New Feature: Position Controlled by External Force Sensor
Continuous technological developments in Surface Mount Devices (SMD) and high precision Pick & Place applications, introduce new challenges for the motion control industry. Such applications require a precise control of the applied force or torque. Unlike traditional “current limit” methods, which depend to motor parameters and are subjected to temperature and manufacturing tolerances, the combination of a motor feedback and an external force sensor, provide superior position – force control for high-end OEM applications. SERVOTRONIX’S CDHD2 servo drive supports Real-Time force control together with advanced position control algorithms.
High Force Control performance.
PI Force controller – Increased smoothness and High control against overshot.
Compatible with SERVOTRONIX’s proprietary HD controller and Linear controller.
Figure 1. Cascade Control System with Force Controller
Best suited for force sensing applications such as:
Screws tightening applications, where a precise torque on screw is required.
Test machines for 3C industry (Computers, Communication and Consumer)
Force Control Commands
The feature supports two input methods:
Analog Command: +-10 VDC connected to CDHD2 analog input.
Digital Command: Serial (USB or RS232) or EtherCAT.
The Force Control Algorithm
Receive force setpoint in units of grams.
Limit the force set point by means of slope.
Read force sensor actual value via analog input and convert analog input from volts to Grams.
Force error = force setpoint – force sensor feedback
PI control loop
Typical Z axis Operational Sequence
Operation starts in Position mode.
Move axis to start position (above the pressed object).
Switch to Force Control mode.
Perform “Press” operation until force setpoint is reached.
Continuous technological developments in Surface Mount Devices (SMD) and high precision Pick & Place applications, introduce new challenges for the motion control industry. Such applications require a precise control of the applied force or torque.
STXI Motion Ltd. 21C Yagia Kapayim St. Petach Tikva 4913020 Israel Tel: +972-74-7776899
STXI Motion Inc. 707 Augusta Drive North Aurora, IL 60542 USA Tel: +630-408-7033