with the rotation axis O in the shaft portion 55 of the rotor 11, and the axial refrigerant. A radial refrigerant path 92a branched from the path 91 and penetrating the small diameter flange part 56b of the flange part 56 is formed. The radial refrigerant path 92a is formed at a position corresponding to the spoke pin 35 accommodated in at least one of the plurality of magnetic flux short-circuit suppressing portions 73,. Further, the spoke pin 35 is formed with a spoke pin through passage 93 that communicates with the radial refrigerant passage 92 a and penetrates the center. Further, the outermost layer 71 a of the laminate 71 and the die cast ring 33 are connected to the spoke pin through passage 93. An outer diameter side through-hole 96 drilled on the outer diameter side is formed. The outer diameter side through-hole 96 communicates with a guide passage 97 formed between the concave groove formed on the inner peripheral surface of the outer ring 50 so as to extend in the axial direction and the outer peripheral surface of the die cast string 33.

In the present embodiment, a cooling passage 90 is configured by the radial direction refrigerant passage 92a, the spoke pin through passage 93, and the outer diameter side through hole 96, and the refrigerant supplied from the axial refrigerant passage 91 of the shaft portion 55 is shown in FIG. As shown by the arrows, the air scatters from the opening 98 facing the stator 11 through the guide passage 97 through the cooling passage 90. The opening 98 is located on the outer diameter side of the air gap forming region 25 that forms an air gap between the yoke portion 42 of the rotor 11 and the teeth 22 of the stator 12, and the refrigerant is further separated from the opening 98 by centrifugal force. Spatters to the outer diameter side.
In this embodiment, two cooling passages 90 and guide passages 97 are provided (see FIG. 3). However, the present invention is not limited to this, and it is sufficient that at least one is provided, and preferably two locations so as to avoid eccentricity. These are provided.

  According to the present embodiment described above, since the coolant is supplied to the stator 12 from the cooling passage 90 extending in the radial direction through the shaft portion 55 and the laminated body 71, it is necessary to provide a space for introducing the coolant in the stator 12 and the housing 13. There is no. Further, since the refrigerant is supplied to the stator 12 by the centrifugal force of the rotor 11, the supply amount is automatically adjusted according to the rotation speed, so that more refrigerant is generated when the rotor 11 is rotated at a high speed. Can be supplied. Further, since the cooling passage 90 is also formed in the laminated body 71, the refrigerant can be supplied to the stator 12 while avoiding the air gap formation region 25. As a result, it is possible to prevent the refrigerant from staying in the air gap formation region 25 and causing the refrigerant to become friction and cause motor loss.

  Further, according to the present embodiment, the guide passage 97 that communicates with the cooling passage 90 and extends toward the stator 12 is provided on the inner peripheral surface of the outer ring 50, so that the stator 12 can be cooled while avoiding the air gap formation region 25. Can do.

Second Embodiment
Next, an axial gap type motor 10 according to a second embodiment of the present invention will be described with reference to FIG. In the figure, the same or equivalent components as those in the first embodiment are denoted by the same or equivalent reference numerals, and description thereof is omitted.
The stator 12 of the present embodiment is inclined toward the rotor 11 over the entire circumference so that the outer peripheral transition portion 23a of the winding 23 wound around the teeth 22 of the stator 12 can be easily applied with the refrigerant supplied from the guide passage 97. It has been.

The outer peripheral transition portion 23 a is formed so as not to contact the rotor 11 and to cover the outer peripheral portion of the rotor 11 as long as the outer peripheral transition portions 23 a and 23 a located on both sides in the axial direction with respect to the rotor 11 do not contact each other.
Thereby, the refrigerant | coolant scattered by the centrifugal force from the opening part 98 of the guide channel | path 97 can be effectively applied to the outer periphery transition part 23a, and the stator 12 can be cooled efficiently.

<Third Embodiment>
Next, an axial gap type motor 10 according to a third embodiment of the present invention will be described with reference to FIGS. In the figure, the same or equivalent components as those in the first embodiment are denoted by the same or equivalent reference numerals, and description thereof is omitted.
In this embodiment, a pair of annular guide members 100 </ b> A and 100 </ b> B that guide the refrigerant scattered from the guide passage 97 to the outer diameter side by centrifugal force to the outer peripheral transition portion 23 a of the stator 12 covers the entire circumference of the rotor 11. Is provided.

  The annular guide members 100A and 100B are close to the outer diameter side of the outer ring 50 in a non-contact state so as to cover the gap between the stator 12 and the rotor 11 on one axial side and between the stator 12 and the rotor 11 on the other axial side. Be placed. The annular guide members 100 </ b> A and 100 </ b> B form an arcuate guide surface 101 whose inner peripheral surface is curved toward the outer peripheral transition portion 23 a of the winding 23, and the axially outer end portion 102 of the guide surface 101 is the teeth 22. It is located on the outer side in the axial direction than the tip surface.

The annular guide members 100A and 100B configured as described above are arranged on the guide surface 101 as shown by arrows in FIG. 11 in the direction in which the refrigerant scattered from the opening 98 of the guide passage 97 to the outer diameter side by centrifugal force. It is converted to the outer periphery crossing part 23a. As a result, the stator 12 can be efficiently cooled even if the refrigerant scatters due to centrifugal force when the rotor 11 rotates at high speed. Note that the guide surface 101 does not necessarily have an arc shape, and may have a tapered shape that is inclined toward the stator 12.
Further, since the axially outer end portion 102 of the guide surface 101 of the annular guide members 100A and 100B is positioned axially outside the tip end surface of the tooth 22, the refrigerant supplied from the guide surface 101 is an air gap forming region. Therefore, it is possible to prevent the motor from being lost due to the stagnation of the refrigerant and the friction of the refrigerant.

<Fourth embodiment>
Next, an axial gap type motor 10 according to a fourth embodiment of the present invention will be described with reference to FIG. In the figure, the same or equivalent components as those in the first embodiment are denoted by the same or equivalent reference numerals, and description thereof is omitted.
In the present embodiment, an upper guide member 110 is provided at the upper portion of the housing 13 to receive the refrigerant scattered from the guide passage 97 to the outer diameter side and drop it onto the stator 12 by the gravity of the refrigerant.

  The upper guide member 110 has an axial length substantially equal to the axial length of the housing 13, and is disposed above the rotor 11 within a range of 180 degrees or less with respect to the entire circumference of the rotor 11. In addition, the inner peripheral surface of the upper guide member 110 has an outer peripheral transition portion of the winding 23 at an axial position between the stator 12 and the rotor 11 on one axial side and between the stator 12 and the rotor 11 on the other axial side. A pair of guide recesses 111 that incline toward 23a, and the axially outer end 112 of the guide recess 111 is axially outer than the distal end surface of the tooth 22 and is positioned substantially at the top of the outer peripheral crossing 23a. is doing.

  The upper guide member 110 configured as described above receives the refrigerant scattered on the outer diameter side by the centrifugal force from the opening 98 of the guide passage 97 by the guide concave portion 111, and as shown by the arrow in FIG. It is dripped from the axial direction outer side end part 112 to the outer periphery crossing part 23a of the coil | winding 23. As a result, the stator 12 can be efficiently cooled even if the refrigerant scatters due to centrifugal force when the rotor 11 rotates at high speed. Further, since the axially outer end 112 of the guide recess 111 of the upper guide member 110 is positioned axially outside of the tip surface of the tooth 22, the refrigerant supplied from the guide recess 111 enters the air gap formation region 25. It is possible to prevent the refrigerant from stagnation and causing the refrigerant to become friction and cause motor loss.

<Fifth Embodiment>
Next, an axial gap motor 10 according to a fifth embodiment of the present invention will be described with reference to FIG. In the figure, the same or equivalent components as those in the first embodiment are denoted by the same or equivalent reference numerals, and description thereof is omitted.
In the present embodiment, an outer ring through hole 99 that communicates with the outer diameter side through hole 96 formed in the die caster string 33 that constitutes the cooling passage 20 is provided so as to penetrate the outer ring 50 in the radial direction. An upper guide member 120 is provided on the upper portion to receive the refrigerant scattered from the outer ring through hole 99 to the outer diameter side and drop it onto the stator 12 by the gravity of the refrigerant.

  The upper guide member 120 has an axial length substantially equal to the axial length of the housing 13, and is disposed above the rotor 11 within a range of 180 degrees or less with respect to the entire circumference of the rotor 11. Further, the inner peripheral surface of the upper guide member 120 has a guide concave portion 121 having a tapered structure on both sides with the outermost diameter through the outer ring through hole 99 being the deepest portion 123, and the shaft of the guide concave portion 121. The direction outer side end part 122 is located on the outer side in the axial direction from the front end surface of the tooth 22 and in the vicinity of the top part of the outer peripheral crossing part 23a.

  The upper guide member 120 configured as described above receives the refrigerant scattered from the outer ring through-hole 99 to the outer diameter side by centrifugal force by the guide recess 121, and as indicated by the arrow in FIG. It is dropped from the outer end portion 122 to the outer peripheral transition portion 23 a of the winding 23. As a result, the stator 12 can be efficiently cooled even if the refrigerant scatters due to centrifugal force when the rotor 11 rotates at high speed. Further, since the axially outer end 122 of the guide recess 121 is located on the axially outer side than the tip end surface of the tooth 22, the refrigerant supplied from the guide recess 121 stays in the air gap formation region 25. It is possible to prevent the refrigerant from becoming friction and causing motor loss.

In addition, this invention is not limited to what was illustrated to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.
For example, the cooling passage 90 formed in the laminated body 71 is the spoke pin penetration passage 93 that penetrates the center of the spoke pin 35, but the spoke pin 35 is not necessarily used, and the magnetic flux short-circuit suppressing unit 73 is used as it is. It may be used as Further, as shown in FIG. 14A, the corner portion of the main magnet portion 41 is chamfered in an arc shape so that a space formed between the main magnet portion insertion hole 72 and the corner portion of the main magnet portion 41 is formed. As shown in FIG. 14B, a substantially cylindrical hole extending in the radial direction is provided at the corner portion of the main magnet portion insertion hole 72 so that the corner portion of the main magnet portion insertion hole 72 A space formed between the magnet portion 41 may be used as the cooling passage 90.

Furthermore, in addition to the first to fifth embodiments, when it is desired to cool the inner peripheral portion of the stator 12, the radial refrigerant path 92 b is formed in the flange portion 56 facing the stator 12, and the opening of the radial refrigerant path 92 b is formed. 920 can be configured to open to the inner peripheral crossing portion 23b of the winding 23 wound around the teeth 22 of the stator 12. At this time, a protrusion 921 that protrudes in the radial direction over the entire circumference is provided inside the opening 920 in the axial direction. Further, the protruding portion 921 is located on the outer side in the axial direction from the air gap forming region 25 that forms an air gap between the yoke portion 42 of the rotor 11 and the teeth 22 of the stator 12.
Thus, the refrigerant is supplied to the inner peripheral crossing portion 23b of the winding 23 wound around the teeth 22 of the stator 12 while avoiding the refrigerant from staying in the air gap formation region 25 and causing friction, and the stator 12 The inner periphery can also be cooled.

  Further, the refrigerant accumulated in the lower portion of the housing 13 may be circulated to the cooling passage 90 via an oil pump and a feed pipe after passing through a strainer (not shown).

DESCRIPTION OF SYMBOLS 10 Axial gap type motor 11 Rotor 12 Stator 13 Housing 21 Stator yoke part 22 Teeth 23 Winding 23a Outer peripheral part 23b Inner peripheral part 25 Air gap formation area 33 Die string (outer diameter side pressing member)
35 Spoke Pin 41 Main Magnet Part 42 Yoke Part 43 Sub Magnet Part 50 Outer Ring (Outer Diameter Side Pressing Member)
55 Shaft portion 56 Flange portion 60 Magnetic steel sheet 71 Laminate 73 Magnetic flux short-circuit suppressing portion 90 Cooling passage 91 Axial refrigerant passage 92a Radial refrigerant passage 92b Radial refrigerant passage 93 Spoke pin through passage 96 Outer diameter side through hole 97 Guide passage 99 Outer ring through hole (through hole)
100A annular guide member 100B annular guide member 110 upper guide member 120 upper guide member 920 opening 921 protrusion O rotating shaft

Claims (11)

A rotor rotatable around a rotation axis;
Rotating from a position at a predetermined interval in the circumferential direction on the opposed surface of the substantially yoke-shaped stator yoke portion and the stator yoke portion facing the rotor, which is disposed to face the rotor from at least one of the rotation axis directions. An axial gap type motor comprising: a stator including a plurality of teeth projecting toward the rotor along an axial direction and extending in a radial direction; and a winding attached to the teeth;
The rotor is
A plurality of main magnet portions magnetized in the rotation axis direction and arranged at predetermined intervals in the circumferential direction;
A plurality of yoke portions, each of which is constituted by a laminate in which a tape-shaped electromagnetic steel sheet is wound, and is disposed on at least one of the plurality of main magnet portions in the rotation axis direction;
A shaft portion attached to the inner peripheral side of the laminate, and
The laminated body and the shaft portion are provided with a cooling passage extending in a radial direction,
An axial gap motor, wherein a refrigerant is supplied to the stator through the cooling passage.   The refrigerant supplied through the cooling passage is supplied to the stator from an outer diameter side from an air gap forming region that forms an air gap between the yoke portion of the rotor and the teeth of the stator. The axial gap type motor according to claim 1. The rotor further includes an outer diameter side pressing member attached to the outer diameter side of the laminate,
The axial gap type motor according to claim 1, wherein a guide passage that communicates with the cooling passage and extends toward the stator is provided in the outer diameter side pressing member.   4. The axial gap motor according to claim 3, wherein an outer periphery crossing portion of the winding is inclined toward the rotor over the entire circumference so that the refrigerant supplied from the guide passage is easily applied. . A housing that holds the stator and covers an outer periphery of the rotor;
The said housing is provided with the cyclic | annular guide member which guides the refrigerant | coolant splashed to the outer diameter side from the said guide channel | path to the said stator side so that the perimeter of the said rotor may be covered. Axial gap type motor. A housing that holds the stator and covers an outer periphery of the rotor;
4. The axial guide according to claim 3, wherein an upper guide member is provided on the housing, the upper guide member receiving the refrigerant scattered from the guide passage toward the outer diameter side and dropping the refrigerant onto the stator by gravity of the refrigerant. Gap type motor. A housing that holds the stator and covers an outer periphery of the rotor;
The rotor further includes an outer diameter side pressing member attached to the outer diameter side of the laminate,
The outer diameter side pressing member is provided with a through hole that communicates with the cooling passage and penetrates to the outer diameter side,
The upper portion of the housing is provided with an upper guide member that receives the refrigerant scattered from the through hole toward the outer diameter side and drops the refrigerant onto the stator by gravity of the refrigerant. Axial gap type motor. The laminate is provided with a magnetic flux short-circuit suppressing portion between the main magnet portions adjacent in the circumferential direction,
In the magnet short-circuit suppressing portion, a spoke pin inserted from the inner diameter side of the laminate is accommodated,
The axial gap type according to any one of claims 1 to 7, wherein the spoke pin is provided with a spoke pin through passage that extends in a radial direction and constitutes a part of the cooling passage. motor. The laminate is provided with a main magnet part insertion hole for accommodating the main magnet part,
The space formed between the main magnet part insertion hole and the main magnet part accommodated in the main magnet part insertion hole constitutes a part of the cooling passage. An axial gap type motor given in any 1 paragraph. The shaft portion further includes a radial refrigerant path penetrating toward an inner periphery of the winding, and a refrigerant scattered from the opening adjacent to the opening of the radial refrigerant path. An annular protrusion that leads to the crossover is provided,
The protruding portion is located on the inner side in the axial direction with respect to the opening, and is located outside an air gap forming region for forming an air gap between the yoke portion of the rotor and the teeth of the stator. The axial gap type motor according to any one of claims 1 to 9. A housing that holds the stator and covers an outer periphery of the rotor;
11. The axial according to claim 1, wherein the refrigerant accumulated in a lower portion of the housing is circulated through the cooling passage through an oil pump and a feed pipe after passing through a strainer. Gap type motor.

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