SU974273A1

SU974273A1 - Rotation speed converter

Info

Publication number: SU974273A1
Application number: SU813286588A
Authority: SU
Inventors: Серафим Иванович Кирпатовский; Светлана Владимировна Семенова; Евгений Николаевич Петров; Виктор Иванович Руденко; Василий Иосифович Чабан
Original assignee: Львовский Ордена Ленина Политехнический Институт Им.Ленинского Комсомола
Priority date: 1981-05-04
Filing date: 1981-05-04
Publication date: 1982-11-15

Description

Изобретение относится к приборов (строению и может быть использовано для измерения скорости вращения валов различных устройств.The invention relates to devices (structure and can be used to measure the speed of rotation of the shafts of various devices.

В технике измерения угловой скорости валов различных устройств широкое ⁵применение находят преобразователи частоты вращения, содержащие ферромагнитный зубчатый диск, магнитопровод с сигнальными обмотками и постоянный маг.10 нит, установленный на магнитопроводе [1 ].In the technique of measuring the angular velocity of shafts of various devices, ⁵ speed converters containing a ferromagnetic gear disk, a magnetic circuit with signal windings and a permanent magnet of 10 nits mounted on the magnetic circuit [5] are widely used.

Недостатком данных устройств является ограниченная точность преобразования, связанная с тем, что получаемый^ информационный сигнал не является синусоидальным, т. е. кроме основной гармоники содержит большое количество четных и нечетных гармоник.The disadvantage of these devices is the limited accuracy of the conversion, due to the fact that the received information signal is not sinusoidal, i.e., in addition to the main harmonic, it contains a large number of even and odd harmonics.

Наиболее близким по технической сущности к предлагаемому является преобразователь частоты вращения, содержащий ферромагнитный зубчатый диск, два П-образных магнитопровода, на каж2The closest in technical essence to the proposed one is a speed converter containing a ferromagnetic gear disk, two U-shaped magnetic cores, each

Дом стержне которых расположены сигнальные обмотки, и_хпостоянный магнит, установленный между спинками магнитопроводов, при этом расстояние между стержнями каждого магуитопровода рав? но половине шага зубцов диска и обмотки каждого магнитопровода соединены последовательно-встречно [2].The house is the core of which the signal windings are located, and _{x is a} permanent magnet installed between the backs of the magnetic cores, while the distance between the rods of each magnetic circuit is equal to? but half the pitch of the teeth of the disk and the windings of each magnetic circuit are connected sequentially in the opposite direction [2].

Смещение стержней на половину шага зубцов диска позволяет исключить из информационного сигнала все четны? гармоники, однако наличие нечетных и в первую очередь третьей гармоники существенно ограничивает точность преобразования .The shift of the rods by half a step of the teeth of the disk allows you to exclude all evens from the information signal? harmonics, however, the presence of odd and primarily third harmonics significantly limits the accuracy of the conversion.

Цель изобретения - повышение точности.The purpose of the invention is improving accuracy.

Поставленная цель достигается тем, что у преобразователя частоты враще20 ния, содержащего ферромагнитный зубчатый диск, два П-образных магнитопровода, на каждом стержне которых расположены сигнальные обмотки, и постоянный магнит, установленный между спи нками магнитопроводов, при этом расстояние между стержнями каждого Mai— нитопровода равно половине шага зубцов диска и обмотки каждого магнитопровода соединены последовательно- 5 встречно, магнитопроводы смещены друг' относительно друга· в направлении, параллельном плоскости вращения диска, на 1/6 шага зубцов диска, а их обмотки соединены между собой последовате- 10 льно-согласно.This goal is achieved by the fact that a speed converter containing a ferromagnetic gear disk has two U-shaped magnetic cores with signal windings on each rod and a permanent magnet installed between the backs of the magnetic cores, with the distance between the rods of each Mai equal to half the pitch of the teeth of the disk and the windings of each magnetic circuit are connected in series-5 counter, the magnetic circuits are displaced 'relative to each other in a direction parallel to the plane of rotation d lawsuit, at 1/6 of the pitch of the disc teeth, and their windings are connected to each other sequentially 10 according to each other.

, На чертеже изображен предлагаемый преобразователь частоты вращения, общий вид., The drawing shows the proposed speed converter, General view.

Индуктором преобразователя частоты 15 вращения служит ферромагнитный зубчатый диск 1. Статор'преобразователя со-¹держит высококоэрцитивный постоянный магнит 2, два П-образных шихтованных магнитопровода, на стержнях 3“6 кото- 20 рых находятся измерительные катушки . 7-Ю.A ferromagnetic gear disk 1 serves as the inductor of the rotation frequency converter 15. The stator of the converter ¹ contains a highly coercive permanent magnet 2, two U-shaped charge magnetic cores, on the rods 3–6 of which there are 20 measuring coils. 7th

Преобразователь частоты вращения работает следующим образом.The speed converter operates as follows.

При вращении ферромагнитного зуб- 25 чатого диска 1 изменяется магнитная проводимость рабочих воздушных зазоров, что приводит к модуляции магнитного потока и, согласно закону электромагнитной индукции, наведению ЭДС ₃₀в измерительных катушках 710. Интенсивное перераспределение потока происходит в стержнях 3“6 магнитопроводов, а результирующий магнитный поток постоянного магнита 2 остается практически неизменным. Вследствие отсутствия вихревых токов в постоянном магните 2 не допускается ослабление рабочего магнитного потока по этой причине. Стержень 3 П-образного магнито- ._ппровода смещен по отношению к стержню 4 магнитопровода на половину шага зубчатого диска, а расположенные на них измерительные катушки 7 и 8 соединены последовательно-встречно. За счет этого в наведенной ЭДС нечетные гармоники удваиваются, а четные уничтожаются. Аналогично для второго П-об разного магнитопровода, содержащего стержни 5 и 6 и измерительные катушки 9 и 10. Стержень 5 второго магнитопровода смещен относительно стержня 3 первого магнитопровода на 1/6 шага зубчатого диска, и стержень 6 смещен относительно стержня 4 на 1/6 шага зубчатого диска. При последовательном согласном соединении концов измерительных катушек 8 и 9 происходит сложение наводимых ЭДС, в результате которого уничтожаются третьи гармоники, а первые складываются.When the ferromagnetic tooth disk 25 is rotated, the magnetic conductivity of the working air gaps changes, which leads to modulation of the magnetic flux and, according to the law of electromagnetic induction, induction of the EMF ₃₀ in the measuring coils 710. An intensive redistribution of the flux occurs in the rods of 3–6 magnetic circuits, and the resulting the magnetic flux of the permanent magnet 2 remains virtually unchanged. Due to the absence of eddy currents in the permanent magnet 2, weakening of the working magnetic flux is not allowed for this reason. Rod 3 of the U-shaped magneto. _The wire _{n is} offset with respect to the core 4 of the magnetic circuit by half a step of the gear disc, and the measuring coils 7 and 8 located on them are connected in series with each other. Due to this, in the induced EMF, the odd harmonics are doubled, and the even ones are destroyed. Similarly, for the second U-shaped magnetic circuit, containing rods 5 and 6 and measuring coils 9 and 10. The rod 5 of the second magnetic circuit is shifted relative to the rod 3 of the first magnetic circuit by 1/6 of the pitch of the gear disc, and the rod 6 is shifted relative to the rod 4 by 1/6 gear pitch. With a sequential consonant connection of the ends of the measuring coils 8 and 9, the induced EMF is added, as a result of which the third harmonics are destroyed, and the first ones are added.

На выходе преобразователя'действует ЭДС значительной амплитуды практически неискаженной синусоидальной формы', ·поскольку пятая и последующие нечетные гармоники весьма малы, что позволяет существенно повысить точность.At the output of the converter, there is an emf of significant amplitude of practically undistorted sinusoidal shape ', since the fifth and subsequent odd harmonics are very small, which can significantly increase the accuracy.

Claims

The invention relates to an instrumentation structure and can be used to measure the rotational speed of aal of various devices. In the technique of measuring the angular velocity of shafts of various devices, rotational frequency converters containing a ferromagnetic toothed disk, a magnetic circuit with signal windings and a constant magnetic circuit are widely used. The magnet mounted on the magnetically d. The disadvantage of these devices is the limited conversion accuracy, due to the fact that the received information signal is not sinusoidal, i.e., besides the main harmonic, it contains a large number of even and odd harmonics. The closest in technical essence to the present invention is a rotational frequency converter comprising a ferromagnetic toothed disk, two U-shaped magnetic circuits, on each house of which there are sigmale windings, an inconstant magnet installed between the backs of the magnetic cores, while the distance between the rods MI of each magnet is equal to half the pitch of the teeth of the disk and the windings of each magnetic circuit are connected in series-counter 2}. Shifting the rods by half the pitch of the teeth of the disk allows to exclude all even harmonics from the information signal, but the presence of odd and first of all third harmonics significantly limits the accuracy of the conversion. The purpose of the invention is to improve accuracy. The goal is achieved by the fact that the rotational frequency converter, containing a ferromagnetic gear disk, has two U-shaped magnetic cores, on each rod of which signal windings are located, and a permanent magnet installed between the spins of the magnetic cores, while the distance between the terminals of each magnetic core equal to half the pitch of the teeth of the disk and the windings of each magnetic core are connected sequentially all the way round, the magnetic cores are offset from each other in a direction parallel to the plane of rotation disc, 1/6 pitch teeth of the disc, and their windings are interconnected in series-according. The drawing shows the proposed rotational speed converter, a general view. The inductor of the frequency converter is a ferromagnetic gear disk T. The stator converter contains a highly coercive permanent magnet 2, two U-shaped laminated magnetic cores, on the rods x 3-6 of which there are measuring coils 7-10. ,, The frequency converter operates as follows. When the ferromagnetic gear disk 1 rotates, the magnetic conductivity of the working air gaps changes, which leads to modulation of the magnetic flux and, according to the law of electromagnetic induction, induction of EMF in the measuring coils 7-10. Intensive redistribution of the flux occurs in the BZ of the magnetic cores, and the resulting magnetic flux of the permanent magnet 2 remains almost unchanged. Due to the absence of eddy currents in the permanent magnet 2, the working magnetic flux is not attenuated for this reason. The core 3 of the U-shaped magnetic circuit is displaced with respect to the core f of the magnetic circuit by half the pitch of the toothed disk, and the measuring coils 7 and 8 located on them are connected in series and counter. Due to this, the 8 induced emf odd harmonics are doubled, and even ones are destroyed. Similarly, for the second P-about different magnetic circuit containing the rods 5 and 6 and the measuring coils 9 and 10. The rod 5 of the second magnetic conductor is shifted relative to the rod 3 of the first magnetic conductor by 1/6 of the pitch of the toothed disk, and the rod 6 is shifted relative to the rod C by 1/6 pitch gear disk. With a consistent consonant connection of the ends of the measuring coils 8 and 9, the induced EMF is added, resulting in the destruction of the third harmonics and the first ones being folded. allows to significantly increase the accuracy. The invention includes a frequency converter comprising a ferromagnetic toothed disk, two U-shaped magnetic cores with signal windings on each rod, and a permanent magnet mounted between the backs of the magnetic cores, with the distance between the cores of each magnetic core equal to half the tooth pitch of the disk and The windings of each magnetic circuit are connected in series to each other, about tl and due to the fact that, in order to increase accuracy, the magnetic cores are shifted relative to each other in a direction parallel to flax disk rotation plane at 1/6 pitch drive teeth, and their windings are connected together in series, according to. Sources of information taken into account in the examination 1, USSR Author's Certificate No. 669290, cl. G 01 R, 1976.

2. US patent number 39179E7, cl. G 01 R, 1975 (prototype).