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Characteristic Analysis of Claw-Pole Machine Using Improved Equivalent Magnetic Circuit

Magnetic field analysis of claw-pole machines using improved equivalent magnetic circuit (EMC) is presented in this paper. On the basis of 3-D geometry, improved EMC, which consists of magneto motive-force (MMF) source and permeance considering main and leakage flux distribution, is composed and field analysis is performed. Nonlinear characteristics of magnetic core are considered for precise analysis results. Three-dimensional finite element analysis (FEA) is performed to verify calculated results and flux density in rotor and stator areas are compared. In addition, calculated and experimental back-EMF versus MMF of field and rotor speed is compared. From the verification with calculated and experimental results, it is proved that improved EMC compared with 3-D FEA provided reasonable results in initial design of claw-pole machine having asymmetric structure.