A cooling structure is provided that cools a rotor in a motor. The motor includes a shaft that is rotatably supported on a case and a rotor having a rotor core to which a plurality of magnets are provided on an outer periphery of the shaft and which is disposed to face a stator. Flow passages are formed on the shaft and the rotor and cooling oil passes through a core flow passage inside the rotor core from an introduction flow passage on a first side in an axial direction of the shaft and flows to the introduction flow passage on a second side in the axial direction of the shaft. An inlet communicating with the introduction flow passage and an outlet communicating with the introduction flow passage are formed in the case.
1. A motor, comprising:
a shaft rotatably supported on a case formed with a front wall, a side wall, and a rear wall;
a rotor having a rotor core to which a plurality of magnets are provided on an outer periphery of the shaft and disposed to face a stator; and
flow passages formed on the shaft and the rotor and cooling oil passes through a core flow passage inside the rotor core from an inflow passage formed in a first side of the shaft in an axial direction of the shaft and flows to a discharge passage formed in a second side of the shaft in the axial direction of the shaft,
wherein an inlet in communication with the inflow passage is formed in the front wall of the case in an orthogonal direction to the axial direction of the shaft and an outlet in communication with the discharge passage is formed in the rear wall of the case in an orthogonal direction to the axial direction of the shaft.
2. The motor of claim 1 , wherein the inflow passage and the core flow passage are connected to each other by a supply flow passage, the core flow passage and the discharge passage are connected to each other by a discharge flow passage, the core flow passage and the core flow passage are connected to each other by a return flow passage, and the supply flow passage and the discharge flow passage are formed by branched flow passages which are branched into at least two.
3. The motor of claim 2 , wherein the rotor core has a structure in which a plurality of electronic steel plates are stacked by bonding and the plurality of magnets are embedded in the electronic steel plates.
4. The motor of claim 2 , wherein each of the branched flow passages is connected to the core flow passage which is provided in an odd number.
5. The motor of claim 2 , wherein both sides of the rotor core are disposed between end plates, and the supply flow passage and the discharge flow passage are provided on the end plate.
6. The motor of claim 5 , wherein the rotor core has a structure in which a plurality of electronic steel plates are stacked by bonding and the plurality of magnets are embedded in the electronic steel plates.
7. The motor of claim 1 , wherein the rotor core has a structure in which a plurality of electronic steel plates are stacked by bonding and the plurality of magnets are embedded in the electronic steel plates.
8. The motor of claim 1 , where the core flow passage and the discharge passage are connected to each other by a discharge flow passage.
9. The motor of claim 8 , wherein a leading end of the discharge passage includes four outlet apertures in a direction orthogonal to the axial direction of the shaft.
10. A vehicle including a motor of claim 1 .
11. A motor, comprising:
a shaft rotatably supported on a case formed with a front wall, a side wall, and a rear wall;
a rotor having a rotor core to which a plurality of magnets are provided on an outer periphery of the shaft and disposed to face a stator; and
flow passages formed on the shaft and the rotor and cooling oil passes through a core flow passage inside the rotor core from an inflow passage on a first side of the shaft in an axial direction of the shaft and flows to a discharge passage on a second side of the shaft in the axial direction of the shaft,
wherein an inlet in communication with the inflow passage is formed in the front wall of the case in an orthogonal direction to the axial direction of the shaft and an outlet in communication with the inflow passage is formed in the rear wall of the case in an orthogonal direction to the axial direction of the shaft,
wherein a leading end of the discharge passage includes a plurality of outlet apertures formed in a direction orthogonal to the axial direction of the shaft such that when one of the plurality of the outlet apertures and the outlet coincide with each other while the shaft is rotating,
the cooling oil is discharged to an outside of the case through the one of the plurality of outlet apertures and the outlet.