Abstract: A system includes a stator core, which includes a plurality of teeth and a plurality of bridges. The plurality of teeth are disposed about an axis of the stator core, wherein each tooth of the plurality of teeth extends in a radial direction from a proximal end to a distal end. Each bridge of the plurality of bridges is disposed between two adjacent teeth and connects the proximal ends of the two teeth. The plurality of teeth and the plurality of bridges define a plurality slots, each having a proximal end and a distal end, wherein the proximal end of each slot is closed and the distal end of each slot is open.

Abstract: An electric machine is presented. The electric machine includes a stator. The electric machine further includes rotor disposed adjacent to the stator. The rotor includes a rotor core, a plurality of permanent magnets disposed in contact with the rotor core, a plurality of permanent magnets disposed in contact with the rotor core to modulate torque exerted on the rotor.

Abstract: A method includes fabricating a core, wherein the core comprises a chemically soluble first polymer, forming a body around the core, wherein the body comprises a second polymer, and etching away the core to reveal a cooling channel extending through the body.

Abstract: An AC electric machine that includes a dual magnetic phase material ring is disclosed. The AC electric machine includes a stator assembly and a rotor assembly positioned within the stator assembly and configured to rotate relative thereto, the rotor assembly comprising a rotor core including a stack of rotor laminations that collectively form the rotor core, the rotor core including a plurality of rotor poles separated by gaps therebetween. The AC electric machine also includes a dual magnetic phase material ring positioned about the stack of rotor laminations, the dual magnetic phase material ring comprising a first ring portion comprising a magnetic portion and a second ring portion comprising a non-magnetic portion.

Abstract: An electric machine is presented. The electric machine includes a stator and a rotor disposed concentric to the stator. At least one of the rotor and the stator includes a core including a plurality of laminates stacked along the axial direction of the electric machine, where the stacked plurality of laminates defines a plurality of axial slots. The at least one of the rotor and the stator further includes a permanent magnet assembly disposed in one or more of the plurality of axial slots, where the permanent magnet assembly includes two or more permanent magnets disposed serially along the axial direction of the electric machine such that adjacently disposed permanent magnets overlap one another to form an overlapped interface. The overlapped interface spans at least two laminates of the plurality of laminates of the core.

Abstract: According to various embodiments, a synchronous reluctance machine is disclosed. The synchronous reluctance machine includes a stator, a synchronous reluctance rotor disposed within the stator and configured to rotate relative to the stator, and a non-magnetic sleeve disposed circumferentially around the rotor, where sleeve thickness is between about 1 mm and 2 mm and an air-gap radius is between about 80 mm and 100 mm.

Abstract: A magnetic component including first and second regions, and a method of varying the magnetization values in different regions of the magnetic component are disclosed. The first and the second regions are characterized by a nitrogen content that is different from each other. At least one of the first region and the second region is partially-magnetic and has a nitrogen content in a range from about 0.1 weight % to about 0.4 weight % of that region. A concentration of carbon, if present, of both the first and second regions is less than about 0.05 weight % of the respective regions.

Abstract: A magnetic component including at least one region is disclosed. The at least one region includes nitrogen and a concentration of the nitrogen in the at least one region is graded across a dimension of the at least one region. Further, a saturation magnetization in the at least one region is graded across the dimension of the at least one region. Further, a method of varying the magnetization values in at least one region of the magnetic component is disclosed.

Abstract: A method includes fabricating a core, wherein the core comprises a chemically soluble first polymer, forming a body around the core, wherein the body comprises a second polymer, and etching away the core to reveal a cooling channel extending through the body.

Abstract: An AC electric machine that includes a dual magnetic phase material ring is disclosed. The AC electric machine includes a stator assembly and a rotor assembly positioned within the stator assembly and configured to rotate relative thereto, the rotor assembly comprising a rotor core including a stack of rotor laminations that collectively form the rotor core, the rotor core including a plurality of rotor poles separated by gaps therebetween. The AC electric machine also includes a dual magnetic phase material ring positioned about the stack of rotor laminations, the dual magnetic phase material ring comprising a first ring portion comprising a magnetic portion and a second ring portion comprising a non-magnetic portion.

Abstract: An electric machine is presented. The electric machine includes a stator. The electric machine further includes rotor disposed adjacent to the stator. The rotor includes a rotor core, a plurality of permanent magnets disposed in contact with the rotor core, a plurality of permanent magnets disposed in contact with the rotor core to modulate torque exerted on the rotor.

Abstract: A permanent magnet (PM) machine includes a rotor and a stator assembly. The rotor includes a plurality of permanent magnets disposed about an axis of rotation. The stator assembly includes a stator body, a plurality of coil sides and a plurality of sintered iron magnetic wedges. The stator body includes a plurality of stator teeth defining a plurality of stator slots, each stator slot having an inside position and an outside position, such that each of the plurality of stator slots includes a first plurality of inside positions, and a first plurality of outside positions. The first plurality of coil sides are disposed in each of the first plurality of inside positions and the first plurality of outside positions. The first plurality of coil sides correspond to a first power phase. The first plurality of coil sides are electrically coupled to one another by a first plurality of end-coils.

Abstract: A system and method for heating ferrite permanent magnets in an electrical machine is disclosed. The permanent magnet machine includes a stator assembly and a rotor assembly, with a plurality of ferrite permanent magnets disposed within the stator assembly or the rotor assembly to generate a magnetic field that interacts with a stator magnetic field to produce a torque. A controller of the electrical machine is programmed to cause a primary field current to be applied to the stator windings to generate the stator magnetic field, so as to cause the rotor assembly to rotate relative to the stator assembly. The controller is further programmed to cause a secondary current to be applied to the stator windings to selectively generate a secondary magnetic field, the secondary magnetic field inducing eddy currents in at least one of the stator assembly and the rotor assembly to heat the ferrite permanent magnets.

Abstract: An electric machine that includes a rotor core made of magnetic steel; a stator configured with stationary windings therein; openings disposed within or on the rotor core; and a rotor circuit that is configured to introduce saliency based on an orientation of part of the rotor circuit in relationship to a pole location of the electric machine, where the rotor circuit is made of a conductive, non-magnetic material. A rotor component and various embodiments of electric machines are also disclosed. The present invention has been described in terms of specific embodiment(s), and it is recognized that equivalents, alternatives, and modifications, aside from those expressly stated, are possible and within the scope of the appending claims.

Abstract: An electric machine is presented. The electric machine includes a stator and a rotor disposed concentric to the stator. At least one of the rotor and the stator includes a core including a plurality of laminates stacked along the axial direction of the electric machine, where the stacked plurality of laminates defines a plurality of axial slots. The at least one of the rotor and the stator further includes a permanent magnet assembly disposed in one or more of the plurality of axial slots, where the permanent magnet assembly includes two or more permanent magnets disposed serially along the axial direction of the electric machine such that adjacently disposed permanent magnets overlap one another to form an overlapped interface. The overlapped interface spans at least two laminates of the plurality of laminates of the core.

Abstract: A rotor component that comprises a rotor circuit configured for use with either an interior permanent magnet (IPM) machine or a synchronous reluctance machine (SRM) that includes a pole circuit made of a conductive, non-magnetic material and has a midpoint that substantially aligns with a d-axis of the IPM or SRM. An electric machine with a similar rotor component therein or having a loop or ring of a conductive, non-magnetic material that is substantially concentric about a d-axis of the electric machine.

Abstract: According to some embodiments, a synchronous reluctance machine is disclosed. The machine includes a stator; a rotor disposed within the stator and configured to rotate relative to the stator; and a sleeve disposed circumferentially around the rotor.

Abstract: A system and method for heating ferrite permanent magnets in an electrical machine is disclosed. The permanent magnet machine includes a stator assembly and a rotor assembly, with a plurality of ferrite permanent magnets disposed within the stator assembly or the rotor assembly to generate a magnetic field that interacts with a stator magnetic field to produce a torque. A controller of the electrical machine is programmed to cause a primary field current to be applied to the stator windings to generate the stator magnetic field, so as to cause the rotor assembly to rotate relative to the stator assembly. The controller is further programmed to cause a secondary current to be applied to the stator windings to selectively generate a secondary magnetic field, the secondary magnetic field inducing eddy currents in at least one of the stator assembly and the rotor assembly to heat the ferrite permanent magnets.

Abstract: An electric machine, such as an Internal Permanent magnet or Synchronous Reluctance machine, having X phases, that includes a stator assembly, having M slots, with a stator core and stator teeth, that is further configured with stator windings to generate a stator magnetic field when excited with alternating currents and extends along a longitudinal axis with an inner surface that defines a cavity; and a rotor assembly, having N poles, disposed within the cavity which is configured to rotate about the longitudinal axis, wherein the rotor assembly includes a shaft, a rotor core located circumferentially around the shaft. The machine is configured such that a value k=M/(X*N) wherein k is a non-integer greater than about 1.3. The electric machine may alternatively, or additionally, include a non-uniformed gap between the exterior surface of the rotor spokes and the interior stator surface of the stator.

Abstract: A system and method for heating ferrite permanent magnets in an electrical machine is disclosed. The permanent magnet machine includes a stator assembly and a rotor assembly, with a plurality of ferrite permanent magnets disposed within the stator assembly or the rotor assembly to generate a magnetic field that interacts with a stator magnetic field to produce a torque. A controller of the electrical machine is programmed to cause a primary field current to be applied to the stator windings to generate the stator magnetic field, so as to cause the rotor assembly to rotate relative to the stator assembly. The controller is further programmed to cause a secondary current to be applied to the stator windings to selectively generate a secondary magnetic field, the secondary magnetic field inducing eddy currents in at least one of the stator assembly and the rotor assembly to heat the ferrite permanent magnets.