Linear actuator
    3.
    发明授权
    Linear actuator 失效
    线性执行器

    公开(公告)号:US5245232A

    公开(公告)日:1993-09-14

    申请号:US844780

    申请日:1992-03-02

    摘要: A linear actuator for e.g. a disk drive has a fixed member and a movable member. One of those members carries at least one track of permanent magnets extending in the direction in which the movable member is to move, with adjacent permanent magnets having alternate magnetic polarity. The other member has first and second drive parts, each having at least one pair of opposing sets of teeth. The moveable member or each track passes between those teeth. Each pair of teeth is associated with a corresponding drive coil giving the teeth a magnetic polarity so that there is a magnetic alignment between a polarity of the teeth and the permanent magnets. The drive parts are arranged so that, for any given relative position of the first and second members, the magnetic alignment of the teeth of one drive part is out of phase with the magnetic alignment of the teeth of the other part. In order to ensure that the magnetic alignments are out of phase, there may be a physical displacement between the teeth of the two drive parts. This displacement may be (m.+-.1/2).multidot.T.sub.p, where m is an integer and T.sub.p is the teeth pitch. This gives a phase displacement of 180.degree.. Alternatively, the drive parts may be aligned, and two tracks of permanent magnets be provided with the magnets thereof having opposite polarity for a given track position, or the drive current to the drive coils may be controlled to be out of phase.

    Method and apparatus for detection of physical quantities, servomotor
system utilizing the method and apparatus and power steering apparatus
using the servomotor system
    7.
    发明授权
    Method and apparatus for detection of physical quantities, servomotor system utilizing the method and apparatus and power steering apparatus using the servomotor system 失效
    物理量检测方法和装置,利用该方法和装置的伺服电机系统以及使用伺服电机系统的动力转向装置

    公开(公告)号:US5218279A

    公开(公告)日:1993-06-08

    申请号:US637776

    申请日:1991-01-07

    CPC分类号: G01D5/145

    摘要: In an apparatus of detecting an environmental physical quantity such as magnetism and temperature by utilizing a sensitive element having an internal, electrical physical quantity which changes as the environmental physical quantity changes, an external operator element is provided which acts, when the environmental physical quantity acting on the sensitive element changes, a physical quantity corresponding to the change on the sensitive element, an electrical quantity supplied to generate in the external operator a physical quantity corresponding to the change is detected, and the environmental physical quantity is detected from the electrical quantity to provide a detection signal devoid of hysteresis and "depression".

    摘要翻译: 在通过利用具有随着环境物理量变化而变化的内部电气物理量的敏感元件来检测诸如磁性和温度的环境物理量的装置中,提供外部操作元件,当外部操作元件作用时 在敏感元件变化时,检测对应于敏感元件变化的物理量,在外部操作者中提供的用于产生对应于该变化的物理量的电量被检测,并且从电量检测到环境物理量 提供没有滞后和“抑制”的检测信号。

    Method and apparatus therefor in motor speed control
    9.
    发明授权
    Method and apparatus therefor in motor speed control 失效
    电机速度控制方法及其设备

    公开(公告)号:US4638225A

    公开(公告)日:1987-01-20

    申请号:US824923

    申请日:1986-01-31

    IPC分类号: H02P7/29 H02P23/00 H02P5/06

    摘要: A pulse width control apparatus and method for controlling motor speed wherein the number of pulses relating to more speed feedback data is counted so as to control the speed of the motor in accordance with a speed command data and a pulse width modulation signal based on the counted number of pulses. A free-running hardware timer and a soft-timer on a program controlled by an instruction execution time of a microcomputer are arranged so that ON-time data and OFF-time data of the pulse width modulation signal are selectively set in one and the other of the hardware and soft-timers in dependence on values of the ON and OFF times, respectively. The ON and OFF states of the pulse width modulation signal are changed when the contents of the hardware and soft-timers reach predetermined values so as to control the pulse width thereof.

    摘要翻译: 一种用于控制电动机速度的脉冲宽度控制装置和方法,其中对与更多速度反馈数据相关的脉冲数进行计数,以便根据速度指令数据和基于计数的脉宽调制信号来控制电动机的速度 脉冲数。 在由微计算机的指令执行时间控制的程序上的自由运行的硬件定时器和软件定时器被布置成使得脉冲宽度调制信号的接通时间数据和关断时间数据被选择性地设置在一个 的硬件和软定时器分别依赖于ON和OFF时间的值。 当硬件和软定时器的内容达到预定值以便控制其脉冲宽度时,改变脉宽调制信号的ON和OFF状态。

    Method and apparatus for detecting position and velocity of moving body
    10.
    发明授权
    Method and apparatus for detecting position and velocity of moving body 失效
    用于检测移动体的位置和速度的方法和装置

    公开(公告)号:US4628314A

    公开(公告)日:1986-12-09

    申请号:US668893

    申请日:1984-11-07

    摘要: A method for detecting the position and the velocity by using an encoder mounted directly on a moving body wherein original signals of the encoder are pulse-width modulated by using a sampling carrier wave and the position is detected by measuring the width of the pulses thus obtained. An apparatus for implementing the method comprises a carrier wave generation circuit, a pulse width modulation circuit which pulse-width modulates the original signals coming from the encoder by using the carrier wave, a pulse width timer which measures the width of the pulses thus modulated, and a microcomputer connected to the pulse width timer.

    摘要翻译: 通过使用直接安装在移动体上的编码器来检测位置和速度的方法,其中使用采样载波对编码器的原始信号进行脉冲宽度调制,并且通过测量由此获得的脉冲的宽度来检测位置 。 实现该方法的装置包括:载波产生电路,脉冲宽度调制来自使用载波的编码器的原始信号的脉冲宽度调制电路;测量被调制脉冲宽度的脉冲宽度计时器; 和连接到脉宽定时器的微型计算机。