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Method for modifying double layer winded performing winding into Y-Delta mixed performed winding

A technology for hybrid forming and forming windings, which is applied in the shape/style/structure of winding conductors, electric components, and the manufacture of motor generators, etc. It can solve the problems of low level of high-voltage motors and difficulty in improving the efficiency of high-voltage motors.

Active Publication Date: 2009-02-11
TSINGHUA UNIV +1
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Problems solved by technology

[0005] The present invention aims at the problem that the efficiency of high-voltage motors in my country is difficult to improve, and proposes a method for realizing Δ-Y hybrid windings applied in high-voltage large and medium-sized asynchronous motors. The purpose is to improve the efficiency and performance of high-voltage asynchronous motors, and help solve the The problem of low level of high-voltage motors in my country

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  • Method for modifying double layer winded performing winding into Y-Delta mixed performed winding
  • Method for modifying double layer winded performing winding into Y-Delta mixed performed winding
  • Method for modifying double layer winded performing winding into Y-Delta mixed performed winding

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specific Embodiment approach

[0032] The key of the present invention is the determination of the wire gauge, the number of coil turns and the number of parallel branches in the Y connection and the Δ connection part. The method flow is as follows: figure 1 shown. The specific implementation is as follows:

[0033] 1. Know the data of the original three-phase winding, including the following parameters:

[0034] Number of parallel branches a 1 , the number of parallel wires n, the number of slots per pole per phase q, the number of series turns per phase N φo , the point angle α between two adjacent slots, the fundamental wave winding coefficient k dp1 , wire width b and thickness a, wire cross-sectional area A c , pitch y, number of stator slots Q 1 and the number of pole pairs p of the motor;

[0035] 2. Let the current of the original ordinary three-phase winding wire be I 1 , the current density is J, and the conductor cross-sectional area is A c ,but image 3 Medium Y part phase current I AY...

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Abstract

The invention relates to a method for changing a double-layer lap-winding winding to Y-delt connection mixed winding. The method is characterized in that the method comprises the steps of calculating the section areas of a Y-connection winding conductor and a delt-connection winging conductor, and determining the number of branches connected with each other in parallel, the number of turns of the coil and the width and the thickness of a wire on the basis of the prior double-layer lap-winding windings. In consideration of the manufacture cost of the motor, other parameters and the size of the motor are kept original values when changing to the Y-delt connection mixed winding, but the size of a stator groove needs to be adjusted correspondingly according to the wire gauge and the number of turns of the coil without changing the groove area. The winding has improved winding coefficient and can weaken harmonic waves with higher harmonic contents such as the fifth and the seventh harmonic waves, thereby increasing the wire gauge, reducing the number of turns, lowering the motor loss, and improving the motor efficiency and the power coefficient. Additionally, the Y-connection and delt-connection coils are arranged in a non-alternate manner so as to reduce the process difficulty. The method suits the alteration of common double-layer lap-winding winding of high-voltage large and medium asynchronous motor with a power lower than 2,000 kW.

Description

technical field [0001] The invention relates to a method for rewinding the double-stacked forming winding of a high-voltage large and medium-sized asynchronous motor into a Y-Δ connected hybrid forming winding, belonging to the technical field of high-voltage and high-efficiency asynchronous motors. Background technique [0002] The electric motor is an electrical equipment that consumes the most electricity in today's industrial and mining enterprises and daily life. According to statistics, the electric energy consumed by electric motors in the United States, Japan, France and Russia accounts for more than 60% of all industrial electric energy consumption, while in my country, only the electricity consumption of three-phase asynchronous motors accounts for the total electricity consumption. more than 60% of the amount. The main reason is that the energy utilization rate of my country's motor drive system is about 20% lower than the international advanced level, especially ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K3/28H02K15/04
Inventor 汪书苹赵争鸣冯垚径
Owner TSINGHUA UNIV
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