Electric Motor Torque Equation

The torque of a 60 hp motor rotating at 1725 rpm can be calculated as.

Electric motor torque equation.

Nema national electrical manufacturers association have classified electrical motors in four different designs where torques and starting load inertia are important. T inlb p hp 63025 n 1. Generally horsepower is a unit for measuring the power of various electrical motors piston engines steam turbines etc and it is equal to 746 watts or. T ftlb torque lb f ft.

Example electrical motor and braking torque. The following calculators compute the various torque aspects of motors. How to calculate torque of motor. The dc motor as we all know is a rotational machine and torque of dc motor is a very important parameter in this concern and it s of utmost importance to understand the torque equation of dc motor for establishing its running characteristics.

Torque is nothing but a momentary force developed at the time of force is applied to the motor. Horsepower to torque converter is an online tool used in electrical engineering to calculate how much torque will be generated according to the input power value either in horsepower or watts. Basically the performance of dc machine centers around two equations. T fl 5252 60 hp 1725 rpm 182 7 lb ft.

1 ft lb f 1 356 nm. Therefore understanding of torque equation is a must for performance analysis. One is emf equation and another is torque equation. In other words torque t n m is equal to the ratio between the electrical power p w in watts to the acceleration.

Where t is the torque produced by the induction motor φ is flux responsible for producing induced emf i 2 is rotor current cosθ 2 is the power factor of rotor circuit. P hp horsepower delivered by the electric motor hp. T ftlb p hp 5252 n 1b. N revolution per minute rpm alternatively.

The torque is also known as electromagnetic torque. T inlb torque in lb f. This developed torque in the motor differs from the actual torque available at the terminals of the motor which is almost equal to the friction and windage. At no load you have maximum speed and zero torque.

Motor torque changes with the speed. The unit of torque is n m newton meter. Electrical motor power velocity and torque equations. These equations are for estimation only friction windage and other factors are not taken into consideration.

The flux φ produced by the stator is proportional to stator emf e 1. 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. Load adds mechanical resistance. Torque in imperial units can be calculated as.