Planning
Choosing the right electromechanical drive requires careful planning—from safety and precision to optimal integration into your installation space. But what really matters? Our articles help you better understand key aspects such as self-locking, safety solutions, and bearing concepts—so you can perfect your application.
FAQs about Planning
Anti-rotation is always necessary. Due to the sliding friction in the thread, the applied load would simply rotate along with it, and there would be no relative motion (linear motion).
The higher the axial force on the thread, the higher the frictional force, as Fr = FN * µ.
Both terms describe the ability of a spindle not to "slip" on its own when at a standstill.
Static self-locking refers to a thread angle between 2.4°-4.5°. In standstill, the spindle does not slip on its own, but it might not come to a stop on its own from motion. Dynamic self-locking occurs when there is an additional braking action from the dynamics. The thread angle is then smaller than 2.4°.
Self-Locking: Static vs. Dynamic | GROB Antriebstechnik GmbH chevron_right- When under pressure load: depending on the control, 100% repeatability can be achieved.
- Under changing loads: the control system must consider the backlash at the sprocket and manufacturing tolerances in the chain links.
Self-locking is achieved with a pitch angle below 4.5 degrees.
- The load must always be guided
- Acceleration should be controlled via a ramp
- The chain cannot perform a swiveling movement
- The permissible buckling length must not be exceeded
Pillow block bearings are used in lift systems with mechanical coupling (i.e., connecting shafts). The bearings shorten the free length of the connecting shafts, thereby preventing oscillation at high speeds.
No, a fixed bearing is fundamental in any drive system. Without a fixed bearing, reliable axial movement cannot be performed.
Yes, for short spindles or low speeds, the spindle is sufficiently dimensionally stable without additional radial bearings at the spindle end.
When transporting people, DIN EN ISO 17206 applies. This standard for event technology defines the required safety measures, safety devices, and system-relevant shutdowns.
The duty cycle (ED) indicates how long an electromechanical drive can operate within a given time period without overheating. It is typically expressed as a percentage and refers to a 10-minute cycle.
The larger the screw diameter, the more complex an anti-rotation design using a keyway and key becomes. Rule of thumb: For screw diameters up to 40 mm, an anti-rotation system using a keyway and key is practical. For screw diameters of 55 mm and above, an anti-rotation solution using a square tube and square block is better.