CN111982371B - Efficiency measuring method for permanent magnet motor of ultra-high-speed oil-free air compressor - Google Patents
Efficiency measuring method for permanent magnet motor of ultra-high-speed oil-free air compressor Download PDFInfo
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- CN111982371B CN111982371B CN202010693534.2A CN202010693534A CN111982371B CN 111982371 B CN111982371 B CN 111982371B CN 202010693534 A CN202010693534 A CN 202010693534A CN 111982371 B CN111982371 B CN 111982371B
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- 238000000034 method Methods 0.000 title abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 76
- 239000000498 cooling water Substances 0.000 claims abstract description 45
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052802 copper Inorganic materials 0.000 claims abstract description 21
- 239000010949 copper Substances 0.000 claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 6
- 230000006641 stabilisation Effects 0.000 claims description 6
- 238000011105 stabilization Methods 0.000 claims description 6
- 238000000691 measurement method Methods 0.000 claims description 5
- 239000004020 conductor Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/26—Devices for measuring efficiency, i.e. the ratio of power output to power input
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
Abstract
The invention provides an efficiency measuring method of a permanent magnet motor of an ultra-high-speed oil-free air compressor, which is characterized in that temperature sensors are respectively arranged on a water inlet and a water outlet of a cooling water path of the permanent magnet motor, a stator coil and a stator core, then copper consumption and other losses of the permanent magnet motor in a no-load state, a rated rotating speed and a rated torque state with different cooling water temperatures are respectively measured, and finally the ratio (namely efficiency) of output power and input power in an actual running state is obtained through calculation. The invention measures the temperature rise of the iron core according to the heat circuit principle to obtain the loss of the motor, thereby obtaining the efficiency of the motor.
Description
Technical Field
The invention relates to an efficiency measuring method of an ultra-high speed motor, and belongs to the technical field of permanent magnet synchronous motors.
Background
The ultra-high speed oil-free air compressor is used for a fuel cell engine, and the rotating speed of a rotor of the oil-free air compressor can reach more than 10 ten thousand revolutions. The ultra-high speed permanent magnet synchronous motor adopts ultra-high bearings such as air dynamic pressure bearings and the like, and a rotor, a rotor inner fan, a first-stage turbine and a second-stage turbine of the ultra-high speed permanent magnet synchronous motor are connected together in series.
At present, an ultra-high-speed and small-sized torque sensor is not available, so that the torque cannot be measured by the torque sensor, and the output power and the efficiency of the motor can be obtained by combining rotation speed calculation. In addition, because the motor and the air compressors are completely combined together, a method of calculating the total loss and further calculating the efficiency by the serial operation of the two air compressors cannot be adopted (the serial operation mode is that one air compressor operates in a motor mode, and the other air compressor operates as a generator mode).
Disclosure of Invention
The invention provides an efficiency measuring method of a permanent magnet motor of an ultra-high-speed oil-free air compressor, which solves the problem that the efficiency of the motor cannot be measured independently due to the structural characteristics of the air compressor.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides an efficiency measurement method of hypervelocity oil-free air compressor permanent-magnet machine, permanent-magnet machine has the casing and arranges stator core, stator coil and the rotor in the casing, is fixed with the turbine on the rotor, the casing still is connected with the cooling water route, and the cooling water route is equipped with water inlet and delivery port, its characterized in that, measurement method includes:
(1) temperature sensors are respectively arranged at the water inlet, the water outlet, the stator coil and the stator core;
(2) measuring cold phase resistance R of stator coil1And recording the temperature T of the temperature sensor on the stator coil during measurementL；
(3) Removing the turbine fixed on the rotor to enable the permanent magnet motor to run in an idle state and to run to a rated rotating speed; measuring the no-load inlet water temperature, the no-load outlet water temperature and the initial environment temperature T of the cooling water channel in the no-load stateA0；
Calculating to obtain the no-load average temperature of the cooling water channel which is (no-load water inlet temperature + no-load water outlet temperature)/2;
adjusting the inlet water temperature of the cooling water path through the water cooling equipment to enable the no-load average temperature and the initial environment temperature T of the cooling water pathA0Likewise, after stabilization: first input power P of permanent magnet motor0And a first input current I0First temperature T of stator coilcu0First temperature T of stator corefe0First water inlet temperature T of cooling water channelwi0And a first outlet water temperature Two0And calculating to obtain a first average temperature T of the cooling water channelwa0＝(Twi0+Two0)/2；
First temperature rise T of stator coreRfe0＝Tfe0-Twa0；
R10For converting to the stator coil first temperature Tcu0The conversion formula of the phase resistance of the time stator coil is as follows:
R10＝R1·(K1+Tcu0)/(K1+TL)；
wherein K1Is the reciprocal of the temperature coefficient of resistance of the stator winding material at 0 ℃ for copper conductor K1＝235。
No load copper loss Pcu0＝3I0 2·R10；
First other losses P than no-load copper lossesL0＝P0-Pcu0；
Total loss and first temperature rise T of stator coreRfe0Proportional ratio, with the proportionality coefficient k ═ P0/TRfe0；
(4) The turbine is arranged on the rotor, so that the permanent magnet motor runs to rated rotating speed and rated torque, the air quantity and the air pressure output by the air compressor reach rated values, and the loading water inlet temperature, the loading water outlet temperature and the loading environment temperature T of the cooling water channel at the moment are obtained through measurementA1；
Calculating to obtain the loading average temperature of the cooling water path at the moment (loading inlet water temperature + loading outlet water temperature)/2;
the temperature of inlet water of the cooling water channel is adjusted through the water cooling equipment, so that the loading average temperature and the loading environment temperature T are enabled to beA1Likewise, the second input current I of the permanent magnet motor after stabilization is recorded1Second temperature T of stator coilcu1Second temperature T of stator corefe1The second inlet water temperature T of the cooling water pathwi1And a second outlet water temperature Two1And calculating to obtain a second average temperature T of the cooling water channelwa1＝(Twi1+Two1)/2；
Second temperature rise T of stator coreRfe1＝Tfe1-Twa1；
R11To convert to the stator coil second temperature Tcu1The conversion formula of the phase resistance of the time stator coil is as follows:
R11＝R1·(K1+Tcu1)/(K1+TL)；
rated copper loss Pcu1＝3I1 2·R11；
Calculating a second total loss P when the rated load is obtainedW1＝k·TRfe1；
Second remaining loss P in addition to nominal copper lossL1＝PW1-Pcu1；
(5) In a rated load operation state, the temperature of inlet water of the cooling water path is adjusted through the water cooling equipment, so that the temperature of the inlet water is the inlet water temperature specified in actual operation, and the actual input power P of the permanent magnet motor at the moment is measured1NActual input current I1NAnd the stabilized actual temperature T of the stator coilcu1N；
R11NFor converting to the actual temperature T of the stator coilcu1NPhase resistance of the stator coil;
actual copper loss Pcu1N＝3I1N 2·R11N；
Calculating the total loss P of rated timeW1N＝Pcu1N+PL1；
Thereby obtaining the output mechanical power P2N＝P1N-PW1N；
Finally obtaining the efficiency eff ═ P of the rated state motor2N/P1N。
The invention is based on the thermal circuit principle: the total loss is in direct proportion to the temperature rise of the iron core, the heat resistance of the heat conduction and the heat dissipation of convection of the motor is assumed to be fixed, the temperature of cooling water is adjusted, and the temperature rise of the iron core is measured to obtain the loss of the motor, so that the efficiency of the motor is obtained.
Drawings
Fig. 1 is a schematic structural view of an ultra-high speed oil-free air compressor.
Fig. 2 is a schematic diagram of an efficiency measurement method of a permanent magnet motor of an ultra-high speed oil-free air compressor.
Detailed Description
As shown in fig. 1, which is a schematic structural diagram of a permanent magnet motor of an ultra-high speed oil-free air compressor provided by the present invention, a stator core 6 having a stator coil 4 is fixed on an inner wall of a housing 5, a rotor 1 located at the center of the stator core 6 is further installed in the housing 5 through a high speed bearing 3, two ends of the rotor 1 penetrate through the housing 5 and are respectively connected with a first-stage turbine 2 and a second-stage turbine 8, and a coaxial inner fan 7 fixed on the rotor 1 is further arranged in the housing 5 for heat dissipation;
the casing 5 is further provided with a cooling water path 9, the cooling water path 9 may be arranged along the axial direction of the rotor 1, or may be arranged in a spiral shape, the present invention is not limited specifically, and the cooling water path 9 is further provided with a water inlet 91 and a water outlet 92.
The measuring process of the invention is as follows:
1. temperature sensors are respectively arranged at the hot part of the water inlet 91, the water outlet 92, the stator coil 4 and the hot part of the stator core 6;
2. measuring the cold phase resistance R of the stator coil 41And recording the temperature T of the temperature sensor on the stator coil 4 at the time of measurementL；
3. As shown in fig. 2, the first turbine 2 and the second turbine 8 fixed on the rotor 1 are removed, so that the permanent magnet motor runs in no-load mode and runs to a rated rotating speed; the no-load water inlet temperature, the no-load water outlet temperature and the initial environment temperature T of the cooling water channel 9 during the no-load are obtained through measurementA0；
Calculating to obtain the no-load average temperature of the cooling water channel 9 which is (no-load inlet water temperature + no-load outlet water temperature)/2;
the inlet water temperature of the cooling water channel 9 is adjusted by the cold water equipment, so that the no-load average temperature and the initial environment temperature T are enabledA0Likewise, after stabilization: first input power P of permanent magnet motor0And a first input current I0First temperature T of stator coil 4cu0First temperature T with stator core 6fe0First water inlet temperature T of cooling water path 9wi0And a first outlet water temperature Two0And calculating to obtain a first average value of the cooling water path 9Temperature Twa0First water inlet temperature Twi0+ first outlet water temperature Two0)/2；
First temperature rise T of stator core 6Rfe0＝Tfe0-Twa0；
R10For converting to the first temperature T of the stator coil 4cu0The conversion formula of the 4-phase resistance of the time stator coil is as follows:
R10＝R1·(K1+Tcu0)/(K1+TL)；
wherein K1Is the reciprocal of the temperature coefficient of resistance of the stator winding material at 0 ℃ for copper conductor K1＝235。
No load copper loss Pcu0＝3I0 2·R10；
First other losses P than no-load copper lossesL0＝P0-Pcu0；
According to the heat circuit principle, assuming that the thermal resistance of the heat conduction and the convection heat dissipation of the motor is fixed, the total loss and the first temperature rise T of the stator core areRfe0Proportional ratio, with the proportionality coefficient k ═ P0/TRfe0；
4. The first-stage turbine 2 and the second-stage turbine 8 are installed on the rotor 1, so that the permanent magnet motor runs to a rated rotating speed and a rated torque, the air volume and the air pressure output by the air compressor reach a rated value, and the loading water inlet temperature, the loading water outlet temperature and the loading environment temperature T of the cooling water path 9 at the moment are measuredA1；
Calculating to obtain the loading average temperature of the cooling water path 9 at the moment, which is (loading inlet water temperature + loading outlet water temperature)/2;
the temperature of the inlet water of the cooling water channel 9 is adjusted by the cold water equipment, so that the loading average temperature and the loading environment temperature TA1Likewise, the second input current I of the permanent magnet motor after stabilization is recorded1Second temperature T of stator coil 4cu1Second temperature T of stator core 6fe1And a second water inlet temperature T of the cooling water path 9wi1And a second outlet water temperature Two1And calculating to obtain a second average temperature T of the cooling water channel 9wa1(second inlet water temperature T)wi1+ second outlet water temperature Two1)/2；
Second temperature rise T of stator core 6Rfe1＝Tfe1-Twa1；
R11For conversion to the second temperature T of the stator coil 4cu1The conversion formula of the 4-phase resistance of the time stator coil is as follows:
R11＝R1·(K1+Tcu1)/(K1+TL)；
rated copper loss Pcu1＝3I1 2·R11；
Calculating a second total loss P when the rated load is obtainedW1＝k·TRfe1；
Second remaining loss P in addition to nominal copper lossL1＝PW1-Pcu1；
5. In a rated load operation state, the temperature of inlet water of the cooling water path 9 is adjusted through a water cooling device, so that the temperature of the inlet water is the inlet water temperature specified in actual operation, and the actual input power P of the permanent magnet motor at the moment is measured1NActual input current I1NAnd the stabilized actual temperature T of the stator coil 4cu1N；
R11NFor converting to the actual temperature T of the stator coil 4cu1N4-phase resistance of the stator coil;
actual copper loss Pcu1N＝3I1N 2·R11N；
Although the internal temperature distribution such as the core temperature in the rated load operation state is different from that in the step 4 operation state, since the motor outputs the same torque and the magnetic field distribution of the motor is not substantially changed, it can be considered that the remaining loss other than the copper loss in the rated load operation state is different from the second remaining loss P in the step 4 operation stateL1The same is true.
Calculating the total loss P of rated timeW1NActual copper loss Pcu1N+ second remainder loss PL1；
Thereby obtaining the output mechanical power P2NActual input power P1N-total loss PW1N；
Finally obtaining the efficiency eff of the rated state motor as the mechanical power P2NActual input Power P1N。
The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (1)
1. The utility model provides an efficiency measurement method of hypervelocity oil-free air compressor permanent-magnet machine, permanent-magnet machine has the casing and arranges stator core, stator coil and the rotor in the casing, is fixed with the turbine on the rotor, the casing still is connected with the cooling water route, and the cooling water route is equipped with water inlet and delivery port, its characterized in that, measurement method includes:
(1) temperature sensors are respectively arranged at the water inlet, the water outlet, the stator coil and the stator core;
(2) measuring cold phase resistance R of stator coil1And recording the temperature T of the temperature sensor on the stator coil during measurementL；
(3) Removing the turbine fixed on the rotor to enable the permanent magnet motor to run in an idle state and to run to a rated rotating speed; measuring the no-load inlet water temperature, the no-load outlet water temperature and the initial environment temperature T of the cooling water channel in the no-load stateA0；
Calculating to obtain the no-load average temperature of the cooling water channel which is (no-load water inlet temperature + no-load water outlet temperature)/2;
adjusting the inlet water temperature of the cooling water path through the water cooling equipment to enable the no-load average temperature and the initial environment temperature T of the cooling water pathA0Likewise, after stabilization: first input power P of permanent magnet motor0And a first input current I0First temperature T of stator coilcu0First temperature T of stator corefe0First water inlet temperature T of cooling water channelwi0And a first outlet water temperature Two0And calculating to obtain a first average temperature T of the cooling water channelwa0＝(Twi0+Two0)/2；
First temperature rise T of stator coreRfe0＝Tfe0-Twa0；
R10For converting to the stator coil first temperature Tcu0The conversion formula of the phase resistance of the time stator coil is as follows:
R10＝R1·(K1+Tcu0)/(K1+TL)；
wherein K1Is the reciprocal of the temperature coefficient of resistance of the stator winding material at 0 ℃ for copper conductor K1＝235；
No load copper loss Pcu0＝3I0 2·R10；
First other losses P than no-load copper lossesL0＝P0-Pcu0；
Total loss and first temperature rise T of stator coreRfe0Proportional ratio, with the proportionality coefficient k ═ P0/TRfe0；
(4) The turbine is arranged on the rotor, so that the permanent magnet motor runs to rated rotating speed and rated torque, the air quantity and the air pressure output by the air compressor reach rated values, and the loading water inlet temperature, the loading water outlet temperature and the loading environment temperature T of the cooling water channel at the moment are obtained through measurementA1；
Calculating to obtain the loading average temperature of the cooling water path at the moment (loading inlet water temperature + loading outlet water temperature)/2;
the temperature of inlet water of the cooling water channel is adjusted through the water cooling equipment, so that the loading average temperature and the loading environment temperature T are enabled to beA1Likewise, the second input current I of the permanent magnet motor after stabilization is recorded1Second temperature T of stator coilcu1Second temperature T of stator corefe1The second inlet water temperature T of the cooling water pathwi1And a second outlet water temperature Two1And calculating to obtain a second average temperature T of the cooling water channelwa1＝(Twi1+Two1)/2；
Second temperature rise T of stator coreRfe1＝Tfe1-Twa1；
R11To convert to the stator coil second temperature Tcu1The conversion formula of the phase resistance of the time stator coil is as follows:
R11＝R1·(K1+Tcu1)/(K1+TL)；
rated copper loss Pcu1＝3I1 2·R11；
Calculating a second total loss P when the rated load is obtainedW1＝k·TRfe1；
Second remaining loss P in addition to nominal copper lossL1＝PW1-Pcu1；
(5) In a rated load operation state, the temperature of inlet water of the cooling water path is adjusted through the water cooling equipment, so that the temperature of the inlet water is the inlet water temperature specified in actual operation, and the actual input power P of the permanent magnet motor at the moment is measured1NActual input current I1NAnd the stabilized actual temperature T of the stator coilcu1N；
R11NFor converting to the actual temperature T of the stator coilcu1NPhase resistance of the stator coil;
actual copper loss Pcu1N＝3I1N 2·R11N；
Calculating the total loss P of rated timeW1N＝Pcu1N+PL1；
Thereby obtaining the output mechanical power P2N＝P1N-PW1N；
Finally obtaining the efficiency eff ═ P of the rated state motor2N/P1N。
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2020
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Patent Citations (7)
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|---|---|---|---|---|
| CN103674375A (en) * | 2012-09-21 | 2014-03-26 | 南京九舜磁悬浮科技有限公司 | Device for measuring quarter circular magnetic energy output efficiency |
| JP2016065789A (en) * | 2014-09-25 | 2016-04-28 | 小林 璋好 | Efficiency measurement method of motor |
| CN107783038A (en) * | 2016-08-26 | 2018-03-09 | 中国船舶重工集团海装风电股份有限公司 | A kind of method of testing of double-fed wind power generator efficiency, apparatus and system |
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