Linear Motor 

For

Float Tin Bath

Linear induction motors are being used to control the flow of molten tin in float baths, promising significant benefits in glass quality.

New Type Linear Motor---12 poles with suspended rail 

The tin bath serves several functions. Not least of these is removing heat from the molten glass ribbon, which bas to be transported away from the glass and dispersed within the tin. For this and other reasons, control of tin flow within the tin bath can be a useful addition to the process control regime.

LIMOT systems uses a linear induction motor, mounted on a carriage, accompanied by a transformer and control panel. The motor itself comprises a long, water-cooled beam with the motor head mounted on one end. The other end of the beam is mounted on a 4-wheel carriage. The motor is comprised of a laminated stator with several windings of copper tubing inlaid in it. It is enveloped in a refractory casing that protects it from the heat within the tin bath. The copper tubing serves to carry both water and power from the transformer to the motor.

	Specifications for Limot-12: 　 12 poles Overall Length: 5335mm Head: 1380 x 260 x 150 mm
	Specifications for Limot-06: 　 6 poles Overall Length: 4735 mm Head: 670 x 260 x 150 mm

With the beam inserted through the side seal of the tin bath, the lower face of the refractory casing lies just above the glass ribbon. With the motor on, the molten tin below the glass is forced to move. Both the direction and velocity can be readily controlled by adjusting the electrical inputs. Adjusting the height of the motor above the surface of the glass adjusts the depth of penetration of the motor’s effect into the tin.

Linear induction motors are frequently used at the inlet end of the bath. They control the transverse temperature distribution across the bath by maintaining transverse tin flows from the center towards the sides of the bath. Done in the attenuation region and the shoulder area of the bath, they can minimize optical distortion in the eventual glass ribbon by creating thermal homogeneity in the molten tin supporting the glass ribbon, and at the exit end of the bath for de-dross by attracting liquid tin flowing into the de-dross pockets at the sides of the bath then back to the bath through sunk holes.

The limot-06T linear motor for de-dross Two linear induction motors are installed on de-dross pockets situated at each side of the bath. They propel polluted tin into the de - dross pockets, forcing clear molten tin out of the submerged outlets of the pockets back into the bath. The dross accumulates in the pockets and can be raked out periodically.