SU590795A1 - Snaft angular position-to-code converter - Google Patents

Description

(54) CONVERTER ANGLE OF TURNING SHAFT INTO CODE

The functional code converter 8 consists of a code converter 9 into the number of pulses and digital integrators 10 and 11. 12 - General bus.

The cosine output of the integrator 10 is connected to one of the inputs of the integrator I, the sine output of the latter to one of the inputs of the first, and their second inputs to the output of the 9 code converter in the number of pulses.

When the shaft of the sine-cosine sensor 1 is rotated at a certain angle, and in its output windings, voltages are generated, the amplitude of which is proportional to the sine and cosine of the angle of rotation of the shaft. The voltage Lcos a from the cosine winding is multiplied by device 2 by the digital code JVi from the output of the integrator 11, and the voltage / 7sin and from the sinus winding by the device 3 by the code N from the output of the integrator 10.

The output voltages of devices 2 and 3 are subtracted by device 4, the output of which is the voltage

  {/ SoLa -Usia.y.N.

It is known that with the help of two digital integrators, connected as shown in the drawing, it is possible to obtain a sinusoidal and cosine dependence in a digital code depending on the number of input pulses.

It follows that Ni s, mN, a, where A is the register code 7.

The device 9 serves to convert the register code 7 to the number of pulses proportional to the code, which is fed to the integrators 10 and 11.

The control voltage received at the output of device 4 is analyzed by comparator 5, which through control device 6 allows the selection of the code V in the register until AU is equal to 0.

AU - O and cos and sin L - sin a. cos N.

At this moment, the binary code in register 7 corresponds to the value of the rotation angle a of the shaft of the sensor 1, since

and cos a-sinN and siny. cos / V,

from where

N a.

As a result of the use of a digital functional code converter in the proposed converter, a simplification of the known device has been achieved, the accuracy of its operation in a wide temperature range has been improved by reducing the number of temperature-dependent nodes, which determines the economic effect.

Claims (2)

1.The converter of the shaft rotation angle into the code containing the sine-cosine sensor, the sine and cosine windings of which are connected to one of the inputs of the first and second multiplying devices, respectively, a subtractor, a comparator, the output of which through the control device is connected to the register input differing in that, in order to increase the accuracy and reliability of the converter, it introduced a functional code converter, the input of which is connected to one of the register outputs, and the cosine and sine outputs of the functional transducer code azovatel connected to other inputs of the first and second multipliers, respectively, whose outputs are connected to inputs of the subtractor, whose output is connected to one input of a comparator, the other input of which is connected to the common bus. 2. The converter according to. 1, characterized in that the functional code converter is made on a code converter in the number of pulses and two digital integrators, the cosine output of the first integrator is connected to one of the inputs of the second, the sinus output of the second integrator is connected to one of the inputs of the first, and the other inputs of the integrators are connected to output converter code to the number of pulses. Sources of information taken into account in the examination 1 USSR author's certificate №416717, cl. G 08 C 9/00, 1972. 2 USSR author's certificate No. 395878, cl. G 08 C 9/04, 1971.