Electronically commutated motor
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United States of America Patent
Stats
-
Sep 10, 2002
Grant Date -
N/A
app pub date -
Jun 8, 2001
filing date -
Dec 8, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An electronically commutated motor has a rotor and a stator interacting with one another. A semiconductor control member controls a motor current supplied to the stator. An arrangement is provided that detects values of the motor current which surpass a preset threshold value and generates a first signal upon surpassing the threshold value. An arrangement is provided that determines rotational speed values of the motor, which surpass a preset rotational speed, and generates a second signal upon surpassing the preset rotational speed. An arrangement is provided that combines the first and second signals for generating a combined signal, wherein the combined signal acts substantially without temporal delay on the semiconductor control member and reduces the motor current to a value which is greater than zero.
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