公开(公告)号：JP2002218788A

公开(公告)日：2002-08-02

申请号：JP2001400308

申请日：2001-12-28

Applicant: ST MICROELECTRONICS INC

Inventor： ENDER T EROGURO ,  MENEGOLI PAOLO ,  LI WHITNEY H

IPC: H02P6/18 ,  G11B19/28

Abstract: PROBLEM TO BE SOLVED: To provide a method and a system which start rotation of a spindle motor for a disc drive from a stationary state into an operation-enable state which is suitable for memory access operation. SOLUTION: A multiphase motor is energized with a first prescribed commutation phase. Whether zero-crossing of a counter electromotive force (bemf), corresponding to the first prescribed commutation phase, is produced. Whether the multiphase motor is advanced to a commutation phase relatively consecutive to the first prescribed commutation phase. According to the detection of the zero-cross of the bemf signal, the affirmative determination of that the multiphase motor is advanced to the commutation phase relatively consecutive to the first prescribed commutation phase, and acceleration procedure for accelerating the speed of the multiphase motor toward a required speed is executed.

公开(公告)号：JP2002136173A

公开(公告)日：2002-05-10

申请号：JP2001243706

申请日：2001-08-10

Applicant: ST MICROELECTRONICS INC

Inventor： MENEGOLI PAOLO ,  ENDER T EROGURO ,  LI WHITNEY H

IPC: G11B19/28 ,  G06F13/00 ,  H02P6/16 ,  H02P6/20

Abstract: PROBLEM TO BE SOLVED: To provide a technology which decides whether a motor, such as a disc drive system multiphase motor, etc., is rotating. SOLUTION: First, electrical characteristics of one phase of a motor is detected. The electrical characteristics are sensed a plurality of turns and the measurement based upon the times corresponding to them is carried out, to decide whether the rotor of the motor is rotating. If it is decided that the rotor is not turning, the rotor is rotated at an operation enabled speed, whereas if it is decided that the rotor is turning, a resynchronization operation is carried out, to synchronize the application of a drive signal with respect to the phase winding of the motor with the dynamic position of the rotor.