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Contrastive Analysis of Motor Formed Winding and Scattered Winding

Date:2022-06-14   Author:XINDA MOTOR

Armature coils can be divided into formed coils (ie hard windings) and scattered coils (ie soft windings) according to their structures and manufacturing processes. Most small-sized products use soft windings, while large-sized products use more hard windings. Soft winding and hard winding have their own advantages. Ms. participated in a brief explanation.

Hard Winding - Formed Winding

The armature coils of DC motors, large-sized low-voltage motors and high-voltage motors are mostly formed coils. The formed coils are generally made of insulated flat copper wires, which are easier to maintain a certain shape. The formed winding is composed of formed coils. The coils are processed into a relatively fixed shape before inserting the wires.


The most commonly used magnet wires for hard windings are enameled flat wire, silk covered flat wire and mica flat wire, etc. Magnet wires with different insulation grades should be selected for different voltage levels - low-voltage products generally use enameled flat wire, and will be used when necessary. Silk-covered flat wire, when the wire-covered flat wire is used, after the forming is completed, only a layer of polyester glass tape can be wrapped around the coil; for high-voltage motors of 6kV and below, silk-covered wire is used, and an appropriate number of layers of mica tape are covered after the coil is formed. ; For motors of 10kV and above, mica wire is used, and mica tapes are covered with several layers on the forming coil. Due to the requirements of insulation performance, in addition to the choice of magnet wire for motors with higher rated voltages, the number of mica tape layers wrapped in motor coils with higher voltages should be more.


Soft Winding - Scattered Winding

The soft winding is generally a scattered winding, which is wound with a single turn or multiple turns of a round electromagnetic wire. Commonly used in armature coils and excitation coils of small and medium-sized AC motors with operating voltages below 500V. The armature coils of AC motors include single-layer windings, double-layer windings, and single-layer windings.


The commonly used electromagnetic round wires are mainly enameled wires. According to the different heat resistance grades and different working conditions of the motor, the electromagnetic wires with different heat resistance grades and different paint film thicknesses should be used. For frequency conversion motors, special electromagnetic wires for frequency conversion motors should be used. .


The selection of the magnet wire has a great influence on the performance of the motor, so the magnet wire should be reasonably selected in the motor design stage. We do not recommend over-design or selection beyond the actual requirements, but also remind the designer that the selection should be based on the actual performance requirements of the motor. Magnet wire that meets the requirements.