Abstract: A robot wheel driving apparatus includes a wheel to which a tire is coupled and configured to drive a robot, a wheel cover covering and coupled to both sides of the wheel, a motor housing inserted into the wheel, and a motor embedded in the motor housing and configured to provide a rotating force to the wheel. The wheel cover includes a wheel cover hole configured to allow air to flow from an outside of the wheel cover toward the wheel, and the wheel includes a wheel hole configured to allow air flowing into the wheel through the wheel cover hole to flow toward the motor housing, and a blade configured to allow air to flow between the wheel and the motor housing by rotation of the wheel.

Abstract: The present invention relates to a motor comprising: a motor housing; a stator which is provided in the motor housing and has a coil; a rotor installed in the stator to be rotatable about a rotary shaft; and a spray hole which is formed in the circumferential surface of the rotor by passing through the circumferential surface in a radial direction and which sprays a cooling fluid in the motor housing onto the coil according to the rotation of the rotor. Therefore, cooling by oil convection can be accelerated while minimizing resistance due to the oil.

Abstract: The present invention relates to a motor comprising: a motor housing; a stator which is provided in the motor housing and has a coil; a rotor installed in the stator to be rotatable about a rotary shaft; and a spray hole which is formed in the circumferential surface of the rotor by passing through the circumferential surface in a radial direction and which sprays a cooling fluid in the motor housing onto the coil according to the rotation of the rotor. Therefore, cooling by oil convection can be accelerated while minimizing resistance due to the oil.

Abstract: The present invention relates to a motor comprising: a motor housing for receiving a stator and a rotor therein; an outer housing detachably coupled to the outside of the motor housing; a first cooling path which is formed inside the outer housing and in which a first cooling fluid flows; a second cooling path which is formed inside the motor housing and in which a second cooling fluid flows to be capable of exchanging heat with the first cooling fluid; and a plurality of spray holes interconnected to one side of the first cooling path and formed to extend through the motor housing toward an inner space of the motor housing from the outer housing to spray the first cooling fluid into the inner space of the motor housing, and thus the present invention allows an oil path housing for oil-cooling to be easily attached to or detached from a water-cooling path housing.

Abstract: The present invention relates to a motor having dual flow paths of an oil-water composite cooling method, the motor comprising: a motor housing accommodating a stator and a rotor therein; and the dual flow paths formed inside the motor housing so as to cool the stator and the rotor by means of the oil-water composite cooling method, wherein the dual flow paths comprise: an oil flow path formed in a spiral shape such that oil flows inside a wall body of the motor housing; and a cooling water flow path formed in a spiral shape such that cooling water flows inside the wall body of the motor housing, and can improve cooling efficiency and cooling performance.

Abstract: The present invention relates to a drive system for an electric automobile, the drive system comprising: a motor housing having a cooling water inlet port and a cooling water outlet port formed at an upper part thereof; a first cooling water fluid channel communicating with the cooling water inlet port and the cooling water outlet port, and disposed inside the motor housing; an inverter housing including a rear cover forming the rear surface to face the motor housing in the lengthwise direction; a heat exchange plate disposed inside the rear cover and forming a second cooling water fluid channel inside thereof; a cooling water inlet hole formed at an upper part of the rear cover to communicate with a portion of the first cooling water fluid channel extending from the cooling water inlet port in the axial direction of the motor housing, and allowing cooling water introduced through the cooling water inlet port to directly flow into the second cooling water fluid channel; and a cooling water outlet hole formed

Abstract: The present invention relates an electric motor comprising: a motor housing; a stator disposed inside the motor housing; and a rotor rotatably installed inside the stator, wherein the motor housing comprises: an outer housing including a first cooling fluid channel through which oil flows; an inner housing disposed inside the outer housing; and a plurality of injection holes formed in the inner housing to communicate with the first cooling fluid channel, so as to inject the oil to the inside of the inner housing, and the inner housing comprises: a plurality of fluid channel forming parts extending inside the inner housing along the circumferential direction thereof; a fluid channel guide extending along the lengthwise direction of the inner housing; and a common header disposed between the plurality of fluid channel forming parts and the fluid channel guide to distribute the cooling water to the second cooling fluid channel or to collect the cooling water from the second cooling fluid channel.

Abstract: Disclosed herein is a motor including a shaft, a rotor, a motor housing forming an inner space to receive the shaft and the rotor therein, a stator received in the motor housing and disposed outside the rotor based on a radial direction of the shaft, a first flow path disposed outside the stator based on the radial direction of the shaft such that a first fluid flows in the first flow path, the first fluid being discharged to the inner space and cooling the stator and the rotor, and a second flow path disposed between the first flow path and the stator based on the radial direction of the shaft such that a second fluid flows in the second flow path, the second fluid absorbing heat of the stator transferred through a flow path wall.

Abstract: A brushless direct current (BLDC) motor is disclosed. The BLDC motor includes a shaft made of a nonmagnetic material, a plurality of magnets surrounding the outer circumference of the shaft, a stator surrounding the outer circumferences of the magnets, wherein each of the magnets has an arc-shaped outer circumferential surface, an arc-shaped inner circumferential surface facing the shaft, and opposite side surfaces facing other adjacent magnets, and the magnets include a first magnet magnetized in a direction directed from the outer circumferential surface to the inner circumferential surface, a second magnet magnetized in a direction directed from the inner circumferential surface to the outer circumferential surface, and a third magnet magnetized in a direction directed from one side surface to the other side surface. The efficiency of the motor is improved while eddy current loss is minimized.

Abstract: A Blushless Direct Current (BLDC) motor may include a motor housing; a stator including a stator core installed within the motor housing and a coil wound in the stator core and that generates a magnetic field by applied power; and a rotor disposed within the stator and in which a magnet that interacts with the magnetic field is installed and that rotates within the stator by an interaction with the magnetic field. The stator core may include a back yoke in which straight portions and curved portions are alternately formed; and teeth protruded from the back yoke toward the magnet. The tooth include a neck protruded from the back yoke, and a shoe protruded from the neck and separated from the magnet and that encloses at least a portion of the magnet. A ratio A/B of a width A of the neck to a width B of a shoe end portion is 2.5 to 3.5. By optimizing a ratio A/B of a width A of the neck to a width B of the shoe end portion constituting the stator core, efficiency of a BLDC motor may be maximized.

Abstract: Disclosed herein is a motor including a shaft, a rotor, a motor housing forming an inner space to receive the shaft and the rotor therein, a stator received in the motor housing and disposed outside the rotor based on a radial direction of the shaft, a first flow path disposed outside the stator based on the radial direction of the shaft such that a first fluid flows in the first flow path, the first fluid being discharged to the inner space and cooling the stator and the rotor, and a second flow path disposed between the first flow path and the stator based on the radial direction of the shaft such that a second fluid flows in the second flow path, the second fluid absorbing heat of the stator transferred through a flow path wall.

Abstract: A brushless direct current (BLDC) motor is disclosed. The BLDC motor includes a shaft made of a nonmagnetic material, a plurality of magnets surrounding the outer circumference of the shaft, a stator surrounding the outer circumferences of the magnets, wherein each of the magnets has an arc-shaped outer circumferential surface, an arc-shaped inner circumferential surface facing the shaft, and opposite side surfaces facing other adjacent magnets, and the magnets include a first magnet magnetized in a direction directed from the outer circumferential surface to the inner circumferential surface, a second magnet magnetized in a direction directed from the inner circumferential surface to the outer circumferential surface, and a third magnet magnetized in a direction directed from one side surface to the other side surface. The efficiency of the motor is improved while eddy current loss is minimized.

Abstract: A Blushless Direct Current (BLDC) motor may include a motor housing; a stator including a stator core installed within the motor housing and a coil wound in the stator core and that generates a magnetic field by applied power; and a rotor disposed within the stator and in which a magnet that interacts with the magnetic field is installed and that rotates within the stator by an interaction with the magnetic field. The stator core may include a back yoke in which straight portions and curved portions are alternately formed; and teeth protruded from the back yoke toward the magnet. The tooth include a neck protruded from the back yoke, and a shoe protruded from the neck and separated from the magnet and that encloses at least a portion of the magnet. A ratio A/B of a width A of the neck to a width B of a shoe end portion is 2.5 to 3.5. By optimizing a ratio A/B of a width A of the neck to a width B of the shoe end portion constituting the stator core, efficiency of a BLDC motor may be maximized.