Compensation apparatus for prevention of damaging bearing currents in an electrical machine, and a corresponding compensation method
AssigneeSiemens Aktiengesellschaft
InventorARMIN SCHREPFER
Life of this patent
Estimating the term…
Abstract
In an apparatus to increase the service life of bearings in an electric machine, the bearing currents that act on the bearings of the rotor are reduced by the application of a corresponding negative field voltage to the rotor, obtained with the aid of a compensation unit. The reduction of the bearing currents prevents ripple formation in the bearing and increased ageing of the lubricant.
Claims26
A compensation apparatus for prevention of damaging bearing currents in an electrical machine having at least one winding, a housing and a rotor, said apparatus comprising:
- a connection device adapted to connect to at least one winding, to the housing and to the rotor of the electrical machine;
- and
- a voltage production device adapted to produce a compensation voltage for the rotor of the electrical machine as a function of an operating voltage which is applied to the at least one winding of the electrical machine.
An electrical machine having a compensation apparatus for prevention of damaging bearing currents in an electrical machine, said compensation apparatus comprising:
- a connection device adapted to connect to at least one winding, to the housing and to the rotor of the electrical machine;
- and
- a voltage production device adapted to produce a compensation voltage for the rotor of the electrical machine as a function of an operating voltage applied to the at least one winding of the electrical machine.
A method for compensating bearing currents in an electrical machine, comprising the steps of:
- producing a compensation voltage for a rotor of the electrical machine as a function of an operating voltage of the electrical machine, and
- applying the compensation voltage to the rotor of the electrical machine.
A compensation apparatus for prevention of damaging bearing currents, comprising:
- a first connection adapted to be connected to a rotor of an electrical machine;
- a second connection adapted to be connected to a housing of the electrical machine;
- and
- an impedance having a DC resistance and a high frequency reactance which is less than said DC resistance, said impedance being connected between the first connection and the second connection.
An electrical machine having a compensation apparatus for prevention of damaging bearing currents in an electrical machine, said compensation apparatus comprising:
- a first connection adapted to be connected to a rotor of the electrical machine;
- a second connection adapted to be connected to a housing of the electrical machine;
- and
- an impedance having a DC resistance and a high frequency reactance which is less than the DC resistance, said impedance being connected between the first connection and the second connection.
A compensation apparatus for prevention of damaging bearing currents in an electrical machine, comprising:
- a first connection adapted to be connected to a rotor of an electrical machine;
- a second connection adapted to be connected to a potential of a voltage intermediate-circuit converter of the electrical machine;
- and
- an impedance having a DC resistance and a high frequency reactance that is less than said DC resistance, said impedance being connected between said first connection and said second connection.
An electrical machine having a compensation apparatus for prevention of damaging bearing currents in an electrical machine, said compensation apparatus comprising:
- a first connection adapted to be connected to a rotor of the electrical machine;
- a second connection adapted to be connected to a potential of a voltage intermediate-circuit converter of the electrical machine;
- and
- an impedance having a DC resistance and a high frequency reactance that is less than said DC resistance, said impedance being connected between said first connection and said second connection.
Dependencies are inferred from the claim text.