SU387411A1 - CORNER CONVERTER - Google Patents

Description

one

The invention relates to automation and computing and serves to measure the angle of rotation of the shaft.

Angle-code converters are known that contain a stator in which four ferrite Tori with reading and excitation windings, a rotor with three magnets arranged at an angle of 120 ° to each other, and an excitation winding power source are installed at 90 ° to each other.

However, the known devices are characterized by low reliability.

The aim of the invention is to increase the reliability of the converter.

For this purpose, a trigger and a phase-sensitive unit are installed in it, the first input of which is connected to the serially connected excitation windings, and the second to the serially connected reading windings, the single and zero inputs of the trigger are connected to the first and second inputs of the phase-sensitive unit, respectively.

The invention is illustrated in the drawings. FIG. 1 shows a circuit diagram of a converter; in fig. 2 shows a circuit diagram of an assembly consisting of a stator / in which four ferrite tori 2 are installed, with windings 3 (see FIG. 1) excitation and 4 readings, rotor 5 with magnets 6, (see FIG. 2), a power supply 7, a phase-sensitive unit 8, containing an additional ferrite torus 9 with one excitation winding 10 and two readings windings 11 and 12, transistors 13, 14, diode 15, resistors 16, 17, and trigger 18.

On identical ferrite tori 2 (see Figs. 1 and 2) with a rectangular hysteresis loop or a non-rectangular hysteresis loop, windings 4 of the readings and excitation windings 3 are applied to which alternating current is supplied from the power source 7.

The same current feeds the excitation winding 10 of the control torus 9 of ferrite with output windings 11, 12 connected to the emitters and bases of transistors 13, 14, the collectors of which through diode 15 are connected to the windings 4.

The useful sensor signal is removed from resistors 16, 17 and fed to a symmetric trigger 18. One: of the magnets 6, coupled

with controlled movement or rotation, alternately magnetized ferrites 2, while on the “magnetized ferrite will drop sharply e. d. the output and the diode 15 receive voltage pulses of the corresponding phase.

An even number of tori 2 is located around the ring (see Fig. 1) within which the magnets 6 rotate with an angular distance

360

360 +

ABOUT

where n is the number of magnets (at least three), p is the angle between ferrites, t is the number of ferrite tori (the nonius principle is used).

At the indicated ratios in one revolution, the sensor will issue the next, its number of pulses.

When one of the magnets 6 "magnetizes one of the ferrite. Mountains 2, then e. d. on its output winding, 4 readings will almost disappear, the balance of balanced ε. d. broken at the output of the windings 4, Vits variable e. d. appropriate phase. Diode 15 transmits only negative half-waves e. d. From FIG. As can be seen in Fig. 1, the windings 11, 12 of the ferrite torus 9 are turned on so that alternately, after every half-period of the voltage of source 7, turn on transistors 13, 14. Thus, the rectification becomes phase-sensitive.

The proposed layout of the scheme eliminates the erroneous slamming of tr: igger, since

as the magnets move, the phase e. It gradually reaches zero and also smoothly reaches the maximum of the opposite phase, which determined the reliable operation of the sensor at arbitrarily low speeds and allows to place the tori 2 arbitrarily close to each other.

subject matter

The angle-code converter containing a stator, in which four ferrite tori with reading and excitation windings are installed at an angle of 90 ° to each other, a rotor with three magnets arranged at an angle of 120 ° to each other, and a power supply for the excitation windings, characterized in that In order to increase the reliability of the converter, a trigger and phase-sensitive unit are installed in it, the first input of which is connected to series-connected excitation windings, and the second one is connected to series-connected reading windings, The trigger and zero inputs of the trigger are connected to the first and second outputs of the phase-sensitive unit, respectively.