SU1453576A1 - Frequency-controlled electric drive - Google Patents

Abstract

The invention relates to electrical engineering and can be used in turntables, in machine tools with numerical control. The aim of the invention is to improve the accuracy of torque control of an asynchronous electric motor by ensuring high speed and quality of the transient matching process of a given and true angular positions of the resultant stator current vector. For this, in the frequency-controlled electric drive, the phase error correction unit 9 is equipped with a coordinate converter 16, a controlled voltage generator 15, division blocks 18 and 19, a module allocation block 17, multiplication blocks 20-24, multipliers 29-28, a converter 29 ( About ate 00 ate k |

Description

arcsine functions and a relay element. The input node 9, formed by the input of the coordinate converter, is connected to the outputs of the sensors 2 phase currents of an asynchronous motor. The input of the node 9, formed by the input of the generator 15, is connected to the output of the phase setting of the driver 12 of the amplitude and phase setting. The output of node 9, formed by the output of relay block 30, is connected to one input of adder 7, the other input of which is connected to frequency setting unit 8, and the output to the input of control unit 6 by an independent inverter 3 tOKa connected via a current sensor 14 and throttle 4 with a controlled plug 5. To the output of the inverter 3 is connected the stator winding of the induction motor 1. The inputs of current regulator 13 are connected to the output of current sensor 14 and the code for setting the current amplitude of the stator of the transformer 12, to the inputs of which signals from setting points 10 and II are received of active and reactive components of stator current. 1 il.

one

The invention relates to electrical engineering, in particular, to an automated electric drive, and can be used in precision following electric drives of turntables, machine tools with CRT / and other: mechanisms with increased requirements for control accuracy and tracking.

Viy.

The purpose of the invention is to improve the accuracy of control of the torque of the asynchronous engine by ensuring high speed and quality of the transient matching process. set and true angular positions of the resultant current vector of the stator.

The drawing shows the functional diagram of the frequency-controlled electric drive.

The frequency-controlled electric drive contains an asynchronous motor 1, the stator windings of which are. A sensor of 2 phase currents is connected to the outputs of an autonomous inverter 3 whose current input through a choke 4 is connected to the output of a controlled high voltage switch 5, block 6 controls an autonomous inverter 3 current connected by an input to the output of an adder 7, one of the inputs of which is connected to the output frequency setting unit 8, and another input is connected to the output of the phase error correction section 9, the generator 10 of the active component of the stator current

and the generator 11 of the reactive component of the stator current connected by outputs to the corresponding inputs of the shaper 12 sets the amplitude and phase of the stator current, current regulator 13 connected by one input to the output of the amplitude of the specified shaper 12, and the other input to the output of current sensor 14 set at the output of the controlled output of the miter 5. At the same time, the output of the sensor 2 of the phase currents and the output of the phase setting of the shaper 12 of the amplitude and phase current of the stator are connected respectively to the second and first node 9 of the correction of the phase error.

In the frequency-controlled electric drive, the phase error correction node 9 is equipped with a generator 15 controlled voltages, a coordinate converter 16, a slot 17, a module, division blocks 18 and 19, multiplication blocks 20-24, adders 25-28, a converter 29 arcsine function and relay element 30.

The input of the generator 15 of controlled voltages and the input of the coordinate converter 16 form the first and second inputs of the phase error correction section 9, respectively. The first and second outputs of the coordinate converter 16 are connected respectively to the inputs of the divisible first and second blocks 18 and 19 of the division and to the inputs

block 17 in the module section, the output of which is connected to the inputs of the divider units 18 and 19 division. The output of dividing unit 18 is connected to the first inputs of the first and second multiplication units 20 and 21, the second inputs of which are connected respectively to the first and second outputs of the generator 15 of controlled voltages.

The outputs of the first and third blocks 20 and 22 of the multiplication are connected to the inputs of the second adder 26. The output of block 1B through the transistor 29 of the arc sine function is connected to one of the inputs of the first adder 25, the other input of which is connected to the first input of the phase error correction unit 9. The outputs of the adders 25 and 26 sotsii phase error. The inputs of the latter receives signals 0 and units of output from the shaper 12 and from the output of the sensor 2 phase currents. The generator 15 of controlled voltages on the signal 0, forms the harmonic functions sin b and cos b at the outputs.

Coordinate transducer 16 10 signals 1vl, bc Generates an Ig module and makes up a kilometer Ig and Ig of the real stator current, according to the values of which on the outputs of the I8 and I9 division blocks, signals are generated

15

cos Q:

i5.i.

IT -9: -Tf .шr ,. „. the sum of rupuB j and -io cQ- Blocks 21 and 23 multiplication and sum-are united with the inputs of the n block 24 24 -20 form the input of the adder

KNIVES. The outputs of the second and fourth quarter tt nanui.

Multiplication blocks 21 and 23 are connected to the inputs of the third adder 27. The outputs of multiplication unit 24 and the third adder 27 are connected to the inputs of the fourth adder 28, the output of which is connected to the input of the relay element 30, the output of which forms the output of the phase error correction unit 9.

The frequency-controlled electric drive operates as follows.

Active 10 and Reagent25

thirty

The 11 components of the stator current form the reference signals I and 1 in the Cartesian coordinate system associated with the rotor flux vector. In shaper 12, these signals are converted to a polar coordinate system, and at its outputs, the signals for setting module I and phase 0 are received. The stator current vector relates the signal U, equal to

and, - sin0, .cos 0; - cosd- - sinP; sinOt -b; ),

where 0 and 0; - given and true value of the angular position of the resulting vector current of the stator it.

Blocks 20, 22, and 24 multiplications, adder 25, transducer 29, and CJTM-matrix form a signal U2 at the input of adder 28 according to the expression

35 Uj "(sin0f. Sin0; + cos0;)

“(9, - arcein (8in9)) - () cos (0;).

Thus, the first and second inputs of the adder 28 are given the signals and, and Uj, which are sine.

relative to the rotor flux vector.

Thus, the first and second inputs of the adder 28 are given the signals and, and Uj, which are sine.

the topic of automatic regulation by means of current regulator 13.

Control pulses on the auto-angle keys of the phase error given 0 and true 6; the values of the angular polo. The reference signal 1 of the current modulus of the resulting vector of the torus current is processed in a closed-loop stator and its derivative. Wherein

The relay element 30 operates in a sliding mode with a high switching frequency. At the output of the relay power inverter 3, current is generated, which means that at the output of the node, at the outputs of the phase inversion control unit 6, the phase error is obtained by a torus, and the frequency of the control signals is proportional to the signal 9 at the output of the adder 7 ,. which is obtained by summing the frequency reference signal.9, a post) where K is the output from the output of the frequency setting unit 8, and a correction signal 0k, which is output from the output of the corrector node 9

BC KMAKS (- 9;) - - K (9;) cos (0 - 9;),

- the scale factor of the second input of the adder 28i Kmais maximum signal correction phase error,

1453576

phase error. The inputs of the latter receive signals 0 and units of output of the driver 12 and from the output of the sensor 2 phase currents. The generator 15 of controlled voltages on the signal 0, forms the harmonic functions sin b and cos b at the outputs.

Coordinate transducer 16 by signals of 1vl, BC Forms an Ig module and constitutes km3 Ig and Ig of the real stator current, according to the values of which, at the outputs of blocks I8 and I9 dividing, signals are generated

15

cos Q:

i5.i.

IT

Blocks 21 and 23 multiply and sum-20 form the input of the adder

gig tt nanui.

25

0

28 signal U, equal to

and, - sin0, .cos 0; - cosd- - sinP; sinOt -b; ),

where 0 and 0; - given and true values of the angular position of the resultant vector current of the stator, i.

Blocks 20, 22, and 24 multiplications, adder 25, transducer 29, and CJTM-matrix form a signal U2 at the input of adder 28 according to the expression

5 Uj "(sin0f. Sin0; + cos0;)

“(9, - arcein (8in9)) - () cos (0;).

Thus, the first and second inputs of the adder 28 are given the signals and, and Uj, which are sine.

the angle of the phase error given 0 and true 6; values of the angular polar 5 resultant vector of the stator current and its derivative. Wherein

   means and at the output of the node phase error correction receive a signal de K

BC KMAKS (- 9;) - - K (9;) cos (0 - 9;),

- the scale factor of the second input of the adder 28i Kmais maximum signal correction phase error,

The output of the adder 7 is formed by the input signal of the control unit 6 current inverter, equal to

6 - Ql ± Q

y )

Where

e.

correction signal phase error set and the true values of the angular position of the resultant. stator current vector. Thus, the proposed implementation of the phase error correction node provides, in comparison with the known, involving discrete phase error measurement, a higher accuracy of motor torque control due to the high speed and quality of the transient matching of the set current of the stator current.

Claims (1)

Invention Formula A frequency-controlled electric drive containing an asynchronous motor, the stator windings of which are connected via the sensor of phase currents to the outputs of an autonomous current inverter whose input through a choke is connected to an output controlled by an external current inverter connected to the output of an adder one of the inputs of which is connected to the output of the frequency setting block, and the other input is connected to the output of the phase error correction node, setting the active and reactive components of the stator current connected outputs Wires to the corresponding inputs of the driver for setting the amplitude and phase of the stator current, a current controller connected by one input to the code for setting the amplitude of the specified driver, and another input to the output of the current setting device installed at the output of the controlled rectifier, while the sensors of the phase sensor currents and the output of the phase setting of the amplitude and phase generator of the stator current are connected to the second and first inputs of the phase error correction node, respectively, so that THAT ;, in order to improve the accuracy of torque control asynchronous motor by obes 4535766 liver of high speed and quality of the transition process of matching the set and true angular positions of the resultant stator current vector, the phase error correction node is equipped with a generator of controlled voltages, a coordinate converter, a lazy module lazy module, the first and second division blocks, the first, second, third, fourth and fifth multiplication blocks, the first, second, third, and fourth adders, 15, the arcsine function and the relay element, while the input of the generator of controlled voltages and the input of the coordinate converter form the first and second inputs of the phase error correction center, respectively, the first and second outputs of the coordinate converter are connected respectively to the inputs of the first and second dividers and with input block 25 of the module, the output of which is connected to the inputs of the divider of the first and second division blocks, the output of the first division block is connected to the first inputs of the first and second multiplication blocks, the second inputs of which are connected respectively to the first and second outputs of the generator of controlled voltages, the output of the second block the division is connected to the first input of the third and fourth multiplication blocks, the second inputs of which are connected respectively to the second and first outputs of the generator of controlled voltages, the outputs of the first and 40 of the third multiplication unit is connected to the inputs of the second adder, the output of the first division unit is connected via an converter of the arcsine function to one of the inputs of the first adder, 45 whose other input is connected to the first input of the phase error correction node, the outputs of the first and second adders are connected to the inputs of the fifth multiplication unit, the outputs of the second and fourth multiplicators are connected to the inputs of the third adder, the outputs of the fifth multiplication unit and the third adder are connected to the inputs the fourth adder, the output of which is connected to the input of the relay element, the output of which forms the output of the phase error correction node.