Electric Motor Torque Equation

At no load you have maximum speed and zero torque.

Electric motor torque equation. Load adds mechanical resistance. Electrical motor power velocity and torque equations. 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. 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 equation of an induction motor the developed torque or induced torque equation in a machine is defined as the torque generated by the electric to mechanical power conversion. T ftlb torque lb f ft. Torque is nothing but a momentary force developed at the time of force is applied to the motor. Torque equation of dc motor gives the amount and nature of electrical torque t e developed whenever it is taken into service.

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. The flux φ produced by the stator is proportional to stator emf e 1. These equations are for estimation only friction windage and other factors are not taken into consideration. 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.

One is emf equation and another is torque equation. The following calculators compute the various torque aspects of motors. Therefore understanding of torque equation is a must for performance analysis. The torque of a 60 hp motor rotating at 1725 rpm can be calculated as.

T inlb p hp 63025 n 1. Motor torque changes with the speed. Torque in imperial units can be calculated as. T fl 5252 60 hp 1725 rpm 182 7 lb ft.

In other words torque t n m is equal to the ratio between the electrical power p w in watts to the acceleration. T inlb torque in lb f. The unit of torque is n m newton meter. 1 ft lb f 1 356 nm.

P hp horsepower delivered by the electric motor hp. Nema national electrical manufacturers association have classified electrical motors in four different designs where torques and starting load inertia are important. How to calculate torque of motor. Basically the performance of dc machine centers around two equations.

The torque is also known as electromagnetic torque. 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. T ftlb p hp 5252 n 1b. Example electrical motor and braking torque.