Magnetic encoder and its calibration method and calibration device, motor and unmanned aerial vehicle

Abstract

The embodiment of the present invention provides a magnetic encoder, its calibration method and calibration device, a motor, and an unmanned aerial vehicle, belonging to the field of electronic control. The calibration method includes: based on space vector pulse width modulation, controlling the rotor of the three-phase symmetrical motor to rotate step by step with a preset electrical angle increment, so as to drive the rotation of the magnet on the mechanical shaft; detecting angles detected by the magnetic encoder at different first electrical angles during the stepping rotation; and storing the corresponding relationship between the detecting angles and the first electrical angles, so as to complete the calibration of the magnetic encoder. In this way, the calibration between the detection angle of the side-type magnetic encoder and the electrical angle of the three-phase Magnetic encoding can be applied to the angle detection of three-phase symmetrical motors, so as to achieve the purpose of miniaturization design of equipment such as pan and tilt.

Description

technical field [0001] The invention relates to the field of electronic control, in particular to a magnetic encoder, its calibration method and calibration device, a motor and an unmanned aerial vehicle. Background technique [0002] Magnetic encoders are widely used as sensors in angle and position detection due to their non-contact, small size, low cost, simple structure and high reliability. In applications involving motor positioning, such as gimbals, magnetic encoding schemes are usually used to detect the angle and position of the motor. Such as figure 1 As shown, in the current magnetic encoder, the magnetic sensor is usually used facing the magnet. The advantage of this is that the magnetic field generated by the magnet is evenly distributed at the magnetic sensor, and the angular output of the magnetic sensor is linear to the actual mechanical angle of the motor. In this way, the magnetic encoder can basically not be calibrated, or it can be calibrated by connect...

AI Technical Summary

Problems solved by technology

[0003] However, when the magnetic encoder is used in scenarios such as the gimbal of an unmanned aerial vehicle, a miniaturized design is often required

The existing installation method of the magnetic sensor and the magnet facing each other usually requires a space of about 1.5-3mm for installation, which is not conducive to the miniaturization design of the gimbal

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