solenoid

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sol·e·noid

(sol'ĕ-noyd),
A helical coil of wire energized electrically to produce a magnetic field, which induces a current in any conductor placed within or near the coil.
Farlex Partner Medical Dictionary © Farlex 2012

solenoid

(sōl′lĕ-noyd)
A coil of insulated wire in which a magnetic force is created in the long axis of the coil when an electric current flows through the wire. It may be used to activate switches.
Medical Dictionary, © 2009 Farlex and Partners
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They also spent time making and wrapping their own solenoids, which were later used to construct a motor, a generator, and a speaker.
T&X Auto Parts Co., Ltd, a top aftermarket starter solenoid & relay manufacturer, is launching 70 new solenoid switches that cover more than 6,000 vehicles in operation
What we did before is solenoids. Take a rotary solenoid, for instance--pretty simple.
The purpose of the control system is to sense the distance between two walls (platform where the load acts and the base), and there by activate the solenoids to resist the frequent and sudden downward movement of permanent magnets.
To control the solenoid valves I used the Arduino Ethernet microcontroller board.
Three solenoids of lengths 0.25 (S1), 0.50 (S2) and 0.75 (S3) metres, each ~6cm diameter were used in the investigation.
It is a world leader in the making of solenoids - electro-magnetic devices found in a wide range of products from drinks and cash dispensers to lorry air-brakes - and clients have included Hewlett Packard, Mars and Jaguar.
With a World Wide patent pending, the Super Solenoid has already been licensed to the UK's largest lock manufacturer, Squire & Sons, who are developing the next generation of electric lock systems.
Solenoids are known for fast and repeatable linear force or rotary torque produced, and are available with on/off snap engagement or controlled movement.
MAKE SURE YOU PAY ATTENTION TO THE "FUNCTION" WHEN ORDERING THE RIGHT SOLENOID FOR THE EXCAVATOR.
The marking head incorporates plungers (no valves) driven by tiny electric solenoids. To place a dot on the substrate, the plunger is quickly raised and then lowered to release a tiny cylinder of ink.
On the other hand modern technology permits to manufacture traps from permanent magnets with not much smaller values of the magnetic flux density B and one may use a normal solenoid as a magnetic shutter.