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Multispeed fan motors achieve multiple speeds by inserting additional __________ in series with the run winding.
Windings
The ______ winding is made of many turns of small wire and is located at the top of the stator core.
start
What is the name of the protective device that is connected in series with the shunt field and found on most large compound DC motors?
field loss relay
the items that ride against the commutator to make electrical connection are the
Brushes
most converters that supply power the brushless DC motors produce a ___________ wave
trapezoidal
A compound motor has ______ field windings.
series and shunt
Split-phase motors are so named because they operate on single-phase voltage, but internally they divide the voltage in such a manner to create a _______ magnetic field.
rotating
A device that converts mechanical input into DC electrical output is a;
generator
Armatures are the 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 universal motor has a wound armature and brushes like AC motor. the universal motor has an added component , the
compensating winding
the single-phased synchronous motors are based on the stator of the shaded pole motor. They operate at a speed which is synchronous with the applied frequency. these motors are also called _________ motors.
hysteresis
the Warren motor is a variation of the shaded pole motor. it operates at _______ RPM.
3600
a _______ motor operates on the principle that like magnetic poles repel.
repulsion
in single phase motors such as the resistance start induction run motor, the start windings is disconnected by the
centrifugal switch
What type of motor can develop extremely high starting troque
series
Shunt field windings are connected in parallel with the armature. they are wound with ______ turns or fairly ______ wire.
many, small
Brushless DC motors that require very smooth operation such as grinders that produce a finished surface are powered by _______ waves.
sine
the ________ winding is made of few turns of large wire and is located at the bottom of the stator core.
run
small permanent magnet motors that have lightweight rotors are often used as
servomotors
in a compound generator, the setting of the amount of currents in the series and shunt field windings determines the
compounding
in a universal motor, setting the brushes to the neutral plane can be done by connecting voltage to the armature, a voltmeter to the compensating winding, and adjusting the brush position for a ______ on the voltmeter.
maximum
The output shaft of a stepping motor;
moves through a specific angle for each input pulse
in the shaded pole induction induction motor, the direction of rotation of the magnetic field is;
toward the shading coil
what limits the amount of current flow through the armature when power is the first applied to the motor
armature resistance
servodisc