An excitation coil, an excitation coil structure and a motor

Abstract

The invention discloses an exciting coil comprising a framework. A coil body is wound on the framework and is divided into a first coil layer and a second coil layer, the surface of the first coil layer is a first coil surface, the winding width of the second coil layer is more than that of the first coil layer, and a second coil surface is formed between the first coil layer and the second coil layer. The exciting coil has the advantages that through change in an arrangement structure of an existing exciting coil and adoption of a superposition manner, magnetic flux depression between every two adjacent exciting coils in the conventional arrangement structure of the exciting coil is eliminated effectively, and the size of a high-capacity motor can be decreased; additional iron loss of the motor is reduced and motor system efficiency is improved.

Description

technical field [0001] The invention relates to the field of motors, in particular to an excitation coil, an excitation coil structure and a motor. Background technique [0002] The excitation coil is an important part of the motor, and its efficiency directly affects the performance of the motor. figure 1 Shown is the existing excitation coil structure, which is a single-layer rectangular structure. Further analysis shows that there is a magnetic flux sag between the excitation sides with the same current direction, which makes the fluctuation of the air gap magnetic field larger , introducing more high-order harmonics and increasing the iron loss of the motor system. In addition, the existing large-capacity motors are large in size and inconvenient to use. Contents of the invention [0003] The present invention overcomes the above-mentioned deficiencies in the prior art, and provides an excitation coil, an excitation coil structure and a motor capable of eliminating ma...

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Problems solved by technology

[0002] The excitation coil is an important part of the motor, and its efficiency directly affects the performance of the motor. figure 1 Shown is the existing excitation coil structure, which is a single-layer rectangular structure. Further analysis shows that there is a magnetic flux sag between the excitation sides with the same current direction, which makes the fluctuation of the air gap magnetic field larger , introduce more high-order harmonics, increase the iron loss of the motor system, and in addition, the existing large-capacity motors are large in size and inconvenient to use

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