Danfoss Power Electronics A/s

Vacon Oy

Nicklas Södö

Simo Häkli

Juha Norrena

A method and apparatus for the adaptation of a motor drive system is described. The method includes applying a small signal frequency sweep to a motor drive system wherein the motor drive system includes an inverter, an output filter (e.g. a sine filter) and a motor, acquiring frequency response data in response to said frequency sweep and setting parameters of the motor drive system depending on the acquired frequency response data.

Motor drive adaptation

A method for detecting low impedance condition at an output () of an electrical converter (), a control unit (), a computer program product, and an electrical converter () are presented. The method includes determining () a first current value (I(T)) of a first current (I), and a second current value (I(T)) of the first current (I), and determining () a first current difference (&#x394;I) between the first (I(T)) and the second (I(T)) current values, and comparing () the first current difference (&#x394;I) to a first current difference threshold (I_TH), and if the first current difference (&#x394;I) is of predefined magnitude with respect to the first current difference threshold (I_TH), such as higher, turning off () a first voltage (U) driving the first current (I), such as by switching off a corresponding switch or switches for applying the first voltage (U) to the output ().

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Nordborg, Denmark

Nicklas Södö