Kollmorgen has introduced the new SFD-M (Smart Feedback Device, Multi-Turn). It allows machine builders to achieve high-resolution multi-turn feedback with absolute positioning information available at system startup.
Designed to work with AKDTM and AKD2G drives, the SFD-M absolute multi-turn encoder can be integrated into Kollmorgen housed servo motors at no additional charge compared to the SFD-3 single-turn absolute encoder, providing multi-turn performance, four times greater positioning accuracy and fifty times lower EMF noise.
Comparable third-party encoders come with a premium price. With the SFD-M, customers can achieve substantial savings in machine designs that perform at the highest levels of precision, efficiency and effectiveness.
The SFD-M measures the position of the rotor shaft throughout each 360º rotation without requiring reference to a home position, and it registers the total number of rotations the shaft has made in either direction.
This absolute multi-turn positioning capability is ideal when precise tracking of position is required over large rotational distances, such as in machine tool positioning, packaging machines, material handling, satellite tracking and many other applications.
Additionally, the SFD-M maintains absolute positioning information in real time even when the system is powered down, eliminating the need for time-consuming homing sequences upon startup.
Absolute multi-turn encoders from other providers often require a battery to retain positioning information when the system is powered down or during a power failure. These external batteries require replacement and can be subject to failure. Other alternatives use mechanical gear trains, which are noisy, backlash-prone and add size to the motor.
The new Kollmorgen SFD-M eliminates these issues, instead using energy-harvesting technology to reliably maintain positioning information with no need for batteries or gear trains. Battery-free operation eliminates maintenance issues while also supporting efforts to reduce the consumption of natural resources and minimize waste.
The SFD-M is highly accurate, offering these key specifications:
Resolution
- 24 bits per revolution
- 16,777,216 counts per revolution
- 0772 arc-sec per count
Multi-turn absolute range
- 16 bits = 65,536 motor revolutions
Accuracy
- < +/– 1 arc-min typical at 25 ºC
- < +/– 3 arc-min worst case
Click here to learn more about SFD-M.
Filed Under: Motion Control Tips
