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1. 发明授权

US06222751B1 Driver circuit for a polyphase DC motor with minimized voltage spikes 有权
标题翻译：具有最小电压尖峰的多相直流电机的驱动电路
公开(公告)号：US06222751B1
公开(公告)日：2001-04-24
申请号：US09571354
申请日：2000-05-15
申请人： Salvatore Portaluri , Alessandro Savo , Maurizio Nessi , Luigi Eugenio Garbelli , Giorgio Sciacca
发明人： Salvatore Portaluri , Alessandro Savo , Maurizio Nessi , Luigi Eugenio Garbelli , Giorgio Sciacca
IPC分类号： H02M75387
CPC分类号： H03K17/166 , H02M7/53803
摘要： A driver circuit includes a half-bridge output stage including two transistors with a common terminal for connection as the driver output to a coil of a DC motor. Two amplifiers drive the transistors in the push-pull operation and two capacitors are connected between the driver output and one input of a respective amplifier to form feedback loops for controlling the output slew-rate. Two current generators are selectively connected to an input of either of the amplifiers through respective pairs of switches. A commutation sequencer turns on and off the switches according to a commutation program. Comparators are connected to the drive output for detecting predetermined output voltage conditions and providing the commutation sequencer with signals for conditioning the commutation program as a function of the detected voltage conditions.
摘要翻译：驱动器电路包括半桥输出级，其包括具有用于连接的公共端子的两个晶体管，因为驱动器输出到直流电动机的线圈。两个放大器在推挽操作中驱动晶体管，并且两个电容器连接在驱动器输出和相应放大器的一个输入端之间，以形成用于控制输出转换速率的反馈回路。两个电流发生器通过相应的开关对选择性地连接到任一放大器的输入。换向顺序器根据换向程序打开和关闭开关。比较器连接到驱动输出端，用于检测预定的输出电压状况，并根据检测到的电压条件向换向定序器提供用于调节换向程序的信号。

2. 发明授权

US06417639B1 Control circuit for a hard disk drive head 有权
标题翻译：硬盘驱动器头的控制电路
公开(公告)号：US06417639B1
公开(公告)日：2002-07-09
申请号：US09564307
申请日：2000-05-03
申请人： Luca Schillaci , Maurizio Nessi , Giorgio Sciacca
发明人： Luca Schillaci , Maurizio Nessi , Giorgio Sciacca
IPC分类号： G05B1101
CPC分类号： G11B5/59605 , G11B5/5526
摘要： A positioning system for a read/write head of a disk drive includes a rotatable data disk, a read/write head movable over the disk, a voice coil motor (VCM) connected to the head and a source of digital position signals. A control circuit includes means for generating a VCM control current, a sensor for sensing the VCM current and an amplifier having an inverting input connected to a reference voltage source through a resistor and to a sensor output, a non-inverting input connected to the source of digital position signals through a DAC and an output connected to an input of the drive means.
摘要翻译：用于磁盘驱动器的读/写头的定位系统包括可旋转数据盘，可移动到盘上的读/写头，连接到头的音圈电机（VCM）和数字位置信号源。控制电路包括用于产生VCM控制电流的装置，用于感测VCM电流的传感器和具有通过电阻器连接到参考电压源的反相输入和传感器输出的放大器，连接到源的非反相输入的数字位置信号通过DAC和连接到驱动装置的输入的输出。

3. 发明授权

US06249099B1 Silent phase commutation in a three-phase brushless DC motor 有权
标题翻译：三相无刷直流电机静音相位换向
公开(公告)号：US06249099B1
公开(公告)日：2001-06-19
申请号：US09345694
申请日：1999-06-30
申请人： Maurizio Nessi , Ezio Galbiati , Pierandrea Savo , Giorgio Sciacca , Luca Schillaci
发明人： Maurizio Nessi , Ezio Galbiati , Pierandrea Savo , Giorgio Sciacca , Luca Schillaci
IPC分类号： H02P750
CPC分类号： H02P6/10
摘要： A method drives a three-phase motor having first, second, and third coils. The method electrically connects the first coil to a first voltage reference and the second coil to a second voltage reference while leaving the other coil floating during a first driving phase. During a second driving phase, the first coil is electrically connected to the first voltage reference and the third coil is electrically connected to the second voltage reference while the second coil is left floating. During a transition phase that immediately follows the fast driving phase and immediately precedes the second driving phase, the second coil is electrically connected alternately to the first and second voltage references. By alternately connecting the second coil to the first second voltage references and during the transition phase, the method causes the current through the second coil to reduce to zero at a slower rate than prior methods. This enables the variations of the currents that the two phases in commutation, the second and third coils, to happen in a way that maintains their sum constant, as much as possible. This reduces the torque ripple during the phase commutations and its accompanying acoustic noise.
摘要翻译：一种驱动具有第一，第二和第三线圈的三相电动机的方法。该方法在第一驱动阶段期间将第一线圈电连接到第一参考电压并将第二线圈电连接到第二参考电压，同时使另一线圈浮置。在第二驱动阶段期间，第一线圈电连接到第一参考电压，而第三线圈电连接到第二参考电压，而第二线圈悬空。在紧接着快速驱动相位并且紧接在第二驱动相位之前的转变阶段期间，第二线圈交替地电连接到第一和第二参考电压。通过交替地将第二线圈连接到第一第二电压基准，并且在转变阶段期间，该方法使得通过第二线圈的电流以比现有方法更慢的速率减小到零。这使得能够以尽可能多的方式使换相，第二和第三线圈中的两相的电流的变化以保持它们的和恒定的方式发生。这降低了相位转换期间的转矩脉动及其伴随的声学噪声。

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