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.