| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotational angle detector capable of suppressing the temperature increase of a magnet.SOLUTION: A rotational angle detector 13 includes a magnet 130, and a magnet holder 131. The magnet holder 131 includes a radiation fin portion 131c on an outer circumferential surface thereof. Owing to this, even if heat generated by carrying a current to a rotor winding is transferred to the magnet holder 131 via a rotary shaft, it is possible to release the heat by the radiation fin portion 131c to suppress a temperature increase of the magnet 130. It is thereby possible to suppress degradation of rotational angle detection accuracy to accompany demagnetization of the magnet 130.SELECTED DRAWING: Figure 4 |
