Calibration method of hub motor signal detection device

Abstract

The invention relates to a high-precision wheel hub motor applying a position detecting device. The high-precision wheel hub motor comprises a motor shaft and a stator arranged on the motor shaft in a sleeving mode, and the stator is sleeved with a rotor; a signal detection device is used for detecting a magnet ring signal and calculating a magnet ring rotating angle position. A calibrating method of the signal detection device comprises the steps of setting an error range which can accept signal deviation; locking the rotor to the zero degree of the electrical degree and obtaining the detected numerical value of the signal detection device, wherein the detected numerical value is the needed null point value; locking the rotor at different electrical degrees and reading the detected numerical value of the signal detection device, and comparing the deviation value of every two electrical degrees and the actual deviation value of detected numerical value, corresponding to the two electrical degrees, of the signal detection device; judging whether or not the actual deviation value is within the deviation and error range of expected deviation; if yes, conducting calibration; if no, judging the calibration to be a failure. The design is simple, the installation can be easily achieved, the precision degree is high, and the application range of the wheel hub is sharply widened.

Description

technical field [0001] The invention relates to the field of hub motors, in particular to a high-precision hub motor using a position detection device. Background technique [0002] In-wheel motor technology, also known as in-wheel motor technology, is characterized by the integration of power, transmission and braking devices into the wheel hub, thus greatly simplifying the mechanical parts of electric vehicles. Since the in-wheel motor has the characteristics of independent drive of a single wheel, no matter it is front-wheel drive, rear-wheel drive or four-wheel drive, it can be easily realized by the left and right wheels, and the full-time four-wheel drive is very easy to realize on the vehicle driven by the wheel hub motor; The motor can achieve differential steering similar to that of a tracked vehicle through the different speeds of the left and right wheels or even reverse rotation, which greatly reduces the turning radius of the vehicle. In special cases, it can al...

AI Technical Summary

Problems solved by technology

[0004] The precise control of the hub motor requires the use of a position detection device in the hub motor. Due to its structure and operating environment, there are many difficulties in realizing precise control in practice. The dynamic and impact ability is not strong, so it is not suitable for the position detection device of the hub motor

The magnetoelectric position detection device can overcome the shortcomings of the photoelectric position detection device, but the traditional magnetoelectric position detection device has relatively low measurement accuracy and can only achieve incremental output

[0005] At present, there are solutions based on the installation of position sensors for hub motors on the market, but they are relatively complicated and not practical.

[0006] Patent 201520254054.0 A hub motor with high-precision speed feedback and its electric balance car: Due to the complicated installation and damage to the end face, it is extremely difficult for the detection IC to reach the temperature range

It cannot be realized in the case of end-face integration;

[0007] Patent 200910137765.9 Integrated hub motor: Due to the complicated installation, the integrity of the end face cannot be guaranteed, and the detection method is very complicated, and the position detection signal line needs to run through the entire motor shaft, so the process is complicated and difficult to realize;

[0008] Patent 201010175962.2 A brushless DC motor with an encoder: it is installed inside the motor, the process is complicated, and it is extremely difficult for the detection IC to reach the temperature range, which is very difficult to realize

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