Electricity: motive power systems – Synchronous motor systems
Reexamination Certificate
2009-11-02
2010-06-29
Ro, Bentsu (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
C318S721000, C318S799000
Reexamination Certificate
active
07746023
ABSTRACT:
A position detecting device which can increase accuracy in detecting the pole position of a motor used to perform quick acceleration and deceleration over the range from a zero speed to a high rotation speed, and a synchronous motor driving device using the position detecting device. A position detector detects basic-wave component signals in sensor signals and executes position calculation. A correcting unit calculates signal information representing at least one of a gain, an offset and a phase by a phase detector from the basic-wave component signals detected by an error calculator, and makes correction based on the calculated signal information such that a position detection error is zero.
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Ajima Toshiyuki
Furuyama Bunji
Miyazaki Hideki
Sasaki Masataka
Suwa Tokihito
Crowell & Moring LLP
Hitachi , Ltd.
Paul Antony M
Ro Bentsu
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