JP2004357352A - Stator structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator structure of a double-axis multilayer motor capable of suppressing loss caused by an eddy current, by using no magnetic body in a magnetic path when assembling cores to form a stator. <P>SOLUTION: The stator structure of the double-axis multilayer motor comprises a stator 4 in which teeth 30 where a coil 29 is wound on a core 28 and a post 17 of non-magnetic body comprising a coolant flow path 31 are arranged through a resin layer, an inner rotor 3 disposed on the inner peripheral side of the stator 4, and an outer rotor 6 disposed on the outer peripheral side of the stator 4. A first collar 20 on the rear side and a second collar 25 on the front side striding two adjoining teeth 30 are respectively fastened to each end of the posts 17 using short bolts 21, 22, 26, and 27, positioning and fixing each teeth 30. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a multi-shaft multi-layer motor, and more particularly to a stator structure of a multi-shaft multi-layer motor in which one rotor drives two rotors.
[0002]
[Prior art]
This type of multi-axis multilayer motor is disclosed in, for example, Japanese Patent Application Laid-Open No. 2001-359261. The multi-axis multilayer motor 101 has a cross-sectional view taken along a plane including a central axis in FIG. , A case 102, a stator 103, an inner rotor 104 disposed on an inner peripheral side of the stator 103, and an outer rotor 105 disposed on an outer peripheral side of the stator 103.
[0003]
The inner rotor 103 is mounted on a first rotating shaft 106 arranged at the center of the case 102. One end on the front side of the first rotating shaft 106 is rotatably supported on the rotor case 107 via a bearing 108, and the other end on the rear side is supported on the case 102 via a bearing 109. .
The stator 104 is a split coil type stator in which teeth 110 each formed by winding a coil (not shown) around a core are arranged at predetermined intervals in a circumferential direction. The teeth 110 are positioned and fixed with one end face on the front side sandwiched by the stator support member 111 on the front side and the other end face sandwiched by the stator support member 112 on the rear side.
The front and rear stator support members 111 and 112 are nonmagnetic materials and are made of a material having a high thermal conductivity such as aluminum.
[0004]
Each tooth 110 is provided at intervals in the circumferential direction of the stator support member 112 and has a substantially T-shape in a radial cross section, and one positioning protrusion 114 and a positioning protrusion 114 adjacent thereto. Are fitted in close contact with them.
Further, each tooth 110 is sandwiched between the stator support member 111 and the stator support member 112 under the action of a plurality of fixing bolts 115 that penetrate the case 102 and the stator support member 112 and are screwed to the stator support member 111. Done.
[0005]
The through holes of the rear and front stator support members 111 and 112 into which the fixing bolts 115 are inserted, and the through holes formed by the semicircular grooves provided at the bases of the adjacent teeth 110, respectively. A sealing member made of a synthetic resin or the like is used to form a continuous sleeve, and is formed in a passage 116 through which a cooling medium flows between the outer peripheral surface of the fixing bolt 115 and the inner peripheral surface of each through hole.
[0006]
The passage 116 communicates with a passage 117 provided in the positioning protrusion 114 via a communication passage (not shown), whereby the cooling medium flows through the passages 116 and 117 to cool the teeth 110. .
[0007]
The outer rotor 105 is mounted and supported inside a rotor case 107 arranged in the case 102. The outer bearing portion 118 of the outer bearing portion 118 and the inner bearing portion 119 on the front side of the rotor case 107 is rotatably supported on the case 102 via a front case bearing 120. Further, a second rotating shaft 121 is integrally connected to the outer bearing portion 118 by spline fitting, and the second rotating shaft is rotated to the case 102 by a pair of bearings 122 arranged apart from each other in the axial direction. It is freely supported.
The second rotating shaft 121 is a hollow shaft, and a shaft end on the front side of the first rotating shaft 106 is extended inside the second rotating shaft 121 to form a mutually double shaft.
[0008]
On the other hand, the inner bearing portion 119 is rotatable on the outer peripheral side with respect to the front-side stator support member 111 via the front stator bearing 123 and on the inner peripheral side with respect to the first rotating shaft 106 via the front case bearing 108. It is supported by.
Therefore, the rotation of the rotor case 107 by the outer rotor 105 causes the second rotating shaft 121 to rotate integrally therewith.
[0009]
Such a multi-axis multilayer motor 101 connects a coil of a stator 104 in a multi-phase, and applies a composite current obtained by combining a current for controlling the rotation of the inner rotor 103 and a current for controlling the rotation of the outer rotor 105 to the coil. By changing the supplied magnetic flux, the rotations of the inner rotor 103 and the outer rotor 105 can be controlled independently.
[0010]
[Problems to be solved by the invention]
However, according to various experimental studies by the present inventors, it has been found that the above-described multi-axis multilayer motor 101 has points to be improved as described below. That is, in the above-described multi-axis multi-layer motor 101, the fixing bolt 115, which is a magnetic material, extends over the entire length of the teeth 110 serving as a magnetic path when the motor is energized. There is a problem that an eddy current is generated in the inside and a relatively large loss occurs.
[0011]
SUMMARY OF THE INVENTION An object of the present invention is to provide a stator structure of a multi-axis multilayer motor that can effectively suppress losses due to the generation of eddy current when assembling teeth to form a stator.
[0012]
[Means for Solving the Problems]
The invention according to claim 1, which achieves the above object, has a tooth in which a coil is wound around a core, and a stator in which a support made of a non-magnetic material having a coolant channel is arranged via a resin layer, In a stator structure of a multi-axis multilayer motor including an inner rotor disposed on the inner peripheral side of the stator and an outer rotor disposed on the outer peripheral side of the stator, the stator extends over two adjacent teeth. It is characterized in that each tooth is positioned and fixed by tightening each of the located first rear collar and front second collar to the respective end of each pillar with short bolts. It is assumed that.
[0013]
According to a second aspect of the present invention, in the stator structure of the multi-axis multi-layer motor according to the first aspect, the strut is made of a material having high thermal conductivity, and the strut contacts the first and second collars. The distance between the surfaces is shorter than the length of the core.
[0014]
According to a third aspect of the present invention, in the stator structure of the multi-axis multilayer motor according to the first or second aspect, in the radial cross section of the stator, each of the inscribed circle and the circumscribed circle of the pillar is replaced with the inscribed circle of the core. And circumscribed circles or slightly depressed from their circumscribed circles.
[0015]
【The invention's effect】
According to the invention according to the first aspect, the teeth are assembled based on fastening the first collar and the second collar to both ends of the column made of a non-magnetic material with short bolts, so that the related art is achieved. Therefore, the total length of the bolts can be made much shorter than this, which greatly reduces the volume of the magnetic bolts that are present in the magnetic path generated when the stator coil is energized. As a result, it is possible to effectively prevent the loss due to the eddy current.
[0016]
According to the second aspect of the present invention, since the pillar is made of a material having a high thermal conductivity, each part of the tooth coil and the core can be quickly cooled. In addition, by making the distance between the contact surfaces of the pillars with the first and second collars shorter than the length of the core, the core of each tooth is stabilized between the first collar and the second collar. It can be securely fixed under a strong clamping force.
[0017]
According to the third aspect of the present invention, the area of contact between the support and the teeth can be made sufficiently large, so that the entire teeth can be uniformly and efficiently cooled.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of a stator structure of a multi-axis multilayer motor according to the present invention will be described with reference to the drawings.
[0019]
FIG. 1 is a cross-sectional view in a plane including a central axis of a multi-axis multilayer motor showing an embodiment of the present invention.
The multi-shaft multilayer motor 1 includes an inner rotor 3 connected to a first rotating shaft 2, a stator 4 disposed on an outer peripheral side of the inner rotor 3, and a second rotating shaft disposed on an outer peripheral side of the stator 4. And an outer rotor 6 connected to the first rotary shaft 5, wherein the first rotary shaft 2 is disposed on the outer peripheral side of the second rotary shaft 5.
In the figure, the left side is the rear side and the right side is the front side.
[0020]
Here, a front end of the stator 4 is connected to and supported by the stator shaft 7, and a rear end is connected to and supported by the stator rear disk 8. The outer rotor 6 is attached to a rotor case 9 disposed on the outer peripheral side thereof. A front end of the rotor case 9 is connected to and supported by a rotor front disk 10, and a rear end of the rotor case 9 is mounted on the rotor rear disk 11. Connect and support.
[0021]
Further, a bearing 12 is attached to a rear disk 11 which is drivingly connected to the rear end of the first rotary shaft 2 at the rear side of the second rotary shaft 5 disposed on the inner peripheral side of the first rotary shaft 2. While being rotatably supported via a bearing, a front portion thereof is rotatably supported via a bearing 13 on a stator shaft 7 disposed on an outer peripheral side thereof.
By the way, the rotor disk 11 connected to the second rotating shaft 5 is supported by the bearing 12 on the first rotating shaft 2 and rotatably supported on a motor rear case (not shown) via a bearing 14. It is rotatably supported on the stator rear disk 8 via a bearing 15.
The rotor case 9 is rotatably supported on the stator shaft 7 by a bearing 16 via a rotor front disk 10 connected to a front end of the rotor case 9.
[0022]
Different numbers of permanent magnets are embedded in the inner rotor 3 and the outer rotor 6 of the multi-shaft multilayer motor 1 so as to have different numbers of pole pairs, and the rotation of the inner rotor 3 is controlled by coils of a stator connected in multiple phases. A composite current, which is a combination of a current of the number of phases for controlling the rotation of the outer rotor 6 and a current of the number of phases for controlling the rotation of the outer rotor 6, is applied. Thus, the inner rotor 3 and the outer rotor 6 are driven at mutually different rotation speeds.
[0023]
Here, the stator 4 has a substantially T-shaped cross-sectional shape, as is apparent from FIG. 2 showing a cross-section along the line AA in FIG. 29 is wound in a step-like manner, and has a plurality of teeth 30 arranged at predetermined intervals in the circumferential direction, and has a cross-sectional shape that embeds between adjacent teeth. Adjacent pillars 17 are alternately arranged in the circumferential direction via a resin layer having good thermal conductivity in a teeth division structure. The pillars 17 have a coolant channel 31 extending over the entire length thereof.
[0024]
Each of two teeth adjacent to each other, which are circumferentially spaced from each other, are straddled in the bolt holes 18 and 19 at the rear end of the nonmagnetic support 17 that forms a part of the stator 4. The same number as the teeth in the circumferential direction, penetrates the fan-shaped first collar 20 made of a high-strength and high-rigidity material, and screws and bolts 21 and 22 of the minimum length as necessary are tightened. At the same time, the bolts 26 and 27 are screwed into the bolt holes 23 and 24 at the front end by passing through the second collar 25 having the same configuration, and the teeth are fastened. The stator 4 is configured to be sandwiched by the second collar 25. As a result, the volume of the magnetic body in the magnetic path can be significantly reduced, and it is possible to prevent eddy current from being generated in the column 17 even when the coil is energized, thereby preventing loss.
[0025]
In this case, as shown in FIG. 3, the distance L between the contact surfaces of the columns 17 with the first and second collars 20 and 25 is formed to be shorter than the length M of the core 28. It is preferable to increase the holding force of the collars 20 and 25 against the teeth 30.
[0026]
The refrigerant flow path 31 formed in the support column 17 includes a refrigerant introduction path, a refrigerant distribution lid member (gallery plate front), a refrigerant distribution plate member (separator), a refrigerant U-turn lid member, and the like provided in a mold resin portion (not shown). A cooling system is formed based on the combination with the parts, and the teeth 30 are cooled.
[0027]
Preferably, such pillars 17 are made of a material such as aluminum or copper having excellent thermal conductivity. Thereby, the teeth 30 can be cooled more efficiently. More preferably, as shown in FIG. 2, in the radial cross-section of the stator, each of the inner peripheral edge and the outer peripheral edge of the column 17 is slightly different from each of the inscribed circle and the circumscribed circle for the plurality of teeth 30. Position it indented. According to this, the entire area of the teeth 30 can be uniformly and efficiently cooled by maximizing the area where the pillars 17 and the teeth 30 are in contact with each other via the resin layer having good thermal conductivity. .
[0028]
When the inner peripheral edge and the outer peripheral edge of one or both of the support 17 and the teeth 30 are not arc-shaped, the inscribed circle and the circumscribed circle of the support 17 are respectively converted into the inscribed circle and the circumscribed circle of the plurality of teeth 30. Position slightly recessed. Also by this, the area where the support 17 and the teeth 30 are in contact with each other can be maximized, so that the entire teeth 30 can be uniformly and efficiently cooled.
[0029]
It should be noted that the present invention is not limited only to the above-described embodiment, and various modifications or changes can be made.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view including a central axis of a multi-axis multilayer motor showing an embodiment of the present invention.
FIG. 2 is a radial sectional view of the stator shown in FIG. 1;
FIG. 3 is a schematic view showing a mode of teeth fastening by a collar.
FIG. 4 is a cross-sectional view including a center axis of a conventional multi-axis multilayer motor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Multi-shaft multilayer motor 2 First rotating shaft 3 Inner rotor 4 Stator 5 Second rotating shaft 6 Outer rotor 7 Stator shaft 8 Stator rear disk 9 Rotor case 10 Rotor front disk 11 Rotor disk 12 Bearing 13 Bearing 14 Bearing 15 Bearing 16 Bearing 17 Post 18 Bolt hole 19 Bolt hole 20 First collar 21 Bolt 22 Bolt 23 Bolt hole 24 Bolt hole 25 Second collar 26 Bolt 27 Bolt 28 Core 29 Coil 30 Teeth 31 Cooling water channel

Claims (3)

A stator in which a tooth having a coil wound around a core, and a support made of a non-magnetic material having a coolant channel are arranged via a resin layer, and an inner rotor arranged on the inner peripheral side of the stator. , A stator structure of a multi-axis multilayer motor comprising an outer rotor disposed on the outer peripheral side of the stator,
Each of the first collar on the rear side and the second collar on the front side located across two mutually adjacent teeth are tightened to the respective ends of each support by short bolts. The stator structure of a multi-axis multilayer motor in which the teeth are positioned and fixed. 2. The multi-axial multilayer according to claim 1, wherein the support is made of a material having a high thermal conductivity, and a distance between contact surfaces of the support with the first and second collars is shorter than a length of the core. Motor stator structure. 2. The method according to claim 1, wherein the inscribed circle and the circumscribed circle of the strut are located on or slightly depressed from the inscribed circle and the circumscribed circle of the core in the radial cross section of the stator. Or a stator structure of the multi-axis multilayer motor according to 2.

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