Rubbing forces provide insights into PDM wear analysis

G. Robello Samuel EnerTech-Landmark Graphics Inc. Houston The wear on the shaft of a two-lobe motor can be clearly seen after several hours of operation. Wear is more pronounced along the seal lines (Fig. 1). Nomenclature [74,621 bytes] The degree of rubbing intensity provides insights into the design of the power section for positive displacement motors (PDM), helping to find new ways to increase operational efficiencies. The rubbing of the shaft against the housing elastomer results in the loss of useful power as caused by friction, leakage, swelling, and "bubble" of the elastomer. This results in troublesome wear ...

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