Page 253 - Electrical Engineering Dictionary

stationary magnetic field, negative slip, and bars and in its need for the rotor position in-
braking torque. formation in real time.

electronic motor starter starter in which electronically erasable programmable
solid state devices provide reduced voltage read-only memory (EEPROM) a term
to the motor for starting, thus limiting the used to denote a programmable read-only
starting current. memory where the cells are electronically
both written and erased. Also known as
electronic nonlinear response the non- electrically alterable read-only memory. See
linear optical response resulting from the mo- also electronically programmable read-only
tion of bound electrons. It is characterized memory.
by moderately large response and very short
(several fs) response times. electronically programmable read-only
memory (EPROM) Programmable read-
electronic overload device an overload onlymemorythatiselectronicallywrittenbut
device that employs an electronic circuit requires ultraviolet light for erasure.
to sense motor voltage and current for the
purpose of providing precise motor over- electroplastic effect plastic deformation
load protection. See also overload heater, of metals with the application of high-density
overload relay. electric current.

electronicswitch anelectroniccircuitthat electroplastic smart material material
controls analog signals with digitary (binary) with smart properties of elastic deformation
signals. changes proportional to a controlled electric
current applied in proportion to the sensed
electronic transition alteration in the deformation.
electronic structure of a material such that
one electron temporarily changes its energy electrorheological property property ex-
level through the absorption or emission of hibited by some fluids that are capable of al-
energy. tering their flow characteristics depending on
an externally applied electric field.
electronic warfare contention for the
control of the electromagnetic (EM) spec- electrorheological smart fluid fluid with
trum, to allow active and passive EM sensing smart flow characteristics dictated to change
and communications while denying the same self-adaptively by means of an electric field
ability to adversaries. Includes deceptive EM applied in proportion to the sensed flow pa-
techniques. rameters.

electronically commutated machine a electrorheological smart material ma-
DC machine with rotor-mounted permanent terial with smart properties of elastic defor-
magnets, and concentrated (square) stator mation changes proportional to a controlled
windings. The machine fundamentally be- electric current applied in proportion to the
haves like a DC machine with linear speed sensed deformation.
and torque characteristics, and hence is also
called a brushless DC machine. The ma- electroslag welding a welding process
chine is distinguished from conventional DC that produces coalescence of metals with
machines in its substitution of a six-switch molten slag that melts the filler metal and the
inverter for brushes and copper commutator surfaces of the parts to be joined.

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2000 by CRC Press LLC