Method and circuit arrangement for the sensorless determination of load states of synchronous linear motors
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United States of America Patent
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Jun 19, 2007
Grant Date -
Jan 18, 2007
app pub date -
Aug 26, 2004
filing date -
Sep 5, 2003
priority date (Note) -
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Abstract
The invention relates to a method and to a circuit arrangement used to regulate synchronous linear motors, especially linear drive mechanisms in film drawing systems. The force (F.sub.clip) between the stationary primary part and the moved secondary part is determined in a sensorless manner from the voltages and currents calculated and measured in a frequency converter in a functional block, in such a manner that the integral is calculated from the active power during a time period (t.sub.clip) between two pulses (new.sub.--clip) produced by an overriding control and said integral is divided by the active length (1.sub.zone) of the primary part. Alternatively, the force (F.sub.clip) can also be determined by summation of the voltages in the f-axis in order to reduce the drop in voltage in relation to the resistance (R.sub.str) of the branch in the primary part. Voltages and currents are transformed on the primary part by a co-ordinate system related to the secondary part.
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