SU840998A1 - Shaft angular position- to-code converter - Google Patents

Description

(54) CONVERTER ANGLE OF SHIFTING THE SHAFT INTO THE CODE OF THE SENSOR ARE TAKEN BY RECTANGULAR PULSE SIGNALS U, (t) AND UGI (t) With Duration Tj. T, where T is the repetition period of the pulse signals U, (t) and U2. (T). When the primary windings of the SCRT sensor are epi.t pulse signals and (t) and Uj (t) on the output sinus and cosine windings, respectively, are induced impulse signals, mismatch Ujpac. (t) and Ugpac. (t), whose amplitudes are proportional to the misalignment angle between the shaft KVT sensor and receiver. With the help of a key, the pulse signals of the Tsarah (t) and U, pofc. (T) signals are separated from other signals that do not carry information about the measured angle, and then summed with each other. the mismatch is allocated the first harmonic with a frequency W whose amplitude is proportional to without taking into account the technological errors of the SCRT sensor and receiver, is due to. non-perpendicularity of their secondary windings, the mismatch angle between the shaft of the sensor and the Receiver. A sinusoidal error signal is fed to the motor control winding, which rotates the shaft of the SSCT receiver until the angular mismatch is eliminated. When this is the angle of the shaft of the SCRT sensor equal to the angle of the shaft of the SCVT receiver and the indicator block mounted on the shaft of SCVT The meter indicates the numeric equivalent of the sensor angle measured. When implementing a converter, in order to eliminate the effect of transients that occur when the primary windings of the SCWT sensor are pulsed, negatively affect the accuracy of the converter, the relations, where, utjj is the duration of the pulses coming in, starting the windings of the primary sensor; T0 is the repetition period of the pulse signals arriving at the powering of the SCR. Moreover, to obtain a high speed transducer, the repetition period of the pulse signals should be equal to preE. where sproe. The limiting frequency of the alternating voltage supplied to the power supply of the SCRT sensor for this class of SCRT. The indicated ratios are fulfilled for the majority of multipole SCHWTs, in which the constant times Tg are very small, i.e. y-y. . -J This type of SQUT includes inductosins, reductosins and other types of SCHTs. However, in practice, in a number of cases, SCZTs are used with large time constants (bipolar SCWT), in which condition (1) is not fulfilled, since m-. o ar aJnpea. . Such SCWTs include, for example, commercially available bipolar BT-5 type SCWT, in which Tmc 10 ml / a. In this case, the practical implementation of the known device becomes complicated due to the appearance of large transients at the output of the SCRT receiver arising when the primary windings of the SCRT sensor are energized with pulsed signals. Consequently, the effect of transients arising in the case of pulsed powering of the SBCT on the output error signal and on the accuracy of the converter especially affects the construction of the converter based on the SSCT with long time constants. The purpose of the invention is to improve the accuracy of the converter by eliminating the influence of transients on the accuracy of the converter. The goal is achieved by the fact that in the converter of the shaft rotation angle into the code containing the reference voltage generator, high harmonics filter connected by the output to the input of the useful signal shaping unit, a sinus-cofinus rotating transformer-sensor, the synchronization windings of which are connected to the synchronization windings cosine rotary transformer-receiver, output winding-. The first and second keys are connected to the input of the adder, the third, fourth and fifth keys are entered, a matching unit, an inverter, two zero-organs and a frequency divider, and the output of the reference voltage generator is connected to the input of the matching unit, the first output of which is through the third and fourth keys are connected to the corresponding input windings of the sine-cosine rotating transformer-sensor and through the first null-organ are connected to the control input of the fifth key, the output of which is connected to the input of the higher harmonics filter An information input of the fifth switch is connected to the output of the adder, the second output matching block through a second zero-body is connected to the input of the frequency divider, the output

which is connected to the control inputs of the first and third keys and through the inverter to the control inputs of the second and fourth keys.

Figure 1 shows the structural diagram of the transducer angle of rotation of the shaft. code; 2 shows timing diagrams explaining the operation of the converter.

A shaft rotation angle converter into a code contains a reference voltage generator 1, a sine-cosine rotating transformer-sensor 2, a sine-cosine rotating transformer-receiver 3, keys 4-8 adder 9, a filter of 10 higher harmonics, a unit 11 of forming a useful signal, consisting of amplifier 12, motor 13 and indicator unit 14, matching unit 15, nullorgan 16, frequency divider 17, inverter 18, null organ 19, matching unit 15, made in the form of a transformer operating in current transformer mode.

A sine-cosine rotary transformer (SCWT) sensor 2 has two quadrature primary windings that are connected via keys 6 and 7 to the first output of matching unit 15, whose input is connected to the output of generator 1, and SCWT receiver 3 has two quadrature secondary windings that through the keys 4 and 5 are connected to the input of the adder 9, the output of which is through the key 8 and the filter 10 of the highest harmonics connected to the input of the unit 11 of the formation of the useful signal.

The second output of matching unit 15 is connected via null organ 16 to the input of frequency divider 17, the output of which is connected to control inputs of keys 4 and b and through inverter 18 to control inputs of keys 5 and 7. The first output of matching unit 15 is also connected to input 1G zero-organ, the output of which is connected to the control input of the key 8.

Converter angle of rotation of the shaft in the code works as follows.

From the output of the generator 1 (Fig. 1), a sinusoidal signal (Fig. 2a) is fed to the input of the matching unit 15 from the first output of which through the keys b and 7 it goes to the powering of the primary quadrature windings of the SCWT sensor 2. As one of the keys, for example 6, the other key 7 is in the normally open position / and the other key 7 is in the normally closed position due to the inverter 1, depending on the switching signal input to the control of the inputs of the keys 6 and 7, the voltage from the generator 1 is supplied to the power sine.

the primary winding of the SSCT sensor 2 (via key 6) or the power supply of the cosine primary winding of the SSCT sensor 2 (via key 7). When connecting one of the primary windings of the CCDT sensor 2 to the output of the generator 1, a current 3 equal in amplitude flows through the primary winding of the matching unit 15

ten

Ujj is the voltage of general generator 1;

  CTL - active and inductive resistance of the primary winding of the SSCT sensor 2

X - inductive resistance of the primary

winding block 15 matching 15,

and out of phase with respect to the vector of the output voltage of the generator 1 at an angle P equal to

vp-orct () h to .-.,., .. /

CtiBT

thirty

at

.BT

V s.

which is accomplished by selecting the appropriate parameters of the matching unit 15, which operates in the current transformer mode, while the voltage induced in the secondary winding of the matching unit 15 coincides in phase with the current vector flowing through the primary winding of the STC sensor 2.

Since XcKftT (which is usually done in practice),

 , while the voltage at the second output of the matching unit 15 is also shifted relative to the vector of the output voltage of the generator 1 by 90 ° (Fig. 26).

From the voltage taken from the second output of the matching unit 15 using zero-body 16, rectangular pulses (such as a square wave) are formed

(Fig. 2b), which are then fed to the input of a frequency divider 17, consisting, for example, of N consecutively impacted triggers, where, 2,., Z. The output of the divider -17 frequency is formed - positive, rectangular pulses of low frequency (Fig.2d),

Uj

 where, 4 ...,

..M. one

with

equal to

J- - which go directly to the control inputs of the keys 4 and b and through the inverter 18 to the control inputs of the keys 5 and 7. Moreover, due to the inclusion of the inverter 18, positive pulses to the control inputs of the keys 5 and 7 {Fig. 2e) is shifted in time with respect to positive pulses arriving at the control inputs of the keys 4 and b by an amount equal to. I t, where T,. After the control of the cich (positive) pulses, the keys 6 and 7 alternately turn on, pass the output voltage of the generator 1 to the power supply of the sinus winding (fig.2d) for the period 0: o k then and the cosine winding (fig.2i) period f 5- T t T of the SSCT-sensor 2. When powering the primary windings of the SBCT-sensor 2 is interrupted by sinusoidal signals U (t), key 6 (fig.2d) and Uj (t) switch 7 (fig.2i). On the output secondary windings of the SCNT receiver 3, also intermittent sinusoidal signals Ug, (t) (at the output of the sinus secondary winding of the SCRT receiver 3) and U4 (t) (at the output of the sinus secondary winding of the SCVT receiver 3) are formed, respectively , the reference signals U (t) and U2 (, t) The signals Utj (t) U (t) from the outputs of the secondary windings of the SCRT receiver 3 are fed through the keys 4 and 5, which are alternately switched on from the output pulses of the frequency dividers 7 and the inverter 18 to the input of the adder 9, at the output of which a sinusoidal error signal is formed or (2a). Using the key 8, controlled from the output rectangular pulses of the zero-organ 19, positive (or negative, depending on the mismatch sign) half-wave are obtained from the sinusoidal error signal, the constant component of which (Fig.2n, and ) - Upoc. It is used as a useful control signal from the filter, 10 high harmonics and an amplifier 12 to the control winding of the motor 13. Under the influence of the control signal Upac. the motor 13 spins the shaft of the SSCT receiver 3 until the error signal is eliminated. At this, the angle of rotation of the shaft of the SSCT receiver 3 is equal to the angle of rotation of the shaft of the SSCT sensor 2, and the indicator unit 14 indicates the numerical equivalent of the measured angle without taking into account errors due to non-perpendicular secondary and primary Hbix windings of the SCHWT sensor 2 and SCHVT receiver 3, respectively. When switching the primary windings of the SSCT sensor 2 in the electrical circuit of the excitation winding, which is a combination of resistor R and inductance L of SKVT (RL circuit), transients occur, which cause the appearance of secondary parasitic pulse signals on the output windings of the SSCT receiver 3 ( interference). To eliminate the spurious pulse signal (noise), which in the output circuit of the converter leads to direct conversion error, in this converter the initial phase of the reference voltage due to additionally introduced elements and the choice of the corresponding block diagram of the converter in the excitation circuit and acting reference stress. The amplitude of the pulse signal (interference) is zero, i.e. In the process of switching the windings, transients practically do not occur and the current (or voltage) of the stationary mode is immediately established in the circuit. To eliminate the small and long-term emissions caused by switching the windings due to various parasitic capacitive connections between the wires of the synchronization circuits (fig.2n), the harmonic error signal passes through the key 8, which is turned on by the output zero rectangular pulses 19, shifted in phase relative to the reference pulses of the zero-organ 16 wa 90. In this case (Fig. 2k), spurious emissions that occur at the time of switching the windings do not pass through key 8, and therefore do not affect on the accuracy of the converter. Invention Formula Shaft rotation angle converter into a code containing a reference voltage generator, a harmonic filter connected by an output to the input of a useful signal shaping unit, a sine-cosine rotational transformer-sensor, the synchronization windings of which are connected to the synchronization windings of a sinus-sinus-spin-down transformer-receiver transformer, the output windings of which are connected via the first and second keys to the input of the adder, about tl, and that, in order to increase the accuracy of the transducer, in th administered third, fourth and fifth keys matching unit, the inverter, the two zero-body and

a frequency divider, the output of the reference voltage generator is connected to the input of the matching unit, the first output of which is connected to the corresponding input windings of the sine-cosine rotating transformer-sensor via the third and fourth keys and connected to the control input of the fifth key output through the first zero-output windings which is connected to the input of the filter of higher harmonics, the information input of the fifth key is connected to the output of the adder, the second output of the matching unit through the second null-organ is connected to the input of the Divider hour The voltages, the output of which is connected to the control inputs of the first and third keys, and the frequency of the inverter are connected to the control inputs of the second and fourth keys.

Sources of information taken into account in the examination

1.Ahmetzhanov A.A. High-precision automatic corner transmission systems. M., Energie, 1975, p. b.

2..Assignment of the USSR on the application 1648447 / 18-24,

cl. G 08 C 9/04, 1978, (prototype).

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Claims (1)

Claim A converter of the angle of rotation of the shaft into a code containing a reference voltage generator, a higher harmonic filter connected by an output to the input of the useful signal generating unit, a sine-cosine rotating transformer-sensor, the synchronization windings of which are connected to the synchronization windings of the sine-rotating sine transformer-receiver, the output windings of which are through the first and second keys are connected to the input of the adder, which means that, in order to increase the accuracy of the converter, a third, fourth the fifth and fifth keys, the matching unit, an inverter, two zero-organs and a frequency divider, the output of the reference voltage generator being connected to the input of the matching unit, the first output of which is connected through the third and fourth keys to the corresponding input windings of the sine-cosine rotating transformer-sensor and through the first zero-organ is connected to the control input of the fifth key; the output of which is connected to the input of the higher harmonics filter, the information input of the fifth key is connected to the output of the adder, the second output of the matching unit is connected to the input of the frequency divider through the second zero-output, the output of which is connected to the control inputs of the first and third keys and through the inverter to the control the inputs of the second and fourth keys.