Synchronous motor control system and method of controlling synchronous
motor
    2.
    发明授权
    Synchronous motor control system and method of controlling synchronous motor 失效
    同步电机控制系统及同步电动机控制方法

    公开(公告)号:US6025691A

    公开(公告)日:2000-02-15

    申请号:US37632

    申请日:1998-03-10

    摘要: A synchronous motor control system which can freely regulate n-phase electric currents in a synchronous motor to control the characteristics of the synchronous motor. The synchronous motor control system can enhance the output torque per unit weight of a synchronous motor (40) simultaneously with reducing torque ripples. The waveform of three phase alternating currents is freely corrected over a range of +30 degrees from a specified electrical angle, at which a target phase current drawing a sine-wave curve reaches its peak value. It is assumed that this range of .+-.30 degrees corresponds to a range of 0 degree to 60 degrees. By way of example, the waveform is controlled to the peak value of the phase current in a range of 0 degree to 28 degrees. The correction of the phase current is carried out for the target phase which produces the primary magnetic flux of a revolving magnetic field. This improves a fall in torque due to the phase shift and reduces torque ripples while keeping the mean torque at a high level. The system of the invention can arbitrarily regulate the torque waveform of the synchronous motor (40), thereby freely controlling the torque characteristics of the synchronous motor (40).

    摘要翻译: 一种同步电机控制系统,可以自由调节同步电机中的n相电流,以控制同步电机的特性。 同步电动机控制系统可以同时减小转矩波动同时提高同步电动机(40)每单位重量的输出转矩。 三相交流电流的波形在从指定的电角度+ 30度的范围内自由校正,在该范围内,绘制正弦波曲线的目标相电流达到其峰值。 假设该+/- 30度的范围对应于0度至60度的范围。 作为示例,将波形控制在0度至28度的范围内的相电流的峰值。 对产生旋转磁场的一次磁通的目标相位进行相电流的校正。 这改善了由于相移而导致的扭矩下降,并且在将平均转矩保持在高水平的同时减小了扭矩波动。 本发明的系统可以任意调节同步电动机(40)的转矩波形,从而自由地控制同步电动机(40)的转矩特性。

    Method of determining electrical angle and apparatus for the same
    3.
    发明授权
    Method of determining electrical angle and apparatus for the same 失效
    确定电角度的方法及其设备

    公开(公告)号:US5955860A

    公开(公告)日:1999-09-21

    申请号:US880163

    申请日:1997-06-24

    IPC分类号: G01R31/34 H02P6/18 H02P1/46

    CPC分类号: H02P6/185

    摘要: The prior art technique should return the voltage applied to a synchronous motor to zero in the process of measurement of an electrical angle. This causes foreign noises. The structure of the present invention utilizes the fact that the electrical angle of a three-phase synchronous motor 40 depends upon the inter-coil inductances. The procedure of the present invention applies a predetermined voltage for measurement to each combination of coils, and measures variations in electric currents flowing through the respective coils. The electric current flowing through each coil is attenuated in the presence of a driving current in the three-phase synchronous motor 40, compared with the case in the absence of a driving current. The procedure of the present invention accordingly refers to a table 122A to correct the observed values of electric currents based on the variations in electric currents, and refers to another table 122B to read the electrical angle .pi. corresponding to the corrected values of electric currents. The structure of the present invention can determine the electrical angle without returning the driving current to zero, thereby shortening the time period required for determination of the electrical angle while preventing the occurrence of foreign noises.

    摘要翻译: 现有技术在电角度的测量过程中将施加到同步电动机的电压返回到零。 这会引起外界的噪音。 本发明的结构利用三相同步电动机40的电角度取决于线圈间电感的事实。 本发明的程序将用于测量的预定电压施加到每个线圈组合,并且测量流过各个线圈的电流的变化。 与没有驱动电流的情况相比,在三相同步电动机40中存在驱动电流的情况下,流过每个线圈的电流被衰减。 因此,本发明的方法是指根据电流的变化校正电流的观测值的表122A,并且是指另一个表122B来读取与修正的电流值对应的电角度pi。 本发明的结构可以在不将驱动电流返回到零的情况下确定电角度,从而缩短了确定电角度所需的时间,同时防止了外来噪声的发生。