Abstract: Systems, techniques, and devices are described that may be used in a minimally invasive bone realignment procedure. In some examples, a method of performing a minimally invasive metatarsal correction procedure involves using a bone preparation guide having a guide surface with a length less than a diameter of a bone to be cut using the guide surface. The clinician can guide a bone preparation instrument along the guide surface and angle the bone preparation instrument beyond one or both ends of the guide surface to cut the end of the underlying bone beyond one or both of the ends.

Abstract: A motor winding includes a wire defining a rectangular cross-section and wound in a continuous direction about a coil axis to form a continuous coil including: a first coil segment spiraling in a first plane, defining a first external terminal, and defining a first interior end inset from the first external terminal and arranged on a first side of a coil axis; a second coil segment spiraling in a second plane parallel and offset from the first plane, defining a second exterior terminal parallel to the first external terminal, and defining a second interior end inset from the second exterior coil end and arranged on a second side of the coil axis opposite the first interior end; and a junction extending between the first plane and the second plane to couple the first interior end of the first coil segment to the second interior end of the second coil segment.

Abstract: One variation of a system for an electric motor includes a rotor including magnetic elements within a body. The system also includes a stator including coil assemblies arranged about the rotor. Each coil assembly includes an outer hook element and an inner hook element. The outer hook element extends across a first axial face and an outer radial surface of the rotor. The inner hook element: extends across a second axial face of the rotor; extends partially across the inner radial surface of the rotor; and is coupled to the outer hook element to define a throat configured to locate the rotor within the coil assembly. The system includes a shaft coupled to the inner radial surface of the rotor. Furthermore, the system includes a controller configured to drive current through the coil assemblies to generate a toroidal magnetic field configured to couple the magnetic elements to rotate the rotor.

Abstract: One variation of a system for an electric motor includes a rotor including magnetic elements within a body. The system also includes a stator including coil assemblies arranged about the rotor. Each coil assembly includes an outer hook element and an inner hook element. The outer hook element extends across a first axial face and an outer radial surface of the rotor. The inner hook element: extends across a second axial face of the rotor; extends partially across the inner radial surface of the rotor; and is coupled to the outer hook element to define a throat configured to locate the rotor within the coil assembly. The system includes a shaft coupled to the inner radial surface of the rotor. Furthermore, the system includes a controller configured to drive current through the coil assemblies to generate a toroidal magnetic field configured to couple the magnetic elements to rotate the rotor.

Abstract: One variation of a system for an electric motor includes a rotor including magnetic elements within a body. The system also includes a stator including coil assemblies arranged about the rotor. Each coil assembly includes an outer hook element and an inner hook element. The outer hook element extends across a first axial face and an outer radial surface of the rotor. The inner hook element: extends across a second axial face of the rotor; extends partially across the inner radial surface of the rotor; and is coupled to the outer hook element to define a throat configured to locate the rotor within the coil assembly. The system includes a shaft coupled to the inner radial surface of the rotor. Furthermore, the system includes a controller configured to drive current through the coil assemblies to generate a toroidal magnetic field configured to couple the magnetic elements to rotate the rotor.

Abstract: Disclosed are various embodiments for winding heavy gauge coils of electric machines having fractional concentrated windings including one of more of positioning the middle of a predetermined length of heavy gauge wire in contact with an inclined chamfer in a face of a center projection of a fixture tool, simultaneously bending both ends of the heavy gauge wire in a first direction using the center projection to compete the first turn of the coil, simultaneously bending both ends of the heavy gauge wire in a seconding direction using the center projection to complete a second turn of the coil; continuing to simultaneously bend the heavy gauge wire in the first direction and the seconding direction until the required number of even or odd turns are completed, removing one of the adjoining right-angle faces of the fixture tool; and sliding the coiled heavy gauge wire off of the center projection.

Abstract: Disclosed are various embodiments for assembling a new and improved electrical motor/generator, specifically a method of producing a coil assembly is disclosed comprising: pressing a plurality of individual teeth having interlocking side features, applying a conductor around one of the interlocking side features, coupling a tooth of the coil assembly with an adjacent tooth, applying a second conductor around one of the interlocking side features of the adjacent tooth, repeating the coupling and applying steps until an entire ring has been assembled.

Abstract: Disclosed are various embodiments for a linear machine having a magnetic torque tunnel stator comprising an outer core assembly formed of a plurality of exterior permanent magnets couple to the inside retaining wall of a tube, where adjacent exterior permanent magnets are separated by an exterior ring spacer of ferromagnetic material, and an interior core assembly having a plurality of interior permanent magnets coupled to the outside wall of a central core, where adjacent interior permanent magnets are separated by an interior ring spacer of ferromagnetic material, the magnetic poles of the exterior and interior permanent magnets configured to face each other, and a coil winding assembly armature configured to be slidably positioned within the magnetic torque tunnel of the stator.

Abstract: Certain aspects relate to a continuous winding formed from a conductor of rectangular cross-section, the winding having a compound bend in the crowns connecting successive linear segments where the compound bend does not stress the conductor insulation to its failure point. The compound bend can be formed by applying force to the conductor in a first direction, thereby shaping a first bend in the conductor to form a u-shaped conductor having a crown and two linear segments, where the crown includes a v-shaped bend and two straight segments on either side of the v-shaped bend that each connect to one of the linear segments. A second bend can be formed by applying force to the conductor in a second direction perpendicular to the first direction. The shape of the second bend can depend on the desired radius of the winding when circularly wound and positioned in a stator.

Abstract: Integrated drive and motor assemblies are described herein. An example integrated drive and motor assembly includes an electric motor having a winding that concentrically surrounds an input drive shaft, an inverter for delivering power to the electric motor, a gearbox assembly coupled to the input drive shaft and an output drive shaft, the gearbox assembly having a planetary gear that includes a plurality of helical gears that couple with the input drive shaft and a ring gear. The planetary gear also includes a carrier that is rotatably coupled to the plurality of helical gears and transfers rotational forces to the output drive shaft. The assembly includes a housing that encloses the electric motor, the gearbox assembly, and the output shaft in co-axial alignment with respect to a central axis.

Abstract: A planetary gear system includes a ring gear supported by a housing, the ring gear having teeth on an inner sidewall of the ring gear, and a plurality of helical gears, each of the plurality of helical gears including a first cylindrical segment having teeth that are configured to mate with teeth of an input drive shaft, the teeth of the first cylindrical segment having helical teeth disposed at a first angle, and a second cylindrical segment extending from the first cylindrical segment, the second cylindrical segment having teeth configured to mate with teeth of the ring gear, the teeth of the second cylindrical segment having helical teeth disposed at a second angle. Advantageously, a linear axial force produced by each of the plurality of helical gears is substantially zero, which creates a thrust balancing within the planetary gear system.

Abstract: Integrated drive and motor assemblies are described herein. An example integrated drive and motor assembly includes an electric motor having a winding that concentrically surrounds an input drive shaft, an inverter for delivering power to the electric motor, a gearbox assembly coupled to the input drive shaft and an output drive shaft, the gearbox assembly having a planetary gear that includes a plurality of helical gears that couple with the input drive shaft and a ring gear. The planetary gear also includes a carrier that is rotatably coupled to the plurality of helical gears and transfers rotational forces to the output drive shaft. The assembly includes a housing that encloses the electric motor, the gearbox assembly, and the output shaft in co-axial alignment with respect to a central axis.

Abstract: Certain aspects relate to a continuous winding formed from a conductor of rectangular cross-section, the winding having a compound bend in the crowns connecting successive linear segments where the compound bend does not stress the conductor insulation to its failure point. The compound bend can be formed by applying force to the conductor in a first direction, thereby shaping a first bend in the conductor to form a u-shaped conductor having a crown and two linear segments, where the crown includes a v-shaped bend and two straight segments on either side of the v-shaped bend that each connect to one of the linear segments. A second bend can be formed by applying force to the conductor in a second direction perpendicular to the first direction. The shape of the second bend can depend on the desired radius of the winding when circularly wound and positioned in a stator.

Abstract: Thrust balanced planetary gear systems are described herein. An example planetary gear system includes a ring gear supported by a housing, the ring gear having teeth on an inner sidewall of the ring gear, and a plurality of helical gears, each of the plurality of helical gears including a first cylindrical segment having teeth that are configured to mate with teeth of an input drive shaft, the teeth of the first cylindrical segment having helical teeth disposed at a first angle, and a second cylindrical segment extending from the first cylindrical segment, the second cylindrical segment having teeth configured to mate with teeth of the ring gear, the teeth of the second cylindrical segment having helical teeth disposed at a second angle. Advantageously, a linear axial force produced by each of the plurality of helical gears is substantially zero, which creates a thrust balancing within the planetary gear system.

Abstract: A high frequency rotary transformer for an electrical machine includes a primary transformer component having a primary transformer winding, and a secondary transformer component having a secondary transformer winding. The primary transformer winding is configured to be coupled to a DC power source via a DC to AC converter. The secondary transformer winding is configured to be coupled to a winding of the rotor. Each of the primary and secondary transformer components are mechanically coupled to either the stator or the rotor. The secondary transformer component is configured to rotate with respect to the primary transformer component to produce a magnetic flux via the primary transformer winding and the secondary transformer winding.

Abstract: A stator includes a stator core, a plurality of slots, and a conductor. The plurality of slots are formed within the stator core. The conductor is disposed continuously within at least two of the plurality of openings.

Abstract: Systems and methods are provided for an automotive drive system using an absolute position sensor for field-oriented control of an induction motor. An automotive drive system comprises an induction motor having a rotor, and a position sensor coupled to the induction motor. The position sensor is configured to sense an absolute angular position of the rotor. A processor may be coupled to the position sensor and configured to determine a relative angular position of the rotor based on a difference between the absolute angular position and an initial angular position obtained when the induction motor is started. A controller may be coupled to the induction motor and the processor and configured to provide field-oriented control of the induction motor based on the relative angular position of the rotor.

Abstract: A rotor assembly is assembled by providing an elongated rectangular strip of material having a first edge and a second edge defining a width, cutting the elongated rectangular strip to form a first patterned strip having a first side corresponding to the first edge, winding the first patterned strip portion around the perimeter of the rotor core such that the first edge is adjacent to the perimeter and the patterned strip portion forms a continuous laminated ring structure. Two laminated ring structures can be cut from a single strip, thereby reducing waste material and forming a strong structure.

Abstract: A high frequency rotary transformer for an electrical machine includes a primary transformer component having a primary transformer winding, and a secondary transformer component having a secondary transformer winding. The primary transformer winding is configured to be coupled to a DC power source via a DC to AC converter. The secondary transformer winding is configured to be coupled to a winding of the rotor. Each of the primary and secondary transformer components are mechanically coupled to either the stator or the rotor. The secondary transformer component is configured to rotate with respect to the primary transformer component to produce a magnetic flux via the primary transformer winding and the secondary transformer winding.

Abstract: A permanent magnetic machine includes a stator body having a first end, a second end, and a plurality of generally radial slots formed therein for accepting a set of windings having a first set of end-turns at the first end and a second set of end-turns at the second end. The stator body has a plurality of channels adjacent to the slots and extending from the first end of the stator body to the second end of the stator body, wherein the channels are configured to allow the flow of a cooling fluid therethrough. A plurality of nozzles in fluid communication with the plurality of channels are configured to spray the cooling fluid onto the first and second set of end turns.