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Double-fed aerogenerator stator

A technology for doubly-fed wind power generation and machine stator, which is applied to the shape/pattern/structure of magnetic circuit, static parts of magnetic circuit, shape/pattern/structure of winding conductor, etc. The work load of the inverter and the high harmonic content of the generator can improve the electromagnetic induction efficiency, simplify the insulation process structure, and save the electromagnetic wire.

Inactive Publication Date: 2013-01-30
JIANGXI TELLHOW SPECIAL MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this structure has no obvious effect on reducing tooth harmonics
This has caused the existing generators to have high harmonic content, especially serious tooth harmonics, which increases the workload of the inverter and makes the electrical performance of the motor poor

Method used

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  • Double-fed aerogenerator stator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1.5MW three-phase four-pole 48-slot doubly-fed wind turbine has 48 slots evenly arranged along the outer circle along the outer circle of the double-fed wind turbine; the number of poles is 4 poles, and the first pole 101 is slot 4-15 1. The second pole 102 is slots 16-27, the third pole 103 is slots 28-39, and the fourth pole 104 is slots 40-48 and 1-3; the number of slots in each polar domain is 12, and the number of phases is 3 Distributed winding coils, the three phases are represented by A phase (AX), B phase (BY), and C phase (CZ). Each phase winding consists of two short-pitch coils with a pitch of 9 and a pitch of 4, and each phase winding has 4 coils distributed in each polar region, three of which have a pitch of 9 and the other The pitch is 4.

[0018] The coils of the A-phase (AX) winding are respectively arranged in the slots 4-13, 5-14, 6-15, and 7-11 in the first polar region, and the four coils are electrically connected in turn to form the first turn c...

Embodiment 2

[0022] Further improvements can be made to the above embodiments. Since the random embedded winding is used as the winding of the stator of the generator, the slot on the stator core can adopt an oblique slot. More specifically, the inclined slots of the stator core can be set to have a pitch of 1 / 4, that is, a slot pitch of 0.25. Such a sloped core slot structure can weaken the tooth harmonics, especially the 11th and 13th tooth harmonics.

Embodiment 3

[0024] Furthermore, another improvement is made to the above-mentioned embodiment. The slots on the stator core are designed as semi-closed slots. Such a structure can make the insulation effect between the windings better, improve the electromagnetic induction efficiency of the windings, and further reduce the tooth harmonics, thereby improving the motor efficiency, reducing the noise and vibration amplitude of the motor, and reducing the temperature rise of the motor.

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Abstract

The invention provides a double-fed aerogenerator stator, which comprises a stator core and stator windings, wherein the stator core is provided with a plurality of slots; the stator windings are distributed and inlaid in the slots; the stator windings consist of a plurality of same random duplex lap windings; and the random duplex lap windings are formed by compounding two types of coils with different pitches. The slots on the stator core are skewed slots forming certain angles with an axial line of the stator, and the slots are semi-closed slots. The generator stator adopting the structure improves the electromagnetic induction efficiency of a double-fed aerogenerator, simplifies insulation process structures among the windings, greatly reduces the contents of tooth harmonic waves and other harmonic waves, reduces motor noises and vibration amplitude, lowers working burdens of an inverter, and improves the electric properties of the generator.

Description

technical field [0001] The invention relates to electric power equipment, in particular to a double-fed wind generator stator. Background technique [0002] With the increasing development of the power industry, the use of wind turbines is increasing. In the prior art, the stator winding of a megawatt doubly-fed wind turbine usually adopts a formed winding formed by winding several flat electromagnetic wires with a fixed pitch, that is, a hard winding. In order to fix the formed winding on the stator On the iron core, a groove parallel to the axial direction of the rotor is set on the inner or outer circle of the stator core, and then the forming winding is fixed in the groove of the iron core to form the generator stator. In this structure, the groove on the stator core needs to be an open groove, and must be parallel to the axial direction of the stator, and cannot be arranged as an oblique groove. This structure reduces the efficiency of electromagnetic induction, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/16H02K3/04
Inventor 林锦华
Owner JIANGXI TELLHOW SPECIAL MOTOR CO LTD
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