German MCS FACCHETTI sensors, MCS FACCHETTI models, MCS FACCHETTI prices

MCS FACCHETTI sensors are devices that convert optical signals into electrical signals. Their operating principle is based on the photoelectric effect. The photoelectric effect refers to the phenomenon where electrons in a material absorb photon energy when light strikes certain substances, resulting in corresponding electrical effects. Based on the different manifestations of the photoelectric effect, it is categorized into three types: external photoelectric effect, internal photoelectric effect, and photovoltaic effect. Photoelectric devices include phototubes, photomultiplier tubes, photoresistors, photodiodes, phototransistors, and photocells. The performance and characteristic curves of these photoelectric devices are analyzed.

MCS FACCHETTI sensor classification

1) Contact sensors: The contacts of contact sensors are activated by the contact and compression between two objects. Common examples include limit switches and two-dimensional matrix position sensors. Limit switches feature simple structure, reliable operation, and low cost. When a moving object encounters a limit switch, 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 travel range can be controlled. Two-dimensional matrix position sensors are installed inside 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. 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 selection control for the tool turret, worktable travel control, and piston stroke control for hydraulic and pneumatic cylinders.

MCS FACCHETTI 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; 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 for ignition control, and the TDC signal for the first cylinder used for sequential fuel injection control.

MCS FACCHETTI 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 primary 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 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 according to 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 uses the position sensor signals to synchronize inverter commutation with the rotor, driving continuous motor operation. Although brushless DC motors can detect rotor position via the back electromotive force (back-EMF) generated in the stator windings, thereby eliminating the need for position sensors, the rotational speed is too low at startup, making the back-EMF signal too weak to detect. 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 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 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 into 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 as CIS. The function of the camshaft position sensor is to collect the position signal of the camshaft controlling valve timing and input it to ECU, allowing ECU to identify the compression top dead center of cylinder 1, thereby enabling sequential fuel injection control, ignition timing control, and knock control. Additionally, 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 approaching top dead center, it is also called the cylinder identification sensor.

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