METHOD AND SYSTEM FOR CONTROLLING AN ELECTRICAL MOTOR WITH TEMPERATURE COMPENSATION

Title:

METHOD AND SYSTEM FOR CONTROLLING AN ELECTRICAL MOTOR WITH TEMPERATURE COMPENSATION

Document Type and Number:

WIPO Patent Application WO/2012/115897

Kind Code:

A3

Abstract:

A temperature estimation module (104) estimates a change in temperature of the magnets associated with the rotor of the motor (117) based on an operational magnetic flux strength that is compared to a reference magnetic flux strength determined at a known- ambient temperature and for a predetermined operating range of the motor. The temperature estimation module (104) or the system (120) establishes a relationship between the estimated change in the temperature and a magnetic torque component of a target output torque of the motor (117) consistent with the predetermined operating range. The current adjustment module (107) or the system (120) adjusts a command (e.g., quadrature-axis current command) for the motor (117) to compensate for shaft torque variation associated with the estimated change in the temperature In conformance with the established relationship.

Inventors:

WU LONG (US)
SHAW ROBERT (US)

Application Number:

PCT/US2012/025796

Publication Date:

April 17, 2014

Filing Date:

February 20, 2012

Export Citation:

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Assignee:

DEERE & CO (US)
WU LONG (US)
SHAW ROBERT (US)

International Classes:

H02P7/00

Foreign References:

US20080036415A1	2008-02-14
US4477763A	1984-10-16
US20100201294A1	2010-08-12
US6646409B2	2003-11-11

Other References: