Patent ID: 6838840
Filing Date: 2005-01-04
Classification: H02P

Abstract:
1. A control system for controlling and protecting electric motors provided with a rotor, specially permanent magnet motors electronically actuated by a control system, the electric motor comprising poles, the control system comprising position detectors detecting the position of the rotor with respect to the poles of the motor, the method comprising the steps of: continuously reading the position detector until a minimum expected time has passed and turning off the control system if a position change of the rotor is detected by the position detector, the minimum expected time being started to be counted from the passage of the rotor at a pole of the motor, after the minimum expected time has passed, continuously reading the position detector until a maximum expected time has passed and turning off the control system if a position change of the rotor is not detected by the position detector with the maximum expected time, the maximum expected time being subsequently counted after the minimum expected time has passed, if a position change is detected within the maximum expected time, measuring the position of the rotor and actuating the next phase of the motor if the position reached by the rotor is a previously predicted contact position, or turning off the system if the position reached by the rotor is not the previously predicted correct position; measuring the position of the rotor to detect if one complete turn has been reached, and if a turn of the rotor has been completed, reading the rotation speed of the rotor and calculating a corrected value of the maximum and minimum expected time for the current speed and afterwards repeating the steps from the step of continuously reading the position detector until a minimum expected time has passed, or if a complete turn of the rotor has not been completed, repeat the steps from the step of continuously reading the position detector until a minimum expected time has passed.