By Abdullah Al Mamun
The hard disk is among the most interesting examples of the precision keep an eye on of mechatronics, with tolerances lower than one micrometer accomplished whereas working at excessive velocity. expanding call for for larger facts density in addition to disturbance-prone working environments proceed to check designers mettle.
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Extra info for Hard Disk Drive: Mechatronics and Control
Relative velocity between head and data track (v = ωR) depends on the radius (R) at which the track is located. This velocity (v) is smaller when the head is over an inner track than that for an outer track. As a result, the amplitude of the read back signal in an inductive head becomes smaller and smaller as the head moves towards ID. Drives currently available in the market use the giant magneto-resistance (GMR) heads, dual spin valve heads, and tunnel junction heads. These advanced heads utilize new technologies to enhance the magneto-resistive eﬀect and thus the read head sensitivity.
266 Concentrated winding for 9-slots/4-pole-pair spindle motor. . 65. 65. . . . . . . . . . . 268 The gap between the stator core and rotor core . . . . . 269 The radial direction airgap field in a spindle motor, A: The state without armature current and B: The state with 5 times of rated armature current. . . . . . . . . . . . . . 269 Cogging torque produced in a spindle motor with 9-slots and 3-pole-pairs (obtained by using finite element method). . . 270 Power flow in spindle motor.
89 Gate signals for the three-phase inverter in twelve-step starting. 90 Three phase voltages in twelve-step starting. . . . . . 91 Current vector in the 6-step and 12-step. . . . . . . 92 Operation states of three-phase BLDC spindle motor. . . 93 Line voltage waveforms of CV-BLDC mode. . . . . . 94 EM torque produced by diﬀerent commutation angle in using constant current drive mode. . . . . . . . . . 95 EM torque produced by optimal commutation angle in CCBLDC drive mode.
Hard Disk Drive: Mechatronics and Control by Abdullah Al Mamun