Brushless spindle DC motor as an actuator to create radial force
AssigneeSeagate Technology LLC
InventorsGunter K. Heine, Hans Leuthold, Christian Fleury
Life of this patent
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Abstract
An apparatus for stabilizing the spin axis of a rotating system, the rotating system having a rotor and motor means to cause rotation of the rotor about the spin axis and a magnet, windings, a source of drive current and an actuator combined with the motor means and forming a source of actuator current energizing the windings to generate a radial force which stabilizes the position of the spin axis and dampens other than rotational movements of the rotor.
Claims16
An apparatus for stabilizing the spin axis of a rotating system comprising a disc drive, said rotating system comprising:
- a rotor carrying an inertial load comprising at least one disc and bearing means to support said rotor and said disc about said spin axis, and
- a motor to cause rotation of said rotor about said spin axis comprising:
- a first set of windings;
- a magnet supported radially adjacent the windings;
- a source of drive current for causing relative rotation between said windings and said magnet;
- and
- an actuator combined with the motor and comprising a source of actuator current energizing said windings to generate a radial correction force which stabilizes the position of said spin axis and dampens movements of said rotor and disc, including probes associated with said rotor to measure a gyroscopic motion of said rotor of said shaft, at least one output of said probes being processed to establish a signal applied to energize said windings and stabilize said system and a comb filter responsive to the output of said probe to separate components that are synchronous with the speed of said motor of said rotating system from components that are not synchronous with said motor speed and represent oscillatory movements of said rotor to be dampened.
An apparatus for stabilizing the spin axis of a rotating system comprising a disc drive, said rotating system comprising:
- a rotor carrying an inertial load comprising at least one disc and bearing means to support said rotor and said disc about said spin axis, and
- a motor to cause rotation of said rotor about said spin axis comprising:
- a first set of windings;
- a magnet supported radially adjacent the windings;
- a source of drive current for causing relative rotation between said windings and said magnet;
- and
- an actuator combined with the motor and comprising a source of actuator current energizing said windings to generate a radial correction force which stabilizes the position of said spin axis and dampens movements of said rotor and disc, including probes associated with said rotor to measure a gyroscopic motion of said rotor of said shaft, at least one output of said probes being processed to establish a signal applied to energize said windings and stabilize said system wherein said motor has a slotless winding, and said first windings are concentric but placed in the same airgap between a core and the rotating magnets of said motor.
An apparatus for stabilizing the spin axis of a rotating system comprising a disc drive, said rotating system comprising:
- a rotor carrying an inertial load comprising at least one disc and bearing to support said rotor and said disc about paid spin axis, and
- a motor to cause rotation of said rotor about said spin axis comprising:
- a first set of windings;
- a magnet supported radially adjacent the windings;
- a source of drive current for causing relative rotation between said windings and said magnet;
- and
- an actuator combined with the motor and comprising a source of actuator current energizing said windings to generate a radial force which stabilizes the position of said spin axis and dampens movements of said rotor and disc further comprising;
- means for sensing movements of said rotor;
- comb means for separating non-repeating movements from repeating movements of said rotor;
- said actuator being responsive to said comb means to stabilize said rotor.
Dependencies are inferred from the claim text.