Conveyor motor in a drum

Jan. 7, 2014

The Drum motor from Van Der Graaf, Shelby Township, Mich. is a one-component conveyor drive with the ac-induction motor, gear drive, and all moving parts enclosed in a rugged drum. The motor and gears operate in a sealed oil bath, ensuring proper lubrication. Heat from the motor and gears also gets transferred through the oil to the drum where it is dissipated by the moving conveyor belt.

There are no external components, reducing maintenance and improving safety. The motor and gearbox are also sealed in the drum, so they can operate in extremely harsh environments. The drum also protects the equipment from high-pressure detergent and water washdowns. The single-unit design saves space as well.

Standard drum motors are available in mild or stainless steel, in nine diameter sizes ranging from 4 to 20 in. The gear housing and motor flanges are cast iron, which lets belt tension be much greater than on conveyor drives with motorized pulleys.

Electric motors are available in voltages and frequency suitable for most applications. The motor range in size from 0.11 to 200 hp, with corresponding belt speeds from 3 to 2,000 fpm. Extreme-duty motors are also available in sizes from 20 to 31.5 in. in diameter, and from 15 to 200 hp. The motors can be specified with an optional electromagnetic brake (for units 4.5 to 16 in. in diameter). The brake can withstand duty cycles of up to 40 stops/min.

See the Drum motor in action and hear more about its performance and construction at

Sponsored Recommendations

Pumps Push the Boundaries of Low Temperature Technology

June 14, 2024
As an integral part of cryotechnology, KNF pumps facilitate scientific advances in cryostats, allowing them to push temperature boundaries and approach absolute zero.

The entire spectrum of drive technology

June 5, 2024
Read exciting stories about all aspects of maxon drive technology in our magazine.


May 15, 2024
Production equipment is expensive and needs to be protected against input abnormalities such as voltage, current, frequency, and phase to stay online and in operation for the ...

Solenoid Valve Mechanics: Understanding Force Balance Equations

May 13, 2024
When evaluating a solenoid valve for a particular application, it is important to ensure that the valve can both remain in state and transition between its de-energized and fully...

Voice your opinion!

To join the conversation, and become an exclusive member of Machine Design, create an account today!