Bearing Protection Services

We offer the following services to help prevent electrical bearing damage:

• Bearing Cutting and Inspection

• Shaft voltage testing

• External AEGIS® Installation

• Internal AEGIS® Installation

Your Bearings Can Fail from VFD-Induced Shaft Currents

VFDs allow large energy savings and precise control. But they also generate electric voltages on motor shafts. These shaft voltages can discharge through the bearings, causing pitting, fluting, and eventual bearing failure.

Protect Your Bearings with AEGIS®

AEGIS® Shaft Grounding Rings are the leading bearing protection technology. They protect bearings by giving shaft voltages a “path of least resistance” to ground, so the shaft discharges through the ring, not the bearing. Unlike other shaft grounding products, AEGIS® rings are long-lived and maintenance-free, and can be installed inside or outside of the motor.

Contact Malloy for a Free Copy of the AEGIS Bearing Protection Handbook

Malloy offers several EASA motor service centers that offer leading edge technology and highly trained personnel. We provide “best cost” solutions for your electric motor service needs. The motor service team is dedicated to service, quality, and quick turnaround to minimize disruptions for our customers. With locations in four states, Malloy offers the widest service area within our geographic region.

Service Capabilities:

• AC/DC Motor Repair and Refurbishment

• Low Voltage AC Motors

• Medium Voltage AC Motors

• High Voltage AC Motors

• DC Motors

• Synchronous Motors

• Generator Repair and Refurbishment

• Slip Ring Repair and Refurbishment

• Rewind – Utilizing Class H Insulation Systems

• UL Explosion Proof Motor Recertification

• Lifting Capability of 70,000lbs

• 8’ VPI Tank

• Load Test Capability

• Full Voltage Testing to 7.2 KV

• Core Loss Testing

• Thermal Image Analysis

Malloy tests the electrical condition of the Winding Circuit(s) for Motors and Generators with our static Motor/Generator Analyzers. These electrical tests can be performed in our service centers or onsite at the customer’s facility.

We utilize the following Static Motor and Generator Analyzers:

• Baker D12R (Capable of testing up to 12 kV)

• Baker D12R with PP185D (Power Pack increases capability of testing up to 30 kV)

• PdMA MCETM (Capable of testing up to 5 kV)

The Baker D12R presents the following tests:

• Resistance (Phase to Phase)

• Insulation Resistance (Phase to Ground)

• DC HiPot (High Potential)

• Set Voltage:

  • Up to 12 kV (D12R)

  • Up to 30 kV (PP185D)

  • Dielectric Absorption (D.A.)

    • Up to 12 kV (D12R)

    • Up to 30 kV (PP185D)

    • Polarization Index (P.I.)

      • Up to 12 kV (D12R)

      • Up to 30 kV (PP185D)

      • Surge (Phase to Phase) Testing

        • Up to 12 kV (D12R)

        • Up to 30 kV (PP185D)

        • Field Resistance

        • Field Resistance to Ground

The PdMA MCETM offers the following tests:

• Resistance (Phase to Phase) with Unbalance Percentages

• Inductance (Phase to Phase with Unbalance Percentages

• Circuit Ground Capacitance

• Insulation Resistance (Phase to Ground)

• Dielectric Absorption (D.A.)

  • Up to 5 kV

  • Polarization Index (P.I.)

    • Up to 5 kV

    • Step Voltage (High Potential)

      • Up to 5 kV

      • Rotor Influence Check on Electrical Circuit

      • Field Inductance

      • Field Resistance

      • Field Resistance to Ground

Malloy can provide an Electronic (PDF) Copy of these results for the “As Found” and “As Left” conditions of the Electric Circuits. By testing the condition of Motor/Generator Circuits, we can help diagnose potential issues that could cause a failure during future operations and prevent it!

Description of Semiannual Tests for Electrical Motors

Utility and Industrial customers alike have large AC Induction, Synchronous and Wound Rotor Motors that have been running in their respective facilities for many years. When such a machine fails, finding a drop-in replacement can be almost impossible. At Malloy, we love tackling these tough motor application issues. Along with an adapter base, our Motor Team provides a suitable motor with like features and design characteristics. The Adapter Base raises the new motor up to the correct shaft height and utilizes the existing motor’s foot print. This motor/base package provides a true “drop-in” replacement for our customer.

Malloy’s extensive motor inventory now includes medium voltage motors up to 2000 HP. The demand for medium voltage motors is growing and Malloy has made the commitment to provide the right motors for many industrial medium voltage applications. Along with medium voltage motors Malloy offers medium voltage drives to provide the perfect system.

Motor
Current Medium Voltage motors in stock:

SIEMENS

800 HP 1800 RPM WPII 5810S 4160 V

900 HP 1800 RPM WPII 5810S 4160 V

1000 HP 1800 RPM WPII 5810S 4160 V

1500 HP 1800 RPM WPII 5812S 2300 / 4160 V

1750 HP 1800 RPM WPII 5812S 2300 / 4160 V

2000 HP 1800 RPM WPII 5812S 2300 / 4160 V

GE General Electric

500 HP 1200 RPM WPII 5011LL 4160 V

500 HP 1800 RPM TEFC 5011LL 2300 / 4160 V

Drives

TMEIC

1750 HP Variable Torque or Smaller 4160 V NEMA 1 Enclosure

1000 HP Constant Torque or Smaller 4160 V NEMA 1 Enclosure

Major Medium Voltage Lines Include:

• ABB

• General Electric

• Siemens

• TMEIC

• Toshiba

We can customize our medium voltage inventory to match your specific needs!

NEMA Motor Standards