This research presents the design and construction of measuring instruments for a dipole magnetic field using a rotating coil technique. This technique is a closed-loop speed-control system where a Proportional-Integral (PI) controller works together with the intensity measurement of the magnetic field through the rotating coil. It was used to analyze the impact on the accuracy of the electromagnetic at speed ranges of 60, 90, and 120 rpm. The error estimation in the measurement of the normal dipole and skew dipole magnet caused by the steady-state error of the speed control system and the rotational search coil in whirling motion are demonstrated. Rotating unbalance, shaft coupling, and misalignment from its setup disturbed the performance of the speed control system as a nonlinear system.

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The electromagnetic in the storage ring is serve to focus the electron beam in vertical and horizontal axis along the beamline. Thus, precision of the electromagnetic field is a crucial step to considering for control the electron motion. The rotating coil is spread technique for measuring the electromagnetic field of magnet. However, the measurement uncertainties of the electromagnetic field are effect to controlled the electron motion before utilizing. This paper examines impact of the errors of the rotating coil magnetic measurement system. The whirling shape in each position along the length of the shaft is used for approximation uncertainty.

The Radial Magnetic Coupling (RMC) is the connected device of the automatic transmission by controlling the power of magnetic coil in order to adjust round speed as needed. The Radial Magnetic Coupling system is non-linear model that make it difficult to design the control system. This paper proposed a sample design for the speed control of the generator with the RMC using second order model. The speed control system with the PI Controller can maintain the speed of the generator that has disturbance such as variable speed outer rotor and load efficiency.