How to Run a Linear Motor With TMC4671

In this application note, learn how the TMC4671 enables precise closed-loop torque, velocity, and position control for linear motors using Field Oriented Control (FOC). It details configuration steps for incremental ABN encoder feedback, including pole pair setup, encoder resolution calculation, initialization, and linear scaling to achieve micrometer-level positioning. The note also demonstrates system setup and tuning using TMCL-IDE, providing a practical path from hardware configuration to optimized linear motion performance.

Application Note Overview

Used in precision stages, semiconductor equipment, and other high-performance motion systems, linear motors require accurate closed-loop control to achieve smooth force generation and micrometer-level positioning. This application note explains how the TMC4671 enables Field Oriented Control (FOC) for linear motors, supporting hardware-based torque, velocity, and position control while decoupling real-time motor control from the host application.

Download this application note from TRINAMIC Motion Control (now a part of Analog Devices) to learn how to configure a linear motor with incremental ABN encoder feedback, including motor type selection, pole pair configuration, encoder resolution setup, and electrical angle alignment. The note details how to calculate encoder pulses per electrical period, perform encoder initialization (Mode 0) to establish a known commutation reference, and apply a linear scaling factor to translate internal units into real-world micrometers.

The note also walks through practical implementation using the TMCL-IDE wizard and evaluation hardware, covering ADC configuration, feedback selection, PI tuning, and position-mode testing. A worked example demonstrates how a 3 cm pole pair length combined with 1 µm encoder resolution enables precise linear positioning, providing a structured path from hardware setup to optimized closed-loop performance.