
2.MECHANICAL DESIGN HANDLING, DESIGN, AND ASSEMBLY B-65222EN/03
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2.9 VERTICAL AXIS BALANCER
If a linear motor is used with the vertical axis when no balancer or
mechanical brake mechanism is used, the linear motor needs to
preserve its position with the continuous rated force that can be output
by the linear motor. If a stop state is caused for a long time by a force
greater than the continuous rated force, the probability that an
overheat occurs increases. Since the continuous rated force of a linear
motor is relatively small, a balancer is often required with the vertical
axis. If the power to the machine is turned off, a gradual drop occurs
with the vertical axis. To prevent this from occurring, a balancer may
be required.
If the acceleration exceeds 1 G, a balancing effect using a counter
weight cannot be achieved. In such a case, a balancer that dissipates
less heat and has a superior response characteristic is needed.
Many types of balancers are available: weight, pneumatic balancer,
hydraulic balancer, and so forth. Select a balancer that is most
suitable for a machine designed. If the friction of a balancer is large,
heat can be generated, or a backlash can be caused when a reverse
axis operation is performed. Be careful at the time of design.