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M2JAX explosion-proof motor

The following is the model of ABB explosion-proof motor:

M2JA80M2A  M2JA80M2B  M2JA90S2A  M2JA90L2A  M2JA100L2A  M2JA112M2A  M2JA132S2A M2JA132S2B  M2JA160M2A  M2JA160M2B  M2JA160L2A  M2JA180M2A  M2JA200L2A  M2JA200L2B  M2JA225M2A  M2JA250M2A  M2JA280S2A  M2JA280M2A  M2JA315S2A  M2JA315M2A  M2JA315L2A  M2JA315L2B  M2JA355M2A  M2JA355L2A  M2JA80M4A  M2JA80M4B  M2JA90S4A  M2JA90L4A  M2JA100L4A  M2JA100L4B  M2JA112M4A  M2JA132S4A M2JA132M4A  M2JA160M4A  M2JA160L4A  M2JA180M4A  M2JA180L4A  M2JA200L4A  M2JA225S4A M2JA225M4A M2JA250M4A  M2JA280S4A  M2JA280M4A  M2JA315S4A  M2JA315M4A  M2JA315L4A  M2JA315L4B  M2JA355M4A  M2JA355L4A  M2JA80M6A  M2JA80M6B  M2JA90S6A  M2JA90L6A  M2JA100L6A  M2JA112M6A  M2JA132S6A  M2JA132M6A  M2JA132M6B  M2JA160M6A  M2JA160L6A M2JA180L6A  M2JA200L6A M2JA200L6B  M2JA225M6A  M2JA250M6A  M2JA280S6A  M2JA280M6A  M2JA315S6A  M2JA315M6A  M2JA315L6A  M2JA315L6B  M2JA355M6A  M2JA355M6B  M2JA355L6A  M2JA80M8A  M2JA80M8B  M2JA90S8A  M2JA90L8A  M2JA100L8A  M2JA100L8B  M2JA112M8A  M2JA132S8A  M2JA132M8A  M2JA160M8A  M2JA160M8B  M2JA160L8A  M2JA180L8A  M2JA200L8A  M2JA225S8A  M2JA225M8A  M2JA250M8A  M2JA280S8A  M2JA280M8A  M2JA315S8A  M2JA315M8A  M2JA315L8A  M2JA315L8B  M2JA-BP80M2A  M2JA-BP80M2B  M2JA-BP90S2A  M2JA-BP90L2A  M2JA-BP100L2A  M2JA-BP112M2A  M2JA-BP132S2A  M2JA-BP132S2B  M2JA-BP160M2A  M2JA-BP160M2B  M2JA-BP160L2A  M2JA-BP180M2A  M2JA-BP200L2A  M2JA-BP200L2B  M2JA-BP225M2A  M2JA-BP250M2A  M2JA-BP280S2A  M2JA-BP280M2A  M2JA-BP315S2A M2JA-BP315M2A M2JA-BP315L2A  M2JA-BP315L2B  M2JA-BP355M2A  M2JA-BP355L2A  M2JA-BP80M4A  M2JA-BP80M4B M2JA-BP90S4A M2JA-BP90L4A  M2JA-BP100L4A  M2JA-BP100L4B  M2JA-BP112M4A  M2JA-BP132S4A  M2JA-BP132M4A  M2JA-BP160M4A  M2JA-BP160L4A  M2JA-BP180M4A M2JA-BP180L4A  M2JA-BP200L4A  M2JA-BP225S4A  M2JA-BP225M4A  M2JA-BP250M4A  M2JA-BP280S4A  M2JA-BP280M4A  M2JA-BP315S4A  M2JA-BP315M4A  M2JA-BP315L4A  M2JA-BP315L4B  M2JA-BP355M4A  M2JA-BP355L4A  M2JA-BP80M6A M2JA-BP80M6B  M2JA-BP90S6A  M2JA-BP90L6A  M2JA-BP100L6A  M2JA-BP112M6A  M2JA-BP132S6A  M2JA-BP132M6A M2JA-BP132M6B  M2JA-BP160M6A  M2JA-BP160L6A  M2JA-BP180L6A  M2JA-BP200L6A  M2JA-BP200L6B  M2JA-BP225M6A  M2JA-BP250M6A  M2JA-BP280S6A  M2JA-BP280M6A  M2JA-BP315S6A  M2JA-BP315M6A  M2JA-BP315L6A  M2JA-BP315L6B  M2JA-BP355M6A  M2JA-BP355M6B  M2JA-BP355L6A  M2JA-BP80M8A  M2JA-BP80M8B  M2JA-BP90S8A  M2JA-BP90L8A  M2JA-BP100L8A  M2JA-BP100L8B  M2JA-BP112M8A  M2JA-BP132S8A  M2JA-BP132M8A  M2JA-BP160M8A  M2JA-BP160M8B  M2JA-BP160L8A  M2JA-BP180L8A M2JA-BP200L8A  M2JA-BP225S8A  M2JA-BP225M8A  M2JA-BP250M8A  M2JA-BP280S8A  M2JA-BP280M8A  M2JA-BP315S8A  M2JA-BP315M8A  M2JA-BP315L8A  M2JA-BP315L8B  M2JA-H80M2A M2JA-H80M2B  M2JA-H90S2A  M2JA-H90L2A  M2JA-H100L2A  M2JA-H112M2A  M2JA-H132S2A  M2JA-H132S2B  M2JA-H160M2A  M2JA-H160M2B  M2JA-H160L2A  M2JA-H180M2A  M2JA-H200L2A  M2JA-H200L2B M2JA-H225M2A  M2JA-H250M2A  M2JA-H280S2A  M2JA-H280M2A  M2JA-H315S2A  M2JA-H315M2A M2JA-H315L2AM2JA-H315L2B  M2JA-H355M2A  M2JA-H355L2A  M2JA-H80M4A  M2JA-H80M4B  M2JA-H90S4A  M2JA-H90L4A  M2JA-H100L4A  M2JA-H100L4B  M2JA-H112M4A  M2JA-H132S4A  M2JA-H132M4A  M2JA-H160M4A  M2JA-H160L4A  M2JA-H180M4A  M2JA-H180L4A  M2JA-H200L4A  M2JA-H225S4A  M2JA-H225M4A  M2JA-H250M4A  M2JA-H280S4A  M2JA-H280M4A  M2JA-H315S4A  M2JA-H315M4A  M2JA-H315L4A  M2JA-H315L4B  M2JA-H355M4A  M2JA-H355L4A  M2JA-H80M6A  M2JA-H80M6B  M2JA-H90S6A  M2JA-H90L6A M2JA-H100L6A  M2JA-H112M6A  M2JA-H132S6A  M2JA-H132M6A  M2JA-H132M6B  M2JA-H160M6A  M2JA-H160L6A  M2JA-H180L6A  M2JA-H200L6A M2JA-H200L6B  M2JA-H225M6A  M2JA-H250M6A  M2JA-H280S6A  M2JA-H280M6A  M2JA-H315S6A  M2JA-H315M6A M2JA-H315L6A  M2JA-H315L6B  M2JA-H355M6A  M2JA-H355M6B  M2JA-H355L6A  M2JA-H100L8A M2JA-H100L8B  M2JA-H112M8A  M2JA-H132S8A  M2JA-H132M8A  M2JA-H160M8A  M2JA-H160M8B  M2JA-H160L8A  M2JA-H180L8A  M2JA-H200L8A  M2JA-H225S8A  M2JA-H225M8A  M2JA-H250M8A  M2JA-H280S8A  M2JA-H280M8A  M2JA-H315S8A  M2JA-H315M8A  M2JA-H315L8A  M2JA-H315L8B M2JAX80M2A  M2JAX80M2B  M2JAX90S2A M2JAX90L2A M2JAX100L2A  M2JAX112M2A  M2JAX132S2A  M2JAX132S2B  M2JAX160M2A  M2JAX160M2B  M2JAX160L2A  M2JAX180M2A  M2JAX200L2A  M2JAX200L2B  M2JAX225M2A  M2JAX250M2A  M2JAX280S2A  M2JAX280M2A M2JAX315S2A  M2JAX315M2A  M2JAX315L2A  M2JAX315L2B  M2JAX355M2A  M2JAX355L2A  M2JAX80M4A  M2JAX80M4B  M2JAX90S4A M2JAX90L4A  M2JAX100L4A  M2JAX100L4B  M2JAX112M4A  M2JAX132S4A  M2JAX132M4A  M2JAX160M4A  M2JAX160L4A  M2JAX180M4A M2JAX180L4A  M2JAX200L4A M2JAX225S4A M2JAX225M4A M2JAX250M4A  M2JAX280S4A  M2JAX280M4A  M2JAX315S4A  M2JAX315M4A  M2JAX315L4A  M2JAX315L4B  M2JAX355M4A  M2JAX355L4A  M2JAX80M6A  M2JAX80M6B  M2JAX90S6A  M2JAX90L6A  M2JAX100L6A M2JAX112M6A  M2JAX132S6A  M2JAX132M6A  M2JAX132M6B  M2JAX160M6A  M2JAX160L6A  M2JAX180L6A  M2JAX200L6A M2JAX200L6B M2JAX225M6A  M2JAX250M6A  M2JAX280S6A M2JAX280M6A  M2JAX315S6A  M2JAX315M6A M2JAX315L6A M2JAX315L6B  M2JAX355M6A  M2JAX355M6B  M2JAX355L6A  M2JAX80M8A  M2JAX80M8B  M2JAX90S8

M2JAX90L8A  M2JAX100L8A  M2JAX100L8B  M2JAX112M8A M2JAX132S8A  M2JAX132M8A  M2JAX160M8A  M2JAX160M8B  M2JAX160L8A  M2JAX180L8A  M2JAX200L8A M2JAX225S8A M2JAX225M8A  M2JAX250M8A  M2JAX280S8A  M2JAX280M8A  M2JAX315S8A  M2JAX315M8A  M2JAX315L8A M2JAX315L8B M2GP80M2A  M2GP80M2B  M2GP90S2A  M2GP90L2A  M2GP100L2A  M2GP112M2A  M2GP132S2A  M2GP132S2B  M2GP160M2A  M2GP160M2B  M2GP160L2A  M2GP180M2A  M2GP200L2A  M2GP200L2B  M2GP225M2A  M2GP250M2A  M2GP280S2A  M2GP280M2A  M2GP315S2A  M2GP315M2A  M2GP315L2A  M2GP315L2B  M2GP355M2A  M2GP355L2A  M2GP80M4A  M2GP80M4B  M2GP90S4A  M2GP90L4A  M2GP100L4A M2GP100L4B  M2GP112M4A  M2GP132S4A  M2GP132M4A  M2GP160M4A  M2GP160L4A  M2GP180M4A  M2GP180L4A  M2GP200L4A  M2GP225S4A  M2GP225M4A  M2GP250M4A  M2GP280S4A M2GP280M4A M2GP315S4A M2GP315M4A  M2GP315L4A  M2GP315L4B  M2GP355M4AM2GP355L4A  M2GP80M6A  M2GP80M6B  M2GP90S6A  M2GP90L6A  M2GP100L6A  M2GP112M6A  M2GP132S6A  M2GP132M6A  M2GP132M6B  M2GP160M6A  M2GP160L6A  M2GP180L6A  M2GP200L6A  M2GP200L6B  M2GP225M6A  M2GP250M6A  M2GP280S6A  M2GP280M6A  M2GP315S6A  M2GP315M6A  M2GP315L6A  M2GP315L6B  M2GP355M6A  M2GP355M6B  M2GP355L6A M2GP100L8A  M2GP100L8B  M2GP112M8A  M2GP132S8A  M2GP132M8A  M2GP160M8A  M2GP160M8B M2GP160L8A  M2GP180L8A  M2GP200L8A  M2GP225S8A  M2GP225M8A  M2GP250M8A  M2GP280S8A  M2GP280M8A  M2GP315S8A  M2GP315M8A  M2GP315L8A  M2GP315L8B

It is very important to use explosion-proof electrical devices correctly in dangerous areas. For this reason, many countries have made provisions on the structure and usage of explosion-proof electrical devices. GB 3836~2000 explosive gas environment electrical equipment standards are equivalent to the use of IEC60079, but higher than the IEC60079 standard, according to the specific situation in China, on the basis of IEC60079 plus a few key points of the original standard, formed the GB 3836 explosion-proof standards of new characteristics.

M2JAX series (80~355) flameproof motor is the most advanced factory flameproof motor (Ex d LLC) product (temperature group T1~T4) developed by Shanghai ABB motor co., LTD by introducing the latest flameproof motor manufacturing technology of ABB in the 21st century and combining the characteristics of GB 3836-2000 standard in China.

Technical features:Taken the high efficiencyThe energy efficiency of small and medium-sized three-phase asynchronous motors meets the energy efficiency limit of the national standard of the People's Republic of China.Dual bandwidth voltageThe voltage range is 220V~690V, suitable for 50Hz and 60Hz power supply.U low noiseBy optimizing electromagnetic design, ventilation condition, structure size and other technologies, M2JA series motors have lower noise.Bearing high load capacityThe motor USES deep groove ball bearing, long life, 80-132 center high motor for permanent lubrication, 160-355 with refueling device.★ good reliabilityThe motor is fully enclosed air-cooled structure with protection grade IP55. The materials and technology meet the environmental requirements. The motor has high mechanical strength, durability, rust and corrosion resistance.Winding reliability is good, F - class insulation structure, B - class assessment. And can increase the PTC thermistor or thermosensitive switch according to the user's needs.

The working conditionsAmbient air temperature varies with the season but does not exceed -15℃~40℃Sea bar: no more than 1000mFrequency ratio: 50 hz / 60 hzThe electric voltage: 220 v to 690 vWorking mode: continuous (S1)Starting mode: full voltage starting, y-delta starting or reactance startingTransmission: elastic coupling or spur gear can be used for insulation and heating: F class. However, the limit value of stator winding resistance temperature rise is 80K, that is, according to grade B (resistance method). Bearing allowable temperature not exceeding 95℃(thermometer method).Cooling method: IC411Voltage and performance parameters:M2JA series motors are designed with wide voltage, and their efficiency, power factor and speed are slightly changed under various voltage conditions.50Hz: 220-240v / 380-420v; 380 -- 420V / 660-690v, △ / ya connection.60Hz: 460V: ≤3kW, Y connection; > 3kW, delta connection.If the user needs a specific operating voltage, it can be supplied on a special request.

Flameproof motors are a kind of motors with flameproof performance. The measures adopted are: the electrical equipment cover is installed in a housing, such housing has the structure that can withstand the explosive pressure of the internal explosive mixture and can prevent the internal explosion from spreading to the surrounding explosive mixture (flameproof); Make it impossible for the live parts of the motor to produce enough sparks, arcs or dangerous temperatures to cause the danger of explosion, or to separate the live parts which may produce these phenomena from the explosive mixture, so that they cannot contact with each other or reach the degree of explosive danger (increased safety type, ventilation type, etc.). In all kinds of explosive dangerous environment, it is very important to correctly choose the explosion-proof motor with all kinds of equipment.

Explosion-proof motor for actual flame-proof motor, it has different from using the structure of the general environment, can maximize prevent motor internal external combustible gas and dust into the motor, or although enter, can also occur in its internal short circuit of the fire cases, will not fire out casing outside ignition of combustible gas and dust that exist in the surrounding environment.

Range of application

Explosion-proof motor is a kind of motor which can be used in inflammable and explosive factory. Explosion-proof motors are mainly used in coal mine, petroleum and natural gas, petrochemical and chemical industries. In addition, it is widely used in textile, metallurgy, city gas, transportation, grain and oil processing, paper making, medicine and other sectors. Explosion-proof motor as the main power equipment, usually used to drive pumps, fans, compressors and other transmission machinery.

Classification and its feature editing

Isolating type motor

It USES a flameproof enclosure to separate electrical parts that may produce sparks, arcs, and dangerous temperatures from the surrounding explosive gas mixture. However, the housing is not sealed, and the surrounding explosive gas mixture can enter the motor through the interfacial gap between the housing parts. Explosion may occur when contact with spark, arc, dangerous high temperature and other ignition sources in the enclosure. At this time, the flameproof enclosure of the motor will not be damaged or deformed, and the explosive flame or hot gas can not ignite the surrounding explosive gas mixture when it comes out through the gap of the interface.

Its main features are:

The power level, installation size and rotation speed of the corresponding relationship with DIN42673, while taking into account with the YB series

The inheritance and interchangeability of the Y2 series have been adjusted as necessary to be more effective and applicable.

The whole series USES F insulation, temperature rise by B level assessment.

The noise limit is lower than that of YB series, close to the level I noise of YB series, and the vibration limit is similar to that of YB series.

Shell protection level increased to IP55.

Low noise deep groove ball bearings are selected for the whole series. The center height of the frame is above 180mm and the motor is equipped with oil injection and discharge device.

6. There are two kinds of parallel horizontal distribution and radiation distribution of the motor heat sink, mainly to the parallel horizontal distribution.

The main performance index of liber has reached the international advanced level in the early 1990s.

Increased safety type motor

It is under normal operating conditions will not produce electric arc, spark or dangerous high temperature on the motor structure, and then take some mechanical, electrical and thermal protection measures, so as to further avoid the danger of arc, spark or high temperature under normal or approved overload conditions, so as to ensure its explosion-proof safety.

Its characteristics are:

To meet the requirements of increased safety type explosion-proof motor, take a series of reliable measures to prevent sparks, electric arc and dangerous high temperature, can safely operate in the explosion dangerous places.

The use of brushless excitation, set up a rotating rectifier panel and static excitation cabinet, excitation control system is reliable; Direct polarity slip excitation accurate, no impact; Excitation system out-of-step protection is reliable, and rewhole step ability is strong; Reasonable circuit design, the discharge resistance does not heat in the work; Wide range of excitation current regulation.

The synchronous machine, ac exciter and rotating rectifier disk coaxial. The rectifying disc is located between the main motor and exciter or outside the bearing housing.

The shell protection class is IP54.

F insulation, temperature rise according to B level assessment.

Change the traditional lower water cooling for upper water cooling, that is, the water cooler placed on the motor.

Add safety type moisture-proof heater, fixed in the cover at the bottom of the motor, used for heating moisture-proof use when stop.

Being selected high-quality raw materials, electrical and mechanical calculation left a large margin, can satisfy the operation reliability and increase safety type motor temperature requirements.

'levies set perfect monitoring measures; In the main junction box there is an enhanced self-balancing current transformer for differential protection. The embedded work of stator winding and the standby platinum thermal resistance, the dividing number is Pt100; A water leakage monitor is installed to monitor the leakage of the water cooler. Field temperature display instrument and remote signal terminal are arranged for the two - end - mount plain bearings.

Positive pressure motor

It is a positive pressure type of electrical equipment.

Its characteristics are:

To meet the requirements of increased safety type explosion-proof motor, take a series of reliable measures to prevent sparks, electric arc and dangerous high temperature, can safely operate in the explosion dangerous places.

The use of brushless excitation, set up a rotating rectifier panel and static excitation cabinet, excitation control system is reliable; Direct polarity slip excitation accurate, no impact; Excitation system out-of-step protection is reliable, and rewhole step ability is strong; Reasonable circuit design, the discharge resistance does not heat in the work; Wide range of excitation current regulation.

The synchronous machine, ac exciter and rotating rectifier disk coaxial. The rectifying disc is located between the main motor and exciter or outside the bearing housing.

The shell protection class is IP54.

F insulation, temperature rise according to B level assessment.

Change the traditional lower water cooling for upper water cooling, that is, the water cooler placed on the motor.

Add safety type moisture-proof heater, fixed in the cover at the bottom of the motor, used for heating moisture-proof use when stop.

Being selected high-quality raw materials, electrical and mechanical calculation left a large margin, can satisfy the operation reliability and increase safety type motor temperature requirements.

'levies set perfect monitoring measures; In the main junction box there is an enhanced self-balancing current transformer for differential protection. The embedded work of stator winding and the standby platinum thermal resistance, the dividing number is Pt100; A water leakage monitor is installed to monitor the leakage of the water cooler. Field temperature display instrument and remote signal terminal are arranged for the two - end - mount plain bearings.

Positive pressure motor

It is a positive pressure type of electrical equipment.

Its structural features are:

Equipped with a complete ventilation system, there is no structural dead Angle which may affect the ventilation inside the motor.

The shell and piping are made of non-combustible material with sufficient mechanical strength.

Maintain a sufficient positive pressure relative to the atmosphere in the outer shell and main pipe.

The motor shall have safety protection devices (such as time relays and flow monitors) to ensure adequate ventilation,

There must also be an automatic protection or alarm device for pressure underpressure in the shell.

The quick door or cover on the shell must be interlocked with the power supply. There is no unified positive pressure motor series in China.

Sparkless motor

Refers to under normal operating conditions, will not ignite the explosive mixture around, and generally will not occur ignition failure of the motor. Compared with increased safety type motor, in addition to the insulation dielectric strength test voltage, winding temperature rise, te (at ambient temperature reached highest rated running after the final temperature of ac winding, since started by starting current meter to temperature rise to the limit of time) and starting current than not like increased safety type has special provisions, and other aspects to add safety type motor design requirements.

Dust proof motor

It refers to the motor whose housing is designed and manufactured in accordance with the specified conditions, which can prevent dust from entering the motor housing or can not completely prevent dust from entering, but the amount of entry does not hinder the safe operation of the motor, and the accumulation of dust in the interior is not easy to cause ignition danger, and the use of the motor will not cause the explosion of the surrounding explosive dust mixture. Its characteristics are:

The shell has a high sealing, to reduce or prevent dust into the shell, even if into, the amount of its entry is not likely to form a ignition hazard.

The upper surface of the control enclosure allows the temperature not to exceed the specified temperature range. Has been used in the national grain reserves on the mechanization equipment. The national standard of dust explosion-proof electrical equipment is GBl2476.1 -- 90 explosion-proof electrical equipment for explosive dust environment.

Development trend of explosion-proof motors

Mine explosion-proof motor

(1) development of high-power motor: the world's largest installed capacity of shearer has exceeded 1200kw, its drive motor power up to 600kW; The maximum installed capacity of the corresponding mining face scraper conveyor has exceeded 1500kW, and its driving motor power has reached 725kW. The maximum power of driving motor of domestic shearer is 400kW, and that of scraper conveyor is 315kW.

The development of 3.3kv, 6kV and IOkV class voltage mine motor: this is because the popularization of comprehensive mechanized coal mining unit after the mining area to lengthen, resulting in an increase in voltage drop, while the use of high-power motor also requires an increase in voltage level.

Increased safety and non-spark motor demand will be on the rise. Petrochemical system users in the use of practice; The necessity of developing Chinese safety - enhanced and sparkless motors has been recognized. In addition, a large number of the additional safety and sparkless motors that were used in the bow [insert device] in the 1970s have come to be replaced by suitable domestic products.

The reliability of the explosion-proof motor has been increasingly concerned by petrochemical system users. The development of petrochemical enterprises is increasingly large-scale and continuous, requiring the system to operate for a long period, maintenance free or less maintenance. Therefore, the explosion-proof motor becomes the key equipment to ensure the above requirements.

(1) when the motor disintegrates, all bolts, brush frame and pad must be marked, and the explosion-proof motor must protect the explosion-proof surface.

(2) when disassembling (extracting) the motor rotor, the steel wire rope should not touch the rotor, bearing, fan, oil ring and coil; The rotor should be placed on the hard liner; Special care should be taken not to cause the rotor to touch the stator; The part where the rotor is bolted with wire rope must be lined with wood cushion.

(3) when repairing the stator, clean the ventilation ditch and coil end with compressed air. In order to avoid damage to the insulation, metal tools must not be used to remove dirt from the stator coils.

(4) when inspecting the stator core, it shall be noted whether the stator core is pressed. If the core is found to be loose, a wedge made of insulation board shall be driven into the loose place. Special attention should be paid to the slot part of the coil when checking the slot part of the stator coil. Loose and discolored groove wedges must be handled.

(5) when checking the end of the coil, check whether the insulation is damaged and the condition of the paint film. Pay attention to the end of the fixed state, found that the end has a loose place, should be added to the pad, or with a new pad and tie wire to tighten the end; If the insulation film at the coil end cracks and falls off, the insulation should be strengthened.

(6) note that there should be no debris left in the motor. The insulation resistance of the coil is measured by megohm meter.

(7) during rotor maintenance, clean the rotor with compressed air; Check the welding condition of coil, wire rod and joint; Inspect and dispose of loose and damaged wedges; Check the fan itself and its fixed condition; Check the condition of the slip ring. The surface of the slip ring should not be more than 0.5mm. Check the insulation between the rotor coil and the tie wire, and strengthen the insulation if necessary.

(8) the brush should be consistent with the slip torus. There should be a gap of 0.1 ~ 0.2mm between the brush and the brush grip. The distance between the lower edge of each brush grip and the slip ring should be 2 ~ 3mm. The pressure of the brush on the slip ring should be adjusted to the lowest pressure without spark, which is generally 0.02 ~ 0.03mpa, and the pressure of each brush must not differ by 10%. Brush frame and horizontal bar should be fastened, there is no dirt or damage between insulation liner, insulation pad and slip ring. Brush holder insulation resistance should be in more than 100 m Ω.

(9) partial or total replacement of the coil or the motor with damp should be dried. For the motor that has not been used for a long time, the insulation resistance should be measured by a shaking meter. Then, according to the measurement results, it can be determined whether the motor needs to be dried.

(10) after the motor is decomposed, remove the bearing and wash it with kerosene or gasoline. The rolling bearing should be replaced when the clearance of the bearing exceeds the allowable value.

(11) in the maintenance of the cooling system, the temperature measurement, wind blades and other ancillary equipment must be checked at the same time.

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