SU1603519A1 - Asynchronous-thyratron cascade - Google Patents

Abstract

The invention relates to electrical engineering and can be used in automated electric drives of pumping, compressor and hoisting-and-transport mechanisms. The aim of the invention is to improve the energy performance. In the asynchronous valve cascade, a thyristor voltage regulator 2 is inserted, supplying the stator winding of synchronous motors 1 with a phase rotor, two nonlinear units 10 and 12, an adder 14, a flow sensor 13, a torque sensor 9 and an inverter counter-electromotive sensor 11. The outputs of sensors 9 and 11 are connected respectively to the inputs of nonlinear blocks 10 and 12, the outputs of which and the output of sensor 13 of the flow are connected by the inputs of the adder 14, the output connected to the unit 3 controlling the thyristor voltage regulator 2. The cascade provides high energy performance in any control range and various moments of load on the induction motor shaft when operating according to a predetermined control law, for example, the minimum stator current, minimum total loss, minimum power consumption, maximum efficiency or energy index. 3 il.

Description

The invention relates to electrical engineering and can be used in electric drives of industrial installations, for example, pumping, compressor, low and. hoisting and transport mechanism

The purpose of the invention is to improve the energy performance.

Fig, 1 shows a block diagram d of the asynchronous valve cascade; 2 and 3 7- dependencies implemented by non-linear blocks.

The asynchronous valve cascade contains an asynchronous motor 1 with a phase rotor, the stator winding of which is connected to the thyristor controller 2 of the voltage controlled by the control unit 3. The rotor winding of the induction motor is connected to the input of rectifier-inverter bioc 4, made up of an uncontrollable bridge rectifier 5, throttle b and inverter 7 connected in series with the control unit 8 25, the outputs of the inverter 7 are provided with terminals for connecting to the network,

In the asynchronous valve cascade, a sensor of 9 moments nonlinear jg block 10 is inserted; peaJ: izyh functional function

Dt de + g, sensor 11 of counter-electromotive force 5 Nonlinear block 125 realizing the function of the type C), sensor 13 of flow and three-input adder 35 14. Sensors 9 and 13 are mechanical-. 1SH is connected to an asynchronous motor, and sensor 11 is connected in parallel to the input of the inverter 7, Sensor outputs 9 and 11 are connected to the inputs of nonlinear 40 OUCH blocks 10 and 12 The inputs of adder 14 are connected to the outputs of sensors of nonlinear blocks 10 and 12 and sensor 13, SU Matora 14 is connected to the input of control unit 3 of thyristor 45 by controller 2, whose input is connected to the mains

Asynchronous valve cascade works as follows.

When the control signals are received from the control unit 3, the supply voltage is applied to the thyristor controller 2 on the stator winding of the asynchronous motor. The regulation of the frequency of rotation of the motor 55 occurs by introducing into the rotor winding the counter electromotive force of the inverter 7 according to the signal from the control unit 8.

The inverter’s counter-emf signal 5, taken from sensor 11, is fed to a nonlinear unit 12, where an optimum flow signal sr is formed corresponding to the nominal load on the shaft of an asynchronous motor 1. A signal and a load moment of the asynchronous motor 1 are taken from the moment sensor 9 where the moment signal of the mandrel is generated. The adder 14 compares the signals cp ,, and O / I of the downstream signal existing in the gap of the asynchronous motor 1. The output of the adder produces the signal S (opt + Od, -C, acting on the control unit 3 of the tyrrytor voltage regulator 2 and voltage at the output of the regulator 2 changes until the signal O reaches zero (o 0), which corresponds to the optimal value of the flow cp in the gap of the asynchronous motor 1 taking into account the real load on the shaft, i.e. (((- +

 ; °

In the electric drive, it is possible to provide with the help of a nonlinear block 12 various control laws, in particular, 2 according to the minimum current imiriCTa-- torus (Fig. 2) 5, the minimum total losses UPg mj, the minimum power consumption, P ,, n,; |, and the maximum energy index f -cosU) „,,.. In o6nteM case on nonl. I inCiA

In block 12, the dependence is established between the relative value of the added counter-electromotive force of the inverter and the relative value Sopt of the optimum motor flow in the Bi-sch p -, -

 a + c, where as b, c are constant values

with , . Е; i С -) Ðр

where Е I, - Inverter's counter electromotive force;

Е р - engine EMF at a retarded rotor.

Similarly, using the nonlinear unit 10, according to the indicated laws, it is possible to provide an interrelation between the relative magnitude and moment of the engine and the wind drive of the jii torque correction (phYoZ), which can be represented in the full version 0 ,, de -f g. where d, .f, g are constant values.

The op mule of the invention. An asynchronous valve cascade, containing an asynchronous motor with a phase rotor, to the winding of the rotor of which is connected the input of a rectifier-inverter unit, the output of which is provided with clips for connection to the network, and the control input of the rectifier a multi-inverter unit is connected to the output of the control unit, the thyristor voltage regulator with the control unit,

An asynchronous motor torus, characterized in that, in order to improve energy performance, flow and torque sensors mechanically connected to the induction motor, a counter-EMF sensor connected in parallel with the inverter, a three-input adder and two non-linear units, one of which implements the function, are introduced into it. del + g, and the other, point a + c, the entrance of the first body;

The key is connected to the code of the torque sensor, and the input of the second nonlinear block is connected to the output of the counter electromotive force sensor, the outputs of the nonlinear blocks and the flow sensor are connected to the corresponding inputs of the adder, the output connected to the input of the thyristor rc control unit

F,

hum torah, and - carry Phnom

v. „„ .. V,. yupctb-optimal optimal flow asynchronously connected to the winding circuit of the sta- tion ° ° ° C1pt Pnom optimum and nominal flows of the asynchronous motor; -

la inverter electromotive force; E - inverter electromotive force; Ep - EMF of the motor rotor when the rotor is braked; 20 M

- relative moment asynomial

chronic engine; M - engine torque; MHOM moment of movement.

of the indicated non-linear blocks are under- - 25 magnitudes.

B, c, d, f, g constant

The key is connected to the code of the torque sensor, and the input of the second nonlinear block is connected to the output of the counter electromotive force sensor, the outputs of the nonlinear blocks and the flow sensor are connected to the corresponding inputs of the adder, the output connected to the input of the thyristor rc control unit

F,

hum torah, and - carry Phnom

 tel;

engine ratio; -

la inverter electromotive force; E - inverter electromotive force; Ep - EMF of the motor rotor when the rotor is braked; 20 M

- relative moment asynomial

chronic engine; M - engine torque; MHOM nominal torque dvig25 magnitude.

B, c, d, f, g constant

mas

0.1

.

0.1

0.3 0, it 0.5 Fi.2

Gsh- /;

mat

 mtn

US

Compiled by AoGolovchenko

Editor LLcholinskaya Tehred M. Dvdyk; Proofreader T. Kolb

Order 3393

Circulation 456

V1ISH1I of the State Committee for Inventions and Discoveries at the State Committee of Science of the USSR 113035S Moscow, Zh-35, 4/5 Raushsk Nab.

Proizodzstsenno-publishing plant Patent, Uzhgorod, st. Gagarin, 101

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Claims (1)

SUMMARY OF THE INVENTION An asynchronous-valve cascade comprising an asynchronous motor with a phase rotor, the rotor winding of which is connected to the input of the rectifier-inverter unit, the output of which is provided with clamps for connecting to the network, and the control input of the rectifier-inverter block is connected to the output of the control unit, a thyristor voltage regulator with a control unit included in the stator winding circuit of an asynchronous motor, characterized in that, in order to improve energy performance, flow sensors and moment mechanically coupled to an asynchronous motor, a counter-emf sensor connected in parallel to the inverter, a three-input adder and two non-linear blocks, one of which implements the function S ^ .de ^ + g, and the other Funkttp = aE + s, the input of the first of these non-linear blocks is connected to the output of the moment sensor ', and the input of the second nonlinear block to the output of the counter-emf sensor, the outputs of non-5 linear blocks and the flow sensor are connected to the corresponding inputs of the adder, the output connected to the input of the thyristor re-ή φ _ο control unit Гуля of the facilitator, and = - ⁿ - - relate- | V Nominal Optimum Asynchronous Stream. motor; Р _OPT , <Р _МОМ - optimal and nominal flows of the asynchronous motor; £ = is the relative ^{ratio E} |> . anti-EMF inverter; EC - counter-EMF of the inverter; Ep - EMF of the rotor of the engine with a braked rotor; 20 _ M Μ - τ; --- is the relative moment of asyn. ^{1 m} nom 'chronic engine; M - engine torque; Mts _ohm - rated torque dviga-. body; a, b, c, d, f, g are constants. 25 quantities. '' Fi g