公开(公告)号：JP2002136170A

公开(公告)日：2002-05-10

申请号：JP2001262752

申请日：2001-08-31

Applicant: ST MICROELECTRONICS INC

Inventor： MENEGOLI PAOLO ,  ENDEL TSUNKU EROGURU ,  WITNEY FUI RI

IPC: H02P6/10 ,  H02P6/08

Abstract: PROBLEM TO BE SOLVED: To provide improved method and system for the control of a multi- phase motor with a plurality of windings. SOLUTION: This system has a memory device in which data expressing a prescribed drive profile are stored and a driver circuit, which drives windings of a multiphase motor according to the data supplied by the memory device. A feedback control loop, which has input terminals connected to the selected windings of the multiphase motor and supplies an address signal to the memory device according to the current level of the winding selected at an approximate timing, when a corresponding counter electromotive force (bemf) cross zero reference. The feedback control loop controls the current supplied to the selected winding by the driver circuit, so as to make the phases of the currents supplied to the respective windings substantially equal to the phase of the counter electromotive force signal, corresponding to the selected winding.

公开(公告)号：JP2002095277A

公开(公告)日：2002-03-29

申请号：JP2001224590

申请日：2001-07-25

Applicant: ST MICROELECTRONICS INC

Inventor： MENEGOLI PAOLO ,  ENDEL TSUNKU EROGURU ,  WITNEY FUI RI

IPC: G05D3/12 ,  G11B19/28 ,  H02P29/00 ,  H02P5/00

Abstract: PROBLEM TO BE SOLVED: To provide a disk drive capable of dynamically correcting and shortening a processing time. SOLUTION: The disk drive comprises a motor and a speed control loop. The speed control loop has a frequency sensor and a filter. The filter has a filter section and an accumulator. The filter is programmable in such function as dynamically receiving a filter coefficient by the filter section.