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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MCT8317A датащи(PDF) 48 Page - Texas Instruments |
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MCT8317A датащи(HTML) 48 Page - Texas Instruments |
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48 / 161 page  0 o 60 o 120 o 180 o 300 o 360 o Vpeak 2 Vpeak 240 o Electrical Angle, θ (degree) Vpeak Vpeak 2 Vpeak 2 Vpeak Tc Figure 8-35. Back-EMF integration using floating phase voltage In Figure 8-35 , Vpeak is the peak-peak value of the back-EMF , Vpeak/2 denotes the zero cross of the back-EMF and Tc is the commutation interval or time period of the 60o window. The highlighted triangle in each 60o window is the integral value of back-EMF used by the algorithm to determine the commutation instant. This integral value, which can be approximated as the area of the highlighted triangle, is given by Equation 5. (½)* (Vpeak/2) * Tc/2 (5) See for an example application on setting the BEMF threshold. 8.3.15.2 Dynamic Degauss In MCT8317A, the degauss time can be dynamically computed after the commutation for a precise detection of the zero crossing instant. This is done by enabling the dynamic degauss feature (DYN_DEGAUSS_EN is set to 1b). This feature allows the motor control algorithm to capture the zero crossing instant after the outgoing (floating) phase voltage is completely settled; that is, when the outgoing phase current has decayed to zero and the outgoing (floating) phase voltage is not clamped (to either VM or PGND) and represents the true back-EMF. This accurate measurement of zero cross instant allows fast acceleration of the motors (< 50ms) using MCT8317A. MCT8317A SLLSFQ2 – JANUARY 2023 www.ti.com 48 Submit Document Feedback Copyright © 2023 Texas Instruments Incorporated Product Folder Links: MCT8317A |
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