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M3JP series explosion-proof motors IE2 IE3 IE4

M3JP80MA2

M3JP80MB2

M3JP90SLA2

M3JP90SLC2

M3JP100LA2

M3JP112MB2

M3JP132SMB2

M3JP132SMD2

M3JP160MLA2

M3JP160MLB2

M3JP160MLC2

M3JP180MLA2

M3JP200MLA2

M3JP200MLC2

M3JP225SMB2

M3JP250SMA2

M3JP280SMA2

M3JP280SMB2

M3JP315SMA2

M3JP315SMB2

M3JP315SMC2

M3JP315MLA2

M3JP355SMA2

M3JP355SMB2

M3JP355SMC2

M3JP355MLA2

M3JP355MLB2

M3JP355LKA2

M3JP400LA2

M3JP400LKA2

M3JP400LB2

M3JP400LKB2

M3JP400LC2

M3JP400LKC2

M3JP132SME2

M3JP160MLD2

M3JP180MLB2

M3JP180MLC2

M3JP200MLE2

M3JP225SMC2

M3JP225SMD2

M3JP250SMB2

M3JP250SMC2

M3JP280SMC2

M3JP80MA4

M3JP80MB4

M3JP90SLA4

M3JP90SLC4

M3JP100LA4

M3JP100LB4

M3JP112MC4

M3JP132SMB4

M3JP132SMD4

M3JP160MLC4

M3JP160MLE4

M3JP180MLA4

M3JP180MLB4

M3JP200MLB4

M3JP225SMB4

M3JP225SMC4

M3JP250SMA4

M3JP280SMA4

M3JP280SMB4

M3JP315SMA4

M3JP315SMB4

M3JP315SMC4

M3JP315MLA4

M3JP355SMA4

M3JP355SMB4

M3JP355SMC4

M3JP355MLA4

M3JP355MLB4

M3JP355LKA4

M3JP400LA4

M3JP400LKA4

M3JP400LB4

M3JP400LKB4

M3JP400LC4

M3JP400LKC4

M3JP132SME4

M3JP160MLF4

M3JP160MLG4

M3JP180MLC4

M3JP200MLC4

M3JP225SMD4

M3JP225SME4

M3JP250SMB4

M3JP250SMC4

M3JP280SMC4

M3JP80MA6

M3JP80MB6

M3JP90SLA6

M3JP90SLC6

M3JP100LA6

M3JP112MB6

M3JP132SMB6

M3JP132SMC6

M3JP132SMD6

M3JP160MLA6

M3JP160MLB6

M3JP180MLB6

M3JP200MLA6

M3JP200MLB6

M3JP225SMB6

M3JP250SMA6

M3JP280SMA6

M3JP280SMB6

M3JP315SMA6

M3JP315SMB6

M3JP315SMC6

M3JP315MLA6

M3JP355SMA6

M3JP355SMB6

M3JP355SMC6

M3JP355MLB6

M3JP355LKA6

M3JP400LA6

M3JP400LKA6

M3JP400LB6

M3JP400LKB6

M3JP400LC6

M3JP400LKC6

M3JP400LD6

M3JP400LKD6

M3JP450LA6

M3JP160MLC6

M3JP180MLC6

M3JP200MLC6

M3JP225SMC6

M3JP250SMB6

M3JP280SMC6

M3JP80MA8

M3JP80MB8

M3JP90SLA8

M3JP90SLC8

M3JP100LA8

M3JP100LB8

M3JP112MC8

M3JP132SMC8

M3JP132SMD8

M3JP160MLA8

M3JP160MLB8

M3JP160MLC8

M3JP180MLB8

M3JP200MLA8

M3JP225SMA8

M3JP225SMB8

M3JP250SMA8

M3JP280SMA8

M3JP280SMB8

M3JP315SMA8

M3JP315SMB8

M3JP315SMC8

M3JP315MLA8

M3JP355SMA8

M3JP355SMB8

M3JP355SMC8

M3JP355MLB8

M3JP400LA8

M3JP400LKA8

M3JP400LB8

M3JP400LKB8

M3JP400LC8

M3JP400LKC8

M3JP450LA8

M3JP450LB8

M3JP450LC8

M3JP450LD8

M3JP200MLB8

M3JP225SMC8

M3JP250SMB8

M3JP280SMC8

M3JP160MLA10

M3JP160MLB10

M3JP160MLC10

M3JP180MLB10

M3JP200MLA10

M3JP200MLB10

M3JP225SMB10

M3JP225SMC10

M3JP250SMB10

M3JP280SMB10

M3JP280SMC10

M3JP315SMB10

M3JP315SMC10

M3JP315MLA10

M3JP355SMA10

M3JP355SMB10

M3JP355SMC10

M3JP355MLB10

M3JP400LB10

M3JP400LKB10

M3JP400LC10

M3JP450LB10

M3JP400LKC10

M3JP450LC10

M3JP450LD10

M3JP160MLB12

M3JP160MLC12

M3JP160MLD12

M3JP180MLB12

M3JP200MLA12

M3JP200MLB12

M3JP225SMB12

M3JP225SMC12

M3JP250SMB12

M3JP280SMB12

M3JP280SMC12

M3JP315SMB12

M3JP315SMC12

M3JP315MLA12

M3JP355SMA12

M3JP355SMB12

M3JP355SMC12

M3JP355MLB12

M3JP400LB12

M3JP400LKB12

M3JP400LC12

M3JP400LKC12

M3JP450LD12

M3JP280SMB2/4

M3JP315SMC2/4

M3JP315MLA2/4

M3JP355SMA2/4

M3JP355MLA2/4

M3JP112MB2-4

M3JP132SMD2-4

M3JP160MLC2-4

M3JP180MLB2-4

M3JP200MLE2-4

M3JP225SMC2-4

M3JP250SMC2-4

M3JP355SMB2-4

M3JP355MLA2-4

M3JP355LKA2-4

M3JP355MLA2/4

M3JP132SMD2-4

M3JP180MLB2-4

M3JP355MLB2-4

M3JP355LKB2-4

M3JP355SMA4/6

M3JP355MLB4/6

M3JP355SMA4/6

M3JP315SMB4/8

M3JP315SMC4/8

M3JP355SMC4/8

M3JP355MLB4/8

M3JP112MC4-8

M3JP132SMD4-8

M3JP355SMC4-8

M3JP315SMB4/8

M3JP315MLA4/8

M3JP355SMC4/8

M3JP100LB4-8

M3JP132SMD4-8

M3JP355MLB4-8

M3JP315SMC6/8

M3JP355SMC6/8

M3JP355MLB6/8

M3JP355LKB6/8

M3JP315SMC6/8

M3JP315MLA6/8

M3JP355SMB6/8

M3JP355SMC6/8

M3JP355MLB6/8

M3JP355LKB6/8

M3KP80MA2

M3KP80MB2

M3KP90SLA2

M3KP90SLC2

M3KP100LA2

M3KP112MB2

M3KP132SMB2

M3KP132SMD2

M3KP160MLA2

M3KP160MLB2

M3KP160MLC2

M3KP180MLA2

M3KP200MLA2

M3KP200MLC2

M3KP225SMB2

M3KP250SMA2

M3KP280SMA2

M3KP280SMB2

M3KP315SMA2

M3KP315SMB2

M3KP315SMC2

M3KP315MLA2

M3KP355SMA2

M3KP355SMB2

M3KP355SMC2

M3KP355MLA2

M3KP355MLB2

M3KP355LKA2

M3KP400LA2

M3KP400LKA2

M3KP400LB2

M3KP400LKB2

M3KP400LC2

M3KP400LKC2

M3KP132SME2

M3KP160MLD2

M3KP180MLB2

M3KP180MLC2

M3KP200MLE2

M3KP225SMC2

M3KP225SMD2

M3KP250SMB2

M3KP250SMC2

M3KP280SMC2

M3KP80MA4

M3KP80MB4

M3KP90SLA4

M3KP90SLC4

M3KP100LA4

M3KP100LB4

M3KP112MC4

M3KP132SMB4

M3KP132SMD4

M3KP160MLC4

M3KP160MLE4

M3KP180MLA4

M3KP180MLB4

M3KP200MLB4

M3KP225SMB4

M3KP225SMC4

M3KP250SMA4

M3KP280SMA4

M3KP280SMB4

M3KP315SMA4

M3KP315SMB4

M3KP315SMC4

M3KP315MLA4

M3KP355SMA4

M3KP355SMB4

M3KP355SMC4

M3KP355MLA4

M3KP355MLB4

M3KP355LKA4

M3KP400LA4

M3KP400LKA4

M3KP400LB4

M3KP400LKB4

M3KP400LC4

M3KP400LKC4

M3KP450LA4

M3KP450LB4

M3KP450LC4

M3KP132SME4

M3KP160MLF4

M3KP160MLG4

M3KP180MLC4

M3KP200MLC4

M3KP225SMD4

M3KP225SME4

M3KP250SMB4

M3KP250SMC4

M3KP280SMC4

M3KP80MA6

M3KP80MB6

M3KP90SLA6

M3KP90SLC6

M3KP100LA6

M3KP112MB6

M3KP132SMB6

M3KP132SMC6

M3KP132SMD6

M3KP160MLA6

M3KP160MLB6

M3KP180MLB6

M3KP200MLA6

M3KP200MLB6

M3KP225SMB6

M3KP250SMA6

M3KP280SMA6

M3KP280SMB6

M3KP315SMA6

M3KP315SMB6

M3KP315SMC6

M3KP315MLA6

M3KP355SMA6

M3KP355SMB6

M3KP355SMC6

M3KP355MLB6

M3KP355LKA6

M3KP400LA6

M3KP400LKA6

M3KP400LB6

M3KP400LKB6

M3KP400LC6

M3KP400LKC6

M3KP400LD6

M3KP400LKD6

M3KP450LA6

M3KP450LB6

M3KP450LC6

M3KP160MLC6

M3KP180MLC6

M3KP200MLC6

M3KP225SMC6

M3KP250SMB6

M3KP280SMC6

M3KP80MA8

M3KP80MB8

M3KP90SLA8

M3KP90SLC8

M3KP100LA8

M3KP100LB8

M3KP112MC8

M3KP132SMC8

M3KP132SMD8

M3KP160MLA8

M3KP160MLB8

M3KP160MLC8

M3KP180MLB8

M3KP200MLA8

M3KP225SMA8

M3KP225SMB8

M3KP250SMA8

M3KP280SMA8

M3KP280SMB8

M3KP315SMA8

M3KP315SMB8

M3KP315SMC8

M3KP315MLA8

M3KP355SMA8

M3KP355SMB8

M3KP355SMC8

M3KP355MLB8

M3KP400LA8

M3KP400LKA8

M3KP400LB8

M3KP400LKB8

M3KP400LC8

M3KP400LKC8

M3KP450LA8

M3KP450LB8

M3KP450LC8

M3KP450LD8

M3KP200MLB8

M3KP225SMC8

M3KP250SMB8

M3KP280SMC8

M3KP160MLA10

M3KP160MLB10

M3KP160MLC10

M3KP180MLB10

M3KP200MLA10

M3KP200MLB10

M3KP225SMB10

M3KP225SMC10

M3KP250SMB10

M3KP280SMB10

M3KP280SMC10

M3KP315SMB10

M3KP315SMC10

M3KP315MLA10

M3KP355SMA10

M3KP355SMB10

M3KP355SMC10

M3KP355MLB10

M3KP400LB10

M3KP400LKB10

M3KP400LC10

M3KP450LB10

M3KP400LKC10

M3KP450LC10

M3KP450LD10

M3KP160MLB12

M3KP160MLC12

M3KP160MLD12

M3KP180MLB12

M3KP200MLA12

M3KP200MLB12

M3KP225SMB12

M3KP225SMC12

M3KP250SMB12

M3KP280SMB12

M3KP280SMC12

M3KP315SMB12

M3KP315SMC12

M3KP315MLA12

M3KP355SMA12

M3KP355SMB12

M3KP355SMC12

M3KP355MLB12

M3KP400LB12

M3KP400LKB12

M3KP400LC12

M3KP400LKC12

M3KP450LD12

M3KP315SMC2/4

M3KP315MLA2/4

M3KP355SMA2/4

M3KP355MLA2/4

M3KP112MB2-4

M3KP132SMD2-4

M3KP160MLC2-4

M3KP180MLB2-4

M3KP200MLE2-4

M3KP225SMC2-4

M3KP250SMC2-4

M3KP355SMB2-4

M3KP355MLA2-4

M3KP355MLA2/4

M3KP132SMD2-4

M3KP180MLB2-4

M3KP355MLB2-4

M3KP355LKB2-4

M3KP355MLB4/6

M3KP355SMA4/6

M3KP315SMC4/8

M3KP355SMC4/8

M3KP355MLB4/8

M3KP112MC4-8

M3KP132SMD4-8

M3KP355SMC4-8

M3KP280SMB4/8

M3KP315SMB4/8

M3KP315MLA4/8

M3KP355SMC4/8

M3KP100LB4-8

M3KP132SMD4-8

M3KP280SMB4-8

M3KP355MLB4-8

M3KP315SMC6/8

M3KP355SMC6/8

M3KP355MLB6/8

M3KP355LKB6/8

M3KP315SMC6/8

M3KP315MLA6/8

M3KP355SMB6/8

M3KP355SMC6/8

M3KP355MLB6/8

M3KP355LKB6/8


Protection level Gb for devices in zones 1 and 2
 
 Low voltage explosion-proof machine

 

ABB provides a full range of IECEx/ATEX certified low-voltage explosion-proof IE2 motors that meet IEC 60034-30-1 (2014) requirements. Low voltage explosion-proof motors are designed to meet the specific needs of each customer and each application.

 

Output power 0.55-950 kW

Model IEC 80-450

2 minus 8

Voltage grade all common voltages

The frequency is 50 or 60 Hz

Protection level IP 55 or higher

Protection type for zone 1 or 2

Temperature grade t1-t6

Gas groups IIB and IIC

IECEx/ATEX certification, equipment protection level (EPLs), national certification such as cu-tr (Russia, belarus and kazakhstan), CQST (China) and Inmetro (Brazil)

features

It can be used in combination with inverter

Variable design can be provided for different standards of oil and gas industry

Obtain type approval of most classification societies

Provides application-specific design

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 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.

In order to meet the needs of coal mine conveyor starting at low speed and running at high speed, coal mine scraper conveyors abroad are driven by two-speed motor. However, compared with the advanced level of foreign countries, there is a certain gap in the power range, performance index and performance of auxiliary control switch of domestic mine two-speed motor.

In order to improve the reliability of mine motor: mine explosion-proof motor operating conditions are poor, the motor frequently large load starting, load changes, voltage fluctuations, high ambient temperature and a certain degree of corrosion, and so on, which affect the use of the reliability and life of the motor.

Accelerate the replacement of mine explosion-proof motor.

Unified mine explosion-proof motor standards.

Explosion-proof motor for petrochemical system

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.

Explosion-proof and high efficiency variable frequency speed regulating motors have become energy saving products urgently required by petrochemical users. In recent years, series of YBx and YAX explosion-proof efficient motors have been produced, which are very popular among users after being put into the market. Energy saving of explosion-proof motor has two aspects: one is to develop high efficiency explosion-proof motor products, the other is to develop a large number of explosion-proof speed regulating motor products, especially the fan, pump and compressor with great potential for energy saving motor design for speed regulating motor.

The development of coastal petrochemical enterprises brings new requirements. A number of refineries will be built along the coast of China. The crude oil will need to be imported, and the imported crude oil is of high sulfur content and serious corrosion. In addition, the imported crude oil needs to be transported by sea, and its storage tank needs the explosion-proof motor with high head and large flow oil pump.

The great development of petroleum industry in western China requires the development of explosion-proof motor products suitable for dry and hot desert environment. The market demand for large capacity incremental brushless excitation synchronous machines (brushless excitation synchronous machines) for hydrogenation units will increase year by year.

Maintenance editor of explosion-proof motor

(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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