Mitsubishi Electric MELSERVO-J5 Series User Manual page 6

The magnetic fluxes generating from the permanent magnet disperse in the air from the magnet face side (facing the primary
side), and most of them do not leak to the mounting part (yoke) surface side for its structure.
Because of this, a magnetic attraction force occurs on the magnet face side of the secondary side, not on the mounting part
(yoke) surface side.
Magnet side face...Dispersion of magnetic fluxes
Generating magnetic attraction force
Permanent magnet
North pole
Mounting
part (yoke)
Mounting part side face...No dispersion of magnetic fluxes
Not generating magnetic attraction force
The permanent magnet used for the linear servo motor is very strong.
When an A4-sized iron sheet is fully attracted, the magnetic attraction force becomes as high as 2.5 t. Use abundance of
caution with the handling.
Magnetic attraction force = 400 [kPa]
If an A4-size iron sheet is fully attracted
A4
(21 × 29.7 cm)
For safety
The magnetic attraction force is in inverse proportion to square of the distance to a magnetic body, so it drastically increases
when the distance becomes small.
When mounting the secondary side of linear side motor, ensure the sufficient distance from the magnetic bodies around it and
securely fix those magnetic bodies.
4
Magnetic
fluxes
South pole North pole
Approx. 2.5 t