SU930513A1 - Combined synchronous motor-tachogenerator - Google Patents

Description

 (5) COMBINED CHHXPOHHbiVT MOTOR GENERATOR

I

The invention relates to electrical engineering and can be used as an actuator in electric drives equipped with a speed feedback circuit.

Known synchronous engine generators, structurally combined in general. Case having separate magnetic systems of the engine. tl and tachogenerator tl,}. Their disadvantage is complexity.

Also known are combined tachogenerator engines in which the working (motor) and tachometer windings are located on a common stator.

The closest to the proposed device to the technical essence and the tasks to be solved is a synchronous motor-tachogenerator 2, containing a rotor with constant magnet. and a stator with a working winding, each section of which is located

on the tooth, and sectioned tachometer winding G23.

However, in the known device, the sections of the tachometric winding are located on the same teeth and in the same way as the sections of the working winding, as a result of which there is a strong mutual inductive connection between the working and tachometric windings. As a result, in addition to the emf of rotation, in the tachometer winding, the emf is caused by the currents flowing through the working windings (emf of the core reaction). This feature worsens the metrological characteristics of the tachogenerator.

The purpose of the invention is to improve the metrological characteristics of the tacho generator.

The goal is achieved

20 in that the stator teeth are made with longitudinal slots along the teeth axes on the side of the stator bore, and each section of the tachometer winding is two

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sides laid in the mentioned. grooves of two adjacent teeth;

FIG. 1 shows a structural diagram of the engine-generator; in fig. 2 shows one of the variants of the scheme for connecting the sections of the tachometer winding.

The motor-tachogenerator contains a rotor 1 with permanent magnets and a stator with a collar 2 and teeth 3. Each of the teeth 3 is made with a longitudinal groove 4, located on the side of the bore: along the axis of the tooth. Sections 5 of the working winding, made in the form of coils, are placed on the teeth 3 "Each of the 6 sections of the tachometer (Tsotki (Fig. 1 solid fat lines) with two working sides laid in the grooves L of two adjacent teeth 3. The sections 6 of the tachometric winding are connected in a three-phase star (Fig. 2). With a four-pole rotor and six stator teeth, each phase of the tachometer winding is formed by two sections 6, located opposite (Fig. 1).

The yoke of the stator 2 is made of stainless steel rings, the teeth 3 are made of electrical steel plates oriented in planes parallel to the longitudinal axis of the machine. When the teeth are longitudinally laminated, a groove 4 is formed by reducing the height of several middle plates. The connection scheme of sections 6 of the tachometer winding (Fig. 2) is designed for connection to a three-phase electronic circuit for converting 9DC to direct current voltage — a phase-sensitive rectifier for a reverse tachogenerator and a conventional three-phase rectifier for a non-reverse tachogenerator.

The device works as follows.

When the rotor rotates in the working and tachometer windings an emf is induced. Core field induced by currents flowing through the workflow

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the winding, due to the misalignment of the said windings, does not affect the EMF of the tachometer winding. The improvement of the metrological characteristics in the proposed device is achieved by weakening the inductive coupling of the tachometer winding to the working winding. the spatial separation of the magnetic axes of both windings. Thus, the force line of the core reaction box (Fig. 1, dashed line) is practically not linked to section 6 of the tachometric winding. At the same time, the coupling of the tachometric winding to the permanent magnet field remains strong due to the arrangement of sections 6 near the stator bore.

The proposed device differs from the known one by the improved ratio of the useful signal to the noise induced by the currents of the working winding.

Claims (2)

1.Ovchinnikov I.Ye. and Lebedev N.I. Contactless DC motors. L., Science, 1979, p. 231,. . rice Xf-1. 2.Ovchinnikov I.E. and Lebedev N.I. Contactless DC motors. L., Science, 1979, p. 238, .ris. XI-7.