SU1644312A1 - Thyratron motor - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to valve electromotor bodies with permanent magnets. The aim of the invention is to improve the manufacturability of an electric motor. The stator with clearly expressed poles with a three-phase winding contains two parts 1 and 2 poles, the areas of the stator poles are equal to the areas of the rotor poles, the poles of each of the stator phases are shifted relative to each other by one pole division of the rotor. In this case, the magnetic circuit 3 of the stator is made of three parts, separated by a non-magnetic gap, and each part contains the poles of one of the phases, the rotor also consists of two parts, which are not located in the two magnetic cores so that the magnets located on the same pole division have the same magnetization and placed on the same magnetic circuit. The invention can be used to create electric motors for household appliances. 4 il. cl

Description

The invention relates to electrical engineering, namely, permanent magnet valve motors (FEA).

The aim of the invention is to improve the manufacturability of an electric motor.

FIG. 1 a, b shows the design of a single stator magnetic system (two projections); 2a, b show the rotor structure (two projections); on fig.Z - the stator; Fig. 4 shows plots of the distribution of the MDS poles as a function of the angle across the stator bore, where FAI is the MDS phase A of the poles of the second part of the stator; F A2 - MDS, phase A of the poles of the second part of the stator; FjrA.B MDS formed by the total interaction of MDS phases A and B of the Perzoy poles and the second parts of the stator.

The presented variant of foreign trade activities is made with face-bipolar, however, an arbitrary number of rotor poles is possible, with each pair of rotor poles

there will be three poles of the first and three poles of the second parts of the stator with the corresponding phase coils.

FEA contains a stator and a rotor. The stator consists of three magnetic systems (Fig. 1), each of which contains a pole 1 of the first part of the stator, a pole 2 of the second part of the stator and a magnetite 3. At the poles of both parts there is a phase winding 4. These magnetic systems are installed relative to each other gaps (not shown) so that the poles of one phase are offset relative to each other by an angle equal to one pole division of the rotor. The rotor (figure 2) consists of magnets forming the poles 5 of the first part and the pole 6 of the second part and located respectively on the first 7 and second 8 parts of the rotos magnetic cores

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pa These parts are separated by a non-magnetic conductive gap 9.

Works FEA as follows. Consider the processes occurring in the FEA in the inter-switching interval, when through the inverter any two phases of FEA are connected to the power source, for example, A and B (this method of connecting FEA is the most common at the present time, and any other inverter can be used half bridge or bridge type). To simplify the presentation, let us consider alternately changing the MDS of the phases A and B of the first and second parts of the stator as a function of the angle 9 along the stator bore. As mentioned above, the O sign indicates the magnetic field lines formed by the current in the coils of the first pole, and the V sign of the second stator parts.

When current flows through the coils of phase A (Fig. 3), the magnetic field lines (labeled O) exit the surface of the pole of the first stator part, enter the first part 7 of the rotor magnetic core (Fig. 2), are distributed over the latter and enter in the poles of phases B and C of the first part

stator on angle from -o to 2 k. The passage of the flux into the second part of the stator is prevented by a nonmagnetic conductive gap 9 (Fig. 2). The flow that has entered the pole of the phase C of the first part of the stator passes through the magnetic wire and its lines of force come out of

Phase C poles at an angle from —Tu- to L: the second part of the stator and enter the second part 8 of the rotor magnetic core (FIG. 2). The flow that has entered the pole of phase B of the first part of the stator passes through the magnetic conductor and its lines of force exit from the pole of phase B

n the second part of the stator on the angle from -n-to

five

-tgl and also enters the second part of the rotor magnetic circuit. There, this total flow combines, exits the second part of the rotor magnetic circuit, and enters the pole of phase A of the second part of the stator at an angle

"- 5 from $ 1, then passes on magnetoO

the wire of the phase A poles, where both the beginning and the ends of the magnetic flux lines formed by the MDS coil of the phase A are connected. The magnetic field lines formed by the MDS coil of the phase A and entering the pole of the second stator part of the phase A (marked with V), pass This is not the same way and is therefore not described in detail.

0

five

0

five

0

five

0

five

Fig. 4a shows the distribution of MDS over the first part of the stator formed by the pole of the first part of the stator with the A-FAL coil. Fig. 46 shows the distribution of the MDS over the second part of the stator formed by the pole of the second part of the stator with the coil. The total MDS of the poles of both parts of the stator of the phase A Pd1 + Pd2 is shown in fig.4b as a function of the angle of rotation in the bore of the stator. The shape of this curve can be traced backwards in Fig. 3, moving clockwise.

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In the zone from 0 to all the magnetic flux lines emerge from the poles of the first and second parts of the stator, MDS max.

on. In the zone from

to l: power lines in

d t to the pole of the first part and exit from the pole of the second part of the stator, the total flux is zero, and the total MDS of these

5 parts is zero. In the zone from to -kkzh all

The magnetic field lines enter the poles of the first and second parts of the stator and the total MDS in this zone is maximum and has the opposite polarity. AT

zone from - - n to 2 ts (0) the magnetic field lines enter the pole of the second part and exit the pole of the first part of the stator. The total flux in this zone is zero and the MDS is also zero, respectively.

If now the current flows in phase B and the phase A connected oppositely considered above, then it is obvious that the distribution of MDS phase B along the stator bore will be similar to the distribution of MDS phase A shown in figure 4 a and b, but only the curves of MDS phase B will be inverse and offset by angle

the MDS curves of phase A. From here, the resulting MDS curve formed by phase B, which is the total MDS of the poles of the first and second parts of the stator FBI + Pb2, will also be inverse and shifted

In on the relative FAI + Pd2 curve, before

put on figv. The FBI + Pb2 curve is shown in FIG. 4d. The total MDS between the poles of the first and second parts of the stator, formed by the current flowing through phases A and B, is equal to the sum of MDS Pd1 + Pd2 of fig.4b and FBI + Pv2 of fig.4g and corresponds to the curve .B shown in fig.4d (when summing up MDS we assume that the electric motor is unsaturated).

By expanding the MDS curve RЈd in the Fourier series on one period along the bore of the stator and limiting it to the first four members of the decomposition, we obtain

FzA, 1.910V sln0 + 0 + 0 + 0, (1) where B is the amplitude value of the MDS curves

FA1 + FA2 and FB14FB2 (figv, g).

From (1) it can be seen that the highest spatial harmonics of the order of v 2, 3, 4 in the MDS curve (F Ј A in) are absent. The MDS FEA curve will have the same shape on any other inter-switching gap, with any other connections of the FEA phases connected in a star, via an inverter to the power supply. Compared with the known VED, it has higher manufacturability due to simplified rotor manufacturing and the possibility of magnetizing magnets after rotor assembly, as well as the possibility of using standard ring magnets, eliminating cutting processes of magnets, and using standard inductors for magnetization. At the same time, the energy indicators of foreign trade activities do not decrease, since, as in the well-known, there are no significant higher spatial harmonics of the MDS response core.

Claims (1)

Invention A valve motor comprising a stator with a three-phase winding of the core located at the poles and a rotor with poles formed by alternating polar permanent magnets located on the magnetic circuit, the poles of the stator and the rotor consist of two parts displaced in the direction of the active length of the electric motor, in which the areas of the poles of the stator and the areas of the poles of the rotor are respectively equal, while the poles of each of the phases of both parts of the stator are offset from one another by an angle equal to one pole In order to improve manufacturability, the stator is made of three magnetic systems separated by non-magnetic gaps, and the rotor magnetic core is made of two concentric parts, also separated by a ring non-magnetic gap, each containing a magnetic stator on it, the poles of both parts of the stator of the same phase, and the magnets of both parts of the rotor poles, located on the same pole division, have the same direction of magnetization and placed respectively on the indicated parts of the rotor magnetic circuit. but  four L u Lig. FIG. 2