It had a single speed of, and operation of the control contactor was by rods which were fixed to the handle bar.
42.
A type of relay that can handle the high power required to directly control an electric motor or other loads is called a contactor.
43.
When the " start " button is pressed, the motor is not powered directly, rather the electromagnet in the contactor is energized.
44.
NASA believes two electrical ground rods, called plasma contactor units, mounted on the station should take care of any problem with dangerous discharges.
45.
When the contactor coil is de-energized, gravity or a spring returns the electromagnet core to its initial position and opens the contacts.
46.
Improved methods include creating an electron emitter, such as a thermionic cathode, plasma cathode, plasma contactor, or field electron emission device.
47.
The switch may be manually operated or may be a relay or contactor connected to some form of sensor to automatically start and stop the motor.
48.
Smaller sizes of direct on-line starters are manually operated; larger sizes use an electromechanical contactor ( relay ) to switch the motor circuit.
49.
A basic contactor will have a coil input ( which may be driven by either an AC or DC supply depending on the contactor design ).
50.
A basic contactor will have a coil input ( which may be driven by either an AC or DC supply depending on the contactor design ).
