SU1182403A1 - Converter of angular speed of shaft rotation into pulse repetition frequency - Google Patents

Abstract

ANGULAR SPEED ROTATION OF THE SHAFT INTO THE FREQUENCY OF FOLLOWING THE PULSES, containing a pulse generator, the output of which is through a frequency divider, a driver of sinusoidal voltages. a phase shifter and a pulse shaper are connected to the first one-vibrator, a second one-shot and a trigger, characterized in that, in order to increase the resolution and expand the range of measured speeds, the logical element OR is introduced into it, the output of the first single-oscillator directly, and the pulse shaper output through the second the one-shot are connected respectively to the first and second inputs of the OR logic element, the output of which is connected to the trigger input of the trigger, the information input to (L connected to the output of the pulse generator.

Description

(ru. /

one .

The invention relates to instrument engineering and can be used in systems of automatic control and stabilization of rotational speed, in particular in pulse systems of electric drive with discrete control.

The aim of the invention is to increase the resolution and expand the range of measured speeds.

Fig. 1 shows a diagram of the converter for the angular velocity of rotation of the shaft into the pulse frequency j in Fig. 2 — timing diagrams of its operation.

The converter contains a pulse generator 1, the output of which is through a frequency divider 2, a sinusoidal voltage generator 3, a phase shifter 4, the rotor of which is connected to the object under study, and a pulse shaper 5 connected to the inputs of two single-oscillators 6 and 7, whose outputs are separately connected to the first and the second inputs of the logic element OR 8. The output of the logic element SH1I 8 is connected to the clock input of the trigger 9, the information input of which is connected to the output of the generator 1 i pulses.

The Converter operates as follows.

The output signal from the pulse generator 1 (Fig. 2) is fed to a frequency divider 2, which performs frequency conversion, decreasing it with a multiplicity equal to two, to the value required to power the phase shifter 4 (Fig. 28). The power to the phase shifter 4 is made through the sinusoidal voltage driver 3. During the circular rotation of the object under study, the phase shifter 4 converts the rotation angle of the rotor relative to the stator to the phase shift of the output sinusoidal voltage of the phase shifter relative to the equivalent sinusoidal voltage (Fig. 2). The output sinus output / voltage of the phase shifter 4 after the pulse shaper 5 (Fig. 22) is fed to the inputs of two single vibrators 6 and 7, which are triggered respectively by TejibHbiM and negative differential 82403, 2

mi pulses forming 5 pulses (Fig.2o). The pulses from the output of the logical element OR 8 (Fig.2e) arrive at the clock

5, the trigger input 9, to the information input of which pulses are output from the pulse generator 1.

At the moment of time t, the positive differential of the pulse from the output of the logical element OR 8 coincides with the pulse of the pulse generator 1 and the trigger 9 goes into one state (Fig. 2), as a result of which the leading edge is formed

J5 output pulse.

In the time intervals ,, t, -tj, the rotor of the phase shifter 4 is rotated by an angle at which the positive differential pulse with

The 20 outputs of the logic element OR 8 coincides with the pulse of the pulse generator 1, the trigger 9 remains in one state.

With further rotation of the rotor

25 phasers 4 at time tj a positive differential pulse from the output of the logic element OR 8 coincides with a negative differential pulse of the generator 1 pulse-. An owl that triggers the trigger 9 to the zero state, as a result of which the trailing edge of the output pulse is formed.

When the rotor rotates 360, N matches occur (where N is the division factor of divider 2) of positive and negative impulses received at information input of trigger 9, with positive impulses coming at clock input of trigger 9, and N output at trigger output 9 is formed pulses. .

Pulse frequency,

45 incoming ng clock input trigger-ira 9, twice the frequency of the supply voltage of the phase shifter 4, therefore, the frequency of the output pulses from the trigger 9 can be

50 within, the frequency of the output pulses from the trigger 9; f is the frequency of the supply voltage from the output of the shaper of 3 sinusoidal voltages.

Since the rate of change of the phase of the output signal of the phase shifter 4 is proportional to the angular velocity.

rotation of its shaft, then the pulse frequency at the output

11824034

trigger 9 will be proportional to this speed.

Claims (1)

a phase shifter and a pulse shaper is connected to the first one-shot, a second one-shot and a trigger, characterized in that, in order to increase the resolution and extend the range of measured speeds, an OR logic element is introduced into it, the output of the first one-shot directly, and the output of the shaper through a second one-shot connected respectively to the first and second inputs of the OR gate, the output of which is connected to the clock input of the trigger, the information input of which is connected to pulse generator output.