Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1991-03-18
1993-07-27
Shoop, Jr., William M.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318809, 363 37, H02P 540
Patent
active
052313395
ABSTRACT:
In a slip frequency control system hitherto widely employed as a control system for an induction motor type electric rolling stock (in which a slip frequency is determined from a current deviation, an inverter frequency is calculated from the slip frequency and a motor rotation frequency, and the inverter frequency is multiplied by a predetermined correction factor to determine a modulation rate, thereby operating an inverter), a motor output torque decreases in a low speed region. It is difficult to make the correction for this decrease of torque by detecting the torque. In the present invention made considering that a torque curve and sin .phi. (.phi.: the internal impedance angle of a motor) obtained from the result of simulation resemble each other, the decrease of sin .phi. is regarded as being the decrease of torque and a voltage to frequency ratio is corrected so as to compensate for the decrease of sin .phi..
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Technical Report of the Institute of Electrical Engineers of Japan (II), No. 109, p. 39.
Asaba Sadao
Kawatsu Shigeo
Kishimoto Yasuharu
Nakata Kenichi
Cobeca John W.
Hitachi , Ltd.
Hitachi Techno Engineering Co. Ltd.
Shoop Jr. William M.
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