Browsing by Author "Vadell Rivera, Jaime Ernesto"

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    CED: a new method for high speed stepping motor driving
    (IEEE, 1997) Vadell Rivera, Jaime Ernesto; Lira Canguilhem, Ignacio; Dixon Rojas, Juan
    Stepper motors are indexing devices widely used today in microcomputer controlled machines because of their low cost, simplicity, accuracy and repeatability. Even though their speed is presently adequate for many purposes, there is still some room for improving this parameter. In this article, the authors propose a new electrical driving method especially designed for small stepper motors, fed with unidirectional currents. The method is called "controlled energy discharge" (CED) and is based on changing the time response constant of the current due to winding inductance by the addition of a charged capacitor. The theory of the method, its implementation and performance comparisons with traditional control schemes are presented. From these comparisons, the authors' proposal appears to be an excellent alternative for driving stepping motors.
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    Stepping motor driving by controlled-energy discharge
    (1999) Vadell Rivera, Jaime Ernesto; Chiang Sánchez, Luciano Eduardo
    Stepping motors are indexing devices widely used in microcomputer-controlled machines. They have been proven to give excellent results in terms of accuracy and repeatability in many industrial applications. Their main weakness, however, is their relatively low working speeds (when compared to the alternative of servo motors), but this has been changing lately, mainly due to better electrical controller and motor designs. Hence, today there is a wider interchangeability range with servomotors. This paper describes a new electrical driving method for stepping motors based on controlled energy discharge over the motor windings. This method makes use of the fact that the time response of an LR circuit can be improved by the addition of an adequate capacitance. Experimental tests were performed for evaluation purposes. Results obtained show speeds reaching up to 6000 r/min and as much as 90% of the low-speed torque still available at 1000 r/min for a commercial-type stepping motor.