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Method for determining accuracy of angle measurement signal emitted by rotary transformer

A resolver and angle measurement technology, which is applied to the program control of measuring devices, instruments, sequence/logic controllers, etc., can solve problems such as 21-bit angle value distortion, speed stall failure, and 16-bit precision machine data distortion. To achieve the effect of ensuring stability, ensuring accuracy and reliability, and ensuring safe operation

Active Publication Date: 2012-12-12
BEIJING INST OF CONTROL ENG
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Problems solved by technology

Figure 4 In the process, because the actual speed has exceeded the speed measurement range set by the external resistance and capacitance of the precision machine demodulation chip, the 16-bit precision machine data is seriously distorted, which in turn leads to serious distortion of the coupled 21-bit angle value used for closed-loop control, causing the speed stall failure

Method used

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  • Method for determining accuracy of angle measurement signal emitted by rotary transformer
  • Method for determining accuracy of angle measurement signal emitted by rotary transformer
  • Method for determining accuracy of angle measurement signal emitted by rotary transformer

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Embodiment Construction

[0025] Motor closed-loop control system such as figure 1 As shown, a digital signal processor DSP is responsible for running the closed-loop control algorithm of the motor and the method for judging the accuracy of the angle signal designed by the present invention.

[0026] In chronological order, the specific implementation steps are:

[0027] (1) In order to obtain the angle data required for closed-loop control, the DSP sends an angle acquisition start signal to the FPGA;

[0028] (2) After the FPGA receives the start signal, according to the designed control logic of the demodulation chip, it sends control logic signals to the rough and fine machine demodulation chips respectively;

[0029] (3) The rough and fine machine demodulation chips start their respective angle information acquisition and conversion processes according to the control logic signals sent by the FPGA, and output the 16-bit angle data obtained from each to the bus, and the FPGA reads these two data i...

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Abstract

The invention provides a method for determining accuracy of an angle measurement signal emitted by a rotary transformer. The method comprises the following steps: determining whether data output by an angle measurement unit of the rotary transformer is abnormal based on three determination criteria by using angle measurement data respectively acquired by a coarse machine and a fine machine of the rotary transformer; and determining whether a system enters into a normal operating mode or a safe mode under controlling of a motor according to determination results. The method provided by the invention has been applied in controlling of a low speed framework of a control moment gyro and can ensure safety of framework control and satellite attitudes.

Description

technical field [0001] The invention relates to a method for judging the accuracy of a rotary transformer angle measurement signal, which is suitable for the safety control of a high-precision motor control system. Background technique [0002] In the field of aerospace, the speed control performance of the low-speed frame in the control moment gyroscope has an important impact on the working performance of the whole machine, and plays an important role in the attitude stability and attitude control accuracy of the satellite. [0003] At present, the high-precision motor control system in aerospace products generally uses the resolver angle measurement unit to obtain the measured angle value, and sends the angle measurement value as a feedback value to the motor closed-loop control system. The accuracy of the angle measurement will directly affect the stability and reliability of the closed-loop control system. [0004] The coarse and fine machines of the resolver generate ...

Claims

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Application Information

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IPC IPC(8): G01C25/00G01B21/22G05B19/04
Inventor 周大宁翟百臣张激扬赵雷
Owner BEIJING INST OF CONTROL ENG
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