Ebm-papst St. Georgen Gmbh & Co Kg

Papst-motoren Gmbh & Co Kg

Thomas Dufner

Arno Karwath

Hermann Rappenecker

Frank Jeske

J&ouml;rg Hornberger

Markus Gutmann

Jörg Hornberger

Frank Heller

Hansj&ouml;rg Kaltenbrunner

Bernhard Martin

Manuel Künstle

A fan arrangement () has a fan () driven by an electric motor (). It further has an apparatus for continuously detecting an actual electrical value associated with the electric motor () during operation, an input apparatus for inputting a desired electrical value for the operation of said electric motor, a comparison apparatus () for comparing said electrical value with the actual electrical value, and a controller which regulates said electrical value by pulse width modulation ().

Fan arrangement in which the consumed electric power is influenced

A fan arrangement () has a fan () driven by an electric motor (), also an apparatus for detecting the electrical power (P) consumed by the electric motor () during operation; an input apparatus () for inputting a desired rotation speed (n) of said electric motor (); a converter () for converting said desired rotation speed (n) into a desired electrical power (P); and a controller (), which regulates the control input controlling the electric motor () in such a way that the difference between the electrical power (P) consumed in operation and the desired electrical power (P) is reduced, in order thereby to improve the air output characteristic curve () of the fan arrangement () at least in a portion of the overall operating range.

Fan arrangement

An electronically commutated motor has a permanent-magnet rotor () having: at least two rotor poles (); at least one phase (); a power stage (); and a rotor position sensor (). Associated therewith is a control circuit implemented to carry out the following steps in order to even out the motor current (): A) after a change of the rotor position signal (), referred to as a first pole change, a first value (I_MEAS(HCnt&#x2212;1)) of the current through the at least one phase () is ascertained; B) after a predetermined time span (T_Default+T_Offset(HCnt&#x2212;1)), a new commutation is carried out; C) after a change of the rotor position signal (), referred to as a second pole change, a second value for the motor current (I_MEAS(HCnt)) is ascertained; D) as a function of the difference between the first value (I_MEAS(HCnt&#x2212;1)) and second value (I_MEAS(HCnt)), the value for the predetermined time span is modified.

Method and arrangement for commutating an electronically commutated motor

In an electronically commutated motor (M), rotor position signals are generated by means of a galvanomagnetic rotor position sensor (). A timer (CNT_HL) brings about an advanced commutation which occurs only once the motor has reached a specific rotation speed, and whose magnitude is a function of the rotation speed.

Electronically commutated motor

The rotation speed of an electric motor ( ) is controlled by a controller ( ) which receives its setpoint from a characteristic function ( ). The characteristic function ( ) calculates a setpoint for the controller ( ) on the basis of an originally analog variable A ( ) that is converted to digital by an A/D converter AD ( ), with the aid of support values of a &ldquo;MEM&plus;DATA&rdquo; characteristic that are stored in a memory ( ); those values not predefined by the support values are calculated by interpolation.

Growing community of inventors

Schonach, Germany

Thomas Dufner