SU1702510A2 - Step-by-step engine control device - Google Patents

Abstract

The invention relates to electrical engineering and can be used in a discrete electric drive of machine tools. The aim of the invention is to improve the heat and power characteristics of the device by dynamically adjusting the parameters of the phase current curve taking into account the frequency of rotation of the motor shaft. The device contains 2J permanent memory, trigger 25 , counter 23. shaper 24, register 22 and three digital adders 18-20. The ROM contains a set of digital equivalents of forcing current, parking current, and forcing duration, which are summed with digital equivalents of these parameters, specified by computer. The values of these parameters defined by the ROM contents are set depending on the current shaft rotation frequency during the first period of the clock frequency input to the pulse distributor. The choice of the optimal values of the parameters of the phase current curve begins with maximum values, which does not cause a deterioration in the dynamic characteristics of the device. 1 il. Yo

Description

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The invention relates to electrical engineering, namely to an electric drive with a stepper motor, and can be used in machine control systems.

The goal of this is to improve the thermal and energy characteristics of the device by introducing a dynamic peiynwpo a of the parameters of the phase current.

The drawing shows a functional diagram of the device.

A device with an imool distributor (not shown), a power supply 1 and an external power amplifier, each unit including a key 2, a winding G ID node / i 4 discharge current and shunt5, b the current of the SD phase, consisting of comparator 7, st connected to one shunt 5, and the second input to the output of adder 8, programmable delay element (SEC) 9, element 10, converter 11 code-anapog (PCA) level of the parking current, input register 12 of the parking current level and converter 13 code analogue (PKA) for foryroki current level. Comparator 7 is connected to the shun volume 5 by one input, the second input is connected to the output of the adder 8, and the output is connected to the input B of the adder 8, the first input of the And 10 element and the control of PES 9. The input B of the adder 8 is connected to the output of PKA 11, and input A - with the PKA 13 output, the input of which is connected to the outputs of the element I 14; the first inputs of the elements 14 and 14 are connected to the outputs of the register 15, and the second inputs are connected to the output of the trigger 16 connected by the input S with the output of the CI 9, and input R - with the output of the pulse distributor Inputs MI 9 are connected to the output of the register 17 delay Delay PKA 1 i connected to the output I will give the register 12 levels of current stand

The current control flea 6 also has three digital adders 18-20, a persistent storage device (H3V) 21, a register 22, a pulse counter 23, a driver 24, a generator 25, and a trigger 26 whose input S is connected to the input of the pulse distributor R input. the input R of the pulse counter 23 and the input of the pulsator distributor, and the output of the trigger 26 are connected to the input of the generator frequency blocking 25, the output of which is connected to the counting input of the pulse counter 23 and the input of the ramp 24. The output of the ramp 24 is connected to the input of the register 22, the inputs whom Ina with counter outputs 23, and outputs with address inputs of ROM 21. The first group of outputs of ROM 21 is associated with the first inputs of the first digital-on adder 18, the second group of outputs - with the first inputs of the second digital adder 19, the third group of outputs - with the first the inputs of the third digital adder 20 The second inputs of the first, second and third digital adders are the inputs

mi device. The outputs of the adders are associated with the inputs of the re (Istra 17 delay, register 15 level of the forcing current and register 12 of the tick level, respectively

Device follow hp

0 S

Key 2 locked in its initial state: low voOBH ,. The M signal from the output of the pulse distributor winds the SMs disconnecting 1-1-o from the power source 1, the trigger 26 blocks 5 the rattor gene 25, the output of the counter 23 is a zero code. which provides for the Lc outputs of ROM 1, the codes for the maximum value of the first components of the phase curve parameters

0 whose second components are determined by the codes received from an external device (computer). Parameters of the phase current curve are understood as average

value of standing current (1Ct Her +), average value of forcing current (1Cp

1F) and the duration of the current forcing (TF T F + TF)

The trigger 16 permits the passage of a code from the output of the register 15 to the input of the PLC 13. The signal level at the output of the adder 8 is 1 of three components. The first of them is determined by the code from the output of the PLC 13 and corresponds to the forcing current, the second is defined by the code PC 11 and corresponds to the gok station one third is determined by the signal level from the output of the comparator 7 and corresponds to the magnitude of the phase current increment (D1) relative to its average value B

In the initial state, the signal level at the output of the adder 8 corresponds to the maximum value, which is the sum of the maximum value of the boost current.

0 Gmax 4)

maximum current

hundred nki (1 1Max-i lcrj and phase current increments (AJ)

With the arrival of the active level from the output of the pulse distribution, the key 2 opens, the current e phase of the SM increases to the value determined by the signal level at the output of the adder 8, after which the MOTE 9 is started and the key 2 is locked, from the components of the current & the output of the adder 8 eliminates the remaining L I, the current in phase starts

decrease to the value determined by the level of the signal at the output of the adder 8 Next, the key 2 and the process postor with Meoz turn on the time, determined by the CALM T, from the adder signal components

8, the force current component is turned off, and the phase current is maintained at the level of the gun.

With the arrival of the resolution signal from the pulse jac limiter, the optimum values of the average values of the forcing current, stationary current and

The duration of the TS L GRISIROB I. When GOM

the signal t gusg; the limiter pulses are set to p trigger 2 in COCIORHH, which has a blocking d with a d ° ° rator 25, the frequency is very low and has a small frequency at the frequency of the pulse distributor. Gk is under count 23 and register 22 is starting to increase. This leads to a change in the contents of the outputs n3V °, so that there is a clever 1 urn "of the values of the blue components of the criteria for

current (1st 1f, Tf) starting from maximum values, the first, e pulse received at the input of the pulse distributor to establish the active level at its output blocks the generator 25 and resets the counter 23. At the output of the register 22 the last value of the counter 3 is fixed According to the ROM 21, it sets the average values of the phase current curve (st; f, Tf) for a given clock speed of the SM motor shaft rotation With the arrival of the pulse distributor following the active level coming from the output of the pulse distributor th eye repeated.

At the initial moment of time, the parameters of the phase current curve are set to maximum, the backward time is necessary to select their optimum value 1

five

five

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does not impair the dynamic characteristics of the device.

With a change in the frequency of rotation of the SM shaft, the average values of the parameters of the phase current change in such a way that it improves the heat and power characteristics of the device.

Claims (1)

The invention is a device for controlling a stepper motor according to the author. St. No. 1023614, characterized in that, in order to improve the heat and power characteristics, three digital totalizers were introduced into each unit of the engine phase of the engine overpowering. Permanent memory device, register, pulse counter, Shaper, generator, trigger, the 5-input of which is connected to the output of the pulse distributor. R input - with the R input of the pulse counter and the input of the pulse distributor, the output of the trigger is connected to the input of the generator frequency blocking, the output of which is connected to the counting input of the pulse counter and the input of the driver, the output of which is connected are connected to the outputs of the counter, and the outputs are connected to the address inputs of a permanent storage device, the first group of outputs of which is connected to the first inputs of the first digital adder, the second group of outputs - to the first inputs of the second The third digital group of outputs is with the first inputs of the third digital adder, the second inputs of the digital adders are device inputs and the outputs of the adders are connected to the inputs of the delay register, force current level register and parking current level register, respectively.