AC/DC Machines

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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


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