WOUND ROTOR BRUSHLESS DOUBLY-FED MOTOR
First Claim
1. A wound rotor brushless doubly-fed motor, wherein a stator comprises two sets of three-phase windings and the number of pole pairs is p1 and p2 respectively, and a rotor comprises a multi-phase wound winding and phase number m is satisfied with the relation m=(p1+p2)/mk, in which, when p1+p2 is odd, mk=1 and when p1+p2 is even, mk=2;
- rotor slots are evenly distributed along the circumference of the air gap and rotor slot number Z′
is satisfied with the relation Z′
=n(p1+p2), in which n is a positive integer;
rotor winding coils are multi-turn structure, coil number of each phase winding is nmk and each coil has the same span, but turn ratios among the coils are different;
when the phase winding coils number ≦
nmk, all coils within the phase winding are automatically connected in short after being connected in series.
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Abstract
A wound rotor brushless doubly-fed motor includes a stator and a rotor. The stator includes two sets of three-phase windings and the number of pole pairs is p1 and p2 respectively. The rotor includes a multi-phase wound winding and phase number m is satisfied with the relation m=(p1+p2)/mk, in which, when p1+p2 is odd, mk=1; when p1+p2 is even, mk=2. Rotor slots are evenly distributed along the circumference of the air gap and the number of the rotor slots Z′ is satisfied with the relation Z′=n(p1+p2), in which n is a positive integer. Rotor winding coils are multi-turn structure, coil number of each phase winding is nmk and each coil has the same span, but turn ratios among the coils are different. When the phase winding coils number ≦nmk, all coils within the phase winding are automatically connected in short after being connected in series. The advantage of this invention is that the winding coil span can be changed flexibly and number of turns of each coil may be different so as to weaken high-order harmonics to the maximum extent.
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Citations
5 Claims
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1. A wound rotor brushless doubly-fed motor, wherein a stator comprises two sets of three-phase windings and the number of pole pairs is p1 and p2 respectively, and a rotor comprises a multi-phase wound winding and phase number m is satisfied with the relation m=(p1+p2)/mk, in which, when p1+p2 is odd, mk=1 and when p1+p2 is even, mk=2;
- rotor slots are evenly distributed along the circumference of the air gap and rotor slot number Z′
is satisfied with the relation Z′
=n(p1+p2), in which n is a positive integer;
rotor winding coils are multi-turn structure, coil number of each phase winding is nmk and each coil has the same span, but turn ratios among the coils are different;
when the phase winding coils number ≦
nmk, all coils within the phase winding are automatically connected in short after being connected in series. - View Dependent Claims (2, 3, 4, 5)
- rotor slots are evenly distributed along the circumference of the air gap and rotor slot number Z′
Specification