Synchronous brushless multipolar machine having immobile armature and field windings
View Patent ↗A synchronous multipolar brushless machine includes an immobile stator armature and field windings, which are placed concentrically around a shaft and radially inwardly positioned relative to the stator armature, on a power unit carrying disc, so that the field windings and armature windings form a mechanically connected unit which generates an excitation magnetic field, and in which an alternate voltage is generated. The excitation magnetic field is transferred to a rotor via labyrinth shaped first and second air gaps. A multipolar rotating magnetic field is generated around the stator armature while the synchronous machine is operated, thereby magnetizing the rotor. In order to reduce magnetic flux resistance, a ferromagnetic tolerance ring is inserted in each first and second air gap. Alternatively, a ferrofluid is provided in each first and second air gap, which significantly increases the magnetic conductivity.
1. A synchronous brushless multipolar machine comprising:
a shaft serving also as a field yoke;
a rotor mounted to the shaft via first and second bearings and including a first rotor main body and a second rotor main body mutually connected by means of a nonmagnetic fixing ring;
a power unit carrying disc made of a ferromagnetic material and fixed on the shaft by means of a first screw;
a field coil fixed on the power unit carrying disc via a holding cylinder;
a stator armature having a magnetic core, fixed on the power unit carrying disc via a nonmagnetic carrying ring; and
armature windings wound on the stator armature;
wherein the stator armature, the armature windings and the field coil form a compact unit attached on the power unit carrying disc by means of a second screw.
2. A synchronous brushless multipolar machine according to claim 1 , wherein the second rotor main body of the rotor integrally includes a second labyrinth ring as a unit, the power unit carrying disc integrally includes a labyrinth ring arranged in a concentric manner as a unit, and the second labyrinth ring of the rotor and the labyrinth ring of the unit carrying disc form a second air gap, through which a magnetic flux is transferred between the labyrinth ring and the second rotor main body of the rotor having the second polar teeth serving as a second magnetic pole.
3. A synchronous brushless multipolar machine according to claim 1 , wherein the power unit carrying disc includes the field coil, the stator armature and the armature windings as the unit, which is detachable from the synchronous machine by unscrewing the first screw, without disassembling the shaft and the rotor.
4. A synchronous brushless multipolar machine according to claim 2 , wherein the power unit carrying disc includes the field coil, the stator armature and the armature windings as the unit, which is detachable from the synchronous machine by unscrewing the first screw, without disassembling the shaft and the rotor.
5. A synchronous brushless multipolar machine according to claim 1 , wherein the shaft integrally includes a labyrinth ring arranged in a concentric manner as a unit, the first rotor main body integrally includes a first labyrinth ring as a unit, the labyrinth ring of the shaft and the first labyrinth ring of the rotor form a first air gap, through which the magnetic flux is transferred between the labyrinth ring of the shaft and the first labyrinth ring of the rotor, and the first labyrinth ring of the rotor and the labyrinth ring of the shaft are arranged so as to avoid a contact therebetween, so as to allow the rotor to be freely rotatable while increasing a cross section of the first air gap through which the magnetic flux is transferred between the shaft and the first rotor main body having first polar teeth serving also as a first magnetic pole.
6. A synchronous brushless multipolar machine according to claim 1 , wherein each of the labyrinth ring of the shaft and the labyrinth ring of the power unit carrying disc has a specifically constructed ring-shaped groove, and specifically constructed ferromagnetic tolerance rings are provided in the grooves of the labyrinth ring of shaft and the labyrinth ring of the power unit carrying disc, respectively.
7. A synchronous brushless multipolar machine according to claim 2 , wherein each of the labyrinth ring of the shaft and the labyrinth ring of the power unit carrying disc has a specifically constructed ring-shaped groove, and specifically constructed ferromagnetic tolerance rings are provided in the grooves of the labyrinth ring of shaft and the labyrinth ring of the power unit carrying disc, respectively.
8. A synchronous brushless multipolar machine according to claim 3 , wherein each of the labyrinth ring of the shaft and the labyrinth ring of the power unit carrying disc has a specifically constructed ring-shaped groove, and specifically constructed ferromagnetic tolerance rings are provided in the grooves of the labyrinth ring of shaft and the labyrinth ring of the power unit carrying disc, respectively.
9. A synchronous brushless multipolar machine according to claim 4 , wherein each of the labyrinth ring of the shaft and the labyrinth ring of the power unit carrying disc has a specifically constructed ring-shaped groove, and specifically constructed ferromagnetic tolerance rings are provided in the grooves of the labyrinth ring of shaft and the labyrinth ring of the power unit carrying disc, respectively.
10. A synchronous brushless multipolar machine according to claim 5 , wherein each of the labyrinth ring of the shaft and the labyrinth ring of the power unit carrying disc has a specifically constructed ring-shaped groove, and specifically constructed ferromagnetic tolerance rings are provided in the grooves of the labyrinth ring of shaft and the labyrinth ring of the power unit carrying disc, respectively.
11. A synchronous brushless multipolar machine according to claim 1 , wherein each of the labyrinth ring of the shaft and the labyrinth ring of the power unit carrying disc has a specifically constructed ring-shaped groove, in which a ferrofluid is provided.
12. A synchronous brushless multipolar machine according to claim 2 , wherein each of the labyrinth ring of the shaft and the labyrinth ring of the power unit carrying disc has a specifically constructed ring-shaped groove, in which a ferrofluid is provided.
13. A synchronous brushless multipolar machine according to claim 3 , wherein each of the labyrinth ring of the shaft and the labyrinth ring of the power unit carrying disc has a specifically constructed ring-shaped groove, in which a ferrofluid is provided.
14. A synchronous brushless multipolar machine according to claim 4 , wherein each of the labyrinth ring of the shaft and the labyrinth ring of the power unit carrying disc has a specifically constructed ring-shaped groove, in which a ferrofluid is provided.
15. A synchronous brushless multipolar machine according to claim 5 , wherein each of the labyrinth ring of the shaft and the labyrinth ring of the power unit carrying disc has a specifically constructed ring-shaped groove, in which a ferrofluid is provided.
16. A synchronous brushless multipolar machine according to claim 1 , wherein a wind power-plant wing is directly attached on the rotor by means of a screw in an eccentric manner relative to a rotational axis of the rotor.
17. A synchronous brushless multipolar machine according to claim 1 , wherein the shaft includes an elongated center hole, through which a center shaft of a supporting pole of a power plant is inserted.
18. A synchronous brushless multipolar machine according to claim 2 , wherein the shaft includes an elongated center hole, through which a center shaft of a supporting pole of a power plant is inserted.