Figure 7 shows a power analyzer display supporting "Method A" from the IEEE 112 standard in which all mechanical power is divided by the total input to the motor. kVA to Hp – Conversion, equation, table, convert and calculator free. power (kW) speed (rpm) 1 hp = 0.746 kW - power converter; 1 lb ft = 1.355 Nm - torque converter; Electric Motor - Power vs. Torque and Speed. The output power is a mechanical power. This calculator takes shaft output power in Horsepower or Watt to calculate the electrical motor efficiency. For an ideal case, assuming no copper losses in the rotor circuit. Electrical motor efficiency is the ratio between output power measured at motor shaft and the input power given to the motor. The other losses on the rotor side are friction losses at bearing and slip rings etc and the windage losses. The input power is electrical power. Iac = The alternating current is described as the load flow that changes direction periodically, resulting in the voltage level also reversed in conjunction with the current. τ ind = P / ω m. τ ind = Induced torque in Nm. I L = S start / (√3 * V T), Shaft power produced from an alternating current (AC) electrical motor: Pshaft_kW = ηm U I PF / 1000               (1b), Pshaft_kW = ηm 2 U I PF / 1000                  (1c), Pshaft_kW = ηm 1.73 U I PF / 1000                  (1d), Pshaft_hp = Pshaft_kW / 0.746                      (2), The shaft power produced by an electric direct current motor with 36 V, 85% efficiency and 5 amps - can be calculated in watts as. With this efficiency calculator for motos you can convert and calculate online automatically in only 3 step, easy, fast and free any power associated with electric motors. Multiply the AC line-to-line voltage by the square root of 3, the power factor and the motor current. Input Voltage provided to the motor armature can perform the following two tasks: Obtain control on Back E.M.F “E b ” of the Motor. es: vatios de potencia de motor elÃ©ctrico. The frequency of the rotor current depends on the slip or speed of the rotor (f, Rotor copper loss is determined by using the formula 3I, Stator copper loss is calculate by using the formula 3I, Input to the motor on load is equal to √3V. The output power is a mechanical power. Where; P is the number of poles. The induction motor receives power from the supply mains through the stator windings. Electrical motors constructed according NEMA Design B must meet the efficiencies below: 1) NEMA Design B, Single Speed 1200, 1800, 3600 RPM.