Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2006-07-04
2006-07-04
Masih, Karen (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S801000
Reexamination Certificate
active
07071651
ABSTRACT:
A high-frequency voltage whose amplitude is small is applied as a d-phase command voltage, and an excitation phase is changed to a predetermined degree at predetermined intervals, whereby a motor is driven. As the d-phase command voltage has the small amplitude and high frequency, the rotor of the motor does not rotate. A d-phase feed back current is detected, and the product of a derivative of the d-phase feed back current by the high-frequency voltage command is calculated. A high-frequency component is removed from the product. An excitation phase (direction of a magnetic flux) associated with a deviation of 0 or π from the position of a magnetic flux and also associated with a peak value assumed by the product having the high-frequency component removed therefrom is detected. A plurality of thus detected excitation phases is averaged in order to determine the direction of a magnetic flux. The excitation phase associated with one of two peak values assumed by the product is adopted on a fixed basis. Positive and negative rectangular waves having a magnitude causing magnetic saturation are applied as d-phase voltage commands. The polarity of a magnetic pole is determined based on positive and negative d-phase feed back currents. As the direction of a magnetic flux and the polarity thereof are detected separately from each other, the position of a magnetic pole can be detected accurately and reliably.
REFERENCES:
patent: 5914582 (1999-06-01), Takamoto et al.
patent: 2004/0012367 (2004-01-01), Takahashi et al.
patent: 2004/0178762 (2004-09-01), Manaka
patent: 8-9681 (1996-01-01), None
patent: 10-285989 (1998-10-01), None
patent: 2000-312493 (2000-11-01), None
patent: 2002/84783 (2002-03-01), None
patent: 3312472 (2002-05-01), None
patent: 3312520 (2002-05-01), None
patent: 2002-171798 (2002-06-01), None
Sonoda Naoto
Toyozawa Yukio
Drinker Biddle & Reath LLP
Fanuc LTD
Masih Karen
LandOfFree
Position-of-magnetic-pole detecting device and method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Position-of-magnetic-pole detecting device and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Position-of-magnetic-pole detecting device and method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3546303