Abb Research Ltd.

Abb Ab

Freddy Magnussen

Sjoerd Bosga

Stefan Valdemarsson

Heinz Lendenmann

Lars E Jonsson

Erik Johansson

Magnus Backman

Rahul Kanchan

Per Larsson

Per-Olof Thureson

Reza Moghaddam Rajabi

Philip C Kiaer

Mats Svensson

Rahul Kancgan

For identifying the machine type of an alternating current machine, a direct current is first applied to the stator for aligning the d-axis of the rotor and the magnetic field direction of the stator. Secondly, a direct current is applied to the stator at a current angle which causes the rotors of a permanent magnet machine and a synchronous reluctance machine to exert torque in different directions. The torque direction of the rotor is detected and the machine type is identified based on the torque direction information. The machine type is recognized as a permanent magnet machine or a synchronous reluctance machine depending on the torque direction. If no torque is detected, then the machine type is recognized as an induction machine.

Machine type identification

A method for evaluating a condition of a switching device. The switching device includes contact parts, an electric motor and a mechanical coupling device for transforming motion from the electric motor to at least one of the contact parts. A self-diagnostic test is performed on a component of the switching device. The test includes making at least one small movement with the electric motor. A switching device includes contact parts, an electric motor, a mechanical coupling device for transforming motion from the electric motor to at least one of the contact parts, and tester for making self-diagnostic tests, wherein the tester makes small motor movements that are a fraction of a full breaking movement, thereby producing data for evaluating a condition of the switching device.

Switching device

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Vasteras, Sweden

Freddy Magnussen