Permanent-magnet synchronous motors for pumping, ventilation, compression, conveyors, extrusion, processes, generator applications
The innovative design of the magnet rotor increases efficiency by almost 10% to levels approaching 98%. The size reduction is of the order of 50%. This type of motor is intended for applications for which electricity consumption is high and continuous. This means that in a very large number of cases the time to return on investment for replacement of an asynchronous motor by LSRPM will be less than one year. As motors account for more than 70% of the electrical energy consumed in industry, this new product line also contributes to the essential objectives of CO2 emission reduction.
Outstanding efficiency and compactness The use of variable speed and the optimisation of mechanical systems are the main routes to achieving maximum savings. At the cutting edge of commercially-available variable speed technologies, this range brings together all of their variable-speed controller and permanent-magnet synchronous motor solutions.
The performance is based on radial-magnet rotor technology. By reducing rotor losses, this technology enables efficiencies of about 98% to be achieved and increases the power-to-weight ratio of the motor. This advantage is not only valid at rated speed, but is greater below the rated speed, which is the case by definition in variable-speed applications!
The comparison with conventional motors depends on the application. In the specific case of a screw compressor driven initially by a variable-speed system based on a 2-pole asynchronous motor with IP23 rated enclosure, shaft height 315 mm and power 280 kW, the efficiency under variable-speed control is 92.7%. The permanent-magnet synchronous motor achieves an efficiency under variable-speed control of 97.6% over a speed range from 0 to 3000 min-1. The energy saving exceeds 4000 /year and the weight of the motor is reduced from 900 to 380 kg. The time to return on investment compared with the conventional solution is less than 12 months.
The mechanical systems of the series have IEC IP55 rated enclosures, the most widespread in industry. The characteristics of the range are:
– power 0.75 to 400 kW
– torque 1 to 1400 N.m
– speed 1 to 5500 min-1
– shaft height 90 to 315 mm.
High torque and speed performance
With guaranteed torque over very wide speed ranges, without derating or forced ventilation, it is also the simple and effective solution for applications demanding high torque at high speeds. The motor is designed to run faster than an asynchronous motor, enabling:
– the motor speed to be matched to the speed of the machine being driven, eliminating transmission components such as step-up gearboxes,
– increased performance of the machine being driven, by increasing its speed.
Integration and maintenance facilitated
The compactness gives it a number of advantages: reduced size of the chassis supporting the motor and thus of the client machine, easy on-site installation of the motor, simpler lifting gear, lower transport costs, etc.
The modularity of the series, free-standing configuration, or flanged with plain or tapped holes, and the many associated options, facilitate the replacement of installed conventional motors. The low losses of the magnet rotor technology considerably limit winding heating. This reduces the frequency of bearing lubrication and lengthens the life of the motor. The fields of application and use of motors are as extensive as those of asynchronous motors: pumping, ventilation, compression, conveyors, extrusion, processes, generators, and many others.
