參數(shù)資料
型號: GFU
廠商: 意法半導體
英文描述: Switch-Mode Driver for DC Motors(用于直流電機的開關(guān)模式驅(qū)動器)
中文描述: 開關(guān)模式直流電動機的驅(qū)動程序(用于直流電機的開關(guān)模式驅(qū)動器)
文件頁數(shù): 8/12頁
文件大?。?/td> 161K
代理商: GFU
CLOSED-LOOP SYSTEM STEP RESPONSE
a) Small - signals analysis.
The transfer function (3) can be written as follows:
I
M
V
I
(
s
)
=
0.044
R
s
1
+
s
2
ξ
ω
o
1
+
2
ξ
s
+
s
2
ω
o
ω
o
2
(7)
where wo =
G
mo
R
s
R
4
C R
F
C
F
is the cutoff frequency
ξ
=
4 R
F
C
F
G
mo
R
s
is the dumping factor
R
4
By choosing the
ξ
value, it is possible to determine
the system response to an input step signal.
Examples :
1)
ξ
= 1 from which
I
M
(
t
)
=
0.044
R
s
[ 1
e
t
2R
F
C
F
(
1
+
t
4 R
F
C
F
)
]
V
i
(where Vi is the amplitude of the input step).
2)
ξ
=
1
2 from which
I
M
(
t
)
=
0.044
R
s
(
1
cos
t
2 R
F
C
F
e
t
2 R
F
C
F
)
V
i
Figure 8. Small Signal Step Response
(normalized amplitude vs.
t / R
F
C
F
).
V
7
= 200 mV/div.
I
M
= 100 mA/div.
t = 100
μ
s/div.
with V
I
= 1.5 Vp.
8/12
L292
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