Position control on a budget
POSITAL's new magnetic encoders provide absolute position feedback. With absolute measurement systems, complete position measurements are available whenever the control system queries the encoders. Production processes can be restarted directly with minimal loss of time and materials. POSITAL's absolute kit encoders are available with multi-turn measurement ranges, which can be very useful when a motor is connected to a screw shaft, cable drum, or gear reduction system. The multi-turn rotation counter is self-powered, using POSITAL's Wiegand energy harvesting technology. The rotation count is always up-to-date, even if the machine has moved while control system power was out. No backup batteries are required. POSITAL's encoders for stepper motors are "kit" or modular devices, designed to be integrated into a motor housing, measuring the rotary position directly from the drive shaft. Kit packages are available with the same mounting form factor as popular incremental encoders for NEMA-standard stepper motors, making these encoders convenient drop-in replacements for less advanced incremental encoders. The magnetic measurement module is compact (37mm diameter, 23mm deep) and highly resistant to dust, moisture, and shock/vibration loading. Shields are available to protect the measurement module from external magnetic fields. SSI and the more advanced "BiSS C" communication interfaces have been implemented. Both are open-source interfaces that are compatible with a wide range of PLC's and computers.
The FRABA Group | www.fraba.com
Volume: 2019 September/October