Experiment, simulation and analysis of linear direct current motor for control

Rotating permanent-magnet motors are now in common use in industry. These machines have a good dynamic performance, especially used for position control. In this paper, the authors consider a new design of a linear direct current motor (LDM), which uses permanent magnets in the rotor. This paper seeks to confirm that this motor achieves similar performance characteristics compared to its rotating counterpart. Two different types of control methods are used to investigate the performance of the motor, namely constant damping force control and position and velocity feedback control. A comparison is made between a three phase version and a six phase version. The boundary element method (BEM) is used to develop and solve for the fields of the LDM. This information is used to model the LDM, which is then used to simulate the control performance of the motor. The simulation results are compared to measured results.