German DONMEZ sensors, DONMEZ models, DONMEZ prices

DONMEZ sensors, also known as torque sensors, torsion sensors, torque meters, are divided into two main categories: dynamic and static. Among them, dynamic torque sensors are also called torque sensors, torque-speed sensors, non-contact torque sensors, rotary torque sensors, etc. 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, offering advantages such as high precision, fast frequency response, good reliability, and long service life.

DONMEZ Sensor Classification

1) Laser Speed Measurement: With the rise of precision manufacturing and the need for cost savings, non-contact speed sensors are gradually replacing contact speed sensors. Currently, the most common and high-precision 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 terminal blocks, and (5) are 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 the rotation process does not generate excessive vibration, allowing accurate measurement of the rotating object's angle and speed. 2) Radar Speed Measurement: Traditional speed measurement mostly focuses on rotational and linear motion speeds. However, industrial automation often involves irregular speed measurements, such as athlete motion tracking, traffic vehicle speed monitoring, and golf ball speed measurement. Radar speed sensors can meet these requirements.

DONMEZ 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 shaft under measurement, light can only reach the phototube through the holes or notches. When the phototube is illuminated, its reverse resistance is very low, thus outputting an electrical pulse signal. When the light source is blocked by the disk, the reverse resistance of the phototube is very high, and no signal is output from the output terminal. In this way, based on the number of holes or notches on the disk, the rotational speed of the shaft under measurement can be determined. The number of holes or notches on the disk is usually set to sixty, so for each revolution of the shaft under measurement, 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 shaft under measurement can be read directly. The principle of a reflective speed sensor is the same as that of a transmissive one; it converts changes in received light into changes in electrical signals via a phototube, but it obtains pulse signals through light reflection, typically by adhering reflective material to the measurement area of the shaft under measurement to form a reflective surface. Commonly used reflective materials include dedicated speed-measurement reflective tape (adhesive tape), aluminum foil or other reflective materials may also be used as substitutes, and sometimes white paint can be applied to the measurement area to serve as a reflective surface. The emitter and the reflective surface must be properly configured, typically, the distance between them is 5-15M. When the measured shaft rotates, the photoelectric element receives pulsating light, and outputs corresponding electrical signals to the electronic counter, thereby measuring the rotational speed of the measured shaft. The waveform of the output signal from the photoelectric speed sensor is relatively regular, close to a standard square wave, with almost no interference signals generated. However, for transmissive types, vibration reduces the lifespan of the light source, so they are not suitable for use under conditions with strong vibration. The reflective type has no mechanical connection with the measured shaft, making it convenient to use.

DONMEZ 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 signal from the vehicle speed sensor will have a significant impact on these control units. Automotive speed sensors mostly adopt a Hall-effect structure. A Hall speed sensor is a magneto-electric sensor based on the Hall effect, characterized by high sensitivity to magnetic fields, stable output signal, high frequency response, strong resistance to electromagnetic interference, simple structure, and ease of use. It mainly consists of permanent magnets with a specific number of pole pairs (generally 4 or 8 pairs), Hall elements, a rotating mechanism, and input/output connectors. Its working principle is that when the sensor's rotating mechanism rotates under external drive, it drives the permanent magnet to rotate, causing the magnetic field passing through the Hall element to change periodically, causes a change in the output voltage of the Hall element, which is processed by subsequent circuits to form a stable pulse voltage signal, serving as the output signal of the vehicle speed sensor. The main electrical technical parameters of Hall-effect speed sensors include: high output voltage, low output voltage, duty cycle, period, rise time, fall time, number of pulses per period, etc., To ensure product performance and reliability, these parameters must be quantitatively tested before leaving the factory. Test systems featuring integration and intelligence, efficient automatic measurement, software computation, and graphical or tabular display of test results are increasingly favored by automotive speed sensor manufacturers. It is a comprehensive testing device developed for performance measurement of commonly used Hall-effect vehicle speed sensors. Considering cost factors, the high-speed counter port of a microprocessor is used for data acquisition from the vehicle speed sensor, and software control is employed to compute the acquired data and process it for graphical display. The completed testing device offers advantages such as high testing accuracy, reliable data communication, a user-friendly graphical interface, strong anti-interference capability, a simple and intuitive testing process, and low system development costs, having good potential for market adoption, therefore, speed sensors will have significant application prospects in vehicle speed detection. 2) The speed sensor of the belt conveyor uses a Hall sensor, which is primarily a sensor that utilizes the Hall effect to achieve magneto-electric conversion, Since the Hall effect was discovered in 1879, it has a development history of more than 100 years, but its application began in the 50s of this century, Due to the rapid development of microelectronics, it has gained attention and widespread adoption, and various types of Hall elements have been continuously developed. China began to increase research on Hall elements in the 70s of the 20th century, After nearly several decades of research and development, it is now capable of producing Hall elements with various performance characteristics, For example: standard type, high-sensitivity type, low-temperature-coefficient type, temperature-and-magnetic-field sensing type, and switching-type Hall elements. Due to the characteristics of Hall sensors, such as high sensitivity, good linearity, high stability, compact size, and high-temperature resistance, they have been widely applied in various industrial fields, including non-electrical quantity measurement and automatic control, computer devices, and modern military technology.

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