Control system for a linear synchronous motor

H - Electricity – 02 – K

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318/1, 335/1

H02K 41/03 (2006.01) B60L 15/00 (2006.01)

Patent

CA 1166682

ABSTRACT OF THE DISCLOSURE In a magnetic floating type of super high speed transportation system using a linear synchronous motor system as its drive system in which a field magnet is carried on a train and a series of armature coils are provided along a track, a speed of a train is regulated under control of a frequency converter of the variable frequency and voltage type for supplying power to the armature coils. For the speed regulation, a relative position of the field magnet to the armature coils is detected to form a train of position detecting pulses. A reference frequency pattern with a frequency corresponding to a speed command is formed. A phase difference between the reference frequency pattern and the position detecting pulse train is-detected. A propulsion force command of a linear motor is obtained by setting different limit values in the positive and negative parts of the phase difference signal. A sinusoidal current waveform pattern is formed in synchronism with the position detecting pulse train. By multiplying the current waveform pattern by the propulsion force command, a sinusoidal armature current pattern is obtained of which the frequency and the crest value are fixed. The cycloconverter is controlled so as to provide an armature current following the armature current pattern, whereby the vehicle speed accurately follows the speed command.

372335

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