Generally, the more components in a motion system, the larger the size, and the more opportunity for mechanical error in the system. Such error impacts accuracy and repeatability, and ultimately depends on the machining tolerances of the components that marry together.
To minimize overall system size and improve dynamic performance, the Micro Plus Linear Positioning Stages use built-in servo motors. The integrated design consists of a linear-bearing structure, a precision-grade ballscrew with integral motor, encoder, and housing.
"In our configuration," says Director of Marketing Alan Feinstein, "the ballscrew is the motor shaft." The magnetic rotor assembly is configured directly on the ball screw, and a rotary encoder senses position directly from the screw shaft.
This design eliminates mechanical errors and compliant parts such as motor mounting brackets and flexible couplings that introduce translation error. In essence, the design uses a longer screw, with motor-shaft dimensions turned directly into it.
"Traditional linear-slide designs use bearing- and motor-mounting plates to mate with the motor," Feinstein explains, "and a coupling connects the motor shaft to the ballscrew. We eliminate the motor, in terms of the motor mounting, the coupling, and its own bearing structure." The ballscrew's angular-contact bearings support the motor, eliminating the need for additional motor bearings and time-consuming alignment.
Additional Details...Contact Lisa Hatch, Bayside Motion Group, 27 Seaview Blvd., Port Washington, NY 11050; Tel: (516) 484-5353; FAX: (516) 484-5496; www.baysidemotion.com