Electric Motors - Efficiency - Calculate electric motor efficiency.

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Efficiency - Efficiency is the ratio useful energy output to energy input.

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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 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.

Motor winding design online