SU1239625A1 - Device for measuring and registering interior angle of synchronous electric machine - Google Patents

Abstract

The invention can be used in experimental studies, as well as in the creation of automated control systems for a synchronous machine. The purpose of the invention is to simplify the measurement process. The device contains a photoelectric sensor 1 of the rotor position, shapers 2 and 3 pulses, delay element 4, key 7, a registering meter device 10 with control input 11 Start, counting input 12, control input 13 Stop and control input 14 Reset. Introduction of a high-frequency generator 5, a frequency divider 6 to 360, a decimal counter 8, a controlled frequency divider 9, and the formation of new connections between the elements of the device allows the device to operate automatically in the entire voltage frequency range, feeding the synchronous machine. This eliminates the need for frequency tuning of the elements of the device and makes it possible to use it in automated control systems of a synchronous machine. 3 il. with (L to oo with od IN: ate

Description

The invention relates to a measurement technique and may find application in experimental studies; as well as in the creation of automated control systems for a synchronous machine.

The purpose of the invention is to simplify the measurement of chickens to ensure the automatic operation of the device in the entire frequency range of the voltage feeding the synchronous machine.

Fig, 1 shows a structural diagram of the proposed device; Fig. 2 is a diagram of a photoelectric rotor position sensor; on fig.Z - pulse diagrams.

The device contains a photoelectric sensor} of the rotor position, shapers of 2 and 3 pulses, delay element 4, high frequency generator 5, frequency divider 6 by 360, Yyuch 7, decimal counter 8, controlled frequency divider 9, registering meter 10, which has control input II Start, counting input 2, control input 13 Stop and control input 14 Reset) and the photoelectric sensor 1 of the rotor position, the first driver, 2 pulses, the element 4 delay 11 Starting the counter I) are connected in series, .out The high-frequency generator 5 is connected to the input of a controlled divider. . 9 frequency and the input of the frequency divider 6 to 360, the output of which is co 6 with the first input of the key 7, the second input of which is connected to the output of the second driver 3 pulses and input 13 Stop of the counter 10, and the output of the key 7. connected to the input of the decimal counter 8 the single outputs of which are connected to the corresponding bit inputs of a controlled frequency divider 9, the output of which is connected. with the counting input 52 of the counter 10, the input of the second driver 3 pulses connected to the input of the device,. and input 14, Reset Counter, is clock.

The photoelectric rotor position sensor (Fig. 2) contains an opaque disk 15 with a hole (or slot) 16, a source 17 of light and a photocell (photodiode) 18,

Plots (fig. 3) depict a sequence of 19 pulses at the output of the imaging unit 3, a sequence of 20 pulses at the output of the controlled

ten

five

20

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divider 9, sequence 21 pulses at the output of the element 4 pulse delays, a single clock pulse 22 TI and schematically shown,. The total number of 23 pulses received in counter 10.

As a rotor position sensor, any non-contact sensor can be used that produces one pulse per revolution of the rotor shaft, for example, a photoelectric sensor (FIG. 2),

The shaper units 2 and 3 pulses (Fig. 1) can be made in the form of threshold devices that produce a square pulse at the output when the input voltage differs from zero or when the input voltage is changed. The basis of them can be applied, for example, Schmitt trigger,

Element 4 pulse delays can be performed on a waiting multi-vibrator with an adjustable duration of the output rectangular pulses. The falling edge of rectangular impulses of a standby forg multivibrator is output impulses of the element 4 of the impulse delay.

High-frequency generator 5 (10 Gd), frequency divider 6 by 360, key 7, decimal counter 8, and controlled frequency divider 9 make it possible to obtain a control output. The second frequency divider 9 is a sequence of pulses with a frequency of 360 times higher than the pulse frequency at the output of the imaging unit of 3 pulses. Thus, during each period of the voltage supplying the synchronous machine, and even varying in time, 360 pulses are uniformly packed,

As the counter 10 can be used electronic digital

25

thirty

35

40

O

a counter having start, stop and reset control inputs for controlling the counting inputs.

The device works as follows.

The light flux from the source 17 (figure 2) after passing through the opening (or slot) 16 1BO of the rotating disk 15 falls on a photodiode 18 connected to the input of the driver 2 (figure 1). A delay element 4 is connected to the output of the driver 2. pulses, the output of which produces a sequence of pulses, is shown in plot 21,

The voltage U from the terminals of the synchronous machine is fed to the input of the former of 3 pulses, at the output of which a sequence of short (10 s) rectangular pulses of the same frequency is formed, shown in plot 19.

The decline of the next (first) pulse from the output of the pulse generator 3 is fed to the control input of the key 7, opens it and the sequence of pulses from the output of the high-frequency generator 5 divided by 360 frequency divider 6. Through the public key 7 the decimal counter 8 begins to fill ,

After the completion of the voltage period and the second pulse from the output of the photo-spinner 3 pulses temporarily closes its key 7, simultaneously the number of pulses written by the decimal counter 8 in the code 1248 from its bit outputs goes the decimal counter of the high-frequency generator 5 of the high-frequency generator corresponding to the given voltage U at the terminals of the synchronous machine is assigned to the corresponding bit inputs of the controlled divider 9 frequency, giving it a certain division coefficient K of the high-frequency generator left state.

After the fall of the second pulse at the output of the driver 3 pulses, the key 7 opens and. starts to transmit consecutive pulses from the output of the frequency separator 6 into the decimal counter 8.

After the completion of the second voltage period U, the third pulse from the output of the converter 3 closes the key 7 for the duration of its duration, decimal counter 8 transmits the information recorded in it to the controlled divider 9 and is set to the zero state. After the fall of the third pulse, key 7 opens, decimal counter 8 begins to fill up again until the fourth pulse arrives, and the described processes are repeated.

During each voltage period and when the decimal counter 8 is filled, the controlled frequency divider 9 does not change the division factor X defined in it, corresponding to

the number recorded by the decimal counter 8 during the previous period of the voltage U, and divides. impulse sequence with gene

RATOR 5 high frequency in accordance with this division factor K

The division factor K is strictly dependent on the frequency f ,, voltage and and is determined from the ratio

K - mfu

where f Hz is the frequency of the high-frequency oscillator 5 (Fig. 1); - the division number of the divider 6 frequency.

The pulse sequence from the output of the controlled frequency divider 9 is fed to the input 12 of the counter 10 and is filled with filling pulses for it. The frequency fj of the filling pulses is in strict accordance with the frequency f (j of the voltage U fr

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fj -jT- - mfu 360 fu.

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thirty

40

50

55

The measurement is preceded by the operation of setting the zero value of the internal angle of the synchronous machine when it is idling in the generator mode.

By adjusting the pulse delay element 4, a pulse is combined at its output (plot 21) with the nearest pulse following at the time (plot .19) at the output of the pulse generator 3 pulses (if, for example, counter 10 responds to positive voltage drops at its input 13). In this case, at the inputs 11 and 13, the control pulses arrive simultaneously and the counter 10 shows zeros.

The operation of setting the zero value of the internal angle is performed once after each fixing of the disk 15 (Fig. 2) of the rotor position sensor on the shaft of the synchronous train.

After setting the internal angle to zero, the synchronous machine is switched to the desired mode. Depending on attached on Val. load, there is a phase shift between the emf and voltage, which causes a temporal shift in the previously combined pulses. Suppose that this corresponds to the position of the pulses from the sequences of pulses on plots 19 and 21 at times t and ta (Fig. 3).

The measurement starts with the arrival of a clock pulse. TI, for example at time t, (plot 22) to control input 14 Reset, while counter 10 is transferred to standby mode. At time t, the pulse from the output of the delay element (plot 21) goes to the control input 1 Start, after which the counter 10 begins to fill with pulses (plot 20) from the output of the controlled frequency divider 9. At time tj, the next in time positive differential pulse from the output of the imaging unit 3 pulses (plot 19), affecting the control input 13 Stop of the counter 10, stops counting.

The counter 10, corresponding to the number of pulses schematically shown in plot 23, which came from the output of controlled frequency divider 9 during the interval of the time points t and tj, unambiguously determines the number of electrical degrees equal to the first corner of the synchronous machine.

The use of the proposed technical solution in comparison with the known one allows to simplify the measurement, ensuring the automatic operation of the device in the entire frequency range of the voltage supplying the synchronous machine, thereby eliminating the need for frequency tuning of the device elements and applying it to automated control systems of the synchronous machine. .

Claims (1)

Invention Formula A device for measuring and recording the internal angle of a synchronous machine, containing a rotor position sensor, a delay element, a counter, first and second pulse drivers, the input of the first of which is connected, 0 is connected to the output of the rotor position sensor, and its output is connected with the input of the delay element, the output of which is connected to the start input of the counter, the input of the second pulse generator 5 is connected to the input of the device, and its output is connected to the input of the counter stop, the input of which is clock, which is simpler neither 0 measurement by ensuring automatic operation of the device in the entire frequency range of the voltage supplying the synchronous machine, a high-frequency generator, a 360 frequency divider, a key, a decimal counter and a controlled frequency divider are inputted into the black, and the output of the high frequency generator is connected with the input of the controlled frequency divider and the input of the frequency divider by 360, whose input is connected to the first input of the key, the control input of which is connected to the output of the second pulse shaper, and the input of the switch is connected to the input ec adic counter The discharge outlets are connected to respective bit inputs dnymi upr1avl emogo The frequencies divider whose output is connected to the counting input of the counter. Fig 2 f J111 | 1E / I L (11PI1N1G 1NNP I11P1G1G11INIGNP111 PNPPPG1G 1PMG1P111 11N11 IP1P 11PY1 j, .. 22 ----- L:; ; - f 23 --M t totjti FKG.Z