SU99411A2 - Device for automatically starting the DC motor - Google Patents

Description

Basically auth. St. And 78404 a device for automatic start of a direct current motor, consisting of start-up contactors and} 1 / h of one-touch relays, made according to the type of balancer 1x re., Holding KaTyin.Kjf, which are connected in parallel to the starting resistance sections react to the value of TOKR engine load. In order to realize the automatic dependence of R not only on the current, oo and on the engine speed, the workers of the coil and the balapsky relays are switched on in parallel and react to it, e. (rotation speed).

A feature of the proposed device is a) P1ego a modification of the device according osioviomu copyright evidetelstvZ l ete fact that it instead of two winding balanced relay actuated by them odnoobmotochnyh iusko13YH contactors applied dvuhobmotochpye balanced starting contactors connected with their windings to the armature of the engine and to trigger soprot This ensures that the co-ordination of equipment in the device is reduced.

The drawing shows a schematic diagram of the proposed device, providing a two-stage engine start.

To koryu engine D a constant 1P1Ogo current with a nara - (direct excitation) and to the starting resistance of the PS, the working voltage K, respectively, retarding Yes the windings of the balanced starting contactor with normally open contacts K.

In: umept vk; engine night counter-e. d. a rappa core, and a voltage drop across the starting impedance of the PS to the mains voltage. As the engine accelerates counter-e. d. the tension on the pa6o4eii winding Ki of the contactor, equal to counter-e, also increases and, consequently, increases. d c. The voltage held on the winding of the contactor K-2, proportional to the current of the core, decreases.

In a certain relationship between these voltages, the contactor is activated and with a tact K closes the starting resistance of the PS.

In the case of a multi-stage motor start-up, similarly to the described one, balanced contactors operate that control the cooTBeTCtBjroH, HMH stages of the starting resistance.

Subject invention

Modification of the device for automatic start of the DC motor according to the author. St.

78404 by closing the starting resistances depending on the ratio between e. d. and motor current, characterized in that, in order to reduce the number of apparatus} in the circuit, instead of double-wound balanced relays and single-winding starting contactors controlled by them, double-wound balanced starting contactors connected by their windings to the motor core and to the starting resistances are used.