System and method for detecting defects of micromotor rotor windings

Abstract

The invention provides a system and method for detecting defects of micromotor rotor windings. According to the system and method, pulse square waves with specified peak values and frequencies are exerted to a tested rotor winding, response signals and standard rotor winding signals are collected, compared and analyzed, and whether the rotor winding has faults and fault modes are judged. The corresponding detection system comprises a pulse generator, a rotor winding, an integral circuit, an A / D switching circuit, a controller, a display terminal and a motor. The pulse generator exerts pulse signals on the rotor winding, and the integral circuit is connected to the two ends of each commutator bar of the rotor winding in parallel; the A / D switching circuit collects voltages at the two ends of an integrating capacitor C in the integral circuit and converts the voltages to digital signals which are transmitted to the controller; the motor is controlled by the controller to drive the rotor winding to rotate to the next set of commutator bars; the controller outputs an operation result to the display terminal. By means of the system and method, the states of the rotor winding can be automatically, quickly and accurately detected, a production line is optimized, and the yield of an assembly line is improved.

Description

technical field [0001] The invention relates to automatic detection technology and belongs to the field of motor detection, in particular to a defect detection system and method for a rotor winding of a micro-motor. Background technique [0002] With the development of society and the advancement of science and technology, micro-motors are more and more widely used in mobile phones, audio-visual products and other fields, and people's performance requirements for micro-motors are becoming more and more stringent, which puts forward higher requirements for motor production testing . [0003] In the process of motor production inspection, rotor winding faults are the main faults, including: disconnection, virtual welding and inter-turn short circuit, and the inter-turn short circuit fault of winding is the most difficult to detect. The existing detection method is to use a micro-ohmmeter to measure the winding resistance, or to add pulses to the winding, and to detect the win...

AI Technical Summary

Problems solved by technology

This detection method completely depends on manually reading the resistance value of the micro-ohmmeter, or manually observing the waveform on the oscilloscope to judge whether the rotor is qualified. Not only the detection efficiency is low, but the accuracy rate is not high. Wrong phenomenon

[0004] And the existing detection equipment is basically a large-scale motor winding fault detector, and the micro-motor winding detection equipment is relatively small

There are some micro-motor comprehensive testers on the market, all of which are used to test the finished motor. It is impossible to find the fault of the rotor winding during the production and assembly stage, and it cannot reduce the product rejection rate.

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