| 摘要 |
PROBLEM TO BE SOLVED: To provide a motor capable of securing detection accuracy of a motor rotation angle by reducing the influence of a magnetic flux source except a magnet being a detection target of a magnetic sensor.SOLUTION: A motor comprises: a bias magnet 41 fixed to an end part of an output shaft 23; and a magnetic sensor 42 generating an electrical signal corresponding to the variation of a magnetic field with the rotation of the bias magnet 41. Power supply to the motor is controlled on the basis of the electrical signal generated by the magnetic sensor 42. The motor has a choke coil 32b for removing power supply noise. The choke coil 32b has a C shaped core 51 and a coil 52. The core 51 includes a core body 51a extending along the axis line of the output shaft 23 and first and second arms 51b and 51c coupled with two end parts of the core body 51a, respectively. The end parts of the first and second arms 51b and 51c on the side opposite to the core body 51a extend in the same direction and contact with the inner wall surface of a ferromagnetic material cover 34. |
