Method of operating an electronically commutated motor, and method for carrying out such a method
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United States of America Patent
Stats
-
Jan 15, 2008
Grant Date -
Nov 30, 2006
app pub date -
May 24, 2006
filing date -
May 27, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In this method, the value of a temperature-dependent motor parameter (k.sub.e) of an electronically commutated motor (124) is determined during motor operation without a temperature sensor. The motor has a stator (201) having stator phases (202, 204, 206), and a permanent-magnet rotor (208) coacting with that stator, which rotor induces voltages (U.sub.IND) in the stator phases during operation, a power stage (122) being associated with the stator phases in order to control their energization. In this method, energization of the stator phases is interrupted while the rotor (208) is rotating. A value (U.sub.IND) characterizing an induced voltage, and a value (.omega.) characterizing a rotation speed of the motor, are ascertained. On the basis of those values, the value of the temperature-dependent motor parameter (k.sub.e) is derived. The invention also concerns a motor for carrying out such a method. The method requires no temperature sensor, and can be integrated into an 'embedded program' such as the program otherwise needed for electronic commutation.
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