Abstract: Based on the complexity of analysis and calculation of magnetic behavior, an efficient method is put forward for the torque calculation of permanent magnetic gears. A formula is presented for computing the transmitted torque of radially polarized permanent magnetic gears by the equivalent current theory of permanent magnet. This formula, which is based on three – dimensional analysis, is verified using three – dimensional finite element method. The result shows the formula is accurate for torque calculation and is well suited for the parametric analysis and optimal design of permanent magnetic gears.

Key words: Permanent magnetic gears, Three-dimensional analysis, Torque