SU1508344A1 - Shaft angle digitizer - Google Patents

Abstract

The invention relates to automation and computing and can be used to connect analog information sources with a digital computing device. In order to improve accuracy by compensating for errors from non-orthogonality of the axes of the rotor windings into a shaft rotation angle converter into a code containing a sine-cosine rotating transformer (SCWT) 1, two-phase power supply 2, zero-phase shifting units 7 In the pulse code, the counter of 8 pulses, the divider of 3 voltages is entered. SKVT 1 operates in the phase shifter mode. The presence of technological errors of SSCT 1 leads to a deviation from the proportionality of the shift in the phase of its output signals relative to the input. The voltage divider 3 is designed to reduce the influence of the error δγ _{2 on the} non-perpendicularity of the rotor windings of the SCRT 1, which is effective when using the SCRT, in which the error δγ ₂ prevails. Here, the resistors in the voltage divider 3 are selected from the ratio R ₂ / R ₁ = SINδγ. The zero-organs 4, 5, 6 form square-wave pulses, the phase shift between which is converted in block 7 into a number-pulse code. The number of pulses in each measurement cycle is counted by a counter 8. 1 Il.

Description

31508

The invention relates to automation and computing and can be used to connect analog information sources with a digital computing device.

The aim of the invention is to increase the accuracy of the converter by compensating for the error from the irregularity of the axes of the rotor windings.

The drawing shows a block diagram of the Converter.

The converter contains a sine-cosine rotating transformer (SCWT) 1, a two-phase power supply 2, a divider of 3 voltages, null-oryagyy 4-6, a unit 7 that converts the phase shift into a pulse code, a pulse counter 8. Voltage divider 3 is made on resistors R, IR.

The Converter operates as follows.

At the outputs of a two-phase source 2, a sinus U and cosine and voltage frequencies for the power supply SCRT 1 are produced. SCRT 1 operates in a phase shifter mode and its output is sine and cosine and the signals are out of phase with respect to the input signals and ,, and at an angle f , proportional to the angle of rotation of the shaft SC. From output voltages U :; SSCT 1, the divider of 3 voltages forms the voltage Vg.

The zero-organs 4-6 form rectangular pulses from the output signals of a two-phase power supply 2, a SSCT 1 and a voltage divider 3. The presence of errors of non-perpendicularity of the stator windings 8, the rotor of the equal amplitudes of the supply voltage 5 and 5 (or the transmission coefficient SCF 1 for the sine and cosine channels) leads to a deviation from the proportionality of the phase shift of the output signals Uj and and SCWT 1 relative to the input signals U; and a two-phase source 2 as a function of the angle of rotation of the ACS 1. In block 7, the output signals of the zero-organs 4-6 are summarized in phase,

As a result of the summation in block 7, partial compensation occurs.

rauny errors to the value of the second order of smallness.

Voltage divider 3 is designed to reduce the influence of the error and perpendicularity of the rotor windings of SCRT 1, which is effective when using SCRT, where the error J "prevails. In this case, the resistors in the voltage divider 3 are chosen from

 - sinS y.

50

5 30

35 0

0

At the output of block 7, pulse trains form cyclically. The number of pulses in each pack is proportional to the angle of rotation of the rotor of the SCRT 1. The output pulses of block 7 in each cycle are counted by a counter 8, at the output of which the position code of the angle of rotation is formed. At the beginning of each cycle, the counter 8 is reset to its initial position by applying a pulse to the installation inputs (not shown).

I

Claims (1)

Invention Formula The shaft angle of rotation is converted into a code containing a sine-cosine rotating transformer whose inputs are connected to the outputs of a two-phase power source, the first outputs of a two-phase power source and a sine-cosine rotating transformer are connected to the inputs of the first and second zero organs, respectively, the third zero -organism, the output of which and the outputs of the first and second null-organs are connected to the inputs of the phase-shift-to-pulse code conversion unit, the output of which is connected to the counting input of the imp counter lsov, characterized in that, in order to increase the accuracy of the transducer, it stresses introduced divider whose inputs are connected respectively to the first and second outputs of the sine cosine vraschakschegos transformer, and an output coupled to an input of the third zero-organ.