General Electric Company

American Standard Inc.

American Standard International Inc.

Henry G Lenz

Manoj Ramprasad Shah

Brian Thomas Sullivan

Adrian M Beltran

Michael D Matthews

Leonard Coffman

Earl K Stewart

Eike Richter

William L Bird

Walter M Schweder

A rotor analyzer for an induction motor or generator checks and quantifies the integrity of a rotor that is not currently installed within its stator. The analyzer includes an electromagnetic coil that exposes the bars of a rotor to a pulsating magnetic field to induce a current through the bars. At the same time, the rotor is slowly rotated to sequentially expose each bar. A magnetic field created by the induced current in the bars induces an analog signal within a search coil. The analog signal is converted to digital and inputted to a microprocessor system. The system interprets the input data and manipulates it to provide a clear, understandable indication of the rotor's condition, such as the relative impendence of each bar. The system also determines how many bars are within a rotor having an unknown number of bars.

Rotor analyzer for an induction motor

Active compensation in the form of a pair of trim coils and passive compensation in the form of a solenoidal-shaped magnetic shunt are disclosed for shaping the magnetic field existing in the liquid metal current collector region of an acyclic generator such as to minimize the field component normal to the stator and rotor collector surfaces and thereby substantially eliminate the generation of circulating currents in the liquid metal medium.

Magnetic field compensated liquid metal current collector for acyclic

Current barriers are incorporated in the liquid metal collector region of an acyclic generator to increase the impedance of the lossy circulating current paths therein, thereby to reduce circulating current magnitude.

Acyclic generator with liquid metal current collectors having

An internally cooled rotor for an acyclic generator has a ferromagnetic steel core to which is diffusion bonded a cylindrical copper conductor in which is embedded a multiplicity of cooling tubes communicating with coolant passages formed in the core. The cooling tubes are implanted in a hot isostatic pressure process during which the copper cylinder is at least in part created by the densification of copper powder to a non-porous mass.

Fluid cooled acyclic generator rotor having a copper conductor diffusion

An internally cooled rotor for an acyclic generator is disclosed as having a ferromagnetic steel core to which is diffusion bonded a cylinder copper conductor in which is embedded a multiplicity of cooling tubes communicating with coolant passages formed in the core. The cooling tubes are implanted in a hot isostatic pressure process during which the copper cylinder is at least in part created by the densification of copper powder to a non-porous mass.

Method for making a fluid cooled acyclic generator rotor

In the method of the invention a laminated rotor is made using four different types of laminae, to form a stack of laminae into which molten conductor metal is poured to form cast conductors through aligned conductor slots in each of the laminae while transition laminae function to prevent the flow of metal into the coolant ducts of the stacked assembly. Practice of the method of the invention provides for making a plurality of laminated rotor assemblies, all of which utilize standard duct laminae configurations, but some of which have different configurations of conductor slots in either or both the main rotor laminae and the vent laminae used therein. In the method of the invention standardized sets of duct laminae are used in making a plurality of different rotor assemblies, which have, respectively, different sizes and shapes of conductor slots through the main rotor and/or vent laminae thereof.

Method of making a laminated rotor for a dynamoelectric machine

A magnetic wedge for use in toothed stators holds the stator windings in the slots formed between the teeth of the stator. The magnetic slot wedge comprises a nonmagnetic body, with a width corresponding to the width of the slot. The nonmagnetic body has parallel laminations of magnetic material extending part way through the width of the magnetic body from both sides of the magnetic body and perpendicular to the top surface. A central nonmagnetic region is thereby created with a region on either side of the central portion having an average permeability, along its length, substantially in the range of about 5-10.

Magnetic slot wedge with low average permeability and high mechanical

Dynamoelectric machine end cap

Housing for electric motor

A laminated rotor for a dynamoelectric machine characterized by requiring and incorporating only two differently configured sets of rotor laminations to afford axial and radial coolant passageways through the rotor. Each lamination in the respective sets is provided with punched apertures that form, respectively, conductor slots arcuately spaced around its periphery, and is further provided with a plurality of axial coolant passageways near its inner diameter. Each lamination in one of the sets of laminations also includes a plurality of arcuately spaced radial ducts, each disposed between a respective pair of conductor slots. The axial coolant passageways in one set of laminations are arranged to overlap a predetermined portion of the inner ends of the radial ducts in the other set of laminations to enable cooling air to be forced through the axial coolant passageways into the radial ducts and then into the air gap of the machine when the sets of laminations are stacked to form a rotor that is then mounted in operating position, relative to an associated stator.

Laminated rotor for a dynamoelectric machine with coolant passageways

A rotor assembly for a dynamoelectric machine is characterized by incorporating three different sets of rotor laminations each of which is provided with punched apertures that respectively form conductor slots arcuately spaced around the periphery of the laminae, a plurality of axial coolant passageways extending through the assembly near its inner diameter, a plurality of arcuately spaced radial ducts at axial intervals along the rotor, and vent passageways connecting the radial ducts to the axial coolant passageways to enable cooling air to be forced through the coolant passageways and the vent apertures into the radial ducts and thence into the air gap of the machine when the rotor is assembled in operating position. The rotor of the invention is particularly characterized by incorporating radial cooling ducts that extend between each adjacent pair of conductor slots from the periphery of the rotor to points substantially below the bottoms of the conductor slots in the rotor laminae. All of the laminae are stacked in aligned position and compressed to form tight seals therebetween that prevent molten metal from flowing out of the conductor slots into the interstices between the respective laminations of the assembly during a rotor casting operation.

Rotor laminae assembly for a cast rotor dynamoelectric machine

A laminated rotor for a dynamoelectric machine is formed by stacking a plurality of sets of punched laminae on one another to define axial coolant passageways, radial vents and coolant ducts and axial conductor-receiving slots through the assembled rotor. Each of the sets of laminae include a group of main rotor laminae, a group of vent laminae, a group of duct laminae and a transition lamina positioned between the vent laminae and duct laminae. In addition, a transition lamina is positioned between each set of stacked laminae thereby to arrange one transition lamina on opposite sides of each group of duct laminae, to effectively block molten metal from flowing out of the conductor slots into the coolant ducts of the duct laminae.

Growing community of inventors

Scotia, NY, United States of America

Henry G Lenz