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Method for testing rotational inertia of motor rotor

A technology of moment of inertia and motor rotor, which is applied in the testing of machines/structural components, static/dynamic balance testing, measuring devices, etc., can solve problems such as the inability to accurately detect the moment of inertia of motor rotors, and achieve a simple and easy test method, Improved consistency, high-accuracy results

Inactive Publication Date: 2017-12-29
RES INST OF ZHEJIANG UNIV TAIZHOU +1
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problem that the moment of inertia of the motor rotor cannot be accurately detected at present

Method used

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  • Method for testing rotational inertia of motor rotor
  • Method for testing rotational inertia of motor rotor
  • Method for testing rotational inertia of motor rotor

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] The mechanical characteristic equation of the motor is:

[0020] (1)

[0021] In formula (1), T Indicates the output torque of the motor, J Indicates the moment of inertia of the motor rotor, ω represents the angular velocity, T 0 represents the load moment, dω / dt Indicates the angular acceleration, and D indicates the friction coefficient of the motor rotor.

[0022] Considering special circumstances, when the motor stops in a free state, the motor has no torque output, namely T is 0, the load moment T 0 is also 0, the mechanical characteristic equation at this time is:

[0023] (2)

[0024] If the motor rotor is increased by a figure 1 Standard flywheel shown, moment of inertia of standard flywheel J 0 Calculate according to the formula:

[0025] (3)

[0026] In formula (3), m represents the quality of the st...

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Abstract

The invention discloses a method for testing the rotational inertia of a motor rotor, and the method comprises the following steps: (1), enabling the motor rotor to be unloaded, detecting the rotating speed of a motor in real time, automatically cutting off the power supply of the motor after the motor accelerates to a rated rotating speed, and automatically recording the angular speed curve omega of the motor in a deceleration process through a sampling system; (2), enabling the motor to work after the motor is loaded with a standard flywheel with the rotational inertia J0, detecting the rotating speed of the motor in real time, automatically cutting off the power supply of the motor after the motor accelerates to the rated rotating speed, and automatically recording the angular speed curve omega' of the motor in the deceleration process through the sampling system; (3), selecting a point A from the angular speed curve omega, selecting a point B from the angular speed curve omega' and respectively calculating the angular acceleration alpha1 of the point A and the angular acceleration alpha2 of the point B, wherein the point A and the point B have the same or approximate angular speeds; (4), calculating the rotational inertia (shown in the description) of the motor rotor through alpha1, alph2 and J0.

Description

technical field [0001] The invention relates to a testing method for the moment of inertia of a motor rotor. Background technique [0002] The moment of inertia of the motor rotor is an important parameter of the motor body mechanism, which is related to the material and structure of the rotor itself and the installation method between the rotor and the bearing. [0003] Due to the processing and installation deviations in the manufacturing process of the motor, the final mass-produced motor rotor has a deviation in the moment of inertia, resulting in a difference between the performance of the motor and the theoretical design value. At present, there is no effective method to accurately detect the moment of inertia of the motor rotor after the motor is manufactured, and it is urgent to develop an online test method for the moment of inertia of the motor rotor. Contents of the invention [0004] The purpose of the invention is to solve the current technical problem that t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M1/10
CPCG01M1/10
Inventor 周卫华
Owner RES INST OF ZHEJIANG UNIV TAIZHOU
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