SU1594464A1 - Apparatus for measuring module and guiding cosine of vector of magnetic-flux linkage in a.c.generators - Google Patents

Abstract

The invention relates to drive control and can be used in AC vector control systems for generating signals proportional to the main flow coupling module and the cosine guides of the coordinate system with the main flow coupling reference vector. The aim of the invention is to improve the measurement accuracy. The device contains Hall sensors 1 and 2, calculator 3 modules, multiplication blocks 4 and 5, controller 6, first aperiodic amplifier 7, third and fourth multiplication blocks 8 and 9, integrating amplifiers 10 and 11, fifth and sixth blocks 12 and 13 multiplication, calculator 14 squared modulator, controller 15, absolute value calculator 16, seventh multiplication block 17, operational amplifiers 19 and 19, output buses 20-22, frequency control bus 23, amplitude setting bus 24, bias voltage bus 25, eighth and the ninth blocks 27 and 28 multiply, the frequency setting bus 28, the total s 29-31. 1 il.

Description

The invention relates to the field of electric drive control and can be used in AC vector control systems for generating signals proportional to the main flow module and the coordinate cosines of the coordinate system with the reference vector of the main flow chain.

The aim of the invention is to improve the measurement accuracy.

The drawing shows a diagram of a device for measuring the modulus and the cosine guides of the main flux vector in AC machines.

The device contains Hall sensors 1 and 2, calculator 3 modules, 4 and second 5 multiplication blocks, controller 6, first aperiodic amplifier 7, third 8 and fourth 9 multiplication blocks, integrating amplifiers 10 and 11, fifth of 12 and sixth 13 multiplication units, calculator 14 squared module, proportional-integral (GOT) controller 15, absolute value calculator 16, seventh multiplication unit 17, operational amplifiers 18 and 19, first 20, second 21 and third 22 output buses, bus 23 frequency control, amplitude setting bus 24, bias voltage bus 25, Eighth 26th and Ninth 27 blocks of multiplications, 28 times a day

toty, the first 29 and second 30 and third 31 adders.

The outputs of Hall sensors 1 and 2 are connected to the inputs of the first 18 and second 19 operational amplifiers, the outputs of which are connected to the inputs of the calculator 3 module, the output of the latter is connected to the first output bus 20, and the inputs to the first inputs of the first 4 and second 5 multiplication blocks, the outputs of which are connected to the first and second inputs of the first aperiodic amplifier 7 and controller 6. The output of the latter is connected to the input of the aperiodic amplifier 7, the output of which is connected to the second inputs of the third 8 and fourth 9 multiplications and to the bus 23 is regulated neither the frequencies, the outputs of the third 8 and the fourth 9 multiplication blocks are connected to the first inputs of the first 29 and second 30 totalizers respectively, the outputs of the last are connected to the first inputs of the first 10, respectively.

d

five

5 Q

0

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0

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and the second 11 integrating amplifiers, the outputs of which are connected to the second 21 and third 22 output buses, respectively, are connected to the first, fourth inputs of the fourth 9 and third 8 multiplication units, respectively, with the second inputs of the second 5 and first 4 multiplication units, with the first inputs, respectively an additional l2 and sixth 13 multiplication blocks and with the inputs of the calculator 14 square modules, the output connected to the first input of the PI controller 15.

The second input of the controller 15 is connected to the setpoint bus 24, amplitudes, the first input of the absolute value calculator 16 is connected to the second inputs of the third 8 and fourth 9 multiplicators, the second input is connected to the bias 25 pzhny, and the output is connected to the first input of the seventh block 17 multiplication, the second input of which is connected to the output of the proportional-integral controller 15, and the output is connected to the second inputs of the fifth 12 and sixth 13 multiplication blocks, the outputs of which are connected respectively to the second. the inputs of the first 29 and second 30 adders, the outputs of which are connected to the first inputs of the eighth 26 and ninth 27 multiplication units, respectively, the second inputs of which are connected respectively to the third 22 and second 21 output buses, and the outputs are connected to the inputs of the third adder 31, the output of which is connected with the auxiliary input of the regulator 6, the third auxiliary input of the first aperiodic amplifier 7 is connected to the frequency reference bus 28.

The device works as follows.

The rotating field of the electric machine induces in the Hall sensors 1 and 2 EMF, having the main (first) harmonics 1d (n / (1 / ь, shifted by 1i l2 radians, the amplitudes of which are proportional to the magnitude of the magnetic flux of the machine. These signals containing the highest harmonics are defined The technical realization of the machine and the variable frequency voltage source (for example, a frequency converter) 5 are fed to the inputs of multiplication blocks 4 and 5 and the calculator 3 modules. Multiplication blocks 4 and 5 multiply the input values sincff, cozy, with current values of c os t, sin if, the frequencies and phases of the signals at the outputs of the integrated amplifiers 10 and 11. (By virtue of the law of frequency, the main flow circuit is also controlled by the machine (q I is constant). The signal difference between multiplication blocks:

sin (f, .cos (cos i sin sin (()

R

(or COS if -sin if cos (fJ B depending on the order of phase rotation) is fed to the input of the controller 6, since signals that are proportional to the products are formed on the codes of the eighth 26th and ninth 27th multiplication units

   cos i /

and with sin Cf,.-sin if,

where cos tf cos (J co (t) dt);

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sinLp sin (| cxj (t) dt), TO the output of the tg of its adder is a signal ...

cd (cos cfl-cos q + sin if sincf)

 f (J) dt- Jw (t) dt) a.

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The difference signal oJ through the regulator 6 and the first aperiodic amplifier 7 hits the inputs of the third, 8th and fourth 9 multiplicators. 40 rational frequency reference bus 23

The signal from the aperiodic amplifier 7 to the frequency control bus 23 determines, by its absolute value, the gain in the circuit formed by multiplying unit 8, integrating amplifier 10, multiplying unit 9 and integrated amplifier 11, and the frequency of oscillations generated, and the polarity of the signal frequency control bus 23 determines the phase sequence of a two-phase output signal system. The signals from the integrating amplifiers 10 and 11 are fed to the inputs of the calculator 14 square module, and from its output to the input of the Sh1-regulator 15, adjusted to the desired quality of stabilization of the level of oscillation amplitude specified by the signal fed to the second input of the PI-controller 15 from the bus 24 set amplitudes.

The amplitude error signal from the output of the pi controller 15 is fed to 35 the first input of multiplication unit 17, the transmission coefficient of which is proportional to the signal from the output of the absolute value calculator 16, to one input of which the signal is transmitted

National set frequency bus 23

Whose amplifier 7 fixes the operating point on the static characteristic of frequency control and, consequently, controller 6 operates in the vicinity of this point (which is important, since sin Aif Cfc with error up to 0.5% when 17 is happy). (The result of these measures, including linearization, provides precise frequency tracking).

The signal from the aperiodic amplifier 7 to the frequency control bus 23 determines, by its absolute value, the gain in the circuit formed by multiplication unit 8, integrating amplifier 10, multiplication unit 9 and integrated amplifier 11, and the frequency of the oscillations generated and the signal polarity on the bus 23, the frequency control determines the phase sequence of the two-phase output system. The signals from the integrating amplifiers 10 and 11 are fed to the inputs of the calculator 14 square module, and from its output to the input of the Sh1-regulator 15, adjusted to the desired quality of stabilization of the level of oscillation amplitude specified by the signal fed to the second input of the PI-controller 15 from the bus 24 set amplitudes.

The amplitude error signal from the output of the pi controller 15 is fed to the first input of multiplication unit 17, the transfer coefficient of which is proportional to the signal from the output of the absolute value calculator 16, to one input of which a signal is given that is proportional to

In this case, the regulator 6 provides the required quality of phasing, and the first aperiodic amplifier 7 is involved in filtering higher harmonics and shaping the dynamics. In addition, using the first, second and third auxiliary inputs to the first aperiodic amplifier 7, a frequency control signal is sent to the frequency reference signal.

Due to the input to the input of the first aperiodic amplifier 7 of the reference signal ct), an advance in phasing is created. Advance feedback from the outputs of the first 4 and second 5 blocks multiplied by the first and second additional inputs of the first aperiodic-WiC bus 28

frequency control, and the other input is energized from the bias voltage bus. The voltage from the output of block 17 multiplies 5 to the second inputs of blocks 12 and 13 multiplication, which realize when they feed to the first inputs of voltages from the outputs of the integrating amplifiers 10 and 11 feedback coefficients. In this case, the sign of the feedback, regardless of the polarity of the signal on the frequency control pin, is determined by the sign of the amplitude error: if the specified amplitude is greater than the real one, the feedback is positive, otherwise it is negative, and if they are equal, the feedback coefficients connections are zero. The feedback coefficient is determined by

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7

not only an error in amplitude, but also an absolute value of a given input frequency, as a result of which the quality of the transient stabilization processes does not depend on the oscillation frequency and the order of phase alternation (polarity of the signal on the frequency control bus),

 The bias signal on the bus bias voltage provides the necessary 1) coefficient of stabilizing feedbacks at frequencies close to zero. As a result, the outputs of the interiming amplifiers 10 and 11 produce signals of stable amplitude, which are phase to the first harmonics of the input signal system (with strongly suppressed higher harmonics).

Dp ensure the unification of multiplier units for the coefficient of re- and 6CX

cottages (, 1

) and full use of their dynamic range, the signals from the outputs of Hall sensors 1 and 2 are fed to operational amplifiers 18 and 19. (their gain depends on the type of sensors), and from their outputs to the in-turn of the calculator 3 module and blocks 4 and 5 multiply.

Claims (1)

In addition, to ensure optimal operation of blocks 4 and 5 of multiplication and controller 6 in systems with a wide range of flow amplitude variations, it is possible to use division blocks, while the synos from the outputs of amplifiers 18 and 19 are fed to the inputs of the dividers to other the inputs of which receive a signal from the output of the calculator 3 modules, as a result of which the output signals of the Hall sensors are normalized and the inputs of blocks 4 and 5 of the multiplication from the outputs of the division blocks receive signals of constant amplitude. Invention Formula I A device for measuring the module and the cosines of the main flux vector in AC machines, which contains two Hall sensors, outputs connected to the inputs of the first and second operational amplifiers, the outputs of which are connected to the inputs of the calculator module, the output of which is connected to the first output bus, and the inputs with the first inputs of the first and eight ten 20 25 thirty 35 40 45 50 55 the second multiplication units, the outputs of which are connected to the first and second inputs of the regulator, the output connected via the first aperiodic amplifier to the second inputs of the third and fourth multiplication units, the first-: left inputs of the fourth and third multiplication units are connected respectively to the second and third output tires, with the second inputs of the second and first multiplication blocks, respectively, with the first inputs of the fifth and sixth multiplication blocks, respectively, and with the inputs of the square module's intake, the output connected to the first input m proportional to the integral controller, the second input of which is connected to the amplitude setting bus, the absolute value calculator, the first input of which is connected to the second inputs of the third and fourth multiplication blocks, the second. swarm entrance - to the tire displacing eg. and the output to the first input of the seventh multiplication unit, the second exo which is connected to the output of the proportional-integral controller, and the output is connected to the second entrances of the fifth and sixth multiplication units, in order to improve the accuracy measurement - by reducing the phase error, the first, second and third adders, the eighth and ninth multiplication units, two integrating amplifiers and the frequency setting bus are added to it, the first inputs of the first and second adders are connected to the outputs, respectively the third and fourth multiplication units, their second inputs are connected to the outputs of the fifth and sixth multiplication units, respectively, and their outputs to the inputs of the first and second integrating amplifiers, respectively, and to the first inputs of the eighth and ninth multiplication units, the second inputs of which are connected respectively to the third and the second output buses, and the outputs are connected to the inputs of the third adder, the output of which is connected to the third input of the regulator, and the first and second inputs of the last are connected to the second and third inputs respectively It is aperiodic amplifier of the first to fourth input of which is connected to bus frequency reference.