System for compensating rotor vibrations

Patent metadata

Field	Value
Publication number	US-10020764-B2
Application number	US-201514868546-A
Country	US
Kind code	B2
Filing date	Sep 29, 2015
Priority date	Sep 30, 2014
Publication date	Jul 10, 2018
Grant date	Jul 10, 2018

Abstract

The present disclosure relates to a system to compensate for mechanical forces on a rotating rotor of an electric machine, to a method for compensating mechanical forces on a rotating rotor of an electric machine, and to a use of a corresponding system. Disclosed is a system for compensating torsions at a rotating rotor. The system includes at least one measuring device for measuring specific properties of the rotor, an analyzer unit for analyzing the measurement data of the measuring device, a compensation means for compensating the torsions at the rotor, the compensation means comprise a power supply unit generating a signal adapted in amplitude and frequency to the measured properties of the rotor, and to apply the generated signal to the rotor, and the power supply unit is a frequency converter.

First claim

The invention claimed is:

1. A system for compensating torsions at a rotating rotor, the system comprising:
at least one cavity projecting through a housing of the rotating rotor;
at least one measuring device comprising at least a high resolution speed transducer arranged in the at least one cavity for measuring speed fluctuations at the rotating rotor to obtain measured data;
an analyser unit for calculating torsional stresses or velocity of deformation of the rotating rotor using the measured data; and
compensation means comprising a power supply unit for supplying an electrical power, adapted in amplitude and frequency to the measured data of the rotating rotor, to the rotating rotor to compensate torsions at the rotating rotor;
wherein the power supply unit is a frequency converter.

2. The system according to claim 1 , wherein the frequency converter is implemented between a generator comprising the rotating rotor and a power grid, to convert to a frequency appropriate for the power grid.

3. The system according to claim 1 , wherein the frequency converter is an additional frequency converter.

4. The system according to claim 1 , wherein the compensation means comprises a mass damper adapted to compensate mechanical forces by mechanical counterforces.

5. The system according to claim 1 , wherein the at least one measuring device measures torsional stress, torsional deformation, and/or torsional vibrations of a shaft of the rotating rotor.

6. The system according to claim 1 , wherein the at least one measuring device comprises at least a strain gauge attached to the rotating rotor, which strain gauge comprises a digital signal processor.

7. The system according to claim 6 , wherein the strain gauge is fixed to the rotating rotor by a tape of cloth from poly-paraphenylene terephthalamide.

8. The system according to claim 1 , wherein the at least one measuring device comprises a contactless sensor.

9. The system according to claim 1 , wherein the system is integrated in a power plant main control system.

10. Use of the system according to claim 1 , wherein the system is at the rotating rotor of an electric machine.

11. A method for compensating torsion at a rotating rotor comprising:
arranging at least one measuring device in at least one cavity projecting through a housing of the rotating rotor;
measuring with the at least one measuring device comprising at least a high resolution speed transducer, speed fluctuations at the rotating rotor to obtain measured data;
calculating using the measured data torsional stresses or velocity of deformation of the rotating rotor with an analyser unit;
generating with a compensation means comprising a power supply unit an electrical power, adapted in amplitude and frequency to the measured data of the rotating rotor; and
supplying via a frequency converter the adapted electrical power to the rotating rotor to compensate the torsion.

Assignees

• Alstom Technology Ltd
• General Electric Technology Gmbh

Inventors

• Oesterheld Joerg
• Alberti Luca
• Cataldi Giovanni

Classifications

• F16F15/10

  Suppression of vibrations in rotating systems by making use of members moving with the system (by balancing F16F15/22 {; yielding couplings F16D3/00} ; with flywheels acting variably or intermittently F16H {; construction providing resilience or vibration-damping for gear elements F16H55/14}) · CPC title

• F16F15/00

  Suppression of vibrations in systems ({damping of non-rotary systems using inertia effect F16F7/10; prevention or isolation of vibrations in machine tools B23Q11/0032; suppression of driveline vibrations in hybrid vehicle transmissions B60W30/20} ; vehicle seat suspension devices B60N2/50; {methods or devices for protecting against, or damping of, acoustic waves, e.g. sound G10K11/16}); Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion ({vibration absorbing or balancing means for aircraft propellers B64C11/008, for rotorcraft rotors B64C27/001} ; testing static and dynamic balance of machines or structures G01M1/00) · CPC title

• H02P9/26 Primary

  using discharge tubes or semiconductor devices (H02P9/34 takes precedence) · CPC title

• G01H1/10 Primary

  of torsional vibrations · CPC title

• F16F15/03

  using {magnetic or} electromagnetic means (F16F9/53, {F16F15/005} take precedence) · CPC title