Fan motor with digital controller for applying substantially constant driving current
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Accused Products
Abstract
An improved fan arrangement features a radial or diagonal fan (370) with which a direct current motor (32) is associated as its drive motor, further comprising a digital control element (23, 24) which executes a program, for controlling the current flowing through the direct current motor (32), which program is so configured that it applies a substantially constant current in the motor (32) in the working rotation speed range of the fan.
47 Citations
28 Claims
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1-19. -19. (canceled)
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20. A method for monitoring a fan, driven by a motor, against malfunction, comprising the steps of:
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regulating the rotation speed of the motor to a specified rotation speed value;
directly or indirectly sensing the motor current of the fan at that rotation speed;
if the sensed motor current exceeds a specified value, generating a specified signal; and
terminating regulation of rotation speed to the specified rotation speed. - View Dependent Claims (21)
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22. A method of monitoring a fan, driven by a motor, against malfunction, comprising the steps of:
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setting the rotation speed of the fan to a first specified value;
at a specified first point in time, switching off the motor of the fan so that its rotation speed decreases in accordance with the energy stored in the rotating mass of the motor and the frictional losses occurring as the rotor rotates;
recording a second point in time, at which the rotation speed of the motor has reached a specified second value that is less than the first specified value;
determining whether a time interval between the first and second points in time is less than a specified time period, and, if so, generating a specified signal. - View Dependent Claims (23)
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24-26. -26. (canceled)
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27. A method for monitoring a fan, driven by a motor, against malfunction, comprising the steps of:
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regulating the rotation speed of the motor to a specified rotation speed value;
directly or indirectly sensing the motor current of the fan at that rotation speed;
if the sensed motor current is less than a specified value, generating a specified signal; and
terminating regulation of rotation speed to the specified rotation speed. - View Dependent Claims (28)
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Specification