SU364900A1 - NON-CONTACT REVERSIBLE DC CURRENT GENERATOR - Google Patents

Description

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The invention relates to the field of spin speed meters, namely to DC tachoheptors.

Non-contact reversible tachogenerators of direct current (BRTPT) are known, which contain a synchronous generator whose rotor is rigidly connected to a position sensor, a rectifier, a phase-sensitive unit, a bridge reversing stage and voltage converters.

The main disadvantage of such a BTFT is the complexity of the electrical circuit and the design of the tachogenerator.

The purpose of the invention is to simplify the electrical circuit and the design of the tachogenerator.

This is achieved by the fact that the position sensor windings are connected to a trigger device in such a way that two windings are connected through diodes between the bases of the transistors of one trigger and collectors of transistors of the second trigger, and the other two windings of the sensor are connected through diodes into the basic circuits of the transistors of the second trigger.

FIG. 1 shows the basic electrical circuit of BRTPT; in fig. Figure 2 shows an element of a magnetic circuit of a position sensor with a permanent magnet.

The tacho generator includes a synchronous generator with a winding 2, a rectifier 5, a reversing bridge stage 4, converters 5 of a DC voltage, a rotor position sensor 6 with windings 7-10 and a rotor in the form of a magnetic rod // two triggers made transistors 12-13, 14-15, semiconductor diodes 16-19. The element of the polishing sensor (Fig. 2) with the magnetic core 20, on which the output winding is placed, is excited by a permanent magnet 21 (or a coil with a current).

The proposed tachometer works as follows. When the device shaft is rotated, a voltage proportional to the speed of rotation arises on the output winding 2 of the synchronous generator. This voltage is applied to the rectifier 3, after which the bridge reversing stage 4 with a load in the diagonal.

The reversal bridge cascade is controlled as follows.

The initial state of the triggers is arbitrary. Suppose that transistor 14 is open. When the generator rotor rotates clockwise at the moment of time corresponding to the position of the rotor of the position sensor pa FIG. 1, the signal of the sensor winding 7, the passage through the diode 16, closes the transistor 12, and accordingly the transistor 13 opens. When the rotor of the sensor rotates 90 °, the output signal of the winding 8 closes the transistor 14. As this causes the base circuit of transistor 12 to break, transistor 12 remains in the closed state and transistor / 5 in the open state. When the sensor rotor rotates another 90 °, the output signal of the winding 9 closes the transistor 15, however, the signal of the sensor winding 7 is absent at this time, and the transistor 12 remains in the closed state. When the rotor of the sensor rotates over the next 90 °, the base circuit of transistor 13 is broken due to the closing of transistor 15, therefore, transistor 13 continues to remain open. Finally, when the sensor rotor returns to its initial state, the output signal of the winding 7, the passage through the diode 16 and the open transistor 14, also leaves the state of the transistor 12 unchanged. Thus, when the generator rotates clockwise, the state of the transistors 12 and 13 trigger. The signal taken from the collector of transistor 12 through direct current voltage converters 5 acts on the transistors of the reversing bridge stage 4. In the other direction of rotation, the transistor 13 is closed and the transistor 12 is open all the time. Signal taken from

the collector of the transistor 13, through converters 5 switches the transistors of the reverse bridge stage 4 relative to the previous direction of rotation, and the current through the load of the tachogenerator changes its direction.

Subject invention

Contactless reversible tachogenerator

a direct current containing a multiphase synchronous generator, the stator winding of which is connected via a rectifier to a reversible bridge stage controlled by a voltage transducer

A position comprising four permanent-magnet magnetic circuits and output windings with a logic device, characterized in that, in order to simplify the electrical circuit and design of the tachogenerator,

two sensor windings are connected via diodes between the bases of the transistors of one trigger and collectors of transistors of the second trigger, in the base circuits of the transistors of which two other windings are connected via diodes

sensor.

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