SU132733A1 - Electromechanical bandpass tone filter - Google Patents

Description

Electromechanical devices are known with mechanical vibrators and electromagnetic transducers, each of which has only one winding. The main disadvantage of the known electromechanical filters of the tonal dianazone is that various external mechanical effects are perceived by them as interferences.

In the described device, this drawback is eliminated by the fact that an electromechanical filter with two independent tongue type vibrators, polarized electromagnetic converters, into air gaps — which include the ends of the vibrators — is equipped with four windings of converters. Each transducer has two windings, which are connected opposite and in series with each other.

FIG. 1 shows the design of an electromechanical filter; in fig. 2-diagram of the inclusion of the windings of the vibrator.

The electromechanical filter consists of a mechanical oscillatory system and two electromagnetic polarized transducers / and 2. The mechanical oscillatory system is formed by two tabs 5 fixed on a common base 4 and tuned to the same frequency. A change in the tuning frequency of the vibrator in the range of 60-360 Hz is achieved as a result of using tongues of different thicknesses. A fine adjustment to a given frequency of drainage is achieved with the aid of movable weights 5, which are then fastened with screws and filled with nitrolacco. At the ends of the tabs, typesetting measles 6 are fixed, which are placed in the gap of the electromagnetic transducers. Electromagnetic transducers provide practical independence of the tuning frequency on the magnitude of the working clearances and changes in the magnetic flux of the magnets.

Each electromagnetic sistelga has two windings 7, S and 9. 10 each, which are shielded between each other by the core and can be used separately (Fig. 2). The windings of different electromagnetic systems are connected in series with each other. Some of the windings are used as exciters, and the second as weekends.

The series connection of the windings of the excitation ensures that the tuning frequency of the vibrator is independent of the installation method, since each tongue is excited independently and oscillations are not transmitted through the base. The serial connection of the output windings provides compensation for the emf arising in the output windings during external shocks. Normally, the tabs oscillate in opposite directions, and with external shocks they shift to one side. Therefore, if in the first case of emf at the output of the windings are summed, in the second case they are subtracted.

Subject invention

An electromechanical bandpass tone filter with two mechanical tongue vibrators tuned to one frequency and two polarized electromagnetic converters, characterized in that, in order to eliminate interference from external mechanical influences, both transducers have two windings and each winding one converter is connected in series with the winding of the other converter.

FIG. i

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