SU809283A2 - Shaft angular position-to-code converter - Google Patents

Description

to the windings via a two-position switch 2 and a linear voltage-to-voltage converter 3 to the first input of the converter 4 of the code into the code whose first output is connected to the code storage register (not shown in Fig. 1), and the second output through the function 5 converter of voltage and key b - to the input

linear converter 3 voltage to code, control block 7, the inputs of which are connected to the outputs of the control of each signal control unit. Conversion ends of converters 3 and 5, and outputs to the control input

 key b, the fourth input of the converter 4 code into the code and one of the inputs of the selector .8 octant 1, the other inputs of which are connected to the output windings of the SCRT 1 and the power bus, and the outputs to the control input of the two-position switch 2, as well as to the second and third inputs Converter 4 codes to code directly and through block 9 constants that are multiples of 45. Converter code 4 and code addition block 11 are also included in converter 4, and code to voltage function converter 5 (FIG. 2) permanent resis Orae 12 and 13 are connected through the matrix 14 with resistors ko digital control input of the operational amplifier 15 with a constant resistor 16 in the feedback circuit.

The device works as follows.

Analysis of the sign of the phase and the ratio of the amplitudes of the output voltages U and 1) 3 of the SSCT makes it possible to separate the total range of change of the angle of rotation Q of its rotor into eight sections (octants) of 45 ° each. The region number (feature) is determined by the octant selector 8, which sets the constants block 9 to the position where the constant code for this segment and the corresponding to its left boundary are connected to the first, input block 11 addition of the converter codes 4 codes to the code sets the two-position switch 2 to the position where the voltage U (1,4,5 and 8 octants) or U (2,3, octane) is connected to the input of the linear voltage converter 3 in the first cycle of the device operation 6th and 7th octant). The converter generates a digital code of the voltage applied to its input, which is in the form of a direct or reverse code (depending on the parity feature of the octant generated by the octant selector 8) is supplied (if there is a destruction signal generated by the control unit 7 at the time of the corresponding timing to the end of the cycle conversions in converter 3)

to the functional converter 5 of the code to the voltage through the block 10 of the transmission of the code, the converter 4.

Functional transducer 5 possesses the arcsine characteristic of the transform and transforms the code Nj-associated sinusoidal dependence with the angle of rotation Q of the rotor SCWT 1

(one)

(N,.,),

sin Q

N.

j.-t schach e and the voltage proportional to Q, i.e.

Ufcux arcsin N ,, kQ, (2)

where k is the dimensional coefficient J

Ufewir is the output voltage of the functional converter 5. In the second cycle of operation of the device, the voltage Oxx is converted into code N1 by means of the linear converter 3. To do this, after the end of the conversion cycle in the functional converter 5, the control unit 7 generates a resolution signal, in accordance with which the octant selector 8 sets two-way switch 2 to the neutral position, disconnecting the output windings of the SCRT 1 from the converter 3, and the key 6 is set to the closed position, connecting the voltage Ub nx from the output of the functional converter 5 to the input of the converter 3. The latter forms the digital equivalent of the voltage applied to its input (in the presence of the enable signal generated by the control block. 7 at the time corresponding to the end of the second conversion cycle in the converter 3) to the second input of the block 11 adding codes of converter 4. Code adding block 11 implements the operation of adding N codes

and

yr /

displaying, respectively, the octant and the rotation angle d of the rotor of the SCRT within this octant.

Thus, the error in the nonlinearity of the conversion characteristic in the proposed device is eliminated, thereby increasing its order of magnitude.

Claims (1)

1. USSR author's certificate 591900, cl. 6 08 C 9/04, 21.05.76 (prototype).