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What are the Types of Position Sensor for BLDC Motor?
The position sensor plays a role in determining the position of the rotor pole in the BLDC motor, and provides correct phase change information for the logic switch circuit. It converts the position signal of the rotor magnetic steel pole into an electrical signal, and then controls the stator winding phase change. There are many kinds of position sensors and each has its own characteristics. There are three kinds of position sensors commonly used in brushless dc motor, namely electromagnetic position sensor, magnetic sensitive position proximity sensor and photoelectric position sensor.
Electromagnetic position sensor
Brushless dc motor with electromagnetic position sensor is equipped with electromagnetic sensor components on stator assembly. When the rotor position of permanent magnet changes, electromagnetic effect will cause the electromagnetic sensor to produce high-frequency modulation signal (its amplitude varies with the rotor position). Common electromagnetic sensors such as coupling transformers, proximity switches and so on.
Magnetic-sensitive position sensor
Magnetic-sensitive position sensor is a semiconductor sensor whose electrical parameters vary with the surrounding magnetic field according to certain laws. A BLDC motor with a magnetic-sensitive position sensor is installed on a stator assembly to detect changes in the magnetic field generated by permanent magnets and rotors. The basic principles are hall effect and magnetoresistance effect. Common magnetic sensor hall components or hall integrated circuit, magnetic resistor and magnetic diode, etc.
Photoelectric position sensor
Photoelectric position sensor is made of photoelectric effect. It consists of a light shield that rotates with the rotor of the motor, a fixed light source and a photocell. BLDC motor with photoelectric position sensor is equipped with photoelectric sensor parts in a certain position on stator assembly. The rotor is equipped with a light shield and the light source is led or small bulb. When the rotor rotates, due to the role of the shader, the photosensitive components on the stator will generate pulse signals intermittently at a certain frequency.
Electromagnetic position sensor
Brushless dc motor with electromagnetic position sensor is equipped with electromagnetic sensor components on stator assembly. When the rotor position of permanent magnet changes, electromagnetic effect will cause the electromagnetic sensor to produce high-frequency modulation signal (its amplitude varies with the rotor position). Common electromagnetic sensors such as coupling transformers, proximity switches and so on.
Magnetic-sensitive position sensor
Magnetic-sensitive position sensor is a semiconductor sensor whose electrical parameters vary with the surrounding magnetic field according to certain laws. A BLDC motor with a magnetic-sensitive position sensor is installed on a stator assembly to detect changes in the magnetic field generated by permanent magnets and rotors. The basic principles are hall effect and magnetoresistance effect. Common magnetic sensor hall components or hall integrated circuit, magnetic resistor and magnetic diode, etc.
Photoelectric position sensor
Photoelectric position sensor is made of photoelectric effect. It consists of a light shield that rotates with the rotor of the motor, a fixed light source and a photocell. BLDC motor with photoelectric position sensor is equipped with photoelectric sensor parts in a certain position on stator assembly. The rotor is equipped with a light shield and the light source is led or small bulb. When the rotor rotates, due to the role of the shader, the photosensitive components on the stator will generate pulse signals intermittently at a certain frequency.
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