Abstract: A rotor for an electric machine includes a core comprised of stacked laminations that define pockets between a hub portion and a pole portion. Each of the pockets are configured to receive magnetic material and define center cavities between regions of magnetic material to eliminate a flux leakage path between the magnetic materials. A cured mixture including an epoxy and a magnetic powder is disposed within the center cavities. The magnetic material may include sintered magnets and a cured mixture.

Abstract: A rotor for a bearingless induction motor is provided. A rotor core defines rotor slots. A rotor winding includes a common connector plate, a plurality of rotor connector plates, and a slot conductor mounted within each rotor slot. The common connector plate is mounted adjacent a first end of the rotor core. The plurality of rotor connector plates is mounted adjacent a second end of the rotor core. Each slot conductor is electrically connected to the common connector plate and to one rotor connector plate of the plurality of rotor connector plates. Each rotor connector plate of the plurality of rotor connector plates is configured to connect a group of slot conductors that includes at least two slot conductors. A number of slot conductors included in the group of slot conductors is defined based on a predefined number of suspension pole pairs selected to provide a radial suspension force.

Abstract: Methods and systems are provided for a cooling jacket for an electric motor. In one example, a system may include a channel extending along a circumference of an inner surface of the cooling jacket between an inlet and an outlet of the cooling jacket. A cross-section of the channel may gradually change from the inlet to the outlet along the circumference in order to compensate an increase in coolant temperature by an increase in convective heat transfer such that cooling is balanced around a circumferential surface of the electric motor.

Abstract: In an electric power steering device, a motor housing includes an end face part opposite to an output part of a rotating shaft of an electric motor. A power conversion circuit part includes a power conversion switching circuit part, and a second part exclusive of the power conversion switching circuit part. The power conversion switching circuit part includes an upper arm switching element and a lower arm switching element packaged by synthetic resin, and is mounted on a power conversion switching circuit board that is mounted to a power conversion switching circuit part heat dissipation section of the end face part for heat dissipation. A power supply circuit part and the second part of the power conversion circuit part are mounted on a power supply circuit board that is mounted to a power supply circuit part heat dissipation section of the end face part for heat dissipation.

Abstract: A rotor assembly for a permanent magnet motor includes a rotor stack of laminated ferromagnetic layers and partial end plates at opposite axial ends of the rotor stack wherein each axial end of the rotor bears two partial end plates, each of which covers a partial circle and does not axially overlap with the other one of the partial end plates at the same axial end. The two partial end plates of each axial end are formed by a first axial end plate shaped as a first partial ring disc and a second partial end plate shaped as a second partial ring disc that are made of stamped metal and that are of different mass.

Abstract: A motor and a spoke-type rotor structure thereof are disclosed. The rotor structure comprises a rotor core which has a plurality of spoke-type first magnetic members. Two oblique second magnetic members arranged in a V shape are provided between every adjacent two of the first magnetic members. A radius of the rotor core is R. A length of the first magnetic member is ls. A length of the second magnetic member is lv. A length component of the second magnetic member on the radius of the rotor core is x. An included angle between the first magnetic member and the second magnetic member is ?. An included angle between every adjacent two of the first magnetic members is ?. The parameters satisfy: ls+x<R, wherein x=lv·cos(180°??); 90°+?/2<?<180°.

Abstract: An endoscope apparatus has an endoscope and a video processor. The endoscope has a magnet and a coil, the magnet has a voice coil motor configured to be movable with respect to the coil and a Hall device disposed in the vicinity of the coil and configured to detect a magnetic field of the magnet in order to detect a position of the magnet. The video processor includes a position detection circuit configured to detect the position of the magnet from an outputted signal of the Hall device, an arithmetic operation section configured to correct a sensor output signal indicating the position of the magnet detected by the position detection circuit using correction information and output the sensor output signal, and a drive control circuit configured to control a current or a voltage to the coil based on an arithmetic operation result of the arithmetic operation section.

Abstract: Methods and systems for cooling an electric motor are provided. An electric motor cooling system, in one example, includes a stator with a first end winding on a first axial side, potting material at least partially enclosing the first end winding, and a plurality of coolant passages adjacent to the stator, where at least a portion of the plurality of coolant passages are adjacent to the potting material. The electric motor cooling system also includes a coolant passage housing including a plurality of fins defining a portion of the boundaries of the plurality of coolant passages and in face sharing contact with an outer surface of the stator.

Abstract: A low height type actuator capable of performing a two-dimensional motion includes a magnet structure that includes a first array in which the first and second magnets are alternately arranged in x-direction and a second array in which the first and second magnets are alternately arranged in y-direction, and first and second wirings. The first wiring crosses the first magnets included in the first array in y-direction, and the second wiring crosses the first magnets included in the second array in x-direction. According to the present invention, by making current flow in the first and second wirings, a two-dimensional motion can be achieved. Further, since the first and second wirings are each a planar wiring that crosses the magnets, height reduction can be achieved.

Abstract: Electrical generators having one or more conformal support and cooling devices for use in supporting and cooling rotating elements of the generator are disclosed herein. An electrical generator includes a housing, a shaft disposed axially through the housing, a rotor assembly including a plurality of poles that are disposed within the housing and mounted on the shaft, a support wedge disposed between two of the plurality of poles. The conformal support and cooling device includes an internal cooling channel in a helical configuration or a V-shape configuration that extends from a first length-wise end of the support and cooling device to a second length-wise end of the support and cooling device. Additive manufacturing processes are employed to fabricate the conformal support and cooling device.

Abstract: An induction motor includes a stator and a rotor. The stator is configured to generate a rotating magnetic field. The rotor is disposed inside the stator, separated from the stator by an air gap, and is configured to rotate around an axis in response to the rotating magnetic field. The rotor includes a rotor core, multiple end rings, and multiple collars. The end rings are attached at opposite ends of the rotor core. Each end ring has one of multiple regions disposed outside the air gap. Each region has an outer surface. The collars are attached in a prestressed condition around the outer surface of each region. The prestressed condition is configured to maintain a compressive stress in the end rings at a maximum-designed rotational speed of the rotor.

Abstract: A rotor includes a rotor core. A permanent magnet constitutes a first magnetic pole, and a part of the rotor core constitutes a second magnetic pole. In the second magnetic pole, a plurality of slits is symmetrically formed with respect to a magnetic pole center line connecting a pole center of the second magnetic pole and the center axis. On one side of the magnetic pole center line in a circumferential direction about the center axis, the plurality of slits has a first slit closest to the magnetic pole center line and a second slit adjacent to the first slit in the circumferential direction. A minimum distance L1 from the first slit to the outer circumference of the rotor core and a minimum distance L2 from the second slit to the outer circumference of the rotor core satisfy L1<L2.

Abstract: Examples include an actuator that includes a rotor that includes a permanent magnet; a stator that at least partially surrounds the rotor; a plurality of electromagnets coupled to the stator that are configured to apply magnetic force to the permanent magnet to rotate the rotor; a first lock that (i) has a first mechanical bias to engage the rotor and prevent rotation of the rotor when the rotor is in a home position and (ii) is configured to disengage the rotor against the first mechanical bias while receiving a first control signal; and a second lock that (i) has a second mechanical bias to disengage the rotor and (ii) is configured to engage the rotor against the second mechanical bias to prevent rotation of the rotor while receiving a second control signal.

Abstract: A heat-dissipation frame assembly includes a motor frame, an air-guide shield and an airflow-driving device. The motor frame includes a main frame and annular heat-dissipation fins. Each of the annular heat-dissipation fins has an outer edge, and an average radial distance is defined between the outer edge and the central axis. The average radial distances of the annular heat-dissipation fins are decreased gradually in the longitudinal direction from the first end portion to the second end portion, and an external annular channel is formed between any neighboring two annular heat-dissipation fins. The airflow-driving device, disposed at the second end portion of the main frame, is used for generating at least one heat-dissipating airflow. The air-guide shield, connected with the motor frame, surrounds and covers the plurality of annular heat-dissipation fins, such that the at least one heat-dissipating airflow is guided into the plurality of external annular channels.

Abstract: A method for producing a stator may include providing an annular stator body including a plurality of stator teeth arranged spaced apart from one another. The method may also include at least partially overmoulding at least two adjacent stator teeth with a first plastic mass. The method may further include arranging at least one stator winding on at least one stator tooth of the at least two stator teeth and fixing the at least one stator winding on the at least one stator tooth via at least partially overmoulding the at least one stator winding with a second plastic mass. The method may additionally include, prior to fixing the at least one stator winding, introducing a mask into an intermediate space defined between the at least two stator teeth to cover a surface portion of the stator body bounding the intermediate space radially outside.

Abstract: A nozzle of a cleaner includes: a housing; a rotation cleaning unit accommodated in the housing and configured to clean a surface based on a rotation operation; and a drive unit inserted into a side of the rotation cleaning unit. The drive unit includes a motor, a motor supporter fixed to the housing and coupled to the motor, a gear unit connected with a rotation shaft of the motor to transfer a driving force, and a shaft connected to the gear unit and the rotation cleaning unit to transfer a rotation force to the rotation cleaning unit. The motor includes a printed circuit board (PCB) installation portion in which a PCB is installed and which is spaced apart from the motor supporter, in which a first space portion in which the air flows is formed between the motor supporter and the PCB installation portion.

Abstract: A cylindrically-shaped motor shaft forming a rotational axis of a motor includes a processing target region, a spiral groove, and a reverse spiral groove intersecting with the spiral groove at at least one point. The processing target region has a first end closer to a bottom face of the cylindrical shape and second end closer to a top face side of the cylindrical shape. At least one turn of the spiral groove surrounds an outer circumferential surface in the processing target region. The reverse spiral groove surrounds the outer circumferential surface in the processing target region in a direction reverse to that of the spiral groove.