抄録
In the permanent magnet (PM) synchronous bearingless motors, radial suspension force components in two-perpendicular axes are mutually interfered by the armature reaction. Then, the magnetic force suspension system has less damping, and it causes unstable rotor suspension with large displacements. In order to eliminate the suspension force interference, some decoupling control methods of the PM bearingless motors have been already proposed. In the decoupling controllers, it is necessary that the radial force parameters are justly identified. The parameters may be varied with the armature reaction or the magnetic saturation in the stator teeth. In this paper, the salient-pole type PM bearingless motors are focused. At first, the parameters are calculated by FEM. However, some problems are found in the FEM parameter identification from a view point of suspension performances of three prototype machines with different structures. Then, a new on-line parameter identification strategy is proposed, and the new strategy is found to be suitable in identification of the parameters considering the armature reaction and the magnetic saturation.
