Electric Motor Torque Equation

Torque equation of dc motor gives the amount and nature of electrical torque t e developed whenever it is taken into service.

Electric motor torque equation.

Therefore understanding of torque equation is a must for performance analysis. 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. Electrical motor power velocity and torque equations. Nema national electrical manufacturers association have classified electrical motors in four different designs where torques and starting load inertia are important.

The flux φ produced by the stator is proportional to stator emf e 1. 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. At no load you have maximum speed and zero torque. These equations are for estimation only friction windage and other factors are not taken into consideration.

How to calculate torque of motor. T inlb p hp 63025 n 1. Motor torque changes with the speed. 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.

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 is nothing but a momentary force developed at the time of force is applied to the motor. 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. 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.

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. One is emf equation and another is torque equation. T ftlb p hp 5252 n 1b. Load adds mechanical resistance.

N revolution per minute rpm alternatively. T ftlb torque lb f ft. T inlb torque in lb f. P hp horsepower delivered by the electric motor hp.

Example electrical motor and braking torque. Torque in imperial units can be calculated as. 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.

In other words torque t n m is equal to the ratio between the electrical power p w in watts to the acceleration. The torque is also known as electromagnetic torque. 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. 1 ft lb f 1 356 nm.