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MCT8317A bảng dữ liệu(PDF) 42 Page - Texas Instruments

tên linh kiện MCT8317A
Giải thích chi tiết về linh kiện  MCT8317A High Speed Sensorless Trapezoidal Control Integrated FET BLDC Driver
PDF  161 Pages
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nhà sản xuất  TI1 [Texas Instruments]
Trang chủ  http://www.ti.com
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MCT8317A bảng dữ liệu(HTML) 42 Page - Texas Instruments

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ZC
ZC
ZC
ZC
ZC
ZC
ZC
ZC
ZC
ZC
Phase
Voltage A
Phase
Voltage B
Phase
Voltage C
Figure 8-28. 120o commutation in Mixed Modulation Mode
8.3.10.2 Variable Commutation
Variable commutation can be configured by setting COMM_CONTROL to 01b. 120o commutation may result in
acoustic noise due to the long Hi-Z period causing some torque ripple in the motor. In order to reduce this torque
ripple and acoustic noise, the MCT8317A uses variable commutation to reduce the phase current ripple at
commutation by extending 120o driving time and gradually decreasing duty cycle prior to entering Hi-Z state. In
this mode, the phase is Hi-Z between 30o and 60o and this window size is dynamically adjusted based on speed.
A smaller window size will typically give better acoustic performance. Figure 8-29 shows 150o commutation with
30o window size.
MCT8317A
SLLSFQ2 – JANUARY 2023
www.ti.com
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Product Folder Links: MCT8317A



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