SU1520589A1 - Device for monitoring instability of rotary speed of magnetic disk of storage - Google Patents

Abstract

The invention relates to a technique for measuring and controlling the instability of the speed of rotation of magnetic disks in external storage devices. The purpose of the invention is to expand the functionality and improve the accuracy of measurements. For this, the device performs multiple measurement of discrete values of the rotational speed within one turn of the disk with the subsequent averaging of the measurement values. In this case, an indication is made of the magnitude of instability of the revolutions of the information carrier. 1 il.

Description

The invention relates to instrument engineering and can be used to determine the magnitude of the instability of the speed of rotation of magnetic disks in external storage devices.

The aim of the invention is to extend the functionality and improve measurement accuracy.

The drawing shows a structural block diagram of the device.

The device contains the first 1 and second 2 drivers, frequency multiplier 3, inverter 4, trigger 5, reference generator 6, first 7 and second 8 counters, first 9, second 10 and third 1I registers, first 12 and second 13 comparison blocks, first 14 and the second 15 elements And, the first 16 and second 17 elements OR, the delay element 18, the first indicator 19, the sensor 20, the adder 21, the accumulating adder 22 and the second indicator

23 o In this case, the first device input through the first shaper 1 connected in series, the frequency multiplier 3, the second counter 8 and the first register 9 is combined with the information inputs of the second 10 and third 11 registers, the first 12 and second 13 comparison blocks, as well as the same input of the accumulating adder 22, the second input of the device is connected via the second driver 2 to the inputs of the trigger 5 and inverter 4, the output of which is connected to the first inputs of the first 16 and second 17 elements OR, the outputs of which are respectively connected to the inputs 3. a record of the second 10 and third 11 registers, the information outputs of which are respectively connected to the second inputs of the comparison blocks 12 and 13 and the inputs of the adder 21, the output of which is connected to the first indicator 19, the output of the trigger 5 is combined with the input

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The preset record of the first and second counters, the counting input of the second counter is connected to the reference generator 6, the first output of the second counter is directly connected to the input of the first register and the clock input of the accumulating adder 22, and through the delay element 18 to the first inputs of the first and second elements And the input of the first counter 7 and the input of the second indicator 23f; the information inputs of which are connected to the accumulating adder 22; the overflow trigger of the second counter 8 is connected to the input of the trigger 5, the Record input. first 19 and second 23 indicators, the output of the first comparison unit 12 is connected to the second input of the first element AND 14, the output of which is connected to the second input of the first element OR 16, and the output of the second comparison unit 13 is connected to the second input of the second element 15, whose output connected to the second input of the second element OR 17. At the same time, the direct codes of the setter 20 are connected to the information inputs of the second register 10, and the inverse outputs of the setter 20 are similarly connected to the inputs of the third register 11 „

The device works as follows

In the initial state, all the nodes of the device are reset by a signal (not shown).

The first driver 1 receives an information signal from the disk, on which the reference signal 1 of the maximum permissible frequency is pre-recorded, which is multiplied in frequency by the multiplier 3 and fed to the counting input of the counter 8, the second driver 2 receives an index signal of the engine start speed index signal 1-4 ms, repetition frequency 200 ms, which corresponds to 5 rev / s). The index signal goes to trigger 5 and inverter 4, the signal from inverter 4 through the OR 16 and 17 elements is recorded using ika 20 into registers 10 and 11, respectively, O and 1, the trigger 5 allows account counters 7 and 8, through the fixed time counter 7 (e.g., 2 msec) outputs a first output signal which initially overwrites the accumulated value of pulses with

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the counter 8 to the register 9, and then zero the counter 8 and the count in it begins again. The information accumulated in the counter 8 is proportional to the rotation of the carrier for a short analyzed time interval, the information stored in register 9 as a number is compared with the numerical values recorded in the second 10 and third P registers, and, when the inequalities are fulfilled, the values in the register 9 are rewritten in the second or third registers in such a way that all maximum speed values are, for example, in register 10, and all minimum speeds are in register 11 By applying the obtained values to the corresponding the current inputs of the adder (one of the addends must be given in the inverse code), at the output of the adder 21 the difference of the limit values is recorded by the indicator 19 after the completion of the measurement cycle, the number of measurements is controlled by the capacity of the first counter 7 "

The proposed device has a higher measurement accuracy due to the average of 10.100 measurements and enhanced functionality due to the ability to measure and evaluate disc speed fluctuations within one revolution.

Claims (1)

Invention Formula A device for monitoring the instability of the rotational speed of a magnetic disk of a storage device containing two formers, a setting unit, a comparison unit, an indicator, an element AND, a reference oscillator connected to a counter, characterized in that, in order to enhance the functionality and improve accuracy, a frequency multiplier is introduced into it , second counter, three registers, two units of comparison, trigger, two elements SH, second element AND, element for holding, inverter, second indicator, adder and accumulating adder, with the first input of the device va through a series connection of a first generator, a frequency multiplier, a second counter, a first register coupled to the data inputs of second and third registers of the accumulator, the first inputs the first and second blocks, the information outputs of the second and third registers are respectively connected to the second inputs of the first and second comparison blocks and the adder, the outputs of which are connected to the inputs of the first indicator, the forward and inverse outputs of the setter, respectively, are connected to the information inputs of the second and third registers, the second the input of the device through the second shaper connected in series, the inverter is connected to the first inputs of the OR elements, the outputs of which are respectively connected to the inputs of the The writing of the second and third registers, the output of the second driver, is also connected to the input of the S-trnger, the output of which is connected to the inputs. Record the preset of the first and second counters, the first output of which is connected directly to the inputs of the setpoint, the first register, accumulator and through the delay element. - with the input R of the first counter and the first inputs of the elements And, the second inputs of which are respectively connected to the outputs of the first and second comparison blocks, the outputs of the elements And respectively connected to the second inputs OR elements, the overflow output of the first counter is connected For the first and second indicators, with R-input trigger and letter