JP7503738B2 - motor - Google Patents

Description

The present invention relates to a motor, and in particular to a motor equipped with a structure for cooling the rotor.

As an example of the above motor, as disclosed in Patent Document 1, a rotating electric machine is known that includes a cylindrical stator having a coil, a rotor having magnets and rotatably arranged at a distance radially inward from the stator (inner in the radial direction of the stator), and a shaft that serves as the rotation axis of the rotor.

The rotating electric machine is provided with a structure for cooling the rotor. More specifically, the structure for cooling the rotor in the rotating electric machine is composed of an axial coolant passage formed to penetrate the shaft from one end to the other end in the axial direction, a radial coolant passage that communicates with the axial coolant passage and opens on the outer circumferential surface of the shaft, and a coolant supply pipe for circulating the coolant supplied to the axial coolant passage.

When the rotating electric machine is used, when refrigerant is supplied to the refrigerant supply pipe, the refrigerant passes through the axial refrigerant passage and the radial refrigerant passage and flows into the space between the shaft and the rotor, allowing the rotor to be cooled from the inner peripheral surface side.

JP 2020-114151 A

However, in the conventional rotating electric machine, the refrigerant that flows into the space between the shaft and the rotor through the radial refrigerant passage flows toward the inner circumferential surface of the rotor and spreads in the axial direction, and may be discharged before sufficient heat exchange with the rotor occurs, particularly on the inner circumferential surface of the rotor. As a result, the rotating electric machine has a problem of reduced rotor cooling performance.

In view of this situation, the present invention aims to provide a motor with high cooling performance.

The motor of the present invention comprises:
A stator;
a rotor disposed within the stator;
The rotor is
a rotor core portion having a cylindrical shape and arranged such that an outer peripheral surface of the rotor core faces an inner peripheral surface of the stator;
a core portion support member that rotatably supports the rotor core portion relative to the stator;
a cooling unit that cools the rotor core unit,
The cooling unit includes:
a cylindrical base portion that is cylindrical and that is disposed radially inwardly and spaced apart from an inner circumferential surface of the rotor core portion;
a nozzle portion formed to extend from an outer circumferential surface of the cylindrical base portion toward an inner circumferential surface of the rotor core portion and to communicate an inside and an outside of the cylindrical base portion,
The core portion support member is
a refrigerant supply port for passing a refrigerant to be supplied into the cylindrical base portion;
A coolant discharge port is provided for discharging the coolant from between the rotor core portion and the cylindrical base portion.

The motor of the above configuration is configured so that the refrigerant is sent from the nozzle portion protruding from the outer peripheral surface of the cylindrical base portion toward the inner peripheral surface of the rotor core portion. This makes it easier for the area on the rotor core portion side in the space between the cylindrical base portion and the rotor core portion to be filled with fresh refrigerant before heat exchange, thereby improving the cooling performance of the rotor core portion.

In addition, in the motor of the present invention,
The cooling unit includes:
The rotor core may be configured to have heat dissipation fins that protrude directly or indirectly from an inner circumferential surface of the rotor core.

With a motor configured as described above, the heat of the rotor core is transferred to the fins, allowing the heat to escape to the fins and allowing the heat generated in the rotor core to be exchanged between the refrigerant and the inner circumferential surface of the rotor core and the fins, further improving the cooling performance of the rotor core.

The motor of the present invention further comprises:
A coolant supplying means may be provided for supplying a coolant to the coolant supply port.

With a motor of the above configuration, the refrigerant supply means can continue to forcibly supply refrigerant to the refrigerant supply port, so that the refrigerant can be steadily sent to the inner circumferential surface of the rotor core, thereby stabilizing the cooling performance of the rotor core.

Furthermore, the motor of the present invention has
a nozzle forming member including a plate-shaped portion formed of a soft material in a flat plate shape and having a plurality of through holes formed therein, and a plurality of tubular portions constituting the nozzle portion, the tubular portions being integrally provided upright on the plate-shaped portion such that the interiors of the tubular portions communicate with the through holes;
The cylindrical base portion is formed with a plurality of through holes extending radially therethrough,
The plate-like portion may be attached by stacking it on the inner or outer peripheral surface of the cylindrical base portion, with each of the multiple cylindrical portions being positioned in accordance with the position of the through hole in the cylindrical base portion.

In a motor with the above configuration, multiple nozzles can be formed at once by stacking and attaching the plate-shaped portion of the nozzle forming member to the inner or outer peripheral surface of the cylindrical base portion.

In this way, the motor of the above configuration uses a nozzle forming member in which multiple nozzle portions are integrally erected on a plate-shaped portion, thereby reducing the effort required to provide multiple nozzle portions on a cylindrical base portion, making it easier to manufacture a motor with improved cooling performance.

As described above, the motor of the present invention has the excellent effect of providing high cooling performance.

FIG. 1 is a perspective view of a motor according to an embodiment of the present invention. FIG. 2 is a perspective view of the motor according to the embodiment. FIG. 3 is a view of the motor according to the embodiment as viewed from one of the rotation support parts. FIG. 4 is an exploded perspective view of the rotor in the motor according to the embodiment. FIG. 5 is a cross-sectional view taken along line VV in FIG. FIG. 6 is a vertical cross-sectional view of FIG. FIG. 7 is an enlarged view of region VII in FIG. FIG. 8 is a view of the nozzle forming member of the motor according to the embodiment as viewed from the front side. FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. 10A and 10B are explanatory diagrams of a method for forming a nozzle portion of a motor according to the embodiment, in which (a) is an explanatory diagram of a state in which a nozzle forming member is placed on a cylindrical cover portion, and (b) is an explanatory diagram of a state after the nozzle forming member has been fixed to the cylindrical cover portion. FIG. 11 is an enlarged cross-sectional view of region XI in FIG. 12A and 12B are explanatory diagrams showing the arrangement positions of the fins and the nozzle portion. FIG. 13 is an explanatory diagram of the flow of the coolant from the coolant supply port to the coolant discharge port in the motor according to the embodiment. FIG. 14 is an explanatory diagram of the flow of coolant in the motor according to the same embodiment, illustrating the flow of coolant from inside the cylindrical base portion through the nozzle portion toward the space between the cylindrical base portion and the core portion. In Figure 15, (a) is an explanatory diagram of an example of the arrangement of the fins and the nozzle portion, (b) is an explanatory diagram of another example of the arrangement of the fins and the nozzle portion, and (c) is an explanatory diagram of yet another example of the arrangement of the fins and the nozzle portion. In Figure 16, (a) is an explanatory diagram of a method of forming a nozzle portion of a motor according to another embodiment of the present invention, and (b) is an explanatory diagram of a method of forming a nozzle portion of a motor according to another embodiment of the present invention. 17A and 17B are explanatory diagrams of a method of forming a nozzle portion using the nozzle-forming member shown in FIG. 16A, where (a) is an explanatory diagram of a state in which the nozzle-forming member is placed on the cylindrical cover portion, and (b) is an explanatory diagram of a state after the nozzle-forming member is fixed to the cylindrical cover portion. FIG. 18 is an enlarged cross-sectional view of region XVIII in FIG.

The motor according to one embodiment of the present invention will be described below with reference to the attached drawings.

The motor 1 according to this embodiment includes a housing 2 as shown in Figs. 1 to 3, a cylindrical stator 3 fixed inside the housing 2 as shown in Fig. 5, a rotor 4 facing the stator 3, and a refrigerant supply means 5 for supplying a refrigerant for cooling the rotor 4.

Although not numbered, the stator 3 is provided with a coil.

The rotor 4 is disposed opposite the inner peripheral surface of the stator 3 and has a rotor core 40 which is a magnetic body formed from laminated steel plates and has permanent magnets built in, a core support member 41 which supports the rotor 4 rotatably relative to the stator 3 within the housing 2, and a cooling section 42 which cools the inside of the rotor.

The motor 1 according to this embodiment is a so-called radial gap motor, in which the rotor 4 rotates inside the stator 3 on which the coil is provided. Note that a known configuration can be used to rotate the rotor 4 relative to the stator 3.

Here, the core support member 41 is configured to have a rotating shaft attached thereto for transmitting the rotational force of the rotor 4 to the outside. As shown in FIG. 4, the core support member 41 of this embodiment has a cylindrical sleeve 410 that is cylindrical and houses the cooling section 42, and an end wall section 411 attached to the end of the sleeve 410.

The cooling section 42 is cylindrical, and before being assembled into the motor 1, it is made up of a fin forming section 421 that is open at both ends in the axial direction and has heat dissipation fins 420 formed therein, a nozzle forming section 422 that is open at both ends in the axial direction and has a nozzle section 422b formed therein and is disposed within the fin forming section 421, and a supply space forming section 425 that is disposed within the nozzle forming section 422.

As shown in FIG. 4, the outer peripheral surface of the fin forming portion 421 is engaged with the inner peripheral surface of the sleeve 410, and is fixed so as to be unable to rotate relative to the sleeve 410.

A plurality of fins 420 are formed on the inner peripheral surface of the fin forming portion 421 so as to protrude radially inward. Each fin 420 is formed so as to protrude from the inner peripheral surface of the fin forming portion 421 toward the outer peripheral surface of the nozzle forming portion 421. Note that although the shape of the fin 420 in this embodiment is pin-shaped, it may be, for example, plate-shaped or strip-shaped as long as it is a shape suitable for heat exchange.

The nozzle forming portion 422 has a cylindrical tubular base portion 422a that is arranged inside the core portion 40 within the sleeve 420, and a nozzle portion 422b that protrudes radially outward (radially outward from the tubular base portion 422a) from the outer peripheral surface of the tubular base portion 422a.

The cylindrical base portion 422a is made of metal. The outer diameter of the cylindrical base portion 422a is smaller than the inner diameter of the fin forming portion 421. Furthermore, the cylindrical base portion 422a is disposed such that the entire outer circumferential surface faces the inner circumferential surface of the fin forming portion 421 at a distance. In addition, the cylindrical base portion 422a has a plurality of through holes 422aa formed therethrough in the radial direction, as shown in FIG. 7.

The nozzle portion 422b is cylindrical. The nozzle portion 422b protrudes radially outward from the outer circumferential surface of the cylindrical base portion 422a, and is configured such that an internal hole (referred to as a nozzle hole) 422ba is in communication with the through hole 422aa of the cylindrical base portion 422a (i.e., the inner space of the cylindrical base portion 422a is in communication with the outer space).

For convenience, the fin 420 and the nozzle portion 422b are not shown in Figures 5 to 6, and the through hole 422aa of the cylindrical base portion 422a, which will be described later, is not shown in Figures 4 to 6.

The supply space forming portion 425 is made of metal. The outer diameter of the supply space forming portion 425 is smaller than the inner diameter of the cylindrical base portion 422a of the nozzle forming portion 422. Furthermore, the supply space forming portion 425 is disposed such that the entire outer circumferential surface faces the inner circumferential surface of the cylindrical base portion 422a with a gap therebetween.

As shown in Figs. 8 and 9, the nozzle forming portion 422 in this embodiment is formed using a nozzle forming member 423 having a plate-shaped portion 423a in which a plurality of communication holes 423aa (see Fig. 9) are formed, and a plurality of cylindrical portions 423b that are cylindrical and are integrally erected on the plate-shaped portion 423a so that their interiors communicate with the communication holes 423aa.

Also, as shown in FIG. 10(b), the tube portion 423b of the nozzle forming member 423 corresponds to the nozzle portion 422b in the nozzle forming part 422.

The nozzle forming member 423 is made of a flexible material such as synthetic rubber, and can be formed by injection molding or the like. The nozzle forming member 423 may be made of a material other than synthetic rubber, but it is preferable to use a lightweight material.

The method of forming the nozzle portion 422b of the nozzle forming part 422 using the nozzle forming member 423 includes an arrangement step of arranging the nozzle forming member 423 at a fixed position on the cylindrical base portion 422a (see FIG. 10(a)), and after the arrangement step, a fixing step of fixing the nozzle forming member 423 to the cylindrical base portion 422a (FIG. 10(b)).

11, in the arrangement step, the tubular portion 423b of the nozzle forming member 423 is inserted into the through hole 422aa of the cylindrical base portion 422a, and the nozzle forming member 423 is arranged on the cylindrical base portion 422a so that the radially inner side of the nozzle forming member 423 communicates with the radially outer side of the cylindrical base portion 422a via the internal space (nozzle hole 422ba) of the tubular portion 423b. Note that in the arrangement step of this embodiment, the nozzle forming member 423 is arranged inside the inner peripheral surface of the cylindrical base portion 422a.

In the fixing process, the outer surface of the plate-shaped portion 423a is fixed to the inner peripheral surface of the cylindrical base portion 422a while the outer surface of the plate-shaped portion 423a is in intimate contact with the inner peripheral surface of the cylindrical base portion 422a. In this process, if both ends of the plate-shaped portion 423a (both ends in the direction corresponding to the circumferential direction of the cylindrical base portion 422a) are joined in a butted state, it is possible to prevent the refrigerant supplied to the internal space of the cylindrical base portion 422a (the space inside the plate-shaped portion 423a) from leaking out from between the both ends of the plate-shaped portion 423a.

As shown in FIG. 7, the shorter the distance C between the tip of the nozzle portion 422b and the inner circumferential surface of the fin forming portion 421, the better the cooling performance, but the greater the flow path resistance. When the inner diameter d of the nozzle portion 422b is used as a reference, it is preferable that the distance C between the tip of the nozzle portion 422b and the inner circumferential surface of the fin forming portion 421 is larger than the inner diameter d of the nozzle portion 422b.

In addition, shortening the length L of the nozzle portion 422b reduces the weight of the nozzle portion 422b, but reduces the flow path cross-sectional area (the area from the outer peripheral surface of the cylindrical base portion 422a to the tip of the nozzle portion 422b) for discharging the refrigerant that collides with the inner peripheral surface of the fin forming portion 421, resulting in increased flow path resistance. Therefore, when the length L of the nozzle portion 422b is taken as the standard, it is preferable that the distance C between the tip of the nozzle portion 422 and the inner peripheral surface of the fin forming portion 421 is smaller than the length L of the nozzle portion 422b.

The smaller the pitch p (the distance between the central axes of adjacent nozzle parts 422b), the better the cooling performance; however, the space used to discharge the refrigerant is occupied by a large number of nozzle parts 422b, so the refrigerant becomes less easily discharged and the flow path resistance increases.

Furthermore, as shown in Figs. 12(a) and 12(b), it is preferable that the fin 420 is arranged at a position that is not concentric with the nozzle portion 422b (at a position offset from the front of the nozzle portion 422b in the axial direction of the nozzle portion 422b). In this way, the fin forming portion 421 can be arranged outside the region (so-called stagnation region) A through which the impinging jet flows when it is sprayed from the nozzle portion 422b and impinges on the inner peripheral surface of the fin forming portion 421, so that the flow of the impinging jet is not disturbed by the fin 420, and cooling can be performed efficiently by the impinging jet.

In addition, the area outside area A where the impinging jet flows is an area where it is difficult to cool the fin forming portion 421 with the refrigerant, but since the fins 420 are arranged in this area, heat exchange also takes place between the fins 420 and the refrigerant, further increasing the cooling efficiency.

As shown in FIG. 6, each end wall portion 411 has an end wall main body portion 411a to which the end of the cylindrical base portion 422a, the end of the fin forming portion 421, and the end of the supply space forming portion 425 are fixed, and a shaft fixing portion 411b provided in the end wall main body portion 411a and having a shaft hole through which a rotating shaft can be inserted.

As described above, the end of the nozzle forming portion 422, the end of the fin forming portion 421, and the end of the supply space forming portion 425 are fixed to the end wall main body portion 411a, so that the internal space of the rotor 4 (sleeve 410) is divided by the nozzle forming portion 422 into the space between the supply space forming portion 425 and the nozzle forming portion 422 (the space marked with the symbol S1 in FIG. 5) and the space between the nozzle forming portion 422 and the fin forming portion 421 (the space marked with the symbol S2 in FIG. 5).

As shown in FIG. 5, the end wall body portion 411a is provided with a refrigerant supply port 411aa for supplying refrigerant into the space S1 and a refrigerant discharge port 411ab for discharging the refrigerant from the space S2.

The refrigerant supplied from the refrigerant supply port 411aa to the space S1 by the refrigerant supply means 5 passes through the nozzle portion 422b to the space S2, and is then discharged from the refrigerant discharge port 411ab.

The inner diameter of the shaft hole of the shaft fixing part 411b is smaller than the inner diameter of the supply space forming part 425. In other words, the outer diameter of the shaft that serves as the rotating shaft that passes through the shaft hole is also smaller than the inner diameter of the supply space forming part 425.

Here, the housing 2 in this embodiment has a case portion 20 that houses the stator 3, and a pair of rotation support portions 21 that rotatably support the shaft fixing portion 411b relative to the case portion 20.

The rotation support parts 21 are arranged at both ends of the case part 20, and are configured to have bearings that rotatably support the shaft fixing part 411b at the center (the center in the radial direction). Therefore, in the motor 1, the rotor core part 40, core part support member 41, and cooling part 42 that constitute the rotor 4 rotate together with the stator 3 and housing 2.

The refrigerant supply means 5 may be, for example, a fan, blower, pump, or the like, attached to the refrigerant supply port 411aa of the core support member 41 so as to be capable of continuously supplying the refrigerant. The refrigerant may be a liquid, as well as a gas.

The configuration of the motor 1 according to this embodiment is as described above. Next, we will explain the flow of the refrigerant in the motor according to this embodiment.

As shown in FIG. 13, the refrigerant supplied to the space S1 in the nozzle forming portion 422 by the refrigerant supply means 5 flows from inside the nozzle forming portion 422 through the nozzle portion 422b toward the space S2 between the nozzle forming portion 422 and the fin forming portion 421.

As shown in FIG. 14, the refrigerant that enters the nozzle portion 422b flows in a direction perpendicular to the inner circumferential surface of the fin forming portion 421. At this time, the refrigerant is in a jet state and flows so as to collide with the inner circumferential surfaces of the fin 420 and the fin forming portion 421, and then flows along the inner circumferential surface side of the fin forming portion 421 and is discharged to the outside of the space S2 through the refrigerant discharge port 411ab.

While the refrigerant supply means 5 continues to send refrigerant to the refrigerant supply port 411aa, fresh refrigerant (refrigerant before heat exchange with the inner circumferential surfaces of the fins 420 and fin forming portion 421) is constantly supplied to the inner circumferential surfaces of the fins 420 and fin forming portion 421. Therefore, in the space S2, fresh refrigerant continues to flow toward the fin forming portion 421, and refrigerant that has exchanged heat with the inner circumferential surfaces of the fins 420 and rotor core portion 40 flows toward the nozzle forming portion 422b.

As described above, the motor 1 according to this embodiment is configured so that the refrigerant is sent from the nozzle portion 422 protruding from the outer peripheral surface of the nozzle forming portion 422b toward the inner peripheral surface of the fin forming portion 421, and the refrigerant that flows from the nozzle portion 422b toward the inner peripheral surface of the fin forming portion 421 exchanges heat with the fin forming portion 421 before flowing toward the base end side of the nozzle portion 422b.

Therefore, the space S2 is easily filled with fresh refrigerant before heat exchange on the fin forming portion 421 side, and the refrigerant after heat exchange is easily collected on the fin forming portion 421 side. This improves the cooling performance of the cooling portion 42. In addition, in the motor 1 of this embodiment, the nozzle portion 422b generates a jet of refrigerant, so it is possible to apply the refrigerant over a wide area from the base end to the tip end of the fin 420, further improving the cooling performance.

In addition, in the motor 1 of this embodiment, by providing multiple heat dissipation fins 420 protruding from the inner circumferential surface of the fin forming portion 421, heat generated in the fin forming portion 421 is easily transferred to the fins 420. Therefore, the heat of the fin forming portion 421 can be released to the fins 420, and the heat generated in the fin forming portion 421 can be exchanged with the refrigerant using both the inner circumferential surface of the fin forming portion 421 and the fins 420, further improving the cooling performance of the rotor core portion 40.

In addition, in this embodiment, the refrigerant supply means 5, which is composed of a fan or the like, can continuously supply the refrigerant to the refrigerant supply port 411aa, so that the refrigerant can be stably sent to the inner surface of the fin forming portion 421. Therefore, the motor of this embodiment can also stabilize the cooling performance of the fin forming portion 421.

In the motor 1 of this embodiment, the plate-shaped portion 423a of the nozzle forming member 423 is attached to the inner or outer peripheral surface of the cylindrical base portion 422a in a stacked manner, so that multiple nozzle portions 422b can be formed at once.

In this way, the motor 1 of this embodiment uses a nozzle forming member 423 in which multiple nozzle portions 422b are integrally erected on the plate-shaped portion 423a, which reduces the effort required to provide multiple nozzle portions 422b compared to attaching multiple nozzle portions 422b one by one to the cylindrical base portion 422a, and this makes it easier to manufacture a motor 1 with improved cooling performance.

The motor according to the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

Although not specifically mentioned in the above embodiment, the tip of the fin 420 is located radially outward from the tip of the nozzle portion 422b.

Although not specifically mentioned in the above embodiment, when the rotor 1 is viewed from the radial direction, the fins 420 and the nozzle portion 422b may be arranged at positions offset from each other. For example, as shown in FIG. 15(a), they may be aligned alternately in the axial direction and circumferential direction of the cooling portion 42, or they may be arranged intermittently as shown in FIG. 15(b). It is also possible to arrange the fins 420 in a row or column as shown in FIG. 15(c).

In the above embodiment, the communication hole 423aa of the nozzle forming member 423 is formed to have a tapered shape so that the cylindrical portion 423b side is narrower, but this configuration is not limited. For example, the inner diameter of the communication hole 423aa may be constant over its entire length.

In the above embodiment, the plate-shaped portion 423a of the nozzle forming member 423 is superimposed on the inner peripheral surface of the cylindrical base portion 422a, but this configuration is not limited to this. For example, the plate-shaped portion 423a of the nozzle forming member 423 may be superimposed on the outer peripheral surface of the cylindrical base portion 422a as shown in FIG. 16(a), or further, only the cylindrical portion 423b (a member constituting the nozzle portion 422b) may be provided directly on the cylindrical base portion 422a as shown in FIG. 16(b).

When using the nozzle forming member 423 shown in FIG. 16(a), in the arrangement step, the nozzle forming member 422 is arranged on the cylindrical base portion 422a so that the communication hole 423aa of the plate-shaped portion 423a, the space inside the cylindrical portion 423b, and the through hole 422aa of the cylindrical base portion 422a are mutually connected (see FIG. 17(a) and FIG. 18), and in the fixing step, the inner surface of the plate-shaped portion 423a is fixed to the outer peripheral surface of the cylindrical base portion 422a with the inner surface of the plate-shaped portion 423a in close contact with the outer peripheral surface of the cylindrical base portion 422a (see FIG. 17(b)). Even in this case, multiple nozzle portions 422b can be formed at once.

As shown in FIG. 16(b), when only the members constituting the nozzle portion 422b are directly attached to the cylindrical base portion 422a, the nozzle portion 422b may be fixed to the outer peripheral surface of the cylindrical base portion 422a, or may be fixed to the cylindrical base portion 422a in a state where it is inserted into the through hole 422aa of the cylindrical base portion 422a.

Although not specifically mentioned in the above embodiment, metal may be insert molded into the nozzle forming member 423. In this way, the strength of the nozzle forming member 423 can be increased.

In the above embodiment, the nozzle forming member 423 is flat (sheet-shaped), but is not limited to this configuration. For example, the nozzle forming member 423 may be formed in advance into a cylindrical shape.

In the motor 1 of the above embodiment, the refrigerant is supplied from the refrigerant supply port 411aa to the space inside the cylindrical base portion 422a by the refrigerant supply means 5, but this configuration is not limited to this. For example, it is possible to take in outside air into the space inside the cylindrical base portion 422a, and then use centrifugal force to spray the air inside the cylindrical base portion 422a through the nozzle portion 422b toward the rotor core portion 40. In addition, the refrigerant supply means 5 does not have to be attached to the core portion support member 41. For example, a piping duct may be used to connect the refrigerant supply port 411aa of the core portion support member 41 to a fan or the like installed outside the motor 1 to send the refrigerant.

Although not specifically mentioned in the above embodiment, the motor 1 is a so-called direct drive motor, and is used, for example, as a motor for driving an aircraft propeller. In addition, when used as a motor for driving an aircraft propeller, a low rotation speed and a lightweight are required, so the core support member 41 has a hollow structure.

In the motor 1 of the above embodiment, the refrigerant discharge port 411ab is formed in both the core support member 41 and the rotation support portion 21, but this configuration is not limited. For example, it may be formed in only one of them so that the refrigerant is discharged to the outside of the space S2.

In the motor 1 of the above embodiment, the space S1 is formed between the supply space forming portion 425 and the nozzle forming portion 422, but this configuration is not limited to this. For example, when the shaft is inserted into the axial hole, the space between the outer peripheral surface of the shaft and the inner peripheral surface of the nozzle forming portion 422 may be used as the space S1. In this case, it is possible to effectively utilize the internal space of the motor 1 so that it does not become dead space.

In the motor 1 of the above embodiment, the supply space forming portion 425 is made of metal, but this is not limited to this, and a lightweight, high-strength material such as CFRP (carbon fiber reinforced plastic) may also be used.

1...motor, 2...housing, 3...stator, 4...rotor, 5...refrigerant supply means, 20...case, 21...rotation support, 40...core, 41...fin, 42...core support member, 420...sleeve, 421...cylindrical base, 421a...through hole, 422...nozzle, 423...end wall, 423a...end wall main body, 423aa...refrigerant supply port, 423ab...refrigerant discharge port, 423b...shaft fixing portion, 424...nozzle forming member, 424a...plate-shaped portion, 424aa...communicating hole, 424b...cylindrical portion, 425...supply space forming portion, C...distance between tip of nozzle and inner peripheral surface of core, d...inner diameter of nozzle, L...length of nozzle, p...forming pitch of nozzle

Claims (4)

A stator;
a rotor disposed within the stator;
The rotor is
a rotor core portion having a cylindrical shape and arranged such that an outer peripheral surface of the rotor core faces an inner peripheral surface of the stator;
a core portion support member that rotatably supports the rotor core portion relative to the stator;
a cooling unit that cools the rotor core unit,
The cooling unit includes:
a cylindrical base portion that is cylindrical and that is disposed radially inwardly and spaced apart from an inner circumferential surface of the rotor core portion;
a nozzle portion formed to extend from an outer circumferential surface of the cylindrical base portion toward an inner circumferential surface of the rotor core portion and to communicate an inside and an outside of the cylindrical base portion,
The core portion support member is
a refrigerant supply port for passing a refrigerant to be supplied into the cylindrical base portion;
a coolant discharge port for discharging a coolant from between the rotor core portion and the cylindrical base portion,
motor. The cooling unit includes:
The rotor core has heat dissipation fins that protrude directly or indirectly from an inner circumferential surface of the rotor core.
2. The motor according to claim 1. A refrigerant supplying means for supplying a refrigerant to the refrigerant supply port is provided.
The motor according to claim 1 or 2. a nozzle forming member including a plate-shaped portion formed of a soft material in a flat plate shape and having a plurality of through holes formed therein, and a plurality of tubular portions constituting the nozzle portion, the plurality of tubular portions being integrally provided upright on the plate-shaped portion such that the interiors of the tubular portions communicate with the through holes;
The cylindrical base portion is formed with a plurality of through holes extending radially therethrough,
The plate-like portion is attached to an inner circumferential surface or an outer circumferential surface of the cylindrical base portion in a state in which each of the plurality of cylindrical portions is arranged in accordance with the position of the through hole of the cylindrical base portion.
The motor according to any one of claims 1 to 3.