Sensing device

A sensing device comprising:

• a stator including a stator tooth;
• and
• a rotor including a magnet,
• wherein the stator tooth includes a first stator tooth having a first radius and a second stator tooth having a second radius,
• wherein the first stator tooth includes a plurality of first teeth, and
• the second stator tooth includes a plurality of second teeth,
• the magnet includes a first pole and a second pole,
• the first tooth overlaps the second tooth in a radial direction from a center of the stator, and
• a second angle formed by two ends of the first tooth based on the center of the stator is the same as a third angle formed by two ends of the second tooth based on the center of the stator,
• wherein the first radius is greater than the second radius.

A sensing device comprising:

• a stator;
• and
• a rotor of which at least a portion is disposed in the stator,
• wherein the stator includes a stator holder, a stator body coupled to the stator holder, a first stator tooth disposed on the stator body, and a second stator tooth having a radius greater than a radius of the first stator tooth;
• the rotor includes a rotor holder, a rotor body coupled to the rotor holder, and
• a magnet coupled to the rotor body,
• wherein the first stator tooth includes a first body and a plurality of first teeth connected to the first body and spaced apart from each other,
• the second stator tooth includes a second body and a plurality of second teeth connected to the second body and spaced apart from each other,
• an N-pole and an S-pole of the magnet are alternately disposed,
• wherein the plurality of first teeth and the plurality of second teeth overlap in a radial direction,
• one pole of the magnet includes an outer circumferential surface having a first angle (Θ1) based on a center of the stator,
• the first tooth includes a first outer circumferential surface having a second angle based on the center of the stator, and
• the second tooth includes a second outer circumferential surface having a third angle based on the center of the stator,
• wherein the first angle is the same as the second angle.