Patent ID: 6768977
Filing Date: 2004-07-27
Classification: G11B,H02P

Abstract:
A circuit model for use in analyzing a VCM, comprising:a first current loop comprising elements modeling a VCM coil; and at least one second current loop inductively coupled to said first current loop for modeling eddy current effects created in metallic parts of said VCM in proximity to said VCM coil, wherein said first current loop comprises a model of a first resistor, a model of a first inductor, a model of a second inductor and a model of a BEMF voltage source, in series between models of first and second input nodes, wherein said at least one second current loop comprises: models of third and fourth inductors, and a model of a second resistor, connected in a first series loop of said second loop, to model eddy current effects of top metallic parts of said metallic parts, and models of fifth and sixth inductors, and a model of a third resistor, connected in a second series loop of said second loop to model eddy current effects of bottom metallic parts of said metallic parts.