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US 9,425,716 B2Granted
Method for examining an electric energy accumulator
AssigneeSSB Wind Systems GmbH & Co. KG
InventorHermann Kestermann
Life of this patent
Estimating the term…
Abstract
A method for checking an electric energy storage device for a blade angle adjustment drive of a wind turbine. The method includes blocking an electric motor, loading an electric energy storage device from the blocked electric motor by means of a converter; and observing the discharging of the electric energy storage device.
Claims16
A method for checking an electric energy storage device for a blade angle adjustment drive of a wind turbine, wherein the blade angle adjustment drive includes an electric motor having a motor shaft for adjusting an angle of a blade of the wind turbine, the method comprising:
- using a control unit to generate an electrical signal to controllably move a braking component into frictional contact with a brake disc operably associated with the motor shaft of the electric motor to provide a braking action on the motor shaft, and thereby preventing rotation of the blade of the wind turbine;
- loading an electric energy storage device using the electric motor with a converter, while rotation of the motor shaft of the electric motor is being physically prevented by frictional contact of the braking component with the motor shaft;
- observing a discharging of the electric energy storage device while rotation of the motor shaft is being physically prevented;
- and
- detecting a time course during which the discharging is taking place to produce time course data for an electrical signal relating to the discharging of the electric storage energy device, wherein the electrical signal relates to at least one of an intermediate circuit voltage associated with the converter or a current being drawn by the motor from an output stage of the converter, while the braking component is frictionally engaged with the motor shaft to simulate a load.
2 more elements
A blade angle adjustment drive for a wind turbine comprising:
- a converter having a direct voltage intermediate circuit adapted to be electrically fed by a primary power supply;
- an electric motor which is electrically coupled to the converter and adapted to be supplied with electric energy by the converter;
- and
- an electric energy storage device, by which the electric motor is supplied with electric energy using the intermediate circuit when the primary power supply fails;
- a braking component adapted to be moved into physical engagement with a motor shaft of the electric motor to provide a braking action on the motor shaft, to thus enable the electric motor to be used as a load component, while the motor shaft is physically braked by the braking component, during testing of the energy storage device;
- wherein the intermediate circuit is adapted to be electrically separated from the primary power supply without preventing further use of the converter with the electric energy storage device;
- when the primary power supply is separated from the intermediate circuit, the electric energy storage device is adapted to be electrically loaded by the converter and the electric motor as a result of the motor shaft being braked by the braking component;
- a discharging of the electric energy storage device, while being loaded by the electric motor as the motor shaft of the electric motor is being braked, is adapted to be observed;
- and
- a time course during which the discharging is occurring is determined to produce time course data for an electrical signal pertaining to the discharging of the electric energy storage device while the braking component is physically engaged with the motor shaft to simulate a load;
- and
- wherein the electrical signal comprises at least one of an intermediate circuit voltage associated with the converter or a current being output from an output stage of the converter.
9 more elements
A blade angle adjustment drive for a wind turbine comprising:
- a control unit;
- a converter having a direct voltage intermediate circuit adapted to be electrically fed by a primary power supply;
- an electric motor which is electrically coupled to the converter and adapted to be supplied with electric energy by the converter;
- an electric energy storage device configured to be switched, in response to a signal from the control unit, to supply the electric motor with electric energy, using the intermediate circuit, when the primary power supply fails;
- a braking component, controlled by an additional signal from the control unit, to physically engage a motor shaft of the motor to apply a braking action to the motor shaft of the electric motor while discharging of the electric energy storage device is being observed, to thus enable the electric motor to be used as a load component during the discharging of the electric energy storage device;
- wherein the control unit further obtains time course data for an electrical signal pertaining to the electrical energy storage device during the discharging, and while the braking component is physically braking the motor shaft, to simulate a load;
- and
- wherein the electrical signal includes at least one of an intermediate circuit voltage associated with the converter or a current being output by an output stage of the converter.
5 more elements
Dependencies are inferred from the claim text.