Abstract: An electric motor for an electric car, in which an outer ring of a ball bearing used in the non-work side of a rotating shaft is supported fixedly by a rear bracket so that the shaft is fixed in the axial direction move. A cylindrical roller bearing is used in the work side of the rotating shaft, so that the rotating shaft is secured to the inner periphery of the rear end of an output carrier of an epicycle reduction gear and the outer periphery of the rear end of the carrier is supported through a ball bearing by an intermediate bracket. An oil seal is provided for sealing between the intermediate bracket and the rotating shaft, the inner diameter of the oil seal being greater than an outer diameter of the inner ring of the cylindrical roller bearing.

Abstract: A stator core for rotary high power density electro-mechanical transducers formed of multiple segments which have a plurality of radially oriented teeth. The stator core is a composite of two or more segments circumferentially combined to form a cylindrical stator or armature for electric motors or generators. The segments are wound with wire either when the segments are aligned linearly, when arranged circumferentially on the inside surface of a jig or about a cylinder. The wound stator can have teeth extending radially outwardly or inwardly, to accommodate an outside or inside rotor.

Abstract: A rotor (10) for a synchronous motor includes a plurality of permanent magnets (14) arranged at generally equal intervals around a shaft (12), and a plurality of core members (16) arranged around the shaft (12) while holding each permanent magnet (14) therebetween in a circumferential direction, so as to constitute magnetic poles. Each core member (16) has a symmetrical plane (S) involving a center axis (0) of the shaft (12), and is provided with a rod insertion hole (20) axially passing through the core member so as to involve the symmetrical plane (S) at the generally center of the core member. A rod member (22) is inserted into each rod insertion hole (20).

Abstract: An electrostatic actuator comprising:a first member (1) having a plurality of belt-like electrodes (4) insulated from one another and disposed in a predetermined direction with predetermined gaps between them;a second member (10) constituted by a resistance body on the opposed surface thereof coming into contact with the surface of the first member (1); andcontrol means (11) capable of changing an impressed voltage to be applied to each of a plurality of belt-like electrodes disposed on the first member;the control means (11) being constituted so as to move the first and second members relative to each other by applying a predetermined voltage pattern consisting of a pulse voltage to the belt-like electrodes.

Abstract: An electromagnetically actuated friction welder produces orbital motion at interfaces between parts (usually of thermoplastic material) to bond the parts by fusion generated by friction. This welder can also be operated alternatively to produce reciprocating vibratory forces thereby providing flexibility as to the selection of an orbital or reciprocating mode, depending upon the joint to be welded. The velocity of motion is controllable preferably around the resonant frequency of the driven structure by adjusting the frequency of the AC power which operates the electromagnetic drive motor of the welder. A plate which carries one of the parts to be welded and which is driven is flexurally mounted for movement in an orbital plane or planes containing the interfaces without substantial tilting by an array of stiff members, such as rods, located around the drive motor, attached to the plate at one end and to a tubular structure at the opposite ends thereof.

Abstract: A delay matching circuit has a first node (48), a second node (50), a first loading circuit (54, 56), a second loading circuit (58, 60), a third loading circuit (64) and a buffer circuit (62). The first loading circuit couples a first logic state to the first node responsive to a first state of a control signal. The second loading circuit couples a second logic state to the first node responsive to a second state of the control signal. The buffer circuit electrically couples the first and second nodes. The first loading circuit, second loading circuit and buffer circuit are characterized by a first, a second and a third predetermined electrical impedance, respectively. The third loading circuit is coupled to the second node and is characterized by a fourth predetermined electrical impedance. The disclosed delay matching circuit propagates a clock signal input with a delay equal to the Clock-to-Q delay associated with a flip-flop constructed with similar circuit elements.

Abstract: In a three-phase four-pole armature winding of the double-layer lap type, three first pole windings of respective phases are dispersively arranged in first divided regions obtained by dividing all the slot region into three equal regions and three second pole windings of the respective phases following the respective first pole windings are dispersively arranged in second divided regions obtained by dividing all the slot region into three equally divided regions. Third and fourth pole windings are dispersively arranged in respective slot regions in the same manner. The first and second divided regions are circumferentially shifted from each other by an electrical angle of 180 degrees. Insertion of all the coils belonging to each of the first to fourth pole windings in all the phases is completed by one coil inserting operation of an automatic coil inserter.

Abstract: An inrush current limiting circuit contains an FET as an active component which is controlled by a network of passive components. The network includes a gate control circuit for controlling the operation of the FET and a negative feedback circuit which responds to the load voltage during the transient state. The current limiting circuit is fast acting during momentary power interruptions and has low power losses.

Abstract: A coreless motor has a permanent magnet integrated with a casing, a commutator, and a rotor coil unit integrated with an output shaft. The rotor coil unit is comprised of an integral number of coil blocks superposed with one another. Respective coil blocks have a displacement angle of X.sub.M =360.times.M/n degrees relative to a reference coil block, wherein X.sub.M denotes the displacement angle of the Mth coil block relative to the reference block, M denotes a positive integer from 1 to n-1 (the Mth coil block relative to the reference block), and n represents the number of coil blocks and is an even integer having a value of 4 or more. Each coil block shares a center angle of X.sub.2 +360/P degrees, wherein X.sub.2 denotes the displacement angle of the second coil block relative to the reference block, and P denotes the number of poles of the permanent magnet.

Abstract: A support assembly for the end windings of a turbine generator includes a plurality of braces which are spaced apart around the circumference of the winding basket and which are mechanically connected to support rings disposed around the stator coils. The support assembly is decoupled from the stator core such that the end windings and end winding support structure float freely of the stator core during normal generator operating conditions. During abnormal short circuit operating conditions, the support assembly contacts brackets on the stator core such that the end windings are slidably engaged upon and supported by the stator core. Radial clamps tightly secure the top and bottom coils to the end winding support assembly to apply radial compressive load to the coils to prevent radial displacement of the coils and to maintain the end winding-end winding support structure as a monolithic structure capable of withstanding abnormal operating conditions.

Abstract: An electric motor brush subassembly includes a housing base, a housing cover, a brush, and a constant force spring. The brush is mounted between the housing base and the cover with the coil of the spring mounted adjacent to the outer end of the brush. The axis of the coil is disposed at a right angle with respect to the length of the brush and an unrolled spring segment extends along a side of the brush and is fixed in a slot in the cover. The spring exerts a force against the brush to bias the brush against the motor commutator.

Abstract: A rotor (31) of a brushless motor includes a rotary shaft (32), a main yoke (33) fitted over the rotary shaft, two magnetic pole heads (34a, 34b) radially projecting from the main yoke, two permanent magnets (36a, 36b) provided on the yoke between the magnetic pole heads such that the magnetic poles of identical polarity face each other across the rotary shaft, two auxiliary yokes (38a, 38b) mounted on the permanent magnets, and a cylindrical sleeve (40) made of a non-magnetic material provided on the outer circumferential surface of the magnetic pole heads and the auxiliary yokes.

Abstract: Carbon commutator segments are secured to a base member by means of integral anchor pieces disposed within axially extending, cruciform-section slots formed in the outer cylindrical surface of an insulating base member. Elongate contact members having lateral edges seated in lateral parts of the slots are embedded in the anchor pieces and are each provided, at one end, with a terminal for connection to an armature winding lead wire. The carbon segments and the integral anchor pieces are formed by enclosing the base member, together with assembled contact members, in a mould and then injecting a mouldable mixture of carbon powder and carrier material into space between the mould and the assembly. When the injection moulded layer has solidified, an annular-section outer portion of this injection moulded layer is divided into segments by means of axially-extending radial cuts.

Abstract: An electric motor consisting of an inside stator part and a rotor part placed outside and concentrically in relation to the stator part, has a high number of permanent magnets (13) on the inside of the rotor part. The magnetic fields from these permanent magnets interact with magnetic fields between flux-conducting lamella blocks (30, 35) engaging the coil cores (8) on the stator. The lamella blocks (30, 35) are T- and .GAMMA.-shaped with top beams (25, 27) pointing in directions parallel to the axis, and the top beams (25, 27) are positioned to provide substantially circumferentially directed magnetic fields in flux gaps (36) therebetween. The magnetic fields in the flux gaps (36) between the top beams (25, 27) are reversed in successive order, and under time control from an electronic regulator.

Abstract: Brush for electric motors obtained by compression of an electrically conductive powder containing one end of an electrical conductor so as simultaneously to allow the formation of the brush and the mechanical fixing of said electrical conductor, and characterized in that the density of at least a portion of the compressed powder in contact with the end of the immersed electrical conductor is higher than the mean density of the compressed powder so as to improve the strength of said mechanical fixing when said brush is subjected to vibrations.

Abstract: A modular, expandable, low-weight electric motor has a cylindrical, non-magnetic casing formed in axially-aligned sections. The casing sections are releasably connected to define a unitary structure with a polygonal exterior surface and a circular interior surface. Separate U-shaped stator pole assemblies are releasably mounted against the exterior of the casing, each casing section carrying the poles associated with a different motor phase. The poles extend through apertures into the interior of the casing, and have active pole faces which are curved and substantially flush with the circular interior surface of the casing. A modular rotor is mounted in the interior of the casing and carries magnetic elements in axially spaced-apart sets corresponding to each motor phase. The active faces of the magnetic elements are curved and oriented in a cylindrical arrangement.

Abstract: A tachogenerator for speed control of an electric motor including a stator and a rotor. A multipole permanent magnet is connected to the rotor and has at least a pair of magnetic poles, with the pole centers of the magnetic poles being uniformly arranged on a circle of a predetermined diameter. A wave winding is connected to the stator and separated from the magnet by an air gap having a width. The wave winding having angular repeat units of the wave winding equal to from 0.5 to 1.5 times a ratio of the diameter divided by the width.

Abstract: A rotor for an electrical machine comprises a bobbin, a winding, and two pole pieces. The winding comprises a wire wound around the outer surface of the bobbin. At least one flat on the outer surface of the bobbin is imparted on the winding, mechanically locking the winding to the bobbin. The bobbin is concentrically disposed over hubs on the two pole pieces, the bobbin and the hubs having complementary flats which only allow assembly of the bobbin and the hubs when the flats are aligned. A method for producing a rotor comprises providing a bobbin with at least one flat on its outer surface and at least one flat on its inner surface; winding wire around the outer surface of the bobbin to create a winding with at least one flat in it; providing two pole pieces with hubs with complementary flats to the at least one flat on the inner surface of the bobbin; aligning the flats on the hubs and on the inner surface of the bobbin; and inserting the hubs into the bobbin.

Abstract: An offset gearbox of an aircraft has a sump for a lubricant. A heat exchanger core extends through the sump in contact with the lubricant. A fluid coolant for cooling an accessory such as an electrical power generating unit drivingly connected to the offset gearbox is circulated through the core in thermal communication but not mixed with the lubricant of the offset gearbox for cooling the lubricant. The cooling arrangement for the offset gearbox advantageously does not require a separate or dedicated heat exchanger which reduces system weight and cost. The single pump of the accessory can also be used for circulating the coolant. Increased reliability, independent oil change for maintenance and enhanced attitude performance are attained as gearbox performance does not affect power generating unit performance, and visa versa. An existing aircraft can be modified to include the offset gearbox with a minimum of modification and little additional weight and plumbing.

Abstract: A permanent magnet rotor (1) used in a corrosive atmosphere or liquid and provided with field permanent magnets (10) inserted into slots (9) of a lamination of silicon steel plates (2), wherein the outer surfaces of the field permanent magnets (10) are covered with anticorrosive plates made of an antiicorrosive material. The field permanent magnets (10) of the permanent rotor (1) can be used without being corroded, and the rotor (1) can be easily manufactured.