SU385305A1 - BEMELIOTEKL A. P. Shpiny - Google Patents

Description

one

The invention relates to the field of computing technology and can be used to enter the angular information into the computer.

The known cyclic transducer of the ANGULAR position of the shaft in the time interval is a fixed ring-shaped acoustic conductor of a magnetoelastic (magnetostrictive) material. In the center of the sound duct there is an input shaft with which a matching magnetic head is rigidly connected. An electroacoustic converter, made in the form of a piezoceramics or quartz plate attached to the end of the sound guide, is used as a recording element.

A disadvantage of the known device is the cumbersome duct, the cross section of which cannot be reduced when using a piezoelectric transducer with a given radiation area. In addition, in the prior art, precision machining of the end surface of the duct is required, which creates certain technological difficulties.

The aim of the invention is to simplify the design and reduce the weight of the device. This goal is achieved by the fact that in the proposed transducer a magnetostrictive transducer in the form of a magnetic head is used as a recording element.

An annular sound duct is made and a thin ribbon of magnetostriction material. The end of the sound guide is muffled (reinforced in silencers).

This allows us to know the weight of the sound cable, xak thick, and the lenses from which it is made can be several decons microns. In addition, it allows to unify the recording and reading units, which simplifies the device

FIG. 1 depicts a single channel converter; in fig. 2-channel angle converter from 0 to 360 ° in two projections.

The non-proposed transducer includes an annular duct /, made in the form of a tape of magnetostrictive material. In the center of the semiring formed by the sump, there is an input wave 2, the position angle of which is converted into a time interval. A reading magnetic head 3 is rigidly connected with the shaft 2, which is turned by a working gap to the side surface of the acoustic duct. A recording magnetic head 4 is installed at one of the ends of the sound duct, which is enclosed in the screen 5 and connected to the pulse generator 6. In order to ensure a minimum level of reflected signals, the ends of the sound duct are clamped in silencers 7,

As can be seen from FIG. 1, this type of converter does not allow converting the angles of rotation of the shaft, the magnitude of which is greater than a certain value of the angle max (in Fig. 1 the dotted line shows the bend of the sound duct for this angle). For cases of angle conversion (Rotation, large "max ranging from 0 to 360 °), two identical conversion channels are used.

In the device shown in FIG. 2, two sound ducts 1, bent in the form of half-rings, whose geometric centers are mutually mixed, are used. Sound lines are installed one above the other and deployed so that they form a closed ring. In the center of the ring formed by the sound ducts, there is an input your 2, with which a two-channel reading magnetic head 3 is rigidly connected, which represents two independent heads combined in one housing and one above the other. A recording magnetic head 4 is placed at one end of each sound duct, placed in screen 5. The heads 4 are connected in parallel to the pulse generator 6. The ends of both sound ducts are fixed in the silencer 7.

Consider the operation of a single-channel converter (Fig. 1).

When a recording magnetic head 4 arrives in the winding from a generator 6 in the acoustic duct, a mechanical voltage is generated near the working gap of the head 4 due to the direct magnetostrictive effect. A wave of mechanical voltage, propagating along a conduit with a constant Speed, passes by the working gap: reading magnetic head 3. At this moment, due to the reverse magnetostrictive effect (magnetoelastic effect), an electrical voltage pulse (stop pulse) appears on the "lemmas of head 3" . The temporal position of which determines the angular position of the shaft 2. Indeed, the time delay of the stop pulse relative to the start pulse (generator pulse 6) is proportional to

the distance that the wave of mechanical stress travels from the field of excitation to the place of reading. Thus, the time interval between the start and stop pulses unambiguously determines the position angle of the reading head 3, and hence the shaft 2.

When converting angles from 0 to 180 °, the upper duct (see Fig. 2) with a recording head located on the left is working; in converting angles from 180 ° to 360 °, the lower duct with a recording head located on the right. It is also possible reverse arrangement e; converter converter The work of each channel

described above.

It should be noted that for higher and return levels of the reading head, the suction line must be magnetized either all or in the area of the working clearances of the heads

write and read. The magnetization of the avouprovod is created by any known method, for example, by applying direct current to the windings of the write and read heads.

Subject invention

Claims (2)

1. The cyclic transducer angle-time interval containing the duct, made in the form of a semi-ring, a recording unit connected to an oscillator generator, and a reading unit made in the form of a magnetic head mounted on the input ale, characterized in that, in order to simplify the device, the recording unit is made in the form of a magnetic head, and the sound guide is in the form of a tape of magnetostrictive material. 2. The device according to claim 1, characterized in that, in order to expand the range of angle conversion, a two-channel magnetic head is used in the readout node and an additional recording node is connected to the pulse generator and an additional sound conduit main so that both sound ducts form a ring. 0g    Start pulse Stop - impulse FIG. one