
2.SELECTION METHODS CONFIGURATIONS AND SELECTION B-65222EN/03
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2.1 COIL SLIDER SELECTION
A coil slider should be selected according to the following items.
NOTE
For information related to the motor specifications,
also see Part I, "SPECIFICATIONS."
2.1.1 Load Force
The load force means the whole load on a motor. That is, the weight
of the movable objects including the weight of the motor itself,
magnetic attraction between the coil slider and magnet plate, and
items related to the friction in the machine such as the friction
coefficient must be considered. This value is always required for
selecting a motor. An example of calculation is shown below:
- Motor model: 9000B/2
Movable part: Slider
Weight of the slider: 34 kg
Magnetic attraction: 27,000 N
- Weight of movable objects (not including the motor): 300 kg
- Friction coefficient: 0.02
When the above conditions are assumed:
Load force=í(300+34)×9.8+27000ý×0.02
605[N]
2.1.2 Required Maximum Force
The required maximum force means the force required for
implementing desired acceleration and maximum speed when the load
force described above is present. Make sure that the maximum force
in the motor specifications is not less than the required maximum
force. When checking the requirement, it is desirable to allow a
margin of about 10% by taking a load variation into account. An
example of calculation is shown below:
- Load force: 605 [N] as calculated in the previous subsection
- Acceleration: 1.5 G
- Maximum speed: 1.5 m/sec (90 m/min)
- Other conditions are the same as those listed in the previous
subsection.
When the above conditions are assumed:
Required maximum force= (300+34)×9.8×1.5+605
5515[N]
The maximum force of the 9000B/2 is 6,300 N at 1.5 m/sec as listed
in Part I, "SPECIFICATIONS," and therefore has a margin of 13.5%
for the required maximum force of 5,515 [N].