小型フェライト磁石モーターの特性に及ぼす低温減磁の影響

概要

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Influence of low temperature demagnetization on the properties of small ferrite morter is studied for four sorts of anisotropic strontium ferrite field magnets. Demagnetization curve as well as semi-closed magnetic flux density of the magnets at room temperature show large changes with cooling temperature at 0〜-70℃. Effective magnetic flux in rotor also chages in proportion to that and is also relation to such properties of the motor as starting torque. Effective magnetic flux and starting torque of the motor at room temperature (20℃) show large decrease after previous cooling with a lowering of cooling temperature for the lowest coercive force of the magnets studied. On the contrary, that remains at a very little decrease for the highest coercive force. These mid-term changes which decrease from middle point of the cooling temperature is observed for the coercive force between the both. Influence of low temperture demagnetization on the properties of ferrite magnet motor presents in large for the magnet with lower coercive force. The suitable higher coercive force should to be selected for the magnet of anisotropic ferrite motor rather than the higher residual magnetic flux density as expected to be large posibility which is exposeed at the lower temperature.
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