STK RANGE OF FRAMELESS BRUSHLESS SERVOMOTORS Since the early 90's, ALXION is well known to be an uncontested specialist of Direct Drive motors with its FC motors range. This built-in range of motors "ready to use" is the ideal solution for printing machines, bending machines, or machine tools, which require an excellent regularity of rotation especially at very low speed and a very high accuracy with a hollow shaft available up to 70 mm. With the STK range, ALXION addresses direct drive applications that could not be satisfied with the FC • The applications needing a full integration of the motor in the servomechanisms due to volume and weight criteria ; - The applications needing a high diameter crossing hollow shaft demanding a ring type technology. MAIN CHARACTERISTICS: •Continuous torque from 14.6 Nm up to 2708 Nm in natural convection and up to 6100Nm in fluid cooling depending on the size. • Six external diameters from 145 mm up to 800 mm. ■ Internal diameter from 56 mm up to 630 mm. -Various available windings from 30 rpm up to 1500 rpm depending on the size. The range of permanent magnets brushless motors ALXION STK has been specially designed for the direct drive of axis without gears needing very low volume and weight regarding the torques and powers to be Therefore, both electromagnetic and thermal optimisation have^ allowed to reach continuous torque-to-weight up to 15 Nm / Kg in natural convection and up to 30 Nm / Kg in fluid cooling However, the range of frameless motors ALXION STK addresses very demanding industrial applications in terms of performances (dynamics, compacity, accuracy in regularity at low speed), in reliability but also in terms of costs. A particular attention has therefore been dedicated in the design so that a mixed optimisation could be achieved. On another hand, the industrial unsatisfied by direct drive motors because they are generally torque motors getting therefore a reduced power and speed. ALXION got the ambition to answer that objection with the STK range by creating motors that could satisfy the low speed applications with their related speed regularity and also to address the direct drive applications up to 30 KW in natural convection and 100 KW in fluid- cooling with speed reaching up to 1500 rpm, The various speeds can be reached thanks to several windings versions. Some of them are illustrated in that catalogue but numerous winding versions allowing to optimise the drive current rating iron laminations MOTOR CONSTITUTION bearing the windings and fixed housing. The windings are encapsulated Housing is either smooth either grinded for bearing the engravement of the cooling circuit when it is • Output cable class 6 with 4 shielded wires for • Thermal protection by PTC resistor and linear resistor KTY84 embedded in the winding. Output cable class 6 with 2 shielded pairs. ROTOR: Rare earth magnets protected against corrosion are stuck around a magnetic iron ring.

STATOR AND ROTOR MOUNTING Optionally STK armatures and rotors can be shipped mounted on a centering and positioning flange for avoiding the user to make the operation of mounting and centering the rotor inside the stator. OPERATION IN NATURAL CONVECTION The armature is the source of both current losses and hysteretic and eddy current losses. It will be necessary to take it into account for integrating the motor. Here are the main elements to be taken in consideration: - Permanent torques of the motors are indicated for a copper temperature rise of 120°C for armatures in contact with ambient air...

• Various positioning sensor interfaces: the drives can be compatible with 4 kinds of positioning interfaces: - Resolver: The resolvers are in the best cases (ALXION resolver RES FC6 72 32) limited to an accuracy of 1 arc minute. In most of the resolvers available on the market, accuracy is rather around several minutes. It will be necessary to check whether the desired positioning accuracy is compatible with the resolver accuracy and also the electronic resolver-to-digital circuit. On another hand, the resolvers limit the applications due to the crossing hollow shaft. The resolvers ALXION RES...