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  • What special requirements are there when the explosion-proof motor is overhauled

    The explosion-proof motor shall not disassemble; disassembly and maintenance, can not use parts of the fulcrum of the explosion-proof surface as the crowbar but not allowed to beat or strike, explosion-proof surface. When disassembling the motor, should take the lee cover, fan, bolts, and then remove the cover plate hand casing and the bearing cap is then made of logs or copper rod along the axial direction of the shaft extension end of the collision, separate cover and a base, finally remove th

  • Quality essentials of hydrostatic test for explosion proof motor

    The components of the motor shell must be tested after hydrostatic test for one minute. The test results are qualified by discontinuous dripping, and the following points should be paid attention to when doing hydrostatic test:1. for hydrostatic test, the parts must be handled with care, and pay attention to the protection of the explosion-proof surface, prevent knock.2. after water pressure test, parts of the internal water and foreign body clean, to prevent rust, after drying parts, processing

  • Common voltage class for explosion proof electrical system

    Coal mine power supply system is generally ground substation, 10KV or 6KV power supply through the underground central substation, mining area substation until the power distribution point of the work surface, basically belongs to the vertical mode of four power supply system. The development of electrical equipment in coal mine is developing along with the change of power supply voltage level. Power supply voltage generally adopt 1140V voltage level of 380V and 660V, using comprehensive mechani

  • What are the requirements of explosion proof motor in overhaul

    The explosion-proof motor shall not disassemble; disassembly and maintenance, can not use parts of the fulcrum of the explosion-proof surface as the crowbar but not allowed to beat or strike, explosion-proof surface. When disassembling the motor, should take the lee cover, fan, bolts, and then remove the cover plate hand casing and the bearing cap is then made of logs or copper rod along the axial direction of the shaft extension end of the collision, separate cover and a base, finally remove th

  • The working principle of three phase asynchronous motor

    (1) the generation of rotor induced currentWhen the stator winding of the motor is connected to three-phase alternating current, will produce a rotating magnetic field rotation speed to NS between the stator and the rotor, the rotor is still at the beginning, so the rotor conductor will be rotating magnetic field cutting, according to the principle of relative motion, we can also put the magnetic field as real, and the rotor conductors relative to the magnetic field rotary cutting magnetic lines

  • Generation of rotating magnetic field

    In our discussion of the three-phase asynchronous motor, the rotating magnetic field is composed of three-phase sinusoidal AC stator windings pass into the power of each phase windings have the corresponding magnetic field, due to the size and direction of the current is continuously changing with time, so each phase winding direction of the magnetic field is constant change, through the most simple in star connection poles of the stator winding can be seen as an example, the synthesis of magnet

  • Efficiency is the most important technical and economic index of motor

    Efficiency is the most important technical and economic index of motor Low voltage asynchronous motor load rate is generally between 50%~80%, mostly in the range of 60%~70%. The efficiency of asynchronous motor variable changes in different load rate and the loss of motor (stator and rotor winding copper loss) and constant loss (iron loss and mechanical loss) of the proportion, in total loss, variable loss increases, constant loss is reduced and the highest efficiency is equal to the low load ra

  • Definition of quota and rating

    1, the quota refers to a set of ratings and operating conditions.Quota categories are: the amount of continuous work in accordance with the corresponding S1 workShort term work amount corresponding to the S2 workThe amount of cycle work is determined by S3~S8The amount of non cycle work is corresponding to the S9 operating systemThe amount of work done by discrete constant load corresponds to the S10 operating system。 2, the rated value refers to a variety of numerical characterization motor n

  • Product code composition and the role of each part

    Product Code: by the motor type code, motor characteristics, code, design sequence number and excitation mode code, such as the composition of the order of four. type code is to characterize the various types of motor and the use of Chinese phonetic alphabet. the characteristics of the code is to characterize the performance of the motor, structure or use, but also the use of Chinese phonetic alphabet. the design of serial number is the order of the motor product design, using Arabia digital rep

  • Rotor components and the definition of the role of each part

    Rotor: the rotating part of the motor is called the rotor, mainly by the rotor core, rotor winding and rotating shaft and so on.

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