SU11387A1 - Compensated three-phase motor - Google Patents

Description

The present invention relates to a compensated three-phase current motor and aims to improve the commutator current switching as well as simplify the rotor design by making the rotor in the form of a massive iron cylinder.

In FIG. 1 shows a diagram of a compensated asynchronous motor; FIG. 2, 3 - compensated engine rotor of the proposed design; FIG. 4, 5-rotor of a compensated engine with copper or bronze rings, attached to the end surfaces of the rotor with bolts.

FIG. 1 shows a diagram of a well-known compensated asynchronous motor; it means: S-stator winding, T-winding of the transformer, the wires of which are located in the stator slots collector, B-B-B-brushes, located on the collector of the compensating winding.

Due to the presence of the collector winding R (Fig. 1), it is possible, by displacing the brushes B-B-B, to achieve phase shift compensation in the stator under different engine loads.

If the rotor body of an induction motor is made not from individual iron thin sheets, glued with insulation paper, but in the form of a massive iron cylinder, as shown in FIG. 3, then the squirrel winding R (Fig. 1) may be missing.

Fig 2-3 shows a compensated engine rotor of the proposed design. FIG. 2-3 means: S-stator, R-rotor, made in the form of a massive iron cylinder, /, - drum winding with collector K, B - brush on the collector, W- W - wire bandages to strengthen the winding Rf.

As can be seen from FIGS. 2-3, grooves are embedded in the massive iron rotor, in which wires of the drum winding / are laid. The role of squirrel winding shown in FIG. 1, plays the very body of the iron rotor R ,,,..

Indeed, the stator winding S, streamlined by three-phase current, creates a rotating magnetic field, the power lines of which intersect not only the copper wires of the drum winding, but also the fibers of the massive iron rotor (Fig. 3). As a result, currents flow through the iron core of the massive rotor, the interaction of which with the rotating flow will cause the formation of a torque. Thus, we see that the massive rotor R in FIG. 3 plays the same role as the squirrel wheel in the scheme of FIG. one.

In addition to simplicity, the rotor design, as shown in FIG. 3, it also has the advantage that switching the current on the collector K with this circuit will, generally speaking, be better than with the circuit of FIG. 1. Indeed, the magnetic flux Fz created by the current flowing in the bundle of copper wires embedded in the groove will drastically change its size and direction when moving the respective collector plates under the brush at the moment of switching. These abrupt changes in the magnitude and direction of the flux FZ are detrimental to the switching, causing additional e. d. in the sections of the rotor winding, shorted with a brush.

With the construction of Fig. 2, the flux flux Fz decreases due to the damping effect of the currents flowing in the iron core of the rotor R. Indeed, the oscillation of the flux flux of Fz causes Foucault currents in the iron thickness of the ZZ currents, which tend to weaken the magnitude of the harmful flux Fz that should help improve switching.

In order to reduce the ohmic resistance of the iron massive rotor, it is possible to apply the design according to FIG. 4-5. In these FIG. mean: R-massive iron rotor, Z-Z - iron teeth of the rotor, D-D-copper or bronze rings, attached to the end surfaces of the RZ rotor with bolts A-A.

The end surfaces of the contact between the copper rings Z) -Z) and the iron rotor R ' must be well-worked and, if possible, lost. With this design, the oxides induced in the Z-Z iron teeth will be closed through the D-D copper end rings.

Thus, the rotor design, illustrated in FIG. , it will be similar to a squirrel wheel rotor, with the Z-Z iron teeth playing the role of the squirrel cage copper wires, and the D-D copper or bronze rings will play the role of the end closing rings of the squirrel cage.

The subject of the patent.

1. A compensated three-phase motor, characterized in that the compensating collector winding R of its rotor is placed in the slots of the massive iron core (Figs. 2, 3).

2. Application of copper or bronze rings D, D, bolted A, A to the ends of the rotor (fig. 4, 5), described in section 1 of the engine on the rotor of copper or bronze rings.

FIG. i.