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Chapter 9 Setup
9–10
9-3 Initial setup of the linear servo system
The motor is driven by the magnetic force created by the coil and the magnetic force of the permanent
magnet. Thus, it is necessary to comprehend at which pole of the permanent magnet the coil is
located. With the conventional rotary motor, the coil and permanent magnet are located in the motor,
and the relation of the two parts is fixed. The relation of the detector installed on the motor and the
motor itself is also fixed.
With the linear servo system the coil (motor primary side), permanent magnet (motor secondary side)
and linear scale are independently installed, so the pole must be adjusted according to the linear
motor and linear scale relation.
If this pole is not adjusted, the motor may not operate or may not operate correctly.
The magnetic pole adjustment method is explained in this section.
9-3-1 Installation of linear motor and linear scale
The installation direction of the linear motor and linear scale is explained in this section.
(1) Linear motor's magnetic pole direction
The magnetic pole direction of the linear motor is shown below. As shown in the drawing, if
moved in the direction having the power line connector or MDS-B-MD installation hole, the pole
will move in the minus direction. If moved in the opposite direction, the pole will move in the plus
direction.
Power line connector
Motor secondary
side
Plus direction
Minus direction
MDS-B-MD installation hole
Motor primary side