German COMES SA sensors, COMES SA models, COMES SA prices

COMES SA sensors are devices that convert mass signals into measurable electrical signal outputs. When using sensors, the actual working environment of the sensor must be considered first; this is crucial for the correct selection of load cells, as it affects whether the sensor can operate normally, its safety and service life, and even the reliability and safety of the entire weighing instrument. There are qualitative differences between the old and new national standards regarding the basic concepts and evaluation methods of the main technical indicators of load cells. The main types include S type, cantilever type, spoke type, plate ring type, membrane box type, bridge type, and column cylinder type. Valve COMES SA sensor classification

1) Contact sensors: The contacts of contact sensors are actuated by the contact and compression of two objects. Common examples 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 touches a limit switch, its internal contacts actuate to complete 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 grippers to detect the contact position with an object. 2) Proximity sensors: A proximity switch is a switch that emits an "actuation" 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 application of proximity switches in CNC machine tools mainly includes tool turret selection control, worktable travel control, and piston stroke control for oil and air cylinders.

COMES SA 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; and detecting the top dead center (TDC) position of the piston, hence they are also called TDC sensors. This includes detecting the TDC signals for each cylinder used to control ignition, and the TDC signal for the first cylinder used to control sequential fuel injection.

COMES SA sensor industry applications

1) Brushless DC motors: Position sensors are one of the three main components of a brushless DC motor system and are the main feature distinguishing them from brushed DC motors. Their function is to detect the position of the main rotor during motion, convert the position signal of the rotor magnet poles into electrical signals, and provide correct commutation information to the logic switching circuit. This controls their conduction and cutoff, causing the current in the motor armature windings to commutate sequentially with changes in rotor position, forming a stepwise rotating magnetic field in the air gap that drives the permanent magnet rotor to rotate continuously. Brushless DC motors require position sensors to measure rotor position; the motor controller accepts position sensor signals to synchronize inverter commutation with the rotor, driving continuous motor operation. Although brushless DC motors can detect rotor position via back electromotive force (back-EMF) generated in the stator windings, thereby eliminating the need for position sensors, the motor speed is too low at startup, resulting in back-EMF signals that are too weak to detect. 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 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 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 denoted 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 TDC of cylinder 1, thereby enabling sequential fuel injection control, ignition timing control, and knock control. In addition, the camshaft position signal is used to identify the first ignition timing during engine start-up. Because the camshaft position sensor can identify which cylinder's piston is about to reach top dead center, it is called the cylinder identification sensor.

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