JP5388636B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine, and more particularly, to a rotating electrical machine having a cooling structure for cooling a stator.

  Conventionally, for example, a rotating electrical machine described in Patent Document 1 is known as a rotating electrical machine having a cooling structure for cooling a stator. As shown in FIGS. 8 and 9, the rotating electrical machine 200 includes a stator 205 in which a coil 204 is mounted on a stator core 203 in which slots 201 and teeth 202 are alternately formed on an inner peripheral surface, and an inner peripheral portion of the stator 205. And a rotatable rotor 206, a stator 205, and a housing 207 that accommodates the rotor 206.

Further, as a structure for cooling the stator 205, a plate 208 that closes the slot 201 is disposed in the vicinity of the opening of the slot 201, and molds are disposed on the inner peripheral side and the outer peripheral side of the plate 208 and the stator core 203, and resin is provided there. Partition walls 209 and 209 are formed between both ends of the stator 205 and the side walls 212 and 212 of the housing 207, and the housing 207 has a stator housing chamber 210 for housing the stator 205 and a rotor housing chamber for housing the rotor 206. It is divided into 211.
In addition, it is described that a cooling refrigerant is introduced into the housing 207 from the introduction port 213 formed in the stator housing chamber 210, the refrigerant is led out to the outside through the outlet port 214, and the stator 205 is cooled.

JP 2003-61285 A

However, in the rotating electrical machine 200 described in Patent Document 1, when the stator core 203 has a laminated structure in which magnetic plates are laminated, the refrigerant introduced into the stator accommodating chamber 210 may leak into the rotor accommodating chamber 211 from the gap between the laminates. there were. When the leaked refrigerant adheres to the rotor 206, the mechanical loss increases, and when the refrigerant is discharged from the rotor accommodating chamber 211 to the outside, a separate discharge mechanism is required.
Moreover, since the partition walls 209 and 209 at both ends of the plate 208 are formed by filling a resin using a mold, the structure is complicated and the manufacturing process is complicated.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rotating electrical machine that can prevent the refrigerant in the stator housing chamber from leaking into the rotor housing chamber with a simple configuration.

In order to achieve the above object, the invention described in claim 1
A stator core (for example, a stator core 110 in an embodiment to be described later) in which a plurality of slots (for example, a slot 112 in an embodiment to be described later) and teeth (for example, a tooth 111 in an embodiment to be described later) are alternately formed on the inner peripheral surface is provided. A stator (for example, a stator 11 in an embodiment described later) on which a coil (for example, a coil 114 in an embodiment described later) is mounted, and an air gap (for example, an air gap S in an embodiment described later) on the inner peripheral side of the stator. ) And a rotatable electric machine (for example, a rotor 12 in an embodiment described later) and a housing (for example, a housing 13 in an embodiment described later) that houses the stator and the rotor. For example, a rotating electrical machine 10) in an embodiment described later,
The air gap includes a stator accommodating chamber (for example, a stator accommodating chamber 20 in an embodiment described later) and a rotor accommodating chamber (for example, a rotor accommodating chamber 30 in an embodiment described later) for accommodating the rotor. A partition member (for example, a partition member 17 in an embodiment described later) that is divided liquid-tightly is provided.
In the stator housing chamber, an introduction port (for example, an introduction port 131a in an embodiment described later) for introducing a refrigerant into the housing from the outside, and an outlet port (for example, described later) for extracting the refrigerant from the inside of the housing to the outside. The outlet 131b) in the embodiment is provided,
The partition member is provided with at least one rib (for example, a rib 175 in an embodiment described later) continuously extending along the axial direction at a position facing the slot on the outer circumferential surface .
The teeth have a circumferential end surface extending linearly from the bottom of the slot to the tooth tip surface when viewed from the axial direction,
The rib protrudes from the outer peripheral surface to a radially outer side than the tooth tip surface at a circumferential position between the adjacent teeth, and when viewed from the axial direction, the circumferential end surface of the tooth. Are formed in a substantially trapezoidal shape having both circumferential end surfaces facing each other.
It is characterized by that.

In addition to the configuration of the invention described in claim 1, the invention described in claim 2
The ribs are provided at all positions facing the slot.
It is characterized by that.

In addition to the configuration of the invention described in claim 1 or 2, the invention described in claim 3
The housing is provided with an annular support portion (for example, an annular support portion 133 in an embodiment described later) that supports the partition member on both sides in the axial direction of the partition member and on the inner diameter side.
The inner peripheral surface of the partition member is supported by the annular support portion via a seal member (for example, an O-ring 18 in an embodiment described later).
It is characterized by that.

In addition to the configuration of the invention according to any one of claims 1 to 3, the invention according to claim 4
The partition member is made of a resin material, and the rib is integrally formed by injection molding.
It is characterized by that.

In addition to the structure of the invention described in claim 4, the invention described in claim 5
Of the outer peripheral surface of the partition member, a portion where the rib is not formed fits in a tooth tip surface (for example, a tooth tip surface 111a in an embodiment described later),
It is characterized by that.

According to the first aspect of the present invention, the partition that divides the stator accommodating chamber and the rotor accommodating chamber in a liquid-tight manner is composed of a single cylindrical partition member, so that the refrigerant in the stator accommodating chamber is a simple structure and the rotor accommodating chamber It is possible to prevent leakage. Thereby, the mechanical loss by a refrigerant | coolant adhering to a rotor can be reduced, and efficiency can be improved. Further, since there is no need to provide a discharge mechanism for discharging the refrigerant from the rotor housing chamber to the outside, the rotating electrical machine can be reduced in size.
Furthermore, since the partition which divides | segments a stator storage chamber and a rotor storage chamber is comprised from one partition member, intensity | strength can be ensured with respect to the pressure from the radial direction outer side by a refrigerant | coolant. Further, since the partition wall member is provided with at least one rib extending in the axial direction at a position facing the stator slot on the outer peripheral surface, the strength can be further improved against pressure from the outside in the radial direction. Thereby, even if the pressure in the stator accommodating chamber increases, the refrigerant leakage to the rotor accommodating chamber due to the breakage or deformation of the partition member can be avoided, so that the refrigerant flow rate can be increased and the cooling performance can be improved.
Furthermore, the rib member and the teeth of the stator are in contact with each other, so that the partition member can be prevented from being rotated with the rotation of the rotor.

  According to the invention of claim 2, since the ribs are provided at all positions facing the slot, the strength can be further improved against the pressure from the outside in the radial direction. Thereby, the wall thickness of the partition member can be reduced to reduce the air gap between the stator and the rotor, and the increase in magnetic resistance due to the air gap can be suppressed.

  According to the third aspect of the present invention, when the refrigerant is supplied to the stator housing chamber, the refrigerant acts on the outer peripheral surface of the partition wall member, but the seal member contacts the inner peripheral surface of the partition wall member. Since the hydraulic pressure acts in the direction in which the sealing member is brought into close contact, the sealing performance can be improved. Further, the rib member prevents the partition member from being rotated along with the rotation of the rotor, so that the seal member can be prevented from being damaged due to wear.

  According to the invention of claim 4, since the partition member is made of a resin material and the ribs are integrally formed by injection molding, the partition member having the ribs can be easily manufactured.

  According to the fifth aspect of the present invention, even if a part of the partition wall member is deformed to the outer diameter side by fitting the portion of the outer peripheral surface of the partition wall member where the rib is not formed into the tooth tip surface by inlay fitting. Since it is supported by the front end surface, it is possible to avoid refrigerant leakage to the rotor housing chamber due to the breakage or deformation of the partition wall member even when the pressure of the stator housing chamber becomes high, so that the refrigerant flow rate is increased and the cooling performance is improved. be able to.

It is an axial sectional view of an embodiment of a rotating electrical machine according to the present invention, and is a sectional view taken along line II in FIG. FIG. 2 is a cross-sectional view in the direction perpendicular to the axis of the rotating electrical machine shown in FIG. 1. FIG. 3 is a cross-sectional view perpendicular to the axis for explaining a case where a rotor rotates clockwise in the rotating electrical machine of FIG. 2. It is an axial sectional view explaining the deformation mode of the partition member in the rotating electrical machine shown in FIG. It is a perspective view of the partition member which attached the strain gauge used for the pressure test. It is a figure which shows a pressure | voltage resistant test apparatus, (a) is an axial orthogonal direction sectional view of a pressure | voltage resistant test apparatus, (b) is the BB sectional drawing of (a). It is a figure which shows the deformation | transformation of the partition member in a pressure | voltage resistant test apparatus. 3 is an axial sectional view of a rotating electrical machine described in Patent Document 1. FIG. FIG. 6 is a partial cross-sectional view in a direction perpendicular to the axis of a stator of a rotating electrical machine described in Patent Document 1.

  Hereinafter, each embodiment of the rotating electrical machine according to the present invention will be described in detail with reference to the accompanying drawings.

  The rotating electrical machine 10 according to the present embodiment includes, for example, as shown in FIGS. 1 and 2, a stator 11, a rotor 12 that is disposed to face the inner peripheral side of the stator 11 via an air gap S, and the stator 11 and the rotor. And a housing 13 that accommodates the housing 12.

  The housing 13 includes a cylindrical cylindrical wall portion 131, side wall portions 132 and 132 in which both sides of the cylindrical wall portion 131 are liquid-tightly closed via O-rings 14 and 14, and axially inner sides of the side wall portions 132 and 132. An annular support portion 133 that is joined and has a smaller diameter than the cylindrical wall portion 131 and a shorter axial length is formed. The cylindrical wall 131 is provided with an introduction port 131a for introducing a refrigerant from the outside to the inside of the housing and an outlet port 131b for drawing the refrigerant from the inside of the housing to the outside. The stator 11 is fixed to the inner peripheral surface of the cylindrical wall 131.

  The stator 11 is wound around each tooth 111 of the stator core 110 and a stator core 110 in which a plurality of teeth 111 protruding at a predetermined interval are provided on the inner diameter side, and the teeth 111 and the slots 112 are alternately formed in the circumferential direction. The coil 114 is configured. The stator core 110 is configured by laminating a plurality of layers of electromagnetic steel plates.

  The rotor 12 includes a rotor core 120 that can rotate integrally with the rotary shaft 15, and permanent magnets (not shown) that are arranged in the rotor core 120 at equal intervals in the circumferential direction. The rotating shaft 15 is rotatably supported on the side wall portions 132 and 132 of the housing 13 via bearings 16 and 16, and the rotor core 120 generates a reaction force against the rotating magnetic flux applied by the stator core 110 and It can rotate as a unit.

  Here, in the rotating electrical machine 10 according to the present embodiment, one cylindrical partition member 17 is provided in the air gap S formed between the inner peripheral surface of the stator 11 and the outer peripheral surface of the rotor 12. The inner peripheral surface of each part is supported by the annular support parts 133 and 133 of the housing 13 via O-rings 18 and 18. The partition member 17 is made of a non-magnetic and non-conductive material, such as resin or ceramic, and has an axial length substantially equal to the distance between the side wall portions 132 and 132 of the housing 13 facing in the axial direction. The thickness (the length in the radial direction) is set to a thickness shorter than the air gap S so as to ensure a predetermined strength.

  A plurality of ribs 175 integrally formed by injection molding and extending in the axial direction are provided on the outer peripheral surface of the partition wall member 17 at equal intervals in the circumferential direction, and each rib 175 is disposed corresponding to the slot 112 of the stator 11. Has been. Each rib 175 has a substantially trapezoidal cross-sectional shape and partially enters the slot 112. Abutting portions 177 and 177 are formed on both end surfaces of the rib 175 in the circumferential direction, and can abut on the circumferential end surfaces 111b and 111b of the tooth 111. Therefore, as shown in FIG. 3, if the rotor 12 rotates clockwise as indicated by an arrow, the partition member 17 also tries to rotate in the direction indicated by the arrow, but the contact portion 177 on the front side in the rotational direction. Comes into contact with the circumferential end surface 111b on the rear side in the rotational direction of the tooth 111, and its rotation is prevented.

  Moreover, the part in which the rib 175 is not formed among the outer peripheral surfaces of the partition member 17 is inlay-fitted with the teeth front end surface 111a which is the inner peripheral surface of the teeth 111. The partition member 17 configured as described above functions as a partition that divides the interior of the housing 13 into a stator housing chamber 20 that houses the stator 11 and a rotor housing chamber 30 that houses the rotor 12. The stator housing chamber 20 is liquid-tightly isolated from the rotor housing chamber 30 by O-rings 18 and 18 provided between the annular support portions 133 and 133.

  Then, an insulating refrigerant is supplied from an inlet 131a formed in the cylindrical wall 131 of the housing 13, and the stator 11 is cooled by filling the stator housing chamber 20 with the refrigerant. At this time, the deformation mode of the cylindrical partition member 17 is distributed load bending with both ends supported as shown in FIG.

As described above, according to the rotating electrical machine 10 of the present embodiment, since the partition wall that divides the stator housing chamber 20 and the rotor housing chamber 30 in a liquid-tight manner is composed of one partition member 17, the stator has a simple configuration. It is possible to prevent the refrigerant in the storage chamber 20 from leaking into the rotor storage chamber 30. Thereby, the mechanical loss by a refrigerant | coolant adhering to the rotor 12 can be reduced, and efficiency can be improved. Further, since there is no need to provide a discharge mechanism for discharging the refrigerant from the rotor housing chamber 30 to the outside, the rotating electrical machine 10 can be reduced in size.
Furthermore, since the partition which divides the stator storage chamber 20 and the rotor storage chamber 30 is comprised from the one partition member 17, intensity | strength can be ensured with respect to the pressure from the radial direction outer side by a refrigerant | coolant. Further, the abutting portion 177 formed on the rib 175 abuts on the circumferential end surface 111 b of the tooth 111, whereby the partition member 17 can be prevented from rotating with the rotation of the rotor 12.

  Further, according to the rotating electrical machine 10 of the present embodiment, since the ribs 175 are provided at all positions facing the slot 112, the strength can be further improved against the pressure from the outside in the radial direction. Thereby, the wall thickness of the partition member 17 can be reduced, the air gap S between the stator 11 and the rotor 12 can be reduced, and an increase in magnetic resistance due to the air gap S can be suppressed.

  Further, according to the rotating electrical machine 10 of the present embodiment, when refrigerant is supplied to the stator housing chamber 20, hydraulic pressure acts on the outer peripheral surface of the partition wall member 17 by the coolant, but the O-rings 18 and 18 are connected to the partition wall member 17. Since it abuts on the inner peripheral surface, the fluid pressure of the refrigerant acts in the direction of crushing the O-rings 18, 18, so that the sealing performance can be improved. Further, since the rib member 175 prevents the partition member 17 from being rotated along with the rotation of the rotor 12, it is possible to prevent the O-rings 18 and 18 from being damaged due to wear.

  Further, according to the rotating electric machine of the present embodiment, the partition member 17 is made of a resin material, and the ribs 175 are integrally formed by injection molding. Therefore, the partition member 17 provided with the ribs 175 can be easily manufactured. Can do.

Next, a pressure resistance test of the cylindrical partition member will be described with reference to FIGS.
As shown in FIG. 5, a cylindrical partition member Sa is prepared as a test sample, and four strain gauges (A to D, E to H) are attached at equal intervals in the circumferential direction on both sides in the axial direction of the partition member Sa. I attached. The test apparatus 40 includes a cylindrical member 43 having a cylindrical portion 41 having a diameter larger than that of the partition wall member Sa, protruding portions 42 protruding from the inner peripheral surface of the cylindrical portion 41 and provided at equal intervals in the circumferential direction, and provided at both axial ends. The shaft members 44 and 44 are opposed to each other, and are configured to be able to supply a refrigerant therein. Then, as shown in FIGS. 6A and 6B, the partition member Sa is attached to the test apparatus 40, and the outer peripheral surface of the partition member Sa is fitted into the protruding portion 42 corresponding to the teeth, and the partition member Sa. The inner peripheral surface of each was made fluid-tight by O-rings 45 and 45 and fixed to shaft members 44 and 44 at both axial ends. Thus, the partition member Sa was mounted on the test apparatus 40, the refrigerant was supplied to the space on the outer peripheral side of the partition member Sa, and the strain of the partition member Sa was examined.

FIG. 7 shows the result of the pressure resistance test.
As shown in FIG. 7, when the hydraulic pressure was not applied, a process of gradually deforming the partition wall member Sa having a substantially perfect circular cross section (see FIG. 7A) by increasing the hydraulic pressure was observed. In a state where the hydraulic pressure is relatively low, compressive stress is applied to all four strain gauges as shown in FIG. 7 (b), and as the hydraulic pressure is gradually raised, as shown in FIG. 7 (c). Tensile stress was applied at one location. Further, as shown in FIG. 7 (d), the partition member Sa was damaged from the tensile stress generating portion in FIG. 7 (c) by further increasing the hydraulic pressure.
From this pressure resistance test result, it was found that when an external pressure is applied to the partition wall member Sa, a tensile stress is generated at one location at a certain pressure, and the partition wall Sa is damaged from the tensile stress generation portion by further increasing the external pressure.
The same test was performed for the case where the outer peripheral surface of the partition wall member Sa was not fitted with the spigot portion 42, but it was confirmed that the partition wall member Sa was damaged at a lower pressure than when the spigot fitting was performed.

  Here, in the rotating electrical machine 10 of the present embodiment, a portion of the outer peripheral surface of the partition wall member 17 where the ribs 175 are not formed fits in the tooth tip surface 111a, so that a tensile stress is applied to a part of the partition wall member 17. The partition member 17 is supported by the tooth tip surface 111a even if it acts and is deformed to the outer diameter side. Therefore, even when the pressure in the stator housing chamber 20 is increased, deformation of the partition wall member 17 in the outer diameter direction can be uniformly suppressed, and refrigerant leakage to the rotor housing chamber 30 due to breakage or deformation of the partition wall member 17 can be avoided. Therefore, the cooling performance can be improved by increasing the refrigerant flow rate.

  Moreover, since the rib member 175 extending in the axial direction is provided on the outer peripheral surface of the partition wall member 17 at a position facing the slot 112 of the stator 11, the strength can be further improved against pressure from the outside in the radial direction. . As a result, even if the pressure in the stator housing chamber 20 increases, refrigerant leakage to the rotor housing chamber 30 due to breakage or deformation of the partition member 17 can be avoided, so that the coolant flow rate can be increased to further improve the cooling performance. Can do.

  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, in the above embodiment, the portion of the outer peripheral surface of the partition member 17 where the ribs are not formed is fitted into the tooth tip surface 111a by inlay fitting. There is no need to fit the surface 111a in-slot, and a predetermined gap may be provided between the outer peripheral surface of the partition wall member 17 and the tooth tip surface 111a. Thereby, it is not necessary to strictly manage the outer diameter of the partition member 17, and the manufacture of the partition member 17 can be facilitated.

  In the above embodiment, the ribs 175 extending in the axial direction are provided at all positions facing each slot. However, the present invention is not limited to this, and at least one rib 175 is provided to prevent the partition member 17 from being rotated. can do. In consideration of the strength and balance of the partition member 17, it is preferable to provide two or more ribs equally in the circumferential direction.

DESCRIPTION OF SYMBOLS 10 Rotating electrical machine 11 Stator 110 Stator core 111 Teeth 111a Teeth front end surface 111b Circumferential end surface 112 Slot 114 Coil 12 Rotor 13 Housing 131a Inlet 131b Outlet 133 Annular support 17 Partition member 175 Rib 177 Contact 18 O ring )
20 Stator accommodating chamber 30 Rotor accommodating chamber S Air gap

Claims (5)

A stator in which a coil is mounted on a stator core in which a plurality of slots and teeth are alternately formed on the inner peripheral surface, a rotor that is disposed on the inner peripheral side of the stator via an air gap, and is rotatable, and the stator and the rotor A rotating electrical machine comprising a housing for housing
The air gap is provided with a partition member that liquid-divides a stator accommodating chamber that accommodates the stator and a rotor accommodating chamber that accommodates the rotor,
The stator accommodating chamber is provided with an introduction port for introducing a refrigerant into the housing from the outside, and an outlet port for deriving the refrigerant from the inside of the housing to the outside.
The partition member is provided with at least one rib extending continuously along the axial direction at a position facing the slot on the outer peripheral surface;
The teeth have a circumferential end surface extending linearly from the bottom of the slot to the tooth tip surface when viewed from the axial direction,
The rib protrudes from the outer peripheral surface to a radially outer side than the tooth tip surface at a circumferential position between the adjacent teeth, and when viewed from the axial direction, the circumferential end surface of the tooth. Are formed in a substantially trapezoidal shape having both circumferential end surfaces facing each other.
Rotating electric machine characterized by that. The ribs are provided at all positions facing the slot.
The rotating electrical machine according to claim 1. The housing is provided with annular support portions for supporting the partition member on both sides in the axial direction of the partition member and on the inner diameter side,
An inner peripheral surface of the partition member is supported by the annular support portion via a seal member.
The rotating electrical machine according to claim 1 or 2, characterized in that The partition member is made of a resin material, and the rib is integrally formed by injection molding.
The rotating electric machine according to any one of claims 1 to 3, wherein the rotating electric machine is provided. Of the outer peripheral surface of the partition member, the portion where the rib is not formed is inlay-fitted to the tooth tip surface,
The rotating electric machine according to any one of claims 1 to 4, wherein the rotating electric machine is provided.

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