75 kW Pump Motor — Israel (Aquaculture & Water Systems)

The Challenge: Bearing Corrosion & High Replacement Costs

The customer is one of Israel’s largest water pump suppliers, serving aquaculture and industrial water systems worldwide. Motors suffered recurring bearing corrosion, premature failures, and higher maintenance frequency. Root-cause analysis pointed to shaft voltage and stray currents—common on VFD-driven pump trains. Imported grounding rings from established brands were considered, but unit cost blocked large-scale deployment across many systems.

Solution

Volsun recommended the VS-RDW 3rd generation shaft grounding ring, matched to motor specifications and duty. The design uses high-conductivity microfiber brush technology for continuous low-resistance shaft contact, supports a wide shaft compatibility range, targets low contact resistance for continuous operation, and is validated beyond the customer’s 1450 RPM requirement. Laser-engraved branding was also provided for OEM consistency.

Results

After rollout, bearing corrosion issues were addressed, service life improved, maintenance and replacement costs dropped versus the previously evaluated import option, and overall reliability improved—especially valuable where many pumps run unattended.

Highlights

• 75 kW, air-cooled low-voltage pump motor, 1450 RPM, humid continuous-duty environment
• VS-RDW 3rd generation shaft grounding ring
• Cost-performance suited to multi-unit deployment