SU134747A1 - Method for automatic limiting drive acceleration using generator-motor system - Google Patents

Description

The known methods of automatically limiting drive acceleration through a generator-motor system are carried out using flexible negative feedback on the generator electromotive force.

The described method allows to reduce the size and increase the effectiveness of limiting the acceleration of the device. This is achieved by signaling said negative feedback on emf. The generator is summed with the signal of a positive positive feedback on the current of the core. The received signal is fed to the excitation winding of the generator.

FIG. shows a schematic diagram of the implementation of the described method; in fig. 2 is a circuit with flexible positive current feedback.

To obtain a signal proportional to the emf derivative. generator (e.), an additional winding is used, placed at the main poles of the generator (Fig. D).

Electromotive force induced in this winding

6.d - OO - J - K -.

where f is the magnetic flux of the generator; - the number of turns in the additional winding.

In the secondary winding of the current transformer GG (Fig. 2) is induced emf proportional to the current cor

Phgg ,. and (/ „g.)

V.P -: "; ...,

where Ш2ГТ - NUMBER of turns in the secondary winding of the current transformer / T; g J, resistance box.

d0 rfe

No. 1347472 Summation signal is proportional to

derivative emf engine if to -. Therefore, when

To a constant engine flow, it is proportional to acceleration:

L:., d (e, ij) deg. dn

 / 9f -, .-. t, L / a - ,.

ve3 00 ::. jy 3 V7 -

1de n - rotational speed (number of assemblies).

The electric motor force e is supplied to the input of the control system or in series with a driving signal, as shown in FIG. 1, or to a separate stabilizing winding of the amplifier U. Due to the significant magnitude of the magnetic flux of the generator F, the emf is required. in „,) can be obtained with small dimensions of the winding Wo (,. For generality, the generator in Fig. 1 is shown with multiwinding.

When using generators of a single series, it is possible to replace the compounding winding, which in generator-motor systems (GD), as a rule, is not used by the additional winding with the corresponding parameters.

The application of the described method can be an effective means of limiting accelerations in a generator-motor system, for example, in an electric drive of high-speed elevators. In addition, this method provides a more powerful feedback signal, which allows it to be used in the system. With a low overall system gain, in particular, in circuits with low-power magnetic amplifiers, used directly to control the generator field, as well as for stabilizing asynchronous drive systems controlled by saturation throttles in the presence of an intermediate amplifier. In this additional winding should be placed ana. Optically windings of power chokes in bulk.

Subject invention

A method for automatically limiting drive acceleration in a generator-motor system, implemented using flexible negative feedback on emf. generator, characterized in that. that, in order to reduce the size of the device and increase the effectiveness of the acceleration limitation, the signal from this feedback on emf. The generator is summed with the signal of a positive positive feedback on the current of the core and, after summation, is applied to the excitation winding of the generator.

di dt /

O-LLDgo

FIG. 2