German legrand sensor legrand model legrand price

legrand sensors are measurement feedback devices that operate based on the optical principle of gratings. Grating scales are frequently used in the closed-loop servo systems of CNC machine tools and can be used to detect linear or angular displacement. The measurement output signal is a digital pulse, characterized by a large detection range, high detection accuracy, and fast response speed. For example, in CNC machine tools, they are often used to detect the coordinates of the tool and workpiece to observe and track tool path errors, thereby compensating for the motion errors of the tool. According to different manufacturing methods and optical principles, grating scales are divided into transmissive gratings and reflective gratings.

legrand 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 comes into contact with a limit switch during motion, its internal contacts activate 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 "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 in CNC machine tools include tool selection control for the tool turret, worktable travel control, and piston stroke control for hydraulic and pneumatic cylinders.

legrand sensor working principle

Crankshaft position sensors are typically 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. In early vehicle models, they were also 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 (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.

legrand 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 as the rotor position changes, 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 the rotor position. The motor controller uses the position sensor signals to synchronize inverter commutation with the rotor, driving continuous motor operation. Although brushless DC motors can also detect rotor position via the back electromotive force (back-EMF) generated by the stator windings, thereby eliminating the need for position sensors, the back-EMF signal is too weak to be detected during motor startup due to the low rotational speed. 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 performing 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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