Fractional slot wave winding symmetrical four-branch wiring method

A wiring method and branch circuit technology, applied in the shape/style/structure of winding conductors, can solve the problems of weakening high-order harmonics and limiting the number of branches in motor performance, and achieve the effect of weakening high-order harmonics

Pending Publication Date: 2022-07-08
浙江富春江水电设备股份有限公司
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Problems solved by technology

[0003] The present invention mainly solves the problem that the performance of the motor in the prior art is limited by the number of branches; it provides a symmetrical four-branch connection method for fractional slot wave windings, and when the number of pole pairs p of the motor is an odd number, the number of branches a= 4 and the winding branch is symmetrical, at the same time, the winding has a short distance ratio to weaken the high-order harmonics

Method used

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  • Fractional slot wave winding symmetrical four-branch wiring method
  • Fractional slot wave winding symmetrical four-branch wiring method
  • Fractional slot wave winding symmetrical four-branch wiring method

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Embodiment

[0018] Embodiment: a fractional slot wave winding symmetrical four-branch wiring method, the present invention sets the number of motor pole pairs to be p, the number of motor slots to be Z, the number of phases m=3, the number of pole pairs p is an odd number, and each pole is an odd number. The number of phase slots q is expressed as q=Z / (2pm)=b+c / p (where b, c, and p are positive integers, and c / p is an irreducible true fraction). Under this condition, 3q=3(b+c / p)=H+e / p is defined, where H is the integer closest to 3q, and e is the smallest (±) integer that makes H closest to 3q. figure 1 It is a schematic diagram of the slot position when Z slot, q=b+c / p, e=-2, the meaning of H is the slot connected with the interval H pitch, and the slot position difference Δ=e / p, so within the range of q slot That is, the number of slots N that can be connected according to the slot position difference of Δ in the 60° phase band is N=q / Δ=(b+c / p) / (e / p)=(bp+c) / e slots, These N slots are r...

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Abstract

The invention discloses a fractional slot wave winding symmetrical four-branch wiring method, which comprises the following steps that Z slots of a motor are divided into four phase strip lines along an H pitch closest to the slot value of each pole for three phases, and every two separated phase strip lines in the four phase strip lines are symmetrical at an electrical angle of 180 degrees; taking a group of 180-degree symmetrical phase strip lines as basic phase strip lines, and taking the rest group as short-distance phase strip lines; the grooves on each phase belt line are trisected into A-phase, B-phase and C-phase phase belts, each phase is provided with two basic phase belts and two short-distance phase belts, and the basic phase belts and the short-distance phase belts of each phase deviate by s grooves; a basic phase belt and a short-distance phase belt are taken, upper-layer conductors and lower-layer conductors of the basic phase belt and the short-distance phase belt are alternately used in the phase belts and connected in series at an H pitch, and the phase belts are connected through jumper wires according to polarity to form two loop branches; the front and rear structure pitches of the winding are equal; the winding branch is composed of a basic phase belt and a short-distance phase belt and can weaken higher harmonics.

Description

technical field [0001] The present invention relates to the technical field of three-phase AC motor windings, in particular to a symmetrical four-branch connection method of fractional slot wave windings. Background technique [0002] The number of parallel branches a used by the double-layer short-distance wave winding of a three-phase motor is related to the number of pole pairs p corresponding to the synchronous speed of the motor. The general traditional theory of the motor believes that the number of branches a can only be selected by a factor of 2p to make the winding branches symmetrical. For the hydro-generator, under the grid frequency of 50Hz, the number of pole pairs corresponding to the rotational speed of 428.6, 272.7, 230.8, 176.5, and 157.9r / min are respectively p=7, 11, 13, 17, and 19 are odd numbers , because 2p / 4=p / 2 is not divisible, so the number of 2p poles does not contain a factor of 4, so it is considered that there is no symmetrical branch with bran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K3/28
CPCH02K3/28H02K2213/03
Inventor 黄亿良闫晓辉李冬翠宗日盛杨言启刘俊杰刘晓慧朱荣华朱何会凌少钦钟伟张麟
Owner 浙江富春江水电设备股份有限公司
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