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Micromech has brought out the ‘S’ series Nippon shaft motors, which have high accuracy and are non-contact.

Shaft motors are direct-drive linear servomotors that consist of a shaft with laminated magnets and cylindrically wound coils controlled by the flow of current.

Shaft motors use magnetic circuits consisting only of permanent magnets and coils.

The characteristics include precision positioning and high and low constant-speed performance, thus making the range of applications extremely diverse.

The ‘S’ series has combined linear encoders, encoder guides and mechanical systems to meet customer requirements.

The standard versions of most motors, including linear motors, are made of magnetic iron while shaft motors are not.

For this reason there is no adsorption force between the shaft and forcer (coil), which eliminates cogging.

Shaft motors are capable of high thrust; for example 2340N with a single forcer and 9360N using four forcers (parallel plus tandem drive).

The ‘S’ series is quiet due to the absence of friction; the only mechanical contact section is the linear guide.

An air slider can make this even quieter where full non-contact operation is possible.

The coreless construction reduces overall weight and the simplified unit construction allows a stroke of up to 3.8m with high resolution of 0.14m, which is ideal for precision positioning.

There is a high-speed drive delivering 6.5m/s and low-speed drive down to 8um/s and virtually no speed fluctuations (+/- 0.006 per cent at 100m/s).

The shaft motors are a rugged and durable construction, capable of operating in a vacuum but compact and lightweight compared with other linear motors.

For volume applications they can be designed as optimum actuator modules that maximise their features to meet customer requirements.

The single-shaft drive uses a control system matched to the combination of a shaft and a forcer so the control system can suit specific requirements, even for complex movement.

The x and y shafts can be used to create an xy stage.

The multi-drive multiple forcer can be controlled by a single shaft, thereby supporting complex movement.

The parallel drive is effective for driving large or heavy objects.

Tandem drive can increase the thrust by combining the forcer.

Shaft motors can be used in a diverse range of practical applications, such as precision positioning, operation under adverse environmental conditions, and for conveying heavy loads.

They are suitable for: conveying heavy loads such as clinical equipment or for use on factory production lines; use in quiet surroundings such as test laboratories or medical facilities; high precision conveying of large devices such as LCDs over long distances; precise positioning for semiconductor systems; high-throughput conveying for the printing of line head drives; equipment that is difficult to handle using ballscrews; and constant-speed drug dispensing that is difficult using ball screws.

Shaft motors operate in production locations where water or oil is used, or in a vacuum.


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