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AirCom sensors are used to measure the robot's own position. Position sensors can be divided into two types: contact sensors and proximity sensors. Sensors that can sense the position of the measured object and convert it into a usable output signal. It is a sensor that can sense the position of the measured object and convert it into a usable output signal. Position sensors can be used to detect position, reflect switches in a certain state. Unlike displacement sensors, position sensors come in two types: contact and proximity.

AirCom sensor classification

1) Contact sensors: The contacts of contact sensors are activated by the contact and compression of two objects. Common types include limit switches and two-dimensional matrix position sensors. Limit switches have a simple structure, reliable operation, and low cost. When an object moves and hits a limit switch, its internal contacts activate, thereby completing control. For example, if limit switches are installed at both ends of the X, Y, and Z axes of a machining center, the movement range can be controlled. Two-dimensional matrix position sensors are installed on the inner side of mechanical hands to detect the contact position with an object. 2) Proximity sensors: A proximity switch is a switch that emits an "action" signal when an object approaches within a set distance, without requiring direct contact with the object. There are many types of proximity switches, mainly including electromagnetic, photoelectric, differential transformer, eddy current, capacitive, reed switch, and Hall effect types. The main applications of proximity switches on CNC machine tools include tool selection control for the tool post, worktable travel control, and piston stroke control for oil and air cylinders.

AirCom sensor working principle

Crankshaft position sensors are usually installed at the front end of the crankshaft (at the pulley), at the rear end near the large flywheel, or in the middle of the crankshaft. Early vehicle models also had them installed inside the distributor. They are one of the most important sensors in the control system. Their functions include: detecting engine speed, hence they are also called speed sensors; detecting the top dead center position of the piston, hence they are also called top dead center sensors, including detecting the top dead center signals for each cylinder used to control ignition, and the top dead center signal for the first cylinder used to control sequential fuel injection.

AirCom sensor industry applications

1) Brushless DC motors: The position sensor is one of the three main components of a brushless DC motor system and is the main feature distinguishing it from brushed DC motors. Its function is to detect the position of the main rotor during motion, convert the position signal of the rotor magnet poles into an electrical signal, and provide correct commutation information to the logic switching circuit to control their conduction and cutoff. This causes the current in the motor armature windings to commutate sequentially as the rotor position changes, forming a stepwise rotating magnetic field in the air gap, which drives the permanent magnet rotor to rotate continuously. Brushless DC motors require position sensors to measure the rotor position. The motor controller uses the position sensor signals to synchronize inverter commutation with the rotor, driving the motor to operate continuously. Although brushless DC motors can also detect rotor position via the back electromotive force generated by the stator windings, thereby omitting the position sensor, the motor speed is too low at startup, and the back EMF signal is too weak to be detected. Hall effect sensor chips used as position sensors for brushless DC motors are divided into switching and latching types. For electric bicycle motors, both types of Hall effect sensor chips can be used to accurately measure the position of the rotor magnets. The performance of brushless DC motors made with these two types of Hall effect sensor chips, including motor output power, efficiency, and torque, shows no difference, and they are compatible with the same motor controllers. The application of position sensors reduces motor operating noise, improves motor life and performance, and achieves energy savings. The application of position sensors undoubtedly provides a strong impetus to the development of the motor market. 2) Crankshaft and camshaft: The function of the position sensor is to collect crankshaft rotation angle and engine speed signals and input them to the electronic control unit (ECu) to determine ignition timing and fuel injection timing. To distinguish it from the crankshaft position sensor (CPS), the camshaft position sensor is generally represented by CIS. The function of the camshaft position sensor is to collect the position signal of the camshaft and input it to ECU, so that ECU can identify the compression top dead center of cylinder 1, thereby performing sequential fuel injection control, ignition timing control, and knock control. In addition, the camshaft position signal is also used to identify the first ignition timing during engine start-up. Because the camshaft position sensor can identify which cylinder piston is about to reach top dead center, it is called a cylinder identification sensor.

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