Motor having cooling structure
A motor may include a stator with a coil disposed on an inner side thereof, a rotor at least partially surrounded by the coil and having an accommodation space in which a refrigerant for cooling the coil may be accommodated, a shaft connected to the rotor to rotate integrally with the rotor, and a pipe communicating with the accommodation space so that the refrigerant may be introduced from an external source and the refrigerant flows into the accommodation space therethrough.
1 . A motor comprising:
a stator with a coil disposed on an inner side thereof;
a rotor at least partially surrounded by the coil;
a shaft connected to the rotor to rotate integrally with the rotor; and
a pipe at least partially inserted into the shaft and through which a refrigerant for cooling the coil flows,
wherein the pipe rotates integrally with the rotor and the shaft
wherein the pipe comprises an inlet and an outlet,
wherein the outlet comprises a first outlet corresponding to an upper end portion of the coil and a second outlet corresponding to a lower end portion of the coil, and each of the first outlet and the second outlet is formed as one or more outlets,
wherein the first outlet comprises a first outlet hole formed in the first outlet and the second outlet comprises a second outlet hole formed in the second outlet, wherein the first outlet hole and the second outlet hole are configured to communicate with an inlet hole formed in the inlet, and
wherein the inlet hole, the first outlet hole, and the second outlet hole are exposed to an outside of the shaft and communicate with the outside of the shaft.
2 . The motor of claim 1 , wherein the refrigerant flows from outside into the inlet, and wherein the outlet is connected to the inlet and configured to discharge the refrigerant toward the coil.
3 . The motor of claim 2 , wherein the outlet is formed in positions corresponding to both a first end portion and a second end portion of the coil.
4 . The motor of claim 2 , wherein a flow path for the refrigerant to flow therethrough is formed inside the outlet, and the flow path comprises at least one of a shape with a constant cross-sectional area, a shape with a variable cross-sectional area, or an inclined shape.
5 . The motor of claim 1 , further comprising a magnet or a conductor bar disposed inside the rotor, wherein the rotor rotates about an axis of rotation based on electromagnetic interaction between the magnet or the conductor bar and the coil, and the inlet extends substantially parallel to the axis of rotation, and the first outlet and the second outlet extend substantially perpendicular to the axis of rotation from the inlet.
6 . The motor of claim 1 , wherein:
the inlet hole is configured to communicate with a refrigerant tank supplying the refrigerant.
7 . The motor of claim 6 , wherein the inlet is inserted into the shaft through an upper end portion of the shaft, and the first outlet and the second outlet protrude from an outer surface of the shaft through the shaft.
8 . The motor of claim 6 , wherein the inlet hole, the first outlet hole, and the second outlet hole have a circular or polygonal shape.
9 . The motor of claim 1 , wherein the refrigerant is a cryogenic refrigerant comprising liquid nitrogen or liquid hydrogen.
10 . A motor comprising:
a stator with a coil disposed on an inner side thereof;
a rotor at least partially surrounded by the coil;
a shaft connected to the rotor to rotate integrally with the rotor; and
a pipe at least partially inserted into the shaft and through which a refrigerant for cooling the coil flows,
wherein the pipe rotates integrally with the rotor and the shaft
wherein the pipe comprises an inlet and an outlet,
wherein the outlet comprises a first outlet corresponding to an upper end portion of the coil and a second outlet corresponding to a lower end portion of the coil, and each of the first outlet and the second outlet is formed as one or more outlets, and
wherein the inlet is inserted into the shaft through an upper end portion of the shaft, and the first outlet and the second outlet protrude from an outer surface of the shaft through the shaft.
11 . The motor of claim 10 , wherein:
an inlet hole of the inlet is configured to communicate with a refrigerant tank supplying the refrigerant.
12 . The motor of claim 10 , wherein the refrigerant flows from outside into the inlet, and wherein the outlet is connected to the inlet and configured to discharge the refrigerant toward the coil.
13 . The motor of claim 10 , wherein the refrigerant is a cryogenic refrigerant comprising liquid nitrogen or liquid hydrogen.