SU1647834A1 - D c drive - Google Patents

Abstract

This invention relates to electrical engineering, in particular to an automated direct current drive. The purpose of the invention is to increase efficiency. The device for controlling the direct current motor of sequential excitation comprises a valve bridge, in the diagonal of the direct current of which the choke 5, the main winding 6 and the sectioned excitation winding 7 are included. The weakening of the field of an electric motor is provided by circuits of two oppositely connected diodes 8 and 9 of two in series between the diodes 8 and 9, contacts 10 and 11 of the field weakening contactors. Efficiency improvement is provided by eliminating electrical energy losses during regulation. 1 il.

Description

UNION OF SOVIET

SOCIAL OF THE NATURAL

REPUBLIC ,,, SU <· "1647834 A1

STATE COMMITTEE ON INVENTIONS AND OPENINGS

PRI ΓΚΗΤ USSR

DESCRIPTION OF THE INVENTION

TO AUTHOR'S CERTIFICATE

(21) 4627101/07 (22) 12/27/88 (46) 07/05/91. Bull. No. 17 (71) All-Union Research, Design and Technological Institute of Electric Locomotive Engineering (72) N.L. Saenko (53) 621.316.718.5 (088.8) (56) USSR Copyright Certificate No. 505111, cl. H 02 P 5/16, 1972.

USSR copyright certificate No. 571868, cl. H 02 P 5/16, 1977.

(54) DC ELECTRIC DRIVE (57) The invention relates to electrical engineering, namely to an automated direct current electric drive. The purpose of the invention is improving efficiency. A device for controlling a dc motor of series excitation contains a valve bridge, in the diagonal of the dc current of which a choke 5 is included. Anchor winding 6 and a sectioned excitation winding 7. The weakening of the field of the electric motor is provided by circuits of counter-connected diodes 8 and 9 by two sequentially connected between the diodes 8 and 9 contacts 10 and 11 of the field weakening contactors. The increase in efficiency is ensured by eliminating the loss of electrical energy during regulation. 1 ill.

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1647834 A1

1647834 4

The invention relates to electrical engineering and can be used in an automated DC drive.

The purpose of the invention is improving efficiency, 5 The drawing shows a direct current electric drive.

The direct current electric drive contains a valve bridge (diodes 1-4) in the constant current diagonal of which are included in series choke 5, an armature winding 6 of the electric motor and a sectioned excitation winding 7 with intermediate leads. To the diagonal of the alternating current of the valve bridge connected to the alternating current source, a field attenuation circuit is connected from counter-connected diodes 8 and 9 with two contacts 10 and 11 of the field attenuation contactors connected in series between them. The number of field attenuation circuits is equal to the number of intermediate terminals of the field winding. The common connection points of the contacts 10 and 11 of the field weakening contactors are connected to the corresponding 25 intermediate terminals of the field winding 7.

The electric drive operates as follows.

When all contacts 10 and 11 of the field weakening contactors 30 are open, the current with a positive potential at point a of the bridge flows along the shoulder ad of the bridge, inductor 5, anchor winding 6, sections of the excitation winding 7 and shoulder be, and with positive potential at the point from the bridge - on the shoulder with. throttle 5, anchor winding 6, sections of the excitation winding 7 and shoulder ba. Get the full field. When the contacts 10 and 11 of the field weakening contactor of one field weakening circuit are closed, the corresponding section of the field winding 7 is switched off, thereby weakening the field of the electric motor. Thus, closing successively the contacts 10 and 11 of the field weakening circuits, reduce the field of the electric motor. Consequently, the regulation of the rotational speed of the electric motor is ensured by switching the contacts of the field weakening contactors. The increase in efficiency is achieved by eliminating the loss of electrical energy 15 when adjusting the frequency of rotation of the electric motor.

Claims (1)

Claim A direct current electric drive comprising a valve bridge, a diagonal 20 of which includes a series-connected inductor, an armature winding of an electric motor, and a sectional excitation winding with intermediate terminals; an attenuation circuit is connected to the alternating current diagonal of the valve bridge connected to an alternating current source. counter diodes with two consecutively connected between the contacts of the field weakening contactors, characterized in that, in order to increase the efficiency, the number The number of field attenuation circuits is equal to the number of intermediate terminals of the field winding, while the common connection points of the contacts of the field weakening contactors are connected to the corresponding intermediate terminals of the field winding.