The Magnetic Impulse Gravity Impact rapper, developed and patented in the 1950's by Research-Cottrell,
has become the most widely used rapper for cleaning the collecting curtains of electrostatic precipitators.
Many have copied the MIGI rapper, but few have duplicated the features incorporated into and improved from
the original design. Nor have others demonstrated the durability of a similar product via insitu operation
such as Hamon Research-Cottrell has done with the MIGI rapper.
The MIGI rapper is a general use rapper that is ideal for most applications. The MIGI is capable of delivering
strong shearing forces to remove even the most tenacious of dusts from collecting curtains and rigid mast
designed high voltage systems.
Hamon Research-Cottrell's original Model LV-1 MIGI rapper was developed with simplicity,
low maintenance and long life in mind. These factors remain the focus of our MIGI design.
The Hamon Research-Cottrell MIGI is still ruggedly built with a coil assembly of 13 AWG copper
wire wound on a 1/8" wall phenolic tube. The coil assembly is mounted on a cast iron junction
box and protected by an all steel housing.
The original Hamon Research-Cottrell MIGI rapper can deliver a whopping 24 ft.-lbs of force using
its only moving part, a 20-lb. stainless steel faced plunger. Rapping force is easily adjusted
via control input and/or physical adjustments to rapper height.
The flange mount design allows the Hamon Research-Cottrell MIGI to be retrofitted to most top-rap
designed precipitators with relative ease. The MIGI has also been fitted to precipitators originally
designed with mechanical rapping.
The lower cost Model LV-4 MIGI is also available.
