An electric work machine includes a first brushless motor including a first stator and a first rotor combined with the first stator, and a controller. The first stator includes a first stator core and multiple first coils wound around multiple teeth on the stator core. The controller magnetizes the teeth to cause the first rotor to rotate about a rotation axis. In a plane orthogonal to the rotation axis, the first stator core has the same shape as a second stator core in a second stator used in a second brushless motor in another electric work machine. The first rotor can be combined with the second stator. The first rotor has a different number of poles from a second rotor used in the second brushless motor.

An electric work machine includes a first brushless motor including a first stator and a first rotor combined with the first stator, and a controller. The first stator includes a first stator core and multiple first coils wound around multiple teeth on the stator core. The controller magnetizes the teeth to cause the first rotor to rotate about a rotation axis. In a plane orthogonal to the rotation axis, the first stator core has the same shape as a second stator core in a second stator used in a second brushless motor in another electric work machine. The first rotor can be combined with the second stator. The first rotor has a different number of poles from a second rotor used in the second brushless motor.

An electric motor is provided including a rotor and an outer member that is coaxially placed around the inner member and having radially oriented teeth. The teeth have end parts with a width Wt, adjacent teeth being separated by a slot of slot width Wg. A number of barrier members are provided in the inner member near the inner perimeter, each barrier member having a width Wb that generally corresponds to the width Wt and having curved side sections at each end of the central section having a width that generally corresponds with the slot width Wg. The barrier members reduce electromagnetic NVH by preventing magnetic flux from passing from the slots on each side of the teeth, into the inner member.

A rotor core includes a magnet pocket defined by the rotor core and extending longitudinally in an axial direction of the rotor core. The rotor core also includes a magnet structure disposed within the magnet pocket and extending transversely in a radial direction and/or circumferential direction of the rotor core to define a magnet width, the magnet structure extending longitudinally in the axial direction of the rotor core, wherein the magnet structure has a varied axial length.

An interior permanent magnet (IPM) electric machine has an improved rotor configuration to manage mechanical stresses induced by electro-magnetic force acting upon permanent magnets housed therein. This includes providing magnet cavities in the rotor with sufficient clearances in the corners wherein a portion of a slot corner is formed with certain curvature shapes using a novel geometry. By doing this, more surface area is obtained to evenly distribute stress that is induced by centrifugal force acting upon the rotor during rotation, thus reducing the stress concentration. Furthermore, an expanded space is achieved between the magnet corner and the rotor lamination, thus providing robust packaging and dynamic support of the permanent magnets in the magnet cavities. Furthermore, the expanded space provides improved clearance for ease of manufacturing and assembly.

An interior permanent magnet (IPM) electric machine has an improved rotor configuration to manage mechanical stresses induced by electro-magnetic force acting upon permanent magnets housed therein. This includes providing magnet cavities in the rotor with sufficient clearances in the corners wherein a portion of a slot corner is formed with certain curvature shapes using a novel geometry. By doing this, more surface area is obtained to evenly distribute stress that is induced by centrifugal force acting upon the rotor during rotation, thus reducing the stress concentration. Furthermore, an expanded space is achieved between the magnet corner and the rotor lamination, thus providing robust packaging and dynamic support of the permanent magnets in the magnet cavities. Furthermore, the expanded space provides improved clearance for ease of manufacturing and assembly.

A rotor structure, a permanent magnet auxiliary synchronous reluctance motor and an electric vehicle, the rotor structure includes a rotor body and an outer layer permanent magnet. The rotor body is provided with a magnetic steel slot group. The magnetic steel slot group includes an outer layer magnetic steel slot. The outer layer magnetic steel slot includes a plurality of magnetic steel slot segments. At least two of the plurality of magnetic steel slot segments are arranged in a radial direction of the rotor body and are disposed oppositely at both sides of a direct axis of the rotor body. The outer layer permanent magnet is arranged in the magnetic steel slot segment, a length of the outer permanent magnet disposed in the two oppositely arranged magnetic steel slot segments is L, and a maximum distance between the two oppositely arranged magnetic steel slot segments is C, where 0.8×C≤L.

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.

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.

The present invention relates to rotary devices, such as an electric motors and power generators, having dual and multiple air gaps. Disclosed is a rotary device characterized by comprising a rotor part, a stator part, an inner support part, and a housing part. The inner support part is coupled and fixed to the housing part. The stator part includes: an inner stator part which includes an inner iron core coupled and fixed to the inner support part, and an inner wire wound on the inner iron core; and an outer stator part which includes an outer iron core coupled and fixed to the inner circumferential surface of the housing part, and an outer wire wound on the outer iron core. The rotor part includes: a rotor-side magnetic force application part which has, on the inner circumferential side, the inner stator part and an inner air gap, and has, on the outer circumferential side, the outer stator part and an outer air gap; and a pair of end support parts installed at respective ends of the rotor-side magnetic force application part. At least one among the pair of end support parts is coupled and fixed to a rotary shaft which is rotatably installed in the housing part.