AC/DC Machines
Applied Voltage
The speed regulation of DC motor is proportional to the _____
DC Series Motor
has the series field connected in series with the armature
Differential-compound
when the series and shunt field windings in a compound generator are connected in such a way that they oppose each other in the production of magnetism.
Series Motors
Must never be operated under a no load condition.
Field Excitation current
determines the output voltage of the generator.
Interpole Leads
sometimes marked C1 and C2or S3 and S4
Ceiling Fans
Small permanent magnet motors with lightweight rotors are often used as
Commutator
The component of a DC generator that converts the armature AC into DC
ServoDisc
The servomotor with a fiberglass and copper rotor is the _____ motor
Electromagnetic Induction
Generators operate on this principle
Armature
the rotating part of the generator
Differential compound
A compound motor connection that should typically be avoided
Motor
A device that converts electrical energy into mechanical energy
Generator
A device that converts mechanical energy into DC electrical energy
Brushless DC Motor
A motor that does not contain any wound armature, commutator, or brushes.
CEMF
Counter Electromotive Force
Shunt field, armature
In a compound DC motor control circuit, the field loss relay will disconnect the ______ if the power is lost to the ______.
Smoother Output Voltage
Increasing the number of loops and turns produces a
Increase
It is common practice to increase the number of turns of wire for each loop to ____ the output voltage
Higher
Permanent magnet motors have _____ efficiency than conventional field wound motors.
Torque
Proportional to armature current if field excitation current remains constant.
Shunt Field
When a motor is connected in differential compound, the _____ determines the direction of rotation of the motor at no load or light load.
Shunt
When the field winding is connected in parallel with the armature, the motor is called a ____ motor.
Cumulative-compound
When the series and shunt field windings in a compound generator are connected n such a way that they aid each other in the production of magnetism.
Wave-Wound
Winding that provides high voltage and low current
Lap-Wound
Winding that provides low voltage and high current
Frogleg-Wound
Winding that provides moderate voltage and moderate current
Compound Generator
a generator containing both series and shunt fields
Compound Generators
contain both series and shunt fields
Shunt Generator
contains a shunt field winding connected in parallel with the armature.
Compounding
determined by the relationship of the strengths of the two fields in a generator.
Series Generator
has a series field connected in series with the armature.
Compound Motor
has series and shunt field windings
Commutator
maintains the proper polarity of a generator.
Countertorque
makes the armature harder to turn (produced when a generator supplies current to a load). Is also a measure of the useful electric energy produced by the generator.
Series field shunt rheostat
permits part of the current that normally flows through the series field to flow through the resistor.
few, large
series field windings are connected in series with the armature. They are wound with _____ turns of fairly ____ wire.
many,small
shunt field windings are connected in parallel with the armature. They are wound with _____ turns of fairly _____ wire.
S1 and S2
shunt field windings on a generator are called this
Increased
Shunt generators decrease their output voltage when load is
Servomotors
have lightweight armatures with low inertia
Armature Reaction
is caused by the interaction of the magnetic field produced in the armature
Armature Reaction
is the twisting or bending of the magnetic lines of flux of the pole pieces.
A1 and A2
the armature connections on a generator are called this
Constant speed motor
Shunt motors are known as this.
Pole-Pieces
Provide the magnetic field necessary for the operation of the machine
Brushes
Ride against the commutator segments and are used to connect the armature to the external circuit of the DC machine
Increased
Series generators increase their output voltage when load is
Laminated Motor
ServoDisc motor is also often called this