SU1249530A1 - Device for determining parameters of d.c. electric drives - Google Patents

Abstract

The invention relates to computing and can be used to determine the parameters of electric drives of various mechanisms. The aim of the invention is to increase the reliability of the data obtained. The device includes analog-digital converters, a display unit, a processing unit made in the form of microcomputers, a clock generator, a frequency divider, a trigger, a counter, a NOT element, an AND element, a switch, a depressor, a memory node, and an OR element. 3 il. u (L to co w al

Description

The invention relates to computing and can be used to calculate the parameters of electric drives of various mechanisms.

The purpose of the invention is to increase the reliability of the information received.

FIG. 1 shows a block diagram of the device; in fig. 2 - time diagrams of the device; in phi 3 - the algorithm of the microcomputer operation.

The device contains analog-to-digital converters 1, a generator of 2 clock pulses, a HE 3 element, an AND 4 element, a frequency divider 5, a trigger 6, a counter 7, a switch 8, a decoder 9, a memory node 10, a processing block 11, a display block 12, element OR 13,

The device works as follows. ,

Suppose that it is necessary to periodically, at predetermined time intervals T. compute and fix on the display units 12 the value of the instantaneous power consumed by the PQ motor circuit

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It is also assumed that the device uses analog-to-digital converters (ADC) parallel action.

From the output of the generator 2, the pulses arrive at the input of the frequency divider 5, at the output of the latter, periodically at intervals of time T appears after the microcomputer is turned on, it waits for the indication of waiting

with a positive impulse. This impulse

resets the counting unit to the zero state, then resets

Chik 7 and trigger 6. At the output of the last igt th g, - - g, ch l o “ao ™ tao, tg, o,

em output port, set the address of the zero-cell node 10, from which the micro-computer reads information about the meter of the first channel into its operational storage node (RAM). The contents of the output port are then incremented by one and the information about the parameter of the second channel is read into RAM, and so on. When the output port has an address that exceeds the final value, the input procedure is completed and the microelectric computer proceeds to processing information about the drive parameters. The engine power is determined, then it is recorded on the display unit. Next, the microcomputer starts the transition of the sign to the zero state. Then the entire process described is repeated. Thus, periodically through

it appears zero, arriving at the input of the waiting sign of the microcomputer 11 and causes its operation in the standby mode, as well as at the address input of the switch 8. The first input is connected to the switch output and the address of the zero cell 6 of the output goes to the address input of the node 10 counter 7. The same signal is fed to the input of the decoder 9 and at its first output a positive signal appears allowing the first ADC to receive the code corresponding to the parameter of the first channel to the input of node 10. The remaining ADCs are closed with zero signals on their enable inputs and their outputs are disconnected from the input of node 10.

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Since the trigger 6 is in the zero state, a single signal at its zero output allows the generator 2 pulses to pass through the NOT 3 element and the AND 4 element to the input of the memory node 10. When the signal at the output of generator 2 goes into the zero state, a positive level is reached at the input of node 10 and the code of the first channel from the output of the first ADC is written into the zero cell of node 10. With the appearance of the next positive pulse of generator 2, the counter 7 is set to wherein its single output sets at the address input of the node 10 the address of the first cell. A positive level appears at the second output of the decoder 9, allowing the second ADC parameter of the second channel to enter the node 10. When the signal at the output of generator 2 goes to zero, the code from the output of the ADC is written to the first cell of node 10.

After the last parameter has been written to node 10 in the clock when the counter goes to the zero state, an overflow appears at its output overflowing the trigger 6 to the one state. The passage of pulses to the input of the record of node 10 is prohibited, and the cell address is now set from the output of the port of processing unit 11 (micro computers). The latter exits standby mode and proceeds to the procedure for entering and processing information from node 10,

After turning on the microcomputer waits for the installation of the sign of waiting in the state of a logical unit, then zero

 oig.gt „nd g,„ - g, hl about “ao ™ t.ao, tg, o,

em output port, set the address of the zero cell of node 10, from which the microcomputer reads information about the meter of the first channel into its operational storage node (RAM). The contents of the output port are then incremented by one and the information about the parameter of the second channel is read into RAM, and so on. When the output port has an address that exceeds the final value, the input procedure is completed and the micro computer goes to the processing of information about the drive parameters. The engine power is determined, then it is recorded on the display unit. Next, the microcomputer starts the transition of the sign to the zero state. Then the entire process described is repeated. Thus, periodically through

time intervals T, the instant engine power value will be output to block 12.

Similarly, other parameters of the drive can be calculated and recorded, for example, the power of the excitation winding, the energy consumed, etc.

The use of the device makes it possible to reduce the time shift between the moments of polling the parameters of two adjacent channels to the period of the pulse generator clock 2 (on the order of tens and units of nanoseconds). This increases the reliability of the information about the measured parameters and thus increases the efficiency of the study of the operation of the electric drive.

A microcomputer Electronics-60 15 VM-16 of version 15 VM-16-002 can be used in the device. The information display unit is connected to the central processor with a pad of control unit B1, which is a part of the micro-AF. The rest of the block is joined by means of a parallel exchange device AND 1, which is part of the microcomputer.

The output buffer of the device AND 1 is used as the information output of the microcomputer (the output port of the microcomputer), and the input buffer of the device AND 1 is used as the information input (input port), 07 bit (requirement A) of the register No device AND 1.

Claims (1)

Invention Formula 40 A device for determining parapet-DC electric drives containing analog-to-digital converters, information inputs of which. j tO f5 20 25 " 0 They are informational inputs of the device, a display unit, whose input is connected to an indicator output of a processing unit made in the form of microcomputers, a clock pulse generator, characterized in that, in order to increase the reliability of the obtained data, a frequency divider, a trigger, a counter, the element NOT, the element AND, the switch, the decoder, the memory node and the OR element, whose inputs are connected respectively to the outputs of the analog-digital converters, the output of the OR element is connected to the information input of the memory node and whose output is connected to the data input of the processing unit, allowing inputs of analog-digital converters are respectively connected to the outputs of the decoder, and the first input of the decoder. the information input of the switch is connected to the information output of the counter, the counting input of which, the inputs of the frequency divider and the element are NOT connected to the output of the clock generator, the output of the element is NOT connected to the first input of the AND element, the second input of which is connected to the zero output of the trigger; the counter input is connected to the output of the frequency divider, a single trigger input is connected to the counter overflow output, the output of the AND element is connected to the write enable input of the memory node, the input input D which is connected to the switch output, the second information input of the switch is connected to the information output of the processing unit, the wait sign of which is input and the control input of the switch are connected to the single output of the trigger.  g   In | --I 8m b-6th.0 0 - record П П П П П Figg   Vvo9 Zanna | --I 8mkra-9VM i G j ./ur/p & (, Outport 1 Neither Not Ps - Uj, Ij, I Fixing pj La Compiler A.Zherenov Editor S.Patrusheva Tehred O.Gortvay Proofreader S.Shekmar Order 4326/50 Circulation 671 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 Fig.Z