SU1262647A1 - Synchronous reactive electric motor - Google Patents

Abstract

The invention relates to electric machines, not excitation excitation on the rotor. The purpose of the invention is to expand the functionality by obtaining a double value of the rotation speed. The electric motor contains a stator 1 on which winding 2 is located. The rotor 3 has pole protrusions 4, the number of which is equal to the number of pole pairs of the stator winding, and the pole arc length of the protrusion 4 should be about half of the double pole division. The coils of the winding 2 of the stator 1 of one of the polarities are swept along its circumference in one direction and at equal distances relative to the average position between the coils of opposite polarity. The coils of the winding 2 can be made with shortened steps, excluding the mutual overlapping of the coils of different polarities. The magnitude of the displacement of the coils may be half the pole division. In this SL of inventions, it is possible to obtain / additional rotation frequency by simple means. 2 з.п, ф-л, 2 pcs. F1 / g.1

Description

The invention relates to electric machines, namely machines not having excitation on the rotor.

The aim of the invention is to expand the functionality.

Figure 1 shows an electrical circuit of a single-phase motor winding; figure 2 - engine, cross section.

Winding is located on the stator 1

2 (shown frontal parts). Rotor

3 has pole protrusions 4, the number of which is equal to the number of pairs of poles. The length of the pole pole should be about half the length of the double pole division.

The engine works as follows.

The torque of a single-phase synchronous jet engine can be determined by the expression.

1 dL

.g

(one)

M

L

2 ae

de L - inductance of the motor winding;

i is the current in the motor winding; , 9 is the angular coordinate that determines the position of the rotor. inductance

sinKG; (2)

((3)

i i cosMt;

(four)

0

LC constant constituting;

de

LV is the variable inductance component;

Amplitude current value; t time;

the initial value of the angle is 0;

QOCА) - angular frequency of the power supply

stress; I - synchronous angular speed

engine rotation. By substituting (2) - (4) into the expression (1) you can get

1 M KLlIrr eosK (lt + 6)

after transformation

M M {2co3K (nt4-GO - -cos (KP + 2co) t + + Q QO -t-cos (KS7-20}) t + Kej, u,

gpe M -t-iio m 8

supposed

Kp-20 0 or Kn-2u) 0, (5)

available

(2i1 ± keo) + co8 (4sL ± Kvd) - -i-cosKSol.

The expression for the moment when executing the word (5) shows that the moment will contain a constant component

 Ke „,

causing maintaining rotation

otora.

Conditions (5) can be obtained that

 2 j.

The value of the parameter K depends on the number of pole protrusions of the rotor. In the known synchronous jet engines x the number of pole protrusions of the rotor is equal to the number of poles of the stator.

The value of the parameter K is also equal to this number. In this engine, the number of pole protrusions of the rotor is equal to the number of pole pairs of the stator, so that the parameter K can be halved and, accordingly, the engine rotates twice.

The second condition necessary to obtain the indicated effect is the unequal distribution of the coils of each phase of the stator winding during double pole division.

The optimal distribution is in which the active sides of all the coils belonging to the cat groups of two neighboring opposite poles are placed over half of the double pole division of the stator, and the second half of it becomes unwelded by that winding of this phase, s.

When these conditions are exceeded, the value of the parameter K is equal to the number of pole pairs of the stator winding. As a result, the rotational speed

120f

where n is the engine speed, rpm;

f frequency of power voltage

Hz;

P is the number of pairs of poles of the stator winding.

According to this expression, at a supply voltage frequency of 50 Hz, the values of, 3, 5 correspond to a rotation frequency of 6000; 2000; 1200 rpm unreachable for known synchronous motors.

The winding of the engine is performed by analogy-windings of conventional engines of this type from coil groups, made up of one or more coils, distributed across the / grooves of the stator core. For a single-phase motor, such a winding can be obtained from a conventional single-phase winding with coil groups of both polarities by pairwise elimination of the half of its coil groups. Marking the coil groups of the initial winding in the order of their following along the circumference of the stator boring with the numbers 1-1-0-0-1-1-0-0, etc., it is necessary to exclude all the coil groups marked with the numeral 0. The resulting winding will be have half the number of poles is original. The motor can be multi-phase. The winding of a t-phase motor is performed by laying m-single-phase windings on the stator. The windings of the two adjacent phases are stacked with a relative shift in the circumference of the stator boring or two t-parts of double pole division. naal hail An exception to this rule is a two-phase winding, which should be considered as four-phase when determining the relative shear. Thus, for a two-phase winding, the relative shift along the stator circumference is one pole division or 180 e. hail. Such a winding can also be obtained from a single-phase winding of a conventional motor, with the difference that the junction of the transition to a two-phase winding coil groups, jio labeled O, are not excluded, but are separated into an independent branch. used as the second phase of winding. This embodiment leads to an improvement in the use of the volume of the active part in comparison with a single-phase motor, which makes it possible to increase its overall power. For a three-phase winding, the relative phase shift around the stator circumference is 2/3 of the double pole division or 240 electrical degrees. This means that 474 that the relative arrangement of the phases of this winding is the same as in the three-phase windings of motors of a conventional design, but the phase order is changed. The technical and economic effect of the invention lies in the possibility of obtaining engine rotation speeds, which previously could only be obtained with more complex and expensive devices — dual power machines, collector or valve engines, frequency converters or frequency multipliers, which expands the functionality of the engine. . Formula 1 of the invention, Synchronous reactive electric motor containing a stator with a winding and a rotor with pronounced poles, characterized in that with an extension circuit of functional capabilities by obtaining a double value of the rotation speed for a given number of poles of a stator winding of an electric motor the stator windings, and the coils of the stator winding of one of the polarities are displaced along the stator circumference in the same direction and at equal distances relative to the average position or between the coils of opposite polarity. 2. An electric motor according to claim 1, in which the stator winding coils are made with a reference. With handles that exclude the mutual overlapping of coils of different polarities, 3, An electric motor as claimed in Claims 1 and 2, characterized in that the value of the coil displacement of one of the polarities relative to the average position between the coils of the counter-polarity is half pole division.

1

Claims (3)

Claim 1. A synchronous jet motor containing a stator with a winding and a rotor with pronounced poles, characterized in that, in order to expand the function. The number of rotor poles is equal to the number of pairs of poles of the stator winding, and the stator winding coils of one of the polarities are displaced along the circumference of the stator in the same direction and at the same distance relative to the average position between the coils of the opposite polarity. 2. The electric motor according to claim 1, characterized in that the stator winding coils are made with shortened steps, eliminating the mutual overlap of coils of different polarities. 3. The electric motor according to claims 1 and 2, characterized in that the displacement of the coils of one of the polarities relative to the middle position between the coils of opposite polarity is half the pole division.