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公开(公告)号：JP2006172704A
公开(公告)日：2006-06-29
申请号：JP2005360532
申请日：2005-12-14
Applicant: Internatl Business Mach Corp
, インターナショナル・ビジネス・マシーンズ・コーポレーションInternational Business Maschines Corporation Inventor： BUI NHAN , INCH RANDY , OGURA EIJI , TSURUTA KAZUHIRO
IPC: G11B15/467 , G11B5/584 , G11B15/46 , G11B15/68
CPC classification number: G11B5/584 , G11B15/688
Abstract: PROBLEM TO BE SOLVED: To provide a compensator for synchronous sampling time-based servo system. SOLUTION: This method operates a tape drive, which has a basic tape speed for moving a magnetic tape along with a tape head, and which generates a first tape head position signal from the tape head at a first sample frequency proportional to the basic tape speed. Further, the method comprises the steps of: processing the first tape head position signal synchronized with the first sample frequency and controlling the tape head position using a control system including a compensator having a maximum phase response in a first cross over frequency; giving an interrupt signal synchronized with the first sample frequency to a processing system; and the processing system giving an output value h (k) which generates the maximum phase response at the first cross over frequency responsive to the processing system receiving the interruption signal. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract translation: 要解决的问题：为同步采样时间伺服系统提供补偿器。 解决方案：该方法操作磁带驱动器，其具有用于与磁带头一起移动磁带的基本磁带速度，并且其以与第一采样频率成比例的磁带头从磁带头生成第一磁头位置信号 基本磁带速度。 此外，该方法包括以下步骤：使用包括在第一交叉频率具有最大相位响应的补偿器的控制系统来处理与第一采样频率同步的第一磁带头位置信号并控制磁头位置; 将与第一采样频率同步的中断信号提供给处理系统; 并且所述处理系统给出响应于所述处理系统接收到所述中断信号而在所述第一交叉频率处产生最大相位响应的输出值h（k）。 版权所有（C）2006，JPO＆NCIPI
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公开(公告)号：JP2001178171A
公开(公告)日：2001-06-29
申请号：JP2000325546
申请日：2000-10-25
Applicant: IBM
Inventor： KOSKI JOHN ALEXANDER , BUI NHAN
Abstract: PROBLEM TO BE SOLVED: To provide a current-mode pulse-width modulation(PWM) technique for a brusless motor. SOLUTION: This brushless motor is controlled by increasing or decreasing the speed of the motor according to the polarity and the value of a pulse-width modulation control signal. With a motor current sensor, an actual motor current is detected. By using a current comparator, a desired reference current signal is compared with an actual current signal, and an error signal is generated. By using a pulse-width modulator, the error signal is converted into a pulse- width modulation error signal. By using an armature position sensor, the position of the armature of the motor is detected. On the basis of the pulse-width modulation error signal, a power switch is controlled, and the motor is controlled by a desired motor current corresponding to the desired reference current signal. When the error signal has a positive value, a negative value or a value of 0, a commutator drives the motor to either a positive position or a negative position or in the same way, so that the speed of the motor is increased, decreased or maintained.
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公开(公告)号：AT375029T
公开(公告)日：2007-10-15
申请号：AT00309568
申请日：2000-10-30
Applicant: IBM
Inventor： KOSKI JOHN ALEXANDER , BUI NHAN
Abstract: A current mode pulse width modulation (PWM) technique for brushless motors. The present system and method controls a brushless motor by increasing or decreasing motor speed respectively according to the polarity and value of a pulse width modulation (PWM) control signal. The PWM signal varies according to an error signal generated in proportion to the difference between a desired motor current and an actual motor current. A motor current sensor is used to sense an actual motor current being applied to the motor. A current comparator is used to compare the current desired reference signal and the actual current signal and to generate an error signal. A pulse width modulator is used to convert the error signal to a pulse-width modulated error signal. Armature position sensors are used for sensing armature positions of the motor. A commutator circuit receives the pulse-width modulated error signal and the armature positions of the motor. Power switches are coupled to outputs of the commutator and also coupled to the motor. The commutator controls activation and deactivation of the respective power switches based on the corresponding pulse-width modulated error signal to control the motor at a desired motor current that corresponds to the desired reference current signal. The commutator controls the respective power switches to drive the motor in either a more positive, a more negative direction, or in the same manner to respectively increase, decrease, or maintain the motor speed when the error signal correspondingly has a generally positive, negative, or zero value.
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公开(公告)号：MY119099A
公开(公告)日：2005-03-31
申请号：MYPI20004755
申请日：2000-10-11
Applicant: IBM
Inventor： KOSKI JOHN ALEXANDER , BUI NHAN
Abstract: A CURRENT MODE PULSE WIDTH MODULATION (PWM) TECHNIQUE FOR BRUSHLESS MOTORS. THE PRESENT SYSTEM AND METHOD CONTROLS A BRUSHLESS MOTOR BY INCREASING OR DECREASING MOTOR SPEED RESPECTIVELY ACCORDING TO THE POLARITY AND VALUE OF A PULSE WIDTH MODULATION (PWM) CONTROL SIGNAL.THE PWM SIGNAL VARIES ACCORDING TO AN ERROR SIGNAL GENERATED IN PROPORTION TO THE DIFFERENCE BETWEEN A DESIRED MOTOR CURRENT AND AN ACTUAL MOTOR CURRENT.A MOTOR CURRENT SENSOR IS USED TO SENSE AN ACTUAL MOTOR CURRENT BEING APPLIED TO THE MOTOR.A CURRENT COMPARATOR IS USED TO COMPARE THE CURRENT DESIRED REFERENCE SIGNAL AND THE ACTUAL CURRENT SIGNAL AND TO GENERATE AN ERROR SIGNAL. A PULSE WIDTH MODULATOR IS USED TO CONVERT THE ERROR SIGNAL TO A PULSE-WIDTH MODULATED ERROR SIGNAL. ARMATURE POSITION SENSORS ARE USED FOR SENSING ARMATURE POSITIONS OF THE MOTOR. A COMMUTATOR CIRCUIT RECEIVES THE PULSE-WIDTH MODULATED ERROR SIGNAL AND THE ARMATURE POSITIONS OF THE MOTOR.POWER SWITCHES ARE COUPLED TO OUTPUTS OF THE COMMUTATOR AND ALSO COUPLED TO THE MOTOR.THE COMMUTATOR CONTROLS ACTIVATION AND DEACTIVATION OF THE RESPECTIVE POWER SWITCHES BASED ON THE CORRESPONDING PULSE-WIDTH MODULATED ERROR SIGNAL TO CONTROL THE MOTOR AT A DESIRED MOTOR CURRENT THAT CORRESPONDS TO THE DESIRED REFERENCE CURRENT SIGNAL.THE COMMUTATOR CONTROLS THE RESPECTIVE POWER SWITCHES TO DRIVE THE MOTOR IN EITHER A MORE POSITIVE,A MORE NEGATIVE DIRECTION, OR IN THE SAME MANNER TO RESPECTIVELY INCREASE,DECREASE,OR MAINTAIN THE MOTOR SPEED WHEN THE ERROR SIGNAL CORRESPONDINGLY HAS A GENERALLY POSITIVE,NEGATIVE, OR ZERO VALUE.FIGURE 1
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