SU830319A2 - Device for testing stepping motors - Google Patents

Description

one

The invention relates to automation and can be used in devices having a device as an actuating element of discrete rotation.

According to the main auth. No. 523392, a device for monitoring stepper motors, used, for example, in tracking systems for improving the accuracy of monitoring step testing, is known. This device contains a position sensor, a memory element, an indication and failure detection unit, two switching units, two amplifiers, an AND-OR element and an AND element, the outputs of the position sensor are connected to the inputs of the AND-OR element, the indication and recording module of the failure and the first the switching unit, the outputs of which are connected to the memory element, the outputs of the second switching unit are connected to the inputs of the indication and registration module of the failure, the AND-OR element and, through amplifiers, to the inputs of the memory element whose outputs are connected to the node 1 and the second of the switching unit, the information input of which through the AND element is connected to the indication and failure detection unit til.

The disadvantage of such a device is the unsatisfactory accuracy of the control results, since during the pauses between the pulses of the test, the shaft of the stepper motor under the action of external forces can perform one or several turns and stop again in the initial state. Such an occurrence can occur when a stepper motor is used, for example, to move a regulator thermal, hydraulic, etc. the system by means of a cable wound onto the engine-mounted reel, and if, in the pause between the working out pulses, the braking device does not keep the shaft from rotating. In this case, after the next testing pulse arrives, the device gives 0 a false signal, corresponding only to the position of the shaft, but not responding to the response of the driven regulating

body.

The purpose of the invention is to increase the reliability of the control results. The goal is achieved by the fact that in the device for controlling stepper motors, two single vibrators and an additional element And, a trigger and an indicator are connected in series, the second input of the trigger is connected to the control input of the device, and the second output is connected to the recording input of the element And, the inputs of one vibrator connected to the outputs of the position sensor, and outputs to the inputs of the additional element I.

The drawing shows a structural device heme.

The device contains a 1-position sensor, a memory element 2, switching units 3 and 4, a failure indication and recording unit 5, an AND-B element, amplifiers 7 and 8, an AND 9 element, an information pulse of 10 working hours, an input 11 Coordination, output 12 to the control unit of the discrete rotation device, trigger 13 sensor 1, elements, AND 14-19, trigger 20, indicator 21, additional element AND 22, trigger 23, one-shot 24, 25 and button 26 Error received.

The device works as follows.

After testing the next step, during the pause between the testing pulses, there is no signal at input 10. The signal of one of the outputs of the trigger 13 of the sensor 1 position sets. memory element 2 to the appropriate position. Since there is no signal at input 10, there is no signal at input 12, at block 5 of indication and registration of failure. With an unforeseen detour, this time, under the influence of external shaft forces of a stepper motor (not shown), the position sensor 1 switches the flip-flop 13, at the second output of which a signal appears and, for example, a one-shot 24. than the pause between the pulses of mining. When the shaft continues (and rotates, returns to its original position), trigger 13 again switches, which now starts the one-shot 25. The signal at its output coincides in time b with the saving signal of the one-shot 24, and the element 22 switches to

trigger 23 to a new state, which is indicated as Fail. From the output of the latter, the signal enters the element And 9, ensuring its locking. If it is necessary to continue the steps, button 26 is pressed, and the trigger 23 is reset, and the pulses continue to flow to block 4. In cases when the shaft of the stepping motor does not occur, setting the sensor 1 to the next position triggers None of the single vibrators 24, 25, and the And 22 element allows triggering of the trigger 23 and stopping the step processing.

The use of the invention makes it possible to detect changes in the position of the shaft of a stepper motor under the influence of external influences in the pauses between the pulses of testing and thereby provides more complete control of the executive part of the system of discrete rotation, increasing the reliability of the control results;

The invention can also be used in control systems of linear stepper motors containing several sensors of intermediate and end positions.

Claims (1)

1. USSR author's certificate No. 523392, cl. G 05 V 23/02, 1973 (prototype).