Patent ID: 6249101
Filing Date: 2001-06-19
Classification: H02P

Abstract:
A start-up routine for a multiphase brushless DC motor having at least one rotor position sensor for providing an angular resolution less than an angular resolution of a synchronized driving system of the motor, the start-up routine comprising:setting at least one angular check zone having an arc length angularly correlated to a position of the at least one rotor position sensor;assessing or presuming an initial rest position of a rotor of the motor;exciting for fixed time intervals phase windings of the rotor in a sequence for rotating the rotor in a desired direction toward an angular position next to the initial rest position of the rotor while masking signals from the at least one rotor position sensor for a predefined masking time;repeating the exciting until verifying that excited phase windings are those commanding advancement of the rotor toward the at least one angular check zone, or verifying a change of state of the signal from the at least one rotor position sensor if the predefined masking time has elapsed; andassociating to each signal of the at least one rotor position sensor a new angular check zone to be reached by repeating the sequence of operations starting from the exciting.