SU898565A2 - Multipole rotary transformer - Google Patents

Description

(5) Multi-pole ROTATING TRANSFORMER

I

The invention relates to automation and can be used to create highly accurate angle measurement and transmission systems.

According to the main and BT. c. N 79908 is a known multi-pole rotary transformer comprising a rotor and a stator separated by an air gap. A concentrated output winding is placed in the slots of the rotor, and an excitation winding is located on the stator, made in the form of sections distributed uniformly among themselves, parallel to each other, with the adjustable inductive element l connected in series with each one.

A disadvantage of the known device is the incomplete autocompensation of the error of a multi-pole transformer caused by the unevenness of the air gap.

The purpose of the invention is to improve accuracy, tee.

The goal is achieved by the fact that a capacitor is connected in series with each section of the field winding.

Fig „1 shows a diagram of a multi-pole transformer; 2, the frequency characteristic of a series resonant circuit formed by an excitation winding section, an adjustable inductive element and a capacitor.

The device consists of a cylindrical rotor 1, in the slots of which the concentrated output winding 2 is laid, and the stator 3, in the slots of which

IS is laid identical sections of the excitation winding -7. Each of the sections includes the same number of pole pairs of the stator 3, that is. The number of pairs 2Q current - sections is a multiple of the number of pole pairs of a rotating transformer. Sequentially, inductive adjustable elements 8–11 and capacitors 12–15 are connected to sections 7–7 respectively. Winding sections 7 connected in series with adjustable inductive elements and capacitors are connected to a common to the source of alternating voltage 16. The rotor 1 and the stator 3, made, for example, of laminated electrical iron, is separated by an air gap of "When powering the sections of the winding of the excitation variable From the source 16, an emf is induced in the output winding 2, the magnitude of which varies according to a sinusoidal law, and the full period of change occurs when the rotor rotates through an angle J 2-ЯГ 0. -p-unit P is the number of pole pairs of a multi-pole transformer ( electrical reduction). In the known multi-pole transformers, the interaction between the stator and rotor windings causes an error due to the irregularity of the air gap. This error is proportional to the steepness K of the change in the EMF of a pair of poles coming out of the winding when changing, for example, from the eccentricity of the rotor (stator) installation, the air gap between the teeth of the interacting pairs of stator and rotor. Thus, by reducing the value of K, it is possible to reduce the error in question, and in the limit at K O to reduce it to zero. To satisfy the condition K O, it is necessary to regulate the current flowing in the turns of the excitation winding that make up a pair of poles so that the emf value induced in the turns of the output winding, remained unchanged when changing the gap. In known devices, the magnitude of the excitation current is determined by the resistance of the entire excitation winding and remains almost unchanged when defining the eccentricities of the rotor and stator, therefore the value of the EMF from one section significantly depends on the change in the gap. Due to the finite quality factor of the excitation winding sections, it is not possible to finish off with a complete stabilization of the emf when the gap changes and, consequently, to fully compensate for the error of the rotating transformer. To enhance the autocompensation effect, it is necessary to adjust the excitation current in such a way as to ensure that the emf is independent of the gap change in the presence of scattering flows and the real Q value of the winding sections, for which a series resonant circuit is used, whose frequency characteristic is shown in Fig. 2. Capacitors C of capacitors 12, 13, 1, and 15, which are part of such circuits, are chosen so that the resonant frequency UUf of these circuits is lower than the operating frequency (jJU of the source voltage 12 Increased the gap between the teeth covering the turns of the excitation winding sections and the corresponding rotor teeth covered by the turns of the output winding reduces the inductance L of the section of the excitation winding and, consequently, increases the natural frequency ii JF of the series resonant circuit. frequency response of the resonant circuit and to an increase in the excitation current. The steepness of the change in the excitation current with a change in the gap depends on the quality factor of the circuit and on How much the natural frequency of the circuit differs from the frequency of the voltage supply voltage constant voltage supply voltage source DC. Thus, when selecting the appropriate capacitance value of the capacitors 12, 13, T and 15, the series resonant circuits are tuned to the frequency (V, at which the winding section excitation current is allowed, stabilizing the output emf when the gap changes. invention invention Multi-pole rotating transformer auth.St. No. 79908, about tl and the fact that, in order to increase accuracy, the detector is included in series with the excitation winding sections. Sources of information taken into account in examination 1, USSR Copyright Certificate N79908, cl. H 02 K 2A / 00, 1979.

Claims (1)

Claim Multipole Rotary Transformer No. 799084, which includes the fact that, in order to improve accuracy, a capacitor is connected in series with the excitation winding sections,