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High-power motors marry servo and induction benefits

13 April, 2007

Rockwell Automation has developed a range of high-power motors that combine the efficiency and low cost of simple induction motors, with the precision of servo motors. The Allen-Bradley High-Power Kinetix HPK-Series motors are designed for applications such as materials handling or web conversion requiring up to 150kW of power.

Rockwell says it has achieved the high level of performance by optimising the motorís winding design to mimic the speed/torque curve of permanent magnet servo motors. This allows the machines to deliver a peak torque that is twice the continuous torque when running at base speeds.

The motors are equipped with single- or multi-turn, high-resolution absolute feedback, eliminating the need for time-consuming homing routines, improving velocity regulation, and expanding the system`s inertia-matching capacity. Rockwell claims that this is a new capability for induction motors, making the HPK-Series machines the first of their kind to offer positioning, acceleration and productivity capabilities that are comparable to traditional permanent magnet servo motors.

"We`ve never offered a servo motor in power ranges over 30hp (22kW), but the HPK motor extends the normal power range of a traditional servo motor up to 200hp (150kW)," says Rockwell product manager, David Hansen. "This allows machine builders to increase acceleration and improve the positioning, precision and overall system throughput, in some cases as much as 25%.

"Regardless of whether you specify the North American standard of 460V AC or the European standard of 400V AC, the performance of the HPK-Series motors is fully optimised when they are paired with Allen-Bradley Kinetix 7000 high-power servo drives," Hansen adds. "As this integration increases among the controllers, drives, motors and actuators across the plant floor, so will machine flexibility and efficiency."

The 460V versions of the motor, available in five frame sizes, provide continuous stall torques from 96-482Nm, and peak torques from 964-2,192Nm.

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