Method for controlling a multiphase electric motor operating in star-connected mode
AssigneeGrundfos Management A/S
InventorJan Caroe Aarestrup
Life of this patent
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Abstract
A method serves for starting a polyphase electric motor which is operated in a star connection. The method conductively bridges at least one winding part of a phase of the motor and electrically disconnects the bridged winding part, in order in this manner, to supply a higher voltage to the remaining, electrically effective windings, and thus to increase the flow of current and thus the torque.
Claims9
-8. (canceled)
A method for activating a polyphase electric motor operated in a star connection, for starting the motor, with which at least one winding part of a phase of the motor is conductively bridged, and the bridged winding part is electrically disconnected.
The method according to claim 1, wherein the bridging and the disconnection are discontinued after the starting of the motor.
The method according to claim 1, wherein the winding parts of several but not all phases of the motor are conductively bridged.
The method according to claim 1, wherein the winding parts of only one phase are conductively bridged.
The method according to claim 1, wherein a complete winding of only one phase is conductively bridged
The method according to claim 1, said activation being carried out by way of electronic switches, preferably triacs.
The method according to claim 1, wherein each winding and the at least one conductive bridging may be connected and disconnected by way of an electronic switch, in particular a triac, and wherein after the disconnection of the bridging, the electronic switches assigned to the windings are activated for speed control or energy optimization of the motor.
The method according to claim 1, wherein said activation is applied to a brushless three-phase d.c. motor, which drives a centrifugal pump or is capable of being applied to such a drive.
Dependencies are inferred from the claim text.