Abstract: A rotor comprising stacked laminations having conductor slots and axial passageways provided with closed-slot spacer assemblies that are stacked in groups between selected axially spaced rotor laminations to hold said laminations apart while sealing the conductor slots thereby to form radial cooling ducts through the laminations of the selected axially spaced groups and around the closed-slot spacer assemblies. According to the method of the invention, the spacer assemblies are secured in selected operating position by being staked to certain of the main rotor laminations, and a characteristic staking procedure is used to secure individual plates of each of the assemblies together.

Abstract: A dynamoelectric machine commutator structure having a plurality of conductive commutator segments secured in operating position by a commutator banding is characterized by including a flexible, thermally stable dielectric coating material between the outer edges of the commutator banding and the conductor segments in order to effectively seal the junction between those members, thereby preventing the deposit or buildup of electrically conductive contaminants at that junction so that the likelihood of electrically short circuiting the conductive segments of the commutator is effectively eliminated. According to the preferred method of the invention, a banded commutator is formed by applying such a coating to predetermined portions of the banding grooves so that the coating effectively seals the junctions between the banding and the conductive segments of the commutator, thereby preventing the accumulation of conductive contaminants at those junctions.

Abstract: An apparatus including a first part, a second part, a plurality of spaced apertures in the first part and a plurality of holding devices for holding the first part against the second part. The plurality of apertures are each selectively sized so a first of the apertures forms a close clearance fit with one of the holding devices on at least one diameter of the first aperture. A second of the apertures forms an equally close clearance fit, on one of its diameters, with a second of the holding devices, but forms a looser clearance fit with the second holding device on a second diameter thereof, which generally parallels a line between the first and second apertures. The remainder of the plurality of apertures each form a substantially looser fit with an associated holding device than is formed by either of said close clearance fits.

Abstract: A dynamoelectric machine having a rotatable conductor on which a reciprocally mounted brush rides is provided with a brush wear indicator, comprising, an electro-mechanical transducer connected between a self-winding, brush-biasing spring forming part of the brush holder assembly and a brush wear signalling means in order to actuate the signalling means responsive to a predetermined degree of brush wear that causes the brush biasing spring to move an active element of the transducer a predetermined distance thereby effecting such actuation.

Abstract: A spring-mounted thrust bearing having pads that are immersed in lubricant and provided with coolant-distributing grooves in the face of each thrust pad is combined with a high pressure pumping means connected to force a flow of coolant between the thrust pad bearing surfaces and an associated runner surface in a high volume that is between 1/3 and 1/2 the flow rate of lubricant that is swept between those surfaces by normal relative rotation of the surfaces.

Abstract: A packaged stator core assembly and a method of making such an assembly and mounting it on a housing frame. Arcuately spaced tension ribs secure two annular clamping flanges in compression against opposite ends of a stack of stator laminations. Torque ribs, each having an angular cross-section and a key portion located substantially at its shear center, are welded between the clamping flanges to hold the ribs in engagement with positioning slots or tabs on the outer periphery of the stacked laminations. The lines of reaction torque force from the laminations to the ribs pass essentially through the shear centers of each rib. In the method of the invention the ribs are welded to the clamping flanges and the stator core package is mounted in a housing frame by welding only the flanges to the frame.

Abstract: 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.

Abstract: A dynamoelectric machine pole and coil assembly having a magnetic pole member around which a preformed coil of insulated magnet wire is mounted. The assembly is characterized by including a plurality of preformed, extended corner sheets of insulating material that are positioned to extend around and beyond each of the corners of the magnetic pole member into overlapping relationship with adjacent extended corner sheets. The extended corner sheets are bonded to the pole member and to one another at their overlapped ends. Projecting tip portions on the magnetic pole member have their upper surfaces completely shielded from the energizing coil by lip parts of the extended corner insulating sheets. A felt piece impregnated with thermosetting resin is used to make a readily conformable corner section of the lip part. The cured piece is free of voids, so reinforces the insulation of the ground barrier of the assembly at the critical corner areas.

Abstract: 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.

Abstract: A packaged stator core assembly and a method of making such an assembly and mounting it on a housing frame. Arcuately spaced tension ribs secure two annular clamping flanges in compression against opposite ends of a stack of stator laminations. Torque ribs, each having an angular cross-section and a key portion located substantially at its shear center, are welded between the clamping flanges to hold the ribs in engagement with positioning slots or tabs on the outer periphery of the stacked laminations. The lines of reaction torque force from the laminations to the ribs pass essentially through the shear centers of each rib. In the method of the invention the ribs are welded to the clamping flanges and the stator core package is mounted in a housing frame by welding only the flanges to the frame.

Abstract: Electrical insulating sheet material characterized by a coating of thermosetting resinous adhesive material distributed over two sides of a sheet of aramid paper, in combination with a pattern of pressure sensitive adhesive material applied to one side of the aramid paper sheet.

Abstract: An armature lamina for a dynamoelectric machine characterized by having a plurality of equally spaced winding slots formed around its periphery so that the winding-receiving gap, or mouth, of each slot is positioned near one side thereof, rather than being positioned at the center of the slot. In a preferred embodiment, the winding slots are divided into groups such that half of the slots have their respective mouths positioned adjacent the leading slot side while the remaining half of the slots have their respective mouths positioned adjacent the trailing slot side. This characteristic off-centered arrangement of the respective slot openings enables a maximum number of energizing windings to be positioned in each slot when the laminae are stacked on a spindle and wound with coils of insulated magnet wire to form a random wound armature. Alternative embodiments are provided for short pitch and double fly wound machines.

Abstract: A method for making and applying to a dynamoelectric machine an adhesively bonded, irradiation curable, resin treated glass banding that retains a pre-stressed tension therein when the banding is subjected to a variety of mechanical vibration and temperature changes. The banding is applied in pre-stressed layers and is further characterized by having a substantially uniform thickness of cured resin between each layer thereof, in a range between 0.5 and 2 mils, despite any variation in the pre-stressing tensions applied to the respective layers of the banding.

Abstract: A high pressure thrust bearing assembly having a rotatable runner ring mounted in sliding relationship on a plurality of flexible thrust plates, which in turn are resiliently supported on a plurality of spring subassemblies positioned between the thrust plates and an angular base member in the assembly, is characterized by having a plurality of Belleville spring discs mounted in each of the spring subassemblies. The spring discs are supported in coaxial relation on a screw, between a first and a second washer in each of the spring subassemblies, in a manner such that the spring discs are pre-compressed between the washers to bias them away from one another with a constant biasing force.

Abstract: A thrust bearing assembly for positioning and maintaining both washers of a spherical roller thrust bearing in alignment with a rotatable shaft that is supported by the bearing. The assembly is characterized by including a reciprocally movable chair member for seating the housing washer of the spherical roller thrust bearing in a manner that prevents the washer from being unduly tilted relative to its axis of rotation when the chair member slides axially relative to the shaft. A back portion of the chair member is made to exceed the height of the housing washer by a predetermined amount such that the relationship of its height to the overall diameter of the chair member is a desired ratio relative to the radial clearance of the chair member with its supporting housing. This relationship of the components prevents the housing washer and chair member from tilting more than an established tolerance angle relative to the axis of rotation of the shaft.

Abstract: Electrical insulating sheet material characterized by a coating of thermosetting resinous adhesive material distributed over two sides of a sheet of aramid paper, in combination with a pattern of pressure sensitive adhesive material applied to one side of the aramid paper sheet. An electrical winding insulated with the sheet material of the invention is characterized by incorporating sheets of the insulating material between facing flat sides of the turns of the winding with the sheets initially held in position on the winding during early phases of its manufacture by the pressure sensitive adhesive. In the final manufactured form of the winding its turns are compressed and baked to thermally cure the thermosetting resinous adhesive material and bond it to the sides of the winding and the aramid paper sheet.

Abstract: A rotor assembly for a dynamoelectric generator having a spider sub-assembly that is rotatable around a non-vertical axis; characterized by having a plurality of articulated key assemblies positioned in aligned keyways formed, respectively, in the circumferential surface of the spider sub-assembly and in the inner circumferential surface of an annular laminated rotor rim. A base member in each of the key assemblies is formed to exceed by a predetermined length the normal, i.e., unheated, spacing between the rotor rim and the spider. The rotor rim is heated to expand it radially so the base members of the key assemblies can be inserted in the aligned axial keyways in the rim and spider, then the rim is cooled to heat-shrink it against the base members of the key assemblies.

Abstract: In the method of the invention a permanent magnet field pole is manufactured by welding a plurality of preformed base member laminae to thereby form a rigid pole base member. A plurality of preformed face member laminae are secured together by rods extending through aligned apertures therein. A head on one end of each such rod cooperates with a spring clip member affixed to the other end thereof to continuously exert a resilient clamping force on the laminae thereby retaining them in a relatively flexible desired pole face configuration. The rare earth magnet sub-assemblies are made by arranging rectangular magnet bars of rare earth material in aligned configurations then adhering the bars to parallel plates positioned on opposite sides of the bars.

Abstract: A positioning apparatus for a centrifugal casting machine having an articulated mold that is mounted for rotation in a cantilevered manner on a drive shaft. The positioning apparatus includes a pair of pillow block bearings having arcuate bearing races that operate to allow the drive shaft to be tilted within a predetermined angular range relative to its longitudinal axis. In addition, the positioning apparatus includes a plurality of locking pins each of which are mounted to cooperate respectively with one of a plurality of positioning members mounted on a rotatable mold-supporting face plate of the casting machine. Operation of the lock pins into engagement with the positioning members moves the face plate into a predetermined position relative to its axis of rotation, following a casting cycle of the machine, so that segments of the centrifugal mold can be radially stripped from an article cast therein without unduly distorting the cast article.

Abstract: A glass banding for a dynamoelectric machine characterized by incorporating an irradiation curable resin impregnated in pre-stressed layers of the banding. The banding is further characterized by having a substantially uniform thickness of cured resin between each layer thereof, in the range between 0.5 and 2 mils, despite a variation in the pre-stressing tensions applied to the respective layers of the banding. A novel method is also encompassed by the invention for making an adhesively bonded, irradiation curable, resin treated glass banding that retains a pre-stress tension therein when the banding is subjected to a variety of mechanical vibrations and variations in temperatures applied to it.