Electricity: motive power systems – Limitation of motor load – current – torque or force
Reexamination Certificate
2006-10-31
2006-10-31
Donovan, Lincoln (Department: 2837)
Electricity: motive power systems
Limitation of motor load, current, torque or force
C318S432000, C318S471000, C318S472000, C318S480000
Reexamination Certificate
active
07129660
ABSTRACT:
A motor-current square value calculation section45calculates, as a motor-current square value, the sum of respective square values of two phase currents converted from three phase currents flowing through an electric motor. A temperature estimation calculation section44performs low-pass filtering for the motor-current square value, and calculates temperature increases of the mass portion and coils on the basis of the filtered motor-current square value. In the low-pass filtering, filtering calculation is performed in a manner which changes depending on rotational speed RV of the electric motor; i.e., whether the electric motor is in a rotating state or in a stopped state. The temperature increase of the mass portion is added to ambient temperature of the electric motor to thereby estimate temperature of the mass portion, and the temperature increase of the coils is added to the estimated temperature of the mass portion to thereby estimate temperature of the coils. Accordingly, the coil temperature of the electric motor can be accurately detected, and current flowing through the electric motor is properly controlled in accordance with the detected temperature.
REFERENCES:
patent: 5086862 (1992-02-01), Graber et al.
patent: 6246197 (2001-06-01), Kurishige et al.
patent: 6334503 (2002-01-01), Fukumura et al.
patent: 6380706 (2002-04-01), Kifuku et al.
patent: 2004/0249525 (2004-12-01), Okoshi et al.
patent: 2005/0205344 (2005-09-01), Uryu
patent: 2178014 (1994-09-01), None
patent: A 4-71379 (1992-03-01), None
patent: A 8-127351 (1996-05-01), None
patent: A 8-133107 (1996-05-01), None
patent: A 10-67335 (1998-03-01), None
Fujita Shuji
Sakai Atsuo
Donovan Lincoln
Glass Erick
Oliff & Berridg,e PLC
Toyoda Koki Kabushiki Kaisha
Toyota Jidosha & Kabushiki Kaisha
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