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High performance motor for OEM market

10 April 2008

A new high-performance motor intended for the OEM market that offers significant savings on running costs and space requirements that can be engineered to match customer applications has been introduced by Lafert. Savings on operating costs can amount to more than 80% whilst the motor’s far superior output to that of standard ac induction motors enables significant frame size reductions plus weight savings.

The new Lafert ‘High Performance’ motor combines the technology of both brushless permanent magnet motors and conventional ac induction motors. The ability to do this is facilitated by the fact the Lafert Group has both servo and ac induction motor knowhow in-house.

By combining these technologies, substantial efficiency advantages over conventional ac induction motors, including EFF1 and even Premium Efficiency machines, are achieved. This is manifested by constant and superior efficiency across the whole speed range and under variable load.

As with the brushless, permanent magnet, motors, the rotor of the Lafert HP motor has no losses. Also, stator currents are lower, consequently generating lower losses due to low current demand (Joule effect), which in turn results in reduced temperature rise for both the windings and bearings. These low temperature rises can go on to eliminate the need for a cooling fan and its related losses. Ultimately, the sum of these minimised heat gains provides the options of higher running speeds or extended bearing life.

The enhanced performance characteristics of the HP motor also permit Lafert to offer smaller frame size solutions and weight savings of around 50%.

All these features combine to enable engineers to achieve compact efficient drive solutions, particularly for such applications involving pumps, fans and compressors that are substantially more compact, lighter in weight and less expensive to run.

And all these benefits are provided from one development source due to Lafert’s in-house technology and the ability to harness the best from proven components such as the ac induction motor’s standard stator and the surface-mounted permanent magnet rotor from the brushless servo motor.

The new High Performance motors from Lafert are available for both single and three phase supply with ratings 0.75 - 2.2kW, 200 - 240V 50/60Hz and 0.75 - 22kW, 380 - 480V 50/60Hz, respectively.

The High Performance motor can be used with a standard servo drive when fitted with an appropriate transducer but, ideally, it should be used in conjunction with a sensorless drive developed by Lafert Drives to maximise the motors performance and superior efficiencies for the specific application.


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