Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Synchronizing or phasing control
Reexamination Certificate
2011-05-17
2011-05-17
Leykin, Rita (Department: 2837)
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Synchronizing or phasing control
C318S034000, C318S040000, C318S048000, C318S700000, C318S400010, C318S066000, C318S539000, C074S422000, C074S640000, C074S083000, C310S112000, C310S114000, C310S115000, C701S041000, C701S043000
Reexamination Certificate
active
07944158
ABSTRACT:
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:a) two synchronous motors are used as electric motors;b) the magnet wheels or rotors of the two synchronous motors are rotated or oriented toward one another and are then mechanically coupled in such a way that between their magnetic flux linkages or other magnetic fluxes an angular offset is formed;c) the two synchronous motors are each supplied with or traversed by the same phase currents, from a shared power converter;d) for a pretension torque, a command or reference value is predetermined, and is superposed on a motor torque control value output by a controller, from which a quadrature current component for the current command value is derived;e) a direct current component for the current command value is derived from the predetermined tension torque control value with sign reversal.
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Barinberg Viktor
Jiang Jinsheng
Baumuller Nurnberg GmbH
Foster Frank H.
Kremblas & Foster
Leykin Rita
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