Sign In
Upload
Download
Table of Contents
Contents
Add to my manuals
Delete from my manuals
Share
URL of this page:
HTML Link:
Bookmark this page
Add
Manual will be automatically added to "My Manuals"
Print this page
×
Bookmark added
×
Added to my manuals
Manuals
Brands
Sharp Manuals
Floppy Disk Drive
FDD-412A
Service manual
Sharp FDD-412A Service Manual page 34
Hide thumbs
1
2
3
4
Table Of Contents
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
page
of
119
Go
/
119
Contents
Table of Contents
Bookmarks
Table of Contents
Advertisement
FDD412A/B
2.5.6
Operations
Related
to
Spindle
Motor
Drive
Mechanism
(1)
Interface
signal
None
(automatic
control
initiated
upon
power
application)
(2)
Outline
of operation
Applying
power
immediately
rotates
the
spindle
motor.
The
mechanism
automatically
keeps
the
rotational
speed
constant
(360
rpm)
through
a feedback
loop.
(3)
Block
diagram
of spindle
motor
drive
mechanism
MTR
SPD
OK
Phase
com-
Power
pensator
amplifier
t
t
'
!
Position
detection
(HALL
IC)
|
1
'
amplifier
Frequency
oe
S
generator
'
(FG)
:
CP
ri
Ro
aes
prec
|
a
oe
es
Motor
coil |
Fig.
2.28
Block
Diagram of Spindle
Motor
Drive Mechanism
(4)
Operating
principles of spindle
motor
drive
mechanism
(a)
Drive
section
The
S pole
of the
rotary
magnet
is detected
by a position
detecting
element
(HALL
IC).
In the
setup
of Fig.
2.29,
Hy
detects
the
S pole.
This
'drives
amplifier
Vw,
allows
current
Ip to
flow,
and
rotates
the
rotor.
With
the
rotor
rotating
H,,
Hy and
Hy detects
the
S pole
in
turn
to generate
drive
voltages
(Fig.
2.30)
for motor
drive.
(b)
Feedback
section
The
frequency
generator
generates
frequencies
proportionate
to
the
rotor
revolutions.
The
generator
output
and
crystal
oscillator
output
are
compared
in phase
shift
and
frequency
to
calculate
rotation
correction
values.
— 28—
Previous
Page
Next
Page
1
...
31
32
33
34
35
36
37
38
Advertisement
Table of Contents
Related Manuals for Sharp FDD-412A
Floppy Disk Drive Sharp MZ-80FB/FBK Instruction Manual
Floppy disk (12 pages)
Floppy Disk Drive Sharp MZ-1F16 Service Manual
Mini floppy disk drive unit (16 pages)
Floppy Disk Drive Sharp MZ-80FB Instruction Manual
(12 pages)
Floppy Disk Drive Sharp MZ-80SFD Instruction Manual
Floppy disk drive (14 pages)
Floppy Disk Drive Sharp MZ-80SFD Service Manual
Single floppy disk (24 pages)
Related Products for Sharp FDD-412A
Sharp FD-500NF
Sharp FD-450NF
Sharp FO-DC525
Sharp FP-R65CX
Sharp FO-475TH
Sharp FO-135
Sharp FO-1460
Sharp FO-50
Sharp FO-781
Sharp FO-A650
Sharp FO-CC500
Sharp FU-A80A
Sharp FU-A80J
Sharp FU-P40S
Sharp FU-A28Y
Sharp FO-1470TH
This manual is also suitable for:
Fdd-412
Table of Contents
Print
Rename the bookmark
Delete bookmark?
Delete from my manuals?
Login
Sign In
OR
Sign in with Facebook
Sign in with Google
Upload manual
Upload from disk
Upload from URL