Abstract: A fan motor having a structure which allows a stopper to keep contact with a thrust plate on a circular contact area only, by inserting a shaft through a sleeve bearing, and by attaching the stopper, against the thrust plate, onto the end portion of the shaft. This assures uniform sliding of the thrust plate against the sleeve bearing without partial contact, even if the stopper is attached in a slight inclination with respect to the thrust plate. Localized wear of the thrust plate and rubbing mechanical noise are thus prevented.

Abstract: A dc vibrator motor has a generally cylindrically-shaped magnetically conductive case, a ring-shaped permanent field magnet, and an armature rotor including a shaft. The field magnet has at least four and at most eight alternate north and south pole sections arranged at an even angular pitch coaxially with the shaft. The armature rotor has at least three armature poles having an angular interval of 60.degree. between adjacent poles and at most six armature poles having an angular interval of 30.degree. between any pair of adjacent poles and at least six and at most twelve commutator segments arranged at an even angular pitch coaxially with the shaft. A pair of commutator brushes have an angular interval of at least 45.degree. and at most 90.degree. . Since all of the armature poles are situated within an angular range of 180.degree. about the shaft, the center of mass of the rotor is radially off the shaft, thereby causing vibrations.

Abstract: A superconducting bearing unit compring a permanent magnet mounted to a rotating shaft and a superconducting body mounted on the inner periphery of a housing surrounding the shaft, the superconducting member being adapted to be cooled with the rotating shaft moved upwards until it attains a superconducting condition, so that the rotating shaft is supported in use in a balanced condition between the weight of the rotating shaft, etc. and a pinning force caused by the permanent magnet and the superconducting member.

Abstract: An armature comprising a number of core sheets each having a number of slots and wherein a plurality of punched-in recesses for fitting are formed on the tail side of each core sheet and a plurality of punched-out protrusions for fitting provided by punching in said plurality of recesses are formed on the top side thereof, both by press-working; the core sheets being laminated by pressing the number of core sheets whereby said plurality of protrusions for fitting on the top side of each core sheet press-fit to said plurality of recesses for fitting on the tail side of a contiguous core sheet thereby positioning and integrally laminating the number of core sheets; wherein a plurality of protrusions for clearance each having a very small height are formed on the top side of each core sheet thereby providing a very small clearance between two of the contiguous core sheets.

Abstract: A microwave phase shifter has a plurality of sequentially arranged, independently-actuatable sectiions, the total phase shift is the sum of all of the sections. The phase shifter has a common substrate, supporting several switching elements, with at least one switching element being assigned to each phase section; the switching elements are fastened to the common substrate with the element connections are all substantially in a first plane above the substrate. A first layer of a dielectric material is affixed adjacent to the first plane. Phase shift elements, such as microstriplines of a known length or inductive patterns of conductor, imparting the desired section phase shift, are fabricated upon a surface of the first dielectric layer furthest from the substrate, and are interconnected to and from the sections, or onto or off of the phase shifter at this level.

Abstract: A sealed electric motor is formed by means of interfitting metallic housing members and an overmolded plastic casing. The housing includes an annular groove into which the casing extends to improve both retention and sealing.

Abstract: A power supply circuit includes a power supply stabilizing circuit, a reset circuit, and a switching circuit. The power supply stabilizing circuit stabilizes a power supply voltage from a power supply and applying the voltage to a main circuit. The reset circuit outputs a reset signal to the main circuit when the power supply voltage rises. The switching circuit is connected to the power supply stabilizing circuit. The switching circuit stops supply of power to the reset circuit when the voltage applied to the main circuit becomes a value not more than a predetermined value after supply of power is interrupted.

Abstract: An electronically-commutated DC machine having a permanent magnet rotor, generating a homogeneous magnetic field with linear and radially extending magnetic field lines. The rotor continuously changes polarity within an essentially cylindrical air gap. Meander-like stator means include linear forward and backward extending meander sections within the annular gap. Each linear meander section includes a number of conductor sections arranged geometrically parallel and having an essentially rectangular cross-sectional area. Each conductor section is located within the annular gap so that the longer side of the conductor cross-sectional area extends parallel to the direction of the magnetic field lines. A fan may be provided within the motor housing independently driven by a second stator rotor combination to produce a cooling air flow in the annular gap, cooling the conductor section of the stator means.

Abstract: Method of controlling electric valves of a converter using a universal algorithm for generating pilot signals (11) for multistage and multiphase line- and self-commutated converters (13, 14) is specified, by means of which it is possible to control different types of converters. The control algorithm can be realized as hardware or software. The invention is particularly suitable for multisystem locomotives. It is possible to change over to another feed system of the locomotive by a simple reprograming of a modulator (9) of a pilot signal generator (10). The modulator (9) and a pulse generator (8) receive modulator control signals (7) or pulse generator control signals (6) from a setter (5), together with which they form the pilot signal generator (10).

Abstract: Two coil windings per slot are disposed in a dynamoelectric machine rotor. The coil winding conductors are stacked on the sides of the rotor slots with the central coil sides separated by a plurality of insulating spacers driven between them in a radial direction and with the spacers distributed in the axial direction along the rotor slots such that radial ventilating passages are formed by the sides of the spacers and coil conductors. Coolant gases enter the slots axially below the coils and progress radially through the ventilating passages as well as the slot creepage block and wedge and discharges from the rotor into the stator-rotor air gap.

Abstract: In order to be able to ensure with low outlay a slip ring or commutator motor having a high level of freedom from noise and good running quality at maximum power, despite unavoidable deviations from circularity of the slip ring or commutator ground by the brushes abutting thereon, it is proposed according to the invention that the brushes (6; 7; 8) be supported such that they can pivot about an axis which runs radially in the vicinity of the surface and axially essentially in the axial direction of the commutator (1) or slip ring; that, according to one embodiment, the axis be formed by a guide pin (31; 41), which is retained in a brush housing (2) at least partially embracing the brush (6; 7) in the vicinity of the surface of the commutator (1) or the slip ring, and which is plugged axially through a guide slot (61; 71) running in the compression direction of the brush and open towards the surface of the slip ring or commutator (1), or that the brush (6) be tangentially embraced externally by the brush compr

Abstract: A slip ring assembly (36) adapted to mount on a rotor shaft (38) and to sealingly mount between respective seal surfaces (136,70) on a mold (134) and on a pole piece (24) during molding of a molded rotor assembly (20) is disclosed. The slip ring assembly (36) has a hub (94) supporting a pair of slip rings (102,104), a pair of terminals (96,98) and a mold shutoff ring (100) connected to the terminals (96,98). Seal surfaces (118,120) on the mold shutoff ring are adapted to sealingly mate with the respective seal surfaces on the pole piece (24) and on the mold (134) and to withstand large compressive loads being applied across the mold shutoff ring (100). The mold shutoff ring (100) prevents molten mold material from passing from the mold (134) to the slip rings (102,104) during molding of the molded rotor assembly (20).

Abstract: A motor assembly has a stator and rotor housed within a frame. An end shield is attached to one end of the frame for rotatably supporting a shaft extending therethrough. A fan is mounted to the shaft adjacent the end shield. A fan cover is mounted to the end shield and about the fan in a snap-fit manner. The end shield includes a front face and an annular side face, and has a plurality of slots formed in the annular face. The end shield also includes a boss adjacent each slot, which is formed to include at least one bearing surface and a ramp thereon. The fan cover includes a plurality of mounting brackets spaced about its inner periphery and extending outwardly toward the end shield. Each mounting bracket has a projection thereon, which is receivable within the slot on the annular face of the end shield. Each bracket also includes a backstop with a crushable rib thereon.

Abstract: Electromotive apparatus comprising at least one winding (30) including a plurality of generally triangular coil turns (34). A plurality of generally triangular stator segments (55, 56, 57) are mounted within the coil turns (34). The winding is formed by a hollow conductor, and it is shaped for connection to a source of cooling fluid. A molded support (32) is fastened to the windings 30 and to the segments (55, 56, 57) for supporting the apparatus at its outer diameter.

Abstract: A molded rotor assembly (20) for a vehicle alternator and method for making the same are disclosed. The rotor assembly includes first and second pole pieces (24,26) aligned along a longitudinal axis (40), the pair of pole pieces (24,26) defining a region therebetween. A coil wire (46) is located in the region. The pole pieces (24,26) and a slip ring assembly (36) are mounted on a rotor shaft (38). The slip ring assembly (36) has a pair of slip rings (102,104) connected to a pair of terminals (96,98) which are attached to respective free ends of the coil wire (46) to form a pair of connections (126,128). A molded insert (22) is injection molded filling the region between the pole pieces (24,26) thereby encapsulating the connections (126,128) and the coil wire (96) and forming a smooth cylindrical periphery on the rotor assembly (20).

Abstract: The invention concerns a low voltage-to-high voltage converter of the flyback type. The converter includes a transformer whose primary winding is linked to a supply voltage source via a switch and whose secondary winding is linked to the terminals of a capacitor via a rectifier diode. This converter includes, in a conventional manner, a secondary regulation loop which compares the output voltage appearing at the terminals of the capacitor, via a divider bridge, with a reference voltage in order to regulate the OFF time of the switch. Provision is made to maintain constant the primary energy accumulated in the transformer and the total charge time of the capacitor, regardless of the value of the supply voltage. Digital regulation of an open loop system is employed to control the ON time of the switch on the basis of the value of the supply voltage and the temperature of the converter. The invention finds particular utility in high-energy projectile firing systems.

Abstract: A two-pole generator rotor assembly (100) including a core (120) and a shaft for mounting the core (120). The shaft includes a pair of shaft end portions (117, 119), with each of the shaft end portions (117, 119) including an integrally formed axially extending retaining wedge portion (134) adapted to mount and retain the core (120) in the rotor assembly (100). The wedge retaining portions (134) include opposed surface portions arranged so as to define therebetween a slot for accommodating the core (120) when the shaft end portions (117, 119) are assembled so that the core (120) and shaft end portions (117, 119) form a rotor subassembly. An outer containment (114) is shrink fitted on the rotor subassembly. A tongue and groove connection (38a, 39) is provided between the respective retaining wedge portions (134) and associated shaft end portions (117, 119) so as to interlock the two end shaft portions (117, 119) together.

Abstract: A half-coil for the stator winding of an electrodynamic system such as an electrical generator or motor includes an improved tube stack arrangement and a roebelling configuration which is designed to minimize power loss. The tube stack arrangement includes, in the disclosed embodiment, two central tube stacks and two roebel bars, one on each side of the tube stacks. By this arrangement, the individual strands in the roebel bars do not need to be transposed around the tube stacks, as was the case in prior art configurations utilizing more than one tube stack. The improved roebelling arrangement includes, in the disclosed embodiment, a total 720.degree. transposition, including a 90.degree. transposition in each of the two involute portions. To accomplish the 720.degree. transposition in a limited space, the individual strands are combined into groups of two for a portion of the transposition.

Abstract: The present invention relates to an electrical machine having a permanent-magnet-excited rotor. On the perimeter of the rotor, several plate-like or lamellar permanent magnets are arranged for each rotor pole directly at the air gap adjacent to the stator of the machine. Combinations of stator-slotting harmonic fields and harmonic fields based on the division of the magnets that lead to oscillating torques. These oscillating torques are largely suppressed by having the total number of permanent magnets configured on the rotor correspond to a prime number greater than three.

Abstract: A dynamo-electric machine includes a stator core fixed in a casing and formed of stator lamination plates, and a rotor supported in a bore of the stator core and formed of a stack of rotor lamination plates. Each stator lamination plate has a tooth portion extending radially outward from the bore to an intermediate circumference, and a yoke portion defined between the intermediate circumference and the outer periphery of the stator lamination plate. Each of the rotor lamination plates has a number of equally circumferentially spaced closed slots, wherein each slot is defined by a curvilinear edge at an upper slot region adjacent the periphery of the plate. The curvilinear edge together with a pair of spaced parallel sides together define a top part of each slot, the top part opening into a bottom part of the slot which is substantially triangularly-shaped.