SU136098A1 - Induction converter of an angle of rotation of a shaft to a digital code - Google Patents

Description

Known induction converters for turning a shaft into a digital code, containing a rotating drum with a magnetic rush, fixed and a fixed reading magnetic heads, and a clock pulse generator. the presence of errors due to the instability of the frequency of the generator of clock pulses and the speed of rotation of the drum, for which it is used va counter connected to the input of a digital computer and intended for olnovremen-code recording hydrochloric proportional 360 °, and code, which is proportional (360 ° -a), where a - convertible angle.

The functional diagram of the proposed induction converter is shown in the drawing.

On the drum /, mounted on the shaft of the electric motor 2, magnetic risk 3 is applied. Above the drum are reading magnetic heads-stationary 4 and mobile 5, rigidly connected with the shaft of the information source, the angular position of which is converted into a digital code. With the rotation of the drum / motor magnetic risk; The hpd-drive under the magnetic head 4, induces a pulse in it through the amplifier unit 6 to the counting input of the control trigger 7. Normally, the trigger 7 is set to the state in which the coincidence circuit 8 is closed and the clock generator pulses 9 do not pass to the input of the counter 10. The pulse of the head 4 transfers the trigger 7 to the state in which the coincidence circuit 8 opens and the input of the counter 10 starts to arrive counting pulses. At this time, the coincidence circuit 11, having two potential entries, will open only to one of them. With further rotation of the drum magnetic risk, the passage under the magnetic head 5, induces a pulse in it through the block 12 amplifiers

No. 136098-2 to the counting input of the control trigger 13, which opens the circuit // on the second potential input and the generator 9 pulses start to flow into the counter 14.

Having made a complete revolution, the magnetic risk will again pass under the magnetic head 4, the pulse of which will transfer the trigger 7 to the initial state, and thereby close the coincidence circuits 8 and 11. Codes are set up on the counters corresponding to 360 ° and 360 °, where a is the convertible angle.

From the trailing edge of the trigger pulse 7, corresponding to the moment of the end of the conversion, a pulse is generated, which arrives at the input of the trigger (5), which controls the valve 16, and waits for the multivibrator / 7. In case a request pulse (input 18, from the digital computational mask, it passes through the opening valve 16 to the input of the waiting multivibrator 19, producing a pulse of duration which through the amplifier-driver 20 enters the output gates 21 and 22 of the 360 ° and 360 codes This opens up the digital computing machine and opens them. From the output of the standby multivibrator P, a pulse of duration formed by the shaping amplifiers 23 and 24 is used to set all circuit elements to their initial state.

In the proposed converter, the change in the angle rx during the conversion time does not affect the accuracy of the device, since the arrival of the generator pulses to the counter 14, in which the code of the angle to be converted is fixed and begins after passing the magnetic risks under the movable magnetic head 5, producing a pulse arriving control trigger 13 and a digital computational time timer 25, which records the true acquisition time. The use of two counters in the proposed transducer, at the same time fixing codes corresponding to 360 ° and 360 °, reduces errors from generator frequency instability and drum speed to a minimum. Indeed, a change in the frequency of the generator or the speed of rotation of the drum will lead to a change in the codes of the numbers 360 ° and 360 ° - a, but since both numbers are sent to the digital computing machine where their ratio is taken and determined a, the error is automatically eliminated.

Subject invention

Induction converter of an angle of rotation of a shaft to a digital code. containing a swinging drum with a magnetic risk, a movable and stationary reading magnetic heads and a clock pulse generator, characterized in that, in order to eliminate inconsistencies from the frequency instability of the clock pulse generator and the speed of rotation of the drum, it uses two counters that simultaneously record a code proportional to 360 °, and a code proportional to 360 ° (where α is the convertible angle) connected to the input of a digital computer.

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