Permanent magnetic motor gullet torque measuring method

Abstract

The invention belongs to the motor torque measuring technology and more particularly, to a permanent magnetic motor gullet torque measuring method, characterized by: a tested motor is in tangent contact with the guide rail plane through a circular housing and under the assistance of a baffle plate, positions at the position of the guide rail; when the guide rail moves, the tested motor rolls and through a precise moving platform, the moving length of the tested motor is determined; the motor shaft at the geometrical center of the circular housing ensures that the initial angle is possible at any measuring point through a horizontal balanced rod. The balanced rod is ensured to be at a horizontal state at any measuring point through the horizontal ruler, the counterweight, the screw rod support rod and the electronic scale. According to the lever balance principle and through the torque equilibrium equation, it is possible to accurately work out the gullet torque at any measuring point. Through the gradual movement and the measurement along the guide rail, the discrete waveform for the motor gullet torque could be obtained.

Description

technical field [0001] The invention belongs to the motor torque testing technology, in particular to the measurement of the cogging torque of a permanent magnet motor. Background technique [0002] Due to factors such as cogging structure and pole slot fit, the permeance distribution in the entire circumference of the motor will always be uneven. In a permanent magnet motor, however, the permanent magnet poles always tend to be positioned at the minimum permeance position. Therefore, the cogging torque based on the permanent magnet pole positioning effect is an inherent phenomenon of permanent magnet motors. Compared with the rated torque, the magnitude of the cogging torque is usually small, but its fluctuation frequency is usually high. When the motor is running, the high-frequency fluctuating cogging torque causes the increase of vibration and noise, the fluctuation of instantaneous torque and speed, etc., which is not conducive to the improvement of the performance of...

AI Technical Summary

Problems solved by technology

Although the cogging torque measurement based on the rotation method can make the operation process more convenient, its shortcomings are also very prominent, as follows: First, considering the high-frequency characteristics of the cogging torque, this type of measurement method has a great impact on the accuracy and accuracy of the angle sensor. The resolution requirement is high; second, when adopting the step-by-step rotation method, this type of measurement method requires high positioning accuracy and positioning stability of the rotary drive; thirdly, when the continuous rotation method is adopted, the response of this type of measurement method to the torque sensor High performance requirements and measurement errors due to viscosity, friction, etc.

Secondly, the devices or mechanisms used to measure cogging torque in the reported methods are nothing more than traditional instruments such as conventional torque sensors, simple levers, spring tension gauges, suspension weights, and torque wrenches.

Traditional instruments make it easy to build a measurement system, but when used to measure cogging torque with small amplitude and high frequency, the accuracy and accuracy of the measurement results are difficult to guarantee

The response performance of conventional torque sensors is insufficient, and it is difficult to balance the range and accuracy; the simple lever lacks a closed-loop design for balance state monitoring and adjustment, and the accuracy of measurement results cannot be guaranteed; spring tension gauges, suspension weights and torque wrenches, etc. , these devices that balance the cogging torque by applying the active torque to achieve the measurement purpose can only measure the cogging torque of the stable balance segment, but cannot measure the cogging torque of the unstable balance segment

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