SU686051A1 - Device for remote transmission of angle - Google Patents

Description

one

The invention relates to the field of remote signal transmission using electro-magnetic converters.

Devices for remote angle transmission are known, comprising angle sensors and receivers, error signal amplifiers and measuring devices 1.

Such devices, due to the variation in the values of the minimum mismatch voltages of the electromachine sensor and the angle receiver, require individual adjustment in the tracking system. In addition, in order to provide the necessary angle transfer accuracy, it is necessary to have a high gain gain coefficient of the error signal amplifier.

The closest to the proposed is a device for remote angle transmission, comprising an angle sensor, the output of which is connected to an input of an angle receiver, a reference voltage source connected to an input of an angle sensor and an input of a shaping amplifier, an output of an angle receiver through a series-connected filter, a phase shifter and the amplifier is connected to one of the logical inputs

elements And, the output of the amplifier-shaper through a serially connected differentiating circuit and a separation diode is connected to another input of the logical element And, and through another separation diode and the inverter is connected to the second input of another logical element And 2.

The accuracy of angle transmission in this device does not depend on the magnitude of the error voltage at the output of the remote angle transmission receiver. However, due to the nonideality of the filter and phase shifter, as well as the presence of differentiating circuits, the device has a low noise immunity, which significantly limits its scope.

The aim of the invention is to improve the noise immunity of the device.

This is achieved in that a device for remote angle transmission, containing an angle sensor, the output of which is connected to the input of an angle receiver, a reference voltage source, the output of which is connected to the input of the angle sensor and the input of the first amplifier-inverter, is inserted into the second amplifier-former and

adder modulo two, the output of the angle receiver through the second amplifier-driver, and the output of the first amplifier-former is directly connected to the first and second inputs of the modulator two, the output of which is connected to the input of the inverter.

The drawing shows a functional diagram of the proposed device comprising a source of reference voltage 1, a sensor 2 and an angle receiver 3, for example, a selsyn sensor and a selsyn receiver, amplifiers-formers 4.5, a modulo two 6, an inverter 7 (XI and X2 signals at the inputs of the adder modulo 2, Y - output of the adder modulo 2).

The input of the sensor 2 is connected to the source of the reference voltage 1, the output of the sensor 24 of the sensor 2 is connected to the input of the receiver 3 of the receiver, the output of which is connected to the input of the amplifier-former 5, the input of the amplifier-former 4 is connected to the source of the reference voltage 1, the outputs the amplifiers-formers 4 and 5 are connected to the inputs of the modulo two 6, the output of which is connected to the inverter 7.

The device works as follows.

If there is a misalignment between the positions of the rotors of the selsyn-sensor 2 and the selsyn-receiver, the 3 phases of the voltages at the inputs of the amplifiers 4 and 5 coincide (for misalignment angles O-180 °) or opposite (for misalignment angles 180-360 °). Thus, at the inputs of the adder modulo two 6, impulses are produced by the shaping amplifier 4 and 5, which coincide or do not coincide in time. The signal at the output of the modulo-2 adder is determined by the following state table

XIIIOO

H21OIO

YOIIO

As can be seen from the table, the signal at the output of the modulo two adder 6 at the misalignment angles of the rotors of the selsyn-sensor 2 and the selsyn-receiver 30-180 ° is absent. Similarly, the signal at the output of the inverter 7 is absent at misalignment angles of 180-360 ° With the coordinated positions of the rotors of the resolver sensor 2 and the resolver receiver 3, the ratio of the phases of the output voltage of the resolver receiver 3 and the source of the reference voltage 1 is not a multiple. In the output voltage of the resilient receiver 3, a component of double frequency appears, as a result of which at the inputs of the modulo two 6 voltage impulses are received that are not equal in duration and shifted one after another in time by a value smaller

or more than half of the period, which leads to the appearance of a periodic signal at the output of the modulo two 6 and at the output of the inverter 7. Similarly, at the outputs of the adder 6 and inverter 7

there are periodic signals at an "ideal angle transfer," when the output voltage of the selsyn receiver 3 is below the sensitivity threshold of the amplifier shaper 5.

The proposed device has

compared with the known devices with much greater noise immunity, since, in the presence of an error signal, due to the non-linearity of the transfer characteristic of the amplifier-former, the influence of the interference voltage on the output voltage of the amplifier-former is not significant, and in the absence of an error signal, the interference voltage causes periodic signals simultaneously on the outputs of the adder and inverter.

Claims (2)

1.Akhmetzhanov A. A. High-precision angle transmitting systems for automatic devices, M., 1975. 2. USSR author's certificate No. 382998, cl. G 05 V 11/06, 16.08.71 (prototype).