RU2230419C1 - Three-phase pole-changing winding - Google Patents

Abstract

FIELD: electrical engineering; variable-speed motors. SUBSTANCE: proposed 20/4 pole-changing winding has 24 coil groups with equal number of coils per group, winding pitch y = z/2p₂. Coil groups are numbered in phases according to number series of 8i - 7, 8i - 5, 8i - 4, 8i - 2, 81 + 5, 8i + 7, 8i + 8, 8i + 10; coil groups bearing numbers 8i - 2, 8i - 4, 8i + 8, 8i + 10 have twice as small number of turns than those numbered 8i - 5, 8i - 7, 8i + 5, 8i + 7. In order to obtain 20-pole arrangement voltage should be applied to starting leads of coil groups 8i - 7. When voltage is applied to finishing leads of coil groups 8i + 8 with starting leads of coil groups 8i - 7 being integrated, four-pole winding is obtained. EFFECT: enhanced reliability of speed control at uniform coil distribution among slots; enhanced utilization of active materials at all speeds. 1 cl, 5 dwg

Description

The invention relates to electrical engineering and electrical engineering and can be used to create multi-speed electric motors.

Known three-phase pole-switched winding with the ratio of the pairs of poles p ₁ : p ₂ = 5: 1, containing 24 coil groups, the numbers of which are determined by the number sequence 8i-7, 8i-2, 8i, 8i + 5, 8i + 7, 8i + 10, 8i + 12, where i is the phase number (1).

A disadvantage of the known winding is that it has a large number of conclusions, low use of active materials at a higher engine speed.

Known three-phase pole-switched winding at 10-4-2 poles containing 24 coil groups, stacked with alternating two coil groups with the number of coils equal to z / 18, and two coil groups with the number of coils equal to z / 36, where z is the number of grooves on the stator, the numbers of coil groups in phases are determined by the number series 8i-7, 8i-4, 8i-1, 8i + 2, 8i + 5, 8i + 8, 8i + 11, 8i + 14, where i is the phase number (2 )

A disadvantage of the known winding is a large number of conclusions, coil groups are made with a different number of turns, the complexity of the circuit of in-phase connections.

Closest to the proposed invention is a three-phase winding with a ratio of the number of pairs of poles p ₁ : p ₂ = 4: 1, containing in each phase 2p ₂ coil groups (3).

A disadvantage of the known winding is the presence of multi-step coils, a low degree of use of active materials at both rotational speeds, the inability to obtain the number of poles 2p = 20.

The present invention solves the problem of creating a winding at 20/4 poles on the stators with the number of grooves that is a multiple of 36, which ensures high use of active materials at all speeds.

This problem is achieved in that the three-phase pole-switched winding for 20/4 poles contains 24 coil groups with the same number of coils in coil groups, performed with a step y = Z / 2p ₂ , where z is the number of grooves, the numbers of coil groups in phases are determined by a number series 8i-7, 8i-5, 8i-4, 8i-2, 8i + 5, 8i + 7, 8i + 8, 8i + 10, while the coil groups with numbers 8i-2, 8i-4, 8i + 8, 8i + 10 have half the number of turns of coil groups with numbers 8i-5, 8i-7, 8i + 5, 8i + 7, the beginnings of coil groups 8i-5 form a zero point, the conclusions 25, 26, 27 of the twenty-pole winding are taken from the beginnings of 8i -7 reel x groups, conclusions 28, 29, 30, four-pole winding taken from the ends of 8i + 8 coil groups.

In Fig.1 shows a detailed diagram of the winding, made in 36 grooves, in Fig.2 and 3 - the direction of the current on the sides of the coil groups and the magnetomotive force at 2p = 20; 4 and 5, the direction of the current on the sides of the coil groups and the magnetomotive force at 2p = 4. The direction of the current is shown for the moment when the current strength in phase A has a positive maximum value. In figures 2 and 4, the sides of the coils of phase A are indicated by a rectangle and a square, in phase B by a triangle, in phase C by an oval and a circle.

A three-phase pole-switched winding is made on a stator with a number of grooves 36, with a step of y = 9, contains 24 coil groups with a consonant and counter connection of the coil groups in phase. The beginnings of the phases of the twenty-pole winding are taken from 1, 9, 17 coil groups, and the four-pole phases are taken from the ends of 16, 24, 8 coil groups.

To obtain twenty poles, voltage is applied to the terminals 25, 26, 27, while the terminals 28, 29, 30 remain free.

If the voltage is applied to the terminals 28, 29, 30 with the combined 25, 26, 27, we get four poles.

With a winding pitch of y = 9, the value of winding coefficients is 0.945 / 0.79, which indicates a high use of active materials of the motor at all rotational speeds.

Sources of information

1. USSR author's certificate 756546, cl. H 02 K 3/28, 1980.

2. USSR Copyright Certificate 884039,

class H 02 K 3/28, cl. H 02 K 17/14, 1981.

3. Copyright certificate of the USSR 1376182, cl. H 02 K 17 / 14.1988, prototype.

Claims (1)

Three-phase pole-switched winding for 20/4 poles, containing 24 coil groups with numbers from 1 to 24, characterized in that the coil groups have the same number of coils in the coil groups, made with a step y = z / 2p, where z is the number of grooves, numbers coil groups are determined by the number series 8i-7, 8i-5, 8i-4, 8i-2, 8i + 5, 8i + 7, 8i + 8, 8i + 10, while the coil groups with numbers 8i-2, 8i-4 , 8i + 8, 8i + 10 have half the number of turns of the coil groups with numbers 8i-5, 8i-7, 8i + 5, 8i + 7, the beginning of the coil groups 8i-5 form the zero point, the conclusions 25, 26, 27 are twenty-pole windings taken from started 8i-7 coil groups, conclusions 28, 29, 30 of the four-pole winding are taken from the ends of 8i + 8 coil groups.

Images