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参数资料
| 型号： | L6238S013TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 5 A, PQCC44 |
| 封装： | PLASTIC, LCC-44 |
| 文件页数： | 6/31页 |
| 文件大小： | 3465K |
| 代理商： | L6238S013TR |
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192/Falign seconds.
- During the alignment phase, the SEQ INCRE-
MENT signal is ignored.
Go Phase
- The internal sequencer double increments the
output stage to State 6, which should produce
torque in the desired direction.
- with SEQ INCREMENT held low, the se-
quencer is now controlled by the Bemf zero
crossings, and the motor should ramp up to
speed.
3.3 Externally Controlled Start-Up Algorithms
Enhanced Start-Up Algorithms can be achieved
by using a
Processor to interact with the
L6238S.’ The L6238S has the ability to transition
to Closed Loop Start-Up at very low speeds, re-
ducing the uProcessor task to monitoring status
rather than real time interaction. Thus, it is a per-
fect application for an existing
Processor.
The following control and status signals allow for
very flexible algorithm development:
SEQ_INCR A low to high transition at this input
is used to increment the state of the power out-
put stage. It is useful during start-up, because
the
Processor can cycle to any desired state,
or cycle through the states at any desired rate.
When held high, it inhibits the BEMF zero
crossings from incrementing the internal se-
quencer.
SPIN SENSE This output is low until the first
detected Bemf zero crossing occurs. It then
toggles at each successive zero crossing. This
signal serves as a motion detector and gives
useful timing information as well as the slope
of the Bemf.
3.4 Start Up Approaches
Align & Go Approach The Align & Go approach
provides a very time efficient algorithm by ener-
gizing the coils to align the rotor and stator to a
known phase. This approach can be achieved via
the sequencing SEQ INCR. SPIN SENSE can be
monitored to assure that motion occurred. Once
ample time is given for alignment to occur, SEQ
INCR can be double incremented, and the SPIN
SENSE pin can be monitored to detect motion.
When SEQ INCR is pulled low, control is trans-
ferred to the internal sequencer, and the L6238S
finishes the spinup operation. If no motion is de-
tected, SEQ INCR can be incremented to a differ-
ent phase and the process can be repeated. The
alignment phase may cause backward rotation,
which on the average will be greater than the
Stepper Motor approach.
The Auto-Start algorithm described earlier is an
Align & Go approach. The main advantages of
the integrated Auto-Start are that the
P is not in-
volved real-time, and there are a minimum of in-
terface pins required to the spindle control sys-
tem.
Stepper Motor Approach This approach mini-
mizes backward rotation by sequencing SEQ
INCR at an initial rate that the rotor can follow.
Thus, it is driven in a similar fashion to a stepper
motor. The rate is continually increased until the
Bemf voltage is large enough to reliably use the
zero-crossings for commutation timing. SEQ
INCR is held low, causing control to be passed to
the L6238S’s internal sequencer as in the Align &
Go approach.
The Stepper Motor approach takes longer than
the Align & Go approach because the initial com-
mutation frequency and subsequent ramp rate
must be low enough so that the motor can follow
without slipping. This implies that to have a reli-
able algorithm, the initial frequency and ramp rate
must be chosen for the worst case motor under
worst case conditions.
4.0 MOTOR DRIVER
4.1 Output Stage
The output stage forms a 3-Phasefull wave bridge
consisting of six Power DMOS FET High output
currents are allowed for bbrief periods. High out-
put currents are allowed for brief periods. Output
Power exceeding the stand-alone power dissipa-
tion capabilities of the L6238S can be increased
with the addition of an external P-FET or by the
use of Pulse-Width-Modulation.
Table 4-1 is a reference diagram that lists the pa-
rameters associated with 8-pole motors operating
at 3600 and 5400 RPM.
Figure 4-1 represents the waveforms associated
with the output stage. The upper portion of figure
4-1 shows the flow of current in the motor wind-
ings for each of the 24 phase increments. A rota-
tional degree index is shown as a reference along
with a base line to indicate the occurrence of a
zero crosing. The output waveforms are a digitally
reproduced voltage signals as measured on sam-
ples.The feedback Input is multiplexed between
the internal Bemf Zero Crossing Detector and an
externally provided sync pulse (EXT INDEX)
Shown in figure 10 is the classical state diagram
for a phase detector along with waveform exam-
ples.
A typical
sequence starts when the outputs
switch states. Referring to figure 4-1, during
phase 1, output A goes high, while outputB is low.
During this phase, output C is floating, and the
Bemf is monitored. The outputs remain in this
state for 60 electrical degrees as indicated by the
first set of dashed lines. After this period the out-
L6238S
14/31
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| L6239 | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
| L623C | 制造商:未知厂家 制造商全称:未知厂家 功能描述:THYRISTOR MODULE|BRIDGE|HALF-CNTLD|CA|280V V(RRM)|46A I(T) |
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