Brushless doubly-fed machine hybrid cage type rotor structure and winding method

A cage-type rotor and doubly-fed motor technology, which is applied in the field of variable-frequency speed-regulating drive and variable-speed constant-frequency power generation, can solve problems such as unreliable welding, inconvenient winding of hybrid cage-type rotors, and poor insulation performance, and reduce processing costs. Difficulty and manufacturing cost, low harmonic content, and the effect of reducing winding copper loss

Inactive Publication Date: 2017-07-14
CHONGQING UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0008] At the same time, the invention also provides a winding method for the rotor with this special structure, so as...

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  • Brushless doubly-fed machine hybrid cage type rotor structure and winding method
  • Brushless doubly-fed machine hybrid cage type rotor structure and winding method
  • Brushless doubly-fed machine hybrid cage type rotor structure and winding method

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Embodiment Construction

[0039] The current research shows that as the number of short-circuit rings in the rotor nest increases, the modulation effect of the rotor magnetic field increases, and the harmonic leakage reactance and resistance of the rotor decrease. When the number of short-circuit rings exceeds a certain number, the rotor core tends to be saturated and the rotor impedance decreases. The magnitude is also gradually reduced. With the increase of the number of short-circuit rings, the spacing of the short-circuit rings in the rotor nest is not equal, the current distribution of each short-circuit ring is unbalanced, and the magnetomotive force of the cage rotor winding is not sinusoidally distributed, which contains abundant useless harmonic magnetomotive forces. Moreover, due to the uneven distribution of rotor current, the equivalent cross-sectional area of ​​the rotor conductor becomes smaller and the equivalent resistance is larger, which not only reduces the utilization rate of materia...

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Abstract

The invention discloses a brushless doubly-fed machine hybrid cage type rotor structure and a winding method. The rotor core comprises a plurality of rotor nests evenly distributed along the circumference of the core, each rotor nest is constituted by a plurality of loops, the plurality of loops of each rotor nest are arranged from the inside to the outside, and at least two parallel coil groups are arranged in each rotor nest, and the coil groups are separated from each other and have no electrical connection; and at least one coil group is a series combination formed by the serial connection and self-closing of two or more adjacent loops. The cage type rotor can improve the operating efficiency and power factor or other operation performances of a BDFM prototype, the whole rotor is balanced in current distribution, the rotor magnetic potential tends to sinusoidal distribution, and the harmonic content is low.

Description

technical field [0001] The invention relates to a brushless doubly-fed motor, in particular to a hybrid cage rotor structure and a winding method for the brushless doubly-fed motor, and belongs to the fields of variable-frequency speed-regulating drive and variable-speed constant-frequency power generation. Background technique [0002] Brushless Doubly-Fed Machine (BDFM) stator generally has two sets of independent three-phase symmetrical windings with different numbers of poles embedded in it. The one directly connected to the power grid is called the power winding, and the one connected to the frequency converter is called the power winding. control winding. The two sets of stator windings generate rotating magnetic fields with different numbers of poles, and realize electromagnetic coupling through the rotor, thereby realizing the conversion of electromechanical energy. Therefore, the electromagnetic coupling capability of the rotor structure is the key factor to determ...

Claims

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Application Information

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IPC IPC(8): H02K1/26H02K3/12H02K3/28H02K15/09
CPCH02K1/26H02K3/12H02K3/28H02K15/09
Inventor 欧先朋韩力王茂林庄琼王斌
Owner CHONGQING UNIV
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