Linear Shaft Motor 50% More Efficient than Coreless Linear Servos

Nippon Pulse’s Linear Shaft Motor is the first linear servomotor designed and constructed with the ultra high-precision market in mind, but also provides energy efficiency that is up to 50 percent better than competing coreless linear motors, a claim independently verified (see below).

The simple design of the Linear Shaft Motor (it consists of only a forcer {coils} and shaft {magnet}), is one of the primary factors in its energy efficiency.

Because the coils are completely wrapped around the magnets, 100 percent of created magnet flux cuts the coils at 90 degrees, which, as highlighted by Fleming’s left hand rule, is the optimal crossing vector in linear motion.

The Linear Shaft Motor also reduces the amount of generated heat, and heat’s impact on the work point, which further increases energy efficiency. The decreased impact of heat also is a factor in the Linear Shaft Motor’s ability to achieve sub-micron resolution.

• Two-part simple design, forcer (coils) and shaft (magnets)
• Uses 100 percent of all magnetic flux, which cuts magnet at 90 deg.
• Non-critical air gap, making machining easier and more cost efficient
• High-speed (10m/s and acceleration up to 20G)
  Low-speed (8um/s)

• High thrust capabilities, up to 100,000N
• Very low speed fluctuation (±0.006% at 100mm/s)
• Allows for use in parallel using only one encoder and one drive
• Operation ability within harsh environments and in vacuums