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Assigneeebm-papst St. Georgen GmbH & Co. KG
InventorKonstantin DORNHOF
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An electronically commutated motor (ECM) often employs a Hall sensor for reliable operation. Even when a Hall sensor is omitted from a motor having a plurality of stator winding phases (24, 26) and a permanent-magnet rotor (22), one can reliably detect direction of rotation of the rotor by the steps of: (a) differentiating a voltage profile obtained by sampling either (1) induced voltage in a presently currentless phase winding or (2) voltage drop at a transistor, through which current is flowing to a presently energized phase winding, and (b) using such a differentiated signal (du—24″/dt, du—26″/dt) to control current flow in an associated phase winding. In this manner, one obtains reliable commutation, even if the motor is spatially separated from its commutation electronics.
A method of sensing the direction of rotation in an electronically commutated motor (ECM) having a stator with a plurality of phases (24, 26) and a permanent-magnet rotor (22), which rotor (22), during its rotation, induces voltages in the phases (24, 26) of the stator,
A method of sensorless control of commutation in an electronically commutated motor, which motor comprises a stator having at least one phase (24, 26) and a permanent-magnet rotor (22), the latter inducing, during its rotation, a voltage (FIG. 12:
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Dependencies are inferred from the claim text.