Which of the following load have constant load torque and variable speed?

Explanation: Speed hoist is a perfect example of constant type loads in which torque variation is independent of speed. The speed-torque characteristics of this type of load are given by T=K where K is a constant. 4. Torque inversely varies with the speed in the windage load torque component.

When the load torque is increased energy saving?

Energy saving is decreased when the load torque is increased. Energy saving has been obtained until a load torque of about 42\% of the rated torque; for higher torques no energy conservation is achieved.

Are fans constant torque?

Many variable torque loads decrease with the square of the speed. This is characteristic of centrifugal pumps, and certain types of fans and blowers. Constant torque loads cause motors to draw relatively high current at low speeds when compared to variable torque applications.

Is a fan constant torque or variable torque?

Type 3 – VARIABLE TORQUE LOADS Variable torque loads include most centrifugal and axial pumps, fans and blowers and many mixers and agitators.

What is the difference between constant torque and variable speed?

With constant torque loads, the torque loading is not a function of speed. As the speed changes, the load torque remains constant and the horsepower changes linearly with speed. Constant torque loads cause motors to draw relatively high current at low speeds when compared to variable torque applications.

How a constant torque drive produces constant torque through its full speed range?

The torque remains constant up to the base/full speed. In order to keep a constant torque, which is directly related to current, the voltage going from the VFD to the motor is increased as the speed increases. On a 460 Volt motor, 460 Volts is only applied to the motor when the speed reaches 60 Hz.

Why does torque reduced at high speed?

At high RPM, torque drops off primarily from intake and exhaust flow restriction. Volumetric Efficiency declines because the engine can’t breathe any faster. Mechanical efficiency also declines at higher RPM, due to increased frictional resistance. This further reduces torque at the output.

What is the difference between motor torque and load torque?

Mechanical or load torque is proportional to the product of force and distance. When a motor is decelerating, the motor torque is less than the load torque. Conversely, when a motor is accelerating, the motor torque is higher than the load torque.