Abstract: An axially magnetized linear force motor employs an exteriorly faced armature (4) having a first exterior face (14) and a second exterior face (16), wherein said first face (14) is acted upon by a first axial magnetic field established by a first annular, axially polarized, permanent magnet (22) and said second face (16) is acted upon by a second axial, magnetically opposing, magnetic field established by a second annular, axially polarized, permanent magnet (26). Actuation of a coil (32) affects the first and second fields oppositely causing an imbalance of net magnetic forces. The force imbalance causes the armature (4) to displace to a point where the net magnetic force equals a counter force established by a spring (10). Positionable ferromagnetic slugs (36, 37) alter the ratio of displacement of the armature (4) to the magnitude of a signal used to actuate the coil (32).

Abstract: A variable reluctance motor having improved means for detecting the relative position of the rotor and stator during rotation of the rotor whereby signals may be employed to commutate the motor, comprising sensed means on the rotor including four sets of elements, each set located within an arcuate length of 90.degree. and each set having two sensed portions with leading edges in the direction of rotation being separated by alternating arcuate lengths of 30.degree. and 60.degree.. Sensing means comprising two sensors arcuately separated by 30.degree. times n wherein n is 1, 2, 4, or 5 are located adjacent the path of rotation of the sensed elements. In a preferred embodiment, the sensed means is a permanent ring magnet having unequal alternating arcuate North and South pole lengths, and the sensing means are two Hall effect sensors. Commutation of a three-phase motor having four rotor poles and six stator poles can thus be effected with the use of only two sensors.

Abstract: A voice coil actuator comprising a carriage assembly and a magnet assembly includes a cylindrical shorted turn resiliently mounted in the magnet assembly. The shorted turn is thereby allowed limited movement in a direction parallel to its own axis. In this way, the reaction force on the magnet assembly, caused by the movement of the carriage assembly during operation of the actuator, can be absorbed by the shorted turn.

Abstract: A dynamo assembly comprising a stator assembly and rotor assembly as shown. The preferred rotor assembly comprises two end caps, a single wire strand, a collector ring assembly and a plurality of laminants. The two end caps are preferably identical to one another, and oriented with the wire wrapped in two coils therearound. The laminants are supported between the two and caps, in a skewed manner. An advantageous arrangement for engagement between the collector ring assembly and wire held on the end caps is provided. A unique method of molding the collector ring assembly without internal inserts is also disclosed.

Abstract: An apparatus and method for forming laminations for a stacked lamination assembly of a dynamoelectric machine wherein the laminations of the assembly are provided with displacement segments and complimentary openings of slightly larger dimensional size, the segments being configured to abate lateral shifting of adjacent laminations when the segments and compatible openings of the laminations are in nesting relation in a stacked lamination assembly.

Abstract: The cap for the series loop includes a pair of identical cap sections each having side walls, an end wall having first and second segments offset in a longitudinal direction and a cover extending between the side walls and from the end wall on one side of the cap. A longitudinally extending tab lies adjacent one side wall defining a slot for receiving an opposite wall section of the other cap section when assembled. In assembly, the side walls and end wall segments of the respective cap sections are respectively intermeshed to form an enclosure open at one end for receiving the series loop, the enclosure being adjustable in width depending upon the magnitude of the intermeshing of the sections.

Abstract: An electric motor, in particular a wiper motor for driving a windshield wiper system in a motor vehicle, which comprises a gear housing including a cover and several plug contacts, of which some are fixed on the gear housing, in particular on the cover, and at least another is connected with a motor current supply lead and fitted in a plug housing. In order to provide good protection of the plug contacts and the gear housing interior against dirt, the plug housing has an opening with a circumferential rim, through which the plug contacts fixed on the gear housing enter the plug housing. Furthermore the plug housing rests firmly against the gear housing around the opening.

Abstract: A diaphragm electromagnetic drive device which comprises ring-shaped rotor and stator disposed coaxially about the optical axis of a taking lens and in which the rotor is rotated to thereby rotate diaphragm blades so as to vary successively a diaphragm diameter defined by the diaphragm blades. The mutually opposed surfaces of the rotor and stator are constructed respectively in the shape of a side surface of a truncated cone, so that the areas of the opposed surfaces can be increased without increasing the outside diameter and the length in the optical axis direction of the electromagnetic drive device.

Abstract: An electric generator and a method of securing a connection between flexible electrical leads from a rectifier and a main field winding in a rotor of the generator wherein the leads are arranged so that they extend through a generally axially extending hole in the rotor with their free ends being connected in a parallel splice configuration which extends radially outward from the hole with the connected free ends being secured with respect to the rotor so as to remain in the radially outward extending position during rotation of the rotor. The rectifier is located at one end of the magnetic core and field winding of the main generator with the rectifier leads extending through a hole in the magnetic core and a field winding insulator to the opposite end of the magnetic core and field winding for connection with the field winding leads. Rotational forces will not pull the lead wire connections apart and the connections are readily accessible for repair.

Abstract: In an AC generator having a plurality of claw-shaped magnetic pole portions in a rotor, a pair of projected portions which extend toward an outer circumference from both ends of boss portions on an outer circumference of a shaft are provided, and permanent magnets are also provided so as to abut against the projected portions so that magnetic flux is applied in the same direction as the magnetic flux applied to the projected portions when an electric current is applied to a field winding which is wound around the boss portions. With a magnetic path thus constructed, it is possible that the magnetic flux if permanent magnets is put on the magnetic flux produced by a field winding, thus applying much magnetic flux to the stator. As a result, the output per weight can be increased.

Abstract: In a circuit for overvoltage protection of a low voltage device (11) arranged to control a load (12) an energy storage capacitor (17) is connected to charge from supply (+V) while the device is controlled from a control circuit (100). During overvoltage, the controller is disconnected by switch means (15) and capacitor connected by switch means (16, 18) across the device to maintain it in an on state so that overvoltage device damage is prevented. The circuit is suited to transitory overvoltage conditions such as automotive load dump and to integration with the controlled device.

Abstract: An electric motor equipped with a cooling apparatus in which an oil reservoir (2b) filled with a cooling oil is provided in the lower portion of a casing (1). Provided in the casing is at least a portion of an oil passageway (2f, 4c, 28) which communicates with the oil reservoir (2b) and which opens within the casing (1) above and below a coil (6d) of the motor. The oil casing is internally provided with an oil pump (27) which causes the cooling oil to flow through the oil passageway (2f, 4c, 28). Accordingly, the cooling apparatus, which comprises the oil reservoir (2b), at least a portion of the oil passageway (2f, 4c, 28) and the oil pump (27), is provided within the casing (1) of the electric motor and integrated therewith. As a result, the electric motor is made more compact overall despite the provision of the cooling apparatus. Since the coil (6d) of the motor is positively cooled by the cooling apparatus, a large current can be passed through the coil.

Abstract: An intake/exhaust valve actuator includes a movable permanent magnet coupled to the shank end of an intake/exhaust valve, a first fixed electromagnet having a plurality of fixed magnetic poles confronting a side of the movable permanent magnet, for opening and closing the intake/exhaust valve under an electromagnetic force developed between the movable permanent magnet and the fixed magnetic poles, a second fixed electromagnet having a fixed magnetic pole which confronts an end surface of the movable permanent magnet when the intake/exhaust valve is closed, the second fixed electromagnet having an excitation coil, an induction coil connected to the excitation coil of the second fixed electromagnet, for supplying electric energy to the excitation coil, a resonant circuit comprising a primary coil positioned in confronting relation to the induction coil and a capacitor connected to the primary coil, and control means for supplying electric energy to the resonant circuit when the intake/exhaust valve starts bein

Abstract: A permanent magnet rotor for a brushless machine includes retainer rings to provide additional magnet retention when the magnets are stacked lengthwise along the rotor. The retainer ring seats into a groove formed on the outer surfaces of two magnets where they abut. Furthermore, end rings seated into an undercut area of the outer surface of the magnet edge at the ends of the rotor provide additional magnet retention.

Abstract: An alternating current generator with a pulley (17) for transmitting driving force from an engine to a rotor and/or to an auxiliary machine, having an external axial fan (18), rotating unitedly with the pulley (17), for drawing external air into the inside of the AC generator through air intake holes provided on both covers of the AC generator housing. The pulley (17) has air-intake vents (17a) axially extending through the pulley to permit relatively cold air to pass therethrough. At each such vent (17a), a guide member (17b) between the blades of the external axial fan (18) and the air intake holes directs the relatively cold air drawn in by the axial fan, to cool the interior components of the AC generator. The guide members (17b) further serve to shut out the outside air that has been heated from having passed near the outer surface of the housing.

Abstract: An electric rotary machine such as a motor has a rotor having a plurality of poles, a stator having a plurality of poles confronting the poles of the rotor in a radial direction, and a casing, for the rotor, having a cylindrical portion which extends in an axial direction. A permanent magnet composed of a mixed material of magnetic powder and a binder being a thermosetting resin constitutes the poles of the rotor. The permanent magnet, which is ring-shaped, is mounted in the casing along an inner circumference of the cylindrical portion of the casing in a circumferential direction. A yoke member is mounted around an outer circumference of the cylindrical portion of the casing, and a plurality of openings penetrate the cylindrical portion and the yoke member at the same time. The permanent magnet has a plurality of projections monolithically formed on its outer circumference. The projections are fitted in the respective openings in the yoke member and cylindrical portion.

Abstract: Lack of uniformity in liquid cooling the end turns of a dynamoelectric machine can be avoided in a structure including a stator (14) having a rotor receiving opening (22) and opposed end faces (18) and (20). Slots (24) in the stator (14) extend between the end faces (18) and (20) and a plurality of electrical conductors (28) are located in each of the slots (24) such that interstices exist between adjacent conductors (28) and define coolant flow passages within the slots (24) from one face (18) to the other (20). The conductors (18) exit the slots (24) at the end faces (18 and 20) and are redirected into another one of the slots (24) to thereby define end turns (30) at each end face (18 and 20). Two tubes (32 and 34) are located on each end turn (30) and adjacent ends (36, 38) of each tube (32, 34) are slightly spaced to defined a gap (40) and remote ends (42, 44) of each tube (32, 34) are sealed to the associated end face (18, 20) about the periphery of the associated slot (24).

Abstract: A stepping motor having a cylindrical stator core which is a laminate of plates each formed by blanking of a thin silicon steel plate, stator coils wound on an inner peripheral surface of the stator core, a support member fixed to a part of an outer peripheral surface of the stator core and holding a plurality of terminal plates, and a housing formed by injection molding of a synthetic resin so as to cover the outer peripheral surface of the stator core and an outer surface of the support member. First end portions of the terminal plates are made projected through the housing to the exterior of the housing and are surrounded by a socket wall integral with the housing to form a male connector, while second end portions of the terminal plates are connected with end portions of electric wires which constitute the stator coils, and are embedded in the housing.

Abstract: A linear actuator 30 set up as a powered valve comprises a stator 32 secured within a frame 34 and a rotor 38 mounted on a pair of half-shafts 40. Within the rotatable assembly are internally-threaded and oppositely-handed drive nuts 44 and 46 which are each secured to the half-shafts 40 for conjoint rotation with the rotor 38. A pair of driven members 48 and 50 are provided. The driven member 48 is externally threaded to match the internal thread of the driving nut 44, and similarly, the driven member 50 is externally threaded to match the internal thread of the driving nut 46. Since the two sets of corresponding male/female threads are oppositely handed, energization of the stator 32 to turn the rotor 38 will actuate the driven members 48 and 50 in mutually opposite directions and as the adjacent ends of the driven members 48 and 50 are formed respectively as a valve seat 54 and a valve plug 56 the valve can be opened or closed.

Abstract: A device for driving a vehicle by magnetic levitation includes a synchronous long-stator motor, with a long stator winding extending along a track of the vehicle and subdivided into a plurality of discrete stator winding sections (3.11 to 3.19; 3.21 to 3.29). The vehicle which is movable on the track supports several fixedly mounted exciters cooperating with the stator winding sections. At least one section cable (17, 28) is arranged parallel to a portion of the track and each of its ends is connected to a power sub-station. The section cable has a plurality of consecutive tap points each being connectable via a switching device to an assigned stator winding section. The switching devices are activated when the vehicle runs over the corresponding winding section.