小型フェライト磁石モーターの特性に及ぼす界磁磁石特性の影響

概要

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Four sorts of strontium ferrite magnet are manufactured for magnetic field of small ferrite motor reconstructed from practically used, and studied concerning to the influence on properties of the motor. Relation between the torque of motor and rotation number as well as armature current was recognized to good coincidence with the results calculated from the theory. The higher effective magnetic flux of the field magnet causes the higher starting torque of the motor, and the highest starting torque was obtained at the highest residual magnetic flux density in the magnet. In these small ferrite magnet motors, the operation point of permanent magnet comes to considerably near side of residual magnetic flux density from the point of around maximum energy product as ideal condition for permanent magnet due to limitation of structure. As the result, the ferrite magnet with rather higher residual magnetic flux density than higher maximum energy product becomes to necessity in order to get the higher effective magnetic flux to the higher starting torque. It is concluded that the ferrite magnet motor should be designed about the magnet material, the shape and the size under consideration of these conditions.
大同工業大学の論文