Electric Oil-Cooled Motorised Pulleys and Permanent Magnet Pulleys
Motorised pulley is a steel drum ( as used in a conventional pulley) however the drum rotates around the shaft – but the shaft does not move
The rotating drum acts much like a traction pulley so that it can grip and drive the belt
The electricity needed is sent through the shaft to controls within the pulley. Since the shaft end does not rotate, there is no need for slip rings to deliver electrical energy to the motor windings.
The internal mechanism — motor, gears, and bearings — is completely sealed and protected by the outer metal drum.
- Before running, the sections inside are filled with an appropriate lubricating fluid, the fluid continuously lubricates the bearings and gears as well as, acts as a coolant to remove heat from the motor. This oil keeps the motor cool, extends service life, and reduces maintenance.
- With the drive mechanism inside, a motorized pulley is more compact than a conventional drive system and reduces space requirements.
- Safety is improved as all moving parts and electrical connections are completely enclosed within the drum.
- Servicing a motorised pulley is an oil change according to the manufacturer’s specifications. – This allows for service periods to be about once every year if the machinery runs about 24 hours a day, every day for one year
These motorised pulleys have a much-reduced noise level due to moving sections being contained within the outer shell that is sealed and oil-filled
OHS – as the sound intensity is equivalent to that of conversation, there is no need to wear ear protective devices, as specified by OSHA guidelines and requirements, when near the area
- Efficient Motorised pulley runs to high efficiency with a greater than 90 % of horsepower transferred directly to the conveyor belt.
Permanent Magnet Pulleys
Notes On The Break-In Period For Drum Motors
There are several things to be aware of during the break-in period when new equipment is first used, usually referred to as the break-in period, in order to ensure that the equipment is used to good effect.
1. Leakage Occurs
Due to the looseness, vibration, and heat of the drum motor parts, leaks can sometimes occur on the sealing surfaces and pipe joints of the equipment.
2. Fast Wear And Tear
Due to factors such as processing, assembly, and commissioning of new equipment parts, sometimes the contact area of the mating surface is small and the permitted torque is large; therefore, the concave and convex parts of the surface of the drum motor are embedded and rubbed against each other during operation, so the metal debris from the grinding down will continue to participate in the friction as abrasive, which accelerates the wear of the mating surface of the parts.
3. Poor Lubrication
As the clearance of the newly assembled parts of the drum motor is small, then it is not easy for the lubricating oil to form a uniform oil film on the friction surface to prevent wear due to assembly and other reasons; this tends to reduce the lubrication efficiency, making the equipment cause early abnormal wear of the machine parts.
4. Looseness Occurs
Newly machined and assembled parts often have deviations in geometry and fitment size, and in the early stages of use the drum motor is subject to alternating loads such as shock, vibration and heat, deformation, and other factors, as well as rapid wear and tear, which can easily loosen the original fastened parts.
By paying more attention to these aspects during the break-in period, problems can be identified and solved as early as possible, thus avoiding breakdowns in use and affecting the normal use of the equipment.