CN102290899A

CN102290899A - Three-pitch lap winding of high-speed high-power intermediate frequency sinusoidal generator stator

Info

Publication number: CN102290899A
Application number: CN2011102328799A
Authority: CN
Inventors: 林锦华
Original assignee: JIANGXI TAIHAO SPECIAL MOTOR CO Ltd
Current assignee: JIANGXI TAIHAO SPECIAL MOTOR CO Ltd
Priority date: 2011-08-13
Filing date: 2011-08-13
Publication date: 2011-12-21

Abstract

The invention discloses a three-pitch lap winding of a high-speed high-power intermediate frequency sinusoidal generator stator. Four generator stator winding branch circuits are connected in parallel according to a three-phase four-wire system. 18 turns of coils are connected in series in each phase, and each winding branch circuit occupies 27 slots. The stator winding of each phase is formed by connecting lap windings consisting of three pitches in series, wherein the number of turns of large-pitch coils is twice that of middle-pitch or small-pitch coils, and the numbers of turns of the middle-pitch and small-pitch coils are equal. A U phase, a V phase and a W phase are provided with four shunt-wound winding branch circuits with the same structure respectively, but form the electrical angle of 120 degrees with one another to form a three-phase symmetrical winding. The stator winding adopts the lap inserting coils, has small pitches, short end parts, a simple process, high processing properties and intermediate frequency voltage sinusoidal distortion rate of less than 2 percent, and overcomes the shortcoming that a conventional Delta-Y connected sinusoidal winding or a concentric sinusoidal winding with unequal numbers of turns cannot be adopted in a fractional slot.

Description

The sinusoidal wave intermediate frequency generator stator of a kind of high-speed high-power three pitches formula winding that changes

Technical field

The present invention relates to a kind of motor windings, the sinusoidal wave intermediate frequency generator stator of the especially a kind of high-speed high-power three pitches formula winding that changes.

Background technology

As everyone knows, in intermediate frequency generator, majority is a fractional-slot, and one of key technology is a fractional-slot stator winding sinusoidal designs.But existing △-positive chorded winding of Y connection is because the two-part wire gauge difference of its △, Y, number of turn difference, and also two parts winding will have 30 ° of electrical degrees poor, this method technology in fractional-slot is too numerous and diverse, and joint is many, and hidden danger of quality is many, advantage is not obvious, therefore, in fact seldom adopts.The positive chorded winding of existing in addition concentric type unequal-turn, because this winding composition condition whenever is in series the number of turn must be more, so this method generally just adopts in small generator, and number of poles is more in powerful intermediate frequency generator, whenever the number of turn that is in series is few again, can't adopt the positive chorded winding of concentric type unequal-turn.So above-mentioned two kinds of existing positive chorded windings do not adopt, must seek new sinusoidal winding construction form in high-power sinusoidal wave intermediate frequency generator.

Summary of the invention

The purpose of this invention is to provide the sinusoidal wave intermediate frequency generator stator of a kind of high-speed high-power three pitches formula winding new structure form that changes, reach the sinusoidal sex distortion rate of intermediate frequency generator voltage less than 2% requirement.

Technical scheme of the present invention is: the sinusoidal wave intermediate frequency generator stator of a kind of high-speed high-power three pitches formula winding that changes, comprise generator unit stator, the iron core slot number of described generator unit stator is that 108 grooves, number of poles are that 8 utmost points, generator unit stator winding parallel branch number are 4, connect by 3 phases, 4 line systems, whenever coil turn 18 circles that are in series, each winding branch road accounts for 27 grooves; U mutually in, the coil that the winding that is labeled as U1-U30 props up route coarse pitch, middle pitch, three kinds of pitches of fine pith is formed repeatedly, and the formula windings in series forms: coarse pitch is 10,7 coils are arranged, be labeled as U1-U10, be i.e. 1-11,2-12,3-13,4-14,15-25,16-26,17-27; Fine pith is 4, and 2 coils are arranged, and is labeled as U2-U20, i.e. 5-9,6-10; Middle pitch is 5, and 2 coils are arranged, and is labeled as U3-U30, i.e. 18-23,19-24; The coarse pitch coil turn is middle pitch coil or fine pith coil turn 2 times, and middle pitch coil and fine pith coil turn equate; These 11 coil U1-U10, U2-U20, U3-U30 connect entirely and form outlet is the winding branch road of U1-U30, and U has 4 winding branch road parallel connections mutually that structure is identical mutually; To prop up line structure the same with the winding of the U1-U30 of U phase, and V also has the identical winding branch road of 4 structures in parallel mutually mutually, is labeled as V1-V30; W also has mutually the identical winding branch road of 4 structures in parallel mutually, is labeled as W1-W30, but U, V, 120 ° of electrical degrees of W three-phase mutual deviation are formed three-phase symmetric winding.Each coil turn of described coarse pitch coil is 2 circles, and each coil turn of middle pitch coil is 1 circle, and each coil turn of fine pith coil is 1 circle.

The invention has the beneficial effects as follows: generator unit stator winding three-phase symmetry, 120 ° of electrical degrees of mutual deviation, the repeatedly formula windings in series that every phase stator winding is made up of three kinds of pitches forms, wherein the coarse pitch coil turn is the middle pitch coil number of turn or fine pith coil turn 2 times, the equal turn numbers of middle pitch coil and fine pith coil; According to such rule setting, the conductor number of generator unit stator winding in stator core slot equates, the copper factor equilibrium, and the stator winding pitch is little, and the end is short, all is that repeatedly formula rolls off the production line, and technology is simple, implements easily good manufacturability; Generator can be connected into external 34 line systems power supplies mutually, wherein 3 order harmonic components content are zero, 5 order harmonic components content are 0.7%, 7 order harmonic components content are 0.1%, the sinusoidal sex distortion rate of voltage of intermediate frequency is less than 2% requirement, has overcome the defective that existing △-positive chorded winding of Y connection or the positive chorded winding of concentric type unequal-turn can not adopt in this fractional-slot.

Description of drawings

Fig. 1 is one three a pitch winding branch road layout plan of the present invention.

Fig. 2 is a generator unit stator winding connection schematic diagram of the present invention.

Embodiment

The present invention is further described below in conjunction with drawings and Examples.

Embodiment 1 is shown in accompanying drawing 1-2: the sinusoidal wave intermediate frequency generator of a kind of high-speed high-power, power is 590KW, voltage 600V, frequency is 120HZ, rotating speed is 1800RPM, adopt the sinusoidal wave intermediate frequency generator stator of the high-speed high-power three pitches formula winding that changes, the iron core slot number of described generator unit stator be 108 grooves, number of poles be 8 utmost points, generator unit stator winding parallel branch number be 4, by 3 mutually 4 line systems connect, coil turn 18 circles that whenever are in series, each winding branch road account for 27 grooves; U mutually in, be labeled as U1, the winding of U30 props up the coil of three kinds of pitches of route and forms: the one, it is 10 that the pitch of 7 coils is arranged, and is labeled as U1U10, i.e. 1-11,2-12,3-13,4-14,15-25,16-26,17-27, each coil turn is 2 circles; The 2nd, it is 4 that the pitch of 2 coils is arranged, and is labeled as U2U20, i.e. 5-9,6-10, and each coil turn is 1 circle; The 3rd, it is 5 that the pitch of 2 coils is arranged, and is labeled as U3U30, i.e. 18-23,19-24, and each coil turn is 1 circle; These 11 coil U1U10, U2U20, U3U30 connect entirely and form outlet is the winding branch road of U1U30, and U has 4 winding branch road parallel connections mutually that structure is identical mutually; To prop up line structure the same with the winding of the U1U30 of U phase, and V also has the identical winding branch road of 4 structures in parallel mutually mutually, is labeled as V1V30; W also has mutually the identical winding branch road of 4 structures in parallel mutually, is labeled as W1W30, but U, V, 120 ° of electrical degrees of W three-phase mutual deviation are formed three-phase symmetric winding.

The stator winding of three kinds of pitches of Zu Chenging like this, pitch is little, and the end is short, all is that repeatedly formula rolls off the production line, and technology is simple, implements easily good manufacturability; The coil ratio of different pitches is little, the coarse pitch coil turn is middle pitch coil or fine pith coil turn 2 times, middle pitch coil is identical with the number of turn of fine pith coil, winding by such composition, generator can be connected into external 34 line systems power supplies mutually by Fig. 2, and wherein 3 order harmonic components content are zero, and 5 order harmonic components content are 0.7%, 7 order harmonic components content are 0.1%, and the sinusoidal sex distortion rate of voltage of intermediate frequency is less than 2% requirement; Overcome the defective that existing △-positive chorded winding of Y connection or the positive chorded winding of concentric type unequal-turn can not adopt in this fractional-slot.

Claims

1. the sinusoidal wave intermediate frequency generator stator of a high-speed high-power three pitches formula winding that changes, comprise generator unit stator, it is characterized in that: the iron core slot number of described generator unit stator is that 108 grooves, number of poles are that 8 utmost points, generator unit stator winding parallel branch number are 4, connect by 3 phases, 4 line systems, whenever coil turn 18 circles that are in series, each winding branch road accounts for 27 grooves; U mutually in, the coil that the winding that is labeled as (U1-U30) props up route coarse pitch, middle pitch, three kinds of pitches of fine pith is formed repeatedly, and the formula windings in series forms: coarse pitch is 10,7 coils are arranged, be labeled as (U1-U10), be i.e. 1-11,2-12,3-13,4-14,15-25,16-26,17-27; Fine pith is 4, and 2 coils are arranged, and is labeled as (U2-U20), i.e. 5-9,6-10; Middle pitch is 5, and 2 coils are arranged, and is labeled as (U3-U30), i.e. 18-23,19-24; The coarse pitch coil turn is middle pitch coil or fine pith coil turn 2 times, and middle pitch coil and fine pith coil turn equate; It is the winding branch road of (U1-U30) that the full series connection of these 11 coils (U1-U10, U2-U20, U3-U30) forms outlet, and U has 4 winding branch road parallel connections mutually that structure is identical mutually; To prop up line structure the same with the winding of (U1-U30) of U phase, and V also has the identical winding branch road of 4 structures in parallel mutually mutually, is labeled as (V1-V30); W also has mutually the identical winding branch road of 4 structures in parallel mutually, is labeled as (W1-W30), but U, V, 120 ° of electrical degrees of W three-phase mutual deviation are formed three-phase symmetric winding.

2. according to the sinusoidal wave intermediate frequency generator stator of the described a kind of high-speed high-power of the claim 1 three pitches formula winding that changes, it is characterized in that: each coil turn of described coarse pitch coil is 2 circles, each coil turn of middle pitch coil is 1 circle, and each coil turn of fine pith coil is 1 circle.