Electricity: motive power systems – Linear-movement motors
Patent
1981-03-06
1983-04-26
Smith, Jr., David
Electricity: motive power systems
Linear-movement motors
318687, 104292, 246182C, H02P 540, H02K 4100
Patent
active
043814786
ABSTRACT:
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.
REFERENCES:
patent: 3891833 (1975-06-01), Rhoton et al.
patent: 3904942 (1975-09-01), Holz
patent: 3974778 (1976-08-01), Black et al.
patent: 4142700 (1979-03-01), Ubel
Ikeda Haruo
Koike Shigeyoshi
Nakamura Kiyoshi
Saijo Takashige
Hitachi , Ltd.
Japanese National Railways
Smith Jr. David
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