Electricity: motive power systems – Synchronous motor systems – Synchronization systems
Reexamination Certificate
2007-11-13
2007-11-13
Masih, Karen (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Synchronization systems
C318S700000, C318S717000, C318S430000, C318S431000, C318S432000, C318S433000
Reexamination Certificate
active
11294500
ABSTRACT:
A rotary sensor that outputs two analog signals, such as one sine wave and one cosine wave and has multiple periods within one period of the electrical angle of a motor is employed. The motor is energized at each position for a specified length of time upon its startup by using multiple electrical angles corresponding to the multiple candidate absolute angles obtained from the rotary sensor signal as the initial position of the motor, and the electrical angle at which the motor acceleration becomes maximum is determined as the absolute angle. While the motor drive is in operation, on the other hand, the phase difference Δθ between the phase of the motor at the counter electromotive voltage and the control phase is directly computed from the parameters of the motor, sensed current, voltage command and angle speed so as to correct the shifted position.
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Abstract of EP0708521 (cited herein as B2), as obtained from escape.net.
Abstract of JP2003299380 (cited herein as B3), as obtained from escape.net.
Ajima Toshiyuki
Kawabata Yukio
Koizumi Osamu
Miyazaki Hideki
Sakamoto Kiyoshi
Crowell & Moring LLP
Hitachi , Ltd.
Masih Karen
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