The Low-Power Directional System Based on the Magnetoresistive Sensor
The system is designed to overcome the low accuracy and the shortcomings of a narrow application area of the traditional compass.It uses HMC1052magnetoresistive sensor to transform magnetic signal into a voltage output.INA332 OPAMP instrument,AMS1117 Voltage regulator,REF3212 reference voltage source are used as signal conditioning and power supply unit.MSP430F147 and single-chip A /D converters are used to process and control signal.Then the directional low-power system with accurate and reliable graphical interface is made.Its internal structure is fixed and can easily formed the interface with other electronic systems.The desrgned system is with significant low-cost,low-power,high-precision features,and magnetic declination correction.
The paper presents an analytical approach to extract machine parameters for creating a machine model under stator turn fault condition for a surface permanentmagnet (SPM) motor. The development of an accurate model of turn faulted SPM motor is essential to study motor and drive behavior under fault conditions, and to develop effective turn fault detection algorithms. The main contribution of the paper is to propose a completely analytical approach to modeling turn fault in SPM machine, which has not been reported so far in literature. Further to validate the analytical method, finite element (FE) analysis of an SPM motor with stator turn fault is performed and the results are compared with the analytical prediction. It is shown that the proposed model achieves good match with the FE results.