CN-121978525-A - Durable testing device for permanent magnet stepping motor

CN121978525ACN 121978525 ACN121978525 ACN 121978525ACN-121978525-A

Abstract

The invention relates to the technical field of motor testing, in particular to a durable testing device for a permanent magnet stepping motor, which comprises a testing machine, a driving piece, a piece to be tested, an electrical sensor and a grounding wire, and is characterized in that: the electromagnetic damping type electromagnetic testing machine also comprises an electric measurement shielding shell, an electric isolation signal transmission shaft, a fixing plate, a bidirectional cam, an electromagnetic isolation assembly, an electric measurement signal transmission connection assembly and an electromagnetic damping type current discharging assembly, wherein the electric measurement shielding shell is fixed in the testing machine; the invention solves the problems of thermal attenuation, electric corrosion and distortion of test results caused by electromagnetic interference in the permanent magnet type stepping motor endurance test in the prior art by adopting a mode of cooperative matching of the electric measurement shielding shell, the electric isolation signal transmission shaft, the bidirectional cam, the electromagnetic isolation assembly, the electric measurement signal transmission connection assembly and the electromagnetic damping type current discharge assembly, and has the remarkable advantages of high precision, high reliability and long service life test.

Inventors

YU LIXIN
GU XUDONG
QIAN MINXIA

Assignees

常州市丰源微特电机有限公司

Dates

Publication Date: 20260505
Application Date: 20260403

Claims (10)

1. The utility model provides a durable testing arrangement for permanent magnet type step motor, includes test machine, driving piece, awaits measuring piece, electrical sensor and earth connection, its characterized in that: the electromagnetic isolation assembly is arranged in the electric measurement shielding shell and connected with the electric isolation signal transmission shaft, the electric measurement signal transmission connection assembly is arranged at the left end of the electric isolation signal transmission shaft and connected with a piece to be tested, a gap between the electromagnetic damping type current discharge assembly and the bidirectional cam is filled with conductive grease to form a low-impedance path for dynamic charge, the electric isolation signal transmission shaft is fixedly connected with a rotating shaft of a driving piece, the bidirectional cam is fixed at the middle part of the electric isolation signal transmission shaft, the electromagnetic isolation assembly is arranged in the electric measurement shielding shell and connected with the electric isolation signal transmission shaft, the electric measurement signal transmission connection assembly is arranged at the left end of the electric isolation signal transmission shaft and connected with the piece to be tested, the gap between the electromagnetic damping type current discharge assembly and the bidirectional cam is filled with the conductive grease to form a low-impedance path for dynamic charge, the electric isolation signal transmission shaft drives the bidirectional cam to rotate simultaneously when driven by the driving piece to rotate forwards and rotate synchronously, the bidirectional damping type current discharge assembly stops rotating synchronously under the action of the electromagnetic isolation assembly under the condition that the electromagnetic isolation assembly is stopped under the action of compression, the electromagnetic damping type current discharge assembly is temporarily released under the condition that the electromagnetic damping type current discharge assembly is not compressed under the condition of the compression condition of the bidirectional damping type vibration isolation assembly is temporarily released when the bidirectional damping type current discharge assembly is driven by the driving piece, and the bidirectional damping type current discharge assembly is temporarily released under the compression condition of the test assembly is under the condition of the test, so that the bidirectional cam and the electrically isolated signal transmission shaft stop rotating forward rapidly.
2. The device for testing the durability of the permanent magnet stepper motor of claim 1, wherein the electromagnetic isolation assembly comprises two groups of isolation matching grooves and two groups of isolation meshing teeth, the two groups of isolation matching grooves are symmetrically formed in the inner wall of the electric measurement shielding shell, the two groups of isolation meshing teeth are symmetrically fixed on the surface of the electric isolation signal transmission shaft, the isolation meshing teeth are connected with the isolation matching grooves in a clamping mode, and an extremely small gap is kept between the isolation meshing teeth and the isolation matching grooves and is filled with conductive grease.
3. The device for testing the durability of the permanent magnet stepper motor of claim 1, wherein the electrical measurement signal transmission connection assembly comprises a fixed seat, a clamping ring, a connecting shaft, a measurement signal connection groove and a measurement signal conversion block, the fixed seat is fixed at the left end of the electrical isolation signal transmission shaft and is positioned at the left side of the electrical measurement shielding shell, the clamping ring is arranged at the top end of the fixed seat, the left end of the connecting shaft is fixed at the end part of a rotating shaft of a piece to be tested, the right end of the connecting shaft extends into a groove formed by combining the clamping ring and the fixed seat, the measurement signal connection groove is symmetrically arranged at the top end of the fixed seat, the measurement signal conversion block is symmetrically fixed at the bottom end of the clamping ring, and the measurement signal conversion block is connected with the measurement signal connection groove in a clamping mode.
4. The durability test device for a permanent magnet stepper motor of claim 3, wherein the inner shaft center of the fixing base is provided with a connecting guide groove, the right end of the connecting shaft is fixedly provided with a connecting guide block, and the connecting guide block is in clamping connection with the connecting guide groove.
5. The durability test device for a permanent magnet stepper motor of claim 4 wherein positioning grooves are symmetrically formed in the upper end and the lower end of the right side of the connecting shaft, positioning pieces are fixed on the inner sides of the fixing seat and the clamping ring, and the positioning pieces are connected with the positioning grooves in a clamping mode.
6. The device for testing the durability of the permanent magnet stepper motor of claim 3, wherein the outer side of the measuring signal converting block is provided with a locking hole, the inner side of the measuring signal connecting groove is provided with a screw hole in a penetrating way, the screw hole penetrates to the outer side of the fixing seat, and the outer side of the fixing seat is provided with a bolt penetrating through the inner side of the screw hole and connected with the locking Kong Ningge.
7. The device for testing the durability of the permanent magnet stepper motor of claim 1, wherein the electromagnetic damping type current discharging assembly comprises an inner groove, a fixed column, a buffering telescopic rod, a telescopic spring, a roller and a plunger, wherein the inner groove is formed in the inner wall of the electric measurement shielding shell in a circular array mode, the inner groove is located between two groups of isolation matching grooves, the fixed column is fixed in the inner groove, the buffering telescopic rod is arranged in the fixed column, the top end of the buffering telescopic rod extends out of the fixed column, the telescopic spring is sleeved on the surfaces of the buffering telescopic rod and the fixed column, the bottom end of the telescopic spring is connected with the bottom end of the fixed column, the roller is fixed at the top end of the fixed column, the plunger is fixed at the end of the roller, and the plunger is arranged in a trough of the bidirectional cam.
8. The device for testing the durability of a permanent magnet stepper motor of claim 7 wherein said roller has a micrometer oil reservoir around its outer periphery for absorbing conductive grease to form a continuous liquid metal bridge between the roller and the bi-directional cam.
9. A durability test apparatus for a permanent magnet stepper motor according to claim 7 wherein said bi-directional cam has a peak height corresponding to the maximum travel of the plunger such that under scram conditions said extension spring is compressed to a maximum stored energy condition and a resultant reaction torque greater than the rated torque of the driver.
10. The durability test device for a permanent magnet stepper motor of claim 9 wherein said bi-directional cam is made of high conductivity beryllium copper and is provided with conductive slip rings at both axial ends for guiding induced current on the shaft through conductive grease into the electrical measurement shield housing.

Description

Durable testing device for permanent magnet stepping motor Technical Field The invention relates to the technical field of motor testing, in particular to a durability testing device for a permanent magnet stepping motor. Background The permanent magnet stepping motor is widely applied to low-speed light-load scenes requiring precise angle control, such as air conditioner wind guide, intelligent locks, camera holders, small valves, instrument pointers and the like. The reliability and life characteristic detection, measurement and quantitative evaluation under the long-term operation condition are carried out on the motor, which is an important link for guaranteeing the application stability, the permanent magnet type stepping motor endurance test device belongs to electrical parameter measurement and performance test equipment and is used for monitoring and life evaluation on the operation state of the motor under the long-term circulation condition, the method is characterized in that test and measurement parameters such as moment, torque, load force and the like are acquired in real time through an electric measuring sensor (namely an electric sensor), and performance change and failure characteristics in the running process of the motor are monitored and data acquired on line by combining with actual working condition simulation, so that real and effective measurement data support is provided for motor life assessment and reliability verification. In the endurance test process of the permanent magnet stepping motor, in order to accurately acquire life and reliability measurement data of the motor at different running speeds, an electric measurement test needs to be carried out by simulating the actual running condition of the motor. The traditional endurance test device adopts a magnetic powder brake as a test load, mechanical energy output by a stepping motor cannot be effectively recovered, but is completely converted into heat energy through mutual friction and shearing among magnetic powder, and as the rotation speed is increased, slip power is increased in multiple under the same torque, the magnetic powder brake can generate intense heat at a high rotation speed, so that the resistance moment fluctuates (thermal attenuation) along with the temperature increase, test conditions are inconsistent, the stability and consistency of acquisition of electrical measurement parameters are directly influenced, measured data distortion is caused, and reliable basis cannot be provided for motor life evaluation. In the prior art, a servo motor is adopted as an active test load to replace a traditional passive brake, various complex moment curves can be simulated, electric energy can be fed back to a power grid through an energy feedback technology, the problem of thermal attenuation of the magnetic powder brake is effectively solved, the stability of an electric measurement test working condition is ensured, and the preliminary consistency of measurement data is improved. However, in the long-time endurance test of the stepper motor, high-frequency common mode current generated when the stepper motor driver and the servo driver run flows to the test sensor through the motor bearing, weak and continuous electric corrosion (EDM) can cause 'acid corrosion' -shaped pits to be generated in the bearing, the phenomenon belongs to an electric effect rather than mechanical abrasion, abnormal early failure of the tested motor can be caused, the abnormal early failure appears, the running noise is increased, the rotation resistance is abnormally increased, the positioning precision and the torque output are obviously deteriorated, the endurance test result deviates from the actual mechanical life of the motor, the authenticity of test data is seriously influenced, meanwhile, high-frequency electromagnetic noise can be coupled into a measurement signal of the torque sensor, so that pseudo-random fluctuation and false abnormality of a torque curve acquired by an upper computer can not truly reflect the mechanical property attenuation and life characteristics of the motor, finally, the conditions of misjudgment of the life of the motor, the reliability measurement data distortion, the failure of the test conclusion and the like are seriously influenced, and the electrical measurement accuracy and the data reliability of the endurance test result are seriously, and effective support can not be provided for the motor life evaluation and reliability verification. For this purpose, a endurance test apparatus for a permanent magnet stepper motor is proposed. Disclosure of Invention The invention aims to provide a durable testing device for a permanent magnet stepping motor, which solves the problems of thermal attenuation, electric corrosion and electromagnetic interference caused by the durable testing of the permanent magnet stepping motor in the prior art by means of cooperative matching of an electric measurement shielding sh