Solenoid

About: Solenoid is a research topic. Over the lifetime, 19278 publications have been published within this topic receiving 114721 citations.

Plasma reactor having a symmetrical parallel conductor coil antenna

Abstract: The invention in one embodiment is realized in a plasma reactor for processing a semiconductor workpiece. The reactor includes a vacuum chamber having a side wall and a ceiling, a workpiece support pedestal within the chamber and generally facing the ceiling, a gas inlet capable of supplying a process gas into the chamber and a solenoidal interleaved parallel conductor coil antenna overlying the ceiling and including a first plurality conductors wound about an axis of symmetry generally perpendicular to the ceiling in respective concentric helical solenoids of at least nearly uniform lateral displacements from the axis of symmetry, each helical solenoid being offset from the other helical solenoids in a direction parallel to the axis of symmetry. An RF plasma source power supply is connected across each of the plural conductors.

Miniaturized solenoid operated trip device

Abstract: A solenoid operated circuit breaker trip device has a base defining a guide channel (38) and an actuator (32) that slides in the guide channel and interacts with a contact breaking mechanism (24) having a trip bar (36) operable to make or break electrical contacts. A spring (34) biases the actuator toward the trip bar. A solenoid (28) on the base electromagnetically displaces a plunger (62) along a linear path and is coupled to a trigger (26) having a latching surface (46) that holds or releases the actuator. The guide channel runs parallel to the path of the plunger, adjacent the solenoid. The trigger is L-shaped and pivoted on a pivot pin (52) between two legs (54,56) of its L-shape, on an axis transverse to the path of the plunger. One of the two trigger legs (56) is coupled to the plunger, and the other (54) has an engagement surface that is moved behind a complementary surface (44) of the actuator to selectively block its displacement. The base can be a slotted frame attached to the solenoid or a molded housing having an interior cavity for receiving the solenoid. A return spring (84) urges the trigger toward the latching position.

Method and apparatus for sensing armature position in direct current solenoid actuators

Abstract: An apparatus detects a position of an armature within a solenoid coil by superimposing a fixed frequency sensing signal onto the coil driver signal. The combined signal is applied to the solenoid coil and an alternating current component varies with changes in inductance of the solenoid coil that result from position changes of the armature. A current sensor produces an output signal indicating a level of current flowing through the solenoid coil and a filter extracts the alternating component of that output signal that results from the sensing signal. A position circuit determines the position of the armature from an output from the filter.

Progress on the BIPM watt balance

Abstract: Since beginning the construction early in 2005, considerable progress has been made on the watt balance of the Bureau International des Poids et Mesures (BIPM). We have continued the development of a room-temperature version to test the feasibility of simultaneous force and velocity measurements. Preliminary measurements of the voltage-velocity ratio have been carried out with a reproducibility of the order of 1 part in 104. The coil suspension has been improved to reduce the undesired coil movement in the 5 degrees of freedom different from a perfectly vertical movement. Further work on the current source has reduced its long-term drift to a few parts in 109 per minute with a satisfactory short-term stability. A technique needed to separate the voltage induced in the coil from the voltage drop due to the current flow based on the use of a second noninductive coil has been tested. The second coil is now being integrated into the apparatus. Work has started on the geometrical and magnetic characterizations of a large precision solenoid that will become the reference for the magnetic field alignment. The collaboration with a university on the fabrication of our magnetic circuit is being continued. This paper briefly outlines the main ideas of the BIPM watt balance and reports the progress to date.

Fire extinguishing system

Abstract: An automatic fire extinguishing system for ranges having top burners, including a hood, mountable over the range, tanks containing fire extinguishing fluids remotely located from the hood, solenoid operated valves connected in circuit with heat sensors and power lines to discharge fluid from the tanks when the heat sensors are operated. The range may have electric or gas burners. A solenoid operated switch or solenoid operated valve is connected in circuit with the heat sensors to open the power line to the electrical burners or to open the gas main to the gas burners when the heat sensors operate. An automatically operated exhaust fan and audible alarms are also provided. The system includes manually operable set and reset switch means.