SU1221698A1 - Polyphase opposite-pole inductor generator - Google Patents

Abstract

This invention relates to high frequency electric AC machines. The purpose of the invention is to increase efficiency by improving the symmetry of the phases of the generator. The generator contains a serrated stator with a distributed winding and pronounced poles with an excitation winding, a rotor with teeth. The number of teeth of the stator is made four times larger than the number of teeth of the rotor, and the pitch of the stator winding is made equal to two tooth divisions of the stator. With this arrangement of the stator and the rotor, each phase of the winding is distributed under the four poles, as a result of which the unevenness of the air gap affects the symmetry of the phases less. 3 il. (L N) to a from 00

Description

one

The invention relates to electric machines of alternating current, namely, to multiphase opposite-pole inductor generators of increased frequency.

The purpose of the invention is to increase efficiency by improving the symmetry of the phases of the generator.

FIG. 1 shows a generator sweep in FIG. 2 and 3 are vector diagrams of six- and three-phase winding voltages.

At each of the poles 1 (N, S), the number of which is equal to or a multiple of six, is located the excitation winding 2 and the coil 3-14 of the stator winding 15. The stator winding is made in steps equal to two teeth divisions. The coils 3-13 with odd numbers are shifted relative to the coil with even numbers 2-14 that are under one pole, Ha Fr / 2 el. glad.

In addition, coil 3 relative to coil 5, which is located at the other pole 1, is shifted by 2/3 by electr with the appropriate choice of the arc length of the interpolar gap (a). The coils 3-14 as required can be connected in series or in parallel.

The number of teeth 16 of the stator 15 is four times the number of teeth 17 of the rotor 18 ..

In order to avoid pulsating magnetic flux in the entire magnetic core, it is necessary that the number of teeth divisions of the rotor 18 per pole 1 (Zp) be integer. The phase shift of the EMF in the coils 3-14 adjacent poles 1 depends on the relative position of the teeth 17 of the rotor 18 relative to the stator 15.

If the interpolar gap with the winding 2 has an integer number of serration divisions of the rotor 18, then under the adjacent pole of the working winding coil are exactly in the same position and the EMF in these coils is shifted in phase by 180 degrees. due to polarity reversal (N and S). If the interpolar gap does not have a number of tooth divisions of the rotor 18, then under the adjacent pole 1 teeth 17 of the rotor 18 occupy relatively different positions of the coils 3-14 of the stator 15, i.e. pole 1 is shifted relative to the rotor teeth

25 30

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18, with which the phase shift of the emf in these coils is achieved.

When the gear rotor rotates, the magnetic resistance changes in

5 air gap. A change in the magnetic flux in the air gap induces an emf in the working winding, and a six-phase emf is induced in this generator, which by means of a corresponding connection of the coils is converted into a three-phase emf. Each phase of the winding is distributed under four poles, resulting in uneven air gap

fs less on symmetry

phases, and since only one conductor is laid in the groove width. it is covered on both sides.

If one plus comes Z

20 whole tooth divisions of the rotor, and Z is the number of rotor divisions falling on the interpolar space (groove of excitations), then

(one)

ZP 2p + Zg 2p-Z,

where Zj - the number of teeth of the rotor;

2p - the number of poles From,

-Zp .. (2)

2s

z.

2p

 The shear angle by which the EMF lags behind in the coils of the stator winding c, d is the next next pole relative to the previous one, with the numbering of the poles coinciding with the direction of rotation of the rotor, can be expressed as

(H-2Zb), (3)

where oi- is the phase angle of the emf in similar coils of the neighboring pole in el.grad. From (3) it follows that with 2Zb, c.ch. the phase shift of the emf in the coils of neighboring poles is iSO and a multiple of 180. In this case, the creation of a three-phase generator pole shift is not possible. To create a three-phase {six-phase oscillator by a pole shift, it is necessary that

. h. From (2) we get

2Zb -2Zo.

(four)

To .h. (for. h.) not 17

it is necessary that .ch., and since

the smallest value of the number of pairs of poles P is three, then the number of teeth of the rotor Z should not be a multiple of three.

The number of teeth divisions of the stator is four times greater than the number of teeth of the rotor, and since one tooth division of the rotor accounts for 360 e. hail .. then for one tooth division of the stator comes 90 al. This means that the neighboring coils of the working winding at each pole are shifted one relative to the other by 90 el, degrees. For example, between coils 3 and 4 there is a phase shift of 90 degrees. Grad. Similarly coils 5, 6 and 7, 8, etc. shifted one relative to the other by 90 el. hail. In addition, there is a phase shift between similar coils located on adjacent poles due to pole displacement. For example, between EMF coils 3 and EMF of a similar coil 5, as well as between coils 5 and 7, 7 and 9, etc. there is a shift in accordance with (3).

FIG. 2 shows a vector diagram for the case when the angle in (3) is 2A electr., And the numbers of the vectors correspond to the numbers of the coils in FIG. 1. From the vector diagram (Fig. 2) it can be seen that for. Formation of a three-phase EMF system. In one phase it is advisable to include

1221698L

3, 6, 9, and 12 katzpps, 4, 7, 10, and 13 in the other phase and 5, 8, 11, and the third, as shown in FIG. 3 (EMF addition is shown for only two coils in each phase).

In this case, it is achieved that the total emf of each phase decreases slightly (only by 3.4%), and the phase 10 behind is distributed under four poles (for a six-pole machine), which significantly improves the phase symmetry in comparison with the known machine

Claims (2)

Invention Formula Multiphase multi-pole inductor generator containing a toothed stator with distributed winding and newly expressed poles with excitation windings, the number of which is filled with a multiple of six, the rotor with teeth, the number of which is less than the number of stator teeth, characterized in that, in order to increase efficiency by improving the symmetry of the phases of the generator, the number of teeth divisions of the stator is four times as large as the number of teeth of the rotor, and the step of cleaning The stator webs are equal to two teeth of the stator. fig.g Fig 5 Editor M. Blanan Compiled by, Zolotov Tehred. Sopko Proofreader 2. Sirohman 1618/57 Circulation 631 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Branch ShSh Pat; 1t, Uzhgorod, st. Project, 4