Electricity: motive power systems – Limitation of motor load – current – torque or force
Reexamination Certificate
2007-07-24
2007-07-24
Masih, Karen (Department: 2837)
Electricity: motive power systems
Limitation of motor load, current, torque or force
C318S433000, C318S432000, C318S782000, C318S783000
Reexamination Certificate
active
11224876
ABSTRACT:
A system and method of controlling motor temperature is based on computed motor power dissipation and a thermal model of the motor, rather than a measured motor temperature, in a control loop that limits the motor drive to prevent overheating. An ambient temperature sensor senses the ambient temperature near the motor, and a determination is made of the motor power dissipation. The motor winding temperature is estimated based on the sensed ambient temperature and the determined motor power dissipation. A maximum motor power dissipation that would raise the motor temperature to a predetermined maximum temperature value is determined based on the estimated temperature. The motor power dissipation is limited to a value that is below the determined maximum power dissipation.
REFERENCES:
patent: 5539601 (1996-07-01), Farag
patent: 2004/0195989 (2004-10-01), Harriman et al.
Honeywell International , Inc.
Ingrassia Fisher & Lorenz
Masih Karen
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