H - Electricity – 02 – P
Patent
H - Electricity
02
P
H02P 6/08 (2006.01)
Patent
CA 2529458
An electric submersible pump contains an AC permanent magnet motor having three or more phases A, B, C and has a drive circuit for supplying varying drive signals to all the phases of the motor at the same time. Each drive signal is constituted by a cyclically smoothly varying voltage applied to the corresponding motor phase during driving of the motor. The circuit comprises switches (902, 903) for each motor phase, a control arrangement for turning the switches (902, 903) on and off at a frequency greater than the frequency of the cyclically smoothly varying voltages, and a filter (907, 908) for filtering the output voltages of the switches (902, 903) to produce the cyclically smoothly varying voltages. Such a drive circuit drives all the phases of the motor continuously such that damaging transients will not arise and without requiring the motor emf or drive signals to be sinusoidal.
L'invention porte sur une pompe électrique submersible comportant un moteur c.a. à aimant permanent, à trois phases A, B, C ou plus, et un circuit de pilotage fournissant simultanément différents signaux de pilotage à toutes les phases du moteur. Chaque signal de pilotage consiste en une tension cyclique à variations lentes s'appliquant à la phase correspondante pendant le fonctionnement du moteur. Ledit circuit comporte des commutateurs (902, 903) pour chacune des phases, un dispositif de commutation des commutateurs (902, 903) à une fréquence supérieure à celle des tensions cycliques à variation lente, et un filtre (907, 908) des tensions de sortie des commutateurs (902, 903) produisant les tensions cycliques à variation lente. Ledit circuit commande continuellement les phases du moteur en empêchant les transitoires dommageables et sans exiger que la FEM du moteur ou des signaux de pilotage soit sinusoïdale.
Marks & Clerk
Weatherford/lamb Inc.
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