H - Electricity – 02 – P
Patent
H - Electricity
02
P
H02P 6/18 (2006.01) H02K 29/00 (2006.01)
Patent
CA 2548498
A method and controller for electronically commutating a permanent magnet brushless dc motor (21) under closed loop control where current is commutated (22) through successive combinations of two out of three stator windings to produce a rotating flux. Commutations are determined by each 60~ angular position of the rotor by sensing the back EMF (24) induced in only one of the three stator windings whenever that winding has no applied current flowing in it to determine the 0~ and 180~ positions and extrapolating the 60~, 120~, 240~ and 300~ positions by dividing the time interval therebetween by a factor of 3.
L'invention concerne un procédé et un dispositif de commande pour commuter électroniquement un moteur à courant continu (21) sans balais à aimant permanent dans une commande en boucle fermée, dans lequel le courant est commuté (22) à travers des combinaisons successives de deux bobinages de stator, ce qui permet de produire un flux de rotation. Les commutations sont déterminées par chaque position angulaire de 60· du rotor, par détection de la force électromotrice (24) arrière induite par un des trois bobinages de stator, ce bobinage n'appliquant pas le courant passant pour déterminer les positions 0· et 180· et les positions d'extrapolation de 60·, 120·, 240· et 300· par division de l'intervalle temporel entre un facteur de trois.
Fisher & Paykel Appliances Limited
Riches Mckenzie & Herbert Llp
LandOfFree
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