DC Motors

Question 1

DC Motors

Answer 1

More complex, costly, and require maintenance. Easy to control speed with simple controllers

Question 2

2 Basic Types of DC Motors

Answer 2

Brushed and brushless

Question 3

Brushed Motors

Answer 3

Should run at rated hp/torque. If ran under or overloaded it shortens the brush life.

Question 4

2 types of brush type motors

Answer 4

Permanent magnet

Wound field (series, shunt, and compound)

Question 5

Permanent magnet

Answer 5

Has magnets in stator. The rotating portion is the armature. Gets current from carbon brushes that ride on the commutator. Rated from 1/4 to 5 HP

Question 6

Wound field

Answer 6

Stator has windings that we pass current through to create a magnetic field

3 types- series, shunt, and compound

Question 7

Series wound

Answer 7

Windings in series with the armature. High torque, no speed control, and used for metal rolling and traction drives

Question 8

Shunt wound

Answer 8

Windings in parallel with the armature. They operate from a different power source than armature. Low torque, but great speed control.

Question 9

Compound wound

Answer 9

Have both shunt and series windings. Speed varies little with load, with the ability to increase torque with heavier load. Best of both worlds.

Question 10

Brushless motors

Answer 10

Fixed magnet in the rotor. Stator has a wound field. Capable of high RPMS (1800). 20 HP or below