DC Motors

Question 1

What are the two types of DC motors?

Answer 1

Brushed and brushless

Question 2

Two types of brushed DC motors?

Answer 2

Permanent Magnet , Field wound

Question 3

Dc Motor with magnets as the stator, less the 5 HP , rotating member in armature , brushes carry current to copper bars called commutator.

Answer 3

Permanent magnet

Question 4

Three types of field wound motors?

Answer 4

Series , shunt , Compound.

Question 5

Dc Motor with field windings in series with armature, high HP , no speed control , used for traction drives , A leads / S leads

Answer 5

Series motor

Question 6

Dc Motor with
• Windings parallel to Armature
• Helps control overspeeding
• A Leads / F leads
• Air compressors / Hydraulic Motors
• Less torque

Answer 6

Shunt Motor

Question 7

Dc Motor with

• Both Shunt and Series winding
• Good torque, good speed control
• Elevators / cranes
• A Leads / S Leads / F Leads

Answer 7

Compound / stabilized shunt

Question 8

Dc Motor with

• Magnets Mounted in
Rotor
• ALiKe to AC Motors
• UP to 20 HP
• Windings in Stator

Answer 8

Brushless motor

Question 9

How do Dc Motors control speed?

Answer 9

Add or Removing resistance

Question 10

Disadvantage of DC motors?

Answer 10

More costly , more maintenance