Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1988-04-13
1989-02-28
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318808, H02P 540
Patent
active
048089036
ABSTRACT:
A vector control system for an induction motor driven by a power converter which generates three phase ac currents containing harmonics. In the system, an exciting current command value and a torque current command value in a rotating magnetic field coordinate system are applied, induction motor primary currents in a stator coordinate system is detected at a period which is the same or integral multiple of that of the harmonic components by integration operation, the detected value of the integrated primary currents is subjected to definite integration over the same time interval as the period thereof thereby detecting fundamental wave components of the primary currents without the harmonic components, the fundamental wave components are transformed in the form of rotating magnetic field coordinate system thereby detecting an exciting current component and a torque current component, a deviation between the exciting current command value and the detected actual exciting current component and a deviation between the torque current command value and the detected actual torque current component are detected respectively, and producing and applying to the power converter three phase ac voltage command values in the stator coordinate system tending to reduce the deviations to zero.
REFERENCES:
patent: 4593240 (1986-06-01), Blaschke
patent: 4628475 (1986-12-01), Azusawa et al.
patent: 4680526 (1987-07-01), Okuyama et al.
Matsui Takayuki
Okuyama Toshiaki
Sukegawa Takashi
Takahashi Jun-ichi
Hitachi , Ltd.
Smith Jr. David
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