generators
A device that converts mechanical input into DC electrical output is a(n)
generator
A device that converts electrical input into mechanical output is called
motor
Small permanent magnet motors that have lightweight rotors are often used as
servomotors
A generator containing both series and shunt field windings is called a ____ generator.
compound
Armatures are wound to provide high voltage, high current, or some specific combination of voltage and current. The winding that provides low voltage and high current is the ____ wound.
lap
The rotating part of a generator is called the
armature
The DC motor, known as a "constant speed motor," is the ____ motor.
shunt
The servomotor which has a fiberglass and copper rotor is the ____ motor.
ServoDisc
A compound motor has ____ field windings.
series and shunt
In a generator, the series field diverter is also called the
series field shunt rheostat
The component of a DC generator that converts the armature AC into DC is the
commutator
The motor that does not contain a wound armature, commutator, or brushes is the ____ motor.
brushless DC
Because the rotor of the ServoDisc motor is made from copper laminated onto a fiberglass disk, the motor is also called a ____ motor.
printed circuit
The compound motor connection that is rarely used is the
differential
The speed regulation of a DC motor is proportional to the
armature resistance
The items that ride against the commutator to make electrical connection are the
brushes
Permanent magnet motors have ____ efficientcy than wound field motors.
higher
Some DC servomotors have square wave input voltage. To vary the motor speed, the on and off time ratio of the square wave is varied. This is called ____ modulation.
pulse-width
The cumulative compound motor connection means that the fields of a series and shunt field windings
add
List the three basic types of DC motors.
series, shunt, compound
The output voltage of the series generator is set when the load is
connected
When full voltage is applied to both the armature and the shunt field, the motor operates at
base speed
Most converters that supply power to brushless DC motors produce a ____ wave.
trapezoidal
In a compound DC motor control circuit, the field loss relay will disconnect the ____ if power is lost to the ____.
armature, shunt field
When a DC machine is used as a motor what function does the commutator perform.
It acts as a rotary switch and maintains the correct direction of current flow through the armature.