Roller table motors offer long service life
17 January 2014
The Marathon LT range of roller table motors from Regal Beloit is engineered to cope with the harshest operating environment found in steel rolling mills.
The electrical design is extremely robust, enabling the motors to accommodate frequent instant drive reversals under load and to be able to sustain stall conditions for 20 minutes.
The LT motors are available in Frame sizes 100L to 315M, in 4, 6, 8, 10, 16 and 32 pole configurations. Ratings are 100kgm to 1000kgm and the safe stall time is certified to 20 minutes. The ability to create high-impulse torques has been built into the design for effective starting and reversing of large loads. Insulation is to Class F as standard, with an option to upgrade to Class H.
The motors are of cast iron construction, with epoxy paint exterior and interior, and rated up to IP66. Additionally, a rotating brass labyrinth shaft seal prevents water ingress at the shaft extension.
They are naturally cooled, as the ventilation fan of a forced draught design may compromise long-term reliability. Instead, the cooling fins that aid heat dissipation are deep to increase the cooling surfaces and radial rather than longitudinal, so that dust cannot easily build up. Thermistors, thermostats or RTD temperature monitoring is also available.
The LT motors have options for foot, flange and combined mounting, and the terminal box is designed for ease of use in the field.
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