SU571857A1

SU571857A1 - Contactless angle converter

Info

Publication number: SU571857A1
Application number: SU7602315035A
Authority: SU
Inventors: Мячеслав Иванович Смирнов; Ирина Александровна Бережнова; Юрий Петрович Перфильев
Original assignee: Предприятие П/Я А-3697
Priority date: 1976-01-12
Filing date: 1976-01-12
Publication date: 1977-09-05

Description

(54) БЕСКОНТАКТНЫЙ ПРЕОБРАЗОВАТЕЛЬ УГЛА(54) CONTACTLESS ANGLE CONVERTER

1one

Изобретение относитс к области автоматики и вычислительной техники и предназначено дл преобразовани угла поворота вала в последовательность импульсов, число которых пропорционально углу поворота.The invention relates to the field of automation and computer technology and is intended to convert the angle of rotation of the shaft into a sequence of pulses, the number of which is proportional to the angle of rotation.

Известны индукционные преобразователи угла поворота вала в последовательность электрических импульсов, число которых пропорционсшьно углу поворота . Известные преобразователи содержат статор и ротор, выполненные шихтованными из пластин магнитом гког материала. Ротор по внешней образующей снабжен зубцами. Статор выполнен с вно выраженными полюсдАШ. На восьм полюсах статора выполнены зубцы, аналогичные ротору. Шаг зубцов соседних полюсов смещен на 1/2 зубцового делеНИН . На двух взаимно противоположных полюсах статора (без зубцов) расположены обмотки возбуждени , соединенные между собой последовательно-согласно, на остальных полюсах статора разметщены обмотки считывани , соединенные через одну последовательно-встречно Known induction converters angle of rotation of the shaft in a sequence of electrical pulses, the number of which is proportional to the angle of rotation. Known transducers contain a stator and a rotor made of magnetically hog material laminated from the plates. The rotor on the outer generatrix is provided with teeth. The stator is made with pronounced poledash. At the eight poles of the stator are made teeth, similar to the rotor. The pitch of the teeth of the adjacent poles is shifted by 1/2 of the crown delineate. At the two mutually opposite poles of the stator (without teeth) are located the excitation windings connected to each other in a series-consistent manner; on the other poles of the stator, the read windings are connected, connected through one series-opposite

Известны также преобразователи угла, магнитопроводы статора и ротора которых выполнены шихтован)Лми, не сущими обмотки с различными числами пар полюсов 2.Angle transducers are also known, the stator and rotor magnetic cores of which are made of laminated) Lmi, non-existent windings with different numbers of pairs of poles 2.

Известные преобразователи имеют низкую точность преобразовани информации из-за наличи технологических погрешностей и эксцентриситета. Разрешающа способность известных преобразователей также невелика и определ етс величиной зубца, которую в шихтованных магнитопроводах ие удаетс выполнить достаточно малой.Known converters have low accuracy of information conversion due to the presence of technological errors and eccentricity. The resolution of the known transducers is also small and is determined by the size of the tooth, which in the laminated magnetic cores can not be performed sufficiently small.

Кроме того, известен преобразователь угол-код, который содержит статор с обмотками возбуждени и считывани , магнитопровод которого выполнен в виде П-образных ферромагнитных пластин, и безобмоточный ротор, маг«итопровод которого выполнен в виде пр моугольных пластин З.In addition, an angle-code converter is known which contains a stator with excitation and reading windings, the magnetic circuit of which is made in the form of U-shaped ferromagnetic plates, and a non-winding rotor, the magnets of which are made in the form of rectangular plates Z.

Данное устройство вл етс наиболе Близким к изобретению по технической сущности и достигаемому результату.This device is the most Close to the invention in its technical essence and the achieved result.

Claims

In such a transducer, technological errors in the manufacture of individual elements influence the accuracy of converting the angle into an electrical signal. This is due to the fact that the individual plates of the stator magnetic circuit are grouped into poles on which the reading and ampoules are placed, and therefore at the same time a limited number of rotor magnetic core plates are involved in forming the output signal of the converter. In addition, the discrete arrangement of the stator poles eliminates the possibility of using the effect of circular averaging errors. Therefore, the rotor eccentricity relative to the stator has a great influence on the conversion accuracy. The aim of the invention is to improve the accuracy of the conversion. This is achieved by the fact that in a contactless transducer containing a stator with reading and excitation windings, the magnetic circuit is made in the form of U-shaped ferromagnetic plates, the rotor whose magnetic circuit is made in the form of rectangular plates, the ferromagnetic plates of the rotor and stator are laid evenly around the circumference, the plates on the stator are made of different heights, arranged in alternating sequences with a step equal to 1, 5 Gy, and each of these windings is composed of two concentric sections, one of which is This is covered by all U-shaped plates of the stator, and the other - by plates of greater height, where Tp is the pitch of the rotor plates. FIG. 1 shows a contactless angle converter; in fig. 2 is a section along A-A in FIG. 1. Angle converter contains one hundred torus 1 and rotor

2. The rotor is an annular structure made of a non-magnetic material, the outer core of which is evenly arranged with a predetermined pitch magnetic plates of a ferromagnetic material.

3. The stator is also made annular from a non-magnetic material, along the internal generator of which is uniformly with a step equal to 1.5 Tr, where Tr is the pitch of the rotor plates, there are P-o different plates 4 and 5, made of a ferromagnetic material. The plates 4 and 5 of the stator magnetic circuit are made of different lengths and are arranged in alternating sequence. The excitation windings 6 and readings 7 have an annular shape and are concentric with the axis of rotation of the rotor and each of them is composed of two sections. One section of each winding is covered by plates 4 and 5, and the other section of windings is covered by only plate 5, which have greater heights. The angle converter is a transformer device with variable transformation ratio. Ratio;.; The transient transformation can vary from some minimum to some maximum value depending on the relative position of the rotor and stator magnetic circuit. The magnetic flux arising in the converter when the excitation windings are supplied with a variable frequency current is distributed over the magnetic core plates in proportion to the conductivities of the magnetic circuit. Since the pitch of the rotor plates is one and a half times smaller than the pitch of the stator plates, when the rotor plates coincide, for example, with the short stator plates 4, the stator plates 5 are in the middle of the gap between the rotor plates. In this case, the conductivity of the magnetic circuit: the rotor-plate 4 is maximum, and the EMF induced in the section of the read winding passing through these plates is maximum. The conductivity of the magnetic circuit: the rotor-plate 5 is minimal, and the EMF induced in the readout winding section enclosed by the plates 5 is minimal. Since the readout winding sections are connected in series with each other, a signal appears at the output of the converter, the value of which is equal to the difference in emf induced in the readout winding sections. When the rotor is rotated 1/4 of a step from the previous position, the conductivities of the magnetic circuits will be the same, the emf induced in each winding of the readout will be equal, and the total voltage of the output signal will be zero. Thus, when the rotor rotates, the EMF / periodically changes from zero to a maximum value of 2n times per rotor, where n is the number of rotor plates. The signal at the output of the converter has the form of balanced-modulated oscillations with a carrier frequency equal to the excitation frequency of the converter and with an envelope frequency proportional to the product of the rotor speed and the number of its teeth. The output bend varies sinely with the angle of rotation of the rotor relative to the stator. Due to the effect of circular averaging errors, the influence of technological errors in the manufacture of individual parts and the rotor centricity relative to the stator on the accuracy of converting the angle of rotation of the shaft into an electrical signal is reduced, which in turn leads to an increase in the accuracy of the device and resolution. Claims of the Contactless Angle Converter Containing a Stator with Winding Excitation