SU565367A1 - Direct current series-wound motor control device - Google Patents

Description

one

P1zobreteniye can be used in the traction electric drive.

The devices 1,2 are known for pulse regulation; neither the motor is sequentially energized and contains a main thyristor, a commutating thyristor and a KOI detector, a spawning drive, a thyristor and a choke, gates, windings, excitation n and cor.

In these devices. X: when the winding current decreases, the excitation windings are carried out accordingly, which leads to a sharp increase in engine speed and a small moment to its shaft. In order to increase the rigidity of the mechanical characteristics of a series excitation motor, voltage regulation on the core winding is used, for which current feedbacks are applied to the control system, np pappen, or direct current control, the excitation winding, is used, which means complicates the device.

The aim of the invention is to determine the accuracy of control by ensuring the regulation of the excitation current of the high current cor.

This is achieved by the fact that in the proposed device the field winding is connected in series with the recharging thyristor

And choke. This leads to an increase in the current of the excitation winding and at the burning currents of the winding of the core.

FIG. 1 and 2 show the scheme of the proposed device (two modifications).

Parallel to the main thyristor 1 are connected switching thyristor 2 and capacitor 3, and parallel to capacitor 3. recharge thyristor 4 and reactor 5 are connected. Field windings 6 and core 7 of the shunt motor are connected via valves 8 and 9, the motor receives power through the regulator from the power supply network 10.

The device works in the following way.

When the engine is in motion, it is necessary to open thyristor 2, as a result of which the condisator 3, in connection with pepirc - thyristor 2, capacitor 3, and measles 7 - is charged before applying voltage AND to the supply network 10. Then it is necessary to open the thyristor 4 and as a result of recharging circuit - capacitor 3. reactor. p 5, thyristor 4, excitation winding 6, capacitor 3 - the current in the winding 6 reaches

values equal to U 1 /

 6 vA "

where Cz is the capacitance of the capacitor 3,

LS - reactor inductance 5, - winding inductance 6.

After termination of the flow of current tok, according to the decree, another field current will flow along the circuit - field winding 6, valve 8, field winding 6. The thyristor 2 must be opened again, then the thyristor 4 will be opened. go to U, and each time the thyristor 4 is unlocked, then recharging and moving the controller will first flow to the circuit - capacitor 3, reactor 5, thyristor 4, valve 8, co-capacitor 3, when the current in the circuit reaches winding current 6, valve 8 will be close up and TO.C. overcharging will flow to the circuit - capacitor 3, reactor 5, thyristor 4, field winding 6, capacitor 3, increasing 1 increase in winding current 6. When current reaches 1 maximum and the maximum value opens valve 8 and recharge current Let it flow in a contour 3-5-4-8-3. As a result, in turn, the thyroidors 2 and 4 of the current in the winding 6 will reach values and 1 / and subsequently will remain unchanged, since during each commutation the energy losses in the excitation winding will be replaced by a capacitor.

It is advisable to unlock the main thyristor 1 only after the current in the winding 6 reaches a steady-state value, since at the beginning of the process the switching capacitor 3 gives 31 a significant part of the energy to the winding 6 and the loading of the thyristor 2 below it by unlocking the U. in the device of FIG. 1, the current in the excitation winding does not depend on a crust core, which may be less or more than the excitation current.

In the device by fiig. 2, operating similarly to the device, but FIG. 1, the current in the excitation winding does not depend on the current of the core only when the current is. cor is less excitation current. When the current exceeds the core value

and / - the current in the field winding is equal to

ku

Claims (2)

1. The patent of Germany No. 1638092, cl. 21 from 59/10,.: 2. Japanese Patent No. 20302, cl. 55c, 210.3, 1969. ID 0- - "