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Idam0415technical articles

With the new Torque motors RIB series Idam offers thermally optimized direct drives for higher productivity and lower energy consumption of machine tools. Due to improved heat transfer, they can operate with 12% more maximum torque or with 30% less heat dissipation compared to the RI series, depending on the operating strategy. The engines are interchangeable with the corresponding predecessor models RI and largely compatible with the usual engine sizes.

The active magnet length can be adapted to the application in 25 mm increments and the resulting space can be optimally utilized. The motors are optimized for locking force and can be used on most control systems. The functional principle of RIB motors is currently also being transferred to a new linear motor. First L7 concept engines show significantly higher drive power or correspondingly less power loss.

Optimized heat management

The two operating strategies of electric motors "hot" or "cold drive" are particularly interesting for the design and use of a machine tool. The name given for cold and hot is the desired temperature in the thermally steady state of the drive in the machine. A hot drive is ideal for mass production, where the axis to be designed represents a bottleneck in production. Following the manufacturing process, the drives are designed so that maximum space is used and the highest drive power is used for the process. In later continuous operation, the motor runs close to its power limit and thus also at the thermal limit. On the other hand, when the engine is cold, the engine is deliberately oversized. The advantages are obvious: The motor temperature or the heat loss of the motor is significantly lower, the system accuracy increases and the higher torques make it easier to follow, for example, with 5 axis machining of a contour. As a result, surface quality and dimensional stability increase. The disadvantage of this variant is usually a slightly higher price.

If it is now possible to significantly reduce the heat transfer resistance in the engine, the result is not only a much cooler engine but also a thermally more robust system. The maximum possible power that can be cooled out of the engine increases. In practical terms, this means that engines can be driven with more power (design strategy hot engine) or the reserve is deliberately used for efficiency improvement (design strategy cold engine).

More drive power and less power loss

Translating the heat transfer optimizations from the rotary RIB engine to a linear motor means developing a whole new generation of motors. This is tracked in the linear motor concept L7. Currently, in the first calculations and tests, an increase of the driving force by approx. 7% and a reduction of the heat loss up to 40% are apparent. A precision cooling in the engine is not necessary. The magnetic circuit has been optimized for best synchronization. Options such as three cable outlet variants, thermal decoupling of the motor and secondary section cooling round off the series.

An example of a five-axis milling machine with direct drives shows that investing in these new RIB and L7 series not only increases manufacturing precision but is also financially attractive. If all linear and torque motors are replaced by the RIB or L7 concept motors, 30% utilization in three-shift operation reduces the heat losses from 17 to 11,5 kW in the main feed axes. This corresponds to an annual saving of 7,2 t CO2 or 14,4 MWh, equivalent to 2160 Euro at 15ct / kWh.

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Pepperl + Fuchs