Electric Motor Rpm Formula

Hence motor torque t p ω.

Electric motor rpm formula. In our example input electrical power of the motor is 0 22 a x 6 v 1 32 w output mechanical power is 1000 rpm x 2 x 3 14 x 0 00126 n m 60 0 132 w. Electrical motor power velocity and torque equations. For dc motor torque formula. Rpm 120 frequency of poles in the motor.

Motors run at a specific revolutions per minute rpm and a speed reducer is needed if you want to keep that motor but have a lower rpm. Check the circle next to the item you are solving for and enter the remain three items in the spaces provided. Dc controls adjust speed by varying the voltage sent to the motor this differs from ac motor controls which adjust the line frequency to the motor. Below is a small calculator that will solve the ratio for you.

For calculating torque for dc motor. Poles number of poles of your motor. 60hz is the most common frequency in the us. T ftlb p hp 5252 n 1b.

The speed of the motor can be found by using speed measurement devices. 50 x 60 x 2 6 000 no load rpm ã number of poles. Note that when an ac motor is loaded the spinning magnetic field in the stator does not change speed. I input dc current.

Hz frequency or cycles sec. T inlb p hp 63025 n 1. V input dc voltage. So for example if you have a 4 pole motor on 60 hz then rpm 60 2 4 60 1800 rpm.

Per hp at 1200 rpm a motor develops a 4 5 lb ft. N revolution per minute rpm alternatively. 50hz is the most common frequency outside the us. Acthree phase induction motorrpmis determined by the formula.

T inlb torque in lb f. Rpm shaft rotation speed or revolutions per minute. P hp horsepower delivered by the electric motor hp. At no load you have maximum speed and zero torque.

T v x i 2 x pi x n rpm 60 n rpm is the speed of the motor. Per hp at 575 volts a 3 phase motor draws 1 amp per hp at 460 volts a 3 phase motor draws 1 25 amp per hp at 230 volts a 3 phase motor draws 2 5 amp per hp at 230 volts a single phase motor draws 5 amp per hp. For a 50 hz system the formula would be. Here omega ω is equal to 2 x pi x n rpm 60.

Calculating the rpm resulting from a motor and speed reducer assembly requires only basic mathematical knowledge. T ftlb torque lb f ft. At 1800 rpm a motor develops a 3 lb ft. 1 ft lb f 1 356 nm.

Pulley and speed calculator. Motor torque changes with the speed. Torque in imperial units can be calculated as. Since the number of poles of athree phaseinduction motoris established when it is manufactured the only way to change the speed of the motor is to change thefrequency.