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Hall Position Sensor for Brushless DC motor
Hall position sensor is one of the three major parts of the BLDC motor system, and it is also the main symbol different from the brushed DC motors. Its function is to detect the position of the main rotor in the process of motion. The position signals of rotor magnet poles are converted into electrical signals to provide correct commutation information for logic switching circuits to control their turn-on and cut-off. With the change of rotor position, the current in the armature winding of the motor is reversed in order to form a step-by-step rotating magnetic field in the air gap, which drives the permanent magnet rotor to rotate continuously.
The Hall position sensor measures the position of the rotor, and the BLDC motor controller drives the motor continuously by receiving the position sensor signal to synchronize the inverter with the rotor. Although brushless DC motor can also detect the rotor position by the induction EMF generated by stator winding, and the position sensor is omitted, when the motor starts, the speed is too small, and the induction EMF signal is too small to detect.
The Hall sensor chip which can be used as position sensor of brushless DC motor can be divided into switch type and lock type. For electric bicycle motors, both Hall sensor chips can be used to accurately measure the position of rotor magnets. The performance of brushless DC motor made by these two Hall sensor chips, including the output power, efficiency and torque of the motor, has no difference, and can be compatible with the same motor controller. The application of position sensor reduces the noise of motor operation, improves the life and performance of motor, and achieves the effect of reducing energy consumption.
Crankshaft position sensor is also called engine speed and crankshaft angle sensor. Its function is to collect crankshaft rotation angle and engine speed signals, and input the electronic control unit (ECU) to determine the ignition time and injection time.
In order to distinguish the camshaft position sensor from the crankshaft position sensor (CPS), the camshaft position sensor is generally expressed by CIS. The function of the camshaft position sensor is to collect the position signal of the valve camshaft and input the ECU, so that the ECU can identify the top and bottom points of the cylinder compression, and then control sequential injection, ignition time and deflagration. In addition, the camshaft position signal is also used to identify the ignition time when the engine starts.
The Hall position sensor measures the position of the rotor, and the BLDC motor controller drives the motor continuously by receiving the position sensor signal to synchronize the inverter with the rotor. Although brushless DC motor can also detect the rotor position by the induction EMF generated by stator winding, and the position sensor is omitted, when the motor starts, the speed is too small, and the induction EMF signal is too small to detect.
The Hall sensor chip which can be used as position sensor of brushless DC motor can be divided into switch type and lock type. For electric bicycle motors, both Hall sensor chips can be used to accurately measure the position of rotor magnets. The performance of brushless DC motor made by these two Hall sensor chips, including the output power, efficiency and torque of the motor, has no difference, and can be compatible with the same motor controller. The application of position sensor reduces the noise of motor operation, improves the life and performance of motor, and achieves the effect of reducing energy consumption.
Crankshaft position sensor is also called engine speed and crankshaft angle sensor. Its function is to collect crankshaft rotation angle and engine speed signals, and input the electronic control unit (ECU) to determine the ignition time and injection time.
In order to distinguish the camshaft position sensor from the crankshaft position sensor (CPS), the camshaft position sensor is generally expressed by CIS. The function of the camshaft position sensor is to collect the position signal of the valve camshaft and input the ECU, so that the ECU can identify the top and bottom points of the cylinder compression, and then control sequential injection, ignition time and deflagration. In addition, the camshaft position signal is also used to identify the ignition time when the engine starts.
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