Limited angle motor rotor angle detection method

Abstract

The invention discloses a limited angle motor rotor angle detection method, which comprises the following steps that: firstly, a rotor angle detection system is arranged on a limited angle motor and comprises a first permanent magnet, a second permanent magnet, a third permanent magnet, a fourth permanent magnet, a detection circuit board and a high-precision position encoder; the detection circuit board is provided with a calibration module and a detection module; constructing a corresponding relation between the voltage mean value of each step of the complete stroke of the motor and the number of the voltage mean value through a calibration module, forming an angle query table, and storing the angle query table into an ROM (Read Only Memory) table; the detection module obtains a rotation angle through table look-up according to a voltage value input by rotation of the motor. The method provided by the invention can reach micro-arc level measurement precision in practical application, and has the characteristics of low cost and high cost performance.

Description

technical field [0001] The invention belongs to the technical field of motors, and in particular relates to a method for detecting a rotor angle of a limited-rotation-angle motor. Background technique [0002] Motor is an actuator that is widely used in people's daily production and life. In many applications, it is necessary to precisely control the rotation angle of the motor, such as the actuator motor of the servo mechanism in the pod, and the camera dynamic for photographers to take pictures. The drive motor of the servo-stabilized platform, etc., for the acquisition method of the motor rotation angle, it is currently mainly divided into two categories: inductive method and non-inductive method. [0003] The sensing method is to install a high-precision angular position encoder at the back end of the motor to obtain the precise position of the motor. The advantage is high precision and simple calculation; the disadvantage is that the sensor size is large, which increas...

AI Technical Summary

Problems solved by technology

In order to precisely control the angular position of the motor within a limited range in similar applications, one way to obtain the angular position is to install an encoder at the rear end of the motor. Obviously, the encoder will increase the axial volume of the motor, so it is impossible It meets the thickness requirements of the optical drive; another method is to use a non-inductive method. Although it can meet the axial space requirements, it is difficult to guarantee the accuracy of the position acquisition of the motor at low speeds and ultra-high speeds.

Therefore, the traditional sensing and non-sensing angle position acquisition methods cannot meet this specific demand.

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