SU894347A1 - Two-channel touch-free pickup of angular displacements - Google Patents

Description

(54) TWO-CLAMP NON-CONTACT SENSOR The invention relates to automatic measurement, control, and control systems and can be used for accurate measurements of angular displacements. Angular displacement sensors are known which include ring transformers. These devices are a combination of contact sensors and ring transformers, with a separate ring transformer being provided for each individually outputting rotor winding of the contact sensor. The disadvantage of this type of device is its relatively large size due to the presence of ring transformers. Also known is a non-contact, two-fold angle-angle transducer, which is a combination of four flat rotary transformers (BT) in a single design. This converter has a single excitation circuit and two (bipolar and multipolar) output windings 2. The disadvantage of this converter, despite the relatively high accuracy of the ANGULAR DISPLACEMENT, is the large axial dimensions. The closest to the invention is a two-channel non-contact angular displacement sensor containing rotor and stator batch magnetic conductors and three groups of quadrature windings with pole pairs n, m and n ± 1, where pit are any integers, of which quadrature windings with numbers and pairs the poles n, which are the excitation windings, are placed on one of the packages of the stator and rotor magnetic cores 3. The disadvantage of this sensor is its relatively large axial dimensions due to the presence of three pairs of packages of stator and rotor magnetic cores placed along the axial length of the sensor. The purpose of the invention is to reduce the size of the sensor. This goal is achieved because the rotor and stator magnetic cores are double-packaged, the rotor and stator windings with numbers of pole pairs of type ± 1 are placed in the second of the rotor and stator magnetic circuit packages, respectively, and the numbers m and n ± 1 have no common factors.

FIG. 1 shows the sensor obiy view, section; in fig. 2 is a diagram of the connection of its windings.

In case 1 of a two-channel sensor, there is a stator magnetic circuit containing packages 2 and 3 and a rotor magnetic circuit with packages 4 and 5.

On the package 2 of the stator magnetic circuit, two input quadrature (shifted by 90 electra grades) windings b and 7, which are the excitation windings of both channels, are degraded.

Winding 6 and 7 have the number of pairs of poles n.

With a single-supply power, one of the excitation windings 6 or 7 is connected to the power supply, and the second is short-circuited, and with a two-phase (phase shifter mode) windings are connected to different phases of the power supply (not shown).

On the concentrically located relative to the package 2 of the stator magnetic circuit, the package 4 of the rotor magnetic circuit placed two quadrature windings 8 and 9, having the same number of pairs of poles equal to n.

On the second packet 5 of the rotor magnetic core there are two pairs of quadrature windings 10 and 11, having n + 1 or n-1 number of pole pairs, and windings 12 and 13, having m pole pairs.

The rotor 10 and 12 of the package 5 are connected to the winding 8 of the package 4, and the windings 11 and 13 to the winding 9. At the same time, the mutual connection of the windings 10 and 12 to the winding 8 is made in a coordinated polarity, and the windings 11 and 13 to the winding 9 - in the opposite.

On the package 3 of the stator magnetic circuit placed two pairs of output windings 1 4 and 15 and 16,17.

The interconnection of the rotor windings 10 and 12 to the winding 8 in matched polarity provides an effect similar to the increase in the number of pole pairs of the package 3 stator magnetic circuit (m + n), due to which proportional sin proportional stresses are applied in the output windings 16 and 17 of the stator (n + m) cos (n + m) -Y, which are accurate count signals.

The connection of the rotor windings 11 and 13, to the winding 9 in the opposite direction corresponds to the reduction of xAA. pairs of poles n - (n ± 1) ± 1, so that the output windings 14 and 15 of the stator induce voltages proportional to sine / and coso, which are coarse signals (one pair of poles).

The sensor works as follows.

When supply voltage is applied. on one of the windings of the excitation, for example 6, on the rotor windings 8 and

9, voltages are proportional to, respectively, s i p c and COS d, where ni is the angle of rotation of the rotor, measured from the position of the rotor, at which the reciprocal inductance of the current 6 and 8 is zero.

These voltages are respectively applied to the windings 10 and 12 and the windings 11 and 13 of the second stack 5 of the rotor. The voltage applied to the winding 10,

induces in the output windings 14 and 15, respectively, of the second package 3

stator voltage

)

Sih nDl-6in (ht1) m sinttot cos (The voltage applied to winding 11 will induce stator in the same output windings 14 and 15.-respectively, the voltage

0subPA-cc1c (G (± 1) AYo and

- soy Y-5 in (p fl U V o,

where oto is the angle corresponding to the position of the rotor at which the mutual induction of the windings 10 and 14 is zero.

Thus, sug / march output voltages on windings 14 and 15 of the second stator packet 3, respectively, are equal to

inhdl-6iM ((o tcosndi-cos (vitiU4, AojCOS (to / tolo

sinl1d-coi (-cosy i g (hi: -lMt o

siKtc (toto

Therefore, the windings 14 and 15 are the output quadrature windings of the coarse reference channel. I

The voltage applied to the winding 12, will induce in the output windings 16 and 17 of the stator, respectively, the voltage

S-inna-eivi (vyidl + dlo) n sin Ho (-C06 (.- oioP

The voltage applied to the winding 13 will induce in the same output windings 16 and 17, respectively, the voltage

- Cos Kiel CO6 (Wto (+01 o) M COSHot-Sfw (vno (4o (o),

55 where dip is the angle corresponding to the position of the rotor at which the mutual induction of the windings of 12 m 16 vanishes.

Thus, the total output voltages on the windings 16 and 17

will be respectively equal

SlMvid (-6in (K "ol-Mo) - 6lhho (-coe (W (+ c / o) +

-C05Y-SOB () - Y.-61I (V) J.tcAo):

i5 (Xo) -Sin (w-t-w W-i-olo

Sliders o, windings 16 and 17 are the quadrature output windings of a precision reference channel.

If, when calculating windings 10 and 12, to take the same reference point of ANGLES, then the angle will be equal to the angle olf). If the zeros are mutual induction windings 10 and 14 and windings 12 and 1 & match the position of the rotor, then with / -.

 cio Thanks to the non-multiplicity of the numbers of pairs of poles n i: 1 and m of the stator and rotor windings placed on a common magnetic circuit, in this sensor there is essentially no interaction between opposite-pole windings.

Possible parasitic interactions due to technological errors can be eliminated in the sensor by known means.

Thus, making the rotor and stator magnetic cores two-packet with the joint placement of rotor and stator windings on one of the rotor and stator magnetic circuit packages, respectively, significantly reduces the axial dimensions of the sensor,

Ostormula of invention. Two-channel contactless angular displacement sensor, containing

the rotor and stator batch magnetic cores and three groups of quadrature windings with the numbers of pole pairs n, ni and nil, where they feed any integers, of which the quadrature windings with the number of pole pairs n that are excitation windings are located on one of the stator magnet cores and rotor, characterized in that, in order to reduce the dimensions, the rotor and stator conductor are double-packaged, the rotor and stator windings with pole pairs m and n ± 1 are placed on the second of the rotor and stator magnetic cores, respectively, and m and n ± 1 not

5 have common factors.

Sources of information taken into account in the examination.

0

I

1.Pulier Yu, M, Induction electromechanical elements of computing and remote-tracking systems, m, Mashinostroenie, 1964,

c, 139,

five

2, USSR Authorship Certificate No. 393582, class, G 01 O 5/20, 1970,

3, USSR Author's Certificate No. 366345, class, G 01 B 7/00, 1970,

coso (

)

$ Ln (n4m)

 and

Claims (1)

Formula of the invention A two-channel non-contact sensor of angular displacements containing a packet magnetic circuit of the rotor and stator and three groups of quadrature windings with the number of pairs of poles n, m and nfl, * where pit are any integer numbers, of which quadrature windings with the number of 5 pairs of poles η, which are windings excitations are placed on one of the packages of the stator and rotor magnetic circuits, characterized in that, in order to reduce the dimensions, May IQ the rotor and stator conductors are double-packet, the rotor and stator windings with the number of pole pairs m and η ± 1 p zmescheny second packet of rotor cores and stator, respectively, and the numbers m and η ± 1 have no common factors.