SU486446A1 - Pulse distributor for stepper motor control - Google Patents

Description

The invention relates to control devices for electric stepper motors. Pulse distributors for controlling stepper motors are known, comprising a t-stable static trigger, each channel of which includes a key element connected by its input with the output of the coincidence circuit. However, the known pulse distributors are either critical to the duration of the input pulse, or need additional clock pulses, which reduces the reliability of the stepper drive. The purpose of the invention is to increase the reliability of the step drive operation by introducing into each channel the distributor OR circuit connected by one input to the output of a key element of its channel, the second input to the output of the matching circuit of the same channel, and the output to one of the inputs of its matching circuit. and subsequent, his channels. In the reverse pulse distributor, two additional matching circuits are introduced into each channel, connected by one of its inputs to the output of the OR circuit of its channel, and the outputs to the inputs of the main circuits of the previous air circuit, its channel and its subsequent channel. T In FIG. Figures 1 and 2 show the structural diagrams of a non-reversible n reversing W-phase pulse distributor, respectively. The distributor consists of a w-stable static trigger 1, each channel of which contains a key element 2 (3, 4, 5), coincidence circuits 6-9, and OR 10-13 circuits. The reverse pulse distributor contains additional coincidence circuits 14-21, and circuits 14-17 are for one direction of rotation, and circuits 18-21 are for reverse. The number of steady states of a trigger 1 n the number of simultaneously open and closed channels in it determine the connections inside the trigger, which in FIG. 1 and 2 are not shown. The distributor works as follows. In the initial position, trigger 1 is located in one of the w stable positions, with signals that are also supplied to the inputs of the corresponding OR 10-13 circuits on several neighboring outputs. The presence of one of the inputs of the “OR signal” circuit determines the signal of the signal at the output of this circuit. Therefore, if a signal is present at some output of trigger 1, the “OR of this channel” circuit allows the input signal to pass through the matching circuit

6 (7, 8, 9) of your channel. The input signal passes through this coincidence circuit only if there is no inhibitory signal from the adjacent OR circuit.

Since each OR 10-13 circuit (Fig. 1) allows the input signal to pass through the matching circuit of its own channel only and prohibits matching the adjacent matching circuit, the input signal connected to all the matching circuits can pass only through one of these schemes. In this case, the key element of the trigger 1, to the input of which the signal from the output of the coincidence circuit arrives, changes its state, but due to the internal connections of the trigger, a signal appears at the other output of the trigger.

The state of the OR circuit that allowed the input signal to pass to the trigger will not change, because instead of the signal from the trigger output, the OR circuit receives an input signal passing through the coincidence circuit. This determines the switching of the distributor only for one clock cycle and at the moment the input signal arrives. The signal pa of the output of the OR circuit, which permits switching of the trigger, disappears only after the input signal is removed, which ensures the independence of the distributor operation on the duration of the input pulse. The distributor returns to its initial state for the next operation cycle after the end of the input pulse.

To change the distributor recalculation counting, the input signals (Fig. 2) are fed through additional matching schemes

R

14-17 or 18-21 for basic matching schemes 6-9. Additional matching schemes rebuild the links of the OR 10-13 schemes with the main matching schemes of adjacent channels.

Select the number of simultaneously open or closed key elements of the trigger 1

greater than two and equal to 1 for t even

for m odd, it allows to reduce the number of connections inside the distributor. Subject invention

Claims (2)

1. A pulse distributor for controlling a stepper motor, comprising a w-stable static trigger, each channel of which includes a key element associated with an input to the output of a coincidence circuit, characterized in that, in order to increase reliability, an "OR , connected by one input to the output of the key element of its channel, the second input to the output of the matching circuit of the same channel, and the output to one of the inputs of the matching circuit of its own and subsequent channels. 2. The distributor of the "pulses" according to claim 1, characterized in that, in order to obtain a reverse motion of a stepper motor, two additional co-ownership schemes are introduced into each channel, connected by one of the inputs to the output of the "ILU of its channel" and outputs to the inputs of the main matching schemes of the previous and subsequent channels. -,