Research On Shaft Angle Encoder Based On Hall Sensor

With the continuous improvement of the level of intelligence in life,more intelligent fields have gradually increased the requirements for shaft angle encoders,making high-precision shaft angle encoders used in more fields.Magnetic shaft angle encoders are an emerging industry,so Attention has been paid,so the research on magnetic shaft angle encoders will become an important development trend,so the paper studies Hall shaft angle encoders.Based on the 32-bit processor of STM32F407,a four-phase quadrature Hall shaft angular encoder array structure was designed.The eight Hall elements were placed orthogonally to each other under the permanent magnets perpendicular to the radial direction as a signal generation scheme.Ansys Workbench software was used to analyze the magnetic field of the radial permanent magnets and improve the structure.Used the FPU Hardware improves the speed of convolution operation,and used AD8221 differential amplifier circuit and AD7606 analog-to-digital conversion circuit to improve resolution.Used a four-phase differential signal processing algorithm,increasing the number of subdivisions indirectly increased the linearity of the voltage curve,and reduced errors such as mechanical jitter and temperature drift.Used DM3058 E digital multimeter,DP832 DC stabilized power supply and other experimental instruments to built a variety of calibration platforms for calibration and testing.The measurement results show that the resolution of the prototype was 5423 p/r,the relative error was 0.84%,and the integration,low power consumption,Hall shaft angle encoder with strong portability.