Is a coreless motor a distributed winding or a concentrated winding?

Coreless motors use a distributed winding (wave winding) structure.

Winding Type Description: The windings of a coreless motor are directly fixed to a coreless cup-shaped rotor (usually an epoxy resin skeleton). The windings are distributed at a specific angle to form a closed loop, which is a special form of distributed winding (often called wave winding or self-supporting winding). This design is fundamentally different from traditional concentrated windings (such as concentrated stator slot winding).

Key Differences from Concentrated Windings:

1. Structural Characteristics: Distributed windings are evenly distributed around the circumference of the rotor cup, without core slot constraints; concentrated windings are wound on the salient pole teeth of the stator core.

2. Performance: Due to the absence of a core and distributed windings, coreless motors have no cogging effect, low inertia, and high response speed (millisecond level), while concentrated winding motors typically have cogging torque and slower response.

3. Application Scenarios: Coreless motors are used in precision control applications (such as drone servos and medical devices); centralized windings are more common in cost-sensitive or high-torque applications (such as home appliances and industrial drives).

Technical Parameter Basis: According to the 2023 product manuals of major coreless motor manufacturers such as Maxon and Faulhaber, the winding process is clearly marked as "ironless coreless winding," an optimized variant of distributed winding. The current national standard GB/T 30549-2019, "Naming Method for Micro-motors," also classifies coreless windings as a distributed type.

Precautions: During maintenance, avoid direct contact with the coreless windings (thickness typically <0.5mm) to prevent deformation that could permanently degrade motor performance.