直接驱动技术――力矩和直线电机为重型机床提供了全新的机遇

 FAG公司 展位号：H15-G17

    IAN依纳机电公司马达负责人Wolfgang Heinrich先生认为：要想充分利用直线电机或力矩电机的优点，必须优化整个机器的结构。

Direct drives
Linear and torque motors offer new opportunities in heavy machinery
Direct drive technology has been entering a number of sectors over the past few years. There has been constantly growing demand, particularly in machine tools, thanks to its excellent technological properties. Currently, the most disparate motor principles with suitability for the most dissimilar applications are on the market, making it difficult for potential end users to make the correct choice.
The company INA-Drives & Mechatronics GmbH & Co. OHG (IDAM), offers a wide range of linear and torque motors. It is building on the know-how of the companies LAT and Prech, which became IDAM.
Direct drives are generally used with a very rigid technical set of goals. Usually these are demands following an increase in machine dynamism, increased accuracy, reliability or simplification of the entire machine set up.
The required technical properties are not automatically met by simply substituting a direct drive for a conventional drive. n order to bring out the full advantages of a linear or torque motor, in most cases the optimisation of the entire construction is required,?says Wolfgang Heinrich, head of motor development at IDAM.
Not every type of motor is so suited for certain tasks, which makes the selection of the correct type decisive for the realisation of a task.
In general, the following trends can be observed:
c The requirement for a large dynamic area, which means the use of very slow as well as very fast motions with the same direct drive.
c An increase of the system accuracy, for example, in positioning or in the form of processing true to contour.
In many cases, these trends occur at the same time.
During the development of new motors, IDAM thus concentrated on the following factors: Reduction of heat production, improvement of the synchronisation relationship, improvement of linearity, improvement of the motor structure and windings for the highest relative speed and an increase in the power and torque yields.
襂n any case, this is associated with the optimisation of the magnetic circuit as well as the entire motor structure,?Heinrich says. ecause it is hardly possible to unite all the technical goals in one motor, different lines of motors and types with different advantages were developed.?IDAM now makes a very wide range motor types, both in linear and rotational areas. ronless motors are especially dynamic, have excellent synchronisation and do not load the guide with starting force,?Heinrich says. onversely, the typical slotted motors have higher power recovery, are more robust, easier to cool and are very suitable for even moving large amounts of mass.?An inexpensive compromise between these types is often the slotless motor with a so-called air gap, says Heinrich. Along with its own range of motors like LI, ULIM3 to 7 and FSM, which are used in handling, the measuring unit sector or in roductronik? the L2 motor has been developed for use in heavy machinery, says Heinrich. It is a one-way motor comprising a primary and secondary part (magnetic rail).
Heinrich says the magnetic circuit structure has been optimised so that the motor provides very good synchronisation. oth the cogging and as well as the active load pulsation were reduced to below 1% of the nominal forces.?An option of two separate cooling systems is available for the motor. The heat transfer in the machine body could be significantly reduced with performance and precision cooling. In addition, the motor has a very high power density of 10 N/cm2 and a very linear force progression.  rs
c FAG Kugelfischer AG & Co. OHG,
www.fag.de, Hall 15, Booth G17

n order to bring out the full advantages of a linear or torque motor, in most cases the optimisation of the entire construction is required,?
says Wolfgang Heinrich, head of motor development at IDAM.

Photos: FAG