A test method for dynamic pressure air bearing on-orbit friction torque

A technology of dynamic pressure air bearing and friction torque, which is applied in the field of inertial instrument parameter measurement, can solve the problems of low motor speed, inability to know the speed information of motor dynamic pressure air bearing, and inability to obtain counter electromotive force signal correctly, so as to reduce the cost of experiments, Simple process and strong versatility

Active Publication Date: 2019-12-20
BEIJING INST OF CONTROL ENG
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AI Technical Summary

Problems solved by technology

Although the back electromotive force zero-crossing detection method based on the three-phase winding of the motor is simple, the disadvantage is that the back electromotive force signal cannot be obtained correctly when the motor is at a low speed or at rest, and the speed information of the motor dynamic pressure air bearing cannot be obtained

Method used

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  • A test method for dynamic pressure air bearing on-orbit friction torque
  • A test method for dynamic pressure air bearing on-orbit friction torque
  • A test method for dynamic pressure air bearing on-orbit friction torque

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Embodiment

[0077] Concrete steps of the present invention are as follows:

[0078] (1) Establish the mathematical model M(ω)=α of the rotational speed ω of the dynamic pressure air bearing and the frictional moment M of the dynamic pressure air bearing n ω n +α n-1 ω n-1 +...+α 1 ω,n=1,2,...,10;

[0079] (2) According to the dynamic equation of the permanent magnet synchronous motor of the dynamic pressure air bearing and the mathematical model established in step (1), formulate the friction torque test experimental process and data collection method;

[0080] The dynamic equation of the permanent magnet synchronous motor with dynamic pressure air bearing is:

[0081]

[0082] The experimental process and data collection method of friction torque test are as follows:

[0083] The experimental process of friction torque test is: turn on the permanent magnet synchronous motor, wait for the permanent magnet synchronous motor to run for 5 minutes, turn off the permanent magnet synch...

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Abstract

The invention relates to a dynamic pressure gas bearing on-orbit friction torque test method and belongs to the field of inertia instrument parameter measurement. The dynamic pressure gas bearing on-orbit friction torque test method is applied to the control law design of a permanent magnet synchronous motor adopting a dynamic pressure gas bearing, and is a method for testing friction torque of the dynamic pressure gas bearing in the permanent magnet synchronous motor. The method comprises the following steps:1) establishing a dynamic pressure gas bearing friction torque hypothesis model; 2) setting a dynamic pressure gas bearing friction torque test experiment process and a data acquisition mode; 3) identifying the friction torque model according to the experiment process data; 4) determining the final friction torque model and parameters; and 5) carrying out reverse verification and comparison with the experiment test data through the determined friction torque model.

Description

technical field [0001] The invention relates to an on-orbit friction torque test method of a dynamic pressure air bearing, which belongs to the field of inertial instrument parameter measurement. Background technique [0002] The dynamic pressure air bearing refers to the bearing that forms a self-lubricating air film with passive gas. The air film generates a certain pressure in the bearing gap to support the load through the tangential relative motion of the bearing matching surface. Since the bearing rotates at high speed without mechanical Contact, thus achieving a long life in continuous operation, while also greatly reducing the noise level of the bearings. Based on the above two points, dynamic pressure air bearings tend to be used in permanent magnet synchronous motor bearings in mechanical gyroscopes with long life and low noise requirements. The motor in the mechanical gyro adopts a permanent magnet synchronous motor based on a dynamic pressure air bearing. In the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L5/00
CPCG01L5/0009
Inventor 李建朋马官营朱梦如李玉猛惠欣王冲岳文杰夏悦
Owner BEIJING INST OF CONTROL ENG
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