FAIL-SAFE METHOD, DEVICE, AND SYSTEM OF A POSITION DETECTION SENSOR FOR MOTORS, CAPABLE OF NOTIFYING THE ERROR OF A MOTOR AND COMPENSATING THE POSITION DETECTION SIGNAL OF A POSITION DETECTION SENSOR WHEN A PLURALITY OF POSITION DETECTION SENSORS DETECT THE ERROR

摘要

PURPOSE: A fail-safe method, device, and system of a position detection sensor for motors are provided to control a motor to be normally operated. CONSTITUTION: A fail-safe unit (40) comprises a sensor error detector (100), a position signal compensating unit (110), and a fail-safe controller (120). The sensor error detector separately receives position detection signals from a plurality of hall sensors which detects the phase of a motor rotor and determines the error of a hall sensor based on the position detection signals. The position signal compensating unit produces a position detection signal which is presumed to be outputted when a hall sensor is in a normal state based on the position detection signal of the hall sensor when the position signal compensating unit determines errors in one or more hall sensors. The fail-safe controller produces a control command to output a warning tone or a message when the errors of one or more hall sensors are determined. The fail-safe controller controls to transmit the position detection signal from the position signal compensating unit to the current controller of a motor. [Reference numerals] (10) Current control unit; (100) Sensor error detector; (110) Position signal compensating unit; (120) Fail-safe controller; (20) Inverter unit; (30) Hall sensor; (M) Motor