JB/T 2657.1-1999 Technical requirements for DI-150, SS-150, DI-153, SS-153 contact synchros
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T2657.1
DI-150 SS-150 DI-153 SS-153 1999-08-06
Wa Xian Ji Dong
2000-01-01
JB/T2657.11999
This standard is a revision of JB2657-80 "DI-150, DI-153, SS-150, SS-153 contact type self-aligning machine".
During the revision, in addition to the editorial modification of the original standard, the main modifications are as follows: 1 According to the national standard, some terms with the same name are modified accordingly; the technical requirements of winding diagram and exciting friction torque are deleted; 2
3 The contents that do not belong to the technical conditions of the product, such as "bearings should be coated with good anti-rust lubricating grease", are deleted; 4 For items such as low temperature and impact vibration test, which only have test methods but no corresponding technical requirements, they are improved; 5 For the test method of measuring rated data such as exciting current in hot state, it is improved. From the date of implementation of this standard, it will replace JB2657-80. This standard is proposed by the National Microcomputer Standardization Technical Committee and is under the jurisdiction of this standard. Drafting unit: Shanghai Shangwei Jinyu Motor Co., Ltd. Company. The main drafters of this standard: Chen Enci, Chen Bafen. This standard was first issued in July 1980.
JB/T2657.11999
JB26571980
This standard specifies the classification, requirements, test methods, inspection rules, marking, packaging, transportation, storage and other requirements of DI-150, DI-153, SS-150, SS-153 contact type angle adjustment machines. This standard applies to DI-150, DI-153, SS-150, SS-153 with a frequency of 500Hz. Type of contact self-synchronous angle machine. 2 Classification
DI-150 and DI-153 are self-synchronous angle transmitters, and SS-150 and SS-153 are self-synchronous angle receivers. The stators of the four types of synchro machines of this type all have three-phase step windings, and their output lines are marked with TI, T2 and T3; the rotors have single-phase excitation windings, and their output lines are marked with L1 and L2. In addition, the rotors of DI-150 and SS-50 also have internally short-circuited damping windings. TI, T2, T3 and L1, L2 can have reserved marks St, S2, S3 and R1, R2, respectively. In the knife-torque synchro machine system, DI-150, DI-153 self-synchronous angle transmitters and SS-150, SS-153 The synchro receiver is wired as shown in the figure.
White synchro transmitter
Synchro receiver
Figure 1 Torque synchro system
3 Requirements
3.1 Environmental conditions for use
This type of synchro is allowed to work under the following conditions, and its performance should meet the requirements of this standard: a) Air temperature: -40~+40%; b) Accuracy: 92%~98% at 20±5℃; c) Vibration: Double amplitude 1mm, frequency IDHz: 1999-08-06
2000-01-01
JB/T2657.1
d) Shock: Frequency 1.33 Hz, acceleration 70 m/s23.2 Rated data
The rated data of the synchro motor shall conform to the values listed in Table 1. 1999
Table 1 Rated data
DJ—150
SS—150
DI--153
SS—153
Magnetic current
Not more than
Magnetic power
Not more than
Jiang: The magnetic power value is for reference only and is not checked during the inspection. 3.3
Outside quality
Maximum output
47 ± 2
47 ± 2
47 ± 2
Maximum output
Output pressure difference
Maximum step
rnN: m
The counter of the self-synchronous machine should be free of rust and mechanical damage, and the fasteners should be tight and sealed with enamel. Damping time
Not more than
Determine the standard of the transmission number of the receiving machine
Transmitter
DI-—I50
DI-153
3.3.2Except the shaft end, all the counters of the self-synchronous machine must have a strong coating to prevent rust and moisture. The shaft extension end should be coated with anti-rust oil. 3.3.3 The writing and content on the line board and nameplate should be clear and unreadable, and should not fall off. 3.4 Overall dimensions and installation dimensions
The overall dimensions and installation dimensions of the angle machine should meet the requirements of Figure 2 and Figure 3. 3—53.2
@52=8:1
0. 56 ~2. 95
8. 92~~10. 47
3.75-4.18
75. 59 ~ 77. 3
Dimension unit: mm
Figure 2 DI—150, DI—153 appearance and installation dimensions3.5 Radial runout
JB/T2657.1
018-88
h7.9219-54
3. 75~4. 1E
70.49-72-25
Size 1Unit: mm
Figure 3 SS-150, SS-153 appearance and installation dimensions 3.5.1 The radial runout of the outer circle of the housing to the rotor axis should not exceed 0.09mml, 3.5.2
The radial runout of the shaft extension end to the rotating axis should not exceed 0.02mm. 3.5.3 The radial runout of the outer circle of the rotating ring to the rotating axis should not exceed 0.05Ⅱm. 3.6 Flange end face runout
The end face runout of the flange end face to the rotor axis at the installation fit of the self-synchronous machine should not exceed 0.151mm, 3.7wwW.bzxz.Net
Axial clearance
The axial clearance of the self-synchronous machine should be within the range of 0.06--0.15mm. 3.8 Excitation static friction torque
The excitation static friction torque of DI-150 and DI-153 should not be greater than 1.37mN·m; the excitation static friction torque of SS-150 and SS-153 should not be greater than 0.343mN·m
3.9 Contact reliability
When the rotor of the synchro rotates, the contact between the brush and the collector ring should be reliable. 3.10 DC resistance
The DC resistance of the synchro winding should meet the value specified in the product drawing. 3.11 Insulation resistance
The insulation resistance between the conductive part of the synchro and the casing and between the conductive parts shall be: a) not less than 100M2 when the ambient temperature is 20+5°C and the relative humidity is 60%~70%; b) not less than 50M2 when the temperature rise is stable:
c) Place the synchro in an environment with a temperature of 20±5° and a relative humidity of 92%-98%, take it out after 20 days, and place it for 25 mi1, measured within 5min, not less than MΩ: then apply rated voltage to the exciting winding, measure immediately after 6h±15min, not less than 5M2,
3.12 Insulation dielectric strength
The conductive part of the motor should be able to withstand the insulation of the casing: JB/T2657.1
a) Under normal conditions, withstand a 50Hz, 1000V sinusoidal voltage for 1min without breakdown (this test shall not be repeated more than once, and the test voltage during the retest is 750V); the insulation resistance after the test shall not Less than 100M11; b) When the ambient temperature is 40±2%, the synchro motor withstands a 50Hz, 750V positive wave voltage for 1min without breakdown when the temperature rises steadily:
3.13 Rotating plate
When the angle transmitter, synchro receiver and the standard transmitter of Table 1 are connected according to Figure 1 (for the synchro transmitter, it is connected with the standard transmitter of the same model), the rotation direction of the two should be the same when viewed from the shaft end: 3.14 Accuracy
The accuracy level of the synchro transmitter is divided according to the zero position error. The synchro receiver is evaluated according to its static error, see Table 2. 2. Error and accuracy level
DI-150, DI-153
$5150. S5-153
3.15 Damping time
Error name
Position error
Static error
Maximum average error
>0.25-0.5
No level division. But it shall not be greater than 2.5
When SS-150 and DI-150 are adjusted from 177°±2° to coordination, the SS-150 time should meet the requirements of 32: 3.16 Temperature rise
When the excitation voltage increases by 5% of the rated value, the winding temperature rise during long-term operation shall not exceed 60K. 3.17 Excitation current, micro-magnetic power and maximum output voltage in hot state When the ambient temperature is 40±2°, the excitation current, micro-magnetic power, maximum output medium voltage and their values of the synchrotron should still meet the requirements of 1.
3.18 Changes in voltage and frequency
When the grid voltage differs from the rated value by ±5% and the frequency differs from the rated value by 3%, the synchrotron receiver should be able to work normally, and the static error at this time should not exceed 2.5°.
3.19 Dynamic error
When the transmitter rotates at a constant speed of 60T/mi, the dynamic error of the full-angle receiver should not be greater than 7°; when driven by a sine wave with an amplitude of 720° and a period of 6s, it should not be less than 10°3. Low temperature
When the full-angle receiver is placed at a temperature of -40±2 for 21 days, the contact between the brush and the collector should be reliable and must not be out of synchronization and enter asynchronous operation.
3.21 Shock and vibration
The synchro should be free of mechanical damage, loose fasteners and loss of synchronization under the following test conditions: a) Under the vibration condition of 10Hz frequency and double amplitude of 1±0.2mm, for 21min; b) Under the condition of impact acceleration of 70m/s2 and impact frequency of 1.33Hz, for 10min. 3.22 Noise
The noise of the synchro should not be greater than 60dB. 4
3.23 Life
JB/T2657.11999
When the speed of the synchro is 10r/min, the contact between the brush and the collector ring should remain reliable during the 1500h operation of the synchro transmitter and receiver in pairs.
3.24 Weight
The weight of D1-[50, DI--153 shall not exceed 0.28kg. The weight of SS-150, SS--153 shall not exceed 0.19kg=4 Test Method
4.1 Test Conditions
4.1.1 Climate Conditions
All tests shall be conducted under the following climate conditions unless otherwise specified:8) Ambient temperature: 20+5°C:
b) Relative humidity: 60%~70%;
c) Atmospheric pressure: 96~104kPa.
4.1.2 Test Power Supply
The voltage amplitude and frequency difference and voltage waveform accuracy are specified as follows: a) Voltage: ±2% of the rated value;
b) Frequency: 2% of the rated value;
c) Voltage waveform: Sine wave waveform distortion is not more than 5%. 4.1.3 Electrical measuring instruments
The accuracy of electrical measuring instruments shall not be lower than Class 1. 4.1.4 Installation method of the tested synchro
The tested synchro shall be installed horizontally unless otherwise specified. 4.2 Appearance quality
The appearance quality of the daily inspection synchro shall comply with the provisions of 3.3. 4.3 Overall dimensions and installation dimensions
Use measuring instruments or special gauges that can ensure that the dimensional accuracy requirements of the product drawings are met to check the overall dimensions and installation dimensions of the synchro, which shall comply with the provisions of 3.4.
4.4 Radial runout and flange end face runout4.4.1 Set the synchro shaft, rotate the stator, and use a dial indicator to measure the radial runout of the outer circle of the housing and the flange end face runout at the installation fit. Measure each for 3 times, and the average value shall comply with the provisions of 3.5.1 and 3.6. 4.4.2 Fix the stator of the synchro machine. When the shaft is rotating, use a dial indicator to measure the radial runout at different locations of the shaft extension and the collector ring. Measure 3 times each. The average value should meet the requirements of 3.5.2 and 3.5.3. 4.5 Axial clearance
Fix the synchro machine on a special device and apply two axial thrusts in opposite directions to the shaft (or housing) in sequence. The magnitude of the thrust is 30N. Under the action of the thrust, the shaft (or housing) moves repeatedly along the axis. The movement value is the axial clearance. Measure 3 times in total. The average value should meet the requirements of 3.7.
4.6 Excitation static friction torque
JB/T2657.1
A fixed voltage is applied to the synchro, and a pulley with a diameter of 2~5cn is fixed at the end of the shaft. The load (base weight) is hung on the pulley with a thin wire, and the weight
Where: M—excitation static friction torque allowed by 3.8, mN·Im; R—pulley radius, cm.
Driven by the base weight, the synchro is rotated 2-3 times in both directions of the anti-reverse direction at a speed of 2~3r/min. If there is no stop phenomenon, it is considered to meet the requirements of 3.8.
4.7 Contact reliability
Connect the terminals L and Ls with 2V voltage according to the circuit in Figure 4, and check through the milliammeter and the additional resistor to ensure the scale reading of the meter. If the reading shown by the milliammeter pointer is stable, or the pointer offset is not less than 20% of the average reading obtained by the self-synchronous machine at a speed of one turn per minute, it is considered to meet the requirements of 3.9. 2V
Figure 4 Wiring diagram for checking contact reliability
4.8 DC resistance
The self-synchronous machine is placed at room temperature for more than 2 hours, and the DC resistance of the fixed and rotating windings is measured respectively with a bridge or ohmmeter. The measurement results should meet the requirements of 3.10.
4.9 Normal insulation resistance
According to the requirements of 3.11a), use a 500 megohmmeter to measure the insulation resistance. The time for each measurement shall not be less than 3s, and the measurement results shall meet the requirements of 3.11a).
4.10 Insulation dielectric strength
According to the requirements of 3.12.a), the dielectric strength test is carried out on a test equipment with a capacity of not less than 0.5kVA. During the test, all windings of the synchro are connected together, and the time for the test voltage to increase from zero value slowly and evenly or step by step (each step does not exceed 50V) to the full value shall not be less than 105. Keep the value at 100m2. Then slowly reduce the voltage to the maximum value and disconnect the power supply. If no insulation breakdown is found during the test and the normal insulation resistance measured after the test is not less than 100M2, it is considered to meet the requirements of 3.12 a).
4.11 Direction of rotation
According to 3.13, connect the standard transmitter and the tested synchro according to Figure 1. If the tested synchro itself is correctly connected, when the standard transmitter rotates, the tested synchro should be in the same direction as the standard transmitter when viewed from the shaft extension end. Inviting magnetizing current. Excitation power and output voltage 4.12
JB /T2657.11999
Apply the excitation system with the rated voltage at the rated frequency, and measure the excitation current, excitation power, maximum output voltage and their difference according to the wiring in Figure 5.
Use a voltmeter with an internal resistance of 1875V at the excitation end. Use a voltmeter with an internal resistance of not less than 10002/V to measure the maximum output voltage by pressing each pair of wire ends of the three-pole winding in sequence. During the measurement, slowly rotate the rotor of the measured synchro until the pointer has the maximum deflection. Read the maximum output voltage and calculate the maximum output voltage difference according to the result.
The measurement results should all meet the requirements of 3.,2 Regulations. 500Hz
Figure 5 Wiring diagram for measuring rated data
4.13 Accuracy
4.13.1 For the angle receiver, use its circuit with the standard transmitter to measure the static error. Connect the tested self-synchronous angle receiver and the corresponding standard transmitter specified in Table 1 (the zero position error of the standard transmitter should not exceed 0.15°) according to Figure 1: The transmitter and receiver are respectively installed in the test frame, and the frame is fixed with a dial with a diameter of 250-300Imm concentric with the axis, and the scale on the disk is divided into 360°. The transmitter and receiver axes are equipped with overbalanced vernier pointers (Figure 6). When the excitation windings of the transmitter and receiver are aligned, the vernier pointers are calibrated to ensure that the transmitter and receiver are stable. After the rated electric repulsion is applied to the group, the pointers on the transmitter and receiver shafts are aligned to the zero position. Then, the transmitter is rotated clockwise for one revolution, and then rotated clockwise for one revolution without resetting the zero position. During the rotation, the rotor of the transmitter is fixed every 10°, and the deflection angle is read from the dial of the receiver. The error of the receiver can be obtained based on the difference in the rotor angles of the transmitter and the receiver. This error can be calculated. Half of the sum of the absolute values of the maximum positive and negative errors of the receiver when the transmitter rotates clockwise is the static error, and its value should comply with the provisions of 3.14, but the accuracy level is not divided.
4.13.2. For the self-commutation transmitter, the zero position error is measured by the zero voltage method and the accuracy level is determined. The self-commutation transmitter is installed in the test stand used for the static error test described above, and the axis is equipped with a vernier pointer that has been calibrated for balance. The rated voltage H is applied to the excitation winding, and the three pairs of terminals TI-T2, T2-T3 and T3-T1 (Figure 7) of the three-phase winding are connected to the vacuum tube medium voltage meter T cathode ray oscilloscope in turn: when any pair of terminals is connected to the vacuum tube medium voltage meter or cathode ray oscilloscope, the position where the meter or the oscilloscope indicates the minimum voltage after ten rotations is the zero position. A total of six zero positions can be obtained within the range of one rotation. For each self-commutation transmitter under test, one of the six zero positions can be selected to start the measurement. The rotor angle of the first zero position is measured as the reference, and the differences between the actual angle values of the other five zero positions and the first zero position and the theoretical 60°, 120°, 180°, 240° and 300° are the errors of each point. Half of the sum of the absolute values of the positive and negative maximum errors is the zero error, and the accuracy level of the self-synchronous angle transmitter is determined according to the provisions of 3.14:
JB/T2657.1
18° (evenly divided into 20 grids)
4'304°30
Put the pipe on the counterweight
Hole every 1.4
Figure 6 Pointer for measuring error
Material: hard aluminum
Dimension unit: mm
4.14 Maximum full-step speed
JB/T2657.1
Yi——Voltmeter for indicating power supply voltage. V—Direct current voltmeter or polar oscilloscope. Figure 7 Wiring diagram for measuring zero error
When measuring, install the self-synchronous angle transmitter in the test stand with a dial as described in 4.13.1. Ts
Fix the error measuring pointer (Figure 6) and the pulley with a diameter of 2-5 cm to the receiver shaft. Suspend the load-bearing weight through the wire wound around the wheel rim 1. to obtain the torque. This wire is wound around the pulley 2-3 times. Connect the synchro according to the figure. During the test, brake the rotor of the transmitter. The model of the standard transmitter is selected according to the provisions of Table 1. Determine the maximum full-step torque by gradually increasing the load. Keep increasing until it starts to fall. The maximum full-step torque is the product of the weight of the weight () and the radius of the cruise ship (cm) at the beginning of the fall, multiplied by 0.098, which should meet the requirements of 3.2.|| tt||4.15 Damping time
Connect the auto-synchro receiver and the standard transmitter selected according to Table 1 according to Figure 1 and install the auto-synchro receiver in the test frame. Turn the auto-synchro transmitter to brake, and install a pointer for measuring damping time (made according to Figure 8) at the extended end of the auto-synchro receiver under test. Then disconnect the power supply and rotate the receiver to 177°±2° relative to the rotor of the transmitter; then turn on the power supply again and turn on the electric stopwatch while applying positive voltage. The time required from turning on the power supply to the receiver rotor returning to the position coordinated with the transmitter is the damping time. Measure three times in total, and the average value should meet 3.15 4.16 Humidity
After applying anti-rust grease to the shaft extension end of the synchro motor, place it in a constant humidity chamber with a temperature of 20±5℃ and a relative humidity of 92%~8%. The volume of the constant humidity chamber should be twice the total volume of the synchro motor under test. The water level in the chamber should not be less than 40mm, and the surface area of the liquid should be at least 20% larger than the horizontal projection area of the synchro motor under test. The synchro motor under test should be placed on a bracket so that the bottom of the motor is about 200 away from the surface of the liquid. mm, the condensed water on the inner wall of the box is not allowed to drip onto the tested synchro, which lasts for 20cl. The temperature in the box is measured with a thermometer and collected once a day. There should be an air stirring device in the box, and the humidity is measured with a wet-bulb hygrometer. The hygrometer is installed about 300mm from the bottom. After 20d, take the synchro out of the box: after placing it for 25min, measure the insulation resistance in 5ml using the 4.9 method: then, install the tested synchro in the metal branch channel, open the exciting winding Apply rated voltage to group 1, and measure insulation resistance again after 6h+15min. If the insulated resistance between the winding and the housing and the left phase of the winding meets the requirements of 3.1I c), it is qualified.
JB/T2657.1
Figure 8 Pointer for measuring damping time
Small unit: mm
Material: aluminum plate
According to the requirements of 3.16, install the test angle machine in the metal bracket shown in Figure 9, and fix it On a 150mm×150mm×10mmmm gold exhibition board 1:. Temperature II test is carried out in a constant temperature box with a temperature of 40±2\%. The rated frequency and medium voltage 5% higher than the rated voltage are applied to the whole machine. The test should be carried out until the actual stable temperature is reached, but not less than 12h. If the temperature change does not exceed 1℃ within】h, it is considered that the actual stable temperature has been reached. The winding temperature rise is calculated by the resistance method according to the following formula: R, -R
{234.5+t)+t, - t2
Where:
Winding temperature rise, K:
Winding resistance before test,;
Winding resistance in hot state,:
t——Ambient air temperature at the beginning of the test, "C: t,
Ambient air temperature at the end of the test, ℃. 4.18 Excitation current, excitation power and maximum output voltage in hot state (2)
According to 3.17, the excitation current, excitation power and maximum output voltage and their difference of the door rectifier in hot state shall be measured by the method of 4.12. The measurement results shall still comply with the provisions of 3.2. If conditions are limited, it is allowed to take the door rectifier out of the high temperature box when the stable temperature rise is reached to measure the maximum output voltage and its difference, but the measurement shall be completed in the shortest possible time after taking it out. 4.10 Insulation dielectric strength and insulation resistance in hot state In accordance with the requirements of 3.12[b} and 311[b), the insulation dielectric strength test of hot state shall be carried out first, and the insulation resistance in hot state shall be measured immediately after the test. It shall comply with the provisions of 3.12 b) and 3.11 b) respectively. 1016 Humidity
Apply anti-rust grease to the shaft extension of the synchro motor and place it in a constant humidity chamber with a temperature of 20±5℃ and a relative humidity of 92%~8%. The volume of the constant humidity chamber should be twice the total volume of the synchro motor to be tested. The water level in the chamber should not be less than 40mm, and the surface area of the liquid should be more than 20% of the horizontal projection area of the synchro motor to be tested. The synchro motor to be tested is placed on a bracket so that the bottom of the motor is about 200mm away from the liquid surface. The condensed water droplets on the inner wall of the chamber are not allowed to drip onto the synchro motor to be tested. The test lasts for 20cl. The temperature in the chamber is measured with a thermometer and collected once a day. There should be an air stirring device in the chamber, and the humidity is measured with a wet-bulb hygrometer. The hygrometer is installed about 300mm from the bottom. After 20 days, take the synchro out of the box and place it for 25 minutes. Then, measure the insulation resistance in 5mll using the method of 4.9. Then, install the tested synchro in the metal branch channel, open the excitation winding 1 and apply the rated voltage. After 6h+15min, measure the insulation resistance again. If the insulated resistance of the winding to the housing and the left phase of the winding meet the requirements of 3.1I c), it is qualified.
JB/T2657.1
Figure 8 Pointer for measuring damping time
Small unit: mm
Material: aluminum plate
According to the requirements of 3.16, install the tested synchro in the metal bracket shown in Figure 9, and fix the bracket on the 150mm×150mm×10mm gold plate 1:. The temperature II test is carried out in a constant temperature box with a temperature of 40±2\%. The rated frequency and medium voltage 5% higher than the rated voltage are applied to the synchro. The test should be carried out until the actual stable temperature is reached, but not less than 102h. If the temperature change does not exceed 1℃ within 1h, it is considered that the actual stable temperature has been reached. The winding temperature rise is calculated by the resistance method according to the following formula: R, -R
{234.5+t)+t, - t2
Where:
Winding temperature rise, K:
Winding resistance before the test,;
Winding resistance in hot state,;
t——Temperature of the surrounding air at the beginning of the test, "C: t,
Temperature of the surrounding air at the end of the test, ℃. 4.18 Excitation current, excitation power and maximum output voltage in hot state (2)
According to 3.17, the method in 4.12 is used to measure the excitation current, excitation power and maximum output voltage of the door rectifier in hot state. The output voltage and its difference shall still meet the requirements of 3.2. If conditions are limited, it is allowed to take the tester out of the high temperature box to measure the maximum output voltage and its difference when the temperature rise is stable. However, the measurement shall be completed in the shortest possible time after taking it out. 4.10 Insulation dielectric strength and insulation resistance in hot state In accordance with the requirements of 3.12[b} and 311[b), the insulation dielectric strength test shall be carried out first, and the insulation resistance in hot state shall be measured immediately after the test. It shall meet the requirements of 3.12 b) and 3.11 b) respectively. 1016 Humidity
Apply anti-rust grease to the shaft extension of the synchro motor and place it in a constant humidity chamber with a temperature of 20±5℃ and a relative humidity of 92%~8%. The volume of the constant humidity chamber should be twice the total volume of the synchro motor to be tested. The water level in the chamber should not be less than 40mm, and the surface area of the liquid should be more than 20% of the horizontal projection area of the synchro motor to be tested. The synchro motor to be tested is placed on a bracket so that the bottom of the motor is about 200mm away from the liquid surface. The condensed water droplets on the inner wall of the chamber are not allowed to drip onto the synchro motor to be tested. The test lasts for 20cl. The temperature in the chamber is measured with a thermometer and collected once a day. There should be an air stirring device in the chamber, and the humidity is measured with a wet-bulb hygrometer. The hygrometer is installed about 300mm from the bottom. After 20 days, take the synchro out of the box and place it for 25 minutes. Then, measure the insulation resistance in 5mll using the method of 4.9. Then, install the tested synchro in the metal branch channel, open the excitation winding 1 and apply the rated voltage. After 6h+15min, measure the insulation resistance again. If the insulated resistance of the winding to the housing and the left phase of the winding meet the requirements of 3.1I c), it is qualified.
JB/T2657.1
Figure 8 Pointer for measuring damping time
Small unit: mm
Material: aluminum plate
According to the requirements of 3.16, install the tested synchro in the metal bracket shown in Figure 9, and fix the bracket on the 150mm×150mm×10mm gold plate 1:. The temperature II test is carried out in a constant temperature box with a temperature of 40±2\%. The rated frequency and medium voltage 5% higher than the rated voltage are applied to the synchro. The test should be carried out until the actual stable temperature is reached, but not less than 102h. If the temperature change does not exceed 1℃ within 1h, it is considered that the actual stable temperature has been reached. The winding temperature rise is calculated by the resistance method according to the following formula: R, -R
{234.5+t)+t, - t2
Where:
Winding temperature rise, K:
Winding resistance before the test,;
Winding resistance in hot state,;
t——Temperature of the surrounding air at the beginning of the test, "C: t,
Temperature of the surrounding air at the end of the test, ℃. 4.18 Excitation current, excitation power and maximum output voltage in hot state (2)
According to 3.17, the method in 4.12 is used to measure the excitation current, excitation power and maximum output voltage of the door rectifier in hot state. The output voltage and its difference shall still meet the requirements of 3.2. If conditions are limited, it is allowed to take the tester out of the high temperature box to measure the maximum output voltage and its difference when the temperature rise is stable. However, the measurement shall be completed in the shortest possible time after taking it out. 4.10 Insulation dielectric strength and insulation resistance in hot state In accordance with the requirements of 3.12[b} and 311[b), the insulation dielectric strength test shall be carried out first, and the insulation resistance in hot state shall be measured immediately after the test. It shall meet the requirements of 3.12 b) and 3.11 b) respectively. 10
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