SU1098018A1 - Shaft turn angle encoder - Google Patents

Abstract

SHAFT ANGLE CONVERTER IN THE CODE containing the coding rotor, the first and second level discriminators, the current pulse generator and the reading element with a C-shaped magnetic circuit located above the code tracks on one edge of the W-shaped magnetic circuit located above the code path of the older pattern Yes, the first and the second windings connected in opposite are placed, and on the other extreme rod of the llj-shaped magnetic circuit located above the low-order code track, a third winding is placed, distinguishing In order to increase the resolution of the converter, the first and second measuring bridges were inserted into it, the second reading element with the L-shaped magnetic core, on which the fourth winding was placed, which is counter-connected to the third winding, the output of the current pulse generator is connected to the first the inputs of the first and second measuring bridges, the first and second windings are connected respectively to the second and third inputs of the first measuring bridge, and the third and fourth windings are connected, respectively, to W The second and third inputs of the second measuring bridge, the outputs of the first and second measuring bridges are connected respectively to the inputs of the first and second level discriminators, the U-shaped magnetic circuit is located above the low-level code track and is shifted along it from the III-shaped magnetic circuit +1/2 steps of the low-order code track, where O, 1, 2, ... co oo

Description

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The invention relates to automatics, computing and measuring equipment, in particular to devices for representing analogue values in a discrete form.

The known converter of the angle of the shaft into the code contains the W-basic magnetic core, which is located above the two tracks of the coding rotor, namely, the equal lamination pitch shifted relative to 10 o each other by 1/2 of the step l.

The disadvantage of these transducers is the low resolving power determined by the encoder quantum .15

The closest technical solution to the invention is the shaft angle rotation in the code, which has a coding mask (rotor) for two bits, read 20 elements with a single W-magnet wire over code tracks of different bits on which there are two opposite windings connected, connected to the generator of 25 current pulses and to their level disclosures. Analog conversion. The FOB values occur under the conditions of closure and expansion of the W-type rods of the magnet core of the magnetic track in the process of the angular displacement of encoder 2j rotor 2j.

A disadvantage of the known converter is that the reading

elements read signal 1 from ico- - tracks through one w; ag. The step size of the low-order track depends on the maximum electromagnetic effect of the neighboring magnetically conducting sections, of which 40 code tracks consist. This limits the weight of the yivteHHijeHHe of the discharge, reduces the accuracy of the analog value conversion, which leads to an increase in the diameter of the coding rotor, the dimensions of 45 and the weight of the device.

The purpose of the invention is to increase the resolution of the converter angle of rotation of the shaft in the code ,,

Fast 1 goal is reached

the fact that the converter of the angle of rotation of the shaft into the code containing the coding rotor, the first and second level discriminators, the current pulse generator and the first reading element with the W-shaped magnetic circuit located above the code tracks are located on one extreme rod of the W-shaped magnetic circuit, located above the high-level code track, the first and second counter-SO-connected windings are placed, and on the other Kpafi pin of the Ш-shaped MC1nitapus located above the low-level code track, there is a third weaving, per: ay and

the second measuring bridge, the second reading element with the U-shaped manitow, which houses the fourth winding, which is connected to the third winding, the output of the current generator is connected to the first inputs of the first and second measuring bridges, the first and second windings are connected to the corresponding other inputs the first measuring bridge, and the third and fourth windings are connected to the corresponding remaining inputs of the second measuring bridge, the outputs of the first and second measuring bridges are connected to Respectively with the inputs of the first and second discriminators of the level, the U-shaped magnetic circuit is located above the low-order code track and is shifted along it with respect to the high-voltage magnetic circuit by | 1, + 1/2 pitch of the low-level code track, where P 0, 1, 2,. . .

FIG. 1 shows a diagram of converting 1 of the shaft rotation angle into a code for two code bits; FIG. 1, the arrangement of the U-shaped magnetic circuit above the dead-discharge bit relative to another magnetic circuit.

The converter of the angle of rotation of the shaft into the code contains considering elements with a U-shaped magnetic core and with a uJ-shaped magnetic core 2, including extreme rods 3 and 4, an average core 5, 1 Magnetic circuit 2 is located above the coding rotor 6 with two tracks 7 8 different bits. On its rod 3, oeiMOTKH 9 and 10 are located, which are turned on and counter to the measuring bridge 11, the latter is connected to a level 12 discriminator and a generator 13 of current pulses. The winding 9 is located at the end of the rod 3, the winding 10 is near the magnetic core 2. On the rod 4 there is a winding 14, which is connected opposite to the winding 15 located on the magnetic conductor 1. Both windings 14 and 15 are included in the measuring bridge 16, which is similar to a bridge 11 is connected to the discriminator 17 level to the generator 13. The magnetic circuit 1, having rods 18 and 19, is located as well as the core 4 of the magnetic circuit 2 above the track 7 of the slump discharge and is shifted relative to the magnetic circuit 2 in the direction of the angular movement of the rotor HaTP- + l / 2 of the pitch of track 7 rod 3 is located above track 8 of the most significant bit, rod 5 above tracks 7 and 8.

Converting the angle of rotation of the shaft into a code works as follows.

When the converter is turned on, the generator 13 creates a pulsating current in bridges 11 and 16, due to which voltages of different polarities appear in windings 9 and 10, 14 and 15, which determine the voltage on the measuring diagonals of bridges 11 and 16 and respectively inputs discriminators 12 and 17.

The indicated voltages are fully compensated by balancing the strips 11 and 16 under the condition of full or partial shunting of the rods 3 and 5, 4 and 5, 18. and 19 with the magnetically conducting part of the tracks 7 and 8 or with the rods open.

In the process of cornering the rotor 6 in accordance with the step of code tracks 7 and 8, the conditions for shunting change, as a result of which

The main magnetic flux and scattering fluxes in the Zi 5, 18 and 19, 4 and 5 rods unbalance the bridges 11 and 16, signals appear on the inputs of the discriminators 12 and 17. The latter encode the O and 1.

Alternating shu.ntirovaniya rods 4 and 5, 18 and 19 occurs after 1/2 step track 7, the shunting rods 3 and 5 through the step track 8. Therefore, at the input of the discriminator 17, the signals corresponding to O and 1 appear through 1 / 2 steps of track 7, at the input of the discriminator 12 - through one step of track 8.

Signals corresponding to the junior low pressure shoe appear in the rotor position when the rods 4, 5 and 18, 19 are shunted simultaneously. At this moment, the voltages on the windings 14 and 15 are equal in magnitude and inverse in sign. Therefore, compensate each other.

In the proposed device, reading 1 from the low-order track takes place in 1/2 steps, so that the proposed device provides an increase in the accuracy of converting the analog value twice as compared to the prototype.

In addition, with the same weight of the lower-order bits of the proposed device and the prototype in the first device, the diameter of the crown of the rotor is two times smaller. Due to this, the structure has a smaller size, weight. The time spent on its production is reduced, the consumption of material resources is reduced.

The economic effect of using the proposed converter of the angle of rotation of the shaft into a code is due to its technical advantages.

Claims (1)

(5 7) A SHAFT TURN ANGLE CONVERTER TO A CODE containing a coding rotor, first and second level discriminators, a current pulse generator and a reading element with a W-shaped magnetic circuit located above the code tracks on one ^ extreme shaft of the Sh-shaped magnetic circuit located above the code path of the senior discharge, the first and second counterclockwise windings are placed, and on the other extreme terminal of the 11] -shaped magnetic circuit located above the code track of the lower order, the third winding is located, characterized by I mean that, in order to increase the resolution of the transducer, the first and second measuring bridges are introduced into it, the second reading element with a U-shaped magnetic conduit, on which the fourth winding is located, which is counter-connected with the third winding, the output of the current pulse generator is connected to the first inputs of the first and second measuring bridges, the first and second windings are connected respectively to the second and third inputs of the first measuring bridge, and the third and fourth windings are connected, respectively, with the second and three by the inputs of the second measuring bridge, the outputs of the first and second measuring bridges are connected respectively to the inputs of the first and second level discriminators, the U-shaped magnetic circuit is located above the low-order code track and is displaced along it from the 111-shaped magnetic circuit by n + 1/2 steps of the code track low order, where = 0, 1, 2, ...