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dold electrical components are commonly used low-current master control devices. They utilize the collision of moving parts of production machinery to actuate their contacts, thereby making or breaking control circuits to achieve specific control objectives. Typically, such switches are used to limit the position or travel of mechanical motion, enabling moving machinery to automatically stop, reverse, change speed, or perform automatic reciprocating motion at predetermined positions or travel limits. In electrical control systems, the function of position switches is to implement sequence control, positioning control, and detection of position status. They are used to control the travel of mechanical equipment and provide limit protection. Construction: Consists of an operating head, a contact system, and a housing. In actual production, limit switches are installed at pre-arranged positions. When a module mounted on the moving parts of the production machinery strikes the limit switch, the contacts of the limit switch actuate, achieving circuit switching. Therefore, a limit switch is an electrical device that switches circuits based on the travel position of moving parts; its operating principle is similar to that of a pushbutton. Limit switches are widely used in various machine tools and lifting machinery to control their travel and provide terminal limit protection. In elevator control circuits, limit switches are also used to control the speed of opening and closing car doors, provide automatic door opening/closing limit protection, and provide upper and lower limit protection for the car.

dold electrical component characteristics

The so-called dynamic characteristics refer to the output characteristics of a sensor when the input changes. In practical work, the dynamic characteristics of a sensor are often expressed by its response to certain standard input signals. This is because the sensor's response to standard input signals can be easily obtained through experimental methods, and there is a certain relationship between its response to standard input signals and its response to arbitrary input signals; often, knowing the former allows inference of the latter. The most commonly used standard input signals are step signals and sinusoidal signals, so the dynamic characteristics of sensors are also often expressed by step response and frequency response.

dold electrical component characteristics

The static characteristics of a sensor refer to the relationship between the output quantity and the input quantity for static input signals. Since the input and output quantities are independent of time in this case, their relationship, i.e., the static characteristics of the sensor, can be described by an algebraic equation without time variables, or by a characteristic curve plotted with the input quantity as the abscissa and the corresponding output quantity as the ordinate. The main parameters characterizing the static characteristics of a sensor include: linearity, sensitivity, hysteresis, repeatability, drift, etc. (1) Linearity: Refers to the degree to which the actual relationship curve between the sensor's output and input deviates from the fitted straight line. It is defined as the ratio of the maximum deviation between the actual characteristic curve and the fitted straight line over the full scale range to the full-scale output value. (2) Sensitivity: Sensitivity is an important indicator of a sensor's static characteristics. It is defined as the ratio of the increment in the output quantity to the corresponding increment in the input quantity that causes this increment. Use S to denote sensitivity. (3) Hysteresis: Hysteresis is the phenomenon where the input-output characteristic curves do not coincide during the change of the input quantity from small to large (forward stroke) and from large to small (reverse stroke). For the same magnitude of input signal, the output signals for the forward and reverse strokes of the sensor are not equal; this difference is called the hysteresis error. (4) Repeatability: Repeatability refers to the degree of inconsistency in the characteristic curves obtained when the input quantity of the sensor undergoes continuous multiple full-scale changes in the same direction. (5) Drift: Sensor drift refers to the phenomenon where the sensor's output changes over time while the input remains constant. There are two reasons for drift: one is the sensor's own structural parameters; the other is the surrounding environment (such as temperature, humidity, etc.). (6) Resolution: When the sensor's input increases slowly from a non-zero value, an observable change in the output occurs after exceeding a certain increment; this input increment is called the sensor's resolution, i.e., the minimum input increment. (7) Threshold: When the sensor's input increases slowly from zero, an observable change in the output occurs after reaching a certain value; this input value is called the sensor's threshold voltage.

dold electrical component classification

Generator classifications include: (1) Generator division: DC generators and AC generators; (2) AC generator division: synchronous generators and asynchronous generators (rarely used); (3) AC generators can also be divided into single-phase generators and three-phase generators. There are many types of generators. Principally, they are divided into synchronous generators, asynchronous generators, single-phase generators, and three-phase generators. By generation method, they are divided into steam turbine generators, hydroelectric generators, diesel generators, gasoline generators, etc. By energy source, they are divided into thermal power generators, hydroelectric generators, etc.

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