A method of mounting a rotor assembly to a frame of an electric motor. The method includes providing a rotor assembly having a bearing and a frame having a bearing seat. The bearing seat has an aperture. The bearing and/or the internal surface of the bearing seat has an annular groove. The method includes locating the bearing within the bearing seat. The method includes injecting an adhesive through the aperture into the annular groove. The method includes affecting relative movement between the bearing and the bearing seat. The method includes curing the adhesive.

A power tool including a brushless motor having a sensor circuit board has higher durability. The power tool includes a housing, a brushless motor including a rotor having a rotational shaft, a stator, and a sensor circuit board fixed to the stator and having a rotation detecting element that detects rotation of the rotor, and receiving the rotational shaft through the sensor circuit board, and a bearing held in the housing and supporting the rotational shaft. The bearing is located to overlap the rotation detecting element in an axial direction of the rotational shaft.

A power tool including a housing, a controller within the housing, and a brushless motor within the housing and controlled by the controller. The brushless motor including a stator assembly including a stator core having stator laminations with an annular portion and inwardly extending stator teeth. The stator assembly defines a stator envelope in an axial direction extending between axial ends of stator end caps of the stator assembly. The brushless motor further includes a rotor assembly including a rotor core having rotor laminations and defining a central aperture that extends in the axial direction and that receives a shaft, and a position sensor board assembly including position sensors and configured to provide position information of the rotor core to the controller. The rotor assembly and the position sensor board assembly are provided at least partially within the stator envelope.

A motor assembly includes a rolling bearing installed on a rotation shaft between an impeller and a rotor to support a first support of the rotation shaft, and a motor housing having a stator. The motor housing has a gas bearing bracket for accommodating a second support of the rotation shaft disposed at a side opposite to the first support with respect to the rotor. The motor assembly includes a gas bearing assembly in the gas bearing bracket to support rotation of the second support of the rotation shaft. The gas bearing assembly includes a gas bearing for surrounding the second support. The gas bearing is spaced apart from the second support of the rotation shaft to define a gap therebetween when the rotation shaft rotates. The gas bearing assembly includes an elastic member interposed between the gas bearing bracket and the gas bearing to elastically support the gas bearing.

A motor assembly includes a rotation shaft, an impeller installed at one side of the rotation shaft, a rotor mounted at the other side of the rotation shaft to be spaced apart from the impeller along an axial direction of the rotation shaft, a stator surrounding an outer face of the rotor such that the stator is spaced apart from the rotor along a radial direction of the rotation shaft, a first bearing installed at the one side of the rotation shaft between the impeller and the rotor, and a second bearing installed at the other side of the rotation shaft, opposite to the first bearing with respect to the rotor, and disposed to be axially closer to the other end of the rotation shaft than the rotor. An outer diameter of the first bearing is larger than an outer diameter of the second bearing.

In a motor, a wire support member includes a wire holding portion that holds one portion of coil lead wires among the coil lead wires extending upward from a coil, a first conducting member that electrically connects the other portion of the coil lead wires to each other, and a main body portion that supports the wire holding portion and a first conducting member, a bus bar unit includes a second conducting member connected to the coil lead wire held by the wire holding portion, and a bus bar holder that holds the second conducting member. A bearing holder includes a through-hole which penetrates the bearing holder in an axial direction and through which a coil end of the coil lead wire or the second conducting member passes.

An electric motor comprising: a stator assembly; a rotor assembly; and a support body. The stator assembly comprises a plurality of stator elements, and the rotor assembly comprises a shaft to which is mounted at least a first and a second bearing mounted either side of a permanent magnet. The support body comprises an elongate central part, and first and second bearing seats positioned axially at opposite ends of the elongated central part to each other, and the elongate central part defines a plurality of openings each configured to receive one of the plurality of stator elements.

An electric motor is provided comprising a rotor unit, a stator unit, a housing, and a bearing mechanism. The rotor unit rotates about a vertical center axis. The stator unit is disposed around the rotor unit. The stator unit is fixed inside of the housing. The bearing mechanism rotatably supports the rotor unit relative to the stator unit. The housing comprises a cylindrical wall portion with a bottom and a cover plate, which covers an opening of the cylindrical wall portion. The bearing mechanism further comprises at least two bearings, an upper bearing is sustained by the cover plate and a lower bearing is sustained by the bottom of the housing. The cover plate is made of electrically conductive elements and comprises at least one projection protruding toward the upper outer side of the cover plate so that the at least one projection is configured to contact, directly or indirectly, at least one grounding contact of a controller, which drives and controls the electric motor disposed on the upper outer side of the cover plate. The controller is connected to a ground potential through the cover plate and the motor housing.

An electrical machine (10) and a method for producing such a machine, with a pole pot (15), in which a stator (16) and a rotor (18) are held, and axially on the open side of the pole pot (15) a connector housing (33) with an integrated terminal connector (37) is arranged, wherein the connector housing (33) has a circumferential wall (83), which lies axially against the pole pot (15), and the circumferential wall (83) has radial windows (110), in order to make electrical contacting of electrical contacts (30) of the connector housing (33) with electrical mating contacts (133) of the stator (16) possible after the placement of the connector housing (33) onto the pole pot (15).

An electric motor includes a rotor assembly rotatable about a vertical center axis, a stator assembly around the rotor assembly, a housing inside of which the stator assembly is fixed, and a bearing mechanism rotatably supporting the rotor assembly. The housing includes a cylindrical wall portion inside of which the stator assembly is located, a bottom at a bottom vertical end of the cylindrical wall portion and extending radially outward, and a cover plate on one side of the stator assembly opposite to the bottom. The cover plate includes electrically conductive elements and at least one columnar projection protruding away from the stator assembly so that the at least one projection contacts at least one grounding contact of a controller on one side of the cover plate, the controller being electrically connected to a ground potential through the housing.