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    Motor control apparatus and method of controlling motor
    2.
    发明授权
    Motor control apparatus and method of controlling motor 有权
    电动机控制装置及其控制方法

    公开(公告)号：US5952810A

    公开(公告)日：1999-09-14

    申请号：US157619

    申请日：1998-09-21

    申请人： Eiji Yamada ,  Yasutomo Kawabata

    发明人： Eiji Yamada ,  Yasutomo Kawabata

    IPC分类号： B60L11/14 ,  H02P6/18 ,  H02P6/20 ,  H02P21/00 ,  H02P27/04 ,  H02P27/06 ,  H02P1/46

    CPC分类号： B60L11/1803 ,  B60L11/123 ,  B60L11/1851 ,  B60L15/025 ,  B60L15/20 ,  H02P6/18 ,  H02P6/20 ,  B60L2220/14 ,  Y02T10/6217 ,  Y02T10/643 ,  Y02T10/7005 ,  Y02T10/705 ,  Y02T10/7077 ,  Y02T10/72 ,  Y02T10/7275

    摘要： The object of the present invention is to provide a technique that detects an electrical angle of a synchronous motor with a high accuracy and adequately controls the synchronous motor even when the synchronous motor is driven under a non-loading condition. The direction that passes through a rotating shaft of the motor and causes a magnetic flux to pass through permanent magnets is defined as a d-axis. Even when the motor is driven under the non-loading condition and no flow of electric currents through windings is required in response to a torque requirement, the method of the present invention applies a voltage to the d-axis, based on an estimated electrical angle. Application of the voltage is realized by switching on and off a transistor inverter with a delay of a dead time. The method solves voltage equations with the applied voltages and the electric currents corresponding to the voltages, and controls the motor while correcting the electrical angle with errors of the arithmetic operations. A dead-time correction is carried out prior to the solution of the voltage equations, based on the direction of the flow of the electric current through the d-axis. This eliminates the effects of the dead time on the switching operations.

    摘要翻译： 本发明的目的是提供一种即使在非负载状态下驱动同步电动机的情况下也能够高精度地检测同步电动机的电角度并充分地控制同步电动机的技术。 通过电动机的旋转轴并使磁通量通过永磁体的方向被定义为d轴。 即使当电动机在非负载状态下被驱动并且响应于转矩要求而不需要通过绕组的电流时，本发明的方法基于估计的电角度向d轴施加电压 。 电压的施加是通过在延迟死区时间来接通和关断晶体管逆变器来实现的。 该方法利用所施加的电压和对应于电压的电流来解决电压方程，并且通过算术运算的误差来校正电角度来控制电动机。 基于电流通过d轴的流动的方向，在解决电压方程之前执行死区时间校正。 这消除了死区时间对切换操作的影响。

    Electrical angle-detecting apparatus and driving system of synchronous motor using the same
    7.
    发明授权
    Electrical angle-detecting apparatus and driving system of synchronous motor using the same 失效
    电动角度检测装置和同步电动机的驱动系统

    公开(公告)号：US5608300A

    公开(公告)日：1997-03-04

    申请号：US328063

    申请日：1994-10-24

    申请人： Yasutomo Kawabata ,  Eiji Yamada ,  Tetsuya Miura ,  Yoshiaki Taga

    发明人： Yasutomo Kawabata ,  Eiji Yamada ,  Tetsuya Miura ,  Yoshiaki Taga

    IPC分类号： H02P6/20 ,  B60L11/18 ,  B60L15/02 ,  H02P6/16 ,  H02P6/18 ,  H02P6/22

    CPC分类号： B60L11/1807 ,  B60L15/025 ,  H02P6/185 ,  H02P6/22 ,  B60L2220/14 ,  H02P6/182 ,  Y02T10/643 ,  Y02T10/7005

    摘要： The present invention provides a system for detecting a rotational orientation or electrical angle of a rotor without any specific sensor so as to efficiently control a synchronous motor even while the rotor is at a stop or rotates at a relatively low speed. An electrical angle of a rotor (50) is determined according to a previously stored relationship between inductances of different interphases and electrical angles. At a first step, an electrical angle .phi. is calculated either in a range of 0 through .pi. or in a range of .pi. through 2.pi. by approximation. At a second step, a range where the electrical angle .phi. belongs to is specified by taking advantage of asymmetrical property of a maximum current in response to a voltage applied to each interphase. An equivocal electrical angle .theta. is then determined in a range of 0 through 2.pi.. In order to control the driving current of a three-phase synchronous motor (40) at better efficiency, a preferable system of the invention determines the electrical angle according to the above method while the rotor (50) is under inactivating condition or rotates at a speed of less than a predetermined rotating speed, and detects the electrical angle with a reverse electromotive voltage while the rotor (50) rotates at a speed of not less than the predetermined rotating speed.

    摘要翻译： 本发明提供了一种用于检测没有任何特定传感器的转子的旋转取向或电角度的系统，以便即使在转子停止或以相对低的速度旋转时也能有效地控制同步电动机。 根据先前存储的不同相间电感和电角度的关系确定转子（50）的电角度。 在第一步骤中，通过近似，在0至pi的范围内或在pi至2π的范围内计算电角度phi。 在第二步骤中，通过利用响应于施加到每个相间的电压的最大电流的不对称性来指定电角度phi所属的范围。 然后在0至2π的范围内确定不明确的电角度θ。 为了以更高的效率来控制三相同步电动机（40）的驱动电流，本发明的优选系统根据上述方法确定电角度，同时转子（50）处于失活状态或在一个 速度小于预定转速，并且当转子（50）以不小于预定旋转速度的速度旋转时，用反向电动势检测电角度。

    Brushless motor with greater efficiency
    8.
    发明授权
    Brushless motor with greater efficiency 失效
    无刷电机效率更高

    公开(公告)号：US5157298A

    公开(公告)日：1992-10-20

    申请号：US508473

    申请日：1990-04-13

    申请人： Yasutomo Kawabata

    发明人： Yasutomo Kawabata

    IPC分类号： H02K21/16

    CPC分类号： H02K21/16

    摘要： A brushless motor energized by an M-phase alternating current having a stator with M.multidot.m (m is an even number) teeth, a coil wound around each of the teeth, and a rotor with (M+1).multidot.m permanent magnets. Since the coil is wound around each tooth, cancellation of magnetic fluxes produced by adjacent coils is minimized, which results in a greater efficiency of the motor. Since one coil corresponds to less than one magnet, irregularity on the induced voltage of the coils barely occurs, which results in a smoother output torque of the motor.

    摘要翻译： 由具有M×m（m为偶数）的定子的M相交流电驱动的无刷电动机，绕每个齿的线圈和具有（M + 1）×m个永磁体的转子。 由于线圈绕在每个齿周围，所以相邻线圈产生的磁通量的消除被最小化，这导致电动机的效率更高。 由于一个线圈对应于少于一个磁体，所以线圈的感应电压的不规则几乎不发生，这导致电机的更平滑的输出转矩。