JP2006005984A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor which can raise its cooling performance by reducing a necessary space while reducing its cost. <P>SOLUTION: This motor is equipped with a rotor 2, a stator which is arranged around the rotor and has an iron core and where slots extending axially are formed, a winding 5 which is wound to the slots and has projections 6 projected from the slots, a guide 11 which covers the peripheral side of the projection 6, and a housing 10 which is arranged around the stator. An in-housing passage 14 is formed between a guide 11 and the housing 10. The guide 11 has a communication part 13 which connects the in-housing passage 14 with the interior of the housing 10, a supply path 8 which supplies a refrigerant into the housing 10, and a discharge path 16 which discharges the refrigerant from the inside of the guide. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a motor having a configuration in which a winding of a stator is cooled by a refrigerant.

  2. Description of the Related Art Conventionally, there has been proposed a motor that includes a rotor and a stator disposed on the outer peripheral side thereof, and has a configuration in which windings of the stator are cooled by a refrigerant. By cooling the winding with the refrigerant in this way, even if a current flows through the winding and generates heat, temperature rise due to heat generation is suppressed.

For example, Patent Document 1 proposes a technique for disposing an injection nozzle that injects oil, which is a coolant, onto a coil end of a stator housed in a housing.
Patent Document 2 proposes a technique for cooling a coil (winding) by circulating cooling oil from one end surface side of the stator to the other end surface side through a cooling passage formed by a slot. Yes.
Japanese Utility Model Publication No. 7-27270 JP 2001-145302 A

  However, the conventional techniques have the following problems. That is, in the case where the cooling pipe is attached to the outer periphery of the stator using the injection nozzle, a large pump or a large amount of oil is required to increase the pressure when spraying oil from the injection nozzle. There is a problem in practicality because the space is bulky and the cost is high. Further, it is difficult to evenly spray the oil sprayed from the spray nozzle over the entire surface of the winding, and there is a problem that temperature unevenness may occur in the winding.

  Also, in the case of a configuration in which the cooling oil is supplied through each slot, the pressure of the cooling oil drops when passing through the slot. Therefore, a high output is required to supply the cooling oil to the other end surface side of the stator. It is necessary to install a large pump, which increases the cost burden and is problematic in terms of practicality. Further, since the cooling oil is supplied through each slot, there is a problem that the cooling oil cannot be sufficiently supplied to the projecting portion of the winding that protrudes from each slot and is likely to store heat, and the cooling performance is deteriorated.

  Therefore, an object of the present invention is to provide a motor capable of reducing the necessary space and improving the cooling performance while suppressing the cost.

  The invention according to claim 1 is a stator (for example, the rotor 2 in the embodiment) and a stator that is disposed on the outer peripheral side of the rotor and has an iron core and forms a slot extending in the axial direction of the iron core ( For example, the stator 4) in the embodiment, the winding wound between the slots and having a protruding portion protruding from the slot (for example, the winding 5 in the embodiment), the protruding portion A guide (for example, guide 11 in the embodiment) covering the outer peripheral side and a housing (for example, housing 10 in the embodiment) disposed on the outer peripheral side of the stator are provided, and between the guide and the housing An in-housing flow path (for example, an in-housing flow path 14 in the embodiment) is formed, and the guide has a communication portion (for example, communicating between the in-housing flow path and the guide) For example, the communication hole 13 in the embodiment, the supply path for supplying the refrigerant to the inside of the housing (for example, the supply path 8 in the embodiment), and the discharge path for discharging the refrigerant from the inside of the guide (for example, in the embodiment) And a discharge port 16).

  According to the present invention, the refrigerant supplied from the housing can be supplied to the inside of the guide through the supply path, and the refrigerant flowing into the flow path in the housing can be supplied to the guide through the communication portion of the guide. It can be made to flow inside the guide. Accordingly, since the refrigerant can be concentratedly supplied to the projecting portion of the winding located in the guide, the projecting portion of the winding that is likely to store heat can be efficiently cooled, and the cooling performance of the motor can be improved. Can be improved. In addition, by forming the communication part in the part corresponding to the upper part or outer peripheral side of the projecting part of the winding, the refrigerant can be efficiently distributed to these parts, and the temperature of the projecting part can be reduced. Uniformity can be achieved. Thus, it is not necessary to provide a high-pressure and large-sized pump, and the protruding portion of the winding can be cooled with a small amount of refrigerant, so that the required space can be reduced and the cooling performance can be improved while suppressing the cost. it can.

The invention according to claim 2 is the invention according to claim 1, wherein a plurality of the communication portions are formed, and each communication portion (for example, the communication portions 23a to 23d in the embodiment) is close to the supply path. It is characterized by being formed so that the cross-sectional area becomes smaller.
According to the present invention, among the plurality of communicating portions, the one close to the supply path can ensure a flow rate that is fast and close to the supply pressure, so that a flow rate necessary for cooling can be ensured even if the cross-sectional area is small. it can. In addition, among the plurality of communication portions, those far from the supply path have a large cross-sectional area, so that even if the refrigerant flow rate and supply pressure are lower than the communication section close to the supply path, It is guided in the communication part, and a flow rate necessary for cooling can be secured. Therefore, the refrigerant can be distributed to the upper part and the outer part of the entire winding, and the cooling performance can be improved. Moreover, even if the supply pressure of the refrigerant is small, it can be supplied over the entire winding, and convenience can be improved.

The invention according to claim 3 is the one according to claim 1 or 2, wherein a plurality of the communication portions are formed, and each communication portion (for example, the communication holes 13a to 13e in the embodiment) It is characterized in that it is formed so that the distance between adjacent communication portions becomes larger as it is closer to the supply path.
According to the present invention, among the plurality of communication portions, the one close to the supply path has a high flow rate and can secure a pressure close to the supply pressure. Therefore, even if the interval between the adjacent communication portions is large, the cooling in the guide can be achieved. The necessary flow rate can be secured. Further, among the plurality of communication portions, those far from the supply path are set with a small interval between adjacent communication portions, so that the refrigerant flow rate and supply pressure are low compared to the communication portion close to the supply path, A flow rate necessary for cooling the coolant supplied from these portions into the guide can be secured. Therefore, the refrigerant can be distributed to the upper part and the outer part of the entire winding, and the cooling performance can be improved. Moreover, even if the supply pressure of the refrigerant is small, it can be supplied over the entire winding, and convenience can be improved.

The invention according to claim 4 is the invention according to any one of claims 1 to 3, characterized in that the in-housing flow path is formed at a position higher than the lowest part of the guide. To do.
According to this invention, the refrigerant can be stored in the communication portion and the end portion inside the flow path in the housing, and the refrigerant can be supplied from the open communication portion.

  The invention according to claim 5 is a rotor, a stator disposed on the outer peripheral side of the rotor, having a core and forming a slot extending in the axial direction of the core, and wound between the slots, A winding having a protrusion protruding from the slot, a rotation sensor for detecting a relative position in the rotation direction of the rotor and the stator, and a shield plate for preventing electrical noise from the winding (for example, an embodiment) A shield plate 32), a guide that covers the outer peripheral side of the protruding portion and is fixed together with the shield plate (for example, guide 34 in the embodiment), and a housing that is disposed on the outer peripheral side of the stator, An in-housing flow path is formed between the guide and the housing. The guide has a supply path for supplying a coolant to the inside of the housing, and a guide. Characterized in that it has a, a discharge passage for discharging the coolant from the side.

  According to the present invention, the refrigerant supplied from the housing can be supplied to the inside of the housing via the supply path, and the refrigerant that has flowed into the flow path in the housing can flow into the guide. it can. Accordingly, since the refrigerant can be concentratedly supplied to the projecting portion of the winding located in the guide, the projecting portion of the winding that is likely to store heat can be efficiently cooled, and the cooling performance of the motor can be improved. Can be improved. Thus, it is not necessary to provide a high-pressure and large-sized pump, and the protruding portion of the winding can be cooled with a small amount of refrigerant, so that the required space can be reduced and the cooling performance can be improved while suppressing the cost. it can.

The invention according to a sixth aspect is the one according to the fifth aspect, wherein the guide is provided with a communication portion that communicates the flow path in the housing with the inside of the guide.
According to the present invention, by forming the communication portion in a portion corresponding to the upper portion or outer peripheral side of the protruding portion of the winding, the refrigerant can be efficiently distributed to these portions, and the protrusion The temperature of the part can be made uniform.

The invention according to claim 7 is a rotor, a stator disposed on the outer peripheral side of the rotor, having a core and forming a slot extending in the axial direction of the core, and wound between the slots, A winding having a protrusion protruding from the slot, a rotation sensor for detecting a relative position in the rotation direction of the rotor and the stator, a guide that covers an outer peripheral side of the protrusion and is fixed together with the rotation sensor; A housing disposed on the outer peripheral side of the stator, and an in-housing flow path is formed between the guide and the housing, the supply path for supplying a coolant to the inside of the housing, and the guide inside And a discharge path for discharging the refrigerant from.
According to the present invention, the refrigerant supplied from the housing can be supplied to the inside of the housing via the supply path, and the refrigerant that has flowed into the flow path in the housing can flow into the guide. it can. Accordingly, since the refrigerant can be concentratedly supplied to the projecting portion of the winding located in the guide, the projecting portion of the winding that is likely to store heat can be efficiently cooled, and the cooling performance of the motor can be improved. Can be improved. Thus, it is not necessary to provide a high-pressure and large-sized pump, and the protruding portion of the winding can be cooled with a small amount of refrigerant, so that the required space can be reduced and the cooling performance can be improved while suppressing the cost. it can.

The invention according to an eighth aspect is the one according to the seventh aspect, characterized in that the guide is provided with a communication portion that communicates the flow path in the housing and the inside of the guide.
According to the present invention, by forming the communication portion in a portion corresponding to the upper portion or outer peripheral side of the protruding portion of the winding, the refrigerant can be efficiently distributed to these portions, and the protrusion The temperature of the part can be made uniform.

  According to the invention which concerns on Claim 1, the protrusion part of the said coil | winding which is easy to store heat can be cooled efficiently, and the cooling performance of a motor can be improved. Further, the temperature of the protrusion can be made uniform. And while suppressing cost, a required space can be reduced and cooling performance can be improved.

  According to the invention which concerns on Claim 2, Claim 3, a refrigerant | coolant can be spread over the upper part and an outer part among the said whole winding, and cooling performance can be improved. Moreover, even if the supply pressure of the refrigerant is small, it can be supplied over the entire winding, and convenience can be improved.

According to the invention which concerns on Claim 4, cooling performance can further be improved.
According to the invention which concerns on Claim 5, a required space can be reduced and cooling performance can be improved, suppressing cost. Furthermore, even if the guide is used, an increase in the number of parts required for fixing and an increase in space can be eliminated.
According to the invention which concerns on Claim 6, the temperature of the said protrusion part can be made uniform, and cooling performance can further be improved.
According to the invention of claim 7, it is possible to reduce the necessary space and improve the cooling performance while suppressing the cost.
According to the invention which concerns on Claim 8, the temperature of the said protrusion part can be equalize | homogenized and cooling performance can be improved further.

Hereinafter, a motor according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a sectional view showing a side surface of a motor according to a first embodiment of the present invention. FIG. 2 is an axial sectional view of the motor shown in FIG. As shown in these drawings, the motor 1 includes a rotor 2 provided on the inner circumferential side and a stator 4 disposed on the outer circumferential side. The rotor 2 has a rotor shaft 3 in an axial center portion, and is formed to be rotatable integrally with the rotor shaft 3.

  The stator 4 is made of an iron core in which electromagnetic steel plates having directionality such as silicon steel plates are laminated, and a plurality of magnetic pole teeth projecting inward in the radial direction of the motor 1 and a yoke extending in the circumferential direction of the motor 1. Part. Slots, which are grooves extending in the axial direction, are formed between the magnetic pole teeth of the stator 4, and windings (coils) 5 are wound between the slots. On both ends of the stator 4, guides 11 are provided so as to cover portions (projections) 6 projecting from the slots of the winding 5. The stator 4 and the rotor 2 are surrounded by a housing 10 disposed on the outer peripheral side thereof. The slot is not limited to the groove described above, and may be a through hole extending in the axial direction of the stator 4 or may be both the groove and the through hole.

  A housing supply path 8 that protrudes upward is formed in the upper part of the tip of the housing 10, and the refrigerant is supplied into the housing 10 through the supply path 8. A housing discharge path 9 protruding in the axial direction is formed in the lower part of the housing 10, and the refrigerant is discharged from the housing 10 through the discharge path 9.

  Between the guide 11 and the housing 10, an in-housing flow path 14 is formed in an annular cross section. The guide 11 has a supply port 15 at a position facing the supply path 8 of the housing 10 (in this case, the tip position of the guide 11), and the refrigerant supplied from the supply path 8 is supplied to the supply port 15 is supplied into the guide 11. Further, the guide 11 has a guide discharge port 16 at a position facing the discharge path 9 of the housing 10 (in this case, a lower position of the guide 11), and the guide 11 discharges the refrigerant in the guide 11. And discharged to the discharge path 9.

The guide 11 has a plurality of communication holes 13 communicating with the in-housing channel 14 and the guide 11 along the circumferential direction.
A plurality of the communication holes 13 (13a... 13e) are formed at symmetrical positions in the circumferential direction, and each communication hole 13 is formed so that the cross-sectional area becomes smaller as it is closer to the supply path 8.
That is, when the cross-sectional areas of the communication holes 13a... 13e are Sa... Se, Sa is the smallest cross-sectional area, and the cross-sectional areas increase in the order of Sb.

The contents of the cooling process of the motor 1 configured as described above will be described.
First, a refrigerant supplied from a refrigerant supply source (not shown) is supplied into the housing 10 through a supply path 8 of the housing 10. A part of the refrigerant flows into the guide 11 from the supply port 15 of the guide 11 formed so as to face the supply path 8, and cools the protruding portion 6 of the winding 5 in the guide 11. To do. Thereby, a refrigerant | coolant is supplied from the upper end part of the protrusion part 6 to the downward direction (refer route Ra, Rb of FIG. 1).

  On the other hand, a part of the refrigerant supplied from the supply path 8 of the housing 10 circulates toward the lower end side along the in-housing flow path 14 formed between the housing 10 and the guide 11. From the communication hole 13 thus made, it flows into the guide 11 sequentially (refer to the routes Rc, Rd... In FIG. 1). In this way, the refrigerant that has flowed into the in-housing channel 14 can be caused to flow into the guide 11 through the communication hole 13 of the guide 11.

  Accordingly, since the refrigerant can be intensively supplied to the protruding portion 5 of the winding 6 located in the guide 11, the protruding portion 6 of the winding 5 that is likely to store heat can be efficiently cooled, The cooling performance of the motor 1 can be improved.

  In addition, among the plurality of communication holes 13 (13a... 13e), the one close to the supply path 8 (for example, the communication hole 13a) has a high flow velocity and can secure a pressure close to the supply pressure. Even if Sa) is small, a flow rate required for cooling can be secured. Further, among the plurality of communication holes 13, those far from the supply path 8 (for example, the communication hole 13 e) have a large cross-sectional area (Se in this case), and therefore, compared with a communication part close to the supply path. Even if the flow rate and supply pressure of the refrigerant are low, the refrigerant is guided into the communication hole 13 by its own weight, and a flow rate necessary for cooling can be ensured.

  Therefore, the refrigerant can be distributed to the upper part and the outer part of the entire winding 5, and the cooling performance can be improved. Moreover, even if the supply pressure of the refrigerant is small, it can be supplied over the entire winding 5, and convenience can be improved.

  Therefore, there is no need to provide a high-pressure and large-sized pump, and the protruding portion of the winding can be cooled with a small amount of refrigerant. Therefore, the required space can be reduced and the cooling performance can be enhanced while suppressing the cost.

Hereinafter, a motor according to another embodiment of the present invention will be described. In the following description, the same components as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted as appropriate. FIG. 3 is a sectional view showing a side surface of the motor according to the second embodiment of the present invention.
In the present embodiment, the plurality of communication holes 23 (23a... 23d) formed in the guide 11 are formed such that the distance between the adjacent communication holes 23 increases as the distance from the guide supply path 8 increases. That is, as shown in the figure, the distances L1, L2, and L3 between the adjacent communication holes 23a and 23b, 23b and 23c, and 23c and 23d are the largest in L1, and are smaller in the order of L2 and L3.

  In this way, among the plurality of communication holes 23, the one close to the guide supply path 8 (for example, the communication hole 23a) can secure a pressure close to the supply pressure with a high flow velocity, so that the interval between the adjacent communication holes 23 is large. However, the flow rate required for cooling the guide 11 can be ensured.

  Further, among the plurality of communication holes 23, the distance between the adjacent communication holes 23 becomes smaller as the distance from the supply path 8 becomes smaller (for example, the distance L <b> 3). A flow rate required for cooling can be secured. Therefore, the refrigerant can be distributed to the upper part and the outer part of the entire winding 5, and the cooling performance can be improved. Moreover, even if the supply pressure of the refrigerant is small, it can be supplied over the entire winding 5, and convenience can be improved.

FIG. 4 is an axial cross-sectional view of a motor in the third embodiment of the present invention. FIG. 5 is a perspective view of the shield plate shown in FIG. FIG. 6 is a perspective view of the guide shown in FIG. FIG. 7 is a perspective view of a shield plate on which the guide shown in FIG. 4 is mounted.
As shown in these drawings, in the present embodiment, the shield plate 32 that prevents magnetic noise from the magnet of the rotor 2 and the outer peripheral side of the protruding portion are covered and fixed to the shield plate 32. A guide 34 and a housing 10 disposed on the outer peripheral side of the stator 4 are provided. The shield plate 32 is formed in an L-shaped cross section, and the rotation sensor 31 of the motor 30 is mounted on the side end surface thereof. In the present embodiment, the number of parts is reduced by bringing the guide 34 into contact with the outer peripheral surface side of the shield plate 32.

That is, as shown in FIG. 5 to FIG. 7, the shield plate 32 has a shape that protrudes in the axial direction on the outer peripheral side of the ring-shaped main body, and the protruding portion has a notch for positioning. 33 is formed.
On the other hand, the guide 34 is formed so that the shaft center portion is hollow, and connects the outer peripheral side cylindrical portion and the inner peripheral side cylindrical portion that hold the protruding portion 6 of the winding 5 on the outer peripheral side and the inner peripheral side. And an annular connecting portion. A positioning projection 35 is formed on the inner peripheral cylindrical portion.
Then, as shown in FIG. 7, the guide 34 is attached to the shield plate 32 by engaging the notch 33 and the protrusion 35, so that the guide 34 is centered on the shield plate 32. It can fix so that it may not move to the rotation direction with respect to. Further, by holding the guide 34 between the housing 10 and the shield plate 32, it can be fixed so as not to move in the axial direction and the direction perpendicular to the axial direction. By doing in this way, even if it uses the said guide 34, the increase in the number of parts required for fixation and the increase in space can be eliminated, and a weight and cost can be reduced.

  Of course, the contents of the present invention are not limited to the above-described embodiments. For example, in the embodiment, the shield plate 32 is formed in an L-shaped cross section, but is not limited to this shape. Further, the protruding direction on the outer peripheral side of the shield plate 32 may be the tip direction of the motor.

It is sectional drawing which shows the side surface of the motor in the 1st Embodiment of this invention. It is an axial sectional view of the motor shown in FIG. It is sectional drawing which shows the side surface of the motor in the 2nd Embodiment of this invention. It is an axial sectional view of the motor in the 3rd embodiment of the present invention. It is a perspective view of the shield plate shown in FIG. It is a perspective view of the guide shown in FIG. It is a perspective view of the shield plate which mounted | wore with the guide shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 20, 30 ... Motor 2 ... Rotor 4 ... Stator 5 ... Winding 6 ... Projection part 8 ... Supply path 10 ... Housing 11, 34 ... Guide 13 (13a ... 13e), 23 (23a ... 23d) ... Communication hole ( Communication part)
14 ... In-housing flow path 15 ... Supply port (communication part)
16 ... discharge port (discharge channel)
32 ... Shield plate

Claims (8)

A rotor,
A stator which is disposed on the outer peripheral side of the rotor and has a core and forms a slot extending in the axial direction of the core;
A winding wound between the slots and having a protrusion protruding from the slot;
A guide covering the outer peripheral side of the protruding portion;
A housing disposed on the outer peripheral side of the stator,
A flow path in the housing is formed between the guide and the housing,
The guide has a flow path in the housing and a communication portion communicating with the inside of the guide, a supply path for supplying the refrigerant to the inside of the housing, and a discharge path for discharging the refrigerant from the inside of the guide. Motor. A plurality of the communication portions are formed,
2. The motor according to claim 1, wherein each communication portion is formed so that a cross-sectional area becomes smaller as it is closer to the supply path. A plurality of the communication portions are formed,
3. The motor according to claim 1, wherein each communication portion is formed so that a distance between adjacent communication portions increases as a distance from the supply path increases.   The motor according to any one of claims 1 to 3, wherein the in-housing flow path is formed at a position higher than a lowermost part of the guide. A rotor,
A stator which is disposed on the outer peripheral side of the rotor and has a core and forms a slot extending in the axial direction of the core;
A winding wound between the slots and having a protrusion protruding from the slot;
A rotation sensor for detecting a relative position in the rotation direction of the rotor and the stator;
A shield plate for preventing electrical noise from the winding;
A guide that covers the outer peripheral side of the protrusion and is fixed together with the shield plate;
A housing disposed on the outer peripheral side of the stator,
A flow path in the housing is formed between the guide and the housing,
The motor according to claim 1, wherein the guide has a supply path for supplying a refrigerant to the inside of the housing and a discharge path for discharging the refrigerant from the inside of the guide.   The motor according to claim 5, wherein the guide includes a communication portion that communicates between the flow path in the housing and the inside of the guide. A rotor,
A stator that is disposed on the outer peripheral side of the rotor and has a core and forms a slot extending in the axial direction of the core;
A winding wound between the slots and having a protrusion protruding from the slot;
A rotation sensor for detecting a relative position in the rotation direction of the rotor and the stator;
A guide that covers an outer peripheral side of the protrusion and is fixed together with the rotation sensor;
A housing disposed on the outer peripheral side of the stator,
A flow path in the housing is formed between the guide and the housing,
The motor according to claim 1, wherein the guide has a supply path for supplying a refrigerant to the inside of the housing and a discharge path for discharging the refrigerant from the inside of the guide. The motor according to claim 7, wherein the guide includes a communication portion that communicates between the flow path in the housing and the inside of the guide.

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