Hard Disk Drive: Mechatronics and Control (Google eBook)

Front Cover
CRC Press, Nov 1, 2006 - Technology & Engineering - 359 pages
2 Reviews
The hard disk drive is one of the finest examples of the precision control of mechatronics, with tolerances less than one micrometer achieved while operating at high speed. Increasing demand for higher data density as well as disturbance-prone operating environments continue to test designers' mettle. Explore the challenges presented by modern hard disk drives and learn how to overcome them with Hard Disk Drive: Mechatronics and Control.

Beginning with an overview of hard disk drive history, components, operating principles, and industry trends, the authors thoroughly examine the design and manufacturing challenges. They start with the head positioning servomechanism followed by the design of the actuator servo controller, the critical aspects of spindle motor control, and finally, the servo track writer, a critical technology in hard disk drive manufacturing. By comparing various design approaches for both single- and dual-stage servomechanisms, the book shows the relative pros and cons of each approach. Numerous examples and figures clarify and illustrate the discussion.

Exploring practical issues such as models for plants, noise reduction, disturbances, and common problems with spindle motors, Hard Disk Drive: Mechatronics and Control avoids heavy theory in favor of providing hands-on insight into real issues facing designers every day.
  

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hard disk drive

Contents

Introduction
1
11 History of HDD Technology
5
112 Emergence of Desktop Computers
6
113 Small Form Factor Drives
7
121 Head and Disk
8
122 Electromechanical Components
11
123 Mechanical and Electronic Components
16
13 Accessing Data in HDD
17
36 Emergence of DualStage Actuator
165
361 Actuated Suspension
166
362 Actuated Slider
167
363 Actuated Head
170
364 Microactuator for Controlling HeadMedia Spacing
172
37 Control of DualStage Actuator
174
371 Control Design Specifications
175
372 Parallel Structure
176

132 Locating Data
18
133 Track Seek and Track Following
20
134 Zoned Bit Recording
21
14 Trend in HDD Industry
22
142 Trend in Drive Form Factor
24
143 Trend in Data Transfer Rate
25
15 Alternative Recording Technologies
27
Head Positioning Servomechanism
31
22 The Actuator
35
221 Measurement of Frequency Response
40
222 Identification of Transfer Function Model
43
23 Feedback of Position Signal
45
231 Servo Bursts
46
232 Servo Demodulation
51
233 Recent Developments
53
24 High Frequency Dynamics
57
25 Noise and Disturbances
58
251 Repeatable and Nonrepeatable Runout
59
252 Pivot Friction
61
253 Flex Cable Bias
64
26 Track Seek Controller
65
261 Time Optimal Control
66
262 Proximate Time Optimal Servomechanism
70
263 Rejection of Input Disturbance
75
264 Mode Switching Control with Initial Value Compensation
78
265 Suppression of Residual Vibration
80
Design of Actuator Servo Controller
83
31 Review of Design Methods
84
311 Slow Dynamic Systems
85
312 Fast Dynamic Systems
86
32 PIDtype Control
88
321 Basic PIDtype Controller
89
322 Cancelling Actuator Resonances using Notch Filter
94
323 Cancelling Sensor Noise using Notch Filter
102
324 Phase Stable Design
104
325 Inserting a Peak Filter
110
Application of Different Filters
115
33 Factors Limiting Servo Performance
117
331 Limitation of S + T 1
119
332 Waterbed Effect
121
333 Bandwidth Limitations
123
34 Optimal Control
124
Continuoustime Case
125
Discretetime Case
128
343 An Application Example
129
35 Advanced Topics
131
351 Input Command Shaping
132
352 Initial Value Compensation
136
353 RRO Compensation
140
354 Multirate Control
151
355 Multisensing Servo
155
373 PQ Method
184
374 Decoupled MasterSlave Structure with Actuator Saturation
186
375 Experimental Results
195
Spindle Motor Control
205
412 Flux Density Magnetic Induction
206
414 Energy in Magnetic Field
207
415 BH Curve
208
416 Magnetic Circuit and Magnetomotive Force
211
42 Electric Motor Fundamentals
217
422 Rotating Magnetic Field Polepair Speed and Frequency
220
423 Force and Torque Generated by Magnetic Field
224
424 Cogging Torque and Unbalanced Magnetic Pull
236
425 Generation of backEMF
238
426 Electrical Degree and Mechanical Degree
242
427 Armature reaction
243
428 Conditions of Magnetic Field for Producing Amperes Torque
245
43 Spindle Motors used in HDD
247
432 BackEMF in Spindle Motor
249
433 Load of Spindle Motor
251
434 Motor Configuration
252
435 Magnetic Ring
254
436 Stator Core
256
438 Winding Structure and the Airgap Field Produced by the Winding
262
439 Cogging Torque UMP and Armature Reaction
268
4310 Electromagnetic Power Electromagnetic Torque and Motor Losses
271
44 Spindle Motor Drive System
273
441 What is the BLDC mode?
274
442 Detection of Rotor Position in Sensorless Drive
276
443 Starting of Spindle Motor
287
444 Spindle Motor Driven in Sensorless BLDC Mode
291
445 Acoustic Noise in Spindle Motor Driven in BLDC Mode
301
Servo Track Writer
307
52 HDA Servowriting
310
522 Control of Radial Position using Mechanical Pushpin
313
523 Control of Radial Position using Optical Pushpin
314
53 Media STW
315
54 Self Servowriting
317
541 Basic Concept
318
542 Track Propagation
319
543 Clock Propagation
321
544 Concluding Remarks
323
55 A Laboratoryscale Example
324
552 Measurement and Reduction of DiskSpindle Pack Imbalance
327
553 Control System
328
554 Test Results
330
56 Printing the patterns
331
562 Magnetic Printing
332
Bibliography
335
Index
355
Copyright

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