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    • 3. 发明授权
    • DC Servomotor system
    • 直流伺服电机系统
    • US4346334A
    • 1982-08-24
    • US284803
    • 1981-07-20
    • Toyokazu Inoue
    • Toyokazu Inoue
    • D05B69/12D05B69/18G05D3/12G05B1/06
    • G05D3/121D05B69/12D05B69/18
    • An automatic motion or position control DC servomotor system in which a load-driving axis driven by a DC motor to be controlled in one rotary mechanism is rotated synchronously with, or following the rotation of, a reference axis manually operated or driven by another DC motor. The system comprises a position signal generator producing first sine- and cosine-wave signals corresponding to an angle of rotation of the controlled load-driving axis; a command signal generator producing second sine- and cosine-wave signals corresponding to an angle of rotation of the reference axis; an arithmetic unit processing the first and second sine- and cosine-wave signals and providing a sine-wave feedback voltage output signal; and a driver circuit amplifying the feedback voltage signal and providing a thus amplified signal to the DC motor driving the load-driving axis. When the reference axis is driven by another DC motor, the command signal generator may be a second position signal generator. The command signal and position signal generators each consists of a combination which preferably comprises a sine-cosine potentiometer. The DC servomotor system is suitably applicable to a sewing machine in such manner that the rotating hook shaft is driven by a first DC motor and the arm shaft by a second DC motor, the first DC motor being controlled synchronously with the second one under closed-loop feedback control as stated above.
    • 一种自动运动或位置控制DC伺服电动机系统,其中由一个旋转机构中控制的DC电动机驱动的负载驱动轴与由另一DC电动机手动或驱动的参考轴同步旋转或跟随其旋转 。 该系统包括位置信号发生器,其产生对应于受控负载驱动轴线的旋转角度的第一正弦波和余弦波信号; 产生对应于参考轴的旋转角度的第二正弦和余弦波信号的命令信号发生器; 运算单元处理第一和第二正弦波和余弦波信号并提供正弦波反馈电压输出信号; 以及驱动电路,放大反馈电压信号,并将这样放大的信号提供给驱动负载驱动轴的直流电动机。 当参考轴由另一DC电动机驱动时,指令信号发生器可以是第二位置信号发生器。 命令信号和位置信号发生器各自由优选地包括正弦余弦电位计的组合构成。 直流伺服电机系统适用于缝纫机,使得旋转钩轴由第一直流电动机驱动,并且通过第二直流电动机驱动臂轴,第一直流电动机与第二直流电动机在闭环状态下同步地被控制, 环路反馈控制。