MATLAB CONTROL SYSTEM TOOLBOX 9 Specifikace stáhnout pdf (Strana 204)

100

101

10 Design Case Studies

10-20

Hard-Disk Read/Write Head Controller

This case study demonstrates the ability to perform classical digital control

design by going through the design of a computer hard-disk read/write head

position controller.

Using Newton’s law, a simple model for the read/write head is the differential

equation

where is the inertia of the head assembly, is the viscous damping

coefficient of the bearings, is the return spring constant, is the motor

torque constant, is the angular position of the head, and is the input

current.

Taking the Laplace transform, the transfer function from to is

Using the values kg , Nm/(rad/sec), Nm/rad,

and Nm/rad, form the transfer function description of this system.

At the MATLAB prompt, type

J = .01; C = 0.004; K = 10; Ki = .05;

Hard Disk Drive

Disk Platen

Disk Drive Motor

Read/Write

Head

Solenoid

Ω

----------

-------

++ K

()

Cs K++

----------------------------------

J 0.01= m

C 0.004= K 10=

0.05=

1 2 ... 199 200 201 202 203 204 205 206 207 208 209 ... 590 591

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