參數(shù)資料
型號(hào)： L6238SQA
廠商： 意法半導(dǎo)體
英文描述： 12V SENSORLESS SPINDLE MOTOR CONTROLLER
中文描述： 12V的無(wú)傳感器主軸電機(jī)控制器
文件頁(yè)數(shù)： 21/31頁(yè)
文件大小： 324K
代理商： L6238SQA
sistive network as shown in figure 4.12 can be
usedto emulatethe Bemf of the motor.
The actual Bemf zero-crossing is 30 electrical de-
grees (50% of a commutation interval) away from
the optimal switch point. A digital counter circuit
measures 50% of the previous interval to deter-
mine the next interval’s commutation delay from
the zero crossing. During the low RPM stages of
start up the long commutation intervals may
cause the counter to overflow, in which case 50%
of the max count will be less than 50% of the
ideal commutation interval. Therefore, the torque
will not be optimal until the desired commutation
interval is less than the dynamic range of the
counter.
4.9 CenterTap Protection
Spindle Motors with a high number of windings
exhibit a transformer coupling effect that in some
cases can cause relatively high currents to flow
through the center tap input.
Current flowing out of the center tap pin as high
as 25mA has been observed with certain motors.
Figure 4-12:
BemfEmulator
R1 1K
DS1
TO CENTER
TAP INPUT
D95IN317
Figure4-13
Figure 4-11:
BemfAmplifier.
Vo
BEMF
-35
-25
0
25
35
Vi
BEMF(mV)
SLOPE=0
SLOPE=1
D95IN316
L6238S
21/31
相關(guān)PDF資料
PDF描述
L6238SQT 12V SENSORLESS SPINDLE MOTOR CONTROLLER
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參數(shù)描述
L6238SQT 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:12V SENSORLESS SPINDLE MOTOR CONTROLLER
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L623F 制造商:未知廠家 制造商全稱:未知廠家 功能描述:THYRISTOR MODULE|BRIDGE|HALF-CNTLD|CA|280V V(RRM)|46A I(T)
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