Superior Design

Low Vibration

Reduced vibration was achieved by designing the motor to have a large separation between the frame natural frequency and line frequencies, exceeding API standards. Rigid feet utilizing class 30 cast iron, offers solid mounting and a high degree of safety factor during the starting cycle of the machine.

Inverter Duty / Reliability

VFD applications are best served by these machines with strict adherence to NEMA MG1 part 31 and IEEE-522 figure 2 (or figure 1 if requested). The QuantumTM LMV can include an insulated opposite drive end (O.D.E.) bearing with a shaft grounding brush, which decreases the possibility of circulating shaft currents. A top mounted blower may be offered based on motor application requirements.

Meets API 541 4th Edition and API 547 for Petroleum & Chemical Applications

Vibration and total electrical/mechanical run out levels meet stringent API standards, which translates to increased motor uptime and an improved overall reliability. Efficiency and load are tested via IEEE-112 method B.

The frame was designed with 7 “D-Ducts”. This unique shape dramatically increases airflow for a cooler operating motor at a lower, more versatile shaft height.

Rotor Construction

The standard construction is aluminum bar, copper bar is available when required for API or when specified by the customer. Rotor has multiple oversized vents for maximum cooling yielding a low temperature rise. The rotor and internal fan are shrink-fit onto the shaft meeting API specifications.

A stiff frame and increased foot strength leads to a lower vibration and increased horsepower capability.

Insulation Construction

More than 30 years of successful field experience proves the reliability of the insulation system. In addition to providing the necessary electrical insulation, this system meets all the stringent mechanical and thermal requirements found in modern applications. QuantumTM LMV products use an epoxy solventless resin vacuum-pressure- impregnation (VPI) process to unite superior insulation materials into a complete insulation system assuring long life. For line voltages of 5000 Volts and above, a semi-conducting armor is applied to the slot portion and graded beyond the core to provide corona protection. The binding agent used in this case is GE's third generation epoxy resin, selected and tested to IEEE-429 and IEEE-1043. The coils receive a protective armor of heavy glass tape for protection against mechanical shock and abrasion.

GE's Custom Polyseal insulation system is also available upon request. Custom Polyseal is a sealed winding insulation system which meets NEMA MG1 1.27.2 and passes the test criteria for 12.62 and 20.18. It is designed to meet severe operation conditions and have resistance to moisture penetration, oil, chemicals and salt water.

GE’s unique coil brace construction enhances the rigidity of the end turns leading to a longer coil life.

Bearings

Self-aligning spherically seated sleeve bearings per DIN 31693 are available for all ratings and are standard for all 2 pole ratings. Ball bearings are standard for all other speeds. Roller bearings for belted applications are available as well.