Electricity: motive power systems – Synchronous motor systems – Brushless motor closed-loop control
Reexamination Certificate
2003-07-02
2008-09-09
Donovan, Lincoln (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Brushless motor closed-loop control
C318S432000, C318S434000, C318S708000
Reexamination Certificate
active
07423395
ABSTRACT:
It is the objective of the present invention to provide a sensorless vector control method and a control apparatus, for an alternating-current motor, that can smoothly restart an alternating-current motor in the free running state.According to the present invention, when a current that flows in an alternating-current motor (2) at a restart time7the alternating-current motor (2) continuously flows at a designated current level or higher for a designated period of time, it is determined that the rotational direction or the velocity of the alternating-current motor (2) is incorrectly estimated, and a direct current or a direct-current voltage is again applied to again estimate the rotational direction and the velocity.
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Iura Hideaki
Nonaka Kazuhiro
Sawamura Mitsujiro
Sueshima Satoshi
Terazono Katsushi
Donovan Lincoln
Glass Erick
Kabushiki Kaisha Yaskawa Denki
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