Capacitor-Start, Capacitor-Run Motor
A type of motor which utilizes both start and run capacitor.
Capacitor-Start Motor
A type of motor with a capacitor in the starting circuit.
Split-Phase Motor
A single-phase AC motor that includes a run winding an a resistive start winding that creates a phase-shift for starting
Centrifugal Switch
a switch that opens to disconnect the start winding when the rotor reaches a certain preset speed and reconnects the start winding when the speed falls below a preset value.
Current Relay
A relay that is opened or closed by the starting current of an electric motor. Their main function is starting the motor. Normally Open
DC Converter
A type of rectifier that changes alternating current (AC) to direct current (DC)
DC Motors
are less complex and costly than corresponding AC induction motors. And are more efficient then AC motors.
ECM Motor
An electronically commuted motor. This DC motor uses electronics to commute the rotor instead of brushes. It is typically built for under 1 horsepower.
Electronic Relay
is a solid-state device designed to open the start winding circuit when the design speed has been obtained.
End Bells
The end structure of an electric motor that normally contains the bearings and lubrication system.
Frequency
The cycles per second (cps) of the electrical current supplied by the power company. This is normally 60 cps in the United States.
Full-Load Amps (FLA)
The current a electric motor draws while operating under a full load condition. Also called the run-load amperage and rated low amperage.
Hertz
the unit of frequency. One hertz is one cycle per second.
Induction Motor
An AC motor that has the primary winding (stator) connected to the power supply. Current is induced into a polyphase secondary or squirrel-cage secondary winding (rotor).
Inverter
A device that alters the frequency of an electronically altered sine wave, which will affect the speed of an alternating current motor.
Locked Rotor Amps (LRA)
The current an electric motor draws when it is first turned on. This is normally five times the full-load amperage.
Permanent Split-Capacitor Motor (PSC)
A split-phase motor with a run capacitor only. It has a very low starting torque.
Positive-Temperature-Coefficient Start Device
A thermistor used to provide start assistance to a permanent split-capacitor motor.
Potential Relay
A switching device used with hermetic motors that breaks the circuit to the start capacitor and/or start windings after the motor has reached approximately 75% of its running speed. Normally Closed
Pulse Width Modualator Rotor
An electronic device in a motor circuit that is used to control motor speed for variable-speed motors.
Run Load Amps (RLA)
The amperage at which a motor can safely operate under full load, unless it has a service (reserve) factor allowing more amperage.
Run Windings
Winding in electric motors that has current flowing through it during the normal operation.
Single-Phase Hermetic Motor
A sealed motor, such as with a small compressor, that operates off single-phase power.
Slip
The difference in the rated rpm of a motor and actual operating rpm when under a load.
Squirrel Cage Rotor
The solid rotor in a single-phase induction motor. A rotor with two end rings connected along their circumference with copper or aluminum bars arranged in slots in an iron core.
Start Windings
Winding in electric motor that is used briefly when the motor is starting. The winding in a motor used primarily to give the motor extra starting torque.
Stator
the stationary part of an electrical motor or generator that contains the magnets or induction coils that surround the rotor. The component in a motor that contains the windings, it does not turn.
Three Phase Motor
An induction type of motor that has a very high starting torque and requires no special starting apparatus. simplest and most trouble free and operates on three phase current. reversible, high starting torque, very efficient, no starting mechanism, no com
Torque
a turning or twisting force; the moment of a force; the measure of a force's tendency to produce twisting or turning and rotation around an axis. The twisting force often applied to the starting power of a motor.
Transistor
A small electronic device used in a circuit as an amplifier or switch. An electronic device that can regulate electricity and act as a logical gate or switch for an electrical signal.
Two Speed Compressor Motor
Can be a four pole motor that can be connected as a two pole motor for high speed 3450 rpm and connected as a four pole motor for running at 1725 rpm for low speed. This is accomplished with relays outside the compressor.
Two Pole Split Phase Motor
This motor runs at 3600 rpm when not loaded and at about 3450 rpm when loaded. A four pole motor runs at about 1800 rpm not loaded and at about 1725 fully loaded.
Variable Speed Motor
A motor that can be controlled, with an electronic system, to operate at more than one speed.
Winding Thermostat
A safety device used in electric motor windings to detect over temperature conditions.
stud mounts
studs are bolted to fan guard or housing
rigid cradle belly band stud c-frame unit bearing
some of the more common motor mounts
totally enclosed air over
enclosed type of motors
open drip proof totally enclosed totally enclosed fan cooled
motor encloser types