An alternating pressure valve system is provided comprising a blower with an air intake and an air outlet; a rotor valve assembly connected to the air outlet from the blower where the rotor valve assembly comprising: a housing with an air intake, a first air outlet, a second air outlet, and a circular chamber; and a wedged shaped rotor valve rotatably contained within the circular chamber of the housing such that the rotor valve can rotate to partially block the first air outlet, partially block...

The invention concerns an AC electric motor (1) comprising a stator magnetic circuit including a first part (2) whereon are mounted electrical windings (7 and 8) and a second recessed part (10) wherein is mounted a rotor (14). The invention is characterized in that the first part (2) of the stator magnetic circuit and the electrical windings (7 and 8) are mounted inside a stator chamber (20) with sealed wall, the second part (10) of the stator magnetic circuit, the cylindrical rotor (14) being l...

Method and apparatus for alternately providing positive and negative direct current voltages to a single twisted pair includes a power source configured to provide a first signal and a second signal, the first and second signals having different polarities, a controller configured to provide a control signal in accordance with a predetermined timing signal, and a voltage alternating switch circuit having first and second output terminals, the voltage alternating switch circuit coupled to the pow...

A limiter circuit for alternating voltages includes a pair of zener diodes arranged in series but in opposite sense. Each zener diode forms an additional current mirror with a respective further transistor so that for each of the two possible directions of the limiter current it is possible to derive a limiter signal current which is decoupled from the actual limited current and which, unlike the actual limiter current, always flows in the same direction. Such a limiter circuit can be used in th...

An alternating current conditioner is provided with a magnetic structure that provides smoothing, transient suppression, ride through and power factor correction. The structure has a gapped magnetic core and primary and secondary windings. A shunt is provided between the primary and secondary, with the gap being on the primary side. A capacitor is in series with the secondary winding. The capacitor and the shunt inductance provide an LC low pass filter. The inductance caused by the gap cancels t...

The generator comprises a stator core 4 in which a three-phase stator coil 5 is wound and inserted into slots, a first rotor core 8 and a second rotor core 9 which are provided in the side of an inner diameter of this stator core 4 and rotate with a rotating shaft 7, a field coil 10 for magnetizing these first and second rotor cores 8 and 9 in different magnetic poles, and a plurality of magnetic poles 23 and 24 which are provided so as to extend to an axial direction of the rotating shaft 7 fro...

An alternating current contactor has an armature to be actutated by a magnet system. The armature is operatively connected to a return spring-loaded contact base holding movable contact parts of the contact system. The contact base is here provided with a supplementary mass and brought into operative connection with the armature via a coupling spring, the supplementary mass being movable relative to the contact base and an additionally provided intermediate part to which the armature is coupled....

In one embodiment this invention provides vinylidene copolymers with alternating monomeric units as illustrated by the following structure: ##STR1## An invention vinylidene copolymer in the form of an electret film exhibits a high level of longitudinal piezoelectric effect, and has excellent processability and thermal stability properties.

An alternating current relay including a wire coil having the wire wrapped in the same direction to form a wire coil having substantially parallel windings with the wire coil also being connectable to an alternating current source. The wire coil includes a central passage extending in a direction substantially perpendicular to the direction of the wire windings, wherein a cylindrical core extends through the central passage of the wire coil and further extends through the top surface of the coil...

A phase shifting mask for use in lithographic processing of semiconductor substrates comprises a mask substrate substantially transparent to the energy beam used and a patterned phase shifting layer disposed on the mask substrate and having openings therein exposing the mask substrate. The patterned phase shifting layer is comprised of a material of differing composition than the mask substrate and is of thickness sufficient to shift the phase of an energy beam passing through the thickness of t...