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# Chapter 16 DC Machines - PowerPoint PPT Presentation

Chapter 16 DC Machines. Chapter 16 DC Machines. Select the proper motor type for various applications. 2 . State how torque varies with speed for various motors. 3 . Compute electrical and mechanical quantities using the equivalent circuit for dc motors. 4 . Use motor nameplate data.

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Presentation Transcript

Chapter 16 DC Machines

Chapter 16 DC Machines

• Select the proper motor type for various applications.

• 2.State how torque varies with speed for various motors.

3.Compute electrical and mechanical quantities

using the equivalent circuit for dc motors.

4.Use motor nameplate data.

5.Understand the operation and characteristics of

shunt-connected dc motors, series-connected dc

motors, and universal motors.

The DD(X) class of destroyers currently under development by the United States Navy will use an electrical propulsion system. Similarly enhanced electrical-power systems are being developed to provide the electrical power needed for drive-by-wire systems in automobiles.

Basic Construction of Motors the United States Navy will use an electrical propulsion system. Similarly enhanced electrical-power systems are being developed to provide the electrical power needed for drive-by-wire systems in automobiles.

Characteristics of AC Electrical Motors the United States Navy will use an electrical propulsion system. Similarly enhanced electrical-power systems are being developed to provide the electrical power needed for drive-by-wire systems in automobiles.

Characteristics of DC Electrical Motors the United States Navy will use an electrical propulsion system. Similarly enhanced electrical-power systems are being developed to provide the electrical power needed for drive-by-wire systems in automobiles.

Armature and Field Windings the United States Navy will use an electrical propulsion system. Similarly enhanced electrical-power systems are being developed to provide the electrical power needed for drive-by-wire systems in automobiles.

The purpose of the field winding is to set up the

magnetic field required to produce torque.

The armature windings carry currents that vary with mechanical load. When the machine is used as a generator, the output is taken from the armature windings.

PRINCIPLES OF DC MACHINES the United States Navy will use an electrical propulsion system. Similarly enhanced electrical-power systems are being developed to provide the electrical power needed for drive-by-wire systems in automobiles.

Study of the idealized linear dc machine demon-strates how the principles of electromagnetism apply to dc machines in general.

ROTATING DC MACHINES the United States Navy will use an electrical propulsion system. Similarly enhanced electrical-power systems are being developed to provide the electrical power needed for drive-by-wire systems in automobiles.

The basic principles of rotating dc machines are the same as those of the linear dc machine.

Equivalent Circuit of the DC Motor the United States Navy will use an electrical propulsion system. Similarly enhanced electrical-power systems are being developed to provide the electrical power needed for drive-by-wire systems in automobiles.

Magnetization Curve the United States Navy will use an electrical propulsion system. Similarly enhanced electrical-power systems are being developed to provide the electrical power needed for drive-by-wire systems in automobiles.

SHUNT-CONNECTED DC MOTORS the United States Navy will use an electrical propulsion system. Similarly enhanced electrical-power systems are being developed to provide the electrical power needed for drive-by-wire systems in automobiles.

Torque–Speed Characteristic the United States Navy will use an electrical propulsion system. Similarly enhanced electrical-power systems are being developed to provide the electrical power needed for drive-by-wire systems in automobiles.

Separately Excited DC Motors the United States Navy will use an electrical propulsion system. Similarly enhanced electrical-power systems are being developed to provide the electrical power needed for drive-by-wire systems in automobiles.

Permanent-Magnet Motors the United States Navy will use an electrical propulsion system. Similarly enhanced electrical-power systems are being developed to provide the electrical power needed for drive-by-wire systems in automobiles.

Separately excited and permanent-magnet motors have similar characteristics to those of shunt-connected motors.

SERIES-CONNECTED DC MOTORS the United States Navy will use an electrical propulsion system. Similarly enhanced electrical-power systems are being developed to provide the electrical power needed for drive-by-wire systems in automobiles.

Field windings are designed differently for

series-connected machines than they are for

shunt-connected machines.

Universal Motors the United States Navy will use an electrical propulsion system. Similarly enhanced electrical-power systems are being developed to provide the electrical power needed for drive-by-wire systems in automobiles.

• For a given weight, universal motors produce more power than other types.

• 2.The universal motor produces large starting torque without excessive current.

3. the United States Navy will use an electrical propulsion system. Similarly enhanced electrical-power systems are being developed to provide the electrical power needed for drive-by-wire systems in automobiles.When load torque increases, the universal

motor slows down. Thus, the power produced

is relatively constant, and the current

magnitude remains within reasonable bounds.

4.Universal motors can be designed to operate at

very high speeds, whereas we will see that

other types of ac motors are limited to 3600

rpm, assuming a 60-Hz source.

SPEED CONTROL OF DC MOTORS the United States Navy will use an electrical propulsion system. Similarly enhanced electrical-power systems are being developed to provide the electrical power needed for drive-by-wire systems in automobiles.

1. Vary the voltage supplied to the armature circuit

while holding the field constant.

2. Vary the field current while holding the armature

supply voltage constant.

3. Insert resistance in series with the armature

circuit.

Separately Excited DC Generator the United States Navy will use an electrical propulsion system. Similarly enhanced electrical-power systems are being developed to provide the electrical power needed for drive-by-wire systems in automobiles.

Equations for the Separately Excited DC Generator the United States Navy will use an electrical propulsion system. Similarly enhanced electrical-power systems are being developed to provide the electrical power needed for drive-by-wire systems in automobiles.