SU1762378A1 - Two-motor electric drive - Google Patents

Description

(21) 4839429/07

(22) 06/15/90

(46) 09/15/92. Bul Ms 34

(71) Lipetsk Polytechnic Institute

(72) V.N. Meshcherkov

(56) USSR Copyright Certificate No. 1202003, cl. H 02 R 3/24, 1983.

For UK of Great Britain Me 1487557, cl. 1977.

(54) TWO-MOTOR ELECTRIC DRIVE

(57) Usage: in twin-motor electric drives of various production mechanisms with a total load on the shaft. The accuracy of the alignment of the currents of the stators and the moments of the electric motors is increased. Summary of the Invention: The ends of the stator windings 3, 4, 5, 7, 8, 9 of each of the electric motors 1, 2 are connected through current-limiting elements 11-16, which are connected in series and form an annular circuit 17, due to which -5, 7-9 flow the same currents, resulting in alignment of the moments of the electric motors 12. 2 Cp. F-crystals, 1 sludge.

/ 3 4 5

WITH

with

7 V J 2

VI Os Yu SO

3

This invention relates to electrical engineering v. A boundary can be used for two different types of equipment for a variety of production mechanisms, where ale, trogers operate for a common load.

The aim of the invention is to increase nms. the validity of the alignment of the currents of the stator and the life of the dBigatepei.

The drawing does not show the electrical circuit of the twin-engine electric aoaii.

Two-motor electric drive contains two three-phase asynchronous motors 1 and 2, asynchronous motor 1 has windings 3, 4 5 stator and winding b of rotor, asynchronous motor 2 has windings 7 3, 9 of stator h winding 10 rotor, six | ; 11, 12, 13, 14, 15 ID olod wires are connected in series and form a ring 17, beginnings of stitches 3 and 7 of stators Bagatelles 1 and 2 are connected to the first phase of the reading network, beginnings of windings 4 and 8 of the stators of motors 1 and 2 are connected to the second The mains supply, the start windings 5 and 9 of the motor cooler 1 and 2 are connected to the third phase of the mains supply, the end of the stator winding of the motor 1 is connected to the common connection point of the current-conducting elements 11 and 16, the end of the stator winding 4 of the engine 1 is connected to the common connection point elements 14 and

15, the end of the stator winding 5 of the engine 1 is connected to a common connection point of the current-carrying elements 13 and 14, the end of the stator winding 8 of the engine 2 is connected to a common connection point of the current-carrying elements 11 and 12, the end of the stator winding 9 of the engine 2 is connected to a common point the connections of the conductive elements 15 and

16. Resistors, reactors, semistor can be used as conductive elements 11-16.

Twin-motor drive works as follows.

We will assume that the current-conducting elements 11-16 are resistors.

Under the action of the mains voltage, currents flow through the windings 3-5 and 7-9 of the stators of motors 1 and 2, and the current flowing through the phase winding of one motor flows through the conductive element and then goes through the stator winding of another phase of the other motor. For example, the current of phase A of the mains passes through the winding 3 of the stator of the motor 1, then it goes along two circuits: the first circuit is the resistor 11, the winding 8 of the stator of the phase B of the motor 2, the phase B of the mains; the second circuit is the resistor 16, the winding 9 of the stator of the phase C of the motor 2, the phase C of the supply network. Simultaneously current

Lz phase A of the mains passes through the winding 7 of the stator of the motor 2, then it goes along two goals: the first circuit is the resistor M, the winding is / phase stator of the motor 1,

Soza V mains; the second circuit is a resistor 13. winding 5 of the stator of the phase C of the engine 1, phase C of the supply network. As a result, the same currents flow through the stator windings of the first and second motors, which are exactly the moments of these lg. Motors.

Likewise, in this two-motor electric drive, the stators currents and the moments of the motors are equalized. by

For the stators of both motors, the same currents flow, which makes it possible to improve the operation of the mechanisms where the electric motors operate under a common load. In addition, the limitation of the current-limiting elements of harmful closing currents through the windings of the same motor is an additional advantage of the drive.

To reduce active energy losses, not resistors, but reactors can be used as conductive elements 11-16.

To reduce energy losses, conductive elements 11–160 may use seven-switches or each element may be made in the form of two opposite-connected thyristors.

Claims (3)

Invention Formula 51. Twin-engine electric drive, containing two three-phase asynchronous motors, the beginnings of the stator windings of which are connected to the terminals for connection to the three-phase mains, about one l and Due to the fact that in order to improve the accuracy of the alignment of the stator currents and torques of the motors, the end of the stator winding of one phase of each motor is connected to the end of the stator winding of another phase of the other motor through one conductive element and connected to the end of the stator winding of the third phase of the other motor through another conductive element, while conductive 0 elements by the number of windings of the stators of the motors are connected in series and form a ring network, 2. Power pop. 1, different from and in order to reduce 5 losses of active energy, conductive elements are made in the form of reactors. 3. The electric actuator according to claim 1, of which is, in order to reduce energy losses, each of the conductive elements is designed as a triac.