JP4476706B2 - motor - Google Patents

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, in Patent Document 1, a cooling pipe is directly attached to the outer periphery of a stator core (stator), and a coolant is supplied to the stator core via a coolant 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 a high output, which increases the cost burden and causes a problem 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 motor of the present invention includes a rotor (for example, the rotor 2 in the embodiment) and a stator (for example, a slot that is disposed on the outer peripheral side of the rotor and has an iron core and extends in the axial direction of the iron core. A stator 4) in the embodiment and a winding wound between the slots and having a pair of protrusions protruding from the slot to both sides in the axial direction (for example, the winding 5 in the embodiment) When covering the outside of the respective protruding portions in the axial direction of said core, said axial pair of shroud provided on both end faces (for example, the shroud 7 in the embodiment) and, by said each shroud the stator A pair of cooling chambers (for example, the cooling chambers 14a and 14b in the embodiment) formed by the enclosed space, and each shroud that introduces the refrigerant into each cooling chamber are provided. A pair of supply paths kicked (e.g., supply path 8a in the embodiment, 8b) and to discharge the refrigerant in which the introduced into the cooling chambers from the respective supply passage from each of said cooling chamber, each shroud A pair of discharge passages (for example, the discharge passages 9a and 9b in the embodiment), a common pump (for example, the pump 15 in the embodiment) for supplying the refrigerant to the supply passages, and the supply A pair of supply amount adjusting means (for example, the left end side adjustment valve 16 and the right end side adjustment valve 17 in the embodiment) that are provided in the passage or the discharge passage and adjust the supply amount of the refrigerant in each of the supply passages. And a pair of temperature measuring means (for example, temperature sensors 13a and 13b in the embodiment) for measuring the temperature associated with each of the protrusions. Of the refrigerant flowing through the pair of supply paths using only one of the supply amount adjusting means among the supply amount adjusting means so that the temperature difference between the temperatures measured from the stages is small. It is characterized by adjusting the flow rate.

According to the invention, the supplied refrigerant to the respective cooling chamber from the supply passage, the said each projection is cooled covered by the cooling chamber to flow to the shroud, the refrigerant from the respective discharge path It is discharged from each cooling chamber. Here, the refrigerant supplied from the supply passage formed in both end surfaces of the shroud, since it is discharged from the discharge passage provided in the supply path and the same end face side, without passing through the slot A refrigerant can be circulated from each supply path to each discharge path. Accordingly, there is no need to provide a high-pressure and large-sized pump, and each 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. . Moreover, according to this invention, it has a pair of supply amount adjustment means which adjusts the supply amount of a refrigerant | coolant, and a pair of temperature measurement means which each measures the temperature relevant to each protrusion part. Thus, when temperature unevenness occurs on both sides of each shroud due to a difference in the amount of heat generation or the presence of a heat source, the refrigerant supplied to each cooling chamber so that the temperature difference measured by each temperature measuring means becomes small. The amount of can be adjusted. In particular, according to the present invention, since the refrigerant is supplied to each supply path using a common pump, the refrigerant flowing through each supply path can be adjusted only by adjusting only one of the supply amount adjusting means. The flow rate can be adjusted. As a result, the temperature unevenness generated in each shroud can be quickly suppressed to make the motor temperature uniform.

Further, the motor of the present invention includes a shielding member (for example, the shielding members 21 and 22 in the embodiment) provided on at least one of the inner circumferential surface and the outer circumferential surface of the stator,
Each of the cooling chambers ( for example, the cooling chamber 24 in the embodiment ) is formed by a space surrounded by the shrouds, the stator, and the shielding member.

According to the invention, the supplied refrigerant to the respective cooling chamber from the supply passage, the said each projection is cooled covered by the cooling chamber to flow to the shroud, the refrigerant from the respective discharge path It is discharged from each cooling chamber. Here, the refrigerant supplied from the supply passage formed in both end surfaces of the shroud to be discharged from the discharge passage provided in the supply path and the same end face side, without passing through the slot A refrigerant can be circulated from each supply path to each discharge path. Accordingly, there is no need to provide a high-pressure and large-sized pump, and each 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. . Moreover, according to this invention, it has a pair of supply amount adjustment means which adjusts the supply amount of a refrigerant | coolant, and a pair of temperature measurement means which each measures the temperature relevant to each protrusion part. Thus, when temperature unevenness occurs on both sides of each shroud due to a difference in the amount of heat generation or the presence of a heat source, the refrigerant supplied to each cooling chamber so that the temperature difference measured by each temperature measuring means becomes small. The amount of can be adjusted. In particular, according to the present invention, since the refrigerant is supplied to each supply path using a common pump, the refrigerant flowing through each supply path can be adjusted only by adjusting only one of the supply amount adjusting means. The flow rate can be adjusted. As a result, the temperature unevenness generated in each shroud can be quickly suppressed to make the motor temperature uniform. In addition, since at least one of the inner peripheral surface and the outer peripheral surface of the stator can be connected by the shielding member, noise and vibration generated in each cooling chamber can be reduced.

The motor of the present invention is characterized in that each shroud includes a rib (for example, the rib 32 in the embodiment).
According to the present invention, the refrigerant supplied to said respective shroud from the supply passage, since the respective cooling chamber can be circulated while being guided by the ribs, the flow of the refrigerant flowing through the cooling chambers The flow can be rectified in a certain direction, and the cooling performance can be further enhanced. In addition, by reducing the vibration of each shroud by the ribs, it is possible to reduce the sound reverberation in each cooling chamber and to suppress noise.

According to the present invention, the supplied refrigerant to the respective cooling chamber from the supply passage, the said each projection is cooled covered by the cooling chamber to flow to the shroud, the refrigerant from the respective discharge path It is discharged from each cooling chamber. Here, the refrigerant supplied from the supply passage formed in both end surfaces of the shroud to be discharged from the discharge passage provided in the supply path and the same end face side, without passing through the slot A refrigerant can be circulated from each supply path to each discharge path. Accordingly, there is no need to provide a high-pressure and large-sized pump, and each 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. . Moreover, according to this invention, it has a pair of supply amount adjustment means which adjusts the supply amount of a refrigerant | coolant, and a pair of temperature measurement means which each measures the temperature relevant to each protrusion part. Thus, when temperature unevenness occurs on both sides of each shroud due to a difference in the amount of heat generation or the presence of a heat source, the refrigerant supplied to each cooling chamber so that the temperature difference measured by each temperature measuring means becomes small. The amount of can be adjusted. In particular, according to the present invention, since the refrigerant is supplied to each supply path using a common pump, the refrigerant flowing through each supply path can be adjusted only by adjusting only one of the supply amount adjusting means. The flow rate can be adjusted. As a result, the temperature unevenness generated in each shroud can be quickly suppressed to make the motor temperature uniform.

In addition, according to the present invention, it is possible to reduce the necessary space and improve the cooling performance while suppressing the cost, and it is possible to reduce noise and vibration generated in each cooling chamber. Furthermore, the flow of the refrigerant flowing through each cooling chamber can be rectified in a certain direction, and the cooling performance can be further enhanced. In addition, it is possible to reduce sound echoes in the respective cooling chambers and to suppress noise.

A motor according to an embodiment of the present invention will be described below 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 a refrigerant into the cooling chamber 14a is formed in the upper part of the shroud 7 on the left side 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, it is possible to cool the protrusion 6 by circulating the refrigerant in the respective cooling chambers 14a and 14b without passing through the slot.
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 flow paths 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. The temperature at both ends of the motor 1 is measured by these temperature sensors 13a and 13b.

  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 case, when temperature unevenness occurs on both sides of the shroud 7 due to a difference in heat generation amount or the presence of a heat source, one of the pair of adjusting valves 16 and 17 (in this case, the adjusting valve 16). It is possible to adjust the amount of refrigerant supplied to each of the supply passages 8a and 8b only by adjusting the degree of closing of () . Therefore, a large amount of refrigerant can be supplied through the supply path 8b formed on the end surface on the high temperature side of the shroud 7 (in this case, the right end surface), 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 treatment.

FIG. 8 is a sectional view of a motor in 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 has been described. 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 ... Protrusion 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 (3)

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 pair of protrusions protruding from the slots on both sides in the axial direction ;
A pair of shrouds that cover the outside of each protrusion in the axial direction of the iron core and are provided on both end faces in the axial direction ;
A pair of cooling chambers formed by a space surrounded by each shroud and the stator;
A pair of supply paths provided in each shroud for introducing a refrigerant into each cooling chamber;
Discharging the refrigerant said introduced into the cooling chambers from the respective supply passage from each of the respective cooling chamber, and a pair of discharge passages provided in the respective shroud,
A common pump for supplying the refrigerant to the supply paths;
A pair of supply amount adjusting means provided in the supply passage or the discharge passage, for adjusting the supply amount of the refrigerant in each of the supply passages;
A pair of temperature measuring means for measuring the temperature associated with each of the protrusions;
Have
Circulating the pair of supply paths using only one of the supply amount adjusting means among the supply amount adjusting means so that the temperature difference between the temperatures measured by the temperature measuring means is small. And adjusting the flow rate of the refrigerant . A shielding member provided on at least one of the inner peripheral surface and the outer peripheral surface of the stator;
2. The motor according to claim 1, wherein each of the cooling chambers is formed by a space surrounded by each of the shrouds, the stator, and the shielding member. The motor according to claim 1 or 2, characterized in that it comprises a rib on each shroud.

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