CN105116332A - Test method for motor under high-temperature and low-pressure environment - Google Patents

Abstract

The invention relates to a test method of a motor under a high-temperature and low-pressure environment and belongs to the technical field of motor characteristic testing under the high-temperature and low-pressure environment. The test method includes the following steps that: a measured motor and a standby motor are arranged in a low-pressure experimental box; the measured motor works in a motor state, and the standby motor works in a generator state; the stator current of the measured motor is gradually decreased to 0.5-times rated current from 1.5-times rated current; the stray loss of the measured motor working in the motor state is P<Ms>; the measured motor works in a generator state, and the standby motor works in a motor state; the stator current of the standby motor is gradually decreased to 0.5-times rated current from 1.5-times rated current; the stray loss of the measured motor working in the generator state is P<Gs>; and the average value P<->s of the stray loss of the load of the measured motor can be obtained based on the above measured parameters and calculation results. With the test method of the invention adopted, the parameters of the motor can be detected under the high-temperature and low-pressure environment. According to the test method, and the motor can be tested under the high-temperature and low-pressure environment through adopting a double-motor back-to-back test method, and the loss values of various parameters of the motor can be calculated accurately.

Description

A test method for motors under high temperature and low pressure environment

technical field

The invention belongs to the technical field of motor characteristic testing under high temperature and low pressure environment.

Background technique

With the continuous exploration of human beings in the field of outer space, motors, which are essential executive and functional components in aerospace, will be more and more used in various extreme environments, such as high temperature and low pressure environments. Before using the motor, it must be adjusted The performance of the motor is tested accordingly to verify whether it can work normally in the extreme environment of high temperature and low pressure, and the performance meets the design requirements. However, the existing testing methods for electric motors are mostly suitable for normal temperature and normal pressure conditions, and cannot meet the testing requirements for electric motors under high temperature and low pressure conditions.

Contents of the invention

The purpose of the present invention is to provide a test method for motors under high temperature and low pressure environment, in order to solve the problem that the existing test methods for motors are mostly suitable for normal temperature and pressure conditions, but cannot meet the test of motors under high temperature and low pressure conditions.

The described purpose is achieved through the following scheme: the test method of the motor under the described a kind of high temperature and low pressure environment, its method steps are:

Step 1: Select a motor with the same specifications as the tested motor 1, or a motor with the same synchronous speed as the tested motor 1 but with a power greater than the tested motor 1 as the accompanying motor 2; the output shaft of the tested motor 1 Connect the output shaft of the accompanying motor 2 through the coupling 3, and then put it into the high-low temperature, low-pressure test box 4 and fix it. Set the test temperature in the high-low temperature, low-pressure test box 4 between 100°C and 200°C. The air pressure value is set at less than 0.01Mpa, making it close to the pressure value of the vacuum environment in outer space;

Step 2: make the tested motor 1 work in the motor state, and the accompanying motor 2 work in the generator state; the first driver 5 drives the tested motor 1 to run and work, so that the tested motor 1 works at the rated frequency and rated voltage; the second The driver 6 drives the accompanying motor 2 to work, so that the accompanying motor 2 applies a reverse drive relative to the direction of the tested motor 1; adjust the second driver 6 to make the tested motor 1 run to a stable state under rated load;

Step 3: Adjust the accompanying motor 2 through the second driver 6, so that the stator current of the tested motor 1 gradually changes from 1.5 times the rated current to 0.5 times the rated current, and read the value of the tested motor 1 running as a motor during this process Three-phase line current I _M1 , input power P _M1 , and stator winding resistance value R _M1 . During the test, the frequency and voltage of the tested motor 1 must be kept at the rated value; at the same time, read the value of the companion motor 2 working in the generator state. Three-phase line current I _G1 , output power P _G2 , and stator winding resistance R _G1 ; using the experimental data obtained from the above measurements and combining the following formulas, the stator copper loss of the tested motor 1 and the accompanying motor 2 can be calculated:

${\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; c</span>}\mathrm{<span\; class="notranslate">\; u</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1.5</span>}{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; ;</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}\mathrm{<span\; class="notranslate">\; c</span>}\mathrm{<span\; class="notranslate">\; u</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1.5</span>}{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; ;</span>$

Step 4: Determine the slips s _M and s _G of the tested motor 1 and the accompanying motor 2 by using a clamp-on ammeter to measure the current of one phase of the rotor. The use of slip test equipment; first record the number of swings N _M , N _G of the pointer of the ammeter, and use a stopwatch to record the time t _M , t _G of N _M , N _G swings; then use the following formula to determine the measured motor 1 and Slips s _M and s _G of accompanying motor 2:

${\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 100</span>}\mathrm{<span\; class="notranslate">\; \%</span>}<span\; class="notranslate">\; ;</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}}{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}}}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 100</span>}\mathrm{<span\; class="notranslate">\; \%</span>}<span\; class="notranslate">\; ,</span>$

In the formula, f _M is the rated frequency of the tested motor 1; f _G is the frequency of the accompanying motor 2, which is less than the rated frequency;

Step 5: The rotor copper loss P _Mcu2 of the tested motor 1 working in the motor state: P _Mcu2 = s _M (P _M1 -P _Mcu1 -P _fe ); the rotor copper loss P _Gcu2 of the accompanying motor 2 working in the generator state : P _Gcu2 =s _G (P _G2 -P _Gcu1 -P _fe );

Step 6: The stray loss P _Ms of the tested motor 1 working in the motor state: P _Ms =∑P _s P _Mcu2 /(P _Gcu2 +P _Mcu2 ), where ∑P _s is the measured motor 1 and the accompanying The total stray loss of motor 2, and the calculation formula of ΣP _s is:

ΣP _s = P _M1 -P _G2 -P _Mcu1 -P _Gcu1 -P _Mcu2 -P _Gcu2 -P _fe -P' _fe -P _Δ -P'_Δ;

Step 7: stop the tested motor 1 and the accompanying motor 2 to work; make the tested motor 1 work in the generator state, and the accompanying motor 2 work in the motor state; the second driver 6 drives the accompanying motor 2 to work, so that the accompanying motor 2 Work at the rated voltage and greater than the rated frequency; the first driver 5 drives the motor under test 1 to work, so that the motor under test 1 applies a reverse drive relative to the direction of the accompanying motor 2; adjust the first driver 5 so that the accompanying motor 2 When the load value of the motor is equal to the nominal load value of the tested motor 1, it runs to a steady state;

Step 8: Adjust the motor 1 under test through the first driver 5 so that the stator current of the accompanying motor 2 gradually changes from 1.5 times the rated current to 0.5 times the rated current. Phase line current I _M1 , input power P _M1 , stator winding resistance R _M1 , the frequency and voltage of the tested motor 1 must be kept at the rated value during the test; at the same time, read the measured motor 1 working in the generator state Three-phase line current I _G1 , output power P _G2 , and stator winding resistance R _G1 ; using the experimental data obtained from the above measurements and combining the following formulas, the stator copper loss of the tested motor 1 and the accompanying motor 2 can be calculated:

${\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; c</span>}\mathrm{<span\; class="notranslate">\; u</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1.5</span>}{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; ;</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}\mathrm{<span\; class="notranslate">\; c</span>}\mathrm{<span\; class="notranslate">\; u</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1.5</span>}{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; ;</span>$

Step 9: Determine the slips s _G and s _M of the tested motor 1 and the accompanying motor 2 by measuring the current of one phase of the rotor with a clamp ammeter. The use of slip test equipment; first record the number of swings N _G and N _M of the pointer of the ammeter, and use a stopwatch to record the time t _G and t _M of the swings of N _G and N _M times; then use the following formula to determine the measured motor 1 and Slips s _G and s _M of accompanying motor 2:

${\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}}{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}}}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 100</span>}\mathrm{<span\; class="notranslate">\; \%</span>}<span\; class="notranslate">\; ;</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 100</span>}\mathrm{<span\; class="notranslate">\; \%</span>}<span\; class="notranslate">\; ,</span>$

In the formula, f _G is the rated frequency of the tested motor 1; f _M is the frequency of the accompanying motor 2, which is greater than the rated frequency of the tested motor 1;

Step 10: The rotor copper loss P _Mcu2 of the accompanying motor 2 working in the motor state: P _Mcu2 =s _M (P _M1 -P _Mcu1 -P′ _fe ); the rotor copper loss P of the tested motor 1 working in the generator state _Gcu2 : P _Gcu2 =s _G (P _G2 -P _Gcu1 -P _fe );

Step 11: The stray loss P _Gs of the motor under test 1 working in the generator state is: P _Gs =∑P _s P _Gcu2 /(P _Gcu2 +P _Mcu2 ), where ∑P _s is the motor under test 1 and the total stray loss of the accompanying motor 2, but at this time P _Gcu2 is the copper loss of the rotor of the tested motor 1, P _Mcu2 is the copper loss of the rotor of the accompanying motor 2, and the calculation formula of ΣP _s is:

ΣP _s = P _M1 -P _G2 -P _Mcu1 -P _Gcu1 -P _Mcu2 -P _Gcu2 -P _fe -P' _fe -P _Δ -P'_Δ;

Step 12: Combining the measurement parameters and calculation results in the above steps to obtain the average value of the load stray loss of the tested motor 1 for: Approximate average value of the rotor current of the tested motor 1 in the motor and generator states for: In the formula, I ₁ is the stator current of the tested motor 1 in the above steps during the load test, that is, the stator current of the tested motor 1 in the motor state and the generator state, and I ₀ is the tested motor 1 during the no-load test, The stator current corresponding to the rated voltage.

The method of the present invention can measure the parameters of the motor under the high temperature and low pressure environment, and use the method of double-drag to test the motor under the environment, thus avoiding the shortcoming that some equipment cannot work normally under the environment, and the measurement accuracy The design requirements can still be guaranteed, and the loss values of the motor can be accurately calculated.

Description of drawings

Fig. 1 is a schematic structural view of the device involved in the method of the present invention.

Detailed ways

Specific embodiment one: in conjunction with shown in Fig. 1, illustrate the technical scheme of this specific embodiment, its method step is:

Step 1: Select a motor with the same specifications as the tested motor 1, or a motor with the same synchronous speed as the tested motor 1 but with a power greater than the tested motor 1 as the accompanying motor 2; the output shaft of the tested motor 1 Connect the output shaft of the accompanying motor 2 through the coupling 3, and then put it into the high-low temperature, low-pressure test box 4 and fix it. Set the test temperature in the high-low temperature, low-pressure test box 4 between 100°C and 200°C. The air pressure value is set at less than 0.01Mpa, making it close to the pressure value of the vacuum environment in outer space;

Step 2: make the tested motor 1 work in the motor state, and the accompanying motor 2 work in the generator state; the first driver 5 drives the tested motor 1 to run and work, so that the tested motor 1 works at the rated frequency and rated voltage; the second The driver 6 drives the accompanying motor 2 to work, so that the accompanying motor 2 applies a reverse drive relative to the direction of the tested motor 1; adjust the second driver 6 to make the tested motor 1 run to a stable state under rated load;

Step 3: Adjust the accompanying motor 2 through the second driver 6, so that the stator current of the tested motor 1 gradually changes from 1.5 times the rated current to 0.5 times the rated current, and read the value of the tested motor 1 running as a motor during this process Three-phase line current I _M1 , input power P _M1 , and stator winding resistance value R _M1 . During the test, the frequency and voltage of the tested motor 1 must be kept at the rated value; at the same time, read the value of the companion motor 2 working in the generator state. Three-phase line current I _G1 , output power P _G2 , and stator winding resistance R _G1 ; using the experimental data obtained from the above measurements and combining the following formulas, the stator copper loss of the tested motor 1 and the accompanying motor 2 can be calculated:

${\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; c</span>}\mathrm{<span\; class="notranslate">\; u</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1.5</span>}{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; ;</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}\mathrm{<span\; class="notranslate">\; c</span>}\mathrm{<span\; class="notranslate">\; u</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1.5</span>}{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; ;</span>$

Step 4: Determine the slips s _M and s _G of the tested motor 1 and the accompanying motor 2 by using a clamp-on ammeter to measure the current of one phase of the rotor. The use of slip test equipment; first record the number of swings N _M , N _G of the pointer of the ammeter, and use a stopwatch to record the time t _M , t _G of N _M , N _G swings; then use the following formula to determine the measured motor 1 and Slips s _M and s _G of accompanying motor 2:

${\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 100</span>}\mathrm{<span\; class="notranslate">\; \%</span>}<span\; class="notranslate">\; ;</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}}{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}}}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 100</span>}\mathrm{<span\; class="notranslate">\; \%</span>}<span\; class="notranslate">\; ,</span>$

In the formula, f _M is the rated frequency of the tested motor 1; f _G is the frequency of the accompanying motor 2, which is less than the rated frequency;

Step 5: The rotor copper loss P _Mcu2 of the tested motor 1 working in the motor state: P _Mcu2 = s _M (P _M1 -P _Mcu1 -P _fe ); the rotor copper loss P _Gcu2 of the accompanying motor 2 working in the generator state : P _Gcu2 =s _G (P _G2 -P _Gcu1 -P′ _fe );

Step 6: The stray loss P _Ms of the tested motor 1 working in the motor state: P _Ms =∑P _s P _Mcu2 /(P _Gcu2 +P _Mcu2 ), where ∑P _s is the measured motor 1 and the accompanying The total stray loss of motor 2, and the calculation formula of ΣP _s is:

ΣP _s = P _M1 -P _G2 -P _Mcu1 -P _Gcu1 -P _Mcu2 -P _Gcu2 -P _fe -P' _fe -P _Δ -P'_Δ;

Step 7: stop the tested motor 1 and the accompanying motor 2 to work; make the tested motor 1 work in the generator state, and the accompanying motor 2 work in the motor state; the second driver 6 drives the accompanying motor 2 to work, so that the accompanying motor 2 Work at the rated voltage and greater than the rated frequency; the first driver 5 drives the motor under test 1 to work, so that the motor under test 1 applies a reverse drive relative to the direction of the accompanying motor 2; adjust the first driver 5 so that the accompanying motor 2 When the load value of the motor is equal to the nominal load value of the tested motor 1, it runs to a steady state;

Step 8: Adjust the motor 1 under test through the first driver 5 so that the stator current of the accompanying motor 2 gradually changes from 1.5 times the rated current to 0.5 times the rated current. Phase line current I _M1 , input power P _M1 , stator winding resistance value R _M1 , the frequency and voltage of the tested motor 1 must be kept at the rated value during the test; at the same time, read the measured motor 1 working in the generator state Three-phase line current I _G1 , output power P _G2 , and stator winding resistance R _G1 ; using the experimental data obtained from the above measurements and combining the following formulas, the stator copper loss of the tested motor 1 and the accompanying motor 2 can be calculated:

${\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; c</span>}\mathrm{<span\; class="notranslate">\; u</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1.5</span>}{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; ;</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}\mathrm{<span\; class="notranslate">\; c</span>}\mathrm{<span\; class="notranslate">\; u</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1.5</span>}{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; ;</span>$

Step 9: Determine the slips s _G and s _M of the tested motor 1 and the accompanying motor 2 by measuring the current of one phase of the rotor with a clamp ammeter. The use of slip test equipment; first record the number of swings N _G and N _M of the pointer of the ammeter, and use a stopwatch to record the time t _G and t _M of the swings of N _G and N _M times; then use the following formula to determine the measured motor 1 and Slips s _G and s _M of accompanying motor 2:

${\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}}{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}}}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 100</span>}\mathrm{<span\; class="notranslate">\; \%</span>}<span\; class="notranslate">\; ;</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 100</span>}\mathrm{<span\; class="notranslate">\; \%</span>}<span\; class="notranslate">\; ,</span>$

In the formula, f _G is the rated frequency of the tested motor 1; f _M is the frequency of the accompanying motor 2, which is greater than the rated frequency of the tested motor 1;

Step 10: The rotor copper loss P _Mcu2 of the accompanying motor 2 working in the motor state: P _Mcu2 =s _M (P _M1 -P _Mcu1 -P′ _fe ); the rotor copper loss P of the tested motor 1 working in the generator state _Gcu2 : P _Gcu2 =s _G (P _G2 -P _Gcu1 -P′ _fe );

Step 11: The stray loss P _Gs of the motor under test 1 working in the generator state is: P _Gs =∑P _s P _Gcu2 /(P _Gcu2 +P _Mcu2 ), where ∑P _s is the motor under test 1 and the total stray loss of the accompanying motor 2, but at this time P _Gcu2 is the copper loss of the rotor of the tested motor 1, P _Mcu2 is the copper loss of the rotor of the accompanying motor 2, and the calculation formula of ΣP _s is:

ΣP _s = P _M1 -P _G2 -P _Mcu1 -P _Gcu1 -P _Mcu2 -P _Gcu2 -P _fe -P' _fe -P _Δ -P'_Δ;

Step 12: Combining the measurement parameters and calculation results in the above steps to obtain the average value of the load stray loss of the tested motor 1 for: Approximate average value of the rotor current of the tested motor 1 in the motor and generator states for: In the formula, I ₁ is the stator current of the tested motor 1 in the above steps during the load test, that is, the stator current of the tested motor 1 in the motor state and the generator state, and I ₀ is the tested motor 1 during the no-load test, The stator current corresponding to the rated voltage.

Working principle: The high-temperature and low-pressure test environment required for the experiment can be completed directly by using the high-low temperature and low-pressure test box. It is only necessary to put the motor under test together with the measuring equipment into the test box. Can not work normally, for this reason the present invention proposes and utilizes the method for measuring the performance parameter of the motor under test to measure the performance parameter of the motor under test, that is, selects the same specification as the motor under test, or has the same synchronous speed as the motor under test, and other motors whose power is greater than the motor under test Specifications of the motor as a companion test motor.

Firstly, the no-load test is carried out on the tested motor and the accompanying motor to determine its iron loss and mechanical loss. The test method is to put the motor under test and the motor under test respectively into the high-low temperature and low-voltage test box and fix them, then run the motor under test and the motor under test under no-load at rated voltage and frequency respectively, and when the mechanical loss is stable, By controlling the voltage applied to the stator winding of the motor, the no-load test is completed, and the required core loss and mechanical loss of the tested motor are calculated. In order to determine the no-load stator copper loss of the motor, it is necessary to read the resistance value of the motor stator winding each time the measured parameters are read.

Use a coupling that can still work normally under high temperature and low pressure to connect the motor under test and the accompanying motor, and then put the connected motor under test and the accompanying motor together into the high, low temperature, and low pressure test box to be tested. The test motor is connected to an AC power supply capable of outputting rated frequency, and the accompanying test motor is connected to an AC power supply with adjustable frequency. After connecting some necessary equipment with the motor under test and the motor under test, related measurements can be carried out.

First, no-load test is carried out on the motor to determine the core loss and mechanical loss of the motor under test and the motor under test. During the measurement process, let the motor under test and the test motor run without load at rated voltage and rated frequency until the mechanical loss is stable, adjust the voltage applied to the stator winding, and measure the required motor performance parameters during this process to complete Motor no-load test. The no-load test mainly determines the core loss and mechanical loss P _fe and P _Δ of the motor under test and the core loss and mechanical loss of the motor under test and P′ _Δ . Since the resistance value of the stator winding of a motor working under high temperature and low pressure will be affected by both temperature and pressure, the formula for calculating the resistance value is not applicable again, so it must be read every time the measured parameter is read. value.

The method of double-machine pairing consists of two processes. In order to avoid large errors in the measurement results, the measuring instruments need to be calibrated.

Claims (1)

1. the method for testing of motor under high-temperature low-pressure environment, is characterized in that its method step is:

Step one: select one identical with by measured motor (1) specification, or with by measured motor (1), there is identical synchronous rotational speed but power is greater than by the motor of other specification of measured motor (1) as accompanying and serving motor (2); Be in transmission connection by the output revolving shaft of measured motor (1) by shaft coupling (3) and the output revolving shaft of accompanying and serving motor (2), probe temperature in high/low temperature low atmospheric pressure test case (4) is arranged between 100 DEG C ~ 200 DEG C, atmospheric pressure value is arranged on and is less than 0.01Mpa, makes it close to the force value of the vacuum environment of the outer space;

Step 2: make to be operated in electric motor state by measured motor (1), accompany and serve motor (2) and be operated in Generator Status; First driver (5) drives by measured motor (1) operation, makes to be worked under rated frequency and rated voltage by measured motor (1); Second driver (6) drives accompanies and serves motor (2) work, makes to accompany and serve motor (2) and turns to upper applying reverse drive relative to by measured motor (1); The second driver (6) is regulated to make in nominal load situation, to be run to steady state (SS) by measured motor (1);

Step 3: regulated by the second driver (6) and accompany and serve motor (2), make to be changed to 0.5 times of rated current by the stator current of measured motor (1) gradually from 1.5 times of rated current, read in this course as motor running by the triple-phase line electric current I of measured motor (1) _m1, power input P _m1, stator winding resistance value R _m1, need in process of the test to keep being always ratings by the frequency and voltage of measured motor (1); Read work is in the triple-phase line electric current I of accompanying and serving motor (2) of Generator Status simultaneously _g1, output power P _g2, stator winding resistance value R _g1; The experimental data utilizing above-mentioned measurement to obtain also just can calculate by measured motor (1) and the stator copper loss of accompanying and serving motor (2) in conjunction with following formula:

$P_{Mcu1}=1.5I_{M1}{R}_{M1}^2;P_{Gcu1}=1.5I_{G1}{R}_{G1}^2;$

Step 4: the method measuring rotor one phase current with tong-type ammeter is determined by measured motor (1) and the revolutional slip s accompanying and serving motor (2) _mand s _g, adopt the method mainly to consider that motor measurement environment constrains other in order to determine the use of the experimental facilities of motor slip ratio; First the number of oscillations N of record current list index _m, N _g, and with stopwatch record N _m, N _gthe time t of secondary swing _m, t _g; Then following formula is used to determine by measured motor (1) and the revolutional slip s accompanying and serving motor (2) _mand s _g:

$s_M=\frac{N_M}{2t_M{f}_M}\&times;100\%;$ $s_G=\frac{N_G}{2t_G{f}_G}\&times;100\%,$

In formula, f _mfor by the rated frequency of measured motor (1); f _gfor accompanying and serving the frequency of motor (2), this frequency is less than rated frequency;

Step 5: be operated in electric motor state by the rotor copper loss P of measured motor (1) _mcu2: P _mcu2=s _m(P _m1-P _mcu1-P _fe); Be operated in the rotor copper loss P accompanying and serving motor (2) of Generator Status _gcu2: P _gcu2=s _g(P _g2-P _gcu1-P` _fe);

Step 6: be operated under electric motor state by the stray loss P of measured motor (1) _ms: P _ms=∑ P _sp _mcu2/ (P _gcu2+ P _mcu2), in formula, ∑ P _sfor by measured motor (1) and total stray loss of accompanying and serving motor (2), and ∑ P _scomputing formula be:

∑P _s＝P _M1-P _G2-P _Mcu1-P _Gcu1-P _Mcu2-P _Gcu2-P _fe-P` <sub>fe</sub>-P <sub>Δ</sub>-P` _Δ；

Step 7: and motor (2) will be accompanied and served to shut down work by measured motor (1); Make to be operated in Generator Status by measured motor (1), accompany and serve motor (2) and be operated in electric motor state; Second driver (6) drives and accompanies and serves motor (2) operation, makes to accompany and serve motor (2) and works under rated voltage He under being greater than rated frequency condition; First driver (5) drives by measured motor (1) work, makes to be turned to upper applying reverse drive by measured motor (1) relative to accompanying and serving motor (2); The load value regulating the first driver (5) to make to accompany and serve motor (2) be worth equal situation by measured motor (1) nominal load under run to steady state (SS);

Step 8: regulated by measured motor (1) by the first driver (5), make the stator current of accompanying and serving motor (2) change to 0.5 times of rated current gradually from 1.5 times of rated current, read the triple-phase line electric current I of accompanying and serving motor (2) as motor running in this course _m1, power input P _m1, stator winding resistance value R _m1, need in process of the test to keep being always ratings by the frequency and voltage of measured motor (1); Simultaneously read work at Generator Status by the triple-phase line electric current I of measured motor (1) _g1, output power P _g2, stator winding resistance value R _g1; The experimental data utilizing above-mentioned measurement to obtain also just can calculate by measured motor (1) and the stator copper loss of accompanying and serving motor (2) in conjunction with following formula:

$P_{Mcu1}=1.5I_{M1}{R}_{M1}^2;$ $P_{Gcu1}=1.5I_{G1}{R}_{G1}^2;$

Step 9: the method measuring rotor one phase current with tong-type ammeter is determined by measured motor (1) and the revolutional slip s accompanying and serving motor (2) _gand s _m, adopt the method mainly to consider that motor measurement environment constrains other in order to determine the use of the experimental facilities of motor slip ratio; First the number of oscillations N of record current list index _g, N _m, and with stopwatch record N _g, N _mthe time t of secondary swing _g, t _m; Then following formula is used to determine by measured motor (1) and the revolutional slip s accompanying and serving motor (2) _gand s _m:

$s_G=\frac{N_G}{2t_G{f}_G}\&times;100\%;$ $s_M=\frac{N_M}{2t_M{f}_M}\&times;100\%,$

In formula, f _gfor by the rated frequency of measured motor (1); f _mfor accompanying and serving the frequency of motor (2), this frequency is greater than by the rated frequency of measured motor (1);

Step 10: the rotor copper loss P accompanying and serving motor (2) being operated in electric motor state _mcu2: P _mcu2=s _m(P _m1-P _mcu1-P` _fe); Be operated in Generator Status by the rotor copper loss P of measured motor (1) _gcu2: P _gcu2=s _g(P _g2-P _gcu1-P _fe);

Step 11: be operated under Generator Status by the stray loss P of measured motor (1) _gsfor: P _gs=∑ P _sp _gcu2/ (P _gcu2+ P _mcu2), in formula, ∑ P _sfor by measured motor (1) and total stray loss of accompanying and serving motor (2), but now P _gcu2for by measured motor (1) rotor copper loss, P _mcu2for accompanying and serving motor (2) rotor copper loss, and ∑ P _scomputing formula be:

∑P _s＝P _M1-P _G2-P _Mcu1-P _Gcu1-P _Mcu2-P _Gcu2-P _fe-P` <sub>fe</sub>-P <sub>Δ</sub>-P` _Δ；

Step 12: ask for by the mean value of measured motor (1) load stray loss in conjunction with the measurement parameter in above-mentioned steps and calculating knot for: by the approximate average of measured motor (1) at motor and Generator Status rotor electric current for: in formula, I ₁for during load test by measured motor (1) stator current in above-mentioned steps, namely by measured motor (1) stator current under electric motor state and Generator Status, I ₀for during by measured motor (1) no-load test, the stator current that rated voltage is corresponding.