Chapter 3
Theory of Operation
P/N 57150002, Revision 5.0 3 - 31 Trimble S, VX, SPS & RTS Service Manual
F
Servo drive system
The Trimble S6 Total Station incorporates a revolutionary servo angle system called MagDrive
TM
servo technology. MagDrive servo technology is based on a direct drive and frictionless
electromagnetic drive technique. The direct drive system allows the servo motors to be mounted
directly on the horizontal and vertical axis, removing the need for additional mechanical gearing. The
integration with the angle sensor enhances the speed of the servo motors by providing fast angle
values to be used by the servo processor. MagDrive servo technology provides high accuracy, high
speed turning servo capabilities with low power consumption. The frictionless motion also removes
servo noise and reduces instrument wear. The system provides endless motion in horizontal and
vertical direction including endless fine adjustment without mechanical clutches.
The angle sensor is integrated with the servomotor and built into the servo housing on the same axis.
The motor winding is attached to the angle board and final calculations of angle values are made in
the IPC board. No additional encoder or tachometer will then be needed in the system. The main angle
sensors will give a direct, fast feedback to the servo controller.
With this motor design the transmission of force from the motor to rotate the instrument will take
place non-contacting, frictionless, according to known electro-magnetic field theory. The motor is
designed with a magnet holder containing magnets and soft iron areas distributed in two concentric
cylindrical structures separated by an air gap, in which there is space for the cylinder formed motor
winding. To drive the motor a current is fed through the motor winding generating a force to rotate
the magnet holder and the instrument.
This motor design will create an exceptional performance compared to conventional technique:
• Fast and accurate system
• Very low noice level
• No wear of component
• Low weight and power consumption
The servo system uses the angle system for position angle feedback information and commutation of
electrical phases.
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