SU585452A1

SU585452A1 - Contactless ac measuring bridge

Info

Publication number: SU585452A1
Application number: SU752309830A
Authority: SU
Inventors: Фуат Шарифулович Муфазалов; Рашит Вадутович Ахмадеев; Андрей Михайлович Пугин
Original assignee: Уфимский авиационный институт им. Орджоникидзе
Priority date: 1975-12-29
Filing date: 1975-12-29
Publication date: 1977-12-25

Description

Изобретение относитс к области электроизмерительной техники и может быть использовано дл измерений механических напр жений, температур и т.п. на вращающихс детал х.The invention relates to the field of electrical measuring equipment and can be used to measure mechanical stresses, temperatures, etc. on rotating parts.

Известны измерительные мосты, содержащие трансформатор индуктивной св зи, резистивные датчики балансировочные резисторы и балансировочный конденсатор и измерительный прибор, включенный в измерительную диагональ моста 1.Known measuring bridges containing an inductive coupling transformer, resistive sensors, balancing resistors and a balancing capacitor, and a measuring device included in the measuring diagonal of the bridge 1.

Однако необходимость креплени на вращающиес детали бсшансировочных резисторов и емкости, сложность точной сборки и установки на вращающейс детали двух трансформаторов и многоэлементность конструкции снижает надежность и повышает стоимость всего устройства.However, the need to attach bussing resistors and capacitance to rotating parts, the complexity of accurately assembling and installing two transformers on a rotating part, and the multi-element design reduces reliability and increases the cost of the entire device.

Целью изобретени вл етс упрощецие технологии сборки.The aim of the invention is to simplify the assembly technology.

Это достигаетс тем, что в бесконтактный измерительный мост переменного тока, содержаидий трансформатор индуктивной св зи, резистивные датчики , балансировочные резисторы и балансировочный конденсатор и измерительный прибор, включенный в измерительную диагональ моста, введены четыре диода, при этом два плеча моста образованы резистивньами датчикам, подключенными через диоды параллельно вторичной обмотке трансформатора индуктивной св зи и установленными на вращающейс детали, и двум первичными обмотками трансформатора индуктивной св зи с двум другими диодами , установленными на неподвижнойThis is achieved by including four diodes in the non-contact measuring AC bridge, an inductive communication transformer, resistive sensors, balancing resistors and a balancing capacitor and a measuring device included in the measuring diagonal of the bridge; through diodes parallel to the secondary winding of the inductive coupling transformer and mounted on the rotating part, and the two primary windings of the transformer inductive implicit communication with two other diodes mounted on the fixed

детали, a два плеча моста образованы посто нными резисторами и одним балансировочным резистором, причем другой балансировочный резистор подключен к источнику питани ,details, a two arms of the bridge are formed by constant resistors and one balancing resistor, with the other balancing resistor connected to a power source,

a бгшансировочный конденсатор соединен с балансировочным резистором и одной из вершин измерительной диагоиали .A bsanging capacitor is connected to a balancing resistor and one of the peaks of the measuring diagonal.

На чертеже приведена схема бесконтактного измерительного моста.The drawing shows a diagram of a contactless measuring bridge.

Предлагаемый мост состоит из логометра 1, включенного в измерительную диагональ моста. Два плеча моста образованы резистивными датчиками 2The proposed bridge consists of a logometer 1 included in the measuring diagonal of the bridge. The two arms of the bridge are formed by resistive sensors 2

и 3, подключенными через диоды 4 и 5 параллельно вторичной обмотке 6 трансформатора индуктивной св зи 7 и установленными на вращающейс детали и двум первичными обмотками 8 и 9and 3, connected via diodes 4 and 5 in parallel to the secondary winding 6 of the inductive coupling transformer 7 and mounted on the rotating part and the two primary windings 8 and 9

Claims

an inductive coupling transformer with two other diodes. 10 and llj installed on a fixed part. The other two bridge arms are formed by constant resistors 12 and 13, one balancing resistor 14, the other balancing resistor 15 is connected to a power source and the balancing capacitor 16 is connected to it and to one of the vertices of the measuring diagonal of the bridge. When the bridge is powered by an alternating current source, a positive half-cycle current flows through the diode 10, the stationary primary winding 8 of the transformer 7, the corresponding winding of the logometer 1, the resistor 13, and the emf is induced. in the rotating secondary winding b of the transformer 7, under the action of which a current flows through the diode 11, the stationary pepper winding 9 of the transformer 7, the corresponding logometer winding, resistors 12 and 14. In this case, in the secondary rotating winding 6 the opposite of that induced in the positive half-diode. There is a current flowing through the diode 4 and a resistive sensor.

2. If the currents in the first and in the second half of the period through the windings of the meter are equal, then they create equal and oppositely directed logometers. When the resistance of the resistive sensors 2 and 3 changes, the currents flowing through the windings of the meter and the moments generated by these currents and acting on the moving part of the meter will change accordingly, as a result of which the readings will be non-zero. The readings of the logometer will be proportional to the difference in resistance of the resistance sensors 2 and

3. Resistor 14 serves for amplitude balancing of the bridge, resistor 15 and capacitor 16 for phase balancing. In the proposed bridge design, the number of parts attached to the rotating part is reduced; inductive coupling is performed by one transformer instead of two, which improves the accuracy and reliability of the bridge, the arrangement of circuit elements on the fixed part allows them to be chosen in terms of dimensions and other characteristics. All this allows to reduce the cost of manufacturing, simplify the assembly of the bridge and its adjustment. A non-contact AC measuring bridge comprising an inductive coupling transformer, resistive sensors, balancing resistors, a balancing capacitor, and a measuring device included in the measuring diagonal of the bridge, differing in that, in order to simplify the assembly technology, four diodes are inserted into it, This two terminals are formed by resistive sensors connected through diodes parallel to the secondary winding of an inductive coupling transformer and mounted on rotating parts whether, and the two primary windings of the inductive coupling transformer with two other Diodes mounted on the fixed part, and the other two arms of the bridge are formed by constant resistors and one balancing resistor, the other balancing resistor is connected to the power supply, and the balancing capacitor is connected to the balancing a resistor and one of the vertices of the measuring diagonal. Sources of information taken into consideration during the examination: 1. V. I. Chevkinov. and Vaisman M.I. Research work contactless induction current collector, Automotive industry number 1, 1964, p.28.

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