Abstract: A rotary-arm drive includes a wobble-absorbing magnetic bearing (WAMB). One end of the arm engages a load-carrying surface. The other end rotates with a power-carrying rotary shaft. The arm transmits power at least one way between surface and shaft. The WAMB is between the first end of the arm and the surface.As to one aspect of the invention, the WAMB directly transmits force mechanically, but absorbs mismatched motion, between end and surface. Preferably the bearing has at least two elements (more preferably rolling elements, ideally balls) fastened to neither the end nor the surface.As to a second aspect, the drive is a traveling antirotation module. The first end rides on a fixed guideway that defines the surface; the other is fixed to a mechanical element forming the shaft and travels, carrying the arm, along a drive direction and is subject to undesired rotation about the axis. Thus the arm and its engagement with the guideway help restrain the element against rotation.

Abstract: In a motor having a rotation detection sensor, a Hall IC device for generating an output signal indicative of rotation of a motor rotary shaft is accommodated within a casing. The casing is formed into a longitudinal shape, and is sandwiched between a motor and housing attached to the motor. The casing extends perpendicularly to the rotary shaft in the housing.

Abstract: A motor having permanent magnets received therein includes a rotor having a plurality of circular sheet irons deposited in turn, a plurality pairs of magnet receiving slots formed through the deposited sheet irons at a predetermined angle toward the outer surface of the rotor, and permanent magnets of different polarities received into the magnet receiving slots, wherein a magnetic flux leakage preventive groove having a predetermined width and depth is formed at the outer surface of the rotor at the center between the pair of magnet receiving slots.

Abstract: The present invention relates to a brake device with a combination of power-generating and eddy-current magnetic resistance having an outer ]-shaped fly wheel fastened on a central axle of a frame and fitted with a permanent magnet on the inner circular edge to form a rotor type, and the fly wheel is connected with a stator core fastened on the frame; moreover, one end of the central axle is stretching out of the frame and fitted with a belt wheel; the front end of the frame is fitted with a brake core adjacent to the outer edge of the fly wheel to supply a planned eddy current magnetic resistance to the fly wheel; in accordance with such design, the device generates power by means of the exercise force of users to drive the fly wheel to rotate, after passing through a DC power supply, it provides display & controlling gage with power source so that the power-generating and the eddy current magnetic resistance are integrated to reach the effect of reducing the volume and the producing cost.

Abstract: A reluctance machine including a plurality of phase windings where each phase winding comprises a plurality of fractional-pitched coils. The reluctance machine may be coupled to a drive that can energize one, two or more of the phase windings to provide output torque that is derived from: (i) the self-inductances of the phase windings; (ii) a combination of the self-inductances of the phase windings and the mutual inductances between the phase windings; or (iii) the mutual inductances between the phase windings.

Abstract: A section of the rotor of an electric motor includes a Neodymium plastic bonded magnetic material annulus having a plurality of permanent magnets having magnetic poles alternately disposed thereon and pressed onto the periphery of a plastic disc. The annulus is magnetized to provide thirty six evenly spaced similar permanent magnets with their north and south poles alternately disposed along the periphery of the rotor section. Five rotor sections are provided to provide the rotor. Each rotor section is coaxially connected to the shaft of the electric motor. A stator of the electric motor preferably has five stator sections with each having thirty two stator coils that each have one end proximal to the periphery of the annulus. Each stator of the electric motor is disposed about a corresponding rotor section and separated therefrom by an air gap.

Abstract: The present invention relates to an arrangement in a bulb generator (G), comprising a generator housing (1, 10, 110, 210, 310, 410) arranged in a water flow for letting turbine water flow there along and towards the turbine (4), which arrangement comprises means for removing surplus heat generated during operation of the generator, which mean comprise elements which are assembled as flow channels for coolant and/or heated generator air for indirect or direct cooling of the generator air, and for the purpose of providing a cooling system which to a large degree is independent of the quality of the river water or turbine water, and which also comprises elements which are non-costly as regards manufacturing and assembly, it is according to the present invention suggested that said means (111; 411) comprise, as known per se, extruded elements, especially elements which either comprise channels or by assembly define channels (112; 412) for circulating coolant, especially circulating air, or any other appropriate c

Abstract: In a motor having a permanent magnet built in a rotor, a hole for preventing a short-circuit of magnetic flux is disposed so that the hole is adjacent to the outer rim of rotor core, and adjoins to a slit for receiving a permanent magnet as well as the permanent magnet per se. This structure prevents a short-circuit of magnetic flux generated by both ends of the permanent magnet, and the magnetic flux at both ends of the magnet can flow to a stator, thereby contributing to generate torque effectively. As a result, the highly efficient motor with less cogging torque, less vibration and lower noise can be provided.

Abstract: An electromagnetic thrust bearing having reduced windage losses, improved structural integrity, and enhanced electromagnetic flux density. The present invention provides an electromagnetic thrust bearing having a first annular stator segment and a second annular stator segment joined thereto to define an annular electromagnetic coil chamber having an L-shaped cross-section. By employing first and second stator segments, the electromagnetic coil can be precision wound onto one segment without interference from the other segment, and then the two segments can be joined after the precision winding has been performed. The first segment is joined to the second segment at a location remote from the stator poles to thereby provide a more structurally sound assembly able to better withstand loads imposed thereon. The stator segment pole faces include axially extending lips to maximize electromagnetic flux density and thus load carrying capacity.

Abstract: A method of controlling switching of a tri-state switching amplifier having two switching legs, two switches in each leg, and a load connected to the junction between the switches of each leg, a power supply and a capacitor connected to the opposite ends of each leg, a first pair of the switches defining an idle state in which current circulates through the load and the first pair of switches, a second pair of the switches defining a Charge state in which the load is connected to the power supply and current through the load increases and a third pair of switches defining a Discharge state in which the load is connected to the power supply and current through the load decreases, the method comprising generating a first PWM signal at the beginning of each pulse of a clock signal; generating a second PWM signal when a binary current error signal changes state; generating, at the beginning of each pulse of the clock signal, a Direction signal which is the inverse of the current error signal; and placing the ampl

Abstract: A fan clutch (A') includes an eddy current drive (224) having a first, magnetic field producing drive component rotatable with the output and a second, coupling drive component rotatable with the input in the form of a sheave (50'). The first drive component includes permanent magnets (226). The second drive component is of a one-piece construction including a steel ring (238) embedded in a body portion (241) formed of aluminum. The steel ring (238) includes locating ears (310) for properly locating and retaining the ring (238) in a mold half (324). Positioning tabs (312, 314) extend from the faces (302, 304) of the ring (238) and prevent the ring (238) from floating in the volume between the mold halves (318, 324) which forms the body portion (241) during the introduction of the molten aluminum. The body portion (241) is integrally formed with circumferentially spaced air moving vanes (264) and an annular disc portion (260) for mounting to the sheave (50').

Abstract: A robot having a pair of magnetic couplings that each couple a motor in a cylindrical first chamber to an associated cylindrical ring closely spaced from the cylindrical wall of said first chamber. The robot includes a mechanism to convert rotation of each of these rings into separate motions of the robot. In the preferred embodiment, these separate motions are radial and rotational.

Abstract: A permanent magnet D.C. torque motor has the stator mounted in cantilever from a base and nested in a cup-shaped rotor journalled for rotation on the base. The permanent magnets are disposed about the inner periphery of the rotor. The stator core has a plurality of radially outwardly directed webs with coils therearound and may be formed integrally as one-piece or laminated. The pole segments may be integrally formed with the web or attached as separate members. The pole segments have truncated cylindrical pole shoe surfaces forming radial air gaps with the rotor magnets. The pole segments extend axially and transversely beyond the webs. The axial pole segment extensions provide increased total flux for a given motor volume without an increase in ampere turns of electrical energization. The motor of the present invention is particularly suitable as an engine air throttle actuator.

Abstract: A medical ultrasonic generator having an ultrasonic radiator wound with coils connected to a high-frequency oscillator, when the radiator is provided with a sintered element consisting essentially of Ni--Zn having a thickness of 8 to 20 mm. The ferrite element can effectively apply the ultrasonic oscillation to a human body to improve the effect of medical treatment. Further, the medical ultrasonic generator is superior in terms of workability as a medical treatment because of its ability to effectively apply the ultrasonic oscillation to the affected part even through the clothing worn by a patient.

Abstract: A rotary induction machine having wound primary and secondary windings with resistive means connected in series with secondary windings and inductive reactive means connected across said resistive means, with the inductive reactance means and resistive means selected to provide an effective resistance which controls the current in the generator secondary windings, whereby the generator rated current is reached at the highest slip for the range of desired power output.

Abstract: A motor having an external rotor, or "inside out motor" has a split C arrangement of ferromagnetic members which function as the poles of the electromagnet in the motor. The ferromagnetic members are generally C-shaped and mounted on opposite end caps of the motor. The ferromagnetic members on the opposing end caps are angularly offset from each other. The ferromagnetic members on each end cap are also spaced apart from each other, and receive a portion of the motor windings within them. The motor is constructed for assembly using few or no separate fastening devices to secure the components together. In one embodiment, a bearing core serves as the base on which all parts are assembled.

Abstract: An amplifier for systems affected by changes in operating temperature, in which the amplifier gain is stabilized over temperature. A temperature compensating control element is added to the previously known active bias control amplifiers, forming a second control loop. This control acts to modify the device bias current, in a way which holds the device gain constant as temperature varies. In so doing it implements, in the circuit, the mathematically derived current variation which, based on the physics of the device, maintains constant gain. The additional circuitry is very inexpensive, preserving the cost-effectiveness of the integrated circuit bias scheme for those applications requiring the additional bias control.

Abstract: A circular low noise amplifier package having an X-band MMIC low noise amplifier disposed therein, that may be preferably used with an existing stripline receiver board employed in a missile. The package has three input/output ports symmetrically located around the package, including DC bias, RF input, and RF output ports. The package mounts directly into the stripline receiver board as a drop-in replacement for an isolator used in the existing stripline receiver board. The circular low noise amplifier package comprises a top cover, an upper RF gasket, a package lid, a hermetic low noise amplifier module containing a low noise amplifier chip, a lower RF gasket, and a bottom cover. The amplifier module has feedthrough pins that extend through the outer wall thereof and couple to the low noise amplifier chip. The top and bottom covers are used to secure the amplifier package to the stripline receiver board. The upper and lower RF gaskets aid in improving an RF ground.

Abstract: The stator disc (18) of the motor (2) of a disc motor type elevator machinery is s provided with an annular cavity (19a) in which the stator (9) is placed. The stator (9) is attached to one of the walls of the cavity. The rotor (13) is placed in a rotor disc (12). Between at least one (28a) of the walls of the cavity (19a) and the rotor disc (12) there is a sealing (26a) which seals the cavity so as to render it a closed space. The sealing blocks the entry of external particles into the rotor and stator.

Abstract: A method of biasing an MOS IC includes the steps of providing the IC with two MOS transistors having substantially similar characteristics and maintaining these two transistors at different temperatures. During operation of the IC, an output voltage is generated from each of the two transistors, and a bias voltage is generated as a function of the difference between the two output voltages. This bias voltage is then fed back to the gate terminals of the two MOS transistors to set the bias voltage to a steady-state level at which the circuit will operate at a zero temperature coefficient point. This bias voltage is also coupled to the gate electrodes of other transistors within the IC, to operate these transistors at the zero temperature coefficient point. An IC operated in accordance with biasing method will exhibit superior stability with variations in ambient temperature.