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參數(shù)資料
| 型號(hào)： | ML4411A |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Sensorless Spindle Motor Controller(無(wú)傳感器主軸電機(jī)控制器) |
| 中文描述： | 傳感器主軸電機(jī)控制器（無(wú)傳感器主軸電機(jī)控制器） |
| 文件頁(yè)數(shù)： | 6/14頁(yè) |
| 文件大小： | 241K |
| 代理商： | ML4411A |
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ML4411/ML4411A
6
REV. 1.0 10/10/2000
Minute.
The minimum VCO gain derived from the specification
table (using the minimum Fvco at V
VCO
= 6V) is:
K
C
VCOMIN
(
VCO
)
.
=
2 42 10
6
Assuming that the V
VCO(MAX)
= 9.5V, then
C
F
VCO
MAX
=
9 5 2 42 10
6
.
.
or
C
POLES RPM
F
VCO
=
460
μ
0
2
4
6
8
10
12
3000
2500
2000
1500
1000
500
0
0.01
μ
F
0.02
μ
F
F
V
VCO
(VOLTS)
Figure 3. VCO Output Frequency vs. V
VCO
(Pin 20)
Figure 4 shows the transfer function of the Phase Lock
Loop with the phase detector formed from the sampled
phase through the Gm amplifier with the loop filtered
formed by R, C1, and C2.
The impedance of the loop filter is
Z
s
C s
1
s
(
s
RC
LEAD
LAG
ω
( )
(
)
)
=
+
+
1
ω
Figure 4. Back EMF Phase Lock Loop Components
Where the lead and lag frequencies are set by:
1
ω
LEAD
RC
=
2
ω
LAG
C
RC C
C
=
+
1
2
2
START-UP SEQUENCING
When the motor is initially at rest, it is generating no
back-EMF. Because a back-EMF signal is required for
closed loop commutation, the motor must be started
“open-loop” until a velocity sufficient to generate some
back-EMF is attained (around 100 RPM). The following
steps are a typical procedure for starting a motor which is
at rest.
Step 1:
The IC is held in reset (state R) with full power
applied to the windings (see figure 6). This aligns the rotor
to a position which is 30
°
(electrical) before the center of
the first commutation state.
Step 2:
Reset is released, and a fixed current is input to
pin 21 and appears as a current on pin 20, and will ramp
the VCO input voltage, accelerating the motor at a fixed
rate.
Step 3:
When the motor speed reaches about 100 RPM,
the back EMF loop can be closed by pulling pin 18 high.
RESET/
ALIGN
P1, P3, N2 ON
OPEN-LOOP
(STEPPING)
CLOSED LOOP
V
0
RESET
ENABLE E/A
Figure 6. Typical Start-up Sequence.
Using this technique, some reverse rotation is possible.
The maximum amount of reverse rotation is 360/N, where
N is the number of poles. For an 8 pole motor, 45
°
reverse
rotation is possible.
For quick recovery following a momentary power failure,
the following steps can be taken:
PIN
16
PIN
18
PIN
21
I
LIMIT
I
CMD
I
MAX
I
MAX
I
MAX
STEP
1
0
0
FIXED
2
1
0
FIXED
3
1
1
0
Table 2. Start-up Sequence.
R
C1
C2
VCO
–
+
Z
RC
RC
F
OUT
K
VCO
(HZ/V)
Gm = 1.25 x 10
–
4
SAMPLED
PHASE
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|---|---|
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| ML4411ACS | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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| ML44126N | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:FOR OPTICAL INFORMATION SYSTEMS |
| ML44126R | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:FOR OPTICAL INFORMATION SYSTEMS |
| ML4420 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:ENHANCED SENSORLESS BLDC MOTOR CONTROLLER |
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