H - Electricity – 02 – P
Patent
H - Electricity
02
P
H02P 6/06 (2006.01)
Patent
CA 2048018
The aim of the present invention is to propose a method for regulating a brushless d.c. motor which permits the current ripple of the motor to be reduced to a minimum. This is achieved by an arrangement in which a switchable semiconductor valve (Tr1, ..., Tr4) of the energized bridge arms is switched off for a period of time ts dependent upon the speed of the motor, when the reference value of the motor current (IM) is reached. Furthermore, by this means, the clocking frequency of the switchable semiconductor valves is minimized; in addition to increasing the service life of the transistors, this helps to considerably reduce motor noise.
a présente invention consiste à proposer une méthode de régulation de moteur cc sans balai qui permet de réduire au minimum l'ondulation de courant du moteur. L'application consiste à réaliser un montage dans lequel un tube à semiconducteurs commutable (Trl, ...' Tr4), dans chacun des bras du pont sous tension, est inhibé pendant un certain temps, en fonction de la vitesse du moteur, lorsque la valeur de référence du courant du moteur (IM) est atteinte. Deplus, grâce à ce moyen, la fréquence de synchronisation des tubes à semiconducteurs commutables est réduite. Ainsi, en plus d'accroître la durée de vie des transistors, le circuit permet de réduire considérablement le bruit du moteur.
Albrecht Kai
Meyer Helmut
Heidelberger Druckmaschinen Aktiengesellschaft
Johnson Douglas S. Q.c.
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