Thursday, March 19, 2009

Letter Mr

Motor Control Center
A metal structure containing multiple motor control units.
Typically, individual control circuits are mounted in removable
containers, often referred to as pans or buckets.


Motor Insulation Class
Standards established by the National Electrical Manufacturers
Association (NEMA) to meet motor temperature requirements
found in different operating environments. The combination of
an ambient temperature of 40°C and allowed temperature rise
equals the maximum winding temperature of a motor. A margin
is also allowed to provide for a point at the center of the motor’s
windings where the temperature is higher.


Motor Starter

Often refers to a contactor and an overload relay assembled
together to remotely control the operation of a motor while
providing overload protection. This definition applies to a
full voltage starter. A variety of other starter types are also
available.

Mutual Induction
A process that occurs when varying lines of magnetic flux from
one conductor induce a voltage in an adjacent conductor. This is
the basic operating principle of a transformer.

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