Torque Calculation - 1 Motor Connected to 2 Gearboxes in Series

• It is the load that determines the torque at the gearbox.
• It is the gearbox that determines the speed and torque needed from the motor.
• It is the torque at the motor that determines the current drawn from the supply.
• It is the voltage at the supply together with the current draw that determines the input power of the motor.

Each of the three final shafts receives 10kw (less small losses) of power; thus use 10kw as the basis for calculating torque.

The forum doesn't know what the rolls are driving yet. If there is slippage or stretching then the statement may not be true.

Hello,

Universal shaft connected to roll which in turn move the pipe in a conveyor.

Above all are part of pipe straightening machine.

Regards,

RR

In this case, the torque may not always be distributed equally. To be on the safe side, it would thus be better to design each shaft to accept the total power input; and also any initial surges as the pipe engages each roller.

Quite. GA

I don't know whether others can visualise that, but I can't. What is a universal shaft in this context? If you just mean it's a shaft (or 3) with Hooke joints, that detail is irrelevant to the torque question.

Does the 2^nd gearbox have 3 output shafts, all running at same speed? Are the loads on the 3 shafts controlled in any way? If not, in principle you could have all 30kW going to one shaft, and it wouldn't be a problem as long as the gearboxes can take the torque. Not sure what you're asking.

Codey

The amount of power consumed by each shaft depends on the load on each shaft but the sum of power consumed by each shaft added with losses in both gearboxes cannot exceed 30 KW

The load is what really matters. If you can't accurately estimate that, then 30kW is your answer as safety > $$$.

If, for any reason, the shafts do experience a torque requirement of 30kW each, then the g-box will be O/loaded!

For that reason, The OP must make sure that the total is < 30kW during the worst case. For each shaft, the load will depend on the process and design of the machine.

Then, designing each shaft connection to take 30 kW is an overkill.

It's time ralish came back and commented on advice given, and clarifies what he's doing.

Codey