LV11577B - Asynchronous drive for controlling two motors - Google Patents

Abstract

The invention belongs to electrical engineering and may be used in alternative power engineering. The aim of the invention is expansion of functional potential and increase of power delivered to a network.A double motor asynchronous drive consists of two asynchronous motors with phase windings on rotors connected to a common shaft. The invention feature is that the rotor position on the torsion shaft is fixed at a predetermined shift angle, at which single phase rotor windings are connected to single phase rectifiers connected in series with the choke, and attributed to the network single phase invertors (fig.1)<IMAGE>

Description

Asynchronous two-motor drive

The invention relates to electronics and can be used in alternative energy.

Twin-known asynchronous electric drive comprising two induction motors with phase windings of the rotor, which rotors mated to a common shaft, rectifier throttle pulse controller and an active resistance (X. KapHMOB, BC JJynyKanoB. HByx3jpHraTejn> HHH SecKomaKrabiiī aneKiponpHBOH c HMuynbCHhiM peryrapoBaHHeM nacroiH BpaiņeHHa .B c6 .HayqHMX τργιιοΒ: Bonpocw ananroa pgkhmob paCorbi peryjnrpyeMHX ΜεκτροπριίΒοποΒ nepeMeHHoro τοκβ .TaniKeHT, 1978). Such a system provides speed control, but does not allow the energy to be returned to the grid by a rotor.

Known electromagnetic shaft which comprises two induction motors the windings of the rotor chains and three-phase transformers (HM ycMaHXOjĶKaeB, Μ. T. KajīBipoB. K pacnery MexararaecKHX xapaKTepncTHK 3tnexTpoMarBHTHoro pačouero Baaa. 3; ieKTpoTexHHKa 1991 H ^G 10). The system allows the engine speed to be stabilized, but provides power to the grid from the rotors.

The prototype was selected asynchronous two-wheel drive, which contains two asynchronous motors with rotor phase windings on the common shaft, the rotors of which are rotatable with respect to each other and the total active resistance (Β.Π. AHflpeee, K) .A.Ca6nHHH. Ochobh ojieKTponpHBoiļa. Γ3Η, 1963). This drive system allows speed control but does not provide power to the grid from the rotors, which worsens the energy performance.

The object of the invention is to extend the functional capabilities of the drive and increase the power returned to the network.

The object of the invention is achieved as follows: an asynchronous two-motor actuator comprising two asynchronous motors with phase windings in rotors coupled to a common shaft, such that the rotor positions are fixed to each other on the torsion shaft at a given offset angle, bridges closed in series with ballasts and network-related single-phase inverters.

FIG. 1, which shows an asynchronous two-wheel drive according to the invention, the following designations are used:

1,2-asynchronous motors with phase winding on rotors;

- torsion shafts;

- clutch;

5, 8.11 - Single phase rectifier bridges;

6, 9.12 - Chokes;

7,10,13 - Network-related single-phase inverters.

According to the invention, the stators of the asynchronous motors 1,2 are connected to a network in which the rotors with phase windings are mechanically connected to each other by torsion shafts 3, locking the rotor positions relative to one another by means of a clutch 4. The windings of the motor rotor phases A are connected to a single-phase rectifier bridge 5 having a series-connected choke 6 and a network-related single-phase inverter 7. Analogically connected phase B windings with a single-phase bridge 8, a choke 9 and a network-related single-phase inverter 10 a single-phase bridge 11, a choke 12, and a network-related single-phase inverter 13.

The proposed asynchronous two-wheel drive operates as follows. In the generator mode, when the spindle rotation speed exceeds the magnetic rotor rotation speed, the rotor phase windings gain different potentials as they are shifted to each other by the set position angle. This enables the energy from the rotor circuit to be returned to the grid by network-related single-phase inverters, the size of which depends on the speed of rotation and the angle of rotation of the rotors.

The common shaft with torsions reduces the dependence of the rotation speed on the changes of applied torque over time and automatically adjusts the rotor positions.

The technical effect associated with the extended functionalities of the drive is achieved by the return of rotor electromagnetic energy to the grid. In addition, the legality of this energy return is determined by the mutual position of the rotors as a potential regulator.

In addition, torsion shafts reduce current ripple, which increases the power returned to the grid.

Claims (1)

Formula of the Invention The asynchronous two-motor drive, which contains two asynchronous motors with phase windings in rotors coupled to a common shaft, differs in that, in order to expand the functional capability and increase the power returned to the network, the rotor positions are fixed at a given offset angle; connected to single-phase non-controlled rectifier bridges, which are closed in series with ballasts, and network-related single-phase inverters.