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 eléctrico. 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.

Thus , from the equation 6, Rotor copper losses equal to, But Rotor Gross Output = Rotor input – Rotor copper losses, Rotor gross output = (Rotor input – s) x Rotor input, Rotor gross output/Rotor input = Actual speed of the motor / Synchronous speed, Using the expression (6 and 8), (6+8) gives, Rotor copper losses/Rotor Gross input = s/(1-s). i.e Efficiency of the pump is the ratio water horse power to break horse power. Thus, the output divided by the input can never equal or exceed the unit (100%). Calculate three-phase motor power consumption by multiplying amps by volts by the square root of three (W = AV(sqrt 3). Bhatia, B.E.-2012 Power Factor Requirements for Electronic Loads in California- Brian Fortenbery,2014 http://www.engineeringtoolbox.com. During this power transfer, some losses such as copper losses in stator winding, copper losses in rotor winding, core losses in stator winding, frictional losses and windage losses take place. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. AddThis use cookies for handling links to social media. Multiply Hp (horsepower) by 746. The mechanical power is obtained at the shaft of the motor to perform mechanical work. For this condition, the motor should run at synchronous speed. Google use cookies for serving our ads and handling visitor statistics. title=”Calculadora en linea de HP a kVA” src=”/calculos/Pasar_de_Amp_a_Hp/Amperios%20a%20HP.htm” width=”100%” height=”500″ frameborder=”0″;Su navegador no soporta iframes. Efficiency of DC motor is nothing but ratio of output power to input power. The rotor output of an induction motor is given as follows: Stator output = Stator input – stator losses, Rotor Output = Rotor Input – Rotor copper losses.
It is denominated hp, HP or Hp, of the English term horsepower, expression that was coined by James Watt in 1782 to compare the power of the steam engines with the power of the draft horses. The induction motor receives power from the supply mains through the stator windings. We also show the most common power factors of different motors. AC alternating current is used to power homes, office buildings, commerce, etc. Some of our calculators and applications let you save application data to your local computer. Pump Efficiency is the ratio of pump input and output power. Load adds mechanical resistance. It was later expanded to include the output power of other types of piston engines, as well as turbines, electric motors and other types of machinery. You can target the Engineering ToolBox by using AdWords Managed Placements. Efficiency η = Output power / input power, Construction of Three Phase Induction Motor, Slip Torque characteristics of an induction Motor, Post Comments The old imperial unit horsepower is equal to 746 watts (0.745 kW) or 33000 lb ft per minute (or 550 lb ft per second). Qualify efficiency calculator for electric motor:  [kkstarratings]. E (Efficiency) = The efficiency of the motor is the ratio between the amount of mechanical work performed and the electrical energy consumed to do the job, represented by a percentage.


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