No. 4263-11/11

LB1823

14. Servo constants

The servo constant calculation varies significantly with the motor used, and requires specialized know-how. Thus

this should be handled by the motor manufacturer. We can provide the IC characteristics data required for the servo

constants calculations as well as frequency characteristics simulation data for the filter constants set by the motor

If R4 is too large, speed errors will be likely to occur due to the speed discriminator cutoff current and the integrator

input current. Therefore, we think that a value in the range 10 to 100 k

Ω is appropriate. If the resistor between P

OUT

will be degraded. Therefore, this resistor should not be too small. (We recommend a value of about 1 M

Ω when R4

is 75 k

Ω.) First determine the constants for the speed discriminator system only (R4, R5, C6 and C7), and then

determine the value of R3 in the PLL system.

This catalog provides information as of January, 1997. Specifications and information herein are subject to

change without notice.

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