GE NEMA Premium Efficient XsD Ultra Case Studies

Brand: GE

Model: NEMA Premium Efficient XsD Ultra

Type: Case Studies

More efficient and cost-effective high speed muller platform due to

GE motor technology

Foundries worldwide can ill afford any downtime of their mulling equipment.

One of the most common reasons for unscheduled maintenance is a failed

motor. The big challenge for motors in this system application is the variable

torques applied to them during operation.

Muller applications require full automation, high intensity, and high speed to

efficiently produce uniformly mixed molding sand used in the production of

close tolerance ferrous and non-ferrous metal castings.

The Simpson Speedmullor, which comes in seven models of up to 150 tph (tons

per hour) or 135 mtph (metric tons per hour), is an excellent solution to most

sand preparation requirements in medium to large-sized foundries.

In a typical muller application, the machine is brought to nominal speed. Then,

up to eight thousand pounds of sand is poured in over a matter of seconds

and the amperage required to take on this sudden load spikes to

accommodate the added torque. As the machine evens out the load, the

amperage drops a bit until the sand, water and bonding agent begin to

change the physical properties of the load in ways that dramatically increase

the torques required to prepare the molding sand.

The foundry environment is one of the toughest applications for the motors we

use. Ambient temperature in the shop reaches 40°C in a summer and dust is in

the air all the time. Motor’s insulation and bearings lubrication and sealing are

critical for this application.

With this rate of output and variable load application, motor performance is

critical. An important thing to realize is that motor designs from different

manufacturers are not alike. Subtle differences that make up the molding,

winding insulation, bearings and enclosure design can contribute greatly to

muller performance. GE’s Six Star Bearing System*, for example, features a

larger bearing chamber than other motors and offers more lubrication, which

helps maximize bearing life and contributes to GE’s cooler motor operating

temperature.

Boris Shiller is the Chief Mechanical Engineer for Simpson Technologies with

more than twenty five years of experience in mechanical equipment and

processing machines engineering and design.

Simpson Technologies

X$D Ultra

• 200 HP, 1800 RPM,

460V, 60Hz

• 250 HP, 1800 RPM,

3300V, 60Hz

Muller Application

X$D Ultra Motors

Foundry Muller Application

Simpson Speedmullor

case study

Parts: 1-800-458-0451

Motors: 1-800-541-7191

www.gepowerconversion.com

Power Conversion

GE NEMA Premium Efficient XsD Ultra Case Studies

GE NEMA Premium Efficient XsD Ultra Case Studies

GE NEMA Premium Efficient XsD Ultra Case Studies

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