Steady-state no-load test method for mechanical characteristics of motor

Abstract

The invention discloses a steady-state no-load test method for mechanical characteristics of a motor. The method comprises the steps: S1, applying a rated voltage U01 to a motor, and measuring the no-load current I01 and the no-load rotating speed n01 of the motor when the motor operates to a steady state; S2, applying a voltage U02 to the motor, and when the motor operates to a steady state, measuring the no-load rotating speed n02 of the motor, wherein the voltage U02 is smaller than the rated voltage U01; S3, obtaining an expression that the current I, the rotating speed n, the output power P2 and the efficiency eta of the motor change along with the load torque T; and S4, obtaining the locked-rotor torque TD of the motor, selecting a plurality of values with the load torque T being 0-TD, and substituting into the expression of S3 to obtain a mechanical characteristic curve of the motor. The method has the advantages that the method can adapt to testing of more types of motors, the testing mode is simple, the testing cost is low, and compared with an acceleration torque transient mechanical characteristic testing method, the accuracy is better controlled, and the obtained characteristic curve is more accurate.

Description

technical field [0001] The invention relates to the technical field of motor design and application, in particular to a steady-state no-load test method for mechanical characteristics of a motor. Background technique [0002] The mechanical characteristics of the DC motor are used to represent the physical characteristics of the motor. Specifically, it is represented by the curve of the motor's speed, current, efficiency, input power, and output power as the motor torque changes. At present, the test of the mechanical characteristics of the DC motor is relatively mature, that is, while the motor is running, a variable load is added to the output end of the motor shaft, and the output torque of the motor and the corresponding current input by the motor are tested under different torques, so as to obtain The input power, output power and motor efficiency of the motor are obtained to form a set of data of the mechanical characteristic curve of the motor. [0003] The types and...

AI Technical Summary

Problems solved by technology

However, this test process is to perform transient acceleration on the motor, and its test accuracy is related to the capture accuracy of the transient capture point. Before the motor runs to a steady state, the curve of its rotational speed versus torque is a fluctuating curve. It is difficult to determine the capture accuracy of the transient capture point when it is running in a steady state, that is, the measurement accuracy of this method is also difficult to guarantee

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