Dynamic balance test method and device thereof

Abstract

The invention provides a dynamic balance test method and a device thereof. The dynamic balance test method is used for testing workpieces with peripheries distributed with grooves uniformly and includes steps as follows: axially rotating a workpiece; utilizing a non-contact sensor to test the grooves on the workpiece at a fixed position and generate a pulse signal, wherein the pulse signal generated by the non-contact sensor when the workpiece begins to rotate is used as an unbalance datum zero-degree signal; dividing frequency of the pulse signal, wherein multiple of frequency dividing is equal to the amount of the grooves on the workpiece; and defining unbalance amount and unbalance angle according to the pulse signal after frequency dividing, wherein a first pulse front edge of the unbalance datum zero-degree signal is used as a zero-angle position of the workpiece when defining the unbalance angle. The dynamic balance test method and the device thereof remove special processes on the surface of the workpiece and save working procedures, thereby increasing positioning accuracy of unbalance angle tests. The dynamic balance test method and the device thereof are adoptable to automation of dynamic balance.

Description

technical field [0001] The invention relates to a dynamic balance detection method and device, in particular to a dynamic balance detection method and device for workpieces with grooves evenly distributed on the outer periphery. Background technique [0002] There is a type of workpiece with grooves evenly distributed on its outer circumference, such as various small armature rotors. This type of armature rotor is usually made by winding an enameled wire on a silicon steel sheet, in which the silicon steel sheet, fan blades and commutation ring are all assembled by a punching machine. When the armature rotor rotates at a high speed, it will generate a lot of vibration, which not only brings a lot of noise, but also shortens the life of the electric tool itself, so dynamic balance correction must be carried out. During dynamic balance detection, the sensor that comes with the balancing machine needs to identify an angle reference signal with the same frequency as the workpie...

AI Technical Summary

Problems solved by technology

[0004] In view of the problems existing in the related art that require special treatment on the surface of the workpiece for passive balance detection to increase the process and generate errors, the purpose of the present invention is to provide a method that directly uses the surface characteristics of the workpiece to obtain the unbalance angle and then find the unbalance position. Dynamic balance detection method and device to solve at least one of the above problems

Images