參數(shù)資料
型號: L6238
廠商: 意法半導體
英文描述: Sensorless Spindle Motor Driver(無傳感器主軸電機驅(qū)動器)
中文描述: 傳感器主軸電機驅(qū)動器(無傳感器主軸電機驅(qū)動器)
文件頁數(shù): 26/35頁
文件大?。?/td> 383K
代理商: L6238
For laboratory evaluation purposes, a simple re-
sistive network as shown in figure 28 can be used
to emulate the Bemf of the motor.
The actual Bemf zero-crossing is 30 electricalde-
grees (50% of a commutationinterval) 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.
6.0 SERIAL PORT
Figure27:
Bemf Amplifier.
Figure28:
Bemf Emulator.
L6238
26/35
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