RU-2861405-C1 - METHOD FOR WINDING PHASE WINDINGS OF STATOR OF MULTI-POLE ELECTRIC MACHINE

Abstract

FIELD: electrical engineering. SUBSTANCE: invention relates to methods for forming windings of electrical machines. A method for winding the phase windings of a stator of a multi-pole electric machine consists of laying an insulated stator winding wire made of a conductive material into slots between the teeth of the magnetic core of the stator of the electric machine, alternately completely bypassing each tooth on the left and right, winding an equal number of turns on them, first in one direction to the end. To achieve the technical result, the winding is completed by passing in the opposite direction with the placement of an additional 'closing half-turn'. Thus, a stator winding is formed, in which an integer number of turns is wound on each tooth, and the magnetic flux vector of the teeth of the magnetic core has no lateral deviations, thereby creating maximum magnetic voltage on the active surface of the stator teeth. EFFECT: increase in efficiency and output power in all modes, as well as an increase in the generated voltage in the generation mode. 1 cl, 1 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 the phase windings of a stator of a multi-pole electric machine, which consists in the fact that an insulated winding wire, made of a conductive material, is placed in the grooves between the teeth of the magnetic circuit of the stator of the electric machine, alternately completely enveloping each tooth from the left and right with an equal number of winding turns, from two or more, first in one direction to the end, then in the course of winding passing in the opposite direction with the laying of a “closing half-turn”, thus forming an integer number of turns around each tooth of the stator magnetic circuit.

Description

The invention relates to the field of electrical engineering in terms of electrical machines. A synchronous electric motor-generator is known (patent of the Russian Federation No. RU 181979 U1 from 2017.12.29 by the author Alexander Stepanovich Andreenko), containing 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 One group for winding one phase includes teeth with symmetrical and asymmetrical heads, and the angular distance between the edges of the heads facing the group of teeth intended for winding the other phase is equal to the angular distance between the pole pitches of the rotor's magnetic poles, which is equal to the number of consecutive teeth in one group related to one phase. The multi-pole stator winding is realized on a group of teeth with alternating winding directions. 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 a non-integral number of turns on each tooth due to the connecting sections between the teeth. Consequently, the magnetic flux vector will always deviate from the stator tooth axis. This leads to a decrease in magnetic voltage at its poles and the appearance of a lateral magnetic gradient on the active surface of the teeth. This gradient, in turn, creates an axial force on the motor shaft, loading the bearings and leading to increased wear, thereby reducing the overall efficiency of the electric machine. The fewer turns the stator winding contains, the higher the described losses will be and the lower the efficiency of the electric machine. A known method for winding multi-pole phase stator windings, patent RU 2751533 C1, is the closest to the present invention. It has one drawback: its low manufacturability when windings are produced by machine winding. The technical problem that the present invention aims to solve isis the need to create high-techa winding method that allows the machine to form an integer number of turns of winding on each stator tooth. The technical result consists of increasing the efficiency and output power in all modes, as well as increasing the generated voltage in the generation mode. The claimed method is illustrated by the drawing: Fig. 1 - winding diagram. The method for winding the phase windings of the stator of a multi-pole electric machine consists in that the insulated wire 2 of the stator winding, made of a conductive material, is placed in the grooves between the teeth 1 of the magnetic circuit of the stator of the electric machine, alternately completely enveloping each tooth on the left and right with an equal number of turns wound on them, first in one direction to the end, then, along the course of winding, passing in the opposite direction with the laying of an additional "closing half-turn" 3. In this way, a stator winding is formed in which an integer number of turns is wound on each tooth and the magnetic flux vector of the magnetic circuit teeth does not have lateral deviations, thereby creating the maximum magnetic voltage on the active surface of the stator teeth. The proposed method eliminates all possible deviations of the magnetic induction flux vector from the stator tooth axis and increases the efficiency of salient-pole electric machines. As an example, let's consider a two-turn winding, where each tooth of the stator magnetic circuit has two full turns of the phase winding. The winding diagram is shown in Figure 1, where number 1 depicts the teeth of the electric machine's magnetic circuit, number 2 depicts the winding wire, and number 3 indicates the bypass "shorting" half-turn, highlighted by a thick line. The beginning and end of the phase winding are designated by the letters H and K, respectively. This results in a high-tech winding that does not distort the magnetic flux emanating from the teeth of the electric machine's stator magnetic circuit. Practical application of the method: Several flagship hub motor models from various leading manufacturers were rewound using the described method. The number of turns and winding connection diagram were left the same as the original. The remaining hub motor components were left unchanged. Tests after rewinding in all cases showed an increase in motor efficiency and output power by 5 to 7%. In generation mode, the rewound hub motors showed an increase in generated voltage by 5 to 7%.