Method and arrangement in connection with slip-ring machine
AssigneeABB AB
InventorJouko Niiranen
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Abstract
An arrangement and a method for starting a slip-ring machine, the arrangement comprising a frequency converter arranged to be connected between a supply network and a rotor of the slip-ring machine for controlling the slip-ring machine, and starting means for starting the slip-ring machine. The starting means are arranged between the frequency converter and the rotor of the slip-ring machine, whereby the frequency converter is arranged to control the magnitude of the current of the rotor of the slip-ring machine in connection with starting the slip-ring machine.
Claims6
An arrangement for starting a slip-ring machine, the arrangement comprising
- a frequency converter arranged to be connected between a supply network and a rotor of the slip-ring machine for controlling the slip-ring machine, and
- starting means for starting the slip-ring machine, wherein the starting means are arranged between the frequency converter and the rotor of the slip-ring machine, whereby the frequency converter is arranged to control the magnitude of the current of the rotor of the slip-ring machine in connection with starting the slip-ring machine.
A method of starting a slip-ring machine, whereby in connection with the slip-ring machine are arranged
- a frequency converter arranged to be connected between a supply network and a rotor of the slip-ring machine for controlling the slip-ring machine, and
- starting means for starting the slip-ring machine, the starting means being arranged between the rotor of the slip-ring machine and the frequency converter, wherein the method comprises the steps of
- feeding a voltage having a substantially constant frequency to a stator of the slip ring machine,
- controlling the magnitude of the current of the rotor by a frequency converter, and
- short-circuiting the coupling means when the rotor reaches a predetermined rotating speed so that the rotor of the slip-ring machine is directly coupled to an output of the frequency converter.
Dependencies are inferred from the claim text.