German SMERI sensors SMERI models SMERI prices

SMERI sensors are devices that convert mass signals into measurable electrical signal outputs. When using sensors, the actual working environment of the sensor should 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 system. There are qualitative differences between the old and new national standards in 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, column cylinder type, etc. Valve SMERI sensor classification

1) Contact sensors: The contacts of contact sensors act when two objects come into contact and squeeze each other. Common examples include limit switches and two-dimensional matrix position sensors. Limit switches have a simple structure, reliable operation, and low price. When an object moves and hits a limit switch, its internal contacts act 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 inside the mechanical palm 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 it to 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 on CNC machine tools is mainly for tool holder selection control, worktable travel control, and piston stroke control of oil and air cylinders.

SMERI sensor working principle

Crankshaft position sensors are usually installed at the front end of the crankshaft (at the pulley), at the rear end of the crankshaft 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 of each cylinder for ignition control and the top dead center signal of the first cylinder for sequential fuel injection control.

SMERI sensor industry applications

1) Brushless DC motor: The position sensor is one of the three main components of a brushless DC motor system and is the main feature distinguishing it from a brushed DC motor. 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 winding to commutate in sequence according to the change in rotor position, forming a stepwise rotating magnetic field in the air gap to drive the permanent magnet rotor to rotate continuously. Brushless DC motors require position sensors to measure the rotor position. The motor controller accepts position sensor signals to synchronize inverter commutation with the rotor to drive continuous motor operation. 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 electromotive force signal is too small to be detected. Hall effect sensor chips used as position sensors for brushless DC motors are divided into switching type and latching type. 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 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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