The sensor is the main link to realize automatic detection and automatic control. It plays a key position in the rotor dynamic balance maneuver balance measurement system. It can convert the measured data into electrical signals or other forms of data output according to the information characteristics. The principle of measuring the vibration signal can be expressed in three processes. The first process is to receive the vibration signal, the second process is to convert the vibration signal into an electrical signal, and the third process is to convert the electrical signal into a subsequent instrument that can be processed. Voltage signal.

In practice, there are many types of sensors, such as pressure sensors, infrared sensors, displacement sensors, photoelectric sensors, etc. The following mainly introduces several kinds of vibration sensors used in the rotor dynamic balance motor balance measurement system.

Speed ​​sensor

A speed sensor is a sensor that converts the speed at which an object vibrates into a power output. It is a non-contact detection device that can be fabricated mechanically, electrically, magnetically, optically, and hybridly. The universal speed sensor is divided into magnetoelectric induction type, photoelectric effect type, Hall effect type and the like. The advantage is that it is easy to install, does not need external power supply, and has good IF range characteristics, and is more suitable for medium-speed rotors; its disadvantage is that the application characteristics will decrease for a period of time, and there will be a certain phase difference in low-frequency prediction.

2. Acceleration sensor
An acceleration sensor is an electronic device that can detect acceleration forces. In physics, when an object is subjected to a force, it causes an acceleration, such as gravity. The acceleration force can be a constant, such as g, which can be a variable. Accelerometers are designed according to this principle. Commonly used are magnetoelectric acceleration sensors, piezoelectric acceleration sensors, and fiber acceleration sensors. In the unbalance detection, the piezoelectric acceleration sensor is more common, which has the advantages of good reliability and convenient installation, and is more suitable for detecting high-frequency vibration; the disadvantage is that low-frequency vibration cannot be detected, and an external DC power supply is required for measurement.

3. Speed ​​sensor
The speed sensor is a sensor that converts the rotational speed of a rotating object into a power output. It accurately detects the instantaneous speed of various motors used in automatic control systems and automated meters. Commonly used rotational speed sensors are divided into magnetoelectric induction type, photoelectric effect type, magnetoresistance effect type, and capacitive type. The phase of the unbalanced amount is based on the rotational speed signal, and the periodic pulse signal of the rotational speed detection is also provided by the rotational speed signal.

4. Displacement sensor
Displacement sensors are also called linear sensors. In general, there are inductive displacement sensors, capacitive displacement sensors, photoelectric displacement sensors, ultrasonic displacement sensors and Hall-type displacement sensors. The displacement sensor works by converting the physical displacement caused by the object to be measured into a relative electrical signal. The displacement sensor is mainly used for intelligent control of the analog quantity in the automated equipment production line. The advantage is that the signal-to-noise ratio of the detection signal is high, and the detection frequency range is wide, the vibration position can be directly detected, and it is easy to calibrate; the disadvantage is that it is inconvenient to install, and an external DC power source is needed for application.