Torque sensing apparatus having a two part housing arrangement and a plurality of protrusions on the stator holder arranged in between
A torque sensing apparatus comprises: a first casing comprising a first opening; a second casing comprising a second opening; a stator comprising a stator holder that is placed in the interior of the first casing and the second casing and at least one stator tooth that is secured to the stator holder; and a rotor that is rotatably disposed in the stator, wherein the stator comprises a protrusion facing the inner peripheral surface of the first opening.
1. A torque sensing apparatus comprising: a first casing including a first through hole;
a second casing including a second through hole;
a stator disposed between the first casing and the second casing;
a rotor disposed in the stator and including a ring magnet,
wherein the stator includes a stator holder and a stator tooth fixed to the stator holder, wherein the stator tooth is disposed to face outside a peripheral surface of the stator holder,
wherein the stator holder includes a first protrusion disposed through the first through hole,
wherein a diameter of the first protrusion is smaller than a diameter of the first through hole,
wherein the diameter of the first protrusion is larger than a diameter of an outer circumferential surface of the rotor,
wherein the stator holder includes a second protrusion protruded toward the second casing,
wherein the second casing includes a groove formed on an inner peripheral surface of the second casing, and
wherein the second protrusion is coupled to the groove.
2. The torque sensing apparatus of claim 1 , wherein the first protrusion includes a plurality of first sub-protrusions and the second protrusion includes a plurality of second sub-protrusions.
3. The torque sensing apparatus of claim 1 , wherein the first protrusion protrudes from the stator holder in an axis direction.
4. The torque sensing apparatus of claim 1 , comprising:
a collector connected to the stator tooth; and
a magnetic device configured to detect a magnetization level collected by the collector.
5. A torque sensing apparatus comprising:
a first casing including a first through hole;
a second casing including a second through hole;
a stator disposed between the first casing and the second casing; and
a rotor disposed in the stator and including a ring magnet,
wherein the stator includes a stator holder and a stator tooth fixed to the stator holder,
wherein the stator tooth is disposed to face outside a peripheral surface of the stator holder,
wherein the stator holder includes a first protrusion protruded toward the first casing,
wherein the first easing includes a first groove formed on an inner peripheral surface of the first casing,
wherein the first protrusion is coupled to the first groove,
wherein the stator holder includes a second protrusion protruded toward the second casing,
wherein the second casing includes a second groove formed on an inner peripheral surface of the second casing, and
wherein the second protrusion is coupled to the second groove.
6. The torque sensing apparatus of claim 5 , wherein the first protrusion includes a plurality of first sub-protrusions and the second protrusion includes a plurality of second sub-protrusions.
7. The torque sensing apparatus of claim 2 , wherein the first protrusion protrudes from the stator holder in an axis direction.
8. The torque sensing apparatus of claim 5 , further comprising:
a collector connected to the stator tooth; and
a magnetic device configured to detect a magnetization level collected by the collector.