
11.SPINDLE SPEED FUNCTION B-63943EN-1/02
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11.11.1 Connection Among Spindle, Spindle Motor, and Position
Coder
As shown in the figure below a gear ratio can be inserted between the
spindle and spindle motor (n : m), and between the spindle and
position coder (N : M).
Spindle control
Spindle
amplifier
Spindle motor
Spindle
Gear ratio n:m
Error
counter
Gear ratio N :
Position
coder
The number of pulses per position code
revolution is set in parameter No. 3720.
Fig. 11.11.1 (a) When a position coder is externally attached (on the
spindle side)
Spindle control
Spindle
amplifier
Spindle
motor
Spindle
Position coder
Error
counter
Gear ratio n : m
N : M
The number of pulses per position code
revolution is set in parameter No. 3720.
Fig. 11.11.1 (b) When a position coder is built into a spindle motor
(1) Gear between spindle and spindle motor
Up to three gear stages (machining center system) or four gear stages
(lathe system) can be provided between the spindle and the spindle
motor.
The gear ratio is arbitrary. The distance of spindle rotation per
revolution of spindle motor is different, based on the gear ratio. The
speed command to the spindle motor will be adjusted.