Electric Motor Torque Equation

Therefore understanding of torque equation is a must for performance analysis.

Electric motor torque equation. Basically the performance of dc machine centers around two equations. T ftlb torque lb f ft. Load adds mechanical resistance. Torque equation of dc motor gives the amount and nature of electrical torque t e developed whenever it is taken into service.

The torque is also known as electromagnetic torque. 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 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.

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. T inlb torque in lb f. 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. The flux φ produced by the stator is proportional to stator emf e 1.

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. One is emf equation and another is torque equation. Torque in imperial units can be calculated as. 1 ft lb f 1 356 nm.

Motor torque changes with the speed. These equations are for estimation only friction windage and other factors are not taken into consideration. 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. Torque is nothing but a momentary force developed at the time of force is applied to the motor.

In other words torque t n m is equal to the ratio between the electrical power p w in watts to the acceleration. T ftlb p hp 5252 n 1b. At no load you have maximum speed and zero torque. Example electrical motor and braking torque.

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. T fl 5252 60 hp 1725 rpm 182 7 lb ft. T inlb p hp 63025 n 1. The unit of torque is n m newton meter.

N revolution per minute rpm alternatively. 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. P hp horsepower delivered by the electric motor hp. The torque of a 60 hp motor rotating at 1725 rpm can be calculated as.