Linear PM Machines Research Articles

Linear Vernier Machine with Permanent Magnets only on Armature Side

The conventional linear PM machines can be classified into the type which has armature on mover or the type which has it on stator. In either type it requires to lay the armature windings or the permanent magnets over a long distance in the application for long distance movement. It leads to high cost. Therefore, we proposed a linear vernier machine with the magnets only on armature side. This paper describes the theoretical proof and introduces comparisons of computed and experimental results. The comparisons agreed well. The prototype machine for the experiment had a problem due to less accuracy in assembly but we think it is not difficult to solve the problem.

Research on Combinations of Primary and Secondary Pole Numbers for Linear Switched-Flux PM Machines with Odd Pole Number of Primary

Based on a simple analytical model, combinations of primary and secondary pole numbers for linear switched-flux permanent magnet (LSFPM) machines with odd pole number of primary are compared, with respect to back electromotive force (EMF) and electromagnetic thrust force. The winding configurations are also determined according to the coil-EMF vector diagram. Based on optimized LSFPM machines, some basic electromagnetic performances are compared in LSFPM machines with 9 primary poles. It is shown that the secondary pole number should be close to the primary pole number and the higher secondary poles can lead to a better performance.

Analytical Modeling of Flat and Tubular Linear PM Machines with Surface-Mounted Magnets and Semi-Closed Slots

Analytical Modeling of Flat and Tubular Linear PM Machines with Surface-Mounted Magnets and Semi-Closed Slots

Dynamic range evaluation of linear permanent magnet machine through design parameters estimation and continuous motion

In the case of the manufactured linear permanent magnet synchronous machines (PMLSMs), dynamic range evaluation for system efficiency and performance limits is difficult to accomplish because of the moving length restriction with mover and the absence of interface between the design field and control field. To solve this problem, this paper presents a dynamic analysis based on design parameters by magnetic field analysis of the linear PM machine. And then, maximum operating range of the system is estimated considering the control method of a fixed dc-link voltage of the inverter. This analysis is verified from the dynamic experiments through continuous progressive motion of the manufactured disk-type PMLSM by current control.