SU1499126A1 - Arrangement for contactless pickup of output signals of resistance pickups from rotatable parts of machines - Google Patents

Abstract

The invention relates to the field of electrical measuring equipment and can be used in engine building, power engineering and other branches of the national economy, where it is necessary to measure and monitor the mechanical parameters (deformations, vibrations, etc.) of rotating parts of machines. The aim of the invention is to improve measurement accuracy and reliability. The goal is achieved by introducing into the device containing a magneto-electronic power supply unit 1, a resistive sensor 2, a transformer-type transmitter current collector 3 with a rotor 4 and a stator 6 windings and a recording unit 8, a second rotor winding 5 connected in opposition to the first rotor winding 4 and having active resistance equal to the nominal resistance of the resistive sensor 2. The introduction of new elements makes it possible to achieve a better suppression of the spectrum of the rectangular voltage supply of the resistive sensor 2 and at the same time simplifies have a device. Performing the second rotor winding 5 from a wire with such a specific resistance that its total resistance is equal to the nominal resistance of the resistive sensor 2 makes it possible to reduce the dimensions of the transmitting current collector 3 of the transformer type, which increases the reliability of the device. 1 hp ff, 1 ill.

Description

The invention relates to electrical measuring technology and can be used in engine building, power engineering and other sectors of the household where it is necessary to measure and monitor the mechanical parameters (pressure, deformation, vibration, etc.) of rotating elements of machines.

The purpose of the invention is to increase measurement accuracy and reliability by better suppressing interference and simplifying the device.

The drawing shows a diagram of the device.

The device contains a magnetoelectronic memory block 1 (MEBP), a strain resistor 2, a transmitting current collector 3 with rotor 4 and 5, and a stator 6 windings, a resistor 7 (representing the active resistance of the rotor winding 5) and a recording unit 8, with the first output The UPS 1- is connected via a strain gauge 2 to the beginning of the rotor winding 4 and directly to the end of the rotor winding 5, and its second output is directly to the end of the rotor th winding 4 and through the reporter 7 to the beginning of the rotor winding 5, the outputs of the stator winding 6 of the transmitting current collector 3 connect enes to the inputs of the recording unit 8.

MEBP 1 contains a series-connected electronic unit 9 and a powering Current collector 10, the terminals of the rotor winding 11 of which are connected respectively to the first and second outputs of the MEBP 1.

The strain gauge 2, the resistor 7 and the rotor windings 4, 5 and 11 are placed on the controlled rotating part 12, and the resistances of the tensor of the resistor 2 and the resistor 7 are equal to each other.

The device works as follows.

MEBP 1 provides power to the resistor 2 with a rectangular current, p Miji,

In the absence of controlled influences on the strain gauge 2, a rectangular current flows through it and the rotor winding 4. Exactly the same form and current flows through the rotor winding 5. When the condition of equality of ampswitches is fulfilled

i, w.

i-, w

d - y

1- W and V

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 current through the strain gauge 2 and rotor winding 4; current through the rotor winding 5;

the number of turns of the rotor windings 4 and 5, respectively,

and with the specified marking of the ends of the rotor windings 4 and 5, at the output of the stator winding 6, the signal is zero due to mutual compensation of magnetic fluxes from the rotor sockets 4 5.

When a controlled parameter acts on a strain gauge 2, the latter changes its resistance, as a result of which

five

five

five

0

modulation of the apex of current pulses 0 rectangular shape. The informative component of the current closes mainly (with an appropriate choice of inductance and wire diameter of the rotor winding 5) along a contour that includes a series connection of the strain gauge 2 and the rotor windings 4 and 5. With the specified marking of these windings, they are connected in series and according to the informative component current . Due to this, the flow in the magnetic core of the transmitting current collector 3 is different from zero, and a voltage proportional to the informative component current is induced on the stator winding 6. This voltage is fed to the input of the recording unit 8, where the informative signal is amplified by voltage and power to the required value and recorded to a magnetograph or oscilloscope.

The introduction of a second rotor winding 5, made of high resistance wire, makes it possible to increase the measurement accuracy by eliminating the components of the supply square voltage and the reliability of the output signal from the spectrum of the output signal by eliminating the need to locate the electronics on the rotating part. In the proposed device, it is essential to have a resistor 7 (otherwise the output of the power supply magneto-electronic unit 1 is short-circuited). At the same time, the implementation of the second rotor winding 5 with a low impedance wire and placing an additional resistor 7 on the rotating part reduces reliability

five

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It is practically impossible with many touch controls, when the number of channels of the device reaches 80 or more, it is almost impossible due to the stringent requirements for the current collection chagti. The implementation of the second rotor winding 5 high-resistance wire does not increase the size of the transfer shop tomotkmi g prrn TpHpyi-jrai; A point, with the first gear 1 min 1 pk 1 ro 1) of the memory unit is connected to the second output via a second connected resistive sensor and the rotor winding of a transformer-type transmitting current collector, in order to

and 3, it does not reduce the reliability, accuracy of measurement and reliability, as it has a smaller mass and is more resistant to the acting linear velocities than the mounted resistor.

When using the invention from the device (a second DC amplifier with a wide bandwidth and high voltage gain is removed), the time spent on setting up and adjusting the device is reduced.

Claims (2)

Invention Formula I A device for contactless removal of the output signals of resistive sensors from rotating parts of machines contains a magnetoelectronic power supply unit consisting of a series-connected electronic unit and a transformer-type current collector, two outputs of which are connected respectively to the first and second outputs of the magnetic power supply unit, a resistor sensor, . transformer type current-carrying transmitter with rotor and stator surrounds; a second rotor winding of a transformer-type transmitting current collector is inserted in it, the terminals of which are connected to the first and second the outputs of the magnetoelectronic power supply unit so that both rotor windings of the transformer-type transmitting current collector are connected in opposite each other,  active resistance of the circuit of the second rotor winding is equal to remember; to the resistance of the resistive sensor, the findings of the stator winding of the transmitting current collector of the transformer type connected to the first and second inputs of the recording unit, 2. The device according to II. I, about tl and - with the fact that, with the purpose reducing the size of the transmitted transformer-type current collector, its second rotor winding is made of wire with such specific resistance that the total resistance of the second rotor winding is equal to the nominal resistance of the resistive sensor.