The Nippon Pulse Linear Shaft Motor is little bit special

The Nippon Pulse Linear Shaft Motor is little bit special
Many of you already know what a Linear Shaft Motor comprises of, how it works and its benefits but our editor came across this article by Nippon Pulse and thought it useful for those not quite so familiar with the product. The extra features of the Nippon motor however make this linear motor a bit special.

The underlying motor technology is a high precision direct drive linear servomotor, consisting of a shaft of Rare Earth-Iron-Boron Permanent (NIB) Magnets and a ‘forcer’ of cylindrically wound coils which can be supplied with optional Hall Effect devices.

Nippon Linear Shaft MotorThe shaft supplies the magnetic field which the forcer acts upon. The forcer assembly, combined with the amplifier and control electronics, produces the force for the motor. The Hall Effect devices can be supplied, if required by the selected servo driver for proper commutation of a brushless linear motor, and are integrated into the forcer assembly.

The Linear Shaft Motor (LSM) was designed with three basic design concepts: Linear Shaft Motors must be simple, they will consist of only two parts, a magnetic shaft and a ‘forcer’ of cylindrically wound coils and will provide ultra high precision.

They have no iron in the forcer or shaft thus giving the precision and zero cogging expected in a coreless design. The coils of the LSM themselves form the core thus giving you the stiffness expected in an iron cored motor. The LSM is non-contact and since the coil completely wraps around the magnets, all the magnetic flux is efficiently used. This allows for a large (0.5 to 2.5mm) nominal annular air gap. This air gap is non-critical, meaning there is no variation in force as the gap varies over the stroke of the device.

The basic design of the LSM is that the magnetic structure of the shaft is built in such a manner that there is no space between each magnet and is fully supported within itself. The magnetic structure is then inserted into a protective stainless steel tube. This patented process is protected by numerous patents throughout the world. The patented process used by the LSM produces a very strong magnetic field, which is twice that of other linear motors.

The forcer construction has the coils of the Linear Shaft Motor in a cylindrical format, thus providing a number of key advantages over other linear motors.  The cylindrical design of the coils makes the coil assembly very stiff without the use of external stiffening materials, such as the iron used by platen style linear motors.  The coils surround the magnets allowing for the optimal use of all the magnetic flux. This makes the air gap non-critical. As long as the forcer does not come in contact with the shaft there is no variation in the linear force. The magnetic flux cuts motor windings at right angles for max efficiency and all sides of the coil are positioned to allow for maximum dissipation of heat.

The result of these novel and patented designs has produced a linear shaft motor requiring less current and less mass to produce a similar force compared to the competition. Or put another way, this is almost certainly a more efficient product than any other linear motor on the market.

Micromech is the sole UK agent and distributor for Nippon Pulse products and if you wish to find out more about these motors then contact Stirling Morley on 01376 333333 or stirling@micromech.co.uk

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