German MINIMAX sensors, MINIMAX models, MINIMAX prices

MINIMAX sensors are devices that convert magnetic signals into electrical signals. By leveraging the transformation relationship between magnetic quantities and other physical quantities, using a magnetic field as the medium, they can also convert signals of other non-electrical physical quantities into electrical signals. There are two drive methods: one uses a permanent magnet for drive, and the other uses an electromagnetic coil for drive. The former is mostly used for detection; for example, if a moving part is made of a magnet, it will attract and emit a signal once it approaches the magnetic induction sensor. The latter is mostly used for control; if the electromagnetic coil is energized, the contacts will attract. Using magnetic induction sensors to replace limit switches that rely on collision contact can improve system reliability and service life; therefore, they are often used in programmable logic controllers as signaling devices for position arrival.

MINIMAX sensor classification

1) Laser speed measurement: With the rise of modern precision manufacturing and the demand for cost savings, non-contact speed sensors will gradually replace contact speed sensors. Currently, the non-contact laser speed sensors with higher accuracy and most common use on the market are ZLS-Px aberration speed sensors. Aberration speed sensors have two ports: one transmitting port that emits a LED light source; and one high-speed photography port that achieves CCD area high-speed imaging comparison. By comparing images at two points in time within an extremely short period, the distance the measured object moves is resolved, and combined with algorithms inside the sensor, the speed of the measured object is output 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 fixing screw holes. The (1) LED light emission port emits laser light toward the measured object, which reflects to the (2) camera reception port. After receiving the signal, it is transmitted to the signal processor, which calculates its speed through algorithms. ZLS-Px aberration speed sensors can simultaneously measure speed and length in two directions. They can not only detect whether the measured body has stopped but also detect the direction of motion of the measured body. Fix the sensor on a stable bracket to ensure that the rotating object does not produce excessive vibration during rotation, thereby enabling the measurement of the angle of rotation and rotational speed of the rotating measured body. 2) Radar speed measurement: Traditional speed measurement mostly involves rotary motion speed measurement and linear motion speed measurement. However, there are many irregular speed measurements in industrial automation reality, such as athlete motion speed measurement, traffic vehicle speed measurement, and golf ball speed measurement. In these cases, radar speed sensors can meet these requirements.

MINIMAX sensor principle

Transmissive speed sensors consist of a slotted or notched disk, a light source, and a phototube. When the disk rotates with the measured shaft, 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 there is no signal output at the output terminal. 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 taken as 1s, the rotational speed of the measured shaft can be read directly. The principle of reflective speed sensors is the same as that of transmissive sensors; they convert changes in sensed light into changes in electrical signals via a phototube, but they obtain pulse signals through light reflection. Typically, reflective material is adhered to the measurement area of the measured shaft to form a reflective surface. Commonly used reflective materials include special speed-measuring reflective paper tape (adhesive tape); aluminum foil and other reflective materials can also be used as substitutes, and sometimes white paint can be applied to the measured area as a reflective surface. The projector 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 illumination 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 photoelectric speed sensors 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 conditions with strong vibration. Reflective types have no mechanical connection with the measured shaft and are convenient to use.

MINIMAX sensor industry applications

1) Modern automobiles 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 sensor measuring vehicle running speed will greatly affect 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, featuring high sensitivity to magnetic fields, stable output signals, high frequency response, strong anti-electromagnetic interference capability, 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 periodic changes in the magnetic field passing through the Hall element, which induces changes in the output voltage of the Hall element. Subsequent circuit processing forms stable pulse voltage signals as the output signal of the speed sensor. Main electrical technical parameters of Hall-structure speed sensors include: output signal high voltage, low voltage, duty cycle, period, rise time, fall time, and number of pulses per cycle. To ensure product performance reliability, quantitative testing of these parameters must be performed before factory shipment. Test systems featuring integration and intelligence, efficient automatic measurement, software calculation, and graphical or tabular display of test results are increasingly favored by automotive speed sensor manufacturers. A comprehensive testing device developed for performance measurement of commonly used Hall-effect vehicle speed sensors. Based on cost considerations, the high-speed counter port of a microprocessor is used for data acquisition from the vehicle speed sensor, and software control is used to implement calculation and graphical display processing of the acquired data. The completed testing device offers advantages such as high testing accuracy, reliable data communication, a user-friendly graphical interface, strong anti-interference capability, simple and intuitive testing process, and low system development cost. It has good market promotion potential, so speed sensors will have huge application prospects in vehicle speed detection. 2) Speed sensors for belt conveyors adopt Hall sensors, which are sensors that primarily utilize the Hall effect to achieve magneto-electric conversion. The Hall effect has a development history of more than 100 years since its discovery in 1879, but 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 70s of the 20th century. After nearly several decades of research and development, it is now possible to produce Hall elements with various performances, such as ordinary type, high-sensitivity type, low-temperature-coefficient type, temperature-and-magnetic-measuring type, and switch-type Hall elements. Due to the characteristics of Hall sensors, such as high sensitivity, good linearity, high stability, small size, and high-temperature resistance, they have been widely applied in various industrial fields including non-electrical quantity measurement automatic control, computer devices, and modern military technology.

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