Spindle force actuator
View Patent ↗An apparatus includes a circuit, a code modulator, and an actuator. The circuit is operable to detect displacements of a rotating object while in motion. The circuit is operable to detect a position of the displacements and to generate a signal associated therewith. The code modulator is operable to generate a modulated signal based on the position and the displacements. The actuator is operable to apply a force to the rotating object, wherein the force is based on the modulated signal.
1. An apparatus comprising:
a sensor board comprising a plurality of sensors configured to detect displacements of a spindle motor in motion and a rotational position of an electrical field, and wherein the sensor board is configured to filter out stationary information associated with the spindle motor comprising a shape of the electrical field and a shape of the spindle motor;
a filter configured to receive the detected displacements and the rotational position of the electrical field, wherein the filter is further configured to determine and output an instantaneous velocity and a force based on the detected displacements and the rotational position of the electrical field; and
an actuator configured to receive the output from the filter and further configured to apply a force substantially opposite and equal in value to the determined force to the spindle motor.
2. The apparatus of claim 1 further comprising:
a converter coupled to the plurality of sensors, wherein the converter is configured to determine respective positions of the detected displacements.
3. The apparatus of claim 1 , wherein the plurality of sensors is selected from the group consisting of a hall sensor, a charge coupling sensor, and a microphone.
4. The apparatus of claim 1 , wherein the actuator is selected from the group consisting of an air jet, a piezo element, and an electromagnet.
5. The apparatus of claim 1 , wherein the actuator is an electromagnet actuator and comprises odd and even coils wound clockwise and counterclockwise.
6. The apparatus of claim 1 , wherein a gap between the actuator and the plurality of sensors ranges between 0.1 mm to 1.0 mm.
7. The apparatus of claim 1 , wherein the filter comprises a decimation filter.
8. The apparatus of claim 1 further comprising:
a plurality of switches, wherein each switch of the plurality of switches is associated with a coil winding associated with a tooth of the actuator, and wherein switches of the plurality of switches turn on and off responsive the output from the filter to apply a force substantially opposite and equal in value to the determined force to the motor.
9. The apparatus of claim 1 further comprising a sigma delta component coupled to the plurality of sensors, wherein the sigma delta component is configured to determine respective positions of the detected displacements.
10. A method comprising:
detecting displacements of a motor in motion;
filtering out stationary information associated with the motor comprising a shape of an electrical field and a shape of the motor;
determining an instantaneous velocity and a force associated with the detected displacements from positions of the detected displacements and further from a position of a rotating electrical field; and
applying a force substantially opposite and equal in value to the determined force to the motor at the positions of the detected displacements.
11. The method of claim 10 further comprising:
determining positions of the detected displacements.
12. The method of claim 10 further comprising:
determining the position of the rotating electrical field.
13. The method of claim 10 , wherein the applied force is an electromagnetic force.