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24-05-2021 Electric Motors

Q. How many types of load on electric motors?


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Dapzoi Verified
Commented on 2021-05-24 16:00:33 (IST)
The three main electric motor load types are:

Variable-torque loads : eg fans and pumps where the speed varies. With this type of load, reducing the speed of the motor by even a small amount can save a lot of energy.
Constant-torque loads : eg conveyors, screw and reciprocating compressors, and crushers. With these loads, the amount of power consumed is in direct proportion to the useful work done. So halving the speed will halve the energy consumed.
Constant-power loads : eg machine tools and centre winders. With these loads, the power is constant so there will rarely be energy savings when the speed is reduced.