DRIVE METHOD AND DRIVE CONTROLLER FOR BRUSHLESS AND SENSORLESS DC MOTOR

摘要

PPROBLEM TO BE SOLVED: To provide a drive method and a drive controller which are so arranged as to smoothly and favorably perform the process from the start to the sensorless drive of a rotor by simply estimating the rotor magnetic pole position of a brushless and sensorless DC motor. PSOLUTION: In this drive method, the voltage for detection of the magnetic pole position of a rotor on a level that the rotor 2a, where permanent magnets are arranged around, does not rotate is applied to the armature winding of each energization phase of the brushless and sensorless DC motor 2 in order for a specified time, according to a specified energization pattern, and the magnitude of the armature current flowing to the armature winding of each energization phase is detected for each energization phase, based on the magnetic flux flowing between the magnetic pole of the stator iron core where armature winding of each energization phase is wound and the rotor 2a by the application of the voltage for detection of the magnetic pole position of the rotor, and the energization phase of the armature winding where the maximum current flows is selected, and the selected energization phase is estimated as the magnetic pole position of the rotor, and necessary starting voltage is applied to the armature winding of the next phase of the energization phase estimated as the rotor magnetic pole position so as to drive the rotor 2a. PCOPYRIGHT: (C)2006,JPO&NCIPI