Force and Speed Requirements - Linear Actuator Design Considerations

Force and Speed requirements are two of the basic design considerations influencing selection of a linear motion system. After estimating the required thrust and choosing a Nema size that may fit your application, load speed and acceleration must be evaluated in order to choose an appropriate screw lead.

Due to the nature of lead screws, output speed and output thrust achievable by a motor / lead screw combination are two inversely proportional variables (i.e., increasing the required thrust will lower the achievable speed for a given motor / lead screw combination). Therefore, a given system’s maximum output force is lowered for applications that require higher speeds.

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