RU-2861404-C1 - METHOD FOR WINDING DISTRIBUTED STATOR WINDINGS OF ELECTRIC MACHINE

Abstract

FIELD: electrical engineering. SUBSTANCE: invention relates to methods for forming windings of electrical machines. A method for winding non-salient pole distributed stator windings of an electric machine consists of laying an insulated winding wire made of a conductive material into winding slots between the teeth of the stator core of the electric machine, alternately completely bypassing groups of teeth on the left and right, winding an equal number of winding turns on them, from two or more, first in one direction to the end. To achieve the technical result, the winding is completed by passing in the opposite direction along the winding direction with the placement of a compensating 'half-turn', after which, with a shift by one slot, the next winding row is laid in a similar manner, thus forming a distributed winding with completely symmetrical coils with an integer number of turns. The resulting magnetic flux of the stator core has no lateral deviations, creating maximum magnetic voltage on the stator poles. EFFECT: increase in power and energy efficiency of the machine. 1 cl, 2 dwg

Inventors

• Lagutin Sergej Sergeevich
• GOLOVKO OLEG ANATOLEVICH
• Seklyutskij Sergej Anatolevich

Dates

Publication Date

20260505

Application Date

20251124

Claims (1)

1. A method for winding non-salient-pole distributed windings of an electric machine stator, which consists in the fact that the first row of insulated winding wire, made of conductive material, is placed in the winding slots between the teeth of the electric machine stator core, alternately completely enveloping the left and right groups of teeth, with an equal number of winding turns, from two or more, first in one direction to the end, then along the winding in the opposite direction with the laying of a compensating "half-turn", after which, with an offset into one slot, the next row of winding is laid in a similar manner, thus forming a distributed symmetrical winding with an integer number of turns in the coils.

Description

The invention relates to the field of electrical engineering in terms of electrical machines. A synchronous electric motor-generator is known, patent RU 181979 U1, describing a stator with a three-phase winding and a rotor made in the form of a multi-pole magnet with alternating m magnetic poles uniformly spaced around the circumference, with a pole pitch equal to , wherein the stator is made with N<m teeth with symmetrical and asymmetrical caps separated by grooves, the winding of the stator winding is performed in phases for groups of teeth located symmetrically around the circumference of the stator at an angular distance from each other, wherein one group for winding one phase includes teeth with symmetrical and asymmetrical caps, and the angular distance between the edges of the caps facing the group of teeth intended for winding another phase is equal to the angular distance between the pole divisions of the number of magnetic poles of the rotor, equal to the number of successively located teeth of one group related to one phase. The model described in the patent has the following drawback: the winding, performed on a group of stator teeth with alternating winding directions, will always have an incomplete number of turns on each tooth due to the connecting sections between the teeth and the transitions between coil groups. These transitions will consequently create an axial deviation of the working magnetic flux from the plane of rotation. This leads to a decrease in magnetic voltage at the stator poles and the appearance of a lateral magnetic gradient on the active surface of the teeth. This, in turn, creates an axial force on the motor shaft, thereby loading the bearings and leading to increased wear, reducing the overall efficiency of the electric machine. Furthermore, the fewer turns the stator winding contains, the higher the described losses will be, reducing the efficiency and service life of the electric machine. The closest winding method is the one described in RU 2799495 C1. The disadvantage of this method is its low manufacturability when winding multi-turn windings with two or more turns per coil. The technical problem that the present invention is aimed at solving is the need to create a high-tech winding method that will allow for the machine-generated formation of an integer number of turns in the stator winding coils, since the inter-coil transitions of the winding wire of an electric machine are also current-carrying parts and create their own magnetic induction fluxes, causing a deviation of the working magnetic induction flux from the plane of rotation. The technical result consists in increasing the power and energy efficiency due to the reduction of electrical losses in the winding and the improvement of the interaction of electromagnetic fields in the air gap between the rotor and the stator of the motor, which is achieved by the symmetrical placement of the winding turns in the stator slots with the formation of an integer number of turns in each winding coil. The claimed method is illustrated by the drawings Fig. 1 and Fig. 2, where a schematic diagram of a two-turn phase winding is shown with a dotted line, in which the letters H and K indicate its beginning and end, a thick solid line shows the location of the compensating "half-turn" that supplements the missing parts of the coils, and the numbers in a circle number the winding slots of the stator. Drawing Fig. 1 shows the first part of the phase winding coils, while drawing Fig. 2 shows the phase winding in its entirety, together with the coils wound with an offset in one slot. The method for winding non-salient-pole distributed stator windings of an electric machine involves placing an insulated winding wire made of conductive material in the winding slots between the teeth of the electric machine's stator core, alternately completely encircling the left and right groups of teeth. An equal number of winding turns (two or more) are wound on them, first in one direction to the end, then in the opposite direction, inserting a compensating "half-turn." Afterward, the next row of winding is placed in a similar manner, offset into one slot. This creates a distributed winding with fully symmetrical coils with an integral number of turns. The resulting magnetic flux of the stator core has no lateral deviations, creating maximum magnetic voltage at the stator poles. The proposed method completely eliminates deviations of the working magnetic flux from the plane of rotation and increases the service life of electrical machines, since such a winding does not create an axial load on the bearings during operation. Practical application of the method. The stator of a 55 kW transport electric motor was rewound using the described method. With the same number of turns and identical wire, the winding resistance and weight decreased after rewinding. Motor tests showed a reduction in operating noise and a 12% increase in power, reaching 62