Method and Device for Compensating Vibrations of an Electrical Machine, and Electrical Machines Comprising One such Device
First Claim
1. A compensation method for compensating vibration of an electrical machine comprising a stator and a moving portion, said stator being subjected to magnetic forces generated by alternating electrical excitation leading to deformation thereof, the method comprising the steps of exciting piezoelectric actuators fixed at predetermined action locations on an outside surface of said stator, said piezoelectric actuators being arranged to produce controlled deformation in said stator to counter the deformation induced by the magnetic forces.
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Accused Products
Abstract
A method of compensating vibration of an electrical machine comprising a stator and a moving portion, said stator being subjected to magnetic forces generated by alternating electrical excitation and leading to deformation thereof. The method comprises exciting piezoelectric actuators secured at predetermined action locations on the outside surface of the stator, said piezoelectric actuators being arranged to produce controlled deformation in said stator to counter the deformation induced by the magnetic forces.
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Citations
20 Claims
- 1. A compensation method for compensating vibration of an electrical machine comprising a stator and a moving portion, said stator being subjected to magnetic forces generated by alternating electrical excitation leading to deformation thereof, the method comprising the steps of exciting piezoelectric actuators fixed at predetermined action locations on an outside surface of said stator, said piezoelectric actuators being arranged to produce controlled deformation in said stator to counter the deformation induced by the magnetic forces.
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6. A compensation circuit for compensating vibration of an electrical machine comprising a stator and a moving portion, said stator being subjected to magnetic forces generated by alternating electrical excitation produced by electrical power supply means and causing it to be deformed, wherein said circuit comprises:
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plurality of piezoelectric actuators secured at predetermined action locations on an outside surface of said stator, said plurality of piezoelectric actuators being arranged to produce controlled deformation in said stator to counter the deformation induced by the magnetic forces; excitation means (Vpz) for exciting said piezoelectric actuators; and control means for controlling said excitation means synchronously with the electrical power supply means of the machine. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A system for controlling deformation of a stator in an electric motor comprising:
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a plurality of piezoelectric actuators for situating on the stator; and a excitation circuit coupled to said plurality of piezoelectric actuators; said excitation circuit energizing said plurality of piezoelectric actuators to produce controlled deformation in the stator to counter deformation induced by the magnetic forces. - View Dependent Claims (17, 18, 19, 20)
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Specification