Motor back electromotive force signal acquisition equipment for motor contact rotating speed tester

Abstract

The invention discloses a motor counter electromotive force signal acquisition device for a motor contact rotating speed tester, which comprises a differential signal processing unit for acquiring an original counter electromotive force signal of a tested motor, automatically adjusting amplification gain according to a voltage gear of the original counter electromotive force signal and a corresponding amplification factor gear, and outputting the amplification gain to the motor contact rotating speed tester; after being amplified, the original counter electromotive force signal is output to the AD conversion unit, and a voltage gear identifier is sent to the AD conversion unit; the AD conversion unit is used for performing AD conversion on the motor back electromotive force signal to obtain a motor back electromotive force digital signal; the AD signal reading unit is used for restoring the motor back electromotive force digital signal according to the amplification factor gear identifier and the corresponding amplification factor to obtain a motor back electromotive force digital signal with the amplitude consistent with that of the original motor back electromotive force signal; the communication unit synchronously transmits the motor back electromotive force digital signal to an upper computer in real time; and the upper computer data reading unit is used for drawing the received motor back electromotive force data into a motor back electromotive force curve.

Description

technical field [0001] The invention belongs to the technical field of contact speed testers, and in particular relates to a motor back EMF signal acquisition device for a motor contact speed tester. Background technique [0002] The contact speed of the motor is that after the motor is powered off, the rotor body of the motor continues to decelerate by inertia. ) time, the corresponding speed at this time is the motor contact speed. [0003] The motor contact speed tester can get the load torque, friction torque, inertia time, contact speed, stop speed, slip time, suspension time and other parameters of the motor by testing the back EMF signal after the motor is powered off. The performance provides a test method, through which the design and process improvement of the motor can be carried out in a more targeted manner, and the performance and reliability of the motor can be improved. [0004] At present, the existing solutions can only directly collect and upload the bac...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: to overcome the defects of small sampling range, low sampling accuracy and poor communication reliability of the current motor contact speed tester, and provide a motor back EMF signal acquisition device for the motor contact speed tester to realize mV Up to 100V large-scale high-precision back EMF acquisition

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