Features

Minimum Maintenance - Maximum Reliability.

Low speed synchronous motors running at pinion speed eliminate the need for interposing gearboxes. No gearbox, no lube unit, no high and low speed couplings.

Eliminates the possibility of damage to driven equipment.

The drive train, through the use of a clutch, is protected against damage from high transient torques due to short circuit fault currents.

Saves Energy Costs.

Quadramatic™ synchronous motors can provide leading VARs for power factor correction and power system support. This can reduce the size of your generating plant, and the cost of purchased energy.

Quadramatic™ is a GE invention.

The Quadramatic™ System has an excellent operational performance record spanning over 30 years.

The Quadramatic™ Drive extends all the benefits of a single pinion, air-clutch connected, low speed synchronous motor drive to the 25,000 HP range with twin pinion drives. Two pinion drives become necessary when the horsepower required to drive an ore reduction mill exceeds a single pinion’s drive capacity.

The Quadramatic™ drive is comprised of two low speed, low inrush, brushless, synchronous motors driving through two airclutches to two pinions connected by a common ring gear. To achieve an even lower inrush level, reduced voltage starting can be used. A special clutch pulsing technique was developed, on initial load sharing, to bring the two motor rotors into near equal load angles. Quadratorque™ motors then maintain load sharing by continuously, and automatically, adjusting for load differences between the two.

The Quadramatic™ Drive system ensures continuous electrical load sharing and automatically adjusts for gear runout and system damping. This increases uptime while avoiding expensive part purchases.

The inherent advantages of synchronous motors include: highest system operating efficiency for fixed speed applications, rugged mechanical construction, less stringent air cleaning requirements, large air-gaps that make mechanical alignment less critical, and freedom from heavy, full power collector systems such as sliprings and commutators. This means less costly capital spares are required.

GE Quadramatic™ synchronous machines are fully Vacuum Pressure Impregnated (VPI) with epoxy resin. These machines are fully assembled and tested in the factory prior to shipment.

Pulsation torque is eliminated since the motors are started and accelerated unclutched. Motors are also brought up separately to decrease the electrical draw.

Low inrush synchronous motors reduce the power system disturbance during motor starting. In most cases, the Quadramatic solution is the only one that eliminates the need for a soft starter component.