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 the JMAG-RT to obtain the space 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 position of the permanent magnet linear motor to the desired value.
Response characteristic/Thrust Variation
Fig. 1 shows the mover position versus time, and fig. 2 shows the thrust force versus time. Fig. 1 shows the time taken for the mover to reach the command value. The JMAG-RT model accounts for the motor geometry, so the thrust varies according to the positional relationship between the mover and the slots.