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Amps and Voltage - Full load amps, wire and conduit sizes for three phase electrical motors. Three-Phase Electrical Motors - Power vs.Single Phase Power Equations - Power equations for single phased electrical systems.Derating Factor - Increased voltage imbalance and decreased efficiency. Polyphase Motors - Voltage Imbalance vs.NEMA A, B, C and D Electrical Motor Design - NEMA has established the four different designs A, B, C and D for electrical induction motors.NEMA - National Electrical Manufacturers Association - National Electrical Manufacturers Association.Heat Gain from Electrical Motors in Continuous Operation - Amount of heat transferred from electrical motor to ambient room vs.Electrical Motors Service Factor - Service factor - SF - is a measure of periodically overload capacity at which a motor can operate without beeing damaged.of Poles and Frequency - The speed of electrical motors with 2, 4, 6 or 8 poles at 50 Hz and 60 Hz. Synchronous Load - Speed of an operating electrical motor with load is lower than the synchronous speed (no load) of the motor. Electrical Motors - Speed at Operating vs.
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Electric Motor Calculator - Calculate amps, hp and kVA for electrical motors.Efficiency of Small Machine Elements - Friction and efficiency in bearings and roller chains.Efficiency - Efficiency is the ratio between the useful energy output and the energy input.Efficiency - The measure of usefulness.Asynchronous Induction Motors - Electrical Properties - Typical electrical motor data like nominal current, fuse, start ampere, size of contactor and circuit breaker - for asynchronous induction motors.Electrical - Electrical units, amps and electrical wiring, wire gauge and AWG, electrical formulas and motors.NEMA Design B Electrical MotorsĮlectrical motors constructed according NEMA Design B must meet the efficiencies below: Mechanical losses includes friction in the motor bearings and the fan for air cooling. These energies are dissipated as currents in the copper winding, harmonic flux components in the iron parts, leakage in the laminate core. The largest contribution to the stray losses is harmonic energies generated when the motor operates under load. Stray losses are the losses that remains after primary copper and secondary losses, iron losses and mechanical losses. These losses are the result of magnetic energy dissipated when when the motors magnetic field is applied to the stator core. P cl = stator winding - copper loss (W, watts) The copper loss varies with the load in proportion to the current squared - and can be expressed as The electrical power lost in the primary rotor and secondary stator winding resistance are also called copper losses. P in = electric power in to the motor (Watt, W) Primary and Secondary Resistance Losses
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If power output is measured in horsepower (hp), efficiency can be expressed as P in = electric power in to the motor (Watt, W) Electrical Motor Efficiency when Shaft Output is measured in Horsepower If power output is measured in Watt (W) then efficiency can be expressed as Electrical Motor Efficiency when Shaft Output is measured in Watt Electrical motor efficiency is the ratio between shaft output power - and electrical input power.