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US 7,064,503 B2Granted
Active noise compensation
AssigneeSiemens Aktiengesellschaft
InventorsWalter Marx, Hans-Jürgen Tölle, Reinhard Vogel
Life of this patent
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Abstract
A method is for controlling a multi-phase electrical ship propulsion motor that is supplied with electric energy via a power converter. The ship propulsion motor is preferably a permanently excited motor with at least three windings. The phase currents flowing in the windings are controlled via the power converter to minimize the body noise emitted by the electrical ship propulsion motor.
Claims16
A method for controlling a polyphase electrical ship propulsion motor supplied with the electrical power converter, comprising:
- detecting phase currents flowing in the windings of an electrical propulsion motor;
- determining low frequency structure-borne noise signals from detected phase currents;
- generating residual resultant direct current vectors as a function of the determined low frequency structure-borne noise signals to control the residual direct current components to produce a total current of zero;
- and
- controlling DC components of phase currents flowing in the windings via the converter such that noise-producing current components counteract one another in order to lower the structure-borne noise originating from the electrical ship propulsion motor.
2 more elements
Dependencies are inferred from the claim text.