Abstract: An electric machine for powering an electric vehicle includes a rotor including rotor laminations and a first magnet. The rotor is configured to rotate relative to a stator to drive a rotor shaft and at least one drive wheel of the electric vehicle. The rotor laminations define a first slot that defines a first flux barrier, a second flux barrier and a first magnet retaining slot portion. The first flux barrier has a first flux barrier width at a first end of the first slot. The second flux barrier has a second flux barrier width at a second end of the fist slot. The first magnet retaining slot portion has a first slot width. The first magnet is positioned in the first magnet retaining slot portion. The first flux barrier width and the second flux barrier width are greater than the first slot width.

Abstract: A switched reluctance machine is described herein. The switched reluctance machine includes a rotor and a stator disposed concentrically with the rotor, the stator having stator teeth and windings wound about the teeth. The windings include, for each phase of the switched reluctance machine, a first set of coils and a second set of coils. The first set of coils includes first coils characterized by a first number of turns and the second set of coils includes second coils characterized by a second number of turns. The first number of turns is higher than the second number of turns. A motorized micro-mobility system that includes the switched reluctance machine is also described herein.

Abstract: Embodiments herein relate to a motor housing for ingress protection and a method of assembly thereof. In accordance with at least one aspect, there is provided a motor housing assembly for retaining an electric motor, comprising: a housing body portion extending along a housing axis between a first end and a second end; an end flange member coupled to the first end of the housing body, the end flange further comprising an exterior surface and an interior surface and a shaft-receiving opening extending between the exterior and interior surfaces for receiving a shaft of the electric motor, wherein the exterior surface comprising a groove surrounding the shaft-receiving opening; a sealing assembly disposed around the shaft-receiving opening of the end flange, the sealing assembly comprising: a flinger seal extending between a first and a second end, wherein the second end is receivable inside of the groove.

Abstract: A concentrated coil manufacturing apparatus for transfer to a stator tooth is provided. The apparatus may comprise a spindle and a coil transfer tool. The spindle may comprise a spindle winding machine mount and a transfer tool mount. The coil transfer tool may extend from a spindle mounting end to a distal end; and may have a coil carrier and a crown. The coil carrier may extend from the crown towards the spindle mounting end. The spindle mounting end of the coil transfer tool may be removably securable to the spindle at the transfer tool mount. When the coil transfer tool is removably secured to the spindle, the coil transfer tool and the spindle may collectively define upper and lower coil endcap mounts that are closed in that each endcap mount includes a proximal portion defined by the spindle joined to a distal portion defined by the coil transfer tool.

Abstract: The current profile of excitation current provided to the electrical coils of a switched reluctance machine is controlled to reduce acoustic noise. A plurality of potential current waveforms can be evaluated to select a desired waveform that reduces the acoustic noise level of the switched reluctance machine. A cumulative sound pressure level of the switched reluctance machine can be determined for each potential current waveform. The cumulative sound pressure level can be determined based on a plurality of harmonic sound pressure levels expected to result from the potential current waveform. A desired current waveform can be identified as the potential current waveform associated with an optimal cumulative sound pressure level. The desired current waveform can then be applied to the corresponding phase coil of the switched reluctance machine in order to operate the switched reluctance machine while reducing acoustic noise without sacrificing other motor performance metrics.

Abstract: A system for controlling pitch angle of a blade of a wind turbine is provided. The system may comprise a switched reluctance motor and an inverter. The motor may be configured to be positioned at a hub of the wind turbine and coupled to the blade. The motor may have a stator and a rotor. The stator may have: (i) multiple stator poles and (ii) coil windings around each of the multiple stator poles. The rotor may be rotatably mounted with respect to the stator. The rotor may have multiple rotor poles and a rotor shaft configured to be coupled to the blade to control the pitch angle of the blade. The inverter may be configured to supply electrical power to the coil windings to control motion of the rotor shaft in response to receiving a pitch angle control signal from a pitch angle control system of the wind turbine.

Abstract: The current profile of excitation current provided to the electrical coils of a switched reluctance machine is controlled to reduce acoustic noise. A plurality of potential current waveforms can be evaluated to select a desired waveform that reduces the acoustic noise level of the switched reluctance machine. A cumulative sound pressure level of the switched reluctance machine can be determined for each potential current waveform. The cumulative sound pressure level can be determined based on a plurality of harmonic sound pressure levels expected to result from the potential current waveform. A desired current waveform can be identified as the potential current waveform associated with an optimal cumulative sound pressure level. The desired current waveform can then be applied to the corresponding phase coil of the switched reluctance machine in order to operate the switched reluctance machine while reducing acoustic noise without sacrificing other motor performance metrics.

Abstract: Embodiments herein relate to a motor housing for ingress protection and a method of assembly thereof. In accordance with at least one aspect, there is provided a motor housing assembly for retaining an electric motor, comprising: a housing body portion extending along a housing axis between a first end and a second end; an end flange member coupled to the first end of the housing body, the end flange further comprising an exterior surface and an interior surface and a shaft-receiving opening extending between the exterior and interior surfaces for receiving a shaft of the electric motor, wherein the exterior surface comprising a groove surrounding the shaft-receiving opening; a sealing assembly disposed around the shaft-receiving opening of the end flange, the sealing assembly comprising: a flinger seal extending between a first and a second end, wherein the second end is receivable inside of the groove.

Abstract: A switched reluctance motor. The motor includes a first member having a plurality of teeth arranged in a plurality of phase groups, each phase group including two teeth mechanically joined together through a magnetically permeable bridge. The motor also includes a second member mounted adjacent the first member allowing relative movement between the first and second members, the second member having a plurality of teeth evenly spaced from one another by a pitch in a direction of relative movement between the first and second members. Each phase group includes a first tooth and a second tooth which is separated from the first tooth by a phase group tooth spacing in the direction of relative movement between the first and second members, the phase group tooth spacing equal to a whole multiple of the pitch plus a skewing factor or a whole multiple of the pitch minus the skewing factor.

Abstract: A system for controlling pitch angle of a blade of a wind turbine is provided. The system may comprise a switched reluctance motor and an inverter. The motor may be configured to be positioned at a hub of the wind turbine and coupled to the blade. The motor may have a stator and a rotor. The stator may have: (i) multiple stator poles and (ii) coil windings around each of the multiple stator poles. The rotor may be rotatably mounted with respect to the stator. The rotor may have multiple rotor poles and a rotor shaft configured to be coupled to the blade to control the pitch angle of the blade. The inverter may be configured to supply electrical power to the coil windings to control motion of the rotor shaft in response to receiving a pitch angle control signal from a pitch angle control system of the wind turbine.

Abstract: A reluctance motor has salient teeth on both the stator and the rotor. The reluctance motor includes electrical coils that are usable to generate magnetic flux to drive rotation of the rotor. Concentrated coil windings are wound around each stator tooth. The electrical coils are arranged across all the stator teeth of the reluctance motor to enable the reluctance motor to be driven by alternating current. The electrical coils are arranged so that, when excited with alternating current, the number of magnetic half-poles is equal to the number of teeth on the rotor. The reluctance machine can operate using an inverter instead of an asymmetric bridge.

Abstract: A three-phase switched reluctance machine has a rotor, a first stator and a second stator. The rotor, first stator and second stator are coaxially and concentrically disposed. The rotor and both the first stator and second stator have corresponding poles. Only one of the stators has coils wound about its poles, while the other stator does not have any coils. A defined relationship between the number of rotor poles, the number of stator poles on the first stator and the number of stator poles on the second stator may improve the torque quality of the switched reluctance machine.

Abstract: Various embodiments are described herein for switched reluctance machine configurations. In at least one embodiment, a switched reluctance machine configured according to the teachings herein includes an axially extending shaft, an axially extending rotor mounted to the shaft, the rotor having a plurality of salient rotor poles, an axially extending stator disposed coaxially and concentrically with the rotor, the stator having a plurality of salient stator poles protruding radially from the stator towards the rotor poles, a plurality of stator teeth and tooth-tips, and a plurality of electrical coils wound about the stator poles to define a plurality of phases of the switched reluctance machine, where a number of stator poles can be determined according to the following equation and at least one constraint condition: N s = N t × LCM ? ( N s , N r ) N r × N ph × S 1 × S 2 .

Abstract: Various embodiments are described herein for switched reluctance machine configurations. In at least one embodiment, a switched reluctance machine configured according to the teachings herein comprises an axially extending shaft, an axially extending rotor mounted to the shaft, the rotor having a plurality of salient rotor poles, an axially extending stator disposed coaxially and concentrically with the rotor, the stator having a plurality of salient stator poles protruding radially from the stator towards the rotor poles, a plurality of stator teeth and tooth-tips, and a plurality of electrical coils wound about the stator poles to define a plurality of phases of the switched reluctance machine, where a number of stator poles can be determined according to the following equation and at least one constraint condition: N s = N t × LCM ? ( N s , N r ) N r × N p ? ? h × S .

Abstract: Various embodiments are described herein for switched reluctance machine configurations. In at least one embodiment, a switched reluctance machine configured according to the teachings herein comprises an axially extending shaft, an axially extending rotor mounted to the shaft, the rotor having a plurality of salient rotor poles, an axially extending stator disposed coaxially and concentrically with the rotor, the stator having a plurality of salient stator poles protruding radially from the stator towards the rotor poles, and a plurality of electrical coils wound about the stator poles to define a plurality of phases of the switched reluctance machine, where a number of rotor poles can be determined according to the following equation and at least one constraint condition: N r = LCM ? ( N s , N r ) 2 × N ph .

Abstract: A three-phase switched reluctance machine has a rotor, a first stator and a second stator. The rotor, first stator and second stator are coaxially and concentrically disposed. The rotor and both the first stator and second stator have corresponding poles. Only one of the stators has coils wound about its poles, while the other stator does not have any coils. A defined relationship between the number of rotor poles, the number of stator poles on the first stator and the number of stator poles on the second stator may improve the torque quality of the switched reluctance machine.

Abstract: Various embodiments are described herein for methods and systems for controlling a switched reluctance machine (SRM) having an axially extending rotor mounted to a shaft, an axially extending stator disposed coaxially and concentrically with the rotor, the rotor and stator having a plurality of salient poles, the stator poles protruding radially towards the rotor poles, and a plurality of electrical coils wound about the stator poles including a plurality of separate phase coils defining a plurality of phases of the SRM. In one example embodiment, the method comprises providing a control system operatively coupled to a current controller of the SRM, where the control system is configured to generate a unique set of current reference profiles based on an objective function and at least one constraint function and operating the SRM based on the unique set of current profiles generated by the control system.

Abstract: Various embodiments are described herein for switched reluctance machine configurations. In at least one embodiment, a switched reluctance machine configured according to the teachings herein comprises a stator including a predetermined number of salient stator poles (Ns), a rotor rotatably mounted with respect to the stator, with the rotor comprising a plurality of salient rotor poles, and a plurality of coils provided around the predetermined number of stator poles to form at least one phase of the switched reluctance machine, where the rotor poles and the stator poles are symmetrically disposed, and a number of rotor poles is related to 0? and a number of phases according to: i) (Ns/m)k ceil (mod(k,m)/m) number of phases, and ii) (Ns/m)k ceil (mod(k,m/2)/m/2) for an even number of phases, where m is the number of phases, and k is a configuration index based on Ns and m.

Abstract: Various embodiments are described herein for a switched reluctance machine having a rotor excitation. In one example embodiment, the switched reluctance machine comprises a stator and a rotor. The rotor may be disposed inside or outside the stator. The rotor is spaced from the stator, and the rotor and the stator are concentrically disposed. The rotor has a plurality of rotor poles having an excitation source, where the excitation source comprises at least one adjustable parameter. The excitation source is provided by a permanent magnet. The dimensions and various other parameters associated with the permanent magnets are adjustable.

Abstract: Various embodiments are described herein for methods and systems for controlling a switched reluctance machine (SRM) having an axially extending rotor mounted to a shaft, an axially extending stator disposed coaxially and concentrically with the rotor, the rotor and stator having a plurality of salient poles, the stator poles protruding radially towards the rotor poles, and a plurality of electrical coils wound about the stator poles including a plurality of separate phase coils defining a plurality of phases of the SRM. In one example embodiment, the method comprises providing a control system operatively coupled to a current controller of the SRM, where the control system is configured to generate a unique set of current reference profiles based on an objective function and at least one constraint function and operating the SRM based on the unique set of current profiles generated by the control system.