German SCHMERSAL sensors, SCHMERSAL models, SCHMERSAL prices

SCHMERSAL sensors, also known as torque sensors, torsion sensors, torque transducers, or torque meters, are divided into two main categories: dynamic and static. Dynamic torque sensors are also referred to as torque sensors, torque-speed sensors, non-contact torque sensors, or rotary torque sensors. Torque sensors detect the twisting moment on various rotating or non-rotating mechanical components. They convert the physical changes in torque into precise electrical signals. Torque sensors can be used in the manufacture of viscometers and electric (pneumatic, hydraulic) torque wrenches. They offer advantages such as high precision, fast frequency response, good reliability, and long service life.

SCHMERSAL sensor classification

1) Laser speed measurement: With the rise of modern precision manufacturing and the need for cost savings, non-contact speed sensors are gradually replacing contact speed sensors. Currently, the most accurate and commonly used non-contact laser speed sensor on the market is the ZLS-Px aberration speed sensor. The aberration speed sensor has two ports: one emission port that emits a LED light source, and one high-speed imaging port that achieves CCD area high-speed imaging comparison. By comparing images at two points in time within an extremely short period, it determines the distance the object has moved. Combined with internal algorithms, it outputs the object's speed in real time. As shown in the figure, (1) is the LED light emission port, (2) is the camera reception port, (3) and (4) are the terminal blocks, and (5) are the mounting screw holes. The (1) LED light emission port directs laser light at the target object; after reflection, the signal is received by the (2) camera reception port and sent to the signal processor, which calculates the speed using algorithms. The ZLS-Px aberration speed sensor can simultaneously measure speed and length in two directions. It not only detects whether the object has stopped but also identifies its direction of motion. Mount the sensor on a stable bracket to ensure that excessive vibration does not occur during the rotation of the object, allowing accurate measurement of the rotation angle and speed of the rotating object. 2) Radar speed measurement: Traditional speed measurement mostly involves rotational and linear motion speed measurement. However, in industrial automation, there are many irregular speed measurement scenarios, such as athlete speed measurement, traffic vehicle speed measurement, and golf ball speed measurement. Radar speed sensors can meet these requirements.

SCHMERSAL sensor principle

A transmissive speed sensor consists of a slotted or notched disk, a light source, and a phototube. When the disk rotates with the measured shaft, light passes through the holes or notches to illuminate the phototube. When illuminated, the phototube's reverse resistance drops significantly, outputting an electrical pulse signal. When the disk blocks the light source, the phototube's reverse resistance becomes very high, and no signal is output. Thus, based on the number of holes or notches on the disk, the rotational speed of the measured shaft can be determined. The usual number of disk holes or notches is unclear in the source, so when the measured shaft completes one revolution, the photoelectric converter outputs 60 pulse signals. If the time base signal of the electronic counter is set to 1s, the rotational speed of the measured shaft can be read directly. The principle of reflective speed sensors is similar to that of transmissive sensors; they convert changes in sensed light into electrical signals via a phototube. However, they obtain pulse signals through light reflection, typically by attaching reflective material to the measurement area of the measured shaft to create a reflective surface. Common reflective materials include specialized speed-measuring reflective tape; aluminum foil or other reflective materials can also be used. Sometimes, white paint is applied to the measurement area to serve as a reflective surface. The projector and reflective surface must be properly configured, typically with a distance of 5-15M between them. When the measured shaft rotates, the photoelectric element receives pulsating light and outputs corresponding electrical signals to the electronic counter, thereby measuring the shaft's rotational speed. The output signal waveform of photoelectric speed sensors is relatively regular, close to a standard square wave, with almost no interference signals. However, vibration can reduce the lifespan of the light source in transmissive sensors, making them unsuitable for environments with strong vibrations. Reflective sensors have no mechanical connection with the measured shaft and are convenient to use.

SCHMERSAL sensor industry applications

1) Modern vehicles are generally equipped with engine control, autonomous driving, ABS, TRC, automatic door locking, active suspension, guidance systems, electronic instruments, and other devices, all of which require vehicle speed signals. Therefore, the accuracy and stability of the output signals from speed sensors will greatly impact these control units. Automotive speed sensors often adopt a Hall-effect structure. Hall speed sensors are magnetoelectric sensors based on the Hall effect, featuring high magnetic field sensitivity, stable output signals, high frequency response, strong anti-electromagnetic interference capability, simple structure, and ease of use. They mainly consist of permanent magnets with a specific number of pole pairs (generally 4 or 8 pairs), Hall elements, rotating mechanisms, and input/output connectors. Their working principle is that when the sensor's rotating mechanism is driven externally, it rotates the permanent magnet, causing periodic changes in the magnetic field passing through the Hall element. This induces voltage changes in the Hall element, which are processed by subsequent circuits to form stable pulse voltage signals as the output of the speed sensor. Key electrical technical parameters for Hall-structure speed sensors include high/low output voltage levels, duty cycle, period, rise time, fall time, and pulses per cycle. To ensure product performance and reliability, these parameters must be quantitatively tested before factory shipment. Test systems featuring integration and intelligence, efficient automatic measurement, software calculation, and graphical or tabular display of results are increasingly favored by automotive speed sensor manufacturers. A comprehensive testing device has been developed for performance measurement of common Hall-effect vehicle speed sensors. Considering cost, the high-speed counter port of a microprocessor is used for data acquisition from the vehicle speed sensor, while software control handles data calculation and graphical display processing. The completed testing device offers advantages such as high test accuracy, reliable data communication, a user-friendly graphical interface, strong anti-interference capability, simple and intuitive testing processes, and low system development costs. It has good market potential, indicating significant application prospects for speed sensors in vehicle speed detection. 2) Speed sensors for belt conveyors use Hall sensors, which utilize the Hall effect for magnetoelectric conversion. Since the discovery of the Hall effect in 1879, it has undergone more than 100 years of development. However, its application gained attention and widespread adoption only in the 50s of this century, due to the rapid development of microelectronics, leading to the continuous development of various Hall elements. China began increasing research on Hall elements in the 20s of the 70 century. After nearly several decades of research and development, it is now possible to produce Hall elements with various performances, such as standard type, high-sensitivity type, low-temperature-coefficient type, temperature/magnetic-field sensing type, and switch-type Hall elements. Due to their characteristics of high sensitivity, good linearity, high stability, small size, and high-temperature resistance, Hall sensors are widely used in non-electrical quantity measurement, automatic control, computer devices, and modern military technology across various industrial fields.

Weidou Intelligent Technology specializes in selling German SCHMERSAL sensors, SCHMERSAL proximity sensors, SCHMERSAL distance sensors, SCHMERSAL vision sensors, SCHMERSAL displacement sensors, SCHMERSAL torque sensors, SCHMERSAL speed sensors, SCHMERSAL photoelectric sensors, SCHMERSAL position sensors, SCHMERSAL angle sensors, SCHMERSAL tactile sensors, SCHMERSAL temperature sensors, SCHMERSAL pressure sensors, SCHMERSAL flow sensors, SCHMERSAL level sensors, SCHMERSAL motion sensors, and SCHMERSAL process sensors. All products are original imports from Germany. Customers are welcome to inquire and place orders.