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Method for compensation of periodic shaking forces in an electrical rotating field machine

  • US 5,808,437 A
  • Filed: 05/12/1997
  • Issued: 09/15/1998
  • Est. Priority Date: 12/02/1994
  • Status: Expired due to Term
First Claim
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1. A method for compensation of periodic shaking forces in an AC-machine having a rotor and a stator that includes a stator winding for combined generation of a torque and a transverse force F which acts perpendicular to the rotor and whose magnitude and direction can be adjusted as desired, the stator winding including a drive winding with a pole pair number p1 and a control winding with a pole pair number p2 that is defined by


  • space="preserve" listing-type="equation">p.sub.2 =p.sub.1 ±

    1,
whereinthe drive winding of the stator winding is supplied with a drive current iS1 for generating a drive flux which can be represented in an electrical p1 -plane by its magnitude and its argument, the p1 -plane being associated with the pole pair number p1 of the drive winding, andthe control winding of the stator winding is supplied with a control current iS2 independently of the drive current iS1, which control current iS2 generates a control flux which can be represented in an electrical p2 -plane by its magnitude and its argument, the p2 -plane being associated with the pole pair number p2 of the control winding, whereina method of controlling the AC machine comprises the steps ofa) determining the argument γ

S.sup.(p1) of the drive flux in the p1 -plane,b) determining, in a coordinate system (T) that is rotating with an angle that corresponds to said argument γ

S.sup.(p1) of the drive flux, the control current iS2*(T,p2) in the p2 -plane necessary for a desired transverse force F*,c) transforming said control current iS2*(T,p2) by a coordinate rotation about a rotation angle p.sup.(p2) into a coordinate system (S) fixed to the stator, said rotation angle being defined by p.sup.(p2) =po.sup.(p2) +γ

S.sup.(p1) wherein po.sup.(p2) denotes a constant angle describing a given relative rotation between the control winding and the drive winding in the stator,the method for compensation comprising compensating shaking forces that act on the rotor, and that are periodically linked with the geometrical drive flux angle or the mechanical rotor angle, by a pre-control of the desired value of at least one of a transverse force, a control current dependent on the drive flux, an angular speed of the drive flux, a mechanical rotor angle, and a mechanical angular speed of the rotor.

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