Velocity sensing using actuator coil back-emf voltage

Details Velocity sensing using actuator coil back-emf voltage Velocity sensing using actuator coil back-emf voltage

1996-12-20

1998-12-01

Edun, Muhammad N.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7801, G11B 5596

Patent

active

058447431

ABSTRACT:
Apparatus and method for improved positional control in a disc drive servo loop, wherein the actual velocity of rotary actuator is sensed from the motion-induced back-emf generated by movement of a coil of the actuator through the magnetic field of a voice coil motor. A current sense resistor is used in conjunction with the coil to provide closed loop control of the current applied to the coil. Signals indicative of the voltages across the serial combination of the coil and current sense resistor are provided to a velocity sense circuit, which determines the velocity of the coil by generating and subtracting out values for the dc voltage drops across the coil and the current sense resistor and the ac voltage drop across the coil. A compensation routine is provided to compensate for variations in temperature of the coil during operation. The sensed velocity of the coil is thereafter used in conjunction with other conventionally obtained measurements of estimates of head velocity to improve the accuracy and the reliability of the servo loop.

REFERENCES:
patent: 4967291 (1990-10-01), Touchton et al.
patent: 5136439 (1992-08-01), Weispfenning et al.
patent: 5262907 (1993-11-01), Duffy et al.

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