Drive systems |
New permanent magnet synchronous solutionsLeroy-Somer offers innovative motor-drive solutions at the forefront of commercially-available technologies. Permanent magnet synchronous motors are by definition non-slip motors.The rated speed is scrupulously applied at the drive shaft, optimising the application's energy consumption. Another major benefit of this technology in its application is the exceptionally high efficiency level. Because of the magnets, the rotor losses are non-existent, whereas they represent a third of the losses in a high-efficiency induction motor. Leroy-Somer’s permanent magnet synchronous motors are designed to be controlled by a drive. Their efficiency is not only better than that of IE2 asynchronous solutions with equivalent power, but is also much more stable when the speed varies. This difference in efficiency is as much as 12 to 15 points at half-speed. Thanks to this improvement in efficiency, the specific output power can be increased or the motor dimensions reduced. Depending on the power rating and speed, the frame size is reduced by 1 to 3 sizes compared to a conventional asynchronous solution. For example, a 230 kW AC motor at 4500 min-1 has a frame size of 315 mm. The LSRPM motor with the same characteristics has a frame size of 250 mm. This high specific output power therefore allows for new mounting options, such as coupling with a single flange for power ratings up to 170 kW, rather than 55 kW in asynchronous drives. Since Leroy-Somer’s permanent magnet synchronous motors are integrated directly in the machine, some transmission devices can be eliminated and the size and weight of the machine can be considerably reduced, all of which increase the energy savings.
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