Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2006-10-10
2006-10-10
Lam, Thanh (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S184000
Reexamination Certificate
active
07119472
ABSTRACT:
A very simple and reliable process for cancelling the reaction field (10) induced by a rotor (4) is proposed, wherein the rotor (4) is rotating in a static magnetic field (7) in a static outer core (3), and wherein the rotor (4) comprises at least two conductors (6) aligned substantially parallel to the axis (8) of the rotor (4). The armature reaction (10) is cancelled by means of a set of auxiliary windings (11) located on the static outer core (3) wherein said auxiliary windings (11) are fed with a direct current (DC) cancelling the reaction field (10). Preferentially, the process is applied to a brushless exciter and the auxiliary windings (11) have the same geometry as the conductors (6) of the rotor (4) and are all equally fed with a direct current corresponding to the current induced in the conductors (6) of the rotor (4) when the rotor is rotating in the static magnetic field (7).
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Search Report from DE 103 04 022.6 (Jan. 14, 2004).
Search Report from EP 04 10 0226 (Sep. 28, 2004).
ALSTOM Technology Ltd.
Cermak Adam J.
Cermak & Kenealy LLP
Lam Thanh
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