| 摘要 |
A method and apparatus for determining the flux vector of a rotating-field machine that enables a rotating-field machine, especially a permanently excited synchronous machine, to be controlled without mechanical transmitter even at low frequencies. An EMF vector is interated in a flux computer to determine a direction angle of a model flux vector. The flux vector rotates a perpendicular correction vector until an oscillating stator current component parallel to the model flux vector generates no corresponding oscillations in the stator current component perpendicular thereto. Preferably, a multiplier forms a correlation signal between the impressed oscillating stator current component and the oscillations in the stator current component perpendicular thereto. The correlation signal indicates the value of the components of the correction vector perpendicular to the model flux vector.
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