Rotor position detection of a brushless DC motor

Details Rotor position detection of a brushless DC motor Rotor position detection of a brushless DC motor

2006-09-12

2009-02-10

Benson, Walter (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Brushless motor closed-loop control

C318S400420

Reexamination Certificate

active

07489096

ABSTRACT:
A method of determining the angular position of the rotor of a brushless direct current motor having a stator with multi-phase windings, control circuitry that provides excitations switched after one another to the motor phases such that the excitations produce stator flux vectors lying in different directions in the full 360 electrical degree range, and a measurement circuit that delivers responses for the phase excitations is provided. The position is estimated by selecting the main excitation stator flux vector which results in the minimal inductivity shown by the measured response, and selecting the two other vectors in the previous and subsequent directions with respect to the direction of the main vector, and by computing the ratio between differences of measured responses for the selected stator flux vectors.

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International Search Report dated Jun. 22, 2005.

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