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參數(shù)資料
| 型號： | L6238 |
| 廠商： | 意法半導(dǎo)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)： | 18/35頁 |
| 文件大?。?/td> | 383K |
| 代理商： | L6238 |
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5.O MOTORDRIVER
5.1 Output Stage
The output stage forms a 3-phase, full wave
bridge consisting of six Power DMOS FETs capa-
ble of 2.5 amps. Higher output currents are al-
lowed for brief periods. Output Power exceeding
the stand-alone power dissipation capabilities of
the L6238 can be increased with the addition of
an externalP-FET.
Table 3 is a reference diagram that lists the pa-
rameters associated with 8-pole motors operating
at 3600 and5400 RPM.
Figure 15 represents the waveforms associated
with the output stage. The upper portion of fig-
ure 15 shows the flow of current in the motor
windings for each of the 24 phase increments. A
rotational degree index is shown as a reference
along with a base line to indicate the occurrence
of a zero crossing. The 3 output waveforms are
actual digitally reproduced voltage signals as
measured on samples.
A typical sequence startswhen the outputsswitch
states.Referring to figure 15, during phase 1, out-
put A goes high, while output B is low. During this
phase, output C is floating, and the Bemf is moni-
tored.The outputsremain in this state for 60 elec-
trical degrees as indicated by the first set of
dashed lines. After this period the outputswitches
to phase 2 with output A high and C low with the
Bemfamplifier monitoring output B.
In order to preventcommutationcurrent noise be-
ing detected as a false zero crossing, a masking
circuit automatically blanks out all incoming sig-
nals as soon as a zero crossing is detected.
When the next commutation occurs an internal
counter starts counting down to set the time that
the masking pulse remains The counter is initially
loaded with a number that is equal to period that
is always 25% of the previousphase period or 15
electrical degrees. This time-out of the masking
pulse shown for reference at the bottom of figure
16. Thus the actual masking period is the total of
the time from the detected zero crossing to the
commutation, plus 25% of the previous period.
The mask pulse operation is further discussed in
section5.6, Slew Rate Control.
After the masking period, the Bemfvoltage at out-
put B is monitored for a zero crossing. Upon de-
tectionof the crossing the output is sequenced af-
ter 30 electrical degrees insuring maximum
Table 3.
Rotational Speed
3600 rpm
5400 rpm
Rotational Freq.
60Hz
90Hz
Rotational Period
16.667 ms
11.111 ms
Electrical Period
4.167 ms
2.778 ms
Phase Period
694.5
μ
s
463.0
μ
s
L6238
18/35
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