STEUERSYSTEM ZUR STEUERUNG DER GESCHWINDIGKEIT EINES PERSONENBEFÖRDERERS

A control system for controlling the speed of a passenger conveyor. The passenger conveyor includes a passenger carrying means and an electric motor (5) for driving the passenger carrying means. The electric motor (5) has a rotor and is controlled by the control system. The control system includes a frequency inverter (4) receiving at least one inverter control signal and supplying motor voltages to the electric motor (5). The control system has a rotor sensor (ha, hb, hc) detectingpredetermined rotor angle positions and supplying rotor angle position signals (TR,k) related to predetermined rotor angle positions. The control system comprises a rotor position observer (7) which receives the rotor angle position signals (TR,k) and generates estimated rotor angle values (T^) on the basis of the received rotor angle position signals (TR,k). The estimated rotor angle values (T^) occur with a rate which is higher than the rate of occurrence of the received rotor angle position signals (TR,k). The rotor position observer (7) generates an estimated rotor speed value (?^) in response to the estimated rotor angle values (T^). The control system includes a speed profile generator (1) which supplies areference angular speed value (?^) and a reference angular acceleration value (?.*). The control system has an adaptive speed controller (2) which receives the reference angular speed value (?^) and the reference angular acceleration value (?.*) as set values and the estimated rotor speed value (?^) and the estimated rotor angle values (T^) as actual values. The adaptive speed controller (2) supplies reference motor current values ( i*