SU1252871A1 - Device for analyzing communication electric machine - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to improve the reliability and accuracy of measurement of reactive EMF. The device contains a fixed part of the magnetic conductor, made in the form of two arcs 1 and 2 and jumper 3, connecting the arc on which the measuring coil 4 is located. The magnetic circuit is located in the switching zone above the frontal part of the winding of the core. The U-shaped part 5 of the magnetic circuit encloses the coils of the core 6 as they exit from the groove and is mounted on the winding holder 7 at an angle to the machine axis, and its end parts are located by arcs 1 and 2. The magnetic flux, the passage through the part 5 of the magnetic circuit, the first gap , arc 1, jumper 3, arc 2, the second gap, induces a signal in coil 4, which varies in the process of switching. The signal from coil 4 is judged on the magnitude of the reactive emf. 4 il. And A with S (L IN9 cl 1C 00 S;

Description

The invention relates to electric machines, in particular to devices for studying the commutation of collector electric machines.

The purpose of the invention is to increase the reliability and accuracy of the measurement of reactive emf.

FIG. 1 shows the device; FIG. 2 shows a section A-A in FIG. 1; on fig.Z - and-shaped magnetic core; Fig. 4 shows changes in magnetic flux.

The fixed part of the magnetic circuit is made in the form of two arcs 1 and 2 and the bridge 3 connecting them, on which measuring coil 4 is wound. The fixed part of the magnetic circuit is located in the switching zone above the frontal part of the core winding and is attached to the frame of the machine (mount not shown). The second U-shaped part 5 of the magnetic circuit (figure 2), covering the coils of the core 6 when they exit from the groove, is attached to the winding holder 7 at an angle to the axis of the machine so that its end parts are located under the corresponding arcs 1 and 2. The measuring ends coils 4 are connected to an oscilloscope. The magnetic flux created by the current of the groove will pass through the U-shaped part 5 of the magnetic circuit, the air gap, arc 1 of the Fixed part of the magnetic circuit, jumper 3, arc 2 and the second air gap. In the process of switching sections of the groove, the magnetic flux changes and in the measuring coil 4 an EMF is induced, proportional to the reactive EMF of the sections.

With a change in the nature of the switching sections, the shape of the curve of change in the magnetic flux of the switched groove will also change, and hence the shape of the EMF curve induced in the measuring coil.

Fig. 3 shows the curves of change of magnetic nproka (a) and reactive emf H (b) for accelerated switching (curves 8 and 10) of slow switching (curves 9 and 11). According to the shape of the reactive EMF curve, it is possible to judge the nature of the commutation of the sections of the groove and the required shape of the distribution curve of the magnetic field of the additional poles in the commutation zone.

The proposed device for studying the commutation of DC collector machines by eliminating the sliding contact from the measuring coil circuit and its fixed attachment increases the reliability and accuracy of measurement of reactive EMF.

With the help of this device, it is possible to investigate the influence of individual factors on the switching process.

Claims (1)

Invention Formula A device for studying commutation of collector electric machines, comprising a magnetic core and a measuring coil, characterized in that, in order to increase the reliability and accuracy of measuring the reactive EMF, the magnetic core consists of two parts, one of which is made in the form of two arcs connected in a jumper the switching zone above the frontal part of the winding of the core and displaced one relative to the other in the axial direction, the other part covering the coils of the core as they exit from the groove and have a U-shaped the form is fixed on the winding holder at an angle to the axis of the machine so that its front parts are located under the respective arcs, and the measuring coil is wound on the bridge of arcs.  Fig.T but at Fig.Z Editor P.Kossey Compiled by S. Shutova Tehred M. Khodanych Proofreader M. Demchik Order 4627/53 Circulation 631 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 FIG.