SU763936A1 - Shaft angle-to-code converter - Google Patents

Description

The invention relates to systems for automatically controlling and controlling the angular displacement of a shaft, namely, to converters of the angle of rotation of the shaft into a code. A known converter of shaft rotation angle into a code comprising a sine-cosine rotary transformer (slope), phase-shifting circuits, a clock pulse generator, an angle transducer, and a null indicator ij. The disadvantage of this device is the presence of SCRT as a rotation angle sensor and a complex circuit for converting signals to code, in a result of which the reliability of the converter is relatively low. The closest to the technical solution of the invention is an angular displacement transducer into a code containing a clock driver named after them. pulses connected to a reversible counter, controlled generator, synchronization unit and keys 2. The disadvantage of this known device is relatively low reliability, since information is retrieved from the rotating shaft, and not from the motor control windings. The purpose of the invention is to improve the reliability of the converter angle of rotation of the shaft in the code. This goal is achieved due to the fact that a phase conversion unit, a phase detector and a command decoder are entered into the shaft angle converter, the phase conversion unit outputs are connected to the corresponding phase detector inputs and two clock pulse generator outputs, the phase detector outputs are connected to the summing inputs of the reversible counter, the control inputs of which are connected to two outputs of the command decoder, the third output of which is connected to the third input of the clock former. FIG. 1 shows the structural diagram of the converter of the angle of rotation of the shaft into the code; in fig. 2 is a timing diagram explaining the operation of the phase conversion unit. The shaft rotation angle-to-code converter contains a phase conversion block 1, a shaper of 2 clock pulses, a phase-determiner 3, a reversible counter 4, a decoder 5 commands,

The angle of rotation of the shaft of the stepper motor is converted by pulses controlling its working windings to the inputs of phase conversion unit 1 (Fig. 1). The outputs of phase conversion unit 1 are connected to inputs of phase determining 3 and forming a clock 2, while the outputs of phase determining 3 are connected to the summing inputs of the reversible counter 4, and the output of the clock maker 2 is connected to the counting input of the counter 4. The control of the reversible counter 4 is carried out using a decoder 5 commands, the outputs of which are To the control inputs of the counter 4.

The working winding of a stepper motor (not shown) separately with a phase shift receives pulses, which subshats also to the input of the phase conversion unit 1.

If signals to input 1 and input P (Fig. 2) received signals, then at the moment of the appearance of a pulse at input GO, the signal at input I disappears, and the stepping motor turns at a certain discrete angle in the positive direction. At the outputs of converter 1, two pulses appear with the second phase (output 11) lagging by 90 relative to the first (positive shift in Fig. A). With further alternation of signals in the sequence Bx.1, Bx, I, Bx.SH,

Bx.fl, Vh.Sh, vkh.1u, .vkh.ga, Vkh.1u, Vkh. one

etc. there will be a positive phase shift. In the case of reverse alternation of signals in the sequence H.P., H.I., H.L.V,

BX.1, BX 1U, inlet, inlet 1, inlet, in in1,

Вх.Ш, Вх.П, Вх.1, etc. there will be a negative phase shift. At the same time, at the output of the phase conversion unit 1, the second impulse will be ahead of the first one in phase by 90 ° (Fig. 2f),

From the output of the phase conversion unit 1, the signals go simultaneously to the phase detector 3 and the driver 2 clock pulses. The shaper 2 operates according to the principle of coincidence of the pulses at the outputs and § (Fig. 2), and a clock pulse (TI) is generated, which is received at the signal. Record in the reversible counter 4.

Phase-determinant 3 generates the Addition feature if its input received signals with a positive phase shift, and the Subtraction feature if it received signals with a negative phase shift.

The up / down counter 4 adds or subtracts clock pulses in accordance with commands from phase identifier 3. Reading information from reversing counter 4 is performed by the command Read, received from the decider 5 commands, through which the stepper motor is controlled into the code.

The exception in the converter of the angle of rotation into the code of the sensors registering the position of the shaft of the stepping motor in space allowed to significantly increase the reliability of the device. The expected annual economic effect from the introduction of the proposed device is 10,000 rubles.

Claims (2)

1. Author's certificate of the USSR 549825, cl. S 08 C 9/04, 1974. 2. USSR author's certificate  545998, cl. Q 08 C 9/04, 1975 (prototype). . Inputs I p m IS L j / l / l I I 5к1 ВххЛ M P B (P Bksh r LЁ61Х1 L 6х1 ti but. Pu2. Yl1 L L p g .;