With JMAG, it is possible to create a linear motor model that is detailed and conforms to a real machine, and that accounts for spatial harmonics and magnetic saturation characteristics included in a permanent magnet linear motor. Importing this linear motor model, a “JMAG-RT model,” to a circuit/control simulator makes it possible to run a linked simulation that accounts for the linear motor’s magnetic saturation characteristics and spatial harmonics as well as the driver’s control characteristics.
This Application Note presents how to use JMAG-RT to obtain the spatial harmonics and current dependency of the thrust and coil inductance, and import them to a circuit/control simulator as a JMAG-RT model. From there, it shows how to perform an analysis that controls the speed of the permanent magnet linear motor to the desired value. The system that creates a JMAG-RT model using magnetic field analysis is referred to as JMAG-RT.
Speed/ Mover position
The time variations in speed are shown in fig. 1 and the time variations in mover position are shown in fig. 2 for when there is a constant command value of 0.8 m/s. The fact that this linear motor is running at its command value of 0.8 m/s can be confirmed in that the speed oscillates around 0.8 m/s in fig. 1, and that the slope in fig. 2 is about 0.8.