Haptic actuator with linear and rotational movement
Disclosed is an actuator generating haptic sensations, the actuator having a spherical rotor driven by a magnetic force vector created around the same, a stator having a space corresponding in shape to the spherical rotor defined therein to allow the spherical rotor to be positioned in the space and having a portion of an upper part of the spherical rotor exposed, at least three rotation-driving coils formed in the stator at a given distance from each other to provide the magnetic force vector to the spherical rotor, and a driving unit independently controlling electric current supplied to each of the rotation-driving coils to create the magnetic force vector.
1. An actuator generating haptic sensations, the actuator comprising:
a spherical rotor that is a permanent magnet divided into an upper polarity and a lower polarity by a virtual horizontal plane passing through the center thereof and driven by a magnetic force vector created around the same;
a stator having a space corresponding in shape to the spherical rotor defined therein to allow the spherical rotor to be positioned in the space and having a portion of an upper part of the spherical rotor exposed;
at least three rotation-driving coils formed in the stator at a given distance from each other to provide the magnetic force vector to the spherical rotor;
a central driving coil formed in a region of the stator corresponding to a lower region of the spherical rotor to provide a magnetic force vector of a linear movement to the spherical rotor, the region of the stator being perpendicular to a virtual plane in which the rotation-driving coils are arranged; and
a driving unit independently controlling electric current supplied to each of the rotation-driving coils and the central driving coil to create the magnetic force vector.
2. The actuator of claim 1 , wherein the rotation-driving coils are positioned on the virtual horizontal plane passing through a center of the spherical rotor.
3. The actuator of claim 1 , wherein the rotation-driving coils are positioned on the virtual horizontal plane passing through a region other than a center of the spherical rotor.
4. The actuator of claim 1 , wherein the driving unit controls a direction and a magnitude of the magnetic force vector of each of the rotation-driving coils to create a rotational movement, a vibration movement, and a linear movement in the spherical rotor.
5. The actuator of claim 1 , wherein the control sections are equally divided on the virtual plane in which the rotation-driving coils are positioned, and the driving unit controls a direction and a magnitude of the magnetic force vector of each of at least two rotation-driving coils and the central driving coil corresponding to a certain control section of the divided control sections to create a rotational movement, a vibration movement, or a linear movement in the spherical rotor.
6. The actuator of claim 1 , wherein the driving unit controls a direction and a magnitude of the magnetic force vector of the central driving coil to create a rotational movement, a vibration movement, or a linear movement in the spherical rotor.
7. The actuator of claim 1 , further comprising:
a sensing unit detecting a posture of the spherical rotor, in which the driving unit controls electric current applied to each of the rotation-driving coils or the central driving coil in a feedback manner using a measurement value on the posture of the spherical rotor detected by the sensing unit.
8. The actuator of claim 1 , further comprising a coupling unit for holding the stator to a human body, wherein a portion of the spherical rotor exposed from the stator is in contact with the human body.
9. The actuator of claim 1 , further comprising:
a sensing unit detecting a posture of the spherical rotor, in which the driving unit controls electric current applied to each of the rotation-driving coils or the central driving coil in a feedback manner using a measurement value on the posture of the spherical rotor detected by the sensing unit.
10. The actuator of claim 1 , further comprising a coupling unit for holding the stator to a human body, wherein a portion of the spherical rotor exposed from the stator is in contact with the human body.