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參數(shù)資料
| 型號(hào)： | ML4411 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Sensorless Spindle Motor Controller(無傳感器主軸電機(jī)控制器) |
| 中文描述： | 傳感器主軸電機(jī)控制器（無傳感器主軸電機(jī)控制器） |
| 文件頁數(shù)： | 7/14頁 |
| 文件大?。?/td> | 241K |
| 代理商： | ML4411 |
ML4411/ML4411A
REV. 1.0 10/10/2000
7
OUTPUTS
INPUT
SAMPLING
N/A
PH2
PH1
STATE
R OR 0
A
B
N1
OFF
OFF
OFF
N2
ON
OFF
OFF
N3
OFF
ON
ON
P1
ON
ON
OFF
P2
OFF
OFF
ON
P3
ON
OFF
OFF
C
D
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF
OFF
ON
PH3
PH2
E
F
OFF
OFF
ON
ON
OFF
OFF
OFF
ON
OFF
OFF
ON
OFF
PH1
PH3
Table 1. Commutation States.
R
RESET
0
A
B
C
D
E
F
A
4.3 V
C
VCO
2.3 V
VCO OUT
STATE
Figure 5. Commutation Timing and Sequencing.
ADJUSTING OPEN LOOP STEP RATE
I
RAMP
should be set so that the VCO’s frequency ramp
during “open loop stepping” phase of motor starting is less
than the motor’s acceleration rate. In other words, the
motor must be able to keep up with the VCO’s ramp rate
in open loop stepping mode. The VCO’s input voltage
(V
PIN 20
) ramp rate is given by:
dV
dt
I
C
C
VCO
RAMP
+
1
≈
2
since
F
K
V
VCO
VCO
VCO
=
×
K
C
VCO MAX
(
VCO
)
=
4 10
6
then combining the 3 equations I
RAMP
can be calculated
from the desired maximum open loop stepping rate the
motor can follow.
I
dF
dt
C
C
(
C
RAMP
VCO
VCO
<
×
+
6
)
1
2
4 10
Step 1a:
The IC is held in reset (state R) with I
CMD
low
and DIS PWR low. The Micro Processor monitors the
VCO/TACH OUT pin to determine if a signal is present. If
a signal is present, the frequency is determined (by
measuring the period). If a signal is not present, proceed
to the routine described above for starting a motor which
is a rest.
Step 2a:
Release RESET and DIS PWR. Apply a current to
pin 21 and monitor the VCO/TACH OUT pin for VCO
frequency.
Step 3a:
When the VCO frequency approaches 6 X the
motor frequency (or where the motor frequency has
decelerated to by coasting during the time the VCO
frequency was ramping up) the back EMF loop can be
closed by pulling pin 18 high and motor current brought
up with I
CMD
or I
LIMIT
.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ML4423 | 1, 2, or 3-Phase Variable Speed AC Motor Controller(一、二或三相可變速交流電機(jī)控制器) |
| ML4425 | Sensorless BLDC Motor Controller |
| ML4425CP | Sensorless BLDC Motor Controller |
| ML4425CS | Sensorless BLDC Motor Controller |
| ML4425IP | Sensorless BLDC Motor Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4411ACS | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ML4411CS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Sensorless Spindle Motor Controller |
| 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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