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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
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.
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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
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.
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Patent Agency Ranking3.发明专利
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
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.
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4.发明专利
公开(公告)号：JP2002125390A
公开(公告)日：2002-04-26
申请号：JP2001243809
申请日：2001-08-10
Applicant: ST MICROELECTRONICS INC
Inventor： MENEGOLI PAOLO
Abstract: PROBLEM TO BE SOLVED: To provide a method and a device for controlling the action of a multi-phase motor, especially for rotating a motor from inactive state to operable state. SOLUTION: The electrical properties of one or more pieces of phase winding are detected initially by executing, for example, induction detecting action. It is determined whether the rotor of a motor is rotating, using the detected values of the electrical properties. When it is determined that the rotor is not rotating, spin up action is executed to put the rotation of the rotor at operable rotational speed. On the other hand, when it is determined that the rotor is rotating, resynchronizing action is executed so as to synchronize the application of a drive signal for the phase winding of a motor with the dynamic position of the rotor.
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公开(公告)号：JP2001359295A
公开(公告)日：2001-12-26
申请号：JP2001124211
申请日：2001-04-23
Applicant: ST MICROELECTRONICS INC
Inventor： MENEGOLI PAOLO
Abstract: PROBLEM TO BE SOLVED: To provide a circuit and a method for determining whether a brushless multi-phase motor is rotating in the reverse direction to the rotating direction during the normal operation period. SOLUTION: This circuit receives a reverse electromotive force signal of a first phase line and determines polarity of the reverse electromotive force signal, after the detection that the reverse electromotive force signal in relation to a second phase line has crossed the zero reference level. Based on the determined polarity of the reverse electromotive force signal of the first phase line, this circuit selective activates an output signal, indicating that the motor is rotating in the reverse direction.
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公开(公告)号：JP2000163902A
公开(公告)日：2000-06-16
申请号：JP32505599
申请日：1999-11-16
Applicant: ST MICROELECTRONICS INC
Inventor： MENEGOLI PAOLO
Abstract: PROBLEM TO BE SOLVED: To use a boost circuit in a low-voltage disk drive system by providing an inductive device connected to receive a second supply voltage and a charge storage device connected to the inductive device, for generating a first supply voltage, generating a current at a prescribed frequency through the inductive device and generating a voltage, while traversing the charge storage device. SOLUTION: When a signal in a node D vibrates, a transistor M1 is turned on/off. When the transistor M1 is turned off, and the transistor M2 is turned on, the transistor p1 is turned on, and a transistor Q1 in an inductive boost circuit 84 is turned on, and the current flows through an inductance L1 of the inductive boost circuit 84 and the transistor Q1. When the transistor M1 is turned on, the transistors M2, p1, Q1 are turned off. The diode D2 of the inductive boost circuit 84 is forward biased, and a capacitor C2 is charged.
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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
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.
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