Fundamentals of Motors - CEU
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The most common device for changing electrical energy into mechanical energy is the electric motor.
The AC motor offers a wide range of speed control.  Voltage is applied to a AC motor and as that voltage is increased from zero to some base voltage, the motor's speed increases from zero to a corresponding base speed.
The most common and simple industrial motor is the three phase AC induction motor, sometimes known as the _____ motor.
To understand how an electric motor works, the key is to understand the principles of _____ .  Drag the correct answer into the box.   
In a direct current motor the electrical contacts to the rotating ring or commutator are known as the _____ .
An electric motor with a squirrel-cage rotor is termed a squirrel-cage motor.
Larger synchronous motors require a separate DC source to be connected to the rotor through brushes and slip rings to provide a magnetic field for the rotor.
An object that possesses mechanical energy is able to work.  Work is done when a force overcomes a _____ .
The construction of a DC motor is considerably more complicated and expensive than that of an AC motor, primarily due to the commutator, brushes, and armature windings.
A _____ is a piece of ferromagnetic material that retains its magnetism after it has been magnetized.