SU1153388A2 - Device for controlling step motor - Google Patents

Abstract

1. APPROACH FOR CONTROLLING A STEP ENGINE on author. St. N 1069116, characterized in that, in order to expand the functionality by adjusting the fragmentation factor of a step, two groups of OR elements are introduced according to the number of bits of the reversible counter in each connected outputs to the inputs of the corresponding transducers; the code is analog; the groups of elements OR are connected to the direct outputs of the bits of the reversing sensor, and the other group with the inverse outputs of the same bits. 2. The device according to claim 1, characterized in that it introduces a frequency converter - analog and threshold elements according to the number of bits of the counter, connected by outputs to the second inputs of the OR elements of both groups, and inputs through the frequency converter - analog - to the inputs reversible counter.

Description

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FIELD: electrical engineering. namely, k stepper motor control, and can be used in precision automatic control systems.

According to the main author. St. No. 1069116, a device for controlling a step motor of a step is known, which contains current regulators according to the number of motor phases, a reversible counter, code-analog converters, keys, the number of which is twice the number of motor phases, and a pulse distributor connected by inputs to the transfer and reverse outputs of the reversible counter, connected to the direct outputs of all bits with the inputs of the first converter, the code is analog, and the inverse outputs with the inputs of the second converter, the code is analog, connected by output to the signal inputs of one half of the keys connected by the control inputs to the corresponding outputs of the pulse distributor, also connected to the corresponding control inputs of the other half of the keys connected by the signal inputs to the output of the first converter, the code is analog, and the outputs of the keys connected to different converter codes are connected in pairs and connected to the inputs of the corresponding current stabilizers 1

The drawback of the device is the limitation of the functional possibilities, since it does not allow to change the fragmentation factor of the step within one structure without changing the connections and the number of elements.

The aim of the invention is to enhance the functionality by adjusting the step fragmentation factor.

The goal is achieved by introducing two groups of OR elements into a device for controlling a stepper motor with crushing a step by the number of reversible counter bits each connected by outputs to the inputs of the corresponding transducers, the code is analog, and the first inputs of one group of OR elements are connected to direct the outputs of the bits of the reverse, and the other group - with the inverse outputs of the same bits.

In addition, a frequency converter is introduced into the device - analog and threshold elements according to the number of bits of the reverse / h counter of the counter, connected by outputs to the second inputs of the OR elements of both groups, and entered through the frequency converter is analog to the inputs of the reverse counter.

Such an embodiment of the device allows for iqjorpaMMe or, as a function of the control frequency, to change the coefficient;

flexibly adjusting the step price and the quality of movement.

FIG. shows the functional diagram of the device in relation to the four-phase

stepping motor; in fig. 2 - time diagrams of sigals; in fig. 3 is a diagram of the device with reference to a three-phase stepping motor.

The device (Fig. I and 3) contains a reversible counter 1, converters code analog 2 and 3, reversing pulse distributor 4, a multi-channel power amplifier, each channel of which consists of keys 5 and 6 ,. transistor 7 binding

a control winding (phase) 8 of a stepper motor with a power source U, a current feedback resistor 9, and a block for changing the step crushing ratio, consisting of OR 10 elements forming two groups,

frequency converter - analogue 11 and threshold elements 12.

The direct outputs of the bits of the reversible counter 1 are connected to the first inputs of the elements OR 10 of the same group connected by the outputs of the converter inputs analog code 2, and the inverse outputs of the bits of the reversible counter 1 are connected to the first inputs of the elements of the 10 other groups connected by the outputs of the inputs of the converter . analogue code 3. The second inputs of the elements OR 10 are connected to the outputs of the threshold elements 12, which are connected to the output of the frequency converter - analogue AND, whose inputs are connected in parallel

reversible counter inputs. the converter code - analog 2 is connected to the signal inputs of the keys 5 of all channels of the power amplifier, and the output of the code converter - ad halogen 3 - to the signal inputs of the keys 6 of all channels of the power amplifier. The control input keys 5 and 6 are connected in pairs with the outputs of the reversing distributor 4, the inputs of the direction of movement of which B, H are connected to the transfer outputs of the reversible counter 1.

The device works with a single way.

Control pulses with a frequency f (Fig. 2) come from the Spike driver device (not shown) at one of the inputs B (conditionally forward) or H (conventionally backward movement). The capacity of the counter 1 is chosen equal to the maximum crushing coefficient Pts.,. The required coefficient of love p (n p get the conversion of the code generated by the counter 1 by supplying the inputs I. ,, Uj, and (Fig. 1) of the elements OR 10 of the system of sigals in the code with the filling or from an external device.

or from the threshold elements 12, depending on the frequency of the control pulses.

In both cases, the code is converted according to the table.

ABOUT

About About About 1 1 1

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one . one

about 1 about

1 o o o

1 o

one

one

about about about 1

about 1 1 about about 1

oh oh oh oh oh

oh oh oh oh oh

00

one

about 1

eleven

about 1

The signals from the outputs of the elements OR 10 are fed to the code-analogue transducers, and the code-analogue 2 appears at the converter output; a step-wise voltage appears (or constant in the case of item 1), and at the output of the converter 3, it decreases stepwise. . The reversing pulse distributor 4 with its output signals provides the necessary switching of keys 5 and 6, which alternately connect the converters, the code analogue to the transistors 7 of each channel of the power amplifier. In this case, in phases 8 of a jog motor, stepwise currents i .j - i are formed (Fig. 2). The resistor 9 in the transistor 7 circuit of each channel provides the power amplifier in the current stabilization mode, which improves the accuracy of step processing and reduces the effect of the oscillations of the supply voltage and the variation in the matching of the phase of the voltage transducer. Changing the direction of movement of the jog motor is provided by changing the inputs of the reversible counter. The number of threshold elements is selected depending on the desired smoothness of the change in the fragmentation factor, and the fragmentation factor, n, can be determined from the expression

K K

 Oh oh

where K is the number of the highest bit filled with a unit.

FIG. 3 shows another variant of the scheme of the proposed device with reference to a three-phase stepping motor. The principle of operation of the device is similar to that described.

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Claims (2)

1. DEVICE FOR CONTROLLING A STEP-BY-STEP ENGINE by ed. St. Ν '1069116, characterized in that, in order to expand the functionality by adjusting the step fragmentation coefficient, two groups of OR elements are introduced into it by the number of bits of the reversible counter in each, connected by the outputs to the inputs of the corresponding code converters is an analog, the first the inputs of one group of OR elements are connected to the direct outputs of the bits of the reversible counter, and the other group to the inverse outputs of the same bits. 2. The device pop. 1, characterized in that a frequency converter is introduced into it - an analogue and threshold elements according to the number of bits of the counter, connected by outputs to the second inputs of the OR elements of both groups, and inputs through a frequency converter - analogue - to the inputs of a reversible counter.