This type rotor varnish trickling machine is mainly used for motor rotor coil insulation automatic processing. Except for manually loading and unloading, the entire process is fully automated so as to guarantee product consistency and the quality for mass production.

Question and Answer of Electrical bike hub motor stator aseembly dip varnish machine:

Specification for Dip Varnishing for Hub motor Stator Assembly

Stator Assembly Sizes: As shown in above picture, Stator assembly overall sizes are;

Stator OD: Max 275 mm, Stator ID (Bore): 25~30 mm with 5 mm key slot

Stator Thickness: 100 mm max. You can check the video and know the stator is without shaft, we need the stator thickness

Stator weight: Max 3.5 Kgs

Production rate: 400 / shit of 440 minutes

Varnish Grade: Dobeckan FT 1040/120E, Hardner K2

Preheating: Stator copper Winding is to be heated by passing electric current to rise the

temp inside winding to 120 Deg. @ Centre of the winding within 2 minutes. Current & time

shall be programmable and is to be controlled within +/-5% of set value. Temp measurement

on winding surface is needed to setup the current and time

The preheating is by air heated motor,don’t need to coil pass current

Varnish Process: Stator will be dipped inside varnish tank after preheating. Part is to be

rotated while dipping for 1~2 rotations which shall be settable. Take the parts out of varnish

tank and keep it rotating for 6~8 minutes to settle the varnish. Dipping can be accomplished

by moving parts inside tank or moving tank upside to dip the parts.

Some arrangement is needed to wipe out excess varnish from outer diameter of the stator.

The varnish is thin as video showed and don’t need to wipe out

Post curing: Parts to be post cured for 25 ~30 minutes @ temp of 130~150 Deg. During the

post curing, parts shall be rotated inside oven to avoid varnish spill over outer diameter.

Post curing can be accomplished by conveyor arrangement or batch type oven.

Oven temp is to be maintained by PID controller with interlock for time and temp. Proper ventilation is to be provided to avoid any fumes or pressure built inside the oven.

Cooling: Force cooling arrangement to be provided to cool the parts to below 60 Deg.

Supplier to provide machine specifications in terms of cost, overall size, connected load and

proposal drawing.

According to stack height and weight,each shaft can hold 2 to 3pcs stator,

And your output target is 400pcs per day, the machine overall size will be around 7.5meter

(1) Specification