Types of Load (Cont.)
Load torques that vary with time
- Load variation with time can be periodic and repetitive
in certain applications.
- One cycle of the load variation is called a duty cycle.
- The variation of load torque with time has a greater importance
in the selection of a suitable motor.
Classification of loads that vary with time:
(a) Continuous,
constant loads: Centrifugal pumps or fans operating
for a long time under the same conditions, paper making
machines etc.
(b) Continuous,
variable loads: Metal cutting lathes, hoisting winches,
conveyors etc.
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