Single Phase Motors Flashcards
What are the five types of single phase motors?
Split Phase
Capacitor Start
Permanent Split
Shaded Pole
Universal Pole
What are the torque and current characteristics of a split phase induction motor?
Weak Touque and High Current
What is the common HP for a split Phase induction Motor?
1/8-1 HP
What are the applications for a split phase induction motor?
Clothes Dryer
Washing Machine
Furnace
What is the construction of the rotor of a split phase induction motor?
It is the same as a Squirrel Cage Induction Motor
What are the parts of the stator of a Split Phase Induction Motor?
Start Winding
Run Winding
Centrifugal Switch
What is the construction of the start winding of a Split Phase Induction Motor?
Longer and thinner wire wound close to core surface
Result- High Resistance
Low XL
What is the construction of the Run winding for a Split Phase Induction Motor?
Shorter and thicker wire wound deeper in core
Result- Low resistance
High XL
What is the function of the centrifugal switch?
Turn off current to the start windings
What is a capacitor in a motor used for?
It is used to increase start torque
How is the capacitor added in a capacitor start motor?
It is added in series with the start winding
What is the result of adding the capacitor?
Increasing phase shift close to 90 degrees
What is the construction of a capacitor start motor?
It is the same as a normal split phase
What is a permanent split phase motor?
The start winding must be larger to handle current so phase shift reduces down to 50 degrees
Is there a centrifugal switch in a permanent split phase motor?
No, both run and start windings are in the circuit at the same time.
