Abstract
Permanent magnet field-type DC motors are used widely for many purposes because of such features as small size, light weight, high efficiency and the ease of the variable speed drive.Permanent magnet field-type DC motors are small motor, so that there are few reports with respect to evaluation of performance for optimum design.Therefore, this paper describes the evaluation of performance in regard to armature circuit inductance, demagnetization durability of permanent magnet and commutation characteristics.The results are summerized as follows.(1) The armature circuit inductance and the demagnetization durability of the permanent magnets fields can be calculated by magnetic field analysis using the finite element methods.(2) The commutation characteristics of permanent magnet field-type DC motors without commutating poles can be calculated by commutating analysis using the flux distribution at the neutral zone.(3) The armature circuit inductance can be increased by slotted-core armature and permanent magnet field with pole pieces.(4) The demagnetization durability of the permanent magnets fields can be increased by slotted-core armature and stator with splitted-yokes.It is proved that the measured results obtained by the trial machines have a good agreement with the analytical results.
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