Lafert is launching a high-performance motor for the OEM market that is said to offer significant savings on running costs and space requirements by being engineered to match customer applications.
Savings on operating costs can amount to more than 80 per cent while the motor's superior output to that of standard ac induction motors enables significant frame size reductions and 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 can be gained over conventional ac induction motors, including EFF1 and even Premium Efficiency machines. This is manifested by constant and superior efficiency across the whole speed range and under variable loads.
As with the brushless, permanent magnet, motors, the rotor of the Lafert HP motor has no losses. In addition, stator currents are lower, consequently generating lower losses due to low current demand (the Joule effect), which, in turn, results in reduced temperature rise for both the windings and bearings. These lower temperature rises can help 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 sizes and weight savings of around 50 per cent.
All these features combine to enable engineers to achieve compact efficient drive systems, particularly for applications such as those involving pumps, fans and compressors.
The new High Performance motors are available for both single- and three-phase supplies with ratings of 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, Lafert says it should be used in conjunction with one of its own sensorless drives to maximise the motor's performance and superior efficiencies for the specific application.
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