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Baumuller Nurnberg Gmbh

Jinsheng Jiang

Viktor Barinberg

Joachim Holtz

A field-oriented control method for an electric drive comprising a plurality of electric motors, for implementing a tension mechanism, especially for load cable and/or gearing means, using measurements of a polyphase motor actual current. The measured values are transformed into a direct current component and a quadrature current component, based upon a magnetic rotor field or flux angle, in a rotor flux-based d,q coordinate system. The quadrature and direct current components from the actual current are subjected to a comparison with predetermined quadrature and direct current components of a current command value. The method has the following steps:

Controlled electric motor arrangement for a tension mechanism

A method and a control device for braking a variable speed vector controlled induction machine are driven by a pulse width modulation (PWM) inverter, in which the q-current component and the d-current component of the stator current are controlled independently from one another in accordance with a first reference signal (i,*) and a second reference signal (i,*), respectively. For braking, high frequency components are superimposed on the second reference signal (i,*), and the root-mean-square (rms) value (i,) and the average value (i,) of the resultant second reference signal are controlled independently from one another such that the field requirements are met by the average value and high machine losses are produced by the rms value.

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Nürnberg, Germany

Jinsheng Jiang