SU1640092A1 - Separate double-zone controlled electric drive for underground mining installation - Google Patents

Description

The invention relates to electrical engineering, in particular, to automatic control systems for electric drives (DC) of direct current installations of the type of mine hoists, and can be used in automation systems

figure 1

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mine hoist installations. The circuit of the invention is an increase in the accuracy and reliability of the EP. It contains an anchor ^— 1 electric motor (ED) of direct current and independent dependent excitation, reversible converter 2, sensors 3, 4 and 17 of current, voltage and EMF 16 EMF regulator, speed setting unit 10, intensity setting unit 14, consisting of] d proportional amplifier 11 with limiter 12 and integrating amplifier 13, non-reversible converter 20, ED excitation winding 18, sensor 19, excitation current regulator 24, block 23 module assignment, agree control amplifier 21 and restrictive ^ Tel assignment device 22. In block 27 entered mode, the threshold element 28, an amplifier 15 with a limited output signal, the brake control unit 34 and the current setting unit 25 with the respective interconnections. The device allows the release and breaking of the vessel with an increased excitation flow of 5-10X and at the same time reduce the armature current and improve the composition. In transient modes, an electronic signature ensures the correspondence between the specified and actual speeds of ED rotation, which is why the speed regulation error does not accumulate.

2 Il.

The invention relates to electrical engineering, in particular, to automatic control systems for direct current electric drives for installations of the type of mine hoists, and can be used in automation systems for mine hoisting installations.

The purpose of the invention is to improve the accuracy and reliability of operation of the electric subaccident.

Figure 1 shows the functional diagram of the drive; Fig.2 is a functional block diagram of the mode setting.

Electric drive; The mine lifting installation with independent two-zone control contains a DC motor of independent excitation. Driving lifting vessels through the drum and hoisting ropes, the armature 1 of which (Fig. 1) is connected to the reversible power converter 2 through the sensor 3 of the armature current. The first sensor 4 voltage is connected to the armature 1 of the motor. Reversible power Converter 2 includes, for example, connected in series anchor 5 of the generator with excitation winding 6, reversible thyristor converter 7 and voltage regulator 8, to the feedback input of which is connected a second voltage sensor 9 connected to the generator anchor 5. In the $$ control circuit of the power converter 2, a speed reference unit 10 is connected in series, proportional to the amplifier 11 with the second limiter

12 and the integrating amplifier 13, covered by the feedback and forming the intensity master 14, which provides the task of accelerating the movement of the lifting vessels, as well as the amplifier 15 with output signal limitation and the regulator 16 EMF.

The EMF circuit of the electric motor is formed by a 16 EMF regulator and a sensor

17 EMF, which summarizes the bipolar signals from the outputs of the first sensor 4 of the armature voltage 1 of the electric motor and the sensor 3 of the armature current. Circuit EMF regulates the speed at a speed below the main, while ensuring compliance with the actual rotational speed of the motor and set, which is set by the output voltage of the intensity indicator 14. Winding

18 excitation of the electric motor is connected through the sensor 19 of the excitation current to the non-reversible (for example, thyristor) converter 20,

the control channel of which is consistently included matching amplifier 21 with the first limiter 2? in the feedback, the module allocation module 23, which is a diode rectifier, and the excitation current controller 24, the feedback input of which is connected to the sensor output

19 excitation current.

The input of the controller 24 of the excitation current receives three signals: the feedback signal on the excitation current, the signal on the change of the excitation current from the module 23 allocation module and

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the signal from the setting device 25 of the excitation current, the input of which is connected to the first output 26 of the mode setting unit 27, which ensures the setting of the nominal and amplified 5-10% of the excitation current.

The output of the sensor 3 of the armature current 1 of the electric motor is connected not only to the input of the 17 EMF sensor, but also through loro | θ circuit element 28 - to the input of the integrating amplifier 13 and to the third input 29 of the mode setting unit 27, the fourth input 30 of which is connected to the output of the unit 10 speed reference, the first 15 54 receive signals from the system

whose input is connected to the second output 31 of the mode setting unit 27, the third output 32 of which is connected to the control input of the threshold element 28, the fourth output. 33 - with the input of the brake control unit 34; the fifth input 35 - with the output of the block 34, having a mechanical connection with the armature of the electric motor 1, the sixth input 36 - with the output of the 17 EMF sensor. At 25, the first and second inputs, respectively, the block 27 receives signals paths and movements _and prohibition.

The mode setting unit 27 contains the first comparator 37 (FIG. 2), an output zo connected to the first element NOT 38, an element EXCLUSIVE OR 39 and the first element I 40, and the input to the input 30 of the mode setting unit 27, the input 29 of which is connected to the second comparator 41, the output of which is connected to the first input of the element AND 42, the second input of which is connected to the output of the first element AND 40, and the third input through the second element NOT 43 is connected to the input 35 of the mode setting unit 27, where the second input of the element 39 EXCLUSIVE is also connected OR and third key control input 44, the output of which is connected to the output 32 of the mode setting unit 27, the output 33 of which is connected through the amplifier 45 to the output of the short-circuit trigger 46, whose 5-input is connected to the output of the And 42 element, and the K-input to the output of the pulse shaper 47, the input which is connected to the output of the element OR 48, the first input of which is connected to the output of the second element AND 49, the first input of which is connected to the output of the first element 38 and the second input to the output of the third compardor 50, the input of which is connected to the input 36 of the mode setting unit 27 whose output is 26

50

55

connected to the output of the first key 51, the input of which is connected to the output of the element 39 EXCLUSIVE OR, and the output 31 of the mode setting unit 27 is connected to the output of the second key 52, whose input is connected to the first terminal 53, and the second terminal 54 is connected to the input of the first element And 40 and the input of the third element NOT 55, the output of which is connected to the second input of the element OR 47. Signals are received on the first terminal 53 as a function of path c. sensor arc (not shown), and on the second clementomatics (not shown) "Motion inhibit" (logical "3") and "Motion resolution" (logical "1").

The threshold element 28 has a characteristic, and 20:

Oh, with u ^ eg-28 u

and, = ι

I"

(U - Iuet <Ζ8) »° F ^and u Article 28 - and ,; 0, with and 1 ^ St-2.v 2

(and ₅ - υ ^ ,. _τΖ8 ), with u ^ _stg8 <and,

where LA _{ST 28} is the voltage of the set point of the threshold element, corresponding to the armature current in the mode of release; and „ _n ,, _o - the same, corresponding

armature current when changing control zones;

armature current

The drive operates as follows 35.

In the absence of a signal at the output of the speed reference unit 10 (set by the machinist or automation system, the zero speed level by setting 40 the selsync kompanodaparat to the zero position) the armature circuit is de-energized, therefore, at the outputs of the first and second comparators 37 and 41, a logical "0" signal and the third 45th comparator 50 is a logical "1".

On the second terminal 54 there is a logical "1" signal, i.e. permission to move, and the output of the second element And 49 - a logical signal "1", while the element OR 48 and the pulse shaper 47 ensure that the short-circuit trigger 46 is set to the zero state, which corresponds to the inhibited machine (i.e., at the output of 34 is a logical signal "0"), therefore a logical "O" at the outputs of the first and third keys 51 and 44, which ensures the setting of the threshold element 28, corresponding to

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the required level of the armature current during release, as well as setting the nominal field current from the generator 25 of the field current.

When a signal appears at the output of the speed reference unit 10, a logical "1" signal appears at the output of the first comparator 37, which causes logical "1" to appear at the output of the element 39 and the first switch 51 is turned on, while the output voltage of the setpoint 25 increases, and therefore , and the excitation flow of the engine (about 5 - 10%), and in addition, a logical "1" appears at the second input of the element 42. Simultaneously with the beginning of the growth of the excitation flow, the armature current begins to increase, when it reaches the brake current, the second computer is triggered Ator 41, while all three inputs of the And 42 signal are logical "1" signals, so a logical "1" appears at the 8th input, at the output of the short-circuit flip-flop 46 and at the input of the block 34, the machine disengages and, in addition, the current increases will stop and stabilize at the level of the bleed current due to the triggering of the threshold element 28. When the machine is disengaged, the Logical “1” signal appears at the input 35 of the mode setting unit 27, which enables the third key 44 to turn on, and the triggering set of the threshold element 28 increases to the level required When the armature current moves, and at the output of element 39, a logical "0" signal appears (since at its inputs logical signals are "1"),

The first switch 51 is turned off. At the same time, the excitation current begins to decrease to the nominal value with simultaneous moving of the lifting vessel in a given direction.

"Thus, the engine disinhibition occurs only after a moment has been created on its shaft, which corresponds to the nominal end load, which allows to exclude the vessel's return stroke, reducing the performance, besides, the disinhibition and starting of the vessel is carried out with an increased excitation flow of 5-10% , which allows to reduce the required armature current and improve switching (due to a decrease in voltage and ^ _st yes)> ^P P ^{And this} motor torque is nominal.

The disinhibited motor starts moving in accordance with the generated diagram at the output of the integrating amplifier 13 and the nominal excitation flow. Acceleration during acceleration is determined depending on the time constant of the integrating amplifier 13 and the limiting voltage of the second limiter 12. When operating at a speed below the nominal, the rotation speed of the electric motor is controlled by the 16 EMF regulator, the nominal excitation current set by the exciter current 25.

The reference signal at the input of the regulator 24 of the excitation current consists of a continuously positive current corresponding to the nominal flow of the excitations of the subtracted signal to the flow attenuation, the value of which is determined by the output voltage of the module extraction unit 23 depending on the required motor speed. When the motor reaches a speed equal to the nominal, the amplifier 15 is included in the limitation, which ensures the stabilization of the task at the output of the regulator 16, and therefore the emf of the electric motor itself, and a mismatch signal appears at the input of the matching amplifier 21, and therefore, at the output block 23 allocation module, which leads to a decrease in the flow of excitation and to increase the speed of the electric motor. The speed increase stops when the specified at the output of the integrating amplifier 13 and the actual speed of the electric motor.

Thus, when the motor is accelerated to a speed higher than the nominal one by 10–15%, which is set by the speed reference unit 10, the amplifier 15 prevents the signal from appearing to weaken the field until the EMF of the electric motor reaches its nominal value. When the lifting machine moves at a speed higher than the nominal, the rotational speed of the electric motor is controlled by changing its excitation flow.

For the transition

process when moving from the first zone

regulation to the second, i.e. from PE9

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anchoring voltage to the regulation of the excitation flow, it is necessary to ensure the constancy of the dynamic current. This is done by switching the integrating amplifier 13, when the threshold element 28 is triggered, to the armature current control mode, since the load moment is constant, then actually to the armature dynamic current control mode. Therefore, a signal is generated at the input of the matching amplifier 21, which provides for the attenuation of the excitation flow with a constant dynamic current. ”

The interaction of the amplifier 15, the matching and integrating amplifiers 21 and 13, as well as the threshold element 28 with the current sensor 3 provides in the 20 transition mode the correspondence between the set and actual speed of the electric motor, which does not lead to the accumulation of control error in speed and, in addition, 25 The closing of the dynamic current control loop does not allow current surges to occur in this mode, and, consequently, the productivity increases and the commutation of electrical machines improves. ”

At the approach of the vessel to the point of deceleration start, the first input of block 27 (terminal 53) receives a signal H, which turns on the key 52, when closing 35 of which a reduced speed command is provided. Therefore, the output voltage of the intensity setting device 14 begins to decrease, setting the brake acceleration (required deceleration) to the electric drive, while the states of the remaining logic elements of the mode setting unit 27 do not change. ”

When braking the motor 45 at a speed higher than the nominal, the amplifier 15 prevents the EMF from changing until the excitation flow of the electric motor reaches the nominal value. braking proceeds ^ana ~ 55 logical acceleration mode to the nominal speed. ”When the vessel approaches the exact stop level, the signal H comes again (the storey closes

exact stop switch). The electric motor stops and a brake is applied to the anchor 1, since the logical 3 signal is set at the output of the first comparator 37 and the first input of the element is set ^! And 49 is a logical "1", at the second its' input there is also a logical ”1” signal, since the signal for the EMF is zero (the electric motor is stopped), and a signal of logical “1” appears at the first input of the element OR 48, and therefore and at its output, which ensures the formation of a reset pulse at the K-input of K5-flip-flop 46, which sets the flip-flop 46 to the zero state and apply a brake, after which the electric drive is reset to its original state. - logical signal "0", arriving at the second terminal 54, for example, of the protection system or when the vessel approaches the end point of the path ”

The control circuit of the EMF controls the frequency of rotation of the electric motor, while the signal proportional to the EMF is allocated at the output of the sensor 17 EMF, and the reference signal of the movement tachogram is output at the output of intensity 14, From the output of the regulator 16, the EMF signal is fed to the input of the power converter 2, the output voltage which determines the speed of the electric motor in accordance with the movement tachogram.

Thus, the electric drive allows comparison with the prototype by eliminating inaccuracies in testing the master signal in various operating modes to reduce the lifting cycle time, i.e., to increase the productivity of the mine lifting installation, in addition, increasing the excitation current in the release mode allows it to improve !, switching braked motor and its reliability.

Claims (1)

Claim Electric lifting shaft installations with independent dual-zone control containing reversible converter, to the terminals of which parallel connected sensor voltage I 1640092 12 and an armature motor of an independent excitation and an armature current sensor connected in series, the output of the latter is connected to the first input of an EMF sensor, the second input of which is connected to the output of a voltage sensor, an EMF regulator, a speed reference unit, an intensity setting unit, a module extractor module, a matching amplifier The output of which is connected to its first input through a limiter is a non-reversible converter, the excitation winding of the electric motor and the sensor then are sequentially connected to the outputs of which ka excitation, the output of the latter is connected to the first input of the regulator of the excitation current, the output of which is connected to the control input of the irreversible converter, characterized in that, to improve accuracy and reliability, a mode setting unit, a threshold element, an amplifier with limited output signal are introduced into it, current setting unit and brake control unit, the first and second inputs of the mode setting block are the same-name drives of the electric drive, the third input The mode setting unit is connected to the first input of the intensity setting unit through a threshold element and with the output of the armature current sensor, the first output of the mode setting unit is connected to the second input of the field current controller through the setting unit, the second output through the speed setting unit to the second input of the intensity setting unit and the fourth input block setting mode, the third output - with the control input of the threshold element, and the fourth output through the control unit 7 5 brake - with the fifth input of the mode setting unit, to the sixth input of which the output of the EMF sensor and the first input of the EMF regulator are connected, the output of which is connected to the control input of the reversing converter, and the second The EMF regulator input is combined with the second input of the matching amplifier, and connected to the output of the amplifier with limited output signal, the input of which is connected to the output of the intensity setter and the third input of the matching amplifier, the output of which is connected to the third input of the excitation current regulator. 2