By Abdullah Al Mamun
The hard drive 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 pace. expanding call for for better facts density in addition to disturbance-prone working environments proceed to check designers mettle.
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Additional resources for Hard Disk Drive: Mechatronics and Control
49 Spindle motor with in-hub structure. . . . . . . . 50 Spindle motor with inner rotor in a hard disk drive. . . . 51 Laminated stator core of spindle motor: (a) stator core for outer rotor spindle motor and (b) stator core for inner rotor spindle motor. . . . . . . . . . . . . . . . . 52 Structure of the ball bearing used in spindle motor . . . . 53 Movements of balls in the ball bearing. . . . . . . . 54 Acoustic noise spectrum of a spindle motor with ball bearing (5,400 rpm, PWM drive).
260 Spindle motor with moving shaft FDB. . . . . . . . 260 Spindle motor with fixed shaft FDB. . . . . . . . 260 Spectrum of acoustic noise for spindle motor with fixed shaft FDB. . . . . . . . . . . . . . . . . 261 Winding ending of a 3-phase AC motor. . . . . . . 263 Concentrated winding used in spindle motor (9 slots). . . 263 The concentrated winding of a spindle motor. . . . . . 60. . 264 MMF expressed in electric degree . . .
Current in a single coil when commutation is used. . . . The torque waveform of a single coil with mechanical commutation in use. . . . . . . . . . . . . . . Torque produced by the DC EM system with 3 phase coils Ta : torque produced by coil-AX, Tb : torque produced by coil-BY, Tc : torque produced by coil-CZ . . . . . . . . . 25 Connection of three symmetric coils . . . . . . . . 26 The structure of PM BLDC motor . . . . . . . . 27 The 3 phase coils of PM BLDC motor driven by 3-phase full bridge (with sensor) .
Hard Disk Drive: Mechatronics and Control by Abdullah Al Mamun