Sensor magnet assembly and motor

A sensor magnet assembly fixed to a shaft included in a motor including a rotor in which the shaft is disposed along a central axis and a stator facing the rotor in a radial direction with a gap therebetween, the sensor magnet assembly comprising:

• a fixing member that has a cylindrical shape extending in an axial direction and is fixed to one side end of the shaft in the axial direction;
• and
• a sensor magnet fixed to an outer circumferential surface of the fixing member;
• wherein
• the fixing member includes a first groove recessed inward from the outer circumferential surface of the fixing member in the radial direction and having an annular shape extending in a circumferential direction and a plurality of first recesses recessed inward from the outer circumferential surface of the fixing member in the radial direction and spaced apart along the circumferential direction;
• the plurality of first recesses are disposed at positions different from the first groove in the axial direction, and the first groove and the plurality of first recesses are disposed in a portion of the outer circumferential surface of the fixing member, to which the sensor magnet is fixed;
• and
• the sensor magnet includes a portion positioned inside the first groove and a portion positioned inside the first recess.

A sensor magnet assembly fixed to a shaft included in a motor including a rotor in which the shaft is disposed along a central axis and a stator facing the rotor with a gap therebetween in a radial direction, the sensor magnet assembly comprising:

• a fixing member with a cylindrical shape extending in an axial direction and is fixed to the shaft;
• and
• a sensor magnet fixed to an outer circumferential surface of the fixing member;
• wherein
• the fixing member includes a plurality of first recesses recessed inward from the outer circumferential surface of the fixing member in the radial direction, the plurality of first recesses are spaced apart along a circumferential direction and disposed in a portion of the outer circumferential surface of the fixing member, to which the sensor magnet is fixed;
• and
• the sensor magnet includes a portion positioned inside the first recess and a bottom surface of the first recess is a flat surface orthogonal or substantially orthogonal to the radial direction, both of two side ends of the bottom surface of the first recess in the circumferential direction are connected to curved surface portions positioned at two sides of the first recess in the circumferential direction in the outer circumferential surface of the fixing member.