The 'S' series shaft motors from Micromech are a very simple design, have very high accuracy and 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.
Suitable for use in vacuum environments, shaft motors are a simple construction that use magnetic circuits consisting only of permanent magnets and coils and which result in a wide range of characteristics. The characteristics include precision positioning, high and low constant speed performance thus making the range of applications extremely diverse. Furthermore the 'S' series has combined linear encoders, encoder guides and mechanical systems to meet customers' requirements making them ideal actuators for their individual applications.
When comparing these shaft motors to the more commonly known linear motors there is another difference besides the obvious that one is cylindrical and the other is flat. The standard versions of most motors including linear motors is that the circuits are made of magnetic iron while shaft motors are not. For this reason there is no adsorption force between the shaft and forcer (coil) thereby totally eliminating cogging.
A further outstanding feature of shaft motors is they are capable of amazingly high thrust for example 2340 N with a single forcer and 9360 N using four forcers (parallel plus tandem drive). The 'S' series is very quiet due to the absence of friction; the only mechanical contact section is the linear guide. This can be improved still further using an air slider 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 to8um/s and virtually no speed fluctuations ±0.006% 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 customers' particular requirements.