SU1206634A1 - Magnetoelastic torque converter - Google Patents

Description

The invention relates to a load measuring technique and can be used to measure the torque transmitted by a rotating shaft.

The purpose of the invention is to improve the accuracy by obtaining a phase-modulated output signal.

FIG. 1 shows the structural scheme of the proposed Converter; in fig. 2 - ring section; in fig. 3 - functional converter circuit; in fig. 4 - graphs explaining the principle of operation of the device.

. Magnetic torque converter contains shaft 1 in the form of a closed magnetic circuit with V-shaped sections 2 sensitive to deformation and with vertices 3, a stator consisting of two axial rings 4 and 5 with internal radial projections 6, coils 7 and 8, respectively, magnetization and measurement, non-ferromagnetic cylindrical base 9 with protrusions 10, phase-shifting circuit 11, null-bodies

12 and 13, an EXCLUSIVE or 14 logical element, a differentiating circuit 15 and a synchronous trigger 16.

Ring 4 consists of ring portions 17 installed between the projections 10 of the non-ferromagnetic cylindrical base 9.

The rings 4 and 5 are fixed at the ends of the non-ferromagnetic hollow cylindrical base so that the planes passing through the axis of rotation of the shaft and the centers of the projections of one ring are divided into two equal parts between the projections of the other ring.

The magnetizing coils 7 are located on the ring sections 5 around the circumference of the ring and are interconnected through one with the formation of two branches of the magnetization winding. One branch is connected to the alternating voltage source directly, and the other via the phase-shifting circuit 11.

The measuring coils are located on the radial protrusions of the ring 5 and are interconnected in series. At the output of the measuring coils connected null-body 12. Null-body

13connected to the magnetize winding. Null Organ Output 12

and 13 arrive at the inputs of the logical element EXCLUSIVE OR 14. The output signal of the zero-organ 1 2 after diff 1202034

the differentiation circuit 15 is fed to the synchronization input of the trigger 16. The information input of the trigger 16 is supplied, the output voltage of the logic element of the SUCKETTING OR 14. The output

ten

15

20

momentum g. is used as a reference pulse against which the phase shift of the output signal is measured.

The plots (Fig. 4) show the magneto-motive forces RD, F of the magnetizing winding branches; magnetic flux components - o ,, flowing through the core of the measuring coil in the absence of torque; components of the magnetic flux p, V; flowing (through the core of the measuring coil under the action of torque, output (reference) pulses and “D zero-organ 12, output pulses UKQ ,, zero-organ 13, output pulses CD, logic element, 25 output pulses of the differentiating circuit 15, output pulses of the output converters, the duration KOTopbDt is equal to the phase shift Зр between pulses, when P 0 (reference ) O P, the voltage U at the output of the flip-flop defining the sign of torque.

The Converter operates as follows.

In the absence of torque (), when the points a, b, c, d, e are under the protrusions of the stator and torus rings (Fig. 2), the magneto-motive forces Rd and P / U2 create magnetic flux through the core portion of the measuring coil ( Fig. 2). This flux contains two components (Fig. 4). The resulting magnetic flux through the region de is determined by the difference 9d and Φ.

At the moment cot, when F.

thirty

35

40

45

50

55

 W1

 F

Mz

the magnetic fluxes f, and f are equal, the magnetic flux through the core of the measuring coil is zero. At this moment, the zero organs at the outputs give out pulses U „Q, and (Fig. 4), the phase shift between which is zero. Starting voltage

 you are X - l o.

Under the action of the torque (Mt O), the magnetic permeability of the V-shafts of the shaft changes, and in the directions in which the | shaft experiences compression deformation

five

0

momentum g. is used as a reference pulse against which the phase shift of the output signal is measured.

The plots (Fig. 4) show the magneto-motive forces RD, F of the magnetizing winding branches; magnetic flux components - o ,, flowing through the core of the measuring coil in the absence of torque; components of the magnetic flux p, V; flowing (through the core of the measuring coil under the action of torque, output (reference) pulses and “D zero-organ 12, output pulses UKQ ,, null-organ 13, output pulses CD, logic element, 5 output pulses of the differentiating circuit 15, output pulses of the output converters, duration KOTopbDt is equal to the phase shift Зр between pulses, when P 0 (reference ) and P 0 is the voltage U at the output of the trigger, which determines the sign of the torque.

The Converter operates as follows.

In the absence of torque (), when the points a, b, c, d, e are under the protrusions of the stator and torus rings (Fig. 2), the magneto-motive forces Rd and P / U2 create magnetic flux through the core portion of the measuring coil ( Fig. 2). This flux contains two components (Fig. 4). The resulting magnetic flux through the region de is determined by the difference 9d and Φ.

At the moment cot, when F.

0

five

0

five

0

five

 W1

 F

Mz

the magnetic fluxes f, and f are equal, the magnetic flux through the core of the measuring coil is zero. At this moment, the zero organs at the outputs give out pulses U „Q, and (Fig. 4), the phase shift between which is zero. Starting voltage

 you are X - l o.

Under the action of the torque (Mt O), the magnetic permeability of the V-shafts of the shaft changes, and in the directions in which the | shaft experiences compression deformation

(areas bd and ce), the magnetic permeability decreases, and in the directions of deformation, the tension increases (areas ad and be). The magnetic resistances of the bd and ce sections increase, while the ad and be sections decrease. As a result, the traffic flux F ,,, increases, and Fo2 decreases (Fig. 4). In this case, the resulting magnetic fioTOK becomes equal to zero in the mono-KeHTCOtj and at the output of the zero-organ 13 a pulse and (02 appears at the moment of Cdt. At the output of the logic element, pulses are U ,,, CD. Whose duration is equal to (, { fp. The output pulse phase is equal to tfp, the greater the torque, the greater the tfp. At the same time, at the moment k) t, the signal LF jy arrives at 06634

The trigger input is set to 16. A trigger signal is received at the trigger trigger input. In the trigger, information 5 is recorded and, and (FIG. 4), is equal to one. This means that the sign of the torque is positive.

The remaining sections of the magnetic circuit work in a similar way.

When the sign of the torque changes by 180 °, the phase of the magnetic flux flowing through the core of the measuring coil changes. In this case, the output of the logical

signal element .., get in

moments cot ,,. impulses su

Weekend duration

 H,

A zero signal is set at the trigger output. This means that the torque sign is negative.

0ati

Claims (1)

MAGNETOELASTIC TORQUE CONVERTER comprising a shaft. in the form of a closed magnetic circuit with coaxial V-shaped sections located on different planes, an annular stator in the form of two coaxial rings with radial internal protrusions in an amount equal to the number of shaft vertices located at the ends of the hollow cylindrical non-ferromagnetic base so that the planes passing through the axis of rotation of the shaft and the centers of the protrusions of one ring are divided into two equal parts between the protrusions of the other ring, and the magnetization and measurement windings, characterized in that, in order to increase the accuracy STI by obtaining the phase-modulated output signal is provided with a measuring circuit consisting of two zero-bodies, the exclusive OR logic element and a synchronous trigger and a stator is assembled from ring portions disposed between the inner lugs nefer-. the magnetic base, the magnetization coils are installed around the circumference and are interconnected through one with the formation of two magnetization windings, one of which is connected directly to the AC voltage source, and the other through a phase-shifting circuit, the first zero-organ connected to the magnetization windings, the second to the winding measurements, and their outputs - to the inputs of the logic element, the output of which is connected to the information input of the trigger, the synchronizing input of which is connected to the output through a differentiating circuit m of the first ^ null organ. SU _(I , 1206634