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| 型號(hào)： | 55VDMOSFULL-BRIDGEMOTORDRIVER |
| 英文描述： | (647.67 k) |
| 中文描述： | （647.67十一） |
| 文件頁數(shù)： | 12/18頁 |
| 文件大?。?/td> | 647K |
| 代理商： | 55VDMOSFULL-BRIDGEMOTORDRIVER |
The Typical Application
(Continued)
HALF STEP DRIVE WITHOUT TORQUE
COMPENSATION
To make the motor take half steps, windings A and B can be
energized in the sequence
A
→
AB
→
B
→
A
*
B
→
A
*
→
A
*
B
*
→
B
*
→
AB
*
→
A
→
…
The motor takes one half step each time the number of en-
ergized windings changes. It is important to note that al-
though half stepping doubles the step resolution, changing
the number of energized windings from two to one de-
creases (one to two increases) torque by about 40%, result-
ing in significant torque ripple and possibly noisy operation.
Figure 10 shows the winding currents and digital control sig-
nals for this half step application of the typical application
circuit.
DS011878-19
Top Trace: Phase A Winding Current at 1A/div
Bottom Trace: Phase B Winding Current at 1A/div
Horizontal: 1 ms/div
*500 steps/second
DS011878-20
M4 A through M1 A = M4 B through M1 B = 1
BRAKE A = BRAKE B = 0
FIGURE 8. Winding Currents and Digital Control Signals for Two-Phase-On Drive
DS011878-21
Top Trace: Phase A Winding Current at 1A/div
Bottom Trace: Phase A Sense Voltage at 5V/div
Horizontal: 1 ms/div
*500 steps/second
FIGURE 9. Winding Current and Voltage at the Output of the Associated Current Sense Amplifier
www.national.com
12
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