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Appendix Ⅰ Servo system application

Ⅰ-1

Ⅰ.1 Position control application

The electronic gear enable the workpiece movement distance per input reference command

pulse from the host controller to be set to any value. One reference command pulse form the

host controller, that is the minimum position data unit, is called a command unit.

[ Electronic gear ratio setting ]

Input

command pulse

Servo Drive

S M

Servo Motor

Electronic gear

DEN

NUM

ratioReduction

uni

Comman

4pulseencoder motor ofNumber

)

DEN

NUM

ratio(gear Electronic ×

♥ Reduction ratio is load shaft revolution over motor shaft revolution

♥ The command unit shows the minimum command unit of the position data to move the load.

♥ Encoder pulse rate

Encoder type Number of motor encoder pulse (ppr)

Incremental

encoder

2000 ~ 6000

Absolute 11bit 2048

Serial 17bit 32768

※ Setting method of electronic gear

① Check the mechanical specification including reduction ratio, ball screw pitch etc.

Deceleration ratio

Pitch (P)

② Determine the minimum unit(command unit) of the position data while feeds load per pulse.

: When moving the table by 0.001[mm] for 1[Pulse], the command unit is 0.001[mm].

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