Identifying Windings
The windings of a DC motor can be identified with an ohmmeter. The shunt field winding can be identified by the fact that it has a high resistance as compared to the other two windings. The series field and armature windings have a very low resistance. They can be identified, however, by turning the motor shaft. When the ohmmeter is connected to the series field and the motor shaft is turned, the ohmmeter reading will not be affected. When the ohmmeter is connected to the armature winding and the motor shaft is turned, the reading will become erratic as the brushes make and break contact with different commutator segments.
Related posts:
Other Digital Audio Devices:DAM CD
POLYPHASE MACHINES
Transformer:Why Transformer Rating in kVA ?
bipolar Transistors:Transistor Construction
Capacitance:capacitors
Motor Speed Control Systems-Varying the Speed of a DC Shunt Motor
LOSSES IN INDUCTION MACHINES
Feedback Control Theory Continued:Important Features of Root Locus
power Supplies:filter circuits
Basic troubleshooting principles:Checks for circuit continuity with disconnected supply
THREE-PHASE DRIVE SYSTEMS FOR DC MOTORS
Fuel System – Carburetor Service (part1)
MULTIPLE PUSH-BUTTON STATIONS
AUDIO AND VIDEO SYSTEMS – MONOCHROME TV STANDARDS AND SYSTEMS