A motor for an electric power steering device, includes: a housing side bearing which is placed on the output side of a shaft of a rotor placed in a frame, and is supported by a housing connected to the frame; and a frame side bearing which is placed on the opposite output side of the shaft of the rotor, and is composed of an outer ring and an inner ring supported by the frame. The motor is controlled by an electronic control unit which is coaxially placed with the rotor, the motor including: a bearing box which supports the frame side bearing, and is formed with a closed end section between the closed end section and the side of the frame side bearing; an axial elastic body which is placed on the closed end section of the bearing box, and applies a preload in an axial direction to the outer ring of the frame side bearing; and a radial elastic body which is placed on the outer circumferential side of the outer ring of the frame side bearing, and applies a preload in a direction perpendicular to the axial direction.

Motor for electric power steering device

A method and device for using magnetostriction to generate electricity from fluid motion. The device includes a first structural component, an outer housing, and a strain structure. The outer housing substantially circumscribes the first structural component and at least partially defines an annular space between the first structural component and the outer housing. The strain structure is coupled within the annular space between the first structural component and the outer housing. The strain structure experiences a change in physical strain imposed by a bearing in response to a relative movement between the bearing and the strain structure. The strain structure includes a magnetostrictive material to generate a magnetic field in response to the change in the physical strain.

Method and device for energy generation

The invention relates to an axial fan motor comprising: a fan (100) having a rotating shaft (2) and composed of a hub (9) and a plurality of vanes (121) provided around the hub, the fan rotating to generate an air flow; a stator substrate set comprising a stator core (5), which drives the fan, an insulator (41, 42), and a substrate (6); and a venturi (8) having a sleeve (1), into an inner peripheral side of which a bearing (101, 102) is inserted to support the rotating shaft and to an outer peripheral side of which the stator core is fixed, the venturi being formed on one side thereof with an air suction opening and on the other side thereof with an air discharge mouth, wherein a space (1a) is provided between the stator core (5) and the sleeve (1).

Axial fan motor

A brushless rotary actuator comprises a housing including a base defining a cavity for a motor assembly and a cover defining a cavity for a gear assembly. A circuit board assembly is seated in the housing between the motor assembly and the gear assembly. A rotor shaft extends through an aperture in the circuit board assembly and is coupled to the gear assembly. An output shaft is coupled to the gear assembly and extends through the cover. In one embodiment, a bearing and a bearing retainer are mounted on a sleeve formed in the base for retaining the rotor in the housing. In another embodiment, a rotor retention pin with a proximal head abutting against the top of the rotor and a distal threaded or barbed end extends into the sleeve of the housing for retaining the rotor in the housing.

Brushless direct current actuator

The embodiments of the utility model provide a motor and a holder device The motor comprises a rotor, a spindle assembly, a stator seat, and a stator which is fixed on the stator seat The stator seat is fixedly arranged on a first connection element The spindle assembly comprises a spindle, a bearing, and a fastening portion One end of the spindle is fixed on a second connection element The bearing sleeves the spindle The other end of the spindle is fixed on the inner ring of the bearing The outer ring of the bearing is fixed on the stator seat The inner ring of the bearing can be rolled relative to the outer ring The fastening portion comprises a gasket and an elastic element sleeving the spindle separately One side of the gasket is pressed against the inner ring of the bearing One end of the elastic element is pressed against the other side of the gasket The other end of the elastic element is pressed against a contact element which is arranged in the shell of the rotor and be in contact with the spindle By adopting the motor and the holder device of the utility model, the bearing clearance can be better eliminated, advantages of easy operation and low cost can be realized, the pre-tightening success rate and production efficiency can be greatly improved, and the rotation accuracy and service life of the motor can be improved

Motor and holder device

A method of rapidly assembling the rotor ( 22 ) of an external-rotor motor ( 20 ) onto a bearing support tube ( 70 ) and in a predetermined axial position relative to the latter, which rotor ( 22 ) comprises a rotor cup ( 24 ) and a rotor shaft ( 28 ), includes the following steps: a) beginning at the rotor cup ( 24 ), pre-mounting, onto the rotor shaft ( 28 ), a compression spring ( 48 ), a retaining washer ( 50 ), and a bearing arrangement having a plurality of rolling bearings ( 52, 60 ), the inner rings ( 56, 64 ) of the rolling bearings being slidingly displaceable on the rotor shaft ( 28 ) within a predetermined region; b) pressing the rotor ( 24 ), with the elements mounted thereon, into the bearing support tube ( 70 ) by means of a pressing-in force (K), the compression spring ( 48 ) being compressed so that the rotor cup presses the retaining washer ( 50 ) into the bearing support tube ( 70 ); and c) removing the pressing-in force (K) so that the rotor shaft ( 28 ) is displaced by means of the compression spring ( 48 ) within the inner rings ( 56, 64 ) of the bearings ( 52, 60 ) in such a way that the rotor ( 24 ) assumes the predetermined axial position relative to the bearing support tube ( 70 ). The method is advantageous because the steps are simple enough to be automated, and the structure is advantageous because the closed bearing tube prevents dirt and contaminants from getting into the bearings, thereby extending service life.

External rotor motor and method for assembling such a motor

An external rotor motor, suitable for driving a cooling fan, has a structure which facilitates automated assembly with proper angular registration. The rotor has a central shaft which is rotatably supported inside a bearing support tube having a tapered outer surface formed with a circumferential stop and longitudinal guide grooves. An inner stator structure is located radially between the bearing support tube and the rotor. The stator has an internal recess containing a securing ring or disk with inwardly extending tabs. During assembly of the inner stator onto the bearing support tube, the tabs slide in the guide grooves, then bend to form barbs which engage into the outer surface of the bearing support tube, thereby securing the stator on the bearing support tube in a predefined angular orientation. The circumferential stop assures insertion of the bearing support tube to the correct depth.

External rotor motor

An apparatus may include a heat exchanger and an equalizing vessel for equalizing changes in coolant volume. The heat exchanger may include an inflow for delivering coolant to the heat exchanger and an outflow for discharging coolant from the heat exchanger. The equalizing vessel may be closed off by a flexible membrane that follows changes in volume of the coolant. The equalizing vessel may include a first chamber that is in liquid communication with the inflow of the heat exchanger and a second chamber that is in liquid communication with the outflow of the heat exchanger. A filter may also be provided to filter the coolant.

Apparatus including a heat exchanger and equalizing vessel

The external rotor motor includes an inside stator with a laminated core (23) and a recess (36). A bearing carrier tube carries the outside rotor on its inside and the inside stator on its outside. A safety disk (20) is provided in the coating of the laminated core and protrudes into the recess of the inside stator with sections (34) of its inside circumference (48). The safety ring engages into the outside of the bearing carrier tube with these sections. An independent claim is included for a small sized fan using the motor.

External rotor motor for fan e.g. for cooling computer processors, has bearing carrier tube carrying outside rotor on its inside and inside stator on its outside and safety disk protruding into recess of inside stator

Francisco Rojo Lulic

Papers

External rotor motor and method for assembling such a motor

External rotor motor

Apparatus including a heat exchanger and equalizing vessel

External rotor motor for fan e.g. for cooling computer processors, has bearing carrier tube carrying outside rotor on its inside and inside stator on its outside and safety disk protruding into recess of inside stator