Epoxy Powder Coating Machine (stator insulation)
AutomatedSemi-automatic
Coats the slots and end faces of small stator cores with an insulating epoxy layer (fluidized bed or electrostatic), replacing slot liners.
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Selection criteria
Coating thickness control, masking of the bore and tooth tips, preheat and cure temperature, cycle time.
Supply chain
Dongguan and Foshan builders make electrostatic powder coaters for small-motor stator and rotor cores, often together with curing ovens. Check bore masking accuracy (powder on the tooth tips eats air gap) and coverage in the slot corners.
Buyer FAQ
- Powder coating or plastic end insulators?
- Powder coating gives a thin, continuous insulation layer (0.25–0.45 mm) that follows the slot shape, leaving more room for copper and conducting heat better. Moulded end insulators plus slot liners cost less to set up and are easier for low volumes or frequent design changes.
- Electrostatic spray or fluidised bed?
- Electrostatic spraying of a preheated core gives better thickness control in slots and suits automatic lines. Fluidised-bed dipping is simple and builds thicker coats but needs more masking and post-cleaning.
- What are the critical checks?
- Coating thickness at slot corners (the thinnest point), no powder on the air-gap surface, full cure (solvent rub or DSC) and dielectric strength with a probe or brush test.
Where it is used
Motor assembly process
- 42 mm Two-phase Hybrid Stepper Motor (NEMA 17)2. Stator insulation
- 57 mm Two-phase Hybrid Stepper Motor (NEMA 23)2. Stator insulation
- 37 mm Brushed DC Gear Motor (spur gearbox)2. Shaft, commutator & core insulation
- 70 mm Outer-rotor BLDC Motor2. Stator powder coating