Compound Generator
No Load Characteristic
External Characteristic
Observations :
OPERATING CHARACTERISTICS
DC Motors
DC Shunt Motor
Speed-Current Characteristic
Torque-Current Characteristic
Speed-Torque Characteristic
DC Series Motor
Speed-Current Characteristic
or
or
Torque-Current Characteristic
Speed-Torque Characteristic
DC Cumulative Compound Motor
Speed-Current Characteristic
Vt = Ea + Ia (ra + rs) and
Where
Øsh and Øse are respectively the fluxes created by shunt and series field windings
Speed-Torque Characteristic
STARTING OF D.C. MOTORS
Operation
Disadvantage
Four Point Starter
Note:
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5. What are the advantages of DC machines over AC machines? |
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