JP-7856002-B2 - Rotor

JP7856002B2JP 7856002 B2JP7856002 B2JP 7856002B2JP-7856002-B2

Inventors

浅岡博則
宮園秀明
加藤弘樹
大和史明
横山喜一

Assignees

トヨタ自動車株式会社

Dates

Publication Date: 20260511
Application Date: 20221228

Claims (5)

A shaft that extends axially and through which a refrigerant flows, A rotor core fixed to the aforementioned shaft, A first end plate located on one axial side of the rotor core, A second end plate located on the other axial side of the rotor core, Equipped with, The rotor core comprises a first flow path for flowing the refrigerant from one axial side to the other axial side, and a second flow path for flowing the refrigerant from the other axial side to the one axial side. The first end plate includes a first connecting passage for flowing the refrigerant from the shaft to the first flow path and a first main discharge passage for flowing the refrigerant from the shaft to the outside. The second end plate includes a second connecting passage for flowing the refrigerant from the shaft to the second passage and a second main discharge passage for discharging it from the shaft to the outside. The first main discharge passage is a passage that branches off from the first connecting passage at a position in the radial direction that does not reach the first passage, and discharges the refrigerant from the shaft diagonally from the first end plate toward the radially outer side of the rotor core and toward one side in the axial direction. The rotor is a rotor in which the second main discharge passage branches off from the second connecting passage at a position in the radial direction that does not reach the second passage, and discharges the refrigerant from the shaft diagonally from the second end plate toward the radially outer side of the rotor core and toward the other axial side .
The first connecting passage is configured such that the amount of refrigerant supplied to the first passage is greater than that supplied to the first main discharge passage. The rotor according to claim 1 , wherein the second connecting passage is configured such that the amount of refrigerant supplied to the first passage is greater than that supplied to the second main discharge passage.
The first end plate is provided with a first sub-discharge channel for discharging the refrigerant that reaches through the second channel, The rotor according to claim 1, wherein the second end plate is provided with a second sub-discharge channel for discharging the refrigerant that reaches through the first channel.
The rotor according to claim 1, wherein the rotor core is provided with a plurality of first flow channels and a plurality of second flow channels alternately along the circumferential direction of the rotor core.
The rotor according to claim 1, wherein the first end plate and the second end plate are identical in shape and are fixed to the rotor core at a predetermined angle offset around the rotation axis of the shaft.

Description

The technology disclosed herein relates to rotors. The rotor, along with the stator core to which the coils are fixed, constitutes the motor. The rotor core is a cylindrical body that holds magnets internally and has a rotor shaft in its center. Furthermore, end plates are fixed to one axial side and the other side of the rotor core. During motor operation, the magnets and the coil ends extending axially from the stator need to be cooled. Conventionally, a technique for cooling magnets and coil ends involves supplying a coolant from the rotor shaft to the rotor core from one axial side of the rotor core via an end plate. Simultaneously, the coolant supplied through this end plate is discharged to the outside to cool the coil ends (Patent Document 1). Japanese Patent Publication No. 2021-151098 This figure shows one embodiment of the rotor disclosed herein, together with a stator, and shows a cross-sectional view along the axial direction of the rotor core.Figure 1 shows a plan view (a) of the rotor core as seen from the X side, and a plan view (b) of the end plate fixed to the X side of the rotor core as seen from the X side.Figure 1 shows a plan view (a) of the rotor core as seen from the Y side, and a plan view (b) of the end plate fixed to the Y side of the rotor core as seen from the Y side. The rotor of this disclosure comprises a shaft through which a refrigerant flows, a rotor core fixed to the shaft, a first end plate located on one axial side of the rotor core, and a second end plate located on the other axial side of the rotor core. The rotor core includes a first flow path for refrigerant flowing from one axial side to the other axial side, and a second flow path for refrigerant flowing from the other axial side to the one axial side. The first end plate includes a first connecting flow path for refrigerant flowing from the shaft to the first flow path, and a first main discharge flow path for refrigerant flowing from the shaft to the outside. The second end plate includes a second connecting flow path for refrigerant flowing from the shaft to the second flow path, and a second main discharge flow path for discharging refrigerant from the shaft to the outside. In one embodiment of this disclosure, the first end plate may be provided with a branched first connecting passage and a first main discharge passage. Similarly, the second end plate may be provided with a branched second connecting passage and a second main discharge passage. This simplifies the structure of the refrigerant passages in the shaft and the end plates. In this embodiment, the first connecting passage is a passage that receives refrigerant from the shaft and flows it into the first passage, and the first main discharge passage may be a passage that branches off from the first connecting passage. Furthermore, the second connecting passage is a passage that receives refrigerant flowing out from the shaft and flows it into the second passage, and the second main discharge passage may be a passage that branches off from the second connecting passage. This simplifies the structure of the refrigerant passages in the shaft and the end plate. Furthermore, in this embodiment, the first connecting passage may be configured such that the amount of refrigerant supplied to the first passage is greater than that supplied to the first main discharge passage, and the second connecting passage may be configured such that the amount of refrigerant supplied to the second passage is greater than that supplied to the second main discharge passage. This allows for sufficient cooling of the rotor core. In one embodiment of this disclosure, the first main discharge channel may be a channel that discharges refrigerant from the shaft diagonally from the first end plate toward one axial direction and radially outward from the rotor core. The second main discharge channel may also be a channel that discharges refrigerant from the shaft diagonally from the second end plate toward the other axial direction and radially outward from the rotor core. This arrangement may make it easier for the refrigerant, after passing through the first and/or second main discharge channels, to reach, for example, the coil ends of the stator positioned relative to the rotor. In one embodiment of this disclosure, the first end plate may be provided with a first secondary discharge channel for discharging refrigerant that reaches through the second flow path. The second end plate may also be provided with a second secondary discharge channel for discharging refrigerant that reaches through the first flow path. The refrigerant discharged through the first and second secondary discharge channels can improve or adjust the cooling capacity of the refrigerant on one axial side and the other. In one embodiment of this disclosure, the rotor core may be provided with a plurality of first channels and a plurality of second channels alternately along the circumferential direction of the