Vibration sensor works
The vibration sensor is one of the key components in the motor condition monitoring. Its function is to convert the mechanical vibration quantity into a proportional quantity of electricity. Since it is actually an electromechanical energy conversion device, it is called a transducer, a vibration pickup, and the like.
The vibration sensor does not directly convert the original mechanical quantity into electricity, but instead regards the original mechanical quantity as the input quantity of the vibration sensor, which is then received by the mechanical receiving part to form another mechanical quantity suitable for transformation, and finally transformed into an electromechanical conversion part. Electricity. Therefore, the performance of the sensor is determined by the mechanical reception and electromechanical conversion.
Vibration sensor classification
According to the measurement method and the physical properties of the measurement process, the vibration sensor is divided into three types: mechanical, optical and electrical measurements.
● Mechanical: The engineering vibration parameters are converted into mechanical signals, which are measured and recorded after being amplified by the mechanical system. The commonly used instruments include a lever-type vibrometer and a Geiger vibrometer, which have lower measurable frequencies and poorer accuracy, but are simpler and more convenient for field testing.
● Optical: The engineering vibration parameters are converted into optical signals, displayed and recorded by the optical system after amplification.
● Electrometric: converts the engineering vibration parameters into electrical signals, which are displayed and recorded after being amplified by electronic circuits.
Vibration sensor application
The most widely used vibration sensor in motor manufacturing and testing is the motor vibration tester, which is used by almost every motor manufacturer.
The motor vibration parameters in the precision industrial production process reflect the unbalance of the machine equipment, electrical defects, loose fasteners, and other abnormal phenomena. Vibration problems caused by the vibration caused the accuracy to decline and bring potential safety hazards.
For large-sized equipment supporting motors, customers often have vibration sensors. General sensors and controllers are used in conjunction with each other. By setting the parameter limit value, the motor power supply will be forcibly cut off in an abnormal state to protect the motor and equipment.