STK RANGE OF FRAMELESS BRUSHLESS SERVOMOTORS FOR DIRECT DRIVE0 pages

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STK RANGE OF FRAMELESS BRUSHLESS SERVOMOTORS

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FOR DIRECT DRIVE

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Since the early 90's, ALXION is well known to be an uncontested specialist of Direct Drive motors with its

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FC motors range. This built-in range of motors "ready to use" is the ideal solution for printing machines,

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bending machines, or machine tools, which require an excellent regularity of rotation especially at very low

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speed and a very high accuracy with a hollow shaft available up to 70 mm.

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With the STK range, ALXION addresses direct drive applications that could not be satisfied with the FC

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range:

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• The applications needing a full integration of the motor in the servomechanisms due to volume and

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weight criteria ;

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- The applications needing a high diameter crossing hollow shaft demanding a ring type technology.

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MAIN CHARACTERISTICS:

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•Continuous torque from 14.6 Nm up to 2708 Nm in natural convection and up to

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6100Nm in fluid cooling depending on the size.

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• Six external diameters from 145 mm up to 800 mm.

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■ Internal diameter from 56 mm up to 630 mm.

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-Various available windings from 30 rpm up to 1500 rpm depending on the size.

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The range of permanent magnets brushless motors ALXION STK has been

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specially designed for the direct drive of axis without gears needing very

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low volume and weight regarding the torques and powers to be

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developed.

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Therefore, both electromagnetic and thermal optimisation have^

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allowed to reach continuous torque-to-weight up to 15 Nm / Kg

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in natural convection and up to 30 Nm / Kg in fluid cooling

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However, the range of frameless motors ALXION STK

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addresses very demanding industrial applications in

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terms of performances (dynamics, compacity,

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accuracy in regularity at low speed), in reliability

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but also in terms of costs.

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A particular attention has therefore been

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dedicated in the design so that a mixed

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technical and economical

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optimisation could be achieved.

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On another hand, the industrial

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users can be sometimes

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unsatisfied by direct drive

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motors because they are

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generally torque motors getting

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therefore a reduced power and

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speed. ALXION got the ambition to

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answer that objection with the STK range by

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creating motors that could satisfy the low speed

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applications with their related speed regularity and

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also to address the direct drive applications up to 30

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KW in natural convection and 100 KW in fluid-

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cooling with speed reaching up to 1500 rpm,

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depending on the size.

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The various speeds can be reached thanks to

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several windings versions. Some of them are

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illustrated in that catalogue but numerous winding

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versions allowing to optimise the drive current rating

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can be easily achieved.

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iron laminations

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to the external

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in resin.

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MOTOR CONSTITUTION

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ARMATURE: It is consistent of

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bearing the windings and fixed

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housing. The windings are encapsulated

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Housing is either smooth either grinded for bearing

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the engravement of the cooling circuit when it is

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requested.

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• Winding in H class.

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• Output cable class 6 with 4 shielded wires for

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the power.

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• Thermal protection by PTC resistor and linear

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resistor KTY84 embedded in the winding.

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Output cable class 6 with 2 shielded pairs.

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ROTOR: Rare earth magnets protected against

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corrosion are stuck around a magnetic iron ring.

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