Abstract: A hot pluggable connector of the invention accompanies no physical shock when a circuit package (9) is plugged or unplugged. When the circuit package (9) is inserted, board-side terminals (34) and package-side terminals (52) of the hot pluggable connector are not put in contact. By rotating a rotary body (32) having pads (33A to 33C) of different lengths, sequential connection/disconnection between the board-side terminals (34) and the package-side terminals (52) are performed by way of the pads (33A to 33C). Therefore, it is not necessary to plugging or unplugging the circuit package (9) within a time limit, enabling to insert or remove the circuit package (9) quietly. The timings of the sequential connection/disconnection can be arranged only by arranging length difference of the pads (33A to 33C), enabling to reduce production cost of the hot pluggable connector.

Abstract: The present invention provides a reliable high current connector for connecting the ground and power planes of a first PCB to the ground and power planes of a second PCB. The power bus bar is comprised of a first conductive structure having a first and second surface, a second conductive structure having a first and second, and an inner insulative structure positioned between the first surface of the first conductive structure and the first surface of the second conductive structure. A fastening means, inserted through openings in the conductive structures, provides a secure, low resistance electrical connection from the first or second conductive structure of the bus bar to the electrical traces of the PCB. The high dielectric constant of the insulator provides distributed capacitance between the first conductive structure and the second conductive structure, lowering the AC impedance.

Abstract: A safety receptacle includes a base (10) formed with a circular depression (11) and two opposite cavities (18) one at a side of the depression, two conducting members (19) each fitted into a respective one of the cavities of the base, a rotary head (20) being a tubular member formed with a top having two parallel slots (20), a pair of opposite flanges (24) extending outwardly from two opposite sides of the tubular member, a block (28) depending downwardly from a central portion of a lower side of the top, and two vertical slots at two opposite sides of the tubular member, a positioning member (17) having an upper end fixedly fitted in the block of the rotary head and a lower end engaged with the recess, two terminals (22) each inserted into a respective one of the vertical slots along the two legs and provided with an inwardly extending tongue (221) , and a cover (30) fixedly mounted on the base and having a circular opening for receiving the top of the rotary head, whereby rotation of the plug (40) through 9

Abstract: An air cooler for an enclosed frame motor wherein two air-to-air heat exchangers are located in an enclosure mounted above an opening in the frame. The heat exchangers are disposed so that the heat exchanger coolant tubes extend transversely to the longitudinal axis of the motor drive shaft. The heat exchangers are positioned at opposed ends of the motor and inclined toward one another in an A-shaped configuration. The enclosure forms an enclosed region with the frame, isolating motor air inside the region from ambient air outside the region. An intake plenum is coupled with the enclosure on one side to direct ambient air into the interior of the heat exchanger coolant tubes at one end, whereby the ambient air exits from the tubes at the other end. Motor air surrounding the motor is heated during operation and circulated by an internal fan among the heat exchangers.

Abstract: An electromagnetic actuator has a fixed part (1,2,3,4) constructed of ferrite material and a sliding part (15) constructed of electrically conductive material. The fixed part comprises an outer tubular portion (2), a central disc (1) and two central core members (3 and 4) secured on either side of the disc (1). The sliding part (15) comprises two annular elements (9 and 10) arranged to slide in the gaps (5 and 6) between the cores (3 and 4) and the outer tubular portion (2). Coils (7 and 8) are positioned round the central cores (3 and 4). The two annular elements (9 and 10) are rigidly coupled together by means of a shaft (14) extending through the cores(3 and 4). The actuator acts as a position controller by control of the relative magnitudes of the ac currents supplied to the coils. It can also act as a force applier when the sliding part (15) is moved to a predetermined position and only one coil is energized.

Abstract: A turboalternator for a hybrid motor vehicle includes a low speed portion having a low speed axial shaft and integral motor rotor to generate electrical power, a high speed portion having a high speed axial shaft and integral motor rotor to generate electrical power, the high speed axial shaft being generally parallel to the low speed axial shaft and being independent from each other.

Abstract: A permanent magnet machine combines both principles of variable reluctance machines and permanent magnets, and comprises a rotor with salient rotor poles and a stator with salient stator poles. A pair of ferrite arched permanent magnets are embedded in the stator yoke beneath respective stator poles and are arranged symmetrically around the central axis of the machine. A field winding for boosting or weakening the primary flux generated by the permanent magnets is wound in a special arrangement.

Abstract: The present invention concerns a motor for generating torques around more than one axis with respect to an object that can be rotated and revolved around only one point. Only one mechanism is necessary to maintain a prescribed position or to produce changes in position around one or more axes (X, Y, or Z).The permanent-magnet excited synchronous machine comprises stator shells (10 & 10.1), multiple-phase windings (11 & 11.1), and a rotor (12) with permanent magnets (13 & 13.1), whereby the annular and spherical surfaces (14) of the rotor are more extensive than the annular and spherical surfaces (15) of the shells.All the spherical surfaces share the same center (M) of curvature, which simultaneously constitutes the origin of the coordinate systems, and the center of rotation. The shaft (17) is supported only at the center of curvature and such as to ensure freedom of motion throughout the reference coordinate system (21).

Abstract: A linear voice coil actuator using a removable electromagnetic coil includes an electrically conductive wire wound on a plastic bobbin. The wire which is wrapped around the bobbin is connected to an external power source as the electromagnetic coil is attached to the linear voice coil actuator. Current applied from the external power source causes the electromagnetic coil to selectively generate a magnetic field and, in response to generation of the magnetic field, to move translationally within a fixed magnetic field. The translational movement of the coil moves a grip which is mounted on the coil to allow the grip to selectively position and manipulate objects and things.

Abstract: A single sided servo apparatus comprises a linear motor and a longitudinal carriage which is connected to the linear motor at one end thereof. The linear motor comprises a stator including field magnets arranged linearly and a movable piece including armature coils. The field magnets have a trapezoid-like magnetic flux distribution. An arrangement pattern of the field magnets has a relative tilted angle to an arrangement pattern of the armature coils, so that a free end of the carriage precedes the other end thereof connected to the linear motor. Then, the thrust has a small variation and generates a stable thrust of the servo apparatus.

Abstract: A passive magnetic bearing structure for radially supporting a rotor with respect to a stator is provided, in which a magnetic circuit is mounted on the rotor or stator for generating two strongly different axial magnetic fields in two concentric angular gaps coaxial to the rotation axis and radially spaced from one another. At least three shortened superconducting turns are mounted on the stator circumferentially around the rotation axis so that under any tolerable shift of the rotor, one edge of every turn will be placed in one annular gap comprising magnetic field, and the radially opposite edge will be placed in the other gap.

Abstract: An X-Y positioning machine has a forcer, with armature coils, that moves around on a platen, supported by an air bearing. Magnets embedded in the motor platen generate a fixed magnetic field with which the armature coils interact. Perpendicular elongated coils interact with the fields of magnets in columns and rows. When a traditional rectangular pattern of the magnets is provided, a packing density and average peak magnetic flux intercepted by the coils are limited to 50%. The present invention provides magnet configurations that provide greater than 50% maximum peak flux density and up to 100% packing density. Several magnet arrangements are provided: a first in which round magnets are used instead of square, and a second in which diamond-shaped magnets are used. The latter can be used at 100% packing density arrangement. In addition to high peak flux density for a narrow coil, these embodiments exhibit low cogging forces. A method of making the magnet is also provided.

Abstract: Disclosed herein is a modular motor comprising a discoidal stator unit and a discoidal rotor unit rotatable about an axis of rotation under a torque established therein, the stator unit being supported by a frame arrangement and having a winding assembly within in a matrix of polymer material, the winding assembly including a number of winding elements, each of the winding elements having a pair of radially disposed portions, wherein at least one of the radially disposed portions of each winding element is spaced from a radially disposed portion of another winding element to form a cooling region therein, the cooling region being arranged for the location therein of thermally conductive materials having a thermal conductance of at least 1.5 w.multidot.cm/(cm.sup.2 .multidot..degree. C.), thereby to transfer heat from the stator unit and toward the frame arrangement during operation of the motor.

Abstract: A stepping motor having a rotor includes a permanent magnet and a plurality of stators and coils provided around the permanent magnet. The motor also includes a resiliently deformable portion integrally provided with a stator case for biasing the stators toward an output shaft of the motor, whereby the stators are made reliable fixable in the stator case and when the rotor is to be mounted in the stator case, and a lead screw of the output shaft is prevented from being injured.

Abstract: A sensorless active magnetic bearing suitable for use in rotating machinery and seals, contemplates a circuit and a process for actively controlling the position of an object using magnetic forces without mechanical contact between the object suspended 10 and the components of the magnetic positioner, and without the necessity for discrete sensors for determining the position of the object suspended. Electromagnets L.sub.1 and L.sub.2 are placed in an ordered coaxial array surrounding an object to be suspended, and impart magnetic forces while simultaneously detecting the position of the object in accurate registration with the position of the corresponding electromagnets. In one embodiment constructed according the principles of the present invention, the currents to the electromagnets are controlled by switching amplifiers 20 that switch the amplitudes of the supply voltages applied across the coils of electromagnets L.sub.1, L.sub.2.

Abstract: In a device and a method for regulating an alternator increased alternator output is achieved either in that the exciter current can have a value above the nominal exciter current or in that the alternator control parameters are fixed in such a way that overheating could occur under unfavorable circumstances. In order to prevent this overheating even under unfavorable circumstances, the temperature is measured preferably in the regulator and the temperature at critical locations is determined from this temperature while taking into account typical parameters. This can be effected in that the temperature or temperatures which would occur in stationary operation are first determined. When an impermissible temperature is detected, the exciter current is reduced by suitable steps until the allowable maximum temperature is not exceeded.

Abstract: In a control device for controlling a CPU 11 in accordance with an input voltage which is applied to the CPU and which results from a power source voltage, a first detecting circuit 16 produces a first detection signal when the power source voltage is lower than a first voltage. Responsive to the first detection signal, a switching circuit 21 stops supply of the input voltage to the CPU and the CPU assumes to a waiting state. A condenser 15 discharges an electric voltage in order to compensate a drop of the input voltage. When the input voltage is lower than a second voltage which is lower than the first voltage, a second detecting circuit 17 produces a second detection signal to make the CPU become a reset or an initial state.

Abstract: An induction synchronous motor with two rotor cores and two stator cores includes a rotor having two mutually connected first rotor windings (31,31) of a predetermined number of poles and two mutually connected second rotor windings (33,34) connected of a different number of poles with respect to the number of poles of the first rotor windings; and two stators having two stator windings (21,22) of the number of poles identical with the number of poles of the first rotor windings (31,32) and two excitation windings (41,42) of the number of poles identical with the number of poles of the second rotor windings (33,34). The motor further includes a rectifier circuit (35) for rectifying outputs from the second rotor windings (33,34) and supplying the rectified voltages to the first rotor windings (31,32) at a synchronous operation. A phase shifter (SW1) associated with the first stator windings (21,22) produces a phase difference of 180.degree.

Abstract: A firing control scheme, including a method and apparatus, for secure vernier operation of a thyristor controlled series capacitor (TCSC) in series with a transmission line uses phase controlled firing based on monitored capacitor voltage and line current. The TCSC system has a thyristor switched inductive commutating circuit in parallel with the series capacitor. Vernier operation of the TCSC system is provided by predicting an upcoming firing angle for switching the commutating circuit to conduct a thyristor bypass current pulse therethrough. The current pulse causes an alternating offset component of voltage to appear across the series capacitor, in addition to the normal voltage component. Each current pulse changes the capacitor voltage proportionally to the integrated value of the current pulse.

Abstract: A buck switching regulated power supply having a first feedback loop which is relatively slow, so as to prevent rapid changes in the output current from being reflected to the input current. A second, faster feedback loop having a higher loop gain is provided, and is arranged to take over when the load voltage reaches a predetermined level, so as to prevent the load voltage from rising above such level.