Electricity: motive power systems – Synchronous motor systems
Patent
1998-03-10
2000-02-15
Masih, Karen
Electricity: motive power systems
Synchronous motor systems
318716, 318705, 318721, 318722, 318798, 318815, H02P 146
Patent
active
060256915
ABSTRACT:
A synchronous motor control system which can freely regulate n-phase electric currents in a synchronous motor to control the characteristics of the synchronous motor. The synchronous motor control system can enhance the output torque per unit weight of a synchronous motor (40) simultaneously with reducing torque ripples. The waveform of three phase alternating currents is freely corrected over a range of +30 degrees from a specified electrical angle, at which a target phase current drawing a sine-wave curve reaches its peak value. It is assumed that this range of .+-.30 degrees corresponds to a range of 0 degree to 60 degrees. By way of example, the waveform is controlled to the peak value of the phase current in a range of 0 degree to 28 degrees. The correction of the phase current is carried out for the target phase which produces the primary magnetic flux of a revolving magnetic field. This improves a fall in torque due to the phase shift and reduces torque ripples while keeping the mean torque at a high level. The system of the invention can arbitrarily regulate the torque waveform of the synchronous motor (40), thereby freely controlling the torque characteristics of the synchronous motor (40).
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Arakawa Toshinobu
Inaguma Yukio
Kanamori Akihiko
Kawabata Yasutomo
Taga, deceased Yoshiaki
Kabushiki Kaisha Toyota Chuo Kenkyusho
Masih Karen
Toyota Jidosha & Kabushiki Kaisha
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