Generator

Generators in wind turbines are subject to high vibration loads. This additional permanent load has a negative influence on the cages and places strain on the lubricant.

• High speeds
• High temperatures
• High vibration loads
• Risk of the passage of current

Animation: Bearing damage due to the passage of current

Damage due to the passage of electrical current

Current passage causes serious bearing damage and thus leads to premature, unexpected failure of a motor or generator:

• Craters caused by melting
• Molten droplets
• False brinelling
• Discoloration
• Micro-wear
• Premature aging of the lubricant
• Noticeable noise behavior

Animation: Longer operating life due to current insulation

Longer operating life due to current insulation

Current-insulating bearings prevent damage due to the passage of electrical current and thus ensure lower maintenance costs and higher machine availability.

All current-insulating bearings have the same dimensions and load carrying capacities as those without insulation, which makes them perfectly interchangeable.

Advantages

• Highly wear-resistant insulating layer
• Breakdown voltage up to 5,000 volts DC
• Also suitable for damp environments
• Good conductor of heat
• Interchangeable with standard bearings

Features

• Aluminum oxide ceramic layer
• Different coating types are available for optimum functional performance

Advantages

• Maximum protection against passage of electrical current
• Low wear in the rolling contact
• Longer bearing and grease operating life
• Suitable for high speeds
• Good emergency running characteristics
• Rolling elements are resistant to chemicals
• Interchangeable with standard bearings

Features

• Hybrid bearing
• Ceramic rolling elements
• Same dimensions as standard bearings