Giant servomotors offer torques up to 3000Nm

A new series of IEC-compliant high-end servomotors takes advantage of recent technological developments in rare-earth magnets and ceramic bearings.

GE Fanuc Automation has a new series of IEC-compliant high-end servomotors and new models of high-end spindle motors that take advantage of recent technological developments in rare-earth magnets and ceramic bearings.

Alpha iS Series AC servomotors produce torques up to 3000Nm and increased maximum speeds compared with their predecessors, but with a reduced axial length.

New models in the Alpha iT AC spindle motor series offer more power output and increased maximum speeds.

The new motors bring enhanced benefits to machine tool builders and operators when used with the latest GE Fanuc i Series CNC controllers.

The GE Fanuc Alpha iS Series AC servomotors offer a range of torques from 2 up to 3000Nm, fully compatible with 230 or 400V supplies.

The high performance motors use the latest rare-earth technology magnets which offer more compact motors with very smooth rotation, increased torques and increased maximum continuous speeds up to 5000rev/min.

For example, comparing the new Alpha 30/4000is with the Alpha 30/3000i it replaces, the overall length is reduced by 39% while the maximum torque is increased by 25% and the maximum continuous speed rating is increased by 33%.

The two giant 400V AC servomotors are specially designed for large, heavy load machines such as electric presses and electric injection machines.

They are single motors producing a large torque and huge power.

The top-of-the-range Alpha 3000HVis is the world's largest synchronous servomotor with a maximum torque of 5500Nm and a stall torque of 3000Nm.

The maximum and rated power outputs are 440 and 220kW, respectively, with a maximum continuous speed of 2000rev/min.

The Alpha 2000HVis offers a maximum torque of 3800Nm and a stall torque of 2000Nm, with maximum and rated power outputs of 400 and 200kW, respectively.

A new large-capacity, energy-saving servo amplifier, the SVM1-360HVi, has also been developed to supply the largest 400V motors.

The design offers highly efficient cooling, to minimise the overall size of the amplifier, and reduced wiring during installation.

The largest motor uses 'quattro amplifier drive technology': four SVM1-360Hvi amplifiers, linked in parallel, feed four separate windings in the motor.

Pulse coder resolution of 1,000,000/rev is standard on the new Alpha iS servomotors, with a resolution of 16,000,000/rev optional.

These compact absolute pulse coders are also fitted with a 10min backup capacitor as standard, enabling changes to be made without position loss.

All Alpha is motors conform to the IEC60034-1 standard.

A number of models are available with water-cooling jackets, offering a stall torque increase of 50%.

The jackets can be retrofitted, and have been designed to allow easy maintenance of the motor.

The GE Fanuc Alpha iT Series of AC spindle motors has been enhanced with models featuring ceramic ball main bearings.

This has extended the range of maximum continuous speeds to 20,000rev/min, with continuous power ratings from 1.5 to 22kW.

The complete series now offers a choice of steel or ceramic bearings, with models operating at 230 or 400V AC.

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