SU640348A1 - Shaft angular position-to-code converter - Google Patents

Description

one

The invention relates to elements of numerical control systems for machines and mechanisms.

Converters of the angle of rotation of the shaft b are known, a code containing magnetic readout systems, made on the basis of stationary magnetically controlled contacts as readout elements and rotary control, and its element in the form of permanent magnets 1.

A disadvantage of the known converters of the angle of rotation of the shaft into the code is the relatively low accuracy and reliability of operation.

And the closest technical solution to the invention is a shaft rotation angle converter into a code containing coarse and precise readout magnetic systems, made in the form of a rotor, on which a control element is placed, and a disk stator, on which magnetic circuits are located around the circumference. contacts, and a conversion unit made of OR elements, keys and a decoder 2.

The disadvantage of this known device is the limitation of accuracy due to the specific appearance of hysteresis (unequal response and release angles) inherent in magnetic contacts.

due to their unequal magnetic resistance in the closed and open states.

The purpose of the invention is to increase the accuracy of the device.

For this purpose, an adder and two encoders, an angular division selector of a coarse magnetic readout system, a rotor half-turn comparator of an accurate precision magnetic readout rotor, magnetically controlled stator contacts of a coarse magnetic readout system are connected to the conversion unit. readout of a rough countdown and to one of the inputs of keys, to the other inputs of which are connected the outputs of the selector of angular divisions of a coarse magnetic system the output, to the second inputs of which is connected the output of the comparator half a turn of the rotor of the magnetic reading system of a coarse counting, connected by its inputs to the magnetically controlled stator contacts of the magnetic reading system of the exact reading and to the inputs of the decoder, the outputs of which through the first encoder are connected to one input of the adder, with the other input through the second encoder connected the outputs of the keys.

FIG. 1 is a schematic diagram of the proposed device; FIG. 2 is a pie chart of information signals in the device.

The rotation angle to code converter contains a coarse reference magnetic reading system in the form of a rotor 1, conjugated with a receiver 2 rotation angle, for example, a selsyn, through a gearbox 3, and a disk stator 4, on which circumferentially magnetic contacts 5 are located, on the rotor 1 The control element 6 is placed, for example, in the form of a permanent magnet. The gear 3 is connected via the hollow axis of the rotor 1 to the rotor 7 with the control magnetic element 8 of the magnetic readout system of the exact reading on the basis of the disk stator 9 with the magnetic control contacts 10. Structurally, the magnetic readout systems of the coarse and exact readings are similar. The first pins of the magnetically controlled contacts 5 and 10 on each stator 4, 9 are connected to each other and to the power source with a common contact pad (hatched area of the disks), and the second pins serve as discrete signal sources for the terminal adder 11, having 12 and 13 older and the lower order bits are two encoders 14, 15.

The coder 14 is connected to the coarse reference system contacts 5 via two-input keys 16, and the coder 15 to accurate reference system contacts 10 via a decoder 17 made on prohibition elements 18. The first inputs 19 of keys 16 are connected to three distribution elements OR 20- 22 in such a way that the first inputs 23 are respectively connected to the first, second and third contacts, the second inputs 24 to the fourth, fifth and sixth, the remaining inputs to other contacts alternating in two numbers in the same order.

The OR elements 20-22 connect the first-time inputs 19 of the keys 16 to their second inputs 25 through a selector 26 of the angular divisions 14 of the stator of the coarse-reading magnetic system. Each of the three channels of the selector 26 has two signal 27, 28 and one reference 29 inputs. The first input 27 of the first channel is connected to the output of the third element OR 20, the second input 28 is connected to the output of the second element OR 21. The same inputs 27, 28 of the second and third channels are connected to the outputs of the elements OR 20-22 by circular transposition. The reference inputs 29 of all channels are connected to the contacts 10 of the magnetic reading system of the exact reading through the comparator half-turn 30 of the rotor 7 of the magnetic reading system of the exact reading, and the outputs 31-33 of each channel are connected respectively to the second input 25 of the keys 16, the first input 19 of which

connected to the input element OR 20-22, respectively.

Each key of the selector 26 is made in the form of an element OR 34, containing at the inputs an element of the locked 35 and a second inverting element OR 36. In this case, the two signal inputs of elements 35 and 36 are combined and serve as the channel's reference input 29

35 and the second input of the converting element OR 36 serve respectively the first and second inputs of the channel.

The elements of the prohibition 18 in the screen 17 have a signal 37 and prohibit 38

entrances. The last of them is connected to the signal input 37 of the element 18 next in rank (relative to the rotation of the rotor 7 clockwise). In the last element 18, the input 38 is connected to the signal input 37 of the first element 18 of the decoder 17.

The half-turn comparator 30 is made in the form of an OR element 39, which connects the outputs of half of the contacts 40 of the magnetic reading system of the exact reading, and the outputs of the first 40 and the last 41 of its contacts are combined to the element OR 39 of the inhibit element 42 with a connection similar to that used in the decoder 17.

To control the operation of the device, additional strobe signals 43, 44 are introduced into the encoders 14 and 15. The circular diagram (see Fig. 2) arbitrarily represents the unit values of the logical signals AJ and ig, the corresponding closed states of the contacts 5 and 10. with an increase in the order numbers of i, 2, 3, ... by

clockwise, as well as the unit state of the signal S from the comparator half a turn 30 in P1 and IV quadrants of the stator 9. The symbols Bj and bi denote the corresponding logical signals of each / -th key 16

and / -H output deflector 17.

The principle of the device is based on the selection of a single value of the signals Bj and bi, which unambiguously correspond to the angular position of the pho and fn rotors 1 and 7, and

also the subsequent code encryption in the encoders 14 and 15 of the serial number of the youngest of two contacts, between which the polarization of the rotor of the film and fnl. These codes are scored on inputs 12

Claims (2)

1. L. A. Sribner. “Travel switches on magnetic contacts, 1971, p. 18-20. 2. USSR author's certificate No. 364010, cl. G 08 C 9/08, 1971.