Based on voltage level, windings can be divided into high-voltage windings and low-voltage windings. For AC motors, high-voltage windings refer to various AC stator windings with voltage levels of 3kV and above, while stator windings, pole windings, and armature windings of other small motors, as well as DC motor armature windings, belong to low-voltage windings.
From a manufacturing process perspective, windings can be classified into single-turn and multi-turn windings. Single-turn windings include stator windings for large AC motors, armature windings for DC motors, insert rotor windings, compensating windings, damping windings, and equalizing wires, while multi-turn windings include embedded windings, shaped stator windings, and pole windings for small and medium-sized AC motors.
Based on their structure and manufacturing methods, motors can be divided into flexible windings and rigid windings. Flexible windings are made of insulated round wire and are commonly used in small, semi-closed-slot motors with operating voltages not exceeding 500V. AC motor flexible windings are classified by the number of layers: single-layer windings, double-layer windings, and mixed single-double-layer windings. Common forms of DC motor flexible windings include lap windings and wave windings. Rigid windings consist of shaped coils made of insulated flat wire or conductor bars. Depending on the embedding method, they can be divided into embedded and inserted types.
Inter-turn insulation refers to the insulation between the turns of a single coil. Its function is to separate conductors with different potentials in the motor windings to prevent short circuits. This category includes the inter-turn insulation of armature coils and compensating coils. Because the potential difference between inter-turn insulation is small, its thickness is relatively thin. Generally, inter-turn insulation relies solely on the insulation inherent in the electromagnetic wire itself, such as enameled wire, single-glass-insulated or double-glass-insulated wire, etc. For inter-turn insulation of main pole and commutating pole coils wound with flat copper wire, options include: glass-coated cloth, raw cloth, flexible composite materials, or flexible mica board. Inter-turn insulation is the most important and often the weakest insulation in a motor's insulation structure. Therefore, careful material selection is crucial when designing inter-turn insulation. During manufacturing, care must be taken to ensure the wires are smooth and free of burrs or sharp edges, and to prevent mechanical damage to the inter-turn insulation.
Disclaimer: This article is a reprint. If it involves copyright issues, please contact us promptly for deletion (QQ: 2737591964). We apologize for any inconvenience.
