MT/T 767-1998Flameproof mining DC. motor (English PDF)

3.1 Type

The electric motor is a mine flameproof type.

3.2 Cooling method

Motor cooling methods are divided into air-cooled (IC410) and water-cooled (IC31W).

3.3 Degree of protection

The protection level of the motor is IP44 for the main body part and IP54 for the wiring compartment.

3.4 Quota

The motor quota is the maximum continuous quota based on the S1 working system. Special requirements can be specified separately in the product technical conditions.

3.5 Model

3.5.1 Motor product model should meet MT/T

154.1.

3.5.2 Product model composition

The product model mainly includes the type code Z for DC motors, the first feature code B for mine flameproof type, and the main parameter code for Motor output power. If it is difficult to distinguish in this way, add a second feature code and a supplementary feature code to indicate the structure distinction.

3.5.3 Arrangement of product models

3.5.4 The type code and characteristic code in the product model are indicated by Chinese pinyin letters, the main parameters are expressed by Arabic numerals, and the serial number is modified by-1 and -2 are shown in sequence (see Table 1, Table 2).

Table 1 Second feature code symbol

Second feature code QFJP (default) Product features Traction fan winch pump Other controls

Table 2 Supplementary feature code symbols

Supplementary feature code S (default) Product Features Water Cooling Other Features

3.6 Structure and installation type

Motor structure and installation type according to GB/T Regulation 997.

3.7 Rated power of the motor

The motor shall be manufactured at the following rated power.

0.25, 0.37, 0.55, 0.75, 1.1, 1.5, 2.2, 3, 4, 5.5, 7.5, 11, 15, 18.5, 22, (23) (1), (26) (1), 30,37,45,55, kW.

3.8 Rated voltage of the motor

The rated voltage of the motor is generally 110,220,250,440 V.

3.9 Motor rated speed

The rated speed of the motor is generally 3000, 1500, 1000, 750, 600, 500, 400 r/min.

3.10 Excitation method

The excitation method of the motor is divided into multiple excitation, parallel excitation or other excitation. Special requirements can be specified separately in the product technical conditions.

3.11 Tolerance of installation dimensions

Motor installation dimension tolerance should conform to GB/T 4772.1 ~ 4772.2

3.11.1 The radial runout tolerance of the motor shaft extension shall not be greater than that specified in Table 3.

(1) This level is a non-preferred number system and is not recommended

Table 3 Radial runout tolerance mm

Shaft extension nominal diameter D <= 18 18 ~ 30 30 ~ 50 50 ~ 80 80 ~ 120 120 Radial runout tolerance 0.03 0.04 0.05 0.06 0.07 0.08

3.11.2 The flange stop diameter (N) should not affect the radial circle runout of the shaft centerline and the end face runout of the flange support facing the shaft centerline vertical plane.

Greater than given in Table 4.

Table 4 Tolerance of circle runout of flange and bearing surface mm

Nominal diameter of flange stop N 50 ~ 95 95 ~ 230 230 ~ 450 450 ~ 680 Tolerance for flange runout and bearing surface 0.08 0.10 0.125 0.16

4.3.2 Allowable temperature of rolling bearing does not exceed 95

4.3.3 Motor housing temperature does not exceed 150

4.4 When the motor is under rated conditions, the spark level on its commutator is not greater than 1.5, and the spark is not greater than 2 when short-term overcurrent occurs.

4.5 Water-cooled motors shall be subjected to a water cut test. After the test, the temperature of the windings of each part of the motor shall not be greater than those given in Table 6.

Limit.

Table 6 Limit temperature of water cut test °C

Motor parts B insulation F insulation H insulation 1 winding 130 155 180 2 commutator 120 130 155

4.6 Under no-load conditions, the motor should be able to withstand 2

Min speed test without harmful deformation. The maximum speed during the test 120% of working speed.

4.7 When the excitation winding of the motor is close to the operating temperature, the voltage will be maintained from full load to no load.

Provisions.

Table 7 Motor speed adjustment rate

Converted to 1000

r/min power

Speed adjustment rate deltan <=0.67 0.67 ~ 2.5 2.5 ~ 10

4.8 When the motor is fully loaded and reaches the operating temperature, the difference between the forward and reverse rotation speeds should not be greater than the value given in Table 8.

Table 8 Motor speed difference

Converted to 1000

r/min power

Speed tolerance

<=0.67 ± 15

0.67 ~ 2.5 ± 10

2.5 ~ 10 ± 7.5

10 ± 5

4.9 When the motor is at or below the rated speed, the accidental short-time overcurrent is 1.5 times the rated current for 1 min, winding and commutator should be without damage. From the rated speed to twice the rated speed, the current does not exceed the rated value.

4.10 The thermal insulation resistance of each winding of the motor is not less than 2 Mohm, should not be lower than 5 in cold state Mohm.

4.11 When the power, voltage and speed are rated, the tolerance of the efficiency eta shall conform to GB/T Regulation 755.

Direct method. -0.15 (1-eta), the minimum is -0.07.

Indirect method. rated power at 50 kW and below is -0.15 (1-eta), rated power is 50 Above kW is -0.10 (1-eta).

4.12 The maximum effective value of the vibration speed measured at no-load of the motor shall meet the requirements of Table 9.

Table 9 Vibration limits

Mounting method. elastic mounting rigidity Rotating speed r/min Height of shaft center H mm

45 H<=132 132 H<=225 225 H<=400 H 400 600 n<=1800 1.8 mm/s 1.8 mm/s 2.8 mm/s 2.8 mm/s 1800 n<=3000 1.8 mm/s 2.8 mm/s 4.5 mm/s 2.8 mm/s

4.13 The noise limit of the A-weighted sound power level measured by the motor at no load shall not exceed the requirements of Table 10.

Table 10 Voice limits

Category I II II II I II II II I II Speed, r/min <=960 960 ~ 1320 1320 ~ 1900 1900 ~ 2360 2360 ~ 3000 Power, kW sound power level, dB (A) <=1.1 71 76 75 78 78 80 80 82 82 84 1.1 ~ 2.2 74 79 78 80 81 83 83 86 85 88 2.2 ~ 5.5 77 82 81 84 84 85 86 90 89 92 5.5 ~ 11 81 85 85 88 88 91 90 94 93 96 11 ~ 22 84 88 88 91 91 95 93 98 96 100 22 ~ 37 87 91 91 94 94 97 96 100 99 103 37 ~ 55 90 93 94 97 97 99 98 102 101 105 55 94 96 97 100 100 103 101 105 103 107 Class I. Water-cooled motor.

II. External fan cooling motor.

4.14 When the motor is no-load, it should be able to withstand a short-term elevated voltage test of 130% of the rated voltage.

Min without damage.

4.15 The withstand voltage test that the motor windings can withstand is.

2U 1000V (1)

Where.

U --- rated voltage of motor winding, V.

But the minimum is 15000 V, lasted 1 min and the insulation is not broken down. The frequency of the test voltage is 50 Hz, the waveform is as sine wave as possible.

4.16 The motor shall be subjected to an alternating humidity and heat test. After the test, the insulation resistance of each winding and commutator shall not be less than R = 1.5U (2) where.

R --- Insulation resistance of motor winding, Mohm.

For rated voltage greater than 110 ~ 220 V motor, insulation resistance should not be less than 0.33 Mohm. After the moisture resistance test Withstand voltage test of min, no breakdown or flashover shall occur. The voltage value of the withstand voltage test is 85% specified in 4.15.

4.17 The motor shall be able to withstand the withstand voltage test of the armature winding interturn insulation as specified in the relevant standards without damage.

4.18 The cable entry device of the motor shall have measures to prevent loosening and prevent cable unplugging.

3836.1 Clamping

Test and GB

The sealing performance test specified in 3836.2.

4.19 The sealing ring shall be made of rubber with a Shore hardness of 45 ~ 55 degrees, and shall be in accordance with GB After the aging test specified in 3836.1, the hardness change of the test piece measured at room temperature shall not exceed 20% of the original hardness.

Seal ring dimensions are shown in Figure 1. In order to match cables with different outer diameters, it is allowed to cut concentric grooves on the sealing ring.

4.20 Insulation bases and terminals must be able to withstand GB

The torsion test of the connector specified in 3836.1.

Have to rotate and damage.

4.21 Flameproof enclosure shall be able to withstand GB

The strength test specified in 3836.2, in which the dynamic strength test is performed by a designated inspection unit the strength test is carried out piece by piece by the manufacturer. After the test reaches the specified pressure, it shall be maintained at 1 Min, the test was done only once.

figure 1

4.22 Structural parameters of flameproof joint surface of electric motor

4.22.1 Maximum gap or diameter difference between the flameproof joint surface of the static part (see Figure 2 ~ Figure 5) and the flameproof joint surface of the flameproof insulation sleeve part W and the minimum effective length L of the flameproof joint surface, the minimum effective length L1 of the bolt through hole edge to the edge of the flameproof joint surface (see Figure 2 ~ Figure

4), the maximum diameter difference W and the minimum effective length L (see Figure 6) of the flameproof joint surface between the shaft and the shaft hole must meet the requirements of Table 11.

Figure 2 Flat

Figure 3 Flat

Figure 4 Stopper Figure 5 Stopper

Figure 6 Cylindrical

Table 11 Structural parameters of flameproof joint surface

Joint surface type

W, mm

Shell net volume, cm3 <=100 100 Flat, stop or cylindrical structure 6.0 12.5 25.0 40.0 6.0 8.0 9.0 15.0 0.30 0.40 0.50 0.40 0.50 0.60 with rolling bearing Cylindrical structure 6.0 12.5 25.0 40.0 0.40 0.50 0.60 0.40 0.50 0.60 0.80

4.22.2 The flameproof joint surface of the shaft and hole of the motor shall meet the following requirements.

a) The flameproof joint surface of the motor shaft and shaft hole should not cause friction under normal working conditions;

b) The minimum unilateral air gap K (see Figure 7) of the rotation shaft and shaft hole of the cylinder flameproof joint surface must be greater than 0.075 mm;

K-minimum unilateral clearance; m-maximum unilateral clearance; Dd-diameter difference

Figure 7

c) For the rolling bearing structure, the maximum unilateral clearance m (see Figure 7) between the shaft and the hole must not be greater than 2/3 of the W value specified in Table 11.

4.22.3 The flameproof structure of the thread of the motor shall meet the following requirements.

a) Thread accuracy should not be less than 6 H or 6 g, pitch should not be less than 0.7 mm;

b) The minimum number of meshing buckles and the minimum screwing depth of the threads must meet the requirements of Table 12;

Table 12 Thread penetration depth

Shell net volume

cm3 minimum screwing depth mm Minimum engagement buckle 0 ~ 100 5.0 100 ~.2000 9.0 2000 12.5

c) The thread structure must have measures to prevent it from loosening.

4.22.4 The roughness Ra of the flameproof joint surface is 6.3 µm, but the roughness of the axis Ra is 3.2 µm.

4.22.5 Explosion-proof joints shall have anti-rust measures, such as electroplating, phosphating, and coating with.201 1 anti-rust oil.

4.23 The electrical clearance and creepage distance of the junction box are in accordance with the requirements of Table 13 and Table 14. Depth (or height) of grooves and ribs on insulating surfaces, Width is not less than 3.0 for mm, the creepage distance can be calculated according to the length of the outer surface of the insulator.

4.24 For water-cooled electric motors, the water channel shall be able to withstand the hydrostatic test without cracks, deformation and leakage.

4.25 The degree of protection of the motor casing and terminal box shall meet the requirements of 3.3.

4.26 The tolerance of the installation dimension parameters of the motor shall meet the requirements of 3.11.

Table 13 Clearance

Rated voltage, V minimum clearance, mm

Table 14 Creepage distance

Rated voltage

Minimum creepage distance, mm Compared with the tracking index classification, CTI 600<=CTI (I) 400<=CTI<=600 (II) 175<=CTI<=400 (IIIa) Note.

See Appendix A for the classification of the tracking index of common insulating materials compared to the tracking index.

5.1 Motor temperature rise test according to GB/T

The provisions of Chapter 11 of 1311-1989 are carried out.

5.2 Inspection of the commutation performance of the motor shall be in accordance with GB/T

1311-1989 Chapter 10.

5.3 When doing a water cut test for a water-cooled motor, first run the motor to a thermally stable state and temporarily cut off the water.10 min (there is standing water in the watercourse), which the results shall meet the requirements of 4.5.

5.4 Motor armature overspeed test according to GB/T

The provisions of Chapter 19 of 1311-1989 were carried out.

5.5 Measurement of motor speed adjustment rate according to GB/T

1311-1989 Chapter 15

5.6 The difference between the forward and reverse rotation speed of the motor is measured in accordance with GB/T the provisions of Chapter 15 of 1311-1989 are carried out.

5.7 Short-term over-current test of electric motor according to GB/T

The provisions of Chapter 13 of 1311-1989 are carried out.

5.8 Insulation resistance measurement of hot and cold states of motor windings in accordance with GB/T 1311-1989, Chapter 4.

5.9 Motor efficiency according to GB/T

The provisions of Chapter 12 of 1311-1989 were carried out.

5.10 Motor vibration test according to GB/T

Related provisions in 10068.1.

5.11 Short-term elevated high-voltage test of electric motors per GB/T

1311-1989 Chapter 24.

5.12 Withstand voltage test of electric motor according to GB/T

1311-1989 Chapter 25.

5.13 Alternating Humidity and Heat Test of Motor According to GB/T

Related provisions in 2423.4. Test maximum temperature 40 °C, test cycle 12 d.

5.14 The interturn test of the armature winding of the motor shall be carried out in accordance with the relevant regulations.

5.15 The clamping test of the motor cable lead-in device is in accordance with GB 3836.1-1983 stipulated in 14.2.10.

5.16 The sealing performance test of the motor cable lead-in device is in accordance with GB 3836.2-1983 stipulated in 21.1.

5.17 Rubber material aging test of motor seal ring according to GB

3836.1-1983 Chapter 29 provides for this.

5.18 Torsion test of connecting parts of electric motors according to GB

3836.1-1983 stipulated in 11.1.

5.19 Static strength test of electric motor according to GB

3836.2-1983 stipulated in 19.2.3 and Appendix A.

5.20 Dynamic strength test of electric motor according to GB

3836.2-1983 stipulated in 19.2.2.

5.21 The test pressure for the water pressure hydraulic test of the water-cooled motor casing is 4.5 MPa, maintain 1 min, the result should meet 4.24 Claim.

6.1 Inspection classification

Motor inspection is divided into factory inspection and type inspection.

6.1.1 The factory inspection items and type inspection items of the motor shall be carried out in accordance with the provisions of Table 15.

6.1.2 Each motor must be inspected at the factory.

6.1.3 The motor must undergo type inspection in any of the following situations.

a) When the product trial production is completed;

b) when changes in the design, process or materials of the motor are sufficient to cause changes in certain characteristics and parameters;

c) When the results of the factory inspection and the previous type inspection results are not allowed to deviate;

d) Motors produced in batches should be type-tested every two years;

c) when re-production or re-production after long-term suspension;

f) When a national quality supervision agency requests a type inspection.

6.2 Inspection items

Motor inspection items are shown in Table 15.

Table 15 Inspection items

Inspection item quality characteristics identification technical requirements test method factory inspection type inspection Bearing and motor surface quality inspection and rotation inspection C 4.1-sqrt1) sqrt Measurement of cold state insulation resistance between windings to casing and windings B 4.10 5.8 sqrt sqrt Measurement of DC resistance of windings under actual cold conditions C 4.1 GB/T 1311 sqrt sqrt Withstand voltage test B 4.15 5.12 sqrt sqrt Short-term elevated voltage or inter-chip interturn impact test B 4.14, 4.17 5.11, 5.14 sqrt sqrt Vibration test A 4.12 5.10 sqrt sqrt Determination of no-load characteristics C 4.1 GB/T 1311 sqrt sqrt Load rating test and check commutation A 4.4 5.2 sqrt sqrt Short-time overcurrent test (check commutation at the same time) B 4.4,4.9 5.7 sqrt sqrt Measurement of speed adjustment rate and speed difference B 4.7,4.8 5.5,5.6 sqrt sqrt Armature overspeed test A 4.6 5.4 sqrt sqrt Examination of size gap and roughness of flameproof surface A 4.22, 4.23-sqrt sqrt Shell static strength test A 4.21 5.19 sqrt sqrt Casing water pressure test 2) A 4.24 5.21 sqrt sqrt Temperature rise test 3) A 4.3 5.1-sqrt Water cut test 2) B 4.5 5.3-sqrt Determination of non-sparking commutation area C 4.1 GB/T 1311-sqrt Efficiency measurement B 4.11 5.9-sqrt Determination of speed characteristics C 4.1 GB/T 1311-sqrt Measurement of thermal insulation resistance between windings to casing and windings A 4.10 5.8-sqrt Noise measurement B 4.13 GB/T 10069.1 sqrt sqrt Determination of moment of inertia 4) C 4.1 GB/T 1311-sqrt Alternating wet and hot test face 4) A 4.16 5.13-sqrt Installation dimensions and overall dimensions inspection B 4.1, 4.26-sqrt sqrt Shell protection level test 4) A 4.25 GB/T 4942.1-sqrt

Table 15 (continued)

Inspection item quality characteristics identification technical requirements test method factory inspection type inspection Torsion test of connector 4) A 4.20 5.18-sqrt Lead-in device clamping test, sealing performance test 4) A 4.18 5.15, 5.16-sqrt Aging test of rubber material 4) A 4.19 5.17-sqrt Flameproof performance test 4) A 4.21 5.20-sqrt

1) Items to be inspected.

2) Inspection items for water-cooled motors only.

3) The water-cooled motor is based on the inlet water temperature.

4) Only when the motor is finalized or when requested by the relevant inspection department.

6.3 Lot rules and sampling plans

When the batch is larger than 20 sets, the sampling plan should adopt GB/T Relevant provisions of 2829, unless otherwise determined by other standards. Generally choose one the sub-sampling plan, the discrimination level I, the unqualified quality level is not greater than 50. When the batch is less than or equal to 20 sets, the number of type inspection samples is 2, and it is not necessary to batch rules according to this group.

The inspection is required against the inspection items, and the number of unqualified and unqualified products is accumulated, and the product is judged as qualified or unqualified according to the sampling plan. If Unqualified, should be GB/T 2829-1987 deal with the provisions of 4.12.3.

6.4 Sampling

Motors used for type inspection shall be selected from products that pass the factory inspection, and the number of test samples shall not be less than two.

6.5 Judgment and Reexamination Rules

During type inspection, all indicators should meet the requirements of product standards. Any one of the tests failed, if it is a trial new product, it should be identified...