Classifying motor windings is a very interesting topic; different classification methods can yield different results for the same thing. Of course, motor windings are no exception. Ms. Can will have a brief discussion with you today.
1. A classification method for motor windings
Motor winding coils can be divided into two types: formed coils and loosely wound coils. Formed coils refer to coils that are pressed into a fixed shape using molding equipment. Once pressed, the shape, size, pitch, and other inherent characteristics of such coils cannot be changed. Loosely wound coils, on the other hand, refer to coils wound using a winding mold. The shape and size of their conductors can be adjusted significantly according to the actual site conditions.
Generally speaking, shaped coils are used in the windings of large and medium-sized motors, and their insulation strength is better than that of loosely wound coils. This is mainly due to the special properties of the electromagnetic wire used.
Generally, motors with a center height of 315mm or less mostly use loosely wound coils. Due to the limitations of their core diameter and length, the internal space is relatively narrow. Using loosely wound coils is beneficial for end shaping after winding, but their slot fill factor is relatively low, resulting in greater losses and lower power.
With each conductor insulated, the formed coil will have one or more layers of insulation added after winding. After being shaped by forming machinery, its size is not easily changed.
Loose-wound coils are more suitable for mass production, while molded coils are affected by the molding machinery, resulting in a smaller daily output.
2. Brief Introduction to Enameled Wire
Currently, my country has over a thousand enameled wire manufacturers, with an annual production capacity exceeding 300,000 tons. However, the overall situation of my country's enameled wire industry is characterized by low-level repetition, summarized as "high output, low quality, and outdated equipment." Under these circumstances, high-quality enameled wire for home appliances still needs to be imported, let alone compete in the international market. Therefore, efforts should be redoubled to change this situation, enabling my country's enameled wire technology to catch up with market demand and gain a foothold in the international market.
Enameled wire is a major type of winding wire, consisting of a conductor and an insulation layer. The bare wire is annealed and softened, then coated with enamel multiple times and baked. However, producing products that meet both standard requirements and customer demands is not easy. It is affected by factors such as raw material quality, process parameters, production equipment, and environment. Therefore, the quality characteristics of various enameled wires differ, but they all possess four major properties: mechanical, chemical, electrical, and thermal properties.
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