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| Capacitor-Start Capacitor -Run Motor | A single phase motor with that has a start capacitor in series with the start winding that is disconnected after start-up and a run capacitor that is also in paralell with the start windings that stays in the circuit while running. This capacitor is built for full-time duty and uses the potential voltage generated by the start winding to give the run winding more efficiency. |
| Capacitor-Start Motor | A single phase motor with a start and run winding that has a capacitor in series with the start winding, which remains in the circuit until the motor gets up to about 75% the run speed |
| Centrifugal Switch | A switch that uses a centrifugal action to disconnect the start windings from the circuit |
| centrifual | a force which makes things move away from the center of something when they are moving quickly around that center |
| Current Relay | An electrical device activated by a change in current flow |
| DC Converter or rectifier | A device for changing alternating current to direct current |
| DC Motors | Variable speed motors that are typically much more complicated to work with because they have both a field (stator) and a armature (rotor) winding and use brushes to carry power to the rotor |
| ECM Motor | Instead of brushes rubbing on an armature, the motor is electronically commutated. This motor would be applied to a fan application as it is a fractional horsepower motor. |
| Electronic Relay | A solid state device designed to open the start winding circuit when the design speed has been obtained. It is used with some motors to open the start windings after the motor has started |
| 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 electical current supplied by the power company. This is normally 60 cps in the United States |
| Full-Load Amps (FLA) | The current an electic motor draws while operating under a full-load condition. This is also called run-load amperage and rated-load amperage |
| Hertz | Cycles per second |
| Induction Motor | An alternating current motor where the rotor turns from induced magnetism from the field windings |
| 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 |
| Pulse Width Modulator | An electronic device in a motor circuit that is used to control motor speed for variable-speed motors |
| Rotor | The rotating or moving component of a motor, including the shaft |
| Run Load Amps (RLA) | The amperage at which a motor can safely operate while under full load, unless it has a service (reserve) factor allowing more amperage |
| Run Windings | The electical winding in a motor that draws current during the entire running cycle |
| 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 the actual operating rpm when under a load |
| Squirrel Cage Rotor | A rotor constructed by bars |
| Start Windings | The winding in a motor used primarily to give the motor extra starting torque |
| Stator | The component in a motor that contains the windings; it does not turn |
| Three-Phase Motor | Very efficient motors that require no start assist for hig-torque applications |
| Torque | The twisting force often applied to the starting power of a motor |
| Transistor | A semiconductor often used as a switch or an amplifier |
| Two-Speed Compressor Motor | It can be a four-pole motor that can be connected as a two-pole motor for high speed (3,450 rpm) and connected as a four-pole motor for running at 1,725 rpm for low speed. This is accomplished with relays outside the compresor |
| Two-Pole, Split-Phase Motor | This motor runs at 3,600 rpm when not loaded and at about 3,450 rpm when loaded. A four-pole motor runs at about 1,800 rpm not loaded and at about 1,725 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 |
