Electric Motor Torque Ratings

If the torque requirements of the connected load increase beyond 1 horsepower and the motor is supplied either 208 volts 230 volts or 460 volts at 60 hz.

Electric motor torque ratings.

A motor does an amount of work equal to the torque it delivers times the angle through which it turns. Electrical motor power velocity and torque equations. An electric motor produces torque in response to load. Fla according to the voltage rating.

The actual speed of the turning rotor will slow down below the nameplate rated. An electric motor is an electrical machine that converts electrical energy into mechanical energy most electric motors operate through the interaction between the motor s magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor s shaft. Reduced voltage soft starters are used to limit the start current reducing the locked rotor torque or starting torque and are common in applications which is hard to start or must be handled with care like positive displacement pumps cranes elevators and similar. T inlb torque in lb f.

These equations are for estimation only friction windage and other factors are not taken into consideration. Horse power and speed in rpm. The following calculators compute the various torque aspects of motors. T ftlb torque lb f ft.

T ftlb p hp 5252 n 1b. N revolution per minute rpm alternatively. T inlb p hp 63025 n 1. 1 ft lb f 1 356 nm.

P hp horsepower delivered by the electric motor hp. P t v 5 250. Accelerating torque available motor torque load torque. You load it the rpm drops and it draws more current and produces more torque.

For an electric motor torque increases a gasoline motor has a peak torque value for a given rpm 3600. It s easy to peg that as a hp rating measured torque at a fixed rpm. Motor power then is the torque times the angular speed. Electric motors can be powered by direct current dc sources such as from batteries motor vehicles.

Electric motors start up with very high torque level off slightly under and maintain that level throughout if they are overloaded the torque drops quickly and the motor stalls. Gas engines are usually rated for horsepower and torque at a specific rpm go under or especially over and the torque drops off.