Motor Torque Calculation

2017/6/27 0:07:07 replies views Category: Motors

Selecting the proper motor and driver to meet a specific application needs motor torque calculation. Generally speaking, the user can follow the below steps to choose the proper motor and driver.

  1. Determine the motion profile and calculate acceleration, deceleration and maximum velocity required to make the desired move.
  2. Select mechanical drive mechanism to be used and calculated inertia, friction and load torque using formulas provided in this document.
  3. Determine required motor torque for the specific application.
  4. Select proper motor and driver based on their speed-torque characteristics.

Lead Screw Drive Loads

Lead screw drives are widely used in many applications, such as XY tables, slides, tool bit positioning, pick-and-place machines, engraving machines, microscope drives, and etc.




Wire Belt Drive Loads

Wire belt drives are usually adopted by relatively long distance drives, such as conveyors, jet-ink machines, plotters, assembly lines, and etc.

Direct Drive Loads

There are many direct drive applications, such as index tables, feeding materials, and etc. A motor is typically connected to the load through a flexible or compliant coupling. This coupling provides a small amount of damping and helps correct for any mechanical misalignment. Direct drive is attractive when mechanical simplicity is desirable and the load being driven is of moderate inertia.

Gear Drive Loads

Traditional gear drives are more commonly used with stepping motors. The fine resolution of a microstepping motor can make gearing unnecessary in many applications, where gears are used only for increase system precision. Gears generally have undesirable efficiency, wear characteristics, backlash, and can be noisy. Gears are useful; however, when very large inertias must be moved because the inertia of the load reflected back to the motor through the gearing is divided by the square of the gear ratio. In this manner, large inertial loads can be moved while maintaining a good load-inertia to rotor-inertia ratio (less than 10:1).


Checking the Required Motor Torque

Select a motor and check that the required motor torque falls within the pull-out torque of the speed-torque characteristics.



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