Electric Motor Torque Equation

Example electrical motor and braking torque.

Electric motor torque equation.

Therefore understanding of torque equation is a must for performance analysis. The torque is also known as electromagnetic torque. 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. N revolution per minute rpm alternatively.

Nema national electrical manufacturers association have classified electrical motors in four different designs where torques and starting load inertia are important. 1 ft lb f 1 356 nm. I e φ e 1 we know that transformation ratio k is defined as the ratio of secondary voltage rotor voltage to that of primary voltage stator. Torque equation of dc motor gives the amount and nature of electrical torque t e developed whenever it is taken into service.

The following calculators compute the various torque aspects of motors. 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. The torque of a 60 hp motor rotating at 1725 rpm can be calculated as. T fl 5252 60 hp 1725 rpm 182 7 lb ft.

P hp horsepower delivered by the electric motor hp. One is emf equation and another is torque equation. Basically the performance of dc machine centers around two equations. Torque is nothing but a momentary force developed at the time of force is applied to the motor.

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. How to calculate torque of motor. In other words torque t n m is equal to the ratio between the electrical power p w in watts to the acceleration. 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 torque lb f ft. The flux φ produced by the stator is proportional to stator emf e 1. T inlb torque in lb f. 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. T ftlb p hp 5252 n 1b. 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. T inlb p hp 63025 n 1.

Torque in imperial units can be calculated as. 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. These equations are for estimation only friction windage and other factors are not taken into consideration. The unit of torque is n m newton meter.