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LB1921 Arkusz danych(PDF) 10 Page - Sanyo Semicon Device |
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LB1921 Arkusz danych(HTML) 10 Page - Sanyo Semicon Device |
10 / 10 page No. 5439-10/10 LB1921 17. Servo Constants Since the servo constant calculation depends strongly on the motor characters and requires significant expertise, we recommend that the motor manufacturer determine the constants in normal cases. Sanyo can provide the required IC characteristics data for the servo constant calculations and frequency characteristics simulation data for the filter characteristics specified by the motor manufacturer. When the resistor (R10) inserted between DOUT and INT.IN is too small, C8 and C9 will become too large and if R10 is too large speed errors become more likely to occur due to the speed discriminator cutoff and the integrator input current. Therefore, a value of between 10 and 100 k Ω is advisable. If the resistor (R8) inserted between POUT and INT.IN is too small, the influence of the PLL system will be too large and pull-in to synchronization with the lock state will degrade. Therefore, this resistor must not be too small. We recommend a value of around 1 M Ω when R10 is 75 k Ω. First determine the constants for the speed discriminator (R9, R10, C8 and C9) and then determine the value of R8 in the PLL system. This catalog provides information as of December, 1997. Specifications and information herein are subject to change without notice. s No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. s Anyone purchasing any products described or contained herein for an above-mentioned use shall: Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. s Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. |
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