Chapter 5 - DC Motor Characteristics

Question 1

Types of DC Motors

Answer 1

1. ) Shunt
2. ) Series
3. ) Compound (A Combination of Shunt & Series)

Question 2

Explain why a Series DC motor should not be started on no Load?

Answer 2

If a Series Motor is started with no load the motor could reach a critical speed causing Major Damage.

Question 3

Describe a Shunt DC Motor

Answer 3

• Field Winding’s are in Parallel with the Armature.
• this keeps current flow through the field winding uneffected by current change through the armature with varying loads.
• so Torque developed varies directly with Armature Current

Question 4

Describe a DC Series Motor?

Answer 4

• Field winding in this motor are in series with the Armature.
• Field Windings consist of less turn than a shunt motor but windings are made with thicker/heavier wire.
• because of the series layout changes in armature current also effects current flowing through the Field Winding’s

Question 5

Describe a DC Compound Motor

Answer 5

• This type of motor consist of both methods of Series and Shunt Motors.
• so two field windings in the Circuit one in Series and on in Parallel with the Armature.