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Tubular linear motors accept three phase
By Norman Bartlett -- Design News, March 22, 1998
Recent introduction of a three-phase tubular linear motor from Linear Drives Ltd. allows greater flexibility in system design. "The three-phase output of virtually any industry-standard servo amplifier can be converted into a direct-thrust linear motion with twice the performance of previous motors," claims CEO Hugh-Peter Kelly.
By using three-phase, the new LD Series motors are considerably more responsive and have higher peak performance than two-phase units. Higher voltages can be used which translate to faster top speeds--for example, 8 m/sec on short-duty cycles. Better acceleration/deceleration accompanies improved speed.
Key components include a thrust rod and motor thrust block. The thrust rod contains a series of permanent magnets that form the magnet core. The motor thrust block functions as the load-bearing housing, enclosing the motor coil. A large air gap between rod and motor eliminates precision alignment while the design's inherent magnetic flux maintains even force.
Depending on application, the core technology is available
- as a powered version suitable for a machine builder with an existing bearing setup,
- on a bearing rail as a motor module to users of an existing brushless servo drive,
- in a powered form as a complete payload to fit on a machine.
Additional details, contact: Linear Drives Ltd., Luckyn Lane, Basildon, Essex SS14 3BW, UK, Tel: +44 1268 287070, FAX: +44 1268 293344.
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