Abstract: A permanent magnet motor comprises: a stator comprising teeth; and a rotor rotatable relative to the stator, the rotor having a plurality of poles, wherein each pole of the rotor comprises a pair of magnet retention slots, each magnet retention slot accommodating a magnet. Surfaces of the teeth of the stator facing the rotor are flat or have an arc shape. Each magnet retention slot may have a plurality of angled slot surfaces forming a first barrier around a corner of the magnet positioned closest to an outer surface of the rotor. At least three second barriers are positioned around a mid-axis extending along between the pair of the magnet retention slots. Each magnet retention slot comprises a slot surface slanted or curved relative to a second side surface of the magnet facing an inner surface of the rotor to form a third barrier around an end of the second side surface of the magnet.

Abstract: Position sensors, including linear position sensors, that utilize magnetic field(s) are disclosed. Disclosed sensors include flux emitters and sensor assemblies. The sensor assemblies include flux collectors that interact with magnetic fields from flux emitters and with a magnetism sensing device. Flux emitters have arrangements of magnets that when combined with the sensor assembly can provide a constantly increasing or a constantly decreasing signal across a range of relative movement.

Abstract: An actuator assembly comprises: a rotatable shaft, a magnet mounted to the rotatable shaft, non-magnet material positioned between the magnet and the shaft, a rotary sensor configured to be responsive to rotation of the magnet for generating a signal, and a housing comprising a magnetic shield surrounding at least a part of the rotary sensor and at least a part of the magnet mounted to the shaft to shield the sensor and the magnet from an external magnetic field. The actuator assembly further comprises a magnet holder fixing the magnet to the shaft. The magnetic shield encompasses the magnetic flux from the magnet to the rotary sensor and also shields the rotary sensor from any external magnetic field such as stray field or magnetic field from the outside of the housing. The non-magnetic material may reduce leakage magnetic flux from the magnet to the shaft.

Abstract: A rotor assembly of a motor is configured to be rotatable relative to a stator. The rotor assembly may comprise a permanent magnet rotor segment comprising permanent magnets, the permanent magnet rotor segment configured to be rotatable by a magnetic field generated by the permanent magnets; and a reluctance rotor segment comprising a plurality of flux barriers, the reluctance rotor segment configured to be rotatable by magnetic reluctance formed by the flux barriers. The permanent magnet rotor segment and the reluctance rotor segment may be axially stacked relative to each other so that at least a part of a first torque ripple generated by the permanent magnet rotor segment and at least a part of a second torque ripple generated by the reluctance rotor segment can cancel each other. The permanent magnet rotor segment may be a rare earth permanent magnet rotor, and the reluctance rotor segment may be a synchronous reluctance rotor.

Abstract: A permanent magnet motor comprises: a stator comprising teeth; and a rotor rotatable relative to the stator, the rotor having a plurality of poles, wherein each pole of the rotor comprises a pair of magnet retention slots, each magnet retention slot accommodating a magnet. Surfaces of the teeth of the stator facing the rotor are flat or have an arc shape. Each magnet retention slot may have a plurality of angled slot surfaces forming a first barrier around a corner of the magnet positioned closest to an outer surface of the rotor. At least three second barriers are positioned around a mid-axis extending along between the pair of the magnet retention slots. Each magnet retention slot comprises a slot surface slanted or curved relative to a second side surface of the magnet facing an inner surface of the rotor to form a third barrier around an end of the second side surface of the magnet.

Abstract: Position sensors, including linear position sensors, that utilize magnetic field(s) are disclosed. Disclosed sensors include flux emitters and sensor assemblys. The sensor assemblys include flux collectors that interact with magnetic fields from flux emitters and with a magnetism sensing device. Flux emitters have arrangements of magnets that when combined with the sensor assembly can provide a constantly increasing or a constantly decreasing signal across a range of relative movement.

Abstract: Position sensors, including linear position sensors, that utilize magnetic field(s) are disclosed. Disclosed sensors include flux emitters and sensor assemblys. The sensor assemblys include flux collectors that interact with magnetic fields from flux emitters and with a magnetism sensing device. Flux emitters have arrangements of magnets that when combined with the sensor assembly can provide a constantly increasing or a constantly decreasing signal across a range of relative movement.

Abstract: Position sensors, including linear position sensors, that utilize magnetic field(s) are disclosed. Disclosed sensors include flux emitters and sensor assemblies. The sensor assemblies include flux collectors that interact with magnetic fields from flux emitters and with a magnetism sensing device. Flux emitters have arrangements of magnets that when combined with the sensor assembly can provide a constantly increasing or a constantly decreasing signal across a range of relative movement.

Abstract: A permanent magnet motor (and associated rotor and stator) are described. The motor includes: a rotor having: an outer surface disposed radially from a central axis; and a plurality of permanent magnets located on the outer surface of or within pockets located between the outer surface and the central axis of the rotor; a stator having an inner surface in a spaced apart relationship to the outer surface or the plurality of permanent magnets with a gap there between that varies as a function of axial position along the central axis, and a first gap width at a first axial position is different from a second gap width at a second axial position, and the first and second gap widths are sized and configured to reduce the coping torque of the IPM motor as compared to an IPM motor having a constant gap width of the first or second width.

Abstract: A permanent magnet motor (and associated rotor and stator) are described.

Abstract: An actuator assembly comprises: a rotatable shaft, a magnet mounted to the rotatable shaft, non-magnet material positioned between the magnet and the shaft, a rotary sensor configured to be responsive to rotation of the magnet for generating a signal, and a housing comprising a magnetic shield surrounding at least a part of the rotary sensor and at least a part of the magnet mounted to the shaft to shield the sensor and the magnet from an external magnetic field. The actuator assembly further comprises a magnet holder fixing the magnet to the shaft. The magnetic shield encompasses the magnetic flux from the magnet to the rotary sensor and also shields the rotary sensor from any external magnetic field such as stray field or magnetic field from the outside of the housing. The non-magnetic material may reduce leakage magnetic flux from the magnet to the shaft.

Abstract: An electric motor with a rotor and a stator, where the rotor and/or the stator can comprise two or more sections, and a torque ripple caused by the magnetic field(s) associated with a section of the rotor (or stator) can at least partially counters torque ripple caused by the magnetic field(s) associated with other section(s) of the rotor (or stator).

Abstract: Position sensors, including linear position sensors, that utilize magnetic field(s) are disclosed. Disclosed sensors include flux emitters and sensor assemblys. The sensor assemblys include flux collectors that interact with magnetic fields from flux emitters and with a magnetism sensing device. Flux emitters have arrangements of magnets that when combined with the sensor assembly can provide a constantly increasing or a constantly decreasing signal across a range of relative movement.

Abstract: A non-contact angle/torque sensor comprises an upper rotor in an annular shape having a central axis, and in which magnets are located, the magnets positioned within the annular shape around the central axis with the north and the south poles of adjacent magnets being oriented opposite to one another, and a lower rotor in an annular shape and sharing the central axis of the upper rotor, and located spaced outwardly from an outer circumferential surface of the upper rotor. The lower rotor has upper and lower stators spaced apart along the central axis. The upper stator has upper and lower backplanes and a series of upper and lower extensions extending from the respective backplanes. The upper extensions and the lower extensions are not intermeshed or overlapped.

Abstract: According to an embodiment of the present invention, a three phase motor in which a structure for preventing an electrical short circuit is applied includes a stator including a base portion having a hollow formed therein and a plurality of winding portions extending from the base portion toward the hollow and formed apart a predetermined distance from each other; a rotor having a plurality of magnets inserted therein and disposed in the hollow apart from ends of the winding portions; and an insulation sheet disposed between the winding portions abutting each other to prevent an electrical short circuit among the coils wound around the winding portions abutting each other.

Abstract: Disclosed is a non-contact angle/torque sensor. The non-contact angle/torque sensor according to one embodiment of the present invention having an upper rotor in an annular shape having a central axis, and in which magnets are located, the magnets positioned within the annular shape around the central axis with the north and the south poles of adjacent magnets being oriented opposite to one another, and a lower rotor in an annular shape and sharing the central axis of the upper rotor, and located spaced outwardly from an outer circumferential surface of the upper rotor; the lower rotor having: upper and lower stators spaced apart along the central axis; the upper stator having: upper and lower backplanes and a series of upper and lower extensions extending from the respective backplanes, wherein the upper extensions and the lower extensions are not intermeshed or overlapped.

Abstract: According to an embodiment of the present invention, a three phase motor in which a structure for preventing an electrical short circuit is applied includes a stator including a base portion having a hollow formed therein and a plurality of winding portions extending from the base portion toward the hollow and formed apart a predetermined distance from each other; a rotor having a plurality of magnets inserted therein and disposed in the hollow apart from ends of the winding portions; and an insulation sheet disposed between the winding portions abutting each other to prevent an electrical short circuit among the coils wound around the winding portions abutting each other.