RU1780019C - Indicator of shaft sense of rotation - Google Patents

Abstract

The inventive device contains two pulse sensors 1 and 2, two O-flip-flops 3 and 4, two single-vibrator 5 and C. 3-5-6-3-3, 1-3, 1-4, 2-4, 2-5, 6-4. 2 ill.

Description

aaaL

Vj

 /

The invention relates to instrumentation and can be used in devices of instrumentation, mainly intended for use in tachometric systems.

A device for determining the direction of rotation of the shaft is an improvement on the known device for determining the direction of rotation of the shaft according to the author. St. Ms. 645188.

The device for the main author. St. No. 645188 contains two speed sensors and a D-trigger, and the output of each sensor is connected to one of the inputs of the D-trigger.

The disadvantage of the device according to ed. St. No. 645188 consists in the fact that after the shaft rotation is stopped, it continues to signal the direction of rotation, which is unacceptable, for example, during intermittent or cyclic operation of the electric drive, when information about the direction and termination of rotation is used in the process control algorithm. The disadvantage of the device according to ed. St. No. 6451R8 is also the use of a single D-flip-flop and both of its outputs to indicate the direction of rotation, since it turns out to be impossible to use the zero-trigger circuit, because when zero is set to the direct trigger, a single output is set to its inverse level as a signal of direction of rotation.

The chain of the invention is the elimination of the disadvantages of the prototype, i.e. improving the reliability of the device according to ed. St. No. 645188 by improvement.

The goal is achieved by the fact that the second D-flip-flop, the first and second one-shots, the first of which is included in the restart operation mode, and the second into the single-start operation mode, are additionally introduced into the indicated device (and this is the invention): D the input of the second D trigger is connected to the output of the second speed sensor, and the C input of the second D trigger is connected to the output of the first speed sensor, and the output of the second speed sensor is connected through series-connected first and second single vibrators to the combined R inputs of the first of the second and second D-flip-flops, and the inverting output of the second D-flip-flop is the second output of the device.

The beneficial effect of using the proposed device is to enable

determining the direction of rotation at a variable speed with reversing with higher reliability compared to the prototype due to its improvement.

The invention is illustrated in the diagram and timing diagrams shown in FIG. 1 and 2.

The device for determining the direction of rotation (Fig. 1) contains sensors 1 and 2 revolutions, two D-flip-flops 3 and 4 and two single-vibrator 5 and 6, The first D-flip-flop 3 is connected to the output of the speed sensor 1 by a D-input, also connected to the input

5 synchronization of the second D-trigger 4, the D input of which is connected to the output of the second sensor 2 revolutions and to the synchronization input of the first trigger 3. The first one-shot 5 is included in the operation mode with

0 by restarting and is connected to the output of the sensor 2, the second one-shot 6 is included in the operation mode for a single start and connected to the inverse output of the one-shot 5, and the output of the second one-shot 6

5 is connected to the inputs of the zero setting of triggers 3 and 4. The outputs of the triggers 3 and 4 are intended to be connected to the circuits for indicating the direction of rotation forward and backward, respectively.

0 The device operates as follows.

When the power is turned on to the device at time ti, the level is set at the inverse output of the one-shot 5

5 logical units (diagram d in Fig. 2), and at the output of the single-shot 6, an impulse is generated to set the triggers 3 and 4 to the initial, zero state at the direct outputs (Fig, 2e). At time t2, rotation starts and sensor 1 generates an output pulse (Fig. 2a), and at time t3 a pulse is generated at the output of the sensor 2 (Fig. 26). With this pulse of the sensor 2, the one-shot 5 is switched to the zero state at the output (Fig. 2e). which remains in this state until the rotation ceases, since this one-shot operates in a restart mode. At time t3, trigger 3 switches to the single state at the output, since the pulse of sensor 1 received at the D input only prepares the trigger for switching, which occurs along the edge of the pulse at the synchronization input of this trigger.

5 The level of the logic unit established at the output of trigger 3 is activated on the forward direction indication circuit. This state of trigger 3 is maintained until the forward rotation is completed. At time t, rotation stops and

The formation of pulses by the sensors ceases, as well as the moment ts: the dibrator 5 sets the initial state with a logical output unit, since the effect of the pulses on its restart at the time t ceases. By a single-vibrator 6, a pulse is formed at the output of the single-vibrator 5 to set the triggers 3 and 4 to their initial state (Fig. 2c. E, f). as a result, trigger 3 is set to zero, and trigger 4 does not change its state to zero from time ti. At time te, the rotation resumes, but in the other direction (by; -5ad), as a result of which the pulse of sensor 2 is generated first, the one-shot 5 is installed; it vibrates to zero, and at time t, the action of the pulse of sensor 1 on C The trigger input 4 is set to a single state (Fig. 2d) corresponding to the direction of rotation backward. Trigger 3 at this time remains in the zero state. After the rotation stops in the event ts, the effect of the pulses of the sensor 2 on the restart of the single-vibrator 5 is stopped, which at the moment to is set to a single state, and

a single vibrator 6 generates an impulse / reset of the triggers to the initial state (Fig. 2e). Trigger 4 is set to a logic zero state at the output (Fig. 2d). Upon subsequent forward rotation, the processes occur similarly to those described.

Claims (1)

The claims Signal device for determining the direction of rotation of the shaft according to autoswitch No. 645118, characterized in that, in order to increase reliability, it additionally contains a B10roy D-trigger, a first and second one-shot with restart, while the D-input of the second D-trigger is connected to the output of the second speed sensor, and the C-input of the second D- the trigger is connected to the output of the first speed sensor, the output of the second speed sensor through the series-connected first and second single vibrators is connected to the combined R-inputs of the first and second D-triggers, and the non-inverting output of the second D-trigger is the second output of the device, The first one of the single vibrators is turned on to restart, and the second to start once.