Method and system for powering and measuring position of a DC-motor over a three-wire interface

摘要

A system comprising a motor controller (10) for providing a plurality (N) of first power signals (Us) and a single common second power signal (Ts) to a motor module (2) comprising a plurality of potentiometers (3) connectable to a plurality of DC-motors (1). The power signals (Us, Ts) and feedback signals (Ps) are sent over a wire interface (13) having less than three wires per motor. A position feedback signal (Ps) is read when a motor (1) is being powered. The power signals (Us, Ts) may be DC-signals, pulsed or tri-state signals. The circuit may have a voltage divider (11) consisting of two or three resistors. The actual motor position can be derived from the position feedback signals using one of two formulas or curves. A motor controller (10), and a method for driving a plurality of DC-motors is also disclosed.