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    Tag: what is

    What is Synchronous Motor?

    Synchronous motor is an AC motor that generates torque by the interaction of the excitation magnetic field supplied by a direct current and the rotating magnetic field of the armature, and rotates at a synchronous speed. It belongs to AC motors, and the stator windings are the same as synchronous motor. Because its rotor rotation speed is the same as the speed of the rotating magnetic field generated by the stator winding, it is called synchronous motor.

    When a synchronous motor is working, three-phase symmetrical current flows into the three-phase windings of the stator, and direct current flows into the excitation winding of the rotor. As three-phase alternating current is passed through the three-phase symmetric winding of the stator, rotating magnetic field will be generated in the air gap. Static magnetic field with a constant polarity is generated when direct current is applied to the rotor field winding. If the number of magnetic pole pairs of the rotor magnetic field is equal to the number of magnetic pole pairs of the stator magnetic field, the rotor magnetic field will rotate synchronously with the stator rotating magnetic field due to the magnetic pulling force of the stator magnetic field.

    Step Up & Down Transformers

    Transformer is a device that transform AC voltage, current and impedance. It uses the principle of electromagnetic induction to transform AC power of one voltage level into AC power of another voltage level. When an AC current is passed through the primary coil, an AC magnetic flux is generated in the iron core, causing a voltage (or current) to be induced in the secondary coil. It is composed of an iron core and a coil. The coil has two or more windings. The winding connected to the power supply is called the primary winding, and the remaining windings are called the secondary winding.

    Transformer mainly uses the principle of electromagnetic induction to work. The specific process is when an AC voltage U1 is applied to the primary side of the transformer, and the current flowing through the primary winding is I1, the current will generate alternating magnetic flux in the iron core, which makes the primary winding and the secondary winding electromagnetically connections.

    What is Air Blower?

    The air blower is mainly composed of the following six parts: motor, air filter, blower body, air chamber, base (and oil tank), drip nozzle. The blower operates eccentrically on the rotor offset in the cylinder, and changes the volume between the blades in the rotor slot to suck in, compress, and discharge air. During operation, the pressure difference of the blower is used to automatically send the lubrication to the drip nozzle and drip into the cylinder to reduce friction and noise, while keeping the gas in the cylinder from returning. This type of air blower is also called a sliding vane blower. There are many types of air blowers, mainly divided into the following categories.

    What is Vibration Meter?

    Vibration meter is an instrument used to measure the peak value, peak-to-peak value, average value or root mean square value of vibration such as velocity, acceleration and displacement. The vibration meter can be applied in mechanical manufacturing, electric metallurgy, general aviation etc. The main parts of this instrument are integral differential circuit, amplifying circuit, voltage detector and meter head. The integral differential circuit is used to complete the integral differential operation between the above vibration quantities. Generally, integral and differential operational amplifiers can be used, low-pass filters and high pass filters can also be used to complete integral differential operations. However, we should pay attention to this instrument's application frequency range when we are using it for calculation. The vibration meter can only obtain the total intensity (vibration level) of the vibration, but cannot obtain other information, so its scope of using is limited.

    What Is a Current Transformer?

    A current transformer is an instrument that converts a large current on the primary side into a small current on the secondary side based on the principle of electromagnetic induction. The current transformer is composed of a closed core and windings. Its primary winding has a few turns and is stringed in the line of the current that needs to be measured. According to different uses, current transformers can be roughly divided into two categories: current transformers for measurement and current transformers for protection.

    What is Displacement Sensor?

    Displacement sensor, also known as linear sensor, is a linear device belonging to metal induction. The function of the sensor is to convert various measured physical quantities into electricity. According to the different forms of the measured variable, the displacement sensor can be divided into two types: the analog type and the digital type. The former can also be divided into two types: the physical type and the structure type. Commonly used displacement sensors are mostly analog structures, including potentiometer type displacement sensors, inductive displacement sensors, self-aligning machine, capacitive displacement sensors, eddy current displacement sensors, and Hall-type displacement sensors.

    What is an Industrial Vacuum Cleaner?

    Industrial vacuum cleaner is an environmentally friendly cleaning equipment commonly used in industry. The equipment is used to collect waste, filter and purify the air in the industrial production process, and clean the dust and particles in the environment. Industrial vacuum cleaners are widely used in various fields such as textiles, chemicals, machinery, medicine, casting, etc., which can prevent some occupational disease hazards and improve production efficiency.

    What are the Types of Spectrophotometer?

    Spectrophotometer is also called spectrometer, which is a scientific instrument that decomposes complex light into spectral lines. Using spectrophotometry, the spectrophotometer measures the absorbance of the measured substance at a specific wavelength or within a certain wavelength range to perform qualitative and quantitative analysis of the substance. The basic principles of different types of spectrophotometers are similar. They all use a light source that can generate multiple wavelengths, through a series of light splitting devices, to form a light source of a specific wavelength. After the light source passes through the test sample, part of the light source is absorbed. Subsequently, by measuring the absorbance of the sample, it can be converted into the concentration of the sample after calculation. The absorbance of the sample is proportional to the concentration of the sample.

    What is a Magnetic Stirrer?

    A magnetic stirrer also known as magnetic mixer is a kind of laboratory equipment which is mainly used for stirring or heating stirring in low-viscosity liquid or solid-liquid mixing experiments. A rotating magnetic field is generated under the container plate, and the principle of homosexual repulsion and heterosexual attraction is used to push the magnetic stirring rod in the container to rotate rapidly, thereby achieving the purpose of stirring. The plate usually has a heating function to meet more experimental needs.

    What is a Hipot Tester?

    Hipot tester, also called dielectric strength tester, is used to carry out the test of applying a specified AC or DC high voltage between the live part and the non-live part of the electric appliance to check the hipot of the insulating material of the electric appliance. In long-term work, electrical appliances must not only bear the effect of rated working voltage, but also bear the effect of overvoltage that is higher than the rated working voltage for a short time during operation(The overvoltage value may be several times higher than the rated working voltage value). Under the action of these voltages, the internal structure of electrical insulating materials will change. When the overvoltage intensity reaches a certain value, it will cause the insulation breakdown of the material. The electrical appliances will not operate normally, and the operator may get an electric shock, endangering personal safety. The main electrical safety test indicators include AC/DC hipot, insulation resistance, leakage current, ground resistance, etc. AC/DC hipot tester is used to test the electrical safety performance of the product under actual working conditions, so it is one of the important instruments for testing the electrical safety performance of the equipment.

    Working Principle of Fan Heater

    Industrial fan heater refers to electric heating equipment used in industrial fields such as factories and workshops. It is mainly composed of air heaters and fans. It uses advanced and efficient non-red  electric heating tubes. The machine is equipped with imported high-efficiency light trigger switches,  which are easy and reliable to operate.

    Types of Vacuum Pump

    In recent years, a new type of vacuum pump that can be achieved from atmospheric pressure to high vacuum with only one pump has been developed, but generally speaking, for obtaining high vacuum, ultra-high vacuum and extremely high vacuum, multiple vacuum pumps are connected in series to complete the pumping task. Thus, knowing the type of pumps properly is important for user to choose affordable and suitable vacuum pump.

    What is a Gas Detector?

    Gas detector is an instrument for detecting the concentration of gas leakage, including portable gas detector, hand-held gas detector, fixed gas detector, online gas detector, etc. It mainly uses a gas sensor to detect the types of gases present in the environment, and the gas sensor is a sensor used to detect the composition and content of the gas.

    What is an Automatic Screw Feeder?

    An automatic screw feeder is an automatic device that replaces human hands to take, put and tighten the screws by automatic mechanism, which mainly applies for automatic assembly, such as producing car components, computers, display screens, motors, lamps and lanterns, mobile phones, printers, circuit boards and batteries. It can extremely improve production efficiency and reliability as well as reduce production costs. 

    Automatic screw feeders are divided into the handheld automatic screw feeder and the fully automatic screw feeder. 

    What is a 3-phase Isolation Transformer?

    The principle of three-phase isolation transformer basically adopts the principle of electromagnetic induction. It is safe to use a three-phase isolation transformer, which is generally used as a maintenance power supply. The isolation transformer is commonly 1:1 transformer, but it has different specifications. Three-phase isolation transformers are used for changing voltage, lighting, power supply and rectifying power supply, widely applied to industrial and mining enterprises, power plants, airports, high-rise buildings, subways and other places with high fire safety requirements.

    What is the Purpose of an Isolation Transformer?

    Isolation transformer is the transformer with electrical isolation between the input winding and the output winding. Isolation transformer is used to avoid users accidentally touching the charged body at the same time. Isolation transformer, whose transformer ratio is usually 1:1, is a special transformer with high insulation strength between the primary winding and secondary winding to isolate different potential to suppress common mode interference. The main function of the step-up & step-down isolation transformer is to completely insulate the primary side and the secondary side, and also to isolate the loop. In addition, the high frequency loss of the iron core is used to suppress the high frequency clutter into the control loop. 

    What is the Chemical Element Analysis Instrument?

    What is the principle of the chemical element analysis instrument?
    Chemical analysis instrument is mainly used for in-site measurement of elements in metal materials in the military industry, aerospace, iron and steel, petrochemical, power, pharmaceutical and other fields, it's an indispensable tool for rapid identification of materials in the industrial and military manufacturing fields accompanying the rise of the world economy.
    Principle of chemical element analysis instrument.

    What is the Fiber Optic Sensor?

    What is the fiber optic sensor

    Fiber optic sensor is a medium that transmits light waves by the principle of complete internal reflection of light, it consists of a core and cladding with a high refractive index. The refractive index of the cladding is smaller than that of the core, and its diameter is about 0.1mm~0.2mm. When the light penetrates into the fiber core through the end face and reaching the interface with the cladding, the light is reflected back to the fiber core due to the complete internal reflection of the light. After constant reflection, the light propagates along the fiber core and has only a slight attenuation. In actual detection process, the fiber optic sensor guides the light emitted by the transmitter to the detection point through light-guide fiber, and then guides the detected optical signal to the receiver through light-guide fiber, the detection is thereof realized. According to the different manner of execution, the fiber optic sensor can also be divided into various types, such as opposite type, diffuse reflectance type. Fiber optic sensor can detect objects in the far area. Due to the fiber loss and fiber dispersion, the intermediate amplifier shall be set at a proper position for long-distance fiber transmission system, so as to process and amplify the attenuated and distorted light pulse signals.

    What is the harm of transformer three-phase imbalance?

    Three-phase imbalance means that inconsistent amplitude of three-phase current (or voltage) in electrical power system and that amplitude difference surpasses the specified range.
    Unbalanced current of transformer refers to current difference of three-phase transformer windings. The current difference is mainly caused by different three-phase load. Asymmetry of load gives rise to asymmetry of three-phase current which flow through transformer. And current asymmetry causes asymmetry of three-phase impedance drop of transformer, thus three-phase voltage of secondary side is asymmetric, which will do harm to transformer and electric equipment.