SU1179535A1 - Shaft turn angle encoder - Google Patents

Abstract

1. SHAFT ANGLE CONVERTER of the CODE containing the generator, the generator output is connected via a frequency divider to the power supply shaper, the output of which is connected to the inputs of the angle sensor, the output of the angle sensor is connected to the information input of the phase shift to code unit whose clock input is connected with a generator, characterized in that, in order to increase the service life of the converter, the output of the power supply voltage driver%; ... o - / is connected to the reference input of the phase-to-code conversion unit. 2. The converter according to claim 1, characterized in that the angle sensor comprises a toothed stator mounted in the housing with internal teeth and a windless rotor mounted on the shaft with external teeth facing the stator, the stator is made in the form of an even number of gear sectors evenly spaced around the circumference at a distance of -r- relative to each other, in the grooves of the sectors of the stator laid about (O coil, the conclusions of which are output (the angle sensor, a multi-pole modulator installed with a gap concentrically inside the rotor, the rotor vyp Completed in the form of a thin-walled cup made of elastic ferromagnetic, pre-magnetized material, the cogging steps i oi of the rotor and the stator are equal; Chika corner. Ate

Description

one

The invention relates to automation and computing and can be used to connect analog information sources with a digital computing device.

The aim of the invention is to increase the service life of the converter angle of rotation of the shaft in the code.

The drawing shows a block diagram of the converter.

The shaft rotation angle-to-code converter contains a generator 1, the generator 1 output through a frequency divider 2 is connected to a power supply shaper 3, the output of which is connected to the inputs of the angle sensor 4, the output of the angle sensor 4 is connected to the information input of the phase-shift block 5, the clock input of which is connected to the generator 1, the output of the power supply voltage generator 3 is connected to the reference input of the phase-to-code conversion unit 5.

The angle sensor 4 includes a serrated 7 stator 7 with internal teeth and a shaft-free rotor 8 mounted on the shaft and with external teeth facing the stator 7 mounted on the shaft, the stator 7 is filled as an even number of gear sectors 9 evenly spaced around the circumference at distance ii relatively each other, in the slots of the sectors

the stator 7 is laid winding 10, the findings of which are the output of the angle sensor 4, a multi-pole modulator 11 mounted concentrically inside the rotor 8, the rotor 8 is made in the form of a jarnpyroro ferromagnetic, pre-magnetized material, the jagged steps of the Ad rotor and the stator are made equal, each toothed sector 9 of the stator 7 is offset by an angle relative to the adjacent tooth sector by

D

and the outputs of the modulator 11 are the inputs of the angle sensor 4.

The Converter operates as follows.

The alternating voltage from the generator 1 is fed to the divider 2, the division factor of which is determined by the number of bits of the exact angle reading. After the divider 2, the alternating voltage is applied to the formarovy352

3, the division factor of which is equal to the number of pole pairs of the modulator 11. The output of the imaging unit 3 forms a multiphase voltage, which is fed by the modulator 11. A rotating magnetic field formed by a multi-pole modulator 11 leads to deformation of the flexible rotor wall 8 (traveling wave)

with the frequency of the multiphase voltage supplied to the modulator 11. A change in the gap between the rotor teeth 8 and the sectors 9 of the stator 7 leads to a change in the magnetic flux that encompasses each signal winding 10, as a result of which in each signal winding 10 alternating voltages are induced, the magnitude which is proportional to the distance

between the teeth of the rotor 8 and the stator 7 and the angular position of the teeth of the rotor 8 relative to the teeth of the sectors 9 of the stator 7. Under the action of the rotating magnetic field of the modulator 11

the rotor wall 8 bends sinusoidally (if the modulator 11, the rotor 8 and the stator 7 are turned into a line, then when the modulator 11 is working 11, the rotor wall 8 each

the moment of time will occupy the position of a sinusoid that is remote from the stator line 7 by the size of the gap between the stator teeth 7 and the undeformed rotor 8). The distance between the teeth of the rotor 8 and the teeth

each sector of the stator 7 at time t can be determined by the formula:

8 8oJ Um5in al4i -0,

where Sg is the gap between the stator teeth and the undeformed rotor,

S2 is the power frequency of the modulator 1 1;

m is the modulation coefficient k is the sequence number of sector 9 of the stator 7 (to 1,2,3,.,. р). The magnitude of the variable voltages in each signal winding (excluding residual voltages) at time t will be

U, Uo Hr "s; n nb (

where UQ is the amplitude of the alternating voltage in the signal winding with the distance between the rotor teeth and the teeth of the corresponding stator sector equal to 8 ,,. During the rotational movement of the rotor 8, the magnitude of the instantaneous voltages in the signal windings will be

U, lJo lm5; r jlblKM) - lj5 n cJo-fc + (KM)

where OQ is the frequency of movement of the teeth during rotation of the rotor.

/ h

Phase angle (k-1; multiply G 2ii

l sin Wpt + Ck-l) J caused by the offset of the teeth of each stator sector

U06

relatively each other on the part

R

steps. As a result of the addition of the voltage of the signal windings with a symmetric system, i.e. with an even number of stator sectors placed evenly around the circumference, the total voltage will be.

U5- | Uo lC05i - oH.

Thus, the rotation of the rotor shifts the phase of the total voltage of the signal windings with respect to the reference (power supply voltage of the modulator 11). Rotating the rotor 8 by one tooth shifts the phase of the total signal voltage to BDO (G3 (jt 2ii).) Unit 5, controlled by the reference and signal voltages and filled from generator 1, fixes the angle of rotation of the rotor 8 in digital form.

The advantage of such a converter is simplicity, durability, high resolution, high accuracy.

Claims (2)

1. A SHAFT ANGLE CONVERTER TO A CODE containing a generator, the output of the generator through a frequency divider is connected to a voltage generator, the output of which is connected to the inputs of the angle sensor, the output of the angle sensor is connected to the information input of the phase shift to code conversion unit, the clock input of which is connected to generator, characterized in that, in order to increase the life of the converter, the output of the supply voltage driver is connected to the reference input of the phase shift to code conversion unit. 2. The converter according to π. 1, characterized in that the angle sensor comprises a gear stator installed in the housing with internal teeth and a winding-free rotor mounted on the shaft with external teeth facing the stator, the stator is made in the form of an even number p of gear sectors evenly spaced around the circumference by ras2) 7 standing p relative to each other, a winding is laid in the grooves of the stator sectors, the terminals of which are the output of the angle sensor, a multi-pole modulator installed with a clearance concentrically inside the rotor, the rotor is made in the form of a thin-walled steel ana of resilient ferromagnetic previously magnetized material claw steps \ of the rotor and the stator are made equal to each toothed sector stator angularly offset with respect to adjacent toothed sector by a value of the modulator are input terminals of a sensor angle. m with joint venture with joint venture