German VALENTI SRL sensors, VALENTI SRL models, VALENTI SRL prices

VALENTI SRL sensors precisely measure the actual displacement of the detected product by detecting the absolute position of a movable magnetic ring using internal non-contact measurement and control technology; the high precision and high reliability of these sensors have been widely applied in thousands of real-world cases. Since the movable magnetic ring used for position determination does not come into direct contact with the sensitive element, the sensors can be used in extremely harsh industrial environments and are not easily affected by oil stains, solutions, dust, or other contaminants. In addition, the sensors use high-tech materials and advanced electronic processing technology, enabling them to operate in high-temperature, high-pressure, and high-vibration environments. The sensor output signal is an absolute displacement value; even if power is interrupted and reconnected, data is not lost, and there is no need to re-zero. Because the sensitive element is non-contact, repeated detection causes no wear to the sensor, significantly improving detection reliability and service life.

VALENTI SRL sensor classification

1) Contact sensors: Contact sensor actuators are triggered by the contact and compression of two objects. Common types include limit switches and two-dimensional matrix position sensors. Limit switches feature simple structure, reliable operation, and low cost. When an object encounters a limit switch during motion, 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 travel range can be controlled. Two-dimensional matrix position sensors are installed inside mechanical grippers to detect the contact position relative to 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. There are many types of proximity switches, mainly electromagnetic, photoelectric, differential transformer, eddy current, capacitive, reed switch, and Hall effect. Applications of proximity switches on CNC machine tools mainly include tool turret selection control, worktable travel control, and piston stroke control for hydraulic and pneumatic cylinders.

VALENTI SRL sensor working principle

The crankshaft position sensor is 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 earlier vehicle models, it was also installed inside the distributor. It is one of the most important sensors in the control system. Its functions include: detecting engine speed, hence it is also called a speed sensor; detecting the top dead center position of the piston, hence it is also called a top dead center sensor. This includes 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.

VALENTI SRL 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 primary 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 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 generated in the stator windings, thereby eliminating the need for position sensors, 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 e-bike 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 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 as CIS. The function of the camshaft position sensor is to collect the position signal of the camshaft and input it to ECU, allowing ECU to 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 TDC, it is called the cylinder identification sensor.

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