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參數(shù)資料
| 型號： | ML4426 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Bi-directional Sensorless BLDC Motor Controller(雙向無傳感無刷直流電機(jī)控制器) |
| 中文描述： | 雙向傳感器無刷直流電機(jī)控制器（雙向無傳感無刷直流電機(jī)控制器） |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 1089K |
| 代理商： | ML4426 |
ML4426
The maximum frequency on the VCO pin is found by:
f
N RPM
MAX
MAX
=
005
.
(3)
The voltage at the VCO/TACH pin is equal to the rotor
speed. The voltage at SPEED FB is controlled by the back
EMF sampler.
BACK EMF SAMPLER
The input to the voltage controlled oscillator is the back
EMF sampler. The back EMF sense pins FB A, FB B, and
FB C inputs to the back EMF sampler require a signal
from the motor phase leads that is below the V
DD
of the
ML4426. The phase sense input impedance is 8k
W
. This
requires a series resistor RES1 from the motor phase lead
as shown in Figure 6 based on the following equation:
1
RES
V
V
V
MOTOR
1 670
10
-
W
/
6
(4)
The back EMF sampler takes the motor phase voltages
divided down to signals that are less than V
DD
(12V
nominal) and calculates the neutral point of the motor by
the following equation:
Neutral
PH
PH
PH
=
+
+
1
2
3
3
(5)
This allows the ML4426 to compare the back EMF signal
to the motor's neutral point without the need for bringing
out an extra wire on a WYE wound motor. For DELTA
wound motors there is no physical neutral to bring out, so
this reference point must be calculated in any case.
The back EMF sampler measures the motor phase that is
not driven (i.e. if LA and HB are on, then phase A is
driven low, phase B is driven high, and phase C is
FUNCTIONAL DESCRIPTION
(Continued)
Figure 5. External VCO Component Connections
CVCO
CVCO
4.3V
0V
5V
2.3V
RVCO
SPEED
FB
CVCO
RVCO
VOLTAGE
CONTROLLED
OSCILLATOR
VCO/TACH
VCO/TACH
RESET
(FROM CAT)
FROM
BACK EMF
SAMPLER
& RAMP
GENERATOR
NEUTRAL
SIMULATOR
Φ
A +
Φ
B +
Φ
C
6
MULTIPLEXER
COMMUTATION
STATE MACHINE
gm =
1
8k
4k
4k
4k
4k
4k
4k
+
–
SIGN
CHANGER
TO
SPEED FB
FB A
RES1
RES2
RES3
FB B
FB C
MOTOR
Φ
C
MOTOR
Φ
B
MOTOR
Φ
A
Figure 6. Back EMF Sampler Detailed Block Diagram
sampled). The sampled phase provides a back EMF signal
that is compared against the neutral of the motor. The
sampler is controlled by the commutation state machine.
The sampled back EMF is compared to the neutral through
an error amplifier. The output of the error amplifier outputs
a charging or discharging current to SPEED FB, which
provides the control voltage to the VCO.
REV. 1.0 10/10/2000
9
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4426 WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4426CH | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Bi-directional Sensorless BLDC Motor Controller |
| ML4426CP | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Bi-directional Sensorless BLDC Motor Controller |
| ML4426CS | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ML4426IH | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Bi-directional Sensorless BLDC Motor Controller |
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