Motors

Force by which materials exert an attraction or repulsion on other materials.

Substance that produces a magnetic field.

A force produced by a magnet that exerts a force on moving electric charges or on other magnets

A magnet that can hold its magnetism for a long time.

A magnet that retains trace amounts of magnetism after a magnetizing force has been removed.

A measure of the ability of a magnet to retain magnetism after the magnetizing force has been removed.

Invisible lines of force that make up the total quantity of a magnetic field.

The amount of concentration of magnetic flux through a specific area.

Measure of the ability of a material to conduct magnetic flux.

A material that is easily magnetized and with a high permeability.

A temporary magnet produced when electricity passes through a conductor, such as a coil, that concentrates the magnetic field.

The temporary magnetic field produced when electricity passes through a conductor.

The property of a device or circuit that causes it to store energy in an electromagnetic field.

The ability of an inductor in a circuit to generate inductive reactance, which opposes change in the current.

The ability of an inductor (coil) in one circuit to induce a voltage in another circuit or conductor.

Metal tag permanently attached to an electric motor that gives the required electrical ratings, operating ratings, and mechanical-design codes

The voltage level that a motor can use.

The amount of current a motor draws when delivering full rated power output.

The power line frequency at which a motor is designed to operate.

Amount of power a motor can deliver to a load.

The amount of current a motor draws on startup or when rotor is locked. Also known as inrush current or starting current.

A designation for the range Of locked-rotor current draw per motor horsepower.

A description of the expected or allowed application of a motor.

A multiplier that represents the amount of load, beyond the rated load, that can be placed on a motor without causing damage.

The approximate speed at which the rotor of a motor rotates when delivering rated power to a load,

The difference between the synchronous speed and operating speed.

The amount of time a motor can be Operated without being turned Off for cooling.

A measure of the effectiveness with which a motor converts electrical energy to mechanical energy.

The max allowable temperature of the air surrounding an object.

The difference between the Winding Temperature of a running motor and the ambient temperature.

The difference between the ambient temperature and the nameplate ambient temperature rating of a motor.

A code letter signifying the max Operating temperature Of the insulation used in a motor

A number designating standard dimensions Of a motor housing, Shaft, and mounting holes,

A code letter representing a NEMA motor classification for the torque and current curves Of a motor.

The type of protection given to a Motor to Shield the motor from the outside environment as well as protect individuals from the electrical and rotating parts of the motor.

A motor enclosure with openings to allow passage of air to cool the windings

A motor Enclosure that prevents air from entering the motor

A machine component used to reduce friction and maintain clearance between Stationary and moving parts.

A synchronous machine that produces alternating current(AC)

The fixed unmoving part Of a generator, consisting of a core and Windings, that convert energy If a magnetic field to electrical energy

The rotating moving part of an alternator or generator, consisting of a core and windings, that convert torque to magnetic energy

A turning or twisting force that causes an object to rotate.

An alternator Where a magnetic field is created in the rotor, which turns within the fixed stator windings, and AC power is supplied through the stator windings

An assembly consisting of a small three-phase alternator used to supply Current to an alternator rotor

A rectifier assembly mounted on the main rotor shaft along with the exciter generator

An alternator where a fixed magnetic field is created in the stator, with the rotor turning within the Stator, and AC power is supplied through the rotor slip rings and brushes

Are electromagnetic coils that provide the DC for the exciter

The power source used to create the relative motion between the Coil and the magnetic field

A device that indicates Whether two AC sources to be connected in parallel are in the Correct phase relationship

Are found in AC equipment

Are found in DC equipment

AC power

DC power

An AC motor that uses a shaded Stater pole for starting

A short- circuited winding, consisting of a single turn of copper wire, that acts on only a portion of the stator windings

A single turn of copper wire wrapped around part of the salient pole of a shaded-pole motor

A single-phase AC motor that includes a run winding and a resistive start winding that creates a phase-shift for starting

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

A single- phase motor With a capacitor connected in series with the start windings to produce phase displacement in the start winding

A device that stores an electric Charge

A method of starting a motor with the full line voltage placed across the terminals.

A control device that uses pushbuttons that are part of the contactor to energize or de energize the load connected to it

A contactor with an added overload protection device. Manual starters are used in electrical motor starters.

Either the large current at instant of startup when a motor is connected to the rated load or it is a condition when a motor is loaded so heavily that the motor shaft cannot turn

An electrically operated switch that includes motor overload protection.

A method of reduced voltage starting that place a resistor in series in the motor power circuit to reduce the voltage to the motor.

A method of reduced voltage starting that applies a voltage to only part of the motor coil windings for starting and then applies power to the remaining coil windings for normal running.

A motor starter that uses a solid state device, such as an insulated gate bipolar transistor (IGBT) silicon controlled rectifier (SCR), to control motor voltage, current, torque, and speed during acceleration.

A device that provides a gradual voltage increase (ramp up) during AC motor starting.

A method of motor braking in which the motor connections are reversed so that a motor develops a countertorque that acts as a braking force.

A method of braking in which a DC voltage is applied to the stator windings of a motor after AC voltage is removed. Also know on as DC injection.

A method of motor braking where braking energy is dissipated as heat in a resistor as a motor is reconnected to act a s generator immediately after it is turned off.

A method of dynamic braking that reuses the braking energy to the AC source instead of dissipating the energy as heat.