JP2005354822A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor which can coolability by reducing necessary space while suppressing the cost. <P>SOLUTION: This motor is equipped with a rotor 2, a stator 4 which has an iron core and where a slot extending in the axial direction of the iron core is made, winding 5 which is wound between the above slots and has a projection 6 projected from the above slot, and a shroud 7 which covers the outside of the above projection 6. This motor has a cooling chamber 14 which is made by the space surrounded by the above shroud 7 and the above stator 4, a supply path 8 which leads a refrigerant into the above cooling chamber 14, and a discharge path 9 which discharges the refrigerant led in through the above supply path 8 from the cooling chamber 14, being provided on the side of the same one face as this. The above supply path 8 and the above discharge path 9 are made severally at both end faces of the above shroud 7. <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 a winding of the stator is 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, an increase in temperature due to heat generation is suppressed.
For example, in Patent Document 1, a cooling pipe is directly attached to an outer peripheral portion of a stator core (stator), and a cooling liquid is supplied to the stator core via a cooling liquid passage formed in the cooling pipe. Motors have been proposed that can cool the wires.

Further, Patent Document 2 includes an annular coil end chamber that is hermetically sealed on both sides in the axial direction of the stator, and a cooling oil supply port that is a coolant so as to communicate with the coil end chamber; A motor in which a discharge port is formed has been proposed. According to this, the cooling oil pumped to the supply port by the oil pump passes through each slot in the stator as a cooling passage and is discharged from the discharge port, thereby forcibly cooling the stator core and the coil.
Japanese Patent Laid-Open No. 9-93869 JP 2003-224945 A

  However, the conventional techniques have the following problems. That is, in the case of a configuration in which the cooling pipe is attached to the outer peripheral portion of the stator, it is necessary to secure a space for providing the cooling pipe outside the stator. There is a problem of becoming. In addition, since the cooling liquid is supplied through the cooling pipe, the distance from the heat generating winding increases, and there is a problem that the cooling cannot be effectively performed.

  Further, in the case of a configuration in which cooling oil is supplied through each slot, the winding of the winding is set in the slot, so that the pressure of the cooling oil drops when passing between the windings in the slot. In order to supply the cooling oil to the discharge port, it is necessary to install a large pump with high output, which increases the cost burden and has a problem in 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 protruding from the slot (for example, the winding 5 in the embodiment), and the shaft of the iron core A cooling chamber (for example, in the embodiment) formed by a space surrounded by at least the shroud and the stator, the shroud (eg, the shroud 7 in the embodiment) covering the outside of the protruding portion in the direction The cooling chamber 14), a supply path for introducing the refrigerant into the cooling chamber (for example, the supply path 8 in the embodiment), and the axial direction of the iron core A discharge path that is provided on the same end face side as the supply path and discharges the refrigerant introduced from the supply path from the cooling chamber (for example, the discharge path 9 in the embodiment), and the supply path and the discharge path Is formed on at least one of the shrouds.

  According to the present invention, the refrigerant is supplied from the supply path to the cooling chamber, cools the protruding portion that flows through the cooling chamber and is covered with the shroud, and the refrigerant is discharged from the cooling chamber from the discharge path. . Here, since the refrigerant supplied from the supply passages formed on the both end faces of the shroud is discharged from the discharge passage provided on the same end face side as each supply passage, the supply without passing through the slot. The refrigerant can be circulated from the passage to the discharge passage. Accordingly, there is no need to provide a high-pressure and large-sized pump, and the projecting 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 enhanced while suppressing the cost.

The invention according to claim 2 is the invention according to claim 1, wherein the shroud is provided on both axial end surfaces of the iron core, and the shroud provided on the both end surfaces includes the supply path and the shroud. Each of the discharge paths is formed, and has supply amount adjusting means (for example, the left end side adjustment valve 16 and the right end side adjustment valve 17 in the embodiment) for independently adjusting the supply amount of each refrigerant in the supply path. It is characterized by that.
According to this invention, when temperature unevenness occurs on both sides of the shroud due to a difference in heat generation amount or the presence of a heat source, the supply amount of each refrigerant in the supply path is independently adjusted by the supply amount adjusting means. By doing so, a large amount of refrigerant can be supplied through the supply path formed on the end surface on the high temperature side of the shroud, and temperature unevenness generated in the shroud can be quickly suppressed.

  According to a third aspect of the present invention, a rotor, a stator that is disposed on the outer peripheral side of the rotor, has an iron core and forms a slot extending in the axial direction of the iron core, and is wound between the slots, A winding having a protrusion protruding from the slot, a shroud covering the outside of the protrusion in the axial direction of the iron core (for example, the shroud 31 in the embodiment), an inner peripheral surface of the stator or A shielding member (for example, shielding members 21 and 22 in the embodiment) provided on at least one of the outer peripheral surfaces, and is formed by a space surrounded by the shroud, the stator, and the shielding member. A cooling chamber (for example, the cooling chamber 24 in the embodiment), a supply path for introducing the refrigerant into the cooling chamber, and the same end as the supply path in the axial direction of the iron core And a discharge path for discharging the refrigerant introduced from the supply path from the cooling chamber, and the supply path and the discharge path are respectively provided with the shroud on both end surfaces in the axial direction of the iron core. It is formed.

  According to the present invention, the refrigerant is supplied from the supply path to the cooling chamber, cools the protruding portion that flows through the cooling chamber and is covered with the shroud, and the refrigerant is discharged from the cooling chamber from the discharge path. . Here, since the refrigerant supplied from the supply passages formed on the both end faces of the shroud is discharged from the discharge passage provided on the same end face side as each supply passage, the supply without passing through the slot. The refrigerant can be circulated from the passage to the discharge passage. Accordingly, 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, and the required space can be reduced and the cooling performance can be enhanced while suppressing the cost. In addition, since at least one of the inner peripheral surface or the outer peripheral surface of the stator can be connected by the shielding member, noise and vibration generated in the cooling chamber can be reduced.

The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the shroud includes a rib (for example, the rib 32 in the embodiment).
According to this invention, the refrigerant supplied from the supply path into the shroud can flow while being guided by the ribs in the cooling chamber, so the flow of the refrigerant flowing through the cooling chamber is rectified in a certain direction. Therefore, the cooling performance can be further enhanced. In addition, by reducing the vibration of the shroud by the rib, it is possible to reduce the echo of the sound in the cooling chamber and to suppress the noise.

According to the first aspect of the present invention, 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. Cooling performance can be enhanced.
According to the invention which concerns on Claim 2, the temperature nonuniformity which arose in the said shroud can be suppressed rapidly.

According to the third aspect of the present invention, the required space can be reduced and the cooling performance can be improved while suppressing the cost, and the noise and vibration generated in the cooling chamber can be reduced.
According to the invention which concerns on Claim 4, the flow of the refrigerant | coolant which distribute | circulates a cooling chamber can be rectified in a fixed direction, and it becomes possible to further improve cooling performance. In addition, sound echoes in the cooling chamber can be reduced, and noise can be suppressed.

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 of a motor according to a first embodiment of the present invention. As shown in FIG. 1, the motor 1 includes a rotor 2 provided on the inner peripheral side and a stator 4 disposed on the outer peripheral 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 teeth that protrude inward in the radial direction of the motor 1 and a yoke that extends in the circumferential direction of the motor 1. Part. Slots which are grooves or communication holes extending in the axial direction are formed between the magnetic teeth of the stator 4, and windings (coils) 5 are wound between the slots. On both ends of the stator 4, shrouds 7 are provided so as to cover the protruding portions 6 that are portions protruding from the slots of the winding 5. A cooling chamber 14 (14 a, 14 b) is formed by a space surrounded by the shroud 7, the stator 4, and the housing 10.

FIG. 2 is a side view of the shroud shown in FIG. As shown in FIGS. 1 and 2, a supply path 8a for introducing the refrigerant into the cooling chamber 14a is formed in the upper portion of the left shroud 7 in the drawing. In addition, a discharge path 9a for discharging the refrigerant from the cooling chamber 14a is formed in the lower part. Similarly, a supply path 8b for introducing the refrigerant into the cooling chamber 14b and a discharge path 9b for discharging the refrigerant from the cooling chamber 14b are also formed in the upper right side and the lower right side of the shroud 7. That is, cooling chambers 14a and 14b are formed at both ends of the shroud 4, respectively. The cooling chamber 14a is connected to the supply path 8a and the discharge path 9a, and the cooling chamber 14b is discharged from the supply path 8b and the discharge path 9b.
The rotor 2 and the stator 4 are surrounded by a housing 10 formed in a substantially cylindrical shape.

  The cooling process of the motor 1 configured as described above will be described. First, the refrigerant is supplied to the cooling chambers 14a and 14b from supply paths 8a and 8b formed in the shroud 7 formed on both end surfaces of the iron core. The refrigerant supplied to the respective cooling chambers 14 a and 14 b circulates in the cooling chambers 14 a and 14 b while cooling the protrusion 6 covered with the shroud 7.

Since the respective cooling chambers 14a and 14b are respectively connected to supply paths 8a and 8b and discharge paths 9a and 9b provided on the same end face side, the refrigerant supplied from the supply paths 8a and 8b to the cooling chambers 14a and 14b. Are discharged from discharge paths 9a and 9b provided on the same end face side as the respective supply paths 8a and 8b. As a result, the protrusion 6 can be cooled by allowing the coolant to flow through the cooling chambers 14a and 14b without passing through the slots.
Therefore, the motor 1 according to the present embodiment does not need to be provided with a high-pressure and large-sized pump and can cool the protruding portion 6 of the winding 5 with a small amount of refrigerant. The cooling performance can be increased by reducing the temperature.

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 of a motor according to the second embodiment of the present invention. FIG. 4 is an overall configuration diagram showing a motor cooling system according to the second embodiment of the present invention. As shown in FIG. 4, a left end supply flow path 18 is connected to the supply path 8 a on the left end side of the motor 1, and a right end supply flow path 19 is connected to the supply path 8 b on the right end side.

  The left end side supply flow path 18 and the right end side supply flow path 19 are respectively provided with a left end side adjustment valve 16 and a right end side adjustment valve 17, and the supply flow path is adjusted by adjusting the degree of closure of these valves 16, 17. The flow rate of the refrigerant flowing through 18 and 19 can be adjusted. The supply channels 18 and 19 are connected to the pump 15 on the upstream side of the valves 16 and 17, and the pump 15 pumps the refrigerant to the supply channels 18 and 19.

  Further, discharge passages 23a and 23b are connected to the discharge path 9a on the left end side and the discharge path 9b on the right end side of the motor 1, respectively. Temperature sensors 13a and 13b are provided in the discharge channels 23a and 23b in the vicinity of the respective discharge channels 9a and 9b. These temperature sensors 13a and 13b measure the temperatures at both ends of the motor 1.

  The discharge flow paths 23a and 23b are joined together on the downstream side. And the radiator 12 is arrange | positioned in the discharge flow path 23 which joined, and when passing through the radiator 12, a refrigerant | coolant is further cooled. On the downstream side of the radiator 12, the discharge passage 23 is connected to the pump 15, and the refrigerant cooled by the radiator 12 can be supplied to the motor 1 again by the pump 15.

  As shown in FIGS. 3 and 4, a heat source 11 such as an engine or a fuel cell is disposed on the right end side of the motor 1. In such a case, under the influence of the heat source 11, the right end portion side of the motor 1 becomes hotter than the left end portion side. In the present embodiment, the temperature of the motor 1 is made uniform by adjusting the flow rate of the refrigerant in the supply flow paths 18 and 19 connected to the respective ends of the motor 1 and the degree of closing of the valves 16 and 17. I try to plan.

  FIG. 5 is a graph showing the relationship between the closing degree of the regulating valve and the temperature difference between the supply paths at both ends. As shown in the figure, the origin is the state where the valves 16 and 17 are fully opened. The upper part of the vertical axis shows the closing degree (tightening degree) of the adjustment valve 16 on the left end side, and the lower part of the vertical axis shows the closing degree (tightening degree) of the adjustment valve 17 on the right end side. Moreover, the horizontal axis has shown the difference of the temperature detected by each temperature sensor 13a, 13b. In the present embodiment, the difference is calculated from the temperatures detected by the temperature sensors 13a and 13b, and the closeness of the adjustment valves 16 and 17 is adjusted based on the difference based on the graph shown in FIG.

  For example, as shown in FIGS. 3 and 4, when the heat source 11 is disposed on the right end side and the temperature on the right end side of the motor 1 is higher than the temperature on the left end side, the adjustment valve 16 on the left end side The closing degree is set to a predetermined value obtained based on FIG. In other words, by restricting the flow rate of the refrigerant supplied from the left end side supply flow path 18, the flow rate of the refrigerant supplied from the right end side supply flow path 19 is increased, and the cooling performance on the right end side is increased.

  In this way, when temperature unevenness occurs on both sides of the shroud 7 due to a difference in the amount of heat generation or the presence of a heat source, the supply amounts of the refrigerant in the supply passages 8a and 8b are made independent by the adjusting valves 16 and 17, respectively. Can be adjusted. Therefore, a large amount of refrigerant can be supplied through the supply path 8b formed on the high-temperature end surface (in this case, the right-side end surface) of the shroud 7, and temperature unevenness generated in the shroud 7 can be quickly suppressed.

  FIG. 6 is a sectional view of a motor according to the third embodiment of the present invention. FIG. 7 is a side view of the shroud shown in FIG. As shown in these drawings, the motor 20 in the present embodiment includes shielding members 21 and 22 provided so as to cover the inner peripheral surface and the outer peripheral surface of the stator 4. The cooling chambers 24 a and 24 b are formed on the respective end surfaces of the motor 20 by the space surrounded by the shroud 7, the stator 4, and the shielding members 21 and 22.

In this way, in addition to the operational effects of the above-described embodiment, the inner peripheral surface or the outer peripheral surface of the stator 4 can be connected by the shielding members 21 and 22, so that noise and vibration generated in the cooling chamber 24 can be reduced. Can be reduced.
Further, by covering the winding 5 and the like with the shielding members 21 and 22, the necessity of performing the winding fixing step (varnish) or the like can be eliminated, and the manufacturing process can be simplified.
Furthermore, since the vibration of the stator 4 which is a sound transmission source of the motor 20 can be reduced, the noise of the motor 20 can be reduced.

  In addition, it is preferable to join the shielding members 21 and 22 and the shroud 7 by ultrasonic welding because the moldability is good and burrs can be reduced by the output at the time of welding. Further, the shielding members 21 and 22 can be preferably made of polyacetal resin, polyamide resin, PPS (polyphenylene sulfide) resin, aluminum, or SUS. Further, the winding 5 in the present embodiment is coated with a polyimide resin or the like and subjected to an insulation process.

FIG. 8 is a sectional view of a motor according to the fourth embodiment of the present invention. FIG. 9 is a side view of the shroud shown in FIG. As shown in FIG. 9, the motor 30 in the present embodiment includes a rib 32 on a shroud 31.
In this way, the refrigerant supplied into the shroud 31 from the supply path 8a can be circulated through the cooling chamber 24 while being guided by the ribs 32. Therefore, the refrigerant flowing through the cooling chamber 24 is allowed to flow. The flow can be rectified in a certain direction, and the cooling performance can be further enhanced.

In addition, by reducing the vibration of the shroud 31, it is possible to reduce the echo of the sound in the cooling chamber 24 and to suppress the noise.
Further, as shown in FIG. 9, the rib 32 may be formed in an annular shape in the circumferential direction so as to protrude substantially uniformly in the axial direction, but is not limited to this shape. Absent. For example, as shown in FIG. 10, ribs 33 formed in an arc shape may be formed at respective positions on the inner peripheral side and the outer peripheral side.

  Of course, the contents of the present invention are not limited to the above-described embodiments. For example, in the embodiment, the case where the shielding members 21 and 22 are provided on each of the inner peripheral surface and the outer peripheral surface of the stator 4 is described. In addition, the cooling chamber 14 is formed by a space surrounded by the shroud 7, the stator 4, and the housing 10, but is not limited thereto, and may be a space surrounded by the shroud 7 and the stator 4.

It is sectional drawing of the motor in the 1st Embodiment of this invention. It is a side view of the shroud shown in FIG. It is sectional drawing of the motor in the 2nd Embodiment of this invention. It is a whole block diagram which shows the cooling system of the motor in the 2nd Embodiment of this invention. It is a graph which shows the relationship between the closing degree of an adjustment valve, and the temperature difference in the supply path of both ends. It is sectional drawing of the motor in the 3rd Embodiment of this invention. FIG. 7 is a side view of the shroud shown in FIG. 6. It is sectional drawing of the motor in the 4th Embodiment of this invention. It is a side view of the shroud shown in FIG. FIG. 9 is a side view of another shroud shown in FIG. 8.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 20, 30 ... Motor 2 ... Rotor 4 ... Stator 5 ... Winding 6 ... Projection 7, 31 ... Shroud 8 (8a, 8b) ... Supply path 9 (9a, 9b) ... Discharge path 14 (14a, 14b) 24 (24a, 24b) ... cooling chamber 16 ... left end side adjustment valve (supply amount adjusting means)
17 ... Right end side adjustment valve (supply amount adjusting means)
21 ... Shield member 22 ... Shield member 32 ... Rib

Claims (4)

The 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 shroud covering the outside of the protrusion in the axial direction of the iron core,
A cooling chamber formed by a space surrounded by at least the shroud and the stator;
A supply path for introducing a refrigerant into the cooling chamber;
A discharge path that is provided on the same end surface side as the supply path in the axial direction of the iron core and discharges the refrigerant introduced from the supply path from the cooling chamber;
The motor characterized in that the supply path and the discharge path are respectively formed in at least one of the shrouds. The shroud is provided on both axial end surfaces of the iron core,
In the shroud provided on the both end faces, the supply path and the discharge path are respectively formed,
The motor according to claim 1, further comprising a supply amount adjusting unit that independently adjusts the supply amount of each refrigerant in the supply path. 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 shroud covering the outside of the protrusion in the axial direction of the iron core;
A shielding member provided on at least one of the inner peripheral surface and the outer peripheral surface of the stator;
With
A cooling chamber formed by a space surrounded by the shroud, the stator, and the shielding member;
A supply path for introducing a refrigerant into the cooling chamber;
A discharge path that is provided on the same end surface side as the supply path in the axial direction of the iron core and discharges the refrigerant introduced from the supply path from the cooling chamber;
The motor, wherein the supply path and the discharge path are each formed with the shroud on both end surfaces in the axial direction of the iron core. The motor according to any one of claims 1 to 3, wherein the shroud includes a rib.

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