Integrated motor rotating speed measuring mechanism of sensor arranged in motor end cover

Abstract

The invention provides an integrated motor rotating speed measuring mechanism of a sensor arranged in a motor end cover. A bearing is embedded into the center of the end cover and plays a role in supporting the rotation of a motor rotating shaft, and the end of the motor rotating shaft is embedded into a bearing inner hole; a radical magnetized permanent magnet steel is arranged in the center of the end face of the rotating shaft and rotates together with the motor rotating shaft, and senses signals in a Hall sensor chip; a circular circuit board is fixed in a circular sunken table in the center of the end cover by using screws; the Hall sensor chip is positioned in the center of the surface of the circular circuit board and used for sensing the rotation of the motor rotating shaft; and one end of a cable is directly welded on the circular circuit board, and the other end of the cable is led out of the end cover through a cable processing hole of the end cover so as to output the signals. By adopting an integrated structure, the rotating speed of a motor rotor is measured more compactly and reliably, and installation and debugging of external devices are avoided. The orthogonal pulse signals can be measured by adopting a counter, so the method is simple and reliable. Because the Hall sensor chip and the motor rotating shaft are arranged in non contact, the reliability is greatly improved.

Description

technical field [0001] The present invention relates to an integrated motor speed measurement mechanism with a built-in sensor in the motor end cover, which is mainly used for the speed measurement of the motor shaft of electric vehicles. Background technique [0002] In the motor control system, the detection of the position and speed signal of the motor rotor is an essential key consideration. Especially in the vector control system, the rotor position is crucial to the accuracy of the magnetic field positioning. The method of photoelectric encoder and resolver is widely used now. Since these two methods generally use formed external installation products, and the installation position needs to be considered on the shaft outside the motor end cover, it brings inconvenience to practical application, and the sealing is also more troublesome; moreover, these products include two parts: rotating and stationary , It is easy to cause out-of-control problems due to improper in...

AI Technical Summary

Problems solved by technology

Since these two methods generally use formed external installation products, and the installation position needs to be considered on the shaft outside the motor end cover, it brings inconvenience to practical application, and the sealing is also more troublesome; moreover, these products include two parts: rotating and stationary , it is easy to cause out-of-control problems due to improper installation, and the reliability of its operation is not as good as that of the non-contact method

The use of resolvers is relatively complicated, requiring excitation signals, and there are two sets of standing wave outputs. Complicated calculations are required to obtain rotor position information, and the cost of high-quality resolvers is also high.

Therefore, in terms of convenience, reliability and cost, the methods of photoelectric encoder and resolver have some shortcomings.

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