Patent application number | Description | Published |
20080256783 | METHOD FOR PRODUCING A STATOR ASSEMBLY - The present invention provides a method for producing a stator assembly. The method initially includes providing an assembly mandrel having a generally cylindrical hub and a generally annular base circumscribing a terminal end portion of the hub. A first end ring and a stator shell are installed around the mandrel hub and onto the mandrel base. Thereafter, a plurality of poles are disposed on top of the first end ring and in a generally cylindrical pattern between the stator shell and the mandrel hub. A second end ring is disposed around the mandrel hub and on top of the plurality of poles. A plurality of stator shell tabs may then be bent in a radially inward direction to axially retain the first and second end rings. | 10-23-2008 |
20090026877 | STIR-WELDED ROTORS AND METHODS OF MAKING - Provided are stir-welded rotors and methods of making these. An exemplary stir-welded rotor may include a stack of laminations that each has spaced-apart slots arrayed on an outer circumference. The slots register with slot bars that each has a first extremity extending above the stack of laminations and a second extremity extending below the stack of laminations. A first weld extends between first extremities of adjacent slot bars, and a second stir weld extending between adjacent second extremities of adjacent slot bars. | 01-29-2009 |
20100007234 | SQUIRREL-CAGE ROTORS AND METHODS OF MANUFACTURING SAME - A method of manufacturing a squirrel-cage rotor includes: providing a laminated stack; attaching a plurality of rotor bars to the laminated stack, wherein the plurality of rotor bars each include opposite longitudinal ends; and die-casting a pair of end rings at the longitudinal ends of the plurality of rotor bars. | 01-14-2010 |
20100237736 | PERMANENT MAGNET MACHINES - A permanent magnet machine includes a rotor and a stator including plurality of stator pole sections. Each stator pole section comprises a core section having an inner end piece disposed adjacent to the core section, the inner end piece comprising a first magnetic material that is adapted to saturate during exposure to a first magnetic field strength, and an outer end piece disposed adjacent to the core section radially outwardly relative to the inner end piece, the outer end piece comprising a second magnetic material that is adapted to be unsaturated during exposure to the first magnetic field strength and to saturate during exposure to a second magnetic field strength, wherein the second magnetic field strength is greater than the first magnetic field strength. | 09-23-2010 |
20100264768 | PERMANENT MAGNET MACHINE WITH CONICAL STATOR - A permanent magnet machine includes a stator, a rotor configured to coaxially rotate with respect to the stator and having a plurality of permanent magnets coupled thereto, and an air gap between the stator and the rotor having a magnitude that is continuously adjustable. The air gap may be adjusted to optimize torque, minimize back EMF, or optimize any characteristic of the permanent magnet machine during rotation. | 10-21-2010 |
20110314660 | SPIN WELD METHOD OF MANUFACTURING INDUCTION ROTORS - A method of manufacturing an electric motor includes stacking a plurality of laminate layers to form a rotor stack. A plurality of conductor bars are inserted into a respective one of a plurality of rotor slots defined by the rotor stack, such that each of the plurality of conductor bars protrudes from the axial ends of the rotor stack. End pieces for the electric motor are rotated relative to the plurality of conductor bars to weld the end pieces to the conductor bars. | 12-29-2011 |
20130033144 | STIR-WELDED INDUCTION ROTOR - A stir-welded rotor includes a stack of laminations, where each of the laminations defines a plurality of spaced-apart slots arrayed on an outer circumference. A conductor bar may be registered with each of the spaced-apart slots of the stack of laminations, with each conductor bar including a first metal portion and a second metal portion having substantially dissimilar compositions. | 02-07-2013 |
Patent application number | Description | Published |
20140354107 | ELECTRIC MOTOR ASSEMBLY AND METHOD - An electric motor assembly includes a housing and a stator. The housing includes an outer housing surface, an inner housing surface defining an interior housing cavity, and a plurality of housing protrusions extending from the inner housing surface. The stator is disposed in the inner housing cavity and includes an outer stator surface, an inner stator surface, and a plurality of stator protrusions extending from the outer stator surface toward the outer housing surface. The stator protrusions are configured to mate with the housing protrusions to frictionally couple the stator to the housing in order to fix the stator relative to the housing. | 12-04-2014 |
20150069865 | ELECTRIC MOTOR - An electric motor includes a rotor and a stator. The stator is fixed with respect to the drive-unit housing and includes windings, and the rotor is configured to rotate inside the stator about an axis. An air gap is defined between the rotor and the stator. The electric motor also includes an end-ring fixed to the rotor for rotation therewith. The electric motor is cooled by gravity feed via a fluid flowing onto and past the stator windings, from the windings to the rotor, and from the rotor back to the stator. The end-ring includes an annular channel configured to catch the fluid flowing from the windings to the rotor and divert the fluid away from the air gap as the fluid flows from the rotor back to the stator, thereby limiting spin losses in the electric motor. An electro-mechanical drive-unit employing the above-described electric motor is also disclosed. | 03-12-2015 |
20150236702 | METHOD FOR LOAD SHARE BALANCING IN A SYSTEM OF PARALLEL-CONNECTED GENERATORS USING ACCUMULATED DAMAGE MODEL - A parallel generator system having a controller using an accumulated damage model for load share balancing, and a method for using an accumulated damage model for load share balancing in a parallel generator system. | 08-20-2015 |
20150236703 | METHOD FOR LOAD SHARE BALANCING IN A SYSTEM OF PARALLEL-CONNECTED GENERATORS USING SELECTIVE LOAD REDUCTION - A parallel generator system having at least one controller using selective load reduction for load share balancing, and a method for using selective load reduction for load share balancing in a parallel generator system. | 08-20-2015 |
20150236704 | METHOD FOR OPTIMIZING THE EFFICIENCY OF A SYSTEM OF PARALLEL-CONNECTED GENERATORS - A parallel generator system having a plurality of parallel-connected generator units and a controller for selective activation and deactivation of generator units, wherein generator units are selectively activated and deactivated by the controller based on system efficiency level and the number of active generator units, and a method for using a controller to selectively activate and deactivate generator units based on system efficiency level and the number of generator units, in a parallel generator system. | 08-20-2015 |