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Signal transmitting method of low-frequency acceleration sensor transmitter

A technology of acceleration sensing and signal transmission, applied in multi-dimensional acceleration measurement, acceleration measurement using inertial force, etc., can solve the problem of limited application, limited application environment, poor bending resistance, bundling resistance and low temperature resistance of coaxial cable And other issues

Inactive Publication Date: 2013-12-18
CHENGDU FORWARD TECH
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Problems solved by technology

[0002] In megawatt-class wind turbines, conventional piezoelectric accelerometers are usually used as vibration measuring devices. Piezoelectric accelerometers need to cooperate with charge amplifiers and signal conditioners to work, and the signal output by the signal conditioner is not very common. PLC is compatible with analog signals (such as 0~10V or 4~20mA), so it is necessary to further convert the signal and increase the system cost
Moreover, the piezoelectric acceleration sensor uses a coaxial cable as the signal transmission medium, and the coaxial cable has poor bending resistance, bundling resistance, and low temperature resistance, which limits its application environment.
In addition, this type of sensor is a voltage-type output. When the cable is long, the signal will attenuate, which will affect the measurement accuracy, and it is easy to be interfered by the harsh electromagnetic environment in the fan, resulting in a decrease in accuracy or even damage.
At the same time, the piezoelectric acceleration sensor is not sensitive to ultra-low frequency vibration (0.1Hz and below), which limits its application in wind turbine structural vibration monitoring

Method used

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  • Signal transmitting method of low-frequency acceleration sensor transmitter

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Embodiment Construction

[0011] In order to describe the technical content, structural features, goals and effects of the present invention in detail, the following examples are given and described in detail with accompanying drawings.

[0012] see figure 1 , a low-frequency acceleration sensor transmitter of the present invention is installed on the monitored vibration equipment of the wind power generating set, and is electrically connected to the PLC to transmit signals. It includes a MEMS biaxial acceleration sensor, two signal conditioning modules, two Current loop transmission module, two current loop output interfaces.

[0013] see more figure 1 , one of the signal conditioning modules is set between a signal output terminal (X signal output terminal) of the MEMS biaxial acceleration sensor and the signal input terminal of one of the current loop transmission modules and is connected to the MEMS biaxial acceleration sensor and a current loop respectively The transmission module implements ele...

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Abstract

The invention discloses a signal transmitting method of a low-frequency acceleration sensor transmitter. Due to the fact that an MEMS dual-shaft acceleration sensor replaces a traditional piezoelectric acceleration sensor to serve as a vibration measuring part of a wind generating set and outputs an analog signal capable of being received by a PLC through current loop transmitting modules, the number of corresponding components can be effectively reduced, and due to the fact that the analogue signal is output to the PLC in a current simulating mode, electromagnetic interference can be effectively avoided.

Description

technical field [0001] The invention relates to a sensor transmitter, in particular to a signal transmission method of a low-frequency acceleration sensor transmitter. Background technique [0002] In megawatt-class wind turbines, conventional piezoelectric accelerometers are usually used as vibration measuring devices. Piezoelectric accelerometers need to cooperate with charge amplifiers and signal conditioners to work, and the signal output by the signal conditioner is not very common. PLC is compatible with analog signals (such as 0~10V or 4~20mA), so it is necessary to further convert the signal and increase the system cost. Moreover, the piezoelectric acceleration sensor uses a coaxial cable as the signal transmission medium, and the coaxial cable has poor bending resistance, bundling resistance, and low temperature resistance, which limits its application environment. In addition, this type of sensor has a voltage output. When the cable is long, the signal will atte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P15/18
Inventor 李泳林
Owner CHENGDU FORWARD TECH
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