Title:
METHOD FOR OPERATING AN ELECTRONICALLY COMMUTATED MOTOR, AND MOTOR FOR CARRYING OUT ONE SUCH METHOD
Document Type and Number:
WIPO Patent Application WO2003034581
Kind Code:
A3
Abstract:
The invention relates to a method for operating an electronically commutated motor (10) which is provided with a current limiting device acting on a PWM control system (56). During operation, said control system emits PWM pulses (60) with a controllable pulse duty factor (pwm) and an essentially constant frequency. In the event of a pre-determined upper limiting value (Inom; Iw) of the motor current (Iactual) being exceeded, the pulse duty factor (pwm) is modified by means of the current limiting device in order to reduce the motor current (Iactual). In the event of the motor current (Iactual) exceeding a pre-determined upper limiting value (Inom; Iw) during the rotation of the motor (10), said limiting value (Inom; Iw) is increased (fig. 8: Iwmax) during a pre-determined time span (304) using a timer (260), and the available motor power is thus temporarily increased when a peak load occurs. When the rotor (24) is blocked, the limiting value (Inom) is not increased, but rather significantly reduced. The limiting value (Inom) is preferably increased according to the rotational speed of the motor (10), in order to utilize the better motor cooling system during high rotational speeds. The limiting value (Inom) is momentarily increased to a high value when the motor is started (10), in order to enable a reliable start.
Inventors:
HAHN ALEXANDER (DE)
HEYDRICH WALTER (DE)
RAPPENECKER HERMANN (DE)
HEYDRICH WALTER (DE)
RAPPENECKER HERMANN (DE)
Application Number:
PCT/EP2002/008802
Publication Date:
September 18, 2003
Filing Date:
August 07, 2002
Export Citation:
Assignee:
PAPST MOTOREN GMBH & CO KG (DE)
HAHN ALEXANDER (DE)
HEYDRICH WALTER (DE)
RAPPENECKER HERMANN (DE)
HAHN ALEXANDER (DE)
HEYDRICH WALTER (DE)
RAPPENECKER HERMANN (DE)
International Classes:
H02P6/08; H02P6/28; H02P29/02; H02P29/032; (IPC1-7): H02P6/00; H02P6/20; H02P5/17
Foreign References:
| DE19826458A1 | 1999-12-16 | |||
| DE3044027A1 | 1981-08-27 | |||
| US5268623A | 1993-12-07 | |||
| DE19949804A1 | 2000-05-11 |
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