Single Phase Flashcards
When are single phase ac motors used
when no three phase is available and in under 1 hp applications
What are the three categorys of single phase ac motors
series,induction, syncronous
What are some charateriscitc of single phase
Simular to dc series, less field turns and laminations
has a communtator and brushes
Same armature polarity so armature rotates one direction
no shunt beacuse not enough torque created
How do you reverse single phase ac motor
reverse the start windings to reverse the motor.
Name this ciruit and its fuctions and uses
Capacitor start motor
Higher start torque than split resistive motor
used in fridges, air conditioners
Name this circuit and its functions and applications
resistive split phase motor
Windings have different amounts of resistance to cause phase difference
Used for easily-started loads: fans, woodworking tools, grinders, oil burners – rarely found in sizes over 1/3 hp.
Name this and app
Permanent-Split Capacitor Motor
Uses an oil filled capacitor permanently connected in the circuit
Less starting torque than capacitor-start motor but runs smoother and more efficient
Used in sizes less than 1/3 hp
name this and app
Two-Value Capacitor Motor
Oil-filled electrolytic capacitors selected for optimal starting and running
Used in applications that require larger motors that have to start high-inertia loads
Name the induction motor type single phase
- Resistance-Start Split Phase Motor
- Capacitor-Start Motor
- Permanent-Split Capacitor Motor
- Two-Value Capacitor Motor
- Shaded-Pole Motor
Name this
Universal Motor Controller
name this
Single Phase Induction Motor Controller
When are single phase syncronous motros used
Synchronous Motors are used for their constant-speed characteristics
Name the three rotor types of syncronous single phase motors
- DC-Excited – DC applied to rotor
- Reluctance Type – modified squirrel cage rotors with salient poles – very low pull-out torque
- Hysteresis Motor – rotor made of permanent magnet steel
