The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 15, 2008
Filed:
May. 24, 2006
Alexander Hahn, Sauldorf-Boll, DE;
Alexander Hahn, Sauldorf-Boll, DE;
ebm-Papst St. Georgen GmbH & Co KG, St. Georgen, DE;
Abstract
In this method, the value of a temperature-dependent motor parameter (k) of an electronically commutated motor () is determined during motor operation without a temperature sensor. The motor has a stator () having stator phases (), and a permanent-magnet rotor () coacting with that stator, which rotor induces voltages (U) in the stator phases during operation, a power stage () 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 () is rotating. A value (U) characterizing an induced voltage, and a value (ω) characterizing a rotation speed of the motor, are ascertained. On the basis of those values, the value of the temperature-dependent motor parameter (k) 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.