Trimble S - Page 90

Chapter 3
Theory of Operation
Trimble S, VX, SPS & RTS Service Manual3 - 34 P/N 57150002, Revision 5.0
F
Fig. 3-33 Basic principle
The equation to calculate the force vector F is the known formula:
F= B*I*L*sinA
Fig. 3-34 Magnetic holder principle
The force F is acting on the radius R.
Torque M can then be calculated.
M = B*I*L*R*sinA, Since sinA is 90=1 it can be simplified to:
M = B*I*L*R
Where: F is the force vector (Newton), perpendicular to the plane defined by B and I
B is the magnetic field (Tessla)
I is the current (Ampere)
L is the length (Meter)
SinA is the angle between the current and the magnetic field
F=BIL*sinA
B
I
L
A
Magnets
M
R
B
F
I