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NCCER Electrical Module 2 Level 2 Motors: Theory and Application With 100% CORRECT ANSWERS
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NCCER Electrical Module 2 Level 2 Motors: Theory and Application With 100% CORRECT ANSWERS
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JACKLINENCCER Electrical Module 2 Level 2 Motors: Theory and
Application With 100% CORRECT ANSWERS
Terms in this set (74)
Magnetic lines of force are continuous and always form closed loops; Magnetic lines of force
How DC motors operate?
do not cross.
Armature: (Definition) The rotating windings of a DC motor.
The __ is a movable electromagnet located Armature
between the poles of another fixed permanent
(field) magnet as shown.
A twisting force called must be developed. Torque
_____ is produced by mounting a loop in a fixed
magnetic field and as long as the fields of the
magnet and armature interact.
Commentator: (Definition) A device used on electric motors or generators to maintain a unidirectional current.
NCCER Electrical Module 2 Level 2 Motors: Theory and Application
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, In the neutral plane, no ___ is produced and the Torque
rotation of the armature should stop
A ___ is produced by the fields poles, and a Magnetic field
loop of wire in the armature turns and cuts this
magnetic field.
CEMF Counter electromotive force (CEMF)
The rated output capacity of the motor. It is based on breakdown torque, which is the
Horsepower: (Definition)
maximum torque a motor will develop without an abrupt drop in speed.
Horsepower: (Equation) Hp= Watts/746
Shunt
Types of DC motors Series
Compound
Types of AC motors Synchronous and Induction (Single and Polyphase)
Periodic duty: (Definition) Intermittent operation at a substantially constant load for a short and definitely specified time.
The approximate full-load speed at the rated power line frequency. The speed of a motor is
Revolutions per minute (rpm): (Definition)
determined by the number of poles in the winding.
For single-phase motors, the standard rotation, unless otherwise noted, is counterclockwise
Rotation: (Definition) facing the lead or opposite shaft end. All motors can be reconnected at the terminal board for
opposite rotation unless other wise indicated.
The speed of the revolving field of the stator, which is dependent on the supply frequency and
Synchronous speed: (Definition)
number of poles in a stator winding.
Field poles: (Definition) The stationary portion of a DC motor that produces the magnetic field.
The name of the motor part that rotates during Armature
operation is the ____.
The principle reason for developing the eliminate commutator problems
brushless DC motor was to ___.
The electrical energy required to produce 1hp of 746W
mechanical energy is __ _.
NCCER Electrical Module 2 Level 2 Motors: Theory and Application
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