Patent ID: 11624521

Abstract:
An electric motor includes a stator, a rotor, and a magnetic sensor. The stator has an iron core and a magnetic flux coil. The rotor has a rotary shaft and a cylindrical rotor magnet. The magnetic sensor has a sensor unit that outputs an electric signal based on an applied magnetic flux. The rotor magnet is disposed so as to face the iron core of the stator. The rotor magnet has a main magnet unit and a sensor magnet unit that is formed integrally with the main magnet unit and has an external diameter smaller than an external diameter of the main magnet unit. The magnetic sensor is disposed beside the sensor magnet unit. An outer circumferential edge of the sensor magnet unit is located farther away from the rotary shaft than a center of the sensor unit. The magnetic sensor is configured such that a center of the sensor unit and a center of the magnetic sensor do not match each other, and the center of the sensor unit is closer to the sensor magnet unit than the center of the magnetic sensor.