How can I calculate motor power for an overhead crane?

To calculate an Overhead crane motor power you have to know the following:

Hoisting(lifting) speed.

Height of lift.

Then you can calculate it by:

P = (M*g*v)/n

M = Mass

g = Gravity

v = velocity of raise mption

n (meant to be the greek letter nu) = efficiency losses due to gears/ pulleys

The standards applicable are BS466 (Electrical) and BS2573 (Pt 1 and 2 - Mechanical). All the info provided in earlier answers covers this. Dimensionally, this works out as P (Watts, or Joules/sec, or Force*velocity) in kg.m

Crane will have 3 Different motors:

Hoist Motor (Lifting)

Traverse Motor/s (Forward and Backward)

Cross travel Motor/s (Left and Right)

All these motors will have brake packs using power.

A EOT, or Electrically Operated Overhead crane, is more or less a standard piece of equipment in mechanical industries, factories, equipment, heavy vessel / equipment manufacturing units, ship yards.

In addition to the motors, one for horizontal travel, one for travel for its designated distance and one for its lift mechanism, it also needs a festoon cable, for power supply, and maintenance access.

In addition, you will have to consider gear boxes, for the drives and motion making units, for the lifting mechanism and enough torque for safety ! Most important is that the building, structure, outdoor assembly should be designed safely enough to accommodate the crane itself and continue to operate safely at its designed full load conditions.

To start you off in your discovery process - I am mentioning two links.

Overhead crane - Wikipedia

Power calculation for hoist motor

(Note that the second link is the calculation only for the hoist motor)

In case you approach a manufacturer, you will have to mention the maximum weight which you want to be lifted, type of installation (indoor / outdoor), whether the building is designed to accommodate the crane and related information.

Off hand, any hoist / “crane” which can lift and shift a weight under 1000 kgs / 1.00 MT, can be installed in a normal RCC garage - with a rail, a manual chain operated hoist - no motors (!). Do check out with a civil engineer before actually trying it !

Hope you find this information useful - have a better day.