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What are the types of bearings are adopted for small motors and large motors?  

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Small motors (LT motors)

Horizontal mounted – deep groove ball bearing at both ends. 

 Medium motors

Roller bearing at DE and deep groove bearing at NDE.

Large motors (HT motors above 750 kW) 

 Horizontal mounted – sleeve bearing (pedestal) cooled by lub oil.

Vertical mounted – face to face angular contact ball bearing at NDE and roller or ball bearing at DE.

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