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參數(shù)資料
| 型號(hào)： | LS7262 |
| 廠商： | LSI Corporation |
| 英文描述： | BRUSHLESS DC MOTOR COMMUTATOR/CONTROLLER |
| 中文描述： | 無(wú)刷直流電機(jī)換向器/控制器 |
| 文件頁(yè)數(shù)： | 6/7頁(yè) |
| 文件大?。?/td> | 79K |
| 代理商： | LS7262 |
COMMON
BRAKE INPUT
LS7262
MOTOR SUPPLY
BRAKE
Vss
OVERCURRENT
SENSE
L4
L3
L2
L1
Vss
FIGURE 4A
5
9
2
4
6
8
12
O1
O3
O4
O6
BRAKE
COMMON
LS7262
OVERCURRENT
SENSE
Vss
Vss
12
5
9
2
4
6
8
L4
L3
L2
L1
BRAKE
MOTOR SUPPLY
O1
O3
O4
O6
FIGURE 4B
Vss
-
+
13
V TRIP
OSCILLATOR
R6
R2
C1
S1
R1
15
Vss
C3
Vss
R3
R4
R5
D1
C2
Vss
R8
LS7260
or
LS7262
FROM MOTOR
POSITION
SENSOR
14
C4
R7
FIGURE 5
CLOSED-LOOP SPEED CONTROLLER
A closed loop system can be configured by differentiating
one of the motor position sense inputs and integrating only
the negative pulses to form a DC voltage that is applied to
the inverting input of an op-amp. The non-inverting input
voltage is adjusted with a potentiometer until the resultant
voltage at VTRIP causes the motor to run at desired speed.
The R2-C1 differentiator, the R3-D1 negative pulse trans-
mitter and the R4-C2 integrator form a frequency to voltage
converter. An increase in motor speed above the desired
speed causes VTRIP to increase which lowers the PWM
and the resultant motor speed. A decrease in speed lowers
VTRIP and raises the PWM and the resultant motor speed.
For proper operation, both R5 and R6 should be greater
than R4, and R4 in turn should be greater than both R2 and
R3. Also, the R4-C2 time constant should be greater than
the R2-C1 time constant. C3 may be added across R6 for
additional VTRIP smoothing.
FIGURE 4. FOUR PHASE OUTPUT DRIVER CIRCUITRY
The information included herein is believed to be
accurate and reliable. However, LSI Computer Systems,
Inc. assumes no responsibilities for inaccuracies, nor for
any infringements of patent rights of others which may
result from its use.
7260-082697-6
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