SU1403265A1 - Asynchronous tachogenerator - Google Patents

Abstract

The invention relates to electrical engineering and can be used in the manufacture of asynchronous tachogenerators. The aim of the invention is to improve the accuracy, simplify the settings and expand the scope. The tacho generator contains a transformer 4, the secondary winding 3 of which is connected in opposite to the output winding 2, and the field of the excitation winding contains a phase-shifted RC chain and is connected to the power source of the excitation winding. The invention makes it possible to increase the accuracy of the output signal, simplify its adjustment, since it does not require mechanical rotation of parts of the tachogenerator, and work with any load resistance, which allows the expansion of the tachogenerator's field of application. I il.

Description

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 The invention relates to electrical engineering, in particular to asynchronous tachogenerators.

The aim of the invention is to improve the accuracy of the output signal.

The drawing shows an electrical circuit of an asynchronous tachogenerator (TG). TG contains a hollow rotor 1, an output winding 2, in series and counter-connected secondary winding 3 of transformer 4 and primary winding 5 of transformer 4 with an RC-chain phase-shifting RC containing a resistor 6, a capacitor 7. A winding 5 of two sections and an RC-chain are fitted in the bridge circuit, the two arms are formed by the sections of the primary winding 5 of the transformer 4, the other two arms by the resistor 6 and the capacitor 7. The TG and the excitation winding 8.

; TG works as follows.

 When the mains is turned on, the excitation winding (the bridge circuit also supplies a voltage with a frequency equal to the supply mains frequency. It is obvious that the voltage on the winding 3 of the transformer 4, which performs the function of compensation, has a frequency equal to ED, C in the input winding 2; and in phase with it in the absence of phase-shifting RC-chain.

; Due to the counter-switching output and; compensation winding occurs phase shift between the EMF vectors at an angle, pr | and approximately equal to 180 °. Full compensation of residual emf is carried out with

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by using phase-flashing RC chains, providing an accurate 180 ° shift between the residual EMF and EMF vectors of the compensation winding.

The advantages of this technical solution are the simplification of manufacturing technology, fine tuning, the ability to work with any load resistance, which ensures that the tachogenerator's application area is cleared.

Claims (1)

Invention Formula An asynchronous tachogenerator containing a hollow rotor, a stator with two mutually perpendicular windings - excitation and output - and a compensation winding located on the axis of the output winding and connected to it sequentially, characterized in that, in order to improve the accuracy of the output signal, to simplify tuning and expansion applications, it additionally contains a transformer and an -RC-chain, the compensation winding is made in the form of a secondary winding of the transformer and is switched on opposite with the output winding, the primary volume is TCA transformer comprises two sections connected in series, RC-chain is connected in series with the primary winding of the transformer, and the common connection point of the transformer primary winding sections and RC-element chain are connected to terminals of the excitation winding.