Abstract: Embodiments of a bidirectional low voltage power supply (LVPS) with a single pulse width modulator and method are generally described herein. In some embodiments, the bidirectional LVPS may include a first converter arranged to provide power from an input power source to a load and a second converter arranged to selectively recycle power from the load at an output of the first converter back to the input power source. Control circuitry may include switching circuitry that may be configured to select either the first power converter or the second power converter for reception of an output of a single PWM.

Abstract: An electric vehicle comprising a drive wheel which is driven by a traction electric motor, a brake command device, a brake releasing unit, a brake shaft, a friction plate, and a braking spring. The brake shaft is rotatable in a brake realizing direction which is one direction by an operation of the brake command device, and is rotatable in a brake releasing direction which is the other direction by driving of the brake releasing unit. The friction plate is operatively connected to the traction electric motor, and is frictionally braked when the brake shaft is rotated in the brake realizing direction. The braking spring applies an elastic force to the brake shaft in a direction to rotate the brake shaft in the brake realizing direction.

Abstract: A method for closed-loop control of a linear drive including a stator, a rotor configured for reciprocating movement along a drive axis therein, and a drive coil through which coil current flows, in particular for a linear compressor including a piston housing and a compressor piston configured for reciprocating movement along a piston axis therein, and driven by the linear drive wherein the coil current is subject to closed-loop control, the method including the steps of determining a target coil current and applying an actual coil current wherein the actual coil current and the target coil current are substantially the same value.

Abstract: A device for generating a motive force includes a tubular housing, a driving member, and a magnetic unit. The driving member is movably disposed in the tubular housing and includes a magnet. The magnetic unit includes first and second magnets, each of which covers a respective one of first and second open ends of the tubular housing. The construction as such permits alternate reversal of a polarity of a magnetic field of the magnet of the driving member to cause reciprocating movement of the driving member in the tubular housing.

Abstract: A controller includes a power source unit, a drive circuit, and a state control circuit. The drive circuit is coupled to the power source unit, and includes a drive coil and a switching transistor unit. The switching transistor unit is operable in one of a circuit-making state for making an electrical circuit between the drive coil and the power source unit so as to enable the drive coil to drive rotation of a rotor of a brushless direct current motor, and a circuit-breaking state for breaking the electrical circuit between the drive coil and the power source unit. The state control circuit is coupled to the power source unit, and includes a pulse width modulator, a sensing coil, and a control transistor coupled electrically in series. The state control circuit controls operation of the switching transistor unit according to magnetic position of the rotor relative to the sensing coil.

Abstract: An alternating current motor may include a rotor configured to rotate about a longitudinal axis, the rotor comprising a diametrically magnetized permanent magnet. Furthermore, the alternating current motor may include stationary coils having a magnetic axis substantially perpendicular to the rotor's longitudinal axis, the stationary coils adapted to the rotor's outer periphery and being substantially coaxial with the rotor's longitudinal axis. In addition, the alternating current motor may include a stator adapted to the stationary coils' outer periphery and being substantially coaxial with the rotor's longitudinal axis, wherein the diametrically magnetized permanent magnet is configured to cause the rotor's oscillation angle to vary no more than 30% between the rotor's oscillation angle at a beginning value of a frequency range of an alternating current in the stationary coil and the rotor's oscillation angle at an ending value of the frequency range of the alternating current in the stationary coil.

Abstract: An electricity distribution network for a motor vehicle, the network having at least two pieces of equipment connected to a storage battery, at least one of the pieces of equipment operates in a pulse mode likely to create oscillations in the network at a resonant frequency thereof, the network includes at least one resistive element and capacitor that are associated in series and that are of resistance and capacitance determined so that the resistance of the resistive element is equal to a damping resistance for the network.

Abstract: An oscillation apparatus includes an oscillation mechanism for reciprocating an oscillating roller which can be rotated in the circumferential direction and can be reciprocated along the axial direction; an oscillation-width adjustment mechanism for adjusting the oscillation width of the oscillating roller; an oscillation-mechanism drive motor for operating the oscillation mechanism; an oscillation-width adjustment motor for operating the oscillation-width adjustment mechanism; oscillation-width controller for controlling operation of the oscillation-width adjustment motor such that the oscillation width of the oscillating roller attains a designated value; and oscillation-number controller for controlling operation of the oscillation-mechanism drive motor, on the basis of the number of revolutions of the plate cylinder, such that the number of oscillations of the oscillating roller per unit number of revolutions of the plate cylinder attains a designated value.

Abstract: An apparatus for driving an electromagnetic load by applying a high voltage at the initial driving stage and thereafter applying a constant hold current is provided with a switch for supplying high-voltage energy to the electromagnetic load from a capacitor for storing high-voltage energy and a control circuit responsive to an electric signal for starting electromagnetic load driving and the output voltage of the capacitor. The control circuit turns the switch on at application of the electric signal and keeps it on until the output voltage reaches a prescribed level. The apparatus of this configuration enables optimum timing of changeover from high-voltage application mode operation to hold mold operation with simple circuitry.

Abstract: A power supply for vibrating compressors comprises a voltage booster circuit portion having voltage changing means for boosting the DC voltage of a commercially available battery and changing the boosted voltage, and an AC voltage generating circuit portion for supplying the boosted DC voltage to the vibrating compressor. The AC voltage generating circuit portion comprises a MOSFET or bipolar transistor for driving a vibrating compressor, a timer IC for generating pulses to cause the MOSFET or bipolar transistor to switch, a forced operation circuit for detecting a timing at which a counter electromotive force generated by the vibrating compressor during the OFF period of the MOSFET or bipolar transistor is recovered to the neighborhood of 0 volts and forcibly reversing the output of the timer IC, and a driver for driving the MOSFET based on the output of the timer IC or a base-current supply circuit for controlling the bipolar transistor.

Abstract: An electrical device which includes axially aligned solenoids and a plunger with two cores, each of which is located at least partially in a respective one of the solenoids. A controller, operated by synchronism with the plunger, is used to energize the solenoids alternately so that the plunger is reciprocated relatively to the solenoids by the action of the resulting magnetic field on the cores. The device may be combined with a pump, particularly a piston pump, to provide a compact, efficient pumping unit which may be submersible.

Abstract: An electromagnetic reciprocating motor or pump for use for providing mechanical force for actuation of other fluids or components, and includes a cylinder provided with closures at each end, at least a pair of electromagnets operatively associated with the cylinder, and surrounding the same, a magnetically responsive piston provided within the cylinder and capable of longitudinal shifting reciprocally within the cylinder upon the sequential energization of the electromagnets, and either a mechanical actuator or electronic triggering components cooperating with electrical circuitry and connecting with the electromagnets which upon energization charging the electromagnets in timed sequence for inducing their reciprocal shifting of the piston within the cylinder means.

Abstract: A power fail circuit provides protection for tape such as used in the tape transport apparatus of a video recorder in the event of a failure of the external power supply. The tape transport apparatus includes as a feature the provision of an electrical error signal used to govern drive motors to maintain substantially constant tape tension when the system is operating normally. After power failure occurs, the power fail circuit continues to respond to the error signal by coupling current from the drive motors to provide dynamic braking. Further, current taken from the drive motors selectively is coupled to an energy storage device operatively associated with the system power supply, to provide augmenting energy from the kinetic energy of the motors for continued control of the power fail circuit as the drive motors are caused to decelerate under control to stop.

Abstract: A circuit for controlling the intermittent application of a dc potential to a device, such as a striker mechanism for a gong, having a member reciprocally moveable between rest and active positions. The reciprocating member shunts and unshunts a capacitor when the member is in its rest position and moved away therefrom, respectively. While the capacitor is shorted, and during its charge time, dc power is applied to the device. When the capacitor is charged to a predetermined potential, dc power is disconnected from the device thereby allowing the reciprocating member to return to its rest position to shunt the capacitor and initiate a new cycle of operation. The system is substantially independent of mechanical characteristics of the device and the current interrupted or made by the contact pair may be at least an order of magnitude less than the peak current in said device.

Abstract: Switch means having a predetermined number of switch positions normally applies any selected one of the same predetermined number of separate control signals to a galvanometer in accordance with the switch position to which the switch means is operated. However, in response to each operation of the switch means between switch positions, a reference signal is applied to the galvanometer for a given time. This overcomes the degrading effect of hysteresis on galvanometer accuracy.

Abstract: A driven body is moved in opposite directions by alternately magnetizing two sets of paramagnetic bodies, each set being located between a drive magnet longitudinally affixed to the driven body and a stationary magnet toward which the magnetized bodies are attracted.

Abstract: A solid state switching circuit for an electromagnetic pump is disclosed herein. The circuit comprises a Darlington amplifier controlling the current flow through the pump's solenoid in response to the state of a piston position sensitive electrical switch, a Zener diode and capacitance in the base circuit of the Darlington amplifier in parallel with the electrical switch and an inductive clamp circuit in parallel with the pump's solenoid coil.

Abstract: A plurality of aligned magnets are movable with respect to each other and their polarities are changed to cause changing of the distances between adjacent magnets by opening and closing of air gaps therebetween. Driven magnets travel a distance which is greater than the air gap between any two adjacent magnets.

Abstract: A switching system for a solenoid reciprocator motor of a type which has a piston arranged to reciprocate into and out of a solenoid. The switch is an SCR rectifier and the trigger lead to close the switch is pulsed by a commutator operating in unison with the movement of the solenoid or a shaft rotated by the solenoid. The energizing cycle when the SCR switch is closed is terminated by a disconnect lead which is pulsed responsive to a subsequent contact of the circuit by the commutator. A preferred mode of pulsing the disconnect circuit is to associate the disconnect circuit with another solenoid of the motor whereby the first solenoid is turned off when the other solenoid is turned on by the commutator.

Abstract: An electromagnetic reciprocating motor is disclosed having a minimum number of moving parts. The motor consists of a hollow, tubular guide having a first drive coil mounted about a first end, a second drive coil mounted about a second end, and a third drive coil mounted about a central portion thereof. A ferromagnetic piston is mounted in sliding engagement within the hollow guide and a ferromagnetic pivot plate is pivotally mounted on the central portion of the guide with a switching means attached thereto for alternately energizing the first or second drive coils.

Abstract: A completely sealed magnetically driven pump having a piston armature driven by electrical windings. Unique electrical driving circuits are provided for the pump embodying feedback windings magnetically coupled with the driving windings of the pump for controlling the reciprocation. The drive circuits are such as to facilitate driving rates, embodying particularly solid state bistable flip-flop components adaptable to be embodied in or associated with computers or other low power logic devices.