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Connection method for unconventionality symmetric windings

A connection method, symmetrical winding technology, applied in the shape/style/structure of winding conductors, etc., can solve the unresolved problems of capacity, speed and voltage mismatch, capacity, speed and voltage mismatch, and failure to meet conventional winding symmetry conditions, etc. problems, to achieve the effect of ensuring superior performance, superior performance indicators, and expanding the scope of design

Active Publication Date: 2014-02-12
HARBIN ELECTRIC MASCH CO LTD +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At a certain speed, the number of branches is fixed, so there will be a contradiction between capacity, speed and voltage mismatch
When encountering the above-mentioned contradictions, the usual way is to take a detour, or change the turbine speed to force the turbine to deviate from the optimal operating area; or accept some unreasonable performance of the motor, which will reduce the economical efficiency of the power station
Both are expensive
[0004] For a motor with an odd number of pole pairs, the contradiction between capacity, speed and voltage mismatch cannot be solved by using conventional windings; if very symmetrical windings are used, the contradiction between capacity, speed and voltage mismatch can be solved, but the number of poles is not dependent on the number of branches Integer multiples, do not meet the symmetry conditions of conventional windings, so conventional windings cannot be formed

Method used

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  • Connection method for unconventionality symmetric windings
  • Connection method for unconventionality symmetric windings
  • Connection method for unconventionality symmetric windings

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Embodiment Construction

[0020] A connection method for unconventional symmetrical windings, characterized by:

[0021] 1) The number of winding slots is an integer multiple of the product of the number of branches and the number of phases;

[0022] 2) For integer slots, the number of slots per pole and phase is an even number, and the number of bars per branch is an integer multiple of the number of slots per pole and phase;

[0023] 3) For fractional slots, the numerator of the number of slots per pole and phase represented by an false fraction is an even number, and the number of rods in each branch is an integer multiple of its numerator;

[0024] 4) The number of wire rods constituting each branch is equal, the position of the magnetic field is the same, and each coil is an integral distance;

[0025] 5) In order to ensure that the magnetic field position of each branch line bar is the same, it is necessary to adjust the position of the line bar connected to the branch line. It only needs to mee...

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Abstract

The invention relates to a stator winding of an alternative current motor, and aims to disclose a slot number selection method and a winding connecting mode of unconventionality symmetric windings with a wide application range. To ensure that a winding outgoing line is positioned at one end, the relationship and specific requirements on the number of slots, the number of slots of each pole and phase, the number of branches and the number of phases are defined, the unconventionality symmetric windings can be wave windings, lap windings, integer slot windings and fraction slot windings, however, all the windings need to be connected in integral distance, and the number of wire rods of each branch distributed in each magnetic field position is the same. The connection method is applicable to stator windings of the alternative current motor, and is particularly applicable to pumped storage motors and stator windings of hydro-generators.

Description

Technical field: [0001] The invention relates to the connection method of unconventional symmetrical windings. Background technique: [0002] Hydrogenerators and pumped storage motors often encounter problems of mismatching capacity, speed and voltage. At this time, the motor will have problems such as inappropriate slot current, unreasonable performance parameters, difficult selection of generator outlet switchgear parameters, and difficult design of the main protection scheme, thus deteriorating the economy of the entire power station system. However, the speed of the motor is related to the number of poles, and its change is discontinuous, and the number of poles determines the number of branches of the conventional winding. At a certain speed, the number of branches is fixed, so there will be a contradiction between capacity, speed and voltage mismatch. When encountering the above-mentioned contradictions, the usual way is to take a detour, or change the speed of the t...

Claims

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Application Information

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IPC IPC(8): H02K3/28
Inventor 李金香蒋宝钢李桂芬胡刚林雪成王韬王立芳孙玉田
Owner HARBIN ELECTRIC MASCH CO LTD
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