IE4 super premium efficiency permanent magnet motors save energy

The PMSM series is an environmentally friendly range of motors, employing an efficient design of rotor that integrates embedded permanent magnets made from the rare-earth material, instead of the squirrel-cage rotor found in induction motors. This design offers a number of benefits. It reduces heat losses from the rotor by 100 per cent, total losses by approximately 25 per cent, and increases total efficiency by 10 per cent or more. For the PMSM user, this improved performance translates into lower total cost of ownership, a reduction in CO2 emissions, and ongoing savings that buffer against future increases in energy costs.

PMSM synchronous motors offer improved efficiency when compared with induction motors even under partial load conditions; and very high efficiency under rated operating conditions. They also have higher power density which, for geared motors, yields higher system efficiency with minimal installation volume - and also reduced weight. PMSM drives can produce higher torques for the same installation volume as conventional induction motors, a factor that allows cost saving through the ability to specify a smaller motor size in some applications.

Bauer has invested a considerable amount of design and development time into ensuring that its PMSM motor and drive packages deliver high-efficiency performance on partial loads, a criticism that has been levelled at other Permanent Magnet designs as the efficiency can drop-off sharply outside the ideal operating speed and load. Bauer's PMSM motors maintain high levels of efficiency within a wide partial load range, up to a load factor of 1:5.

Since the motors can deliver both efficiency and flexibility, the combination of these features with a compact size and high torque rating means that they can be used to cut inventory significantly for large plants and third party stock facilities. Offering a replacement for a variety of different asynchronous geared motors in the field can result in a further reduction in costs for inventory, logistic and maintenance.

Synchronous design

With a synchronous design, the PMSM motors are not only superior at converting electrical energy into mechanical power, but also offer the added benefit of maintaining constant speed independent of the load. This means that motor speed does not vary, despite overload variations, or cases of voltage drop, as long as the mains frequency is kept constant.

The PMSM motor series are available in ventilated and non-ventilated configurations across the power range from 0.55kW to 15kW. They operate on 380V to 500 V power supplies, and are rated for inverter duty, offering an extended speed range with constant torque.

Low operating and maintenance costs of the PMSM motors mean that they provide an energy saving drive for use on fans, pumps and compressors; and for constant torque applications such as elevators and conveyors. To find out more about Bauer's permanent magnet synchronous motors, visit the website at www.bauergears.com.