SU149148A1 - Electromechanical automatic controller or meter - Google Patents

Description

Electromechanical automatic controllers (meters) are known. However, the accuracy of their work is insufficient.

In the described controller, a phase-sensitive detector coupled to a measurement generator and phase shifter powered from a reference generator and mechanically connected to a development engine is used to increase accuracy and reliability. To simplify the regulator device, it uses a special motor having two rotor and two stator windings connected to the measurement and reference oscillators, respectively.

FIG. 1 is a block diagram of the described controller; in fig. 2 - connection scheme of a special engine.

The electromechanical automatic controller consists of a sensing element (sensor), a measuring generator 2, a phase-sensitive detector 3, a phase shifter 4, a reference generator 5, an amplifier 6, a working engine 7, and an actuator 8.

When the control object 9 acts on the sensitive element 1, the signal coming from it changes the frequency of oscillations of generator 2. The signal from the latter simultaneously with the signal from generator 5 is fed to a phase-sensitive detector 3, the output voltage of which is proportional to within 180 ° of the difference between the phases of the generator signals 2 and 5. This voltage causes the reversing two-phase asynchronous motor 7 to rotate, having a regulating effect on the object 9 through the device 8. To eliminate the dependence of the regulating Impact on object 9 from time to stator

No. 149148-2 windings 10 AND // of the phase shifter 4 are connected in such a way that during the rotation of the phase shifter 4 mechanically connected with the motor 7, a rotating magnetic field is created. Consequently, at different positions of the rotor 12 of the phase shifter 4 in the winding 13, an electromotive force will be induced, having a constant value, but different phases. As the frequency difference increases, the speed of rotation of the phase shifter 4, as well as the engine 7, will increase.

A motor 14 having mutually perpendicular stator 15, 16 and rotor 17, 18 windings can be used in the controller. On the stator winding 15 and the rotor winding 17, the voltage is supplied through phase-shifting capacitors 19 and 20, whereby the magnetic fluxes generated by the windings 15 and 16, as well as the windings 17 and 18, are shifted through an angle of 90 °. Two rotating magnetic fields are created between which interaction forces arise.

In the case where the frequency of the measurement generator 2 coincides with the frequency of the reference generator 5, the rotor 21 of the engine 14 does not rotate. If the frequency of generator 2 becomes greater than the frequency of generator 5 or less, then the rotor 21 begins to rotate in one direction or another, having made through the device 8 a regulating effect on the object 9. If necessary, the regulator can be equipped with an indicator device 22.

When using a meter for measuring purposes, the generator 2 is affected accordingly.

The described controller allows a very subtle effect on the regulated objects and to regulate at a low level the signals from the objects.

Subject invention

Claims (2)

1. An electromechanical automatic controller or meter, characterized in that, in order to increase the accuracy and reliability of the controller, it uses a phase-sensitive detector connected to a measuring generator and a phase shifter, powered from a reference generator, mechanically connected to a working engine. 2. The regulator according to claim 1, exeptly with the fact that, in order to upgrade the device, it uses a motor having two rotor and two stator windings connected to the measuring and reference generators, respectively.