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UA Electricity 2

UA Electricity 2 Mid Term Review

QuestionAnswer
Motor A device which converts electrical energy into mechanical energy.
Generator A device which converts mechanical energy into electrical energy.
Principle of Operation Operation is based upon magnetism. The motor revolves because of rotating magnetic fields.
Basic Parts of a Motor Stator – Solid electrical housing protecting the windings (in the inner circumference) used to create a rotating magnetic field. Rotor - The part that rotates Shaft and bearings - Supports the system.
Split Phase motor has two (2) electrical windings Start winding: Wound with a fine wire size and has a higher resistance as compared to the Run winding Run winding Wound with larger wire and has less resistance than the Start winding.
Basic Types of Motors Simple split phase motor (No capacitors used) Permanent split phase motor- PSC (Run Capacitor Constantly in circuit) ) Capacitor start - capacitor run (Start cap only used at start, Run cap is continuous during operation
Basic Types of Motors Shaded pole motor (Only one winding, No capacitor) ) Three (3) phase motor (No Capacitors used what-so-ever)
Definition of Torque It is the ability or force applied which is needed to get the motor shaft to rotating. Better Known as: “Rotational Energy”
Characteristics of a Split Phase Motor Low torque starting ability Motor has two windings - Start & Run Application is fractional hp up to 5hp.
Permanent Split Capacitor Motor It has a hp rating of fractional up to 5hp.
Capacitor Start-Capacitor Run Motor *Motor uses a start capacitor to improve starting ability ( increase torque) *and a run capacitor to improve running ability(decrease drag).
Three Phase Motor Motor has very high starting torque. Motor does not require starting relays or capacitors. Hp. rating is from fractional up to 1000’s of hp.
Created by: mikeriv69
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