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    • 14. 发明公开
    • A method and a circuit system for detecting the speed of rotation of a DC motor
    • Verfahren und Schaltkreis zur Ermittlung der Drehzahl eines Gleichstrommotors
    • EP0712001A1
    • 1996-05-15
    • EP95202959.3
    • 1995-11-02
    • FINMECCANICA S.p.A. AZIENDA ANSALDO
    • Bobbio, Attilio
    • G01P3/46H02P5/178
    • G01P3/46H02P7/2985
    • The method described allows the speed of rotation of a DC motor having separate exitation to be detected utilising only electrical quantities of the motor and the associated control circuitry. It provides for the detection of the armature current (Ia) and exitation current (Ie), the average armature voltage (VM) and a quantity proportional to the exitation flux (φ), and the formation of the product between the armature current (Ia) and the resistance (Ra) of the armature circuit to obtain the ohmic voltage drop (VR) across the armature circuit, taking the difference between the average armature voltage (VM) and the voltage drop (VR) across the armature circuit and forming the ratio between the said difference and the exitation flux (φ) whereby to obtain a quantity proportional to the speed of rotation (n) of the motor. For application to electric traction vehicles the exitation current (Ie) is assumed as the quantity proportional to the exitation flux. A circuit system for putting the above indicated method into practice is also described.
    • 所描述的方法允许仅使用电动机和相关联的控制电路的电量来检测具有独立的驱动的直流电动机的旋转速度。 它提供检测电枢电流(Ia)和排出电流(Ie),平均电枢电压(VM)和与排出通量(phi)成比例的量,以及电枢电流(Ia)之间的乘积的形成 )和电枢电路的电阻(Ra),以获得电枢电路两端的欧姆电压降(VR),取得电枢电路两端的平均电枢电压(VM)和电压降(VR)之差,形成 所述差和所述驱动通量(phi)之间的比率,从而获得与所述电动机的旋转速度(n)成比例的量。 对于电力牵引车辆的应用,假定电流(Ie)为与励磁通量成比例的量。 还描述了用于实施上述方法的电路系统。