Van der Graaf Drum Motor Features

Every Van der Graaf Drum Motor utilizes cast-iron gear housing and motor flanges. By choosing cast-iron over lighter cast-aluminum components, the Van der Graaf Drum Motor is able to withstand greater levels of belt tension over typical motorized pulley designs.

Drum motors are available in all mild steel and optional all stainless steel construction including end caps, shell, shafts and junction box.

The drum motor is designed with all vital components, such as motor and gear reducer rotating in an oil bath, sealed and isolated from the environment. Temperature generated from the motor and gear reducer is transferred through the oil to the drum and dissipates on the belt.

All electric windings are manufactured to inverter duty standards with rating of 1600v Corona Inception Voltage (C.I.V.) and Class F insulation 155°C with optional Class H insulation 180°C for applications where high temperature operation is required. The drum motor can be supplied with a variety of voltages, frequencies and phase. This wire allows for the motors to be used in conjunction with variable frequency inverters. The magnet wire itself has the ability of withstanding voltage spikes of 7,700 volts.

The drum motor incorporates high quality seals to ensure an oil leak free unit. Seals rotate on a hardened bushing to preserve seal life and extend durability. All Van der Graaf drum motors use a bolt-on design utilizing gaskets or 'o'-rings.

Our gears are manufactured using high alloy steel, machined and honed to AGMA/DIN 6 standards, reducing noise to minimal decibel levels. Low noise levels contribute to good working conditions and Van der Graaf units exceed OSHA low noise requirements.

Standard Van der Graaf motors have Class F insulation that allows a motor limiting temperature of 155° C. Class H is optional, which allows for a motor limiting temperature Class of 180° C. By providing a higher insulation Class, the electric motor is able to withstand a higher ambient operating temperature. The drum motor has a 80°C temperature rise.