Rotary Torque and Power

WHAT THIS SCREEN ANSWERS

Torque and power answer different questions. Torque describes the turning effort required at a shaft. Power describes how quickly that effort must be delivered. Confusing the two creates a common sizing error: a drive can have enough torque at low speed and still lack the power needed at operating speed. This screen keeps the quantities separate before they are compared with a motor or gearbox envelope.

Enter the torque at the shaft being evaluated and the operating speed at that same shaft. MechPlane converts rpm to angular speed and multiplies the two values to show mechanical power. The efficiency field then shows the upstream demand after the transmission losses you choose to include. It is deliberately an input because efficiency changes with load, speed, lubrication, temperature, and the actual component.

The peak multiplier is a planning device, not a hidden service factor. It lets a user expose a likely transient requirement alongside the steady condition. Acceleration torque, start-up breakaway, indexing, and reversing loads should be calculated separately when they are material. A steady rotary load and a repeatedly accelerated rotor can have very different drive requirements even when their average power looks similar.

Use this page to define the initial power and torque envelope, then continue to the duty and inertia screens. Confirm a real motor from its torque-speed curve, thermal limits, controller capability, gearbox limits, mounting load, and environmental rating. Do not treat the result as a released motor selection or a statement of machine safety.