SU652658A1 - Sine-cosine angle sensor - Google Patents

Description

The invention relates to low-power electrical manuscripts and can be used in automation systems and digital computing as a transducer of movements into an electrical signal.

A sine-cosine angle sensor is known, which contains two coaxially disposed disks on which the printed windings, arranged in the form of radial current-conducting probes, interconnected in series, are placed on the circumferential surfaces of which. On one disc, the winding conductors are made of equal length and laid in steps of 71 / Z,. On another disk, the conductors are divided into sections, the number of which is equal to N 2 (Zi-Zi). The conductors in each section are distributed with a spike, equal to 5T / 7g. Diametrically located sections of this winding are interconnected in series, forming two quadrature windings 1J.

The known sensor is closest to the invention in its technical nature and the problem to be solved.

A disadvantage of the known sensor is the presence in the sensor output of the terms depending on the high harmonics of the sensor windings, which leads to a non-sinusoidal output of the sensor, i.e., a reduction in the accuracy of the conversion of movements into an electrical signal.

The purpose of the invention is to improve accuracy by eliminating higher harmonic components from the output voltage curve of the sensor.

This goal is ensured by the fact that the conductors of each section of the quadrature windings are made of different lengths in accordance with the relation

i Uo. (Z2-Z,), where 1; - the length of a single conductor sections;

Imqx - the maximum length of the section conductor, defined by the ratio

 one;

b is the length of the conductor winding another disk;

TJI, Zi - half of the numbers of the sensor coil conductor;

 conductor number in the section, i 1,2 ..

FIG. 1 shows the construction of a single disk; in fig. 2 - construction of another disk; in fig. 3, 4 - spatial harmonic components of the output voltage of the sensor.

The sensor contains a rotor disk 1, on the surface of which a winding 2 consisting of is printed on it. 2Z | conductive radial conductors of equal length, interconnected successively in a wave pattern and distributed with a clamp equal to bjjom 7t / Z | (Fig. 1).

On the disk of the stator 3 (Fig. 2), on the surface facing the rotor winding, printed by conductors of the other winding 4. The winding is divided into sections, the number of which is N 2 (Zj-Z,). Each section contains Zil (Z), - Zj) numbers of conductors of different lengths interconnected in series. The conductors of each section are made of different lengths in accordance with the ratio:

U lmoxSin -fjZi-Z,) i.

The conductors in each section are located with a jaw equal to JL / Z. Diametrically opposed sections of the stator winding are interconnected, forming two quadrature windings - sine and cosine. The adjacent conductors of two successively located sections of each quadrature winding are offset relative to each other by an angle equal to the double angular pitch of the rotor conductors.

Due to the implementation of radial plates of a stator winding of different lengths in the spatial periodic function of current density, all spatial harmonics are limited by the cylindrical surface YOX (Fig. 3), which, at the intersection with the plane, forms the line described by the equation

U Uaxsin -J (Z2 / -Z,) iI. In this case, the graphical representation of the first (operating) low-frequency harmonic, the second, third, etc., has the form shown in FIG. 4 a, b, and the period of the first low-frequency harmonic and the repetition period of the surface (Fig. 4) are equal to each other along the OX axis.

Since the sensor output signal is equal to the sum of the terms formed when integrating all spatial harmonics

sensor within the period of the first low-frequency harmonics, then from FIG. 4 a, b, it follows that the output signal of the sensor will contain a component that depends only on the first low-frequency harmonic. The components of the output signals, depending on all the other spatial harmonics, will be zero, since the sum of the two integrals (Fig. 4a) for each of the high-frequency harmonics is within

the period of one section is zero.

Thus, by making radial plates of sections of the stator winding of different lengths, the accuracy of the sensor conversion is improved by eliminating the faults caused by the presence of higher spatial harmonics. ,

Claims (1)

1. Bychatin D. A. and others. Rotary inductosin. M.-L., “Energie, 1969, p. 7-13.