Electric Motors
Capacitor Start, Capacitor Run Motor
Single phase induction motor with a capacitor start and run capacitor wired in series with the start winding.
Permanent Split Capacitor Motor
Single phase motor using a single run capacitor in series with the start winding for the motor's entire operation.
Stator
The stationary part inside an electric motor.
Field Windings
Wires wrapped around the field poles of the stator in an electric motor.
Inherent Motor Protection
Protection mechanisms such as magnetically protected and thermally protected.
Power Factor
Ratio of real power to apparent power in an electrical system.
Synchronous Speed
Speed at which the motor's magnetic field rotates.
Hydraulics
Study of fluids in motion and their mechanical properties.
Pneumatics
Study of pressurized gas and its applications.
CSCR Motor Circuit
Circuit consisting of centrifugal switch, run winding, run capacitor, start capacitor, and start winding.
Capacitors
Components causing capacitive reactance in a circuit, opposing the flow of current.
Belt-Driven Compressor
Compressor whose speed can be changed by replacing the pulley with one of a different size.
Hermetic Compressor
Compressor with a motor requiring leakproof electrical connections and special cooling provisions.
Continuous Duty
Current level at which a motor's full-load torque and horsepower are reached.
Electric Motor
Device operating on principles of electricity and magnetism.
Centrifugal Switch
Device whose contacts change position when force applied to weights overcomes spring pressure.
Radiation
Emission of energy as electromagnetic waves or as moving subatomic particles.
Motor-Driven Fans
Fans wired to run when the compressor runs to circulate air around a condenser.
Electromagnetic Field
Field of force associated with the movement of electric charge.
Frame Size
Letter and number designation indicating the physical dimensions of a motor.
Shaded Pole Motor
Low torque, single phase motor with split stator poles wrapped in a copper band to produce starting torque.
Efficiency
Mechanical energy produced by the motor shaft divided by the power input.
Electronically Commutated Motors (ECMs)
Motors with rotors made of permanent magnets instead of coils of wire or metal bars.
Back Electromotive Force
Oppositely polarized voltage induced by the magnetic field in the rotor.
Rotor
Part of an electric motor that rotates and interacts with the stator's magnetic field.
Rotor
The moving part inside an electric motor.
Terminal Box
Where electrical connections are made to control and power the motor.
Induction Motors
AC motors that operate using the magnetic field generated in the stator to induce current in the rotor.
Alternating Current
An electric current that reverses direction at regular intervals.
Polarity
Property of having two opposite poles or directions.
Run Windings
Used for motor starting and additional torque in induction motors.
Start Winding
Winding with higher resistance and inductance used for motor starting.
