The present invention belongs to the technical field of washing machines, and particularly relates to a three-phase drainage motor for a washing machine. The three-phase drainage motor includes a stator, a rotor and an upper cover, wherein the rotor is sealed inside the stator through the upper cover; the stator includes an iron core, a coil bobbin, a three-phase coil and a plastic package portion, wherein the iron core includes a hub, an inner ring and teeth, the teeth radially connecting the hub to the inner ring, the inner ring being of a nine-section arc structure, the coil bobbin covers the teeth, the three-phase coil is wound around the coil bobbin, the plastic package portion is wrapped around the coil bobbin, the three-phase coil and the iron core to form a spigot, a rotor cavity and a rotary shaft cavity, the spigot is located above the rotor cavity, the rotary shaft cavity is at a bottom of the rotor cavity, the plastic package portion includes a housing, a wall surface of the rotor cavity and a wall surface of the rotary shaft cavity, and the housing, the wall surface of the rotor cavity and the wall surface of the rotary shaft cavity are molded through integral injection. The wall surface of the rotor cavity of the three-phase drainage motor for the washing machine provided by the present invention not only reduces an air gap of the motor to improve the motor efficiency, and meanwhile, prevents the noise problem caused by rust of nine sections of arc surfaces of the inner ring of the iron core.

A motor assembly has an outer stator (40), a rotor assembly (30), a separating can (50), and a first bearing (36) and a second bearing (37). The rotor assembly (30) has an inner rotor (32) and a shaft (31) and defines an axial direction (77) and a radial direction (78) of the motor assembly (20). The motor assembly (20) has a magnetic air gap (53) between the outer stator (40) and the inner rotor (32). The separating can (50) has a split tube component (51) and a separating can base part (52). The split tube component (51) has a split tube section (54). The split tube section (54) extends through the magnetic air gap (53). The outer stator (40) is arranged around the split tube section (54). The split tube section (51) and the separating can base part (52) overlap in a first predefined axial region (55). A seal (60) is provided between the split tube section (51) and the separating can base part (52) in the first predefined axial region (55).

A motor assembly has an outer stator (40), a rotor assembly (30), a separating can (50), and a first bearing (36) and a second bearing (37). The rotor assembly (30) has an inner rotor (32) and a shaft (31) and defines an axial direction (77) and a radial direction (78) of the motor assembly (20). The motor assembly (20) has a magnetic air gap (53) between the outer stator (40) and the inner rotor (32). The separating can (50) has a split tube component (51) and a separating can base part (52). The split tube component (51) has a split tube section (54). The split tube section (54) extends through the magnetic air gap (53). The outer stator (40) is arranged around the split tube section (54). The split tube section (51) and the separating can base part (52) overlap in a first predefined axial region (55). A seal (60) is provided between the split tube section (51) and the separating can base part (52) in the first predefined axial region (55).

A motor provided with: a resin sealing member that is made from a resin and that covers a stator; and a cover member that is fixed to the resin sealing member. The protrusions protruding radially outward are formed on the resin sealing member. A part of the cover member on a Z2 direction side thereof is configured as a cylindrical cover section covering the resin sealing member from the outer circumferential side. The cover section has formed therein notch sections, engagement grooves that extend toward one side in the circumferential direction from the ends of the notch sections on a Z1 direction side and with which the protrusions engage, and a stopper restricting movement of the cover member toward the other side in the circumferential direction. The widths of the notch sections are wider than the widths of the protrusions in the circumferential direction.

A motor provided with: a resin sealing member that is made from a resin and that covers a stator; and a cover member that is fixed to the resin sealing member. The protrusions protruding radially outward are formed on the resin sealing member. A part of the cover member on a Z2 direction side thereof is configured as a cylindrical cover section covering the resin sealing member from the outer circumferential side. The cover section has formed therein notch sections, engagement grooves that extend toward one side in the circumferential direction from the ends of the notch sections on a Z1 direction side and with which the protrusions engage, and a stopper restricting movement of the cover member toward the other side in the circumferential direction. The widths of the notch sections are wider than the widths of the protrusions in the circumferential direction.

The cooling apparatus uses oil to cool an electric motor whose output is transmitted to a drive shaft inserted into a motor shaft via a reduction gear and a differential gear. An oil seal seals the gap between the differential case of the differential gear and the outer peripheral surface of the drive shaft. An oil passage is formed inside the drive shaft. An oil introduction hole is formed in the drive shaft on the side of the differential gear with respect to the oil seal to introduce oil from the differential gear into the in-drive-shaft oil passage. An oil outlet hole is formed in the drive shaft on the side of the electric motor with respect to the oil seal to draw oil from the in-drive-shaft oil passage to the inside of the motor shaft.

The cooling apparatus uses oil to cool an electric motor whose output is transmitted to a drive shaft inserted into a motor shaft via a reduction gear and a differential gear. An oil seal seals the gap between the differential case of the differential gear and the outer peripheral surface of the drive shaft. An oil passage is formed inside the drive shaft. An oil introduction hole is formed in the drive shaft on the side of the differential gear with respect to the oil seal to introduce oil from the differential gear into the in-drive-shaft oil passage. An oil outlet hole is formed in the drive shaft on the side of the electric motor with respect to the oil seal to draw oil from the in-drive-shaft oil passage to the inside of the motor shaft.

Embodiments of the present disclosure relate to a motor and an industrial robot. The motor comprises a main body, an inner end cover, an outer end cover, a first oil seal, a second oil seal and an oil leakage sensor. The main body comprises a rotor extending along an axial direction. The inner end cover is coupled to the main body and comprises a first hole for the rotor to pass through. The outer end cover is arranged outside the inner end cover along the axial direction and abuts against the inner end cover. The outer end cover comprises a second hole for the rotor to pass through, wherein a first oil seal is arranged adjacent to the second hole and a second oil seal is arranged inside the first oil seal and is adjacent to the second hole. A gap is provided between the first oil seal and the second oil seal along the axial direction. The oil leakage sensor is provided in a through hole penetrating the outer end cover along the axial direction and is configured to detect the amount of oil or grease flowing to the oil leakage sensor via the first oil seal. The motor according to the present disclosure is characterized in dual sealing and an automatic oil leakage detection, thereby improving the motor sealing reliability and the digitalization of the motor oil leakage detection.

An electric power tool includes a holder, a motor, and a transmission mechanism. The motor includes a stator and a rotor. The rotor includes a rotary shaft and a rotor body. The rotary shaft is coupled to the transmission mechanism. The rotator includes at least the rotor body. The rotator rotates. The electric power tool further includes an absorbing member. The absorbing member has a property to absorb a lubricant. The absorbing member is arranged between the rotator and the transmission mechanism.

Systems and methods for electric motor, where the stator core has one or more stator core sections, each of which is a single-piece unit formed of soft magnetic composite (SMC) material, and where the stator core sections are positioned end-to-end with seals at each end to form a plurality of stator slots, where each of the stator slots extends through each of the stator core sections and is in fluid communication with the others to form a sealed stator chamber. The sealed stator chamber may have an expansion chamber to allow expansion and contraction of dielectric fluid in the stator chamber while maintaining separation of the dielectric oil from lubricating oil which is within the motor but external to the stator chamber. The sealed stator chamber can prevent well fluids that leak into the motor from reaching the stator windings and degrading their insulation.