CN117574688B - Estimation method for heating temperature of low-pressure casting cast aluminum rotor core - Google Patents
Estimation method for heating temperature of low-pressure casting cast aluminum rotor core Download PDFInfo
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- CN117574688B CN117574688B CN202410052895.7A CN202410052895A CN117574688B CN 117574688 B CN117574688 B CN 117574688B CN 202410052895 A CN202410052895 A CN 202410052895A CN 117574688 B CN117574688 B CN 117574688B
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- heating temperature
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 114
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 114
- 238000010438 heat treatment Methods 0.000 title claims abstract description 35
- 238000005266 casting Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 76
- 229910052742 iron Inorganic materials 0.000 claims abstract description 23
- 239000006096 absorbing agent Substances 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims description 17
- 230000009189 diving Effects 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 238000002360 preparation method Methods 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Abstract
The invention relates to an estimation method of heating temperature of a low-pressure casting cast aluminum rotor core, belongs to the technical field of motors, and solves the technical problem that the heating temperature of the existing low-pressure casting rotor core cannot be estimated. The solution scheme is as follows: an estimation method of heating temperature of low-pressure casting cast aluminum rotor core comprises the following steps: 1) Specifying relevant parameters of the cast aluminum rotor; 2) Further determining the weight of the water gap and the weight of the dummy shaft according to physical conditions; 3) Further determination of Q based on casting process Aluminum put And Q Iron absorber The method comprises the steps of carrying out a first treatment on the surface of the 4) Further sort Q according to physical coefficients Aluminum put The method comprises the steps of carrying out a first treatment on the surface of the 5) Further finishing the heating temperature T2 of the iron core; 6) According to the core heating temperature t2=660× [1-0.57× (M1/M3)]Drawing a function curve; 7) And further obtaining an estimated value chart with a reduced ratio range according to the ratio of M1/M3 of the actual condition of the cast aluminum rotor of the motor, and estimating the heating temperature T2 of the iron core according to the estimated value chart. Compared with the prior art, the method has the advantages that the heating temperature of the cast aluminum rotor core can be determined.
Description
Technical Field
The invention belongs to the technical field of motors, and particularly relates to a method for estimating heating temperature of a cast aluminum rotor core by low-pressure casting.
Background
The low-pressure casting process of the three-item asynchronous motor rotor has the advantage which is incomparable with other casting processes from the casting principle of low-pressure casting. The low-pressure and low-speed filling mode of the aluminum liquid from bottom to top is naturally beneficial to the design of the exhaust of the die, and the central casting mode is powerful in the design of the pouring gate and the pouring channel. The cast aluminum rotor motor has the most obvious advantage that compared with a wound rotor motor, the rotor punching sheet groove type can be changed along with the design, so that the rotor winding can be changed in a changeable way, and further, the performance requirements of different motors are met. The low-pressure casting has no very strict requirement on the groove type, and provides very reliable technical support for the cast aluminum rotor motor.
The heating temperature of the low-pressure cast rotor core has no technical document that can be referred to and cannot be calculated accurately.
Disclosure of Invention
In order to overcome the defects of the prior art and solve the technical problem that the heating temperature of the existing low-pressure casting rotor core cannot be estimated, the invention provides an estimation method of the heating temperature of the low-pressure casting cast aluminum rotor core.
The invention is realized by the following technical scheme.
The invention provides an estimation method of heating temperature of a low-pressure casting cast aluminum rotor core, which comprises the following steps:
1) Specifying relevant parameters of the cast aluminum rotor;
the aluminum of the cast aluminum rotor is redirected to M1, and the unit is kg;
the weight of the water gap is M2, and the unit is kg;
the total aluminum weight M aluminum of the cast aluminum rotor is set as M1+M2, and the unit is kg;
the weight of the rotor core is M3, and the unit is kg;
the dummy shaft weight is set as M4, and the unit is kg;
the total iron weight M of the cast aluminum rotor is M3+M4, and the unit is kg;
specific heat capacity of aluminum is C Aluminum (Al) The unit is J/(kg×) C;
latent heat is defined as C Diving device The unit is J/kg;
the casting temperature is set to be T1, and the unit is DEG C;
liquidus temperature is set to t Liquid and its preparation method The unit is DEG;
solidus temperature is set to t Fixing device The unit is DEG;
specific heat capacity of steel is C Steel and method for producing same The unit is J/(kg×) C;
the heating temperature of the iron core is set to be T2, and the unit is DEG C;
the heat released by the aluminum liquid is defined as Q Aluminum put The unit is J;
the heat absorbed by the iron core is defined as Q Iron absorber The unit is J;
2) Further determining the weight of the water gap and the weight of the dummy shaft according to physical conditions;
the weight M2 of the water gap is 30% of the aluminum weight M1 of the cast aluminum rotor during mold design, and the total aluminum weight Maluminum= 1.3M1 of the cast aluminum rotor is obtained after finishing;
the ratio of the dummy shaft weight M4 to the rotor core weight M3 is 0.8-1.3, and the total iron weight Miron=2M3 of the cast aluminum rotor is obtained after finishing when the ratio is 1;
3) Further determining the heat released by the molten aluminum Q according to the casting process Aluminum put And heat quantity Q absorbed by iron core Iron absorber ；
Q Aluminum put =M Aluminum (Al) ×（C Aluminum (Al) ×（T1-t Liquid and its preparation method ）+C Diving device +C Aluminum (Al) ×（T1-t Fixing device ））；
Q Iron absorber =M Iron (Fe) ×（C Steel and method for producing same ×（660-T2））；
4) Heat Q released by the aluminum liquid is further finished according to physical coefficient Aluminum put ；
From C Aluminum (Al) 880J/(kg. Times.). Degree.1 was 660℃and T was Liquid and its preparation method At 705 ℃, t Fixing device At 647 ℃, C Diving device 398000J/kg, Q is obtained after finishing Aluminum put =0.7×maluminum× (880× (705-660) +398000+880× (660-647)), further finishing to give Q Aluminum put =0.6×maluminum× 449000;
5) Q when low-pressure casting heat exchange of cast aluminum rotor reaches balance Aluminum put =Q Iron absorber Further finishing the heating of the iron coreA temperature T2;
0.6×maluminum× 449000 =m Iron (Fe) ×（C Steel and method for producing same Finishing by x (660-T2)) to obtain t2=660-585× (M aluminum/M iron);
substituting maluminum=1.3m1, miron=2m3 into t2=660-585× (maluminum/miron) finishing to obtain t2=660× [1-0.57× (M1/M3) ];
6) Drawing a function curve according to the iron core heating temperature T2=660× [1-0.57× (M1/M3) ];
7) And further obtaining an estimated graph with the ratio range reduced from a function curve according to the ratio of M1/M3 of the actual condition of the cast aluminum rotor of the motor, wherein 0< M1/M3<1, and estimating the heating temperature T2 of the iron core according to the estimated graph.
The beneficial effects achieved by the invention are as follows: the invention provides an estimation method of heating temperature of a low-pressure casting cast aluminum rotor core, which calculates the iron core heating temperature through a casting process, physical parameters, a function curve and an estimation chart, and solves the problem that the heating temperature of the existing low-pressure casting rotor core cannot be estimated.
Compared with the prior art, the method has the advantages that the heating temperature of the cast aluminum rotor core can be determined.
Drawings
FIG. 1 is a graph of a function plotted against core heating temperature in accordance with the present invention;
FIG. 2 is a graph of the estimation of the reduced ratio range of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples.
As shown in fig. 1 to 2, a method for estimating a heating temperature of a low-pressure cast aluminum rotor core includes the steps of:
1) Specifying relevant parameters of the cast aluminum rotor;
the aluminum of the cast aluminum rotor is redirected to M1, and the unit is kg;
the weight of the water gap is M2, and the unit is kg;
the total aluminum weight M aluminum of the cast aluminum rotor is set as M1+M2, and the unit is kg;
the weight of the rotor core is M3, and the unit is kg;
the dummy shaft weight is set as M4, and the unit is kg;
the total iron weight M of the cast aluminum rotor is M3+M4, and the unit is kg;
specific heat capacity of aluminum is C Aluminum (Al) The unit is J/(kg×) C;
latent heat is defined as C Diving device The unit is J/kg;
the casting temperature is set to be T1, and the unit is DEG C;
liquidus temperature is set to t Liquid and its preparation method The unit is DEG;
solidus temperature is set to t Fixing device The unit is DEG;
specific heat capacity of steel is C Steel and method for producing same The unit is J/(kg×) C;
the heating temperature of the iron core is set to be T2, and the unit is DEG C;
the heat released by the aluminum liquid is defined as Q Aluminum put The unit is J;
the heat absorbed by the iron core is defined as Q Iron absorber The unit is J;
2) Further determining the weight of the water gap and the weight of the dummy shaft according to physical conditions;
the weight M2 of the water gap is 30% of the aluminum weight M1 of the cast aluminum rotor during mold design, and the total aluminum weight Maluminum= 1.3M1 of the cast aluminum rotor is obtained after finishing;
the ratio of the dummy shaft weight M4 to the rotor core weight M3 is 0.8-1.3, and the total iron weight Miron=2M3 of the cast aluminum rotor is obtained after finishing when the ratio is 1;
3) Further determining the heat released by the molten aluminum Q according to the casting process Aluminum put And heat quantity Q absorbed by iron core Iron absorber ；
Q Aluminum put =M Aluminum (Al) ×（C Aluminum (Al) ×（T1-t Liquid and its preparation method ）+C Diving device +C Aluminum (Al) ×（T1-t Fixing device ））；
Q Iron absorber =M Iron (Fe) ×（C Steel and method for producing same ×（660-T2））；
4) Heat Q released by the aluminum liquid is further finished according to physical coefficient Aluminum put ；
The low-pressure casting adopts a forced external cooling mode after the pressure maintaining stage begins to accelerate the cooling of the die, thereby ensuring the sequential cooling of the cast aluminum rotor. In the process that the whole heat exchange reaches balance, the outer surface of the iron core is directly air-cooled, most of heat is always radiated to the air, meanwhile, the heat radiated by the aluminum liquid is directly conducted to the die, so that the temperature of the die rises and the heat is radiated through the die, and the heat of the direct heat exchange of the iron core is about 60%.
From C Aluminum (Al) 880J/(kg. Times.). Degree.1 was 660℃and T was Liquid and its preparation method At 705 ℃, t Fixing device At 647 ℃, C Diving device 398000J/kg, Q is obtained after finishing Aluminum put =0.7×maluminum× (880× (705-660) +398000+880× (660-647)), further finishing to give Q Aluminum put =0.6×maluminum× 449000;
5) Q when low-pressure casting heat exchange of cast aluminum rotor reaches balance Aluminum put =Q Iron absorber Further finishing the heating temperature T2 of the iron core;
0.6×maluminum× 449000 =m Iron (Fe) ×（C Steel and method for producing same Finishing by x (660-T2)) to obtain t2=660-585× (M aluminum/M iron);
substituting maluminum=1.3m1, miron=2m3 into t2=660-585× (maluminum/miron) finishing to obtain t2=660× [1-0.57× (M1/M3) ];
6) Drawing a function curve according to the iron core heating temperature T2=660× [1-0.57× (M1/M3) ];
7) According to the actual condition M1/M3 of the cast aluminum rotor of the motor, the ratio cannot reach 1, meanwhile, the ratio cannot be equal to 0, the range value which is reasonable is 5% -50%,0< M1/M3<1 further obtains an estimated value chart after the ratio range is reduced from the function curve, and the heating temperature T2 of the iron core is estimated according to the estimated value chart.
The invention calculates the estimation method of the heating temperature of the iron core through the casting process, the physical parameters, the function curve and the estimation chart, and solves the problem that the heating temperature of the existing low-pressure casting rotor iron core cannot be estimated.
While the embodiments of the present invention have been described in detail with reference to the drawings, the present invention is not limited to the above embodiments, and modifications, equivalent substitutions, improvements, etc. can be made within the scope of the present invention as will be within the spirit and principle of the present invention.
Claims (1)
1. A method for estimating the heating temperature of a low-pressure casting cast aluminum rotor core is characterized by comprising the following steps of: the method comprises the following steps:
1) Specifying relevant parameters of the cast aluminum rotor;
the aluminum of the cast aluminum rotor is redirected to M1, and the unit is kg;
the weight of the water gap is M2, and the unit is kg;
the total aluminum weight M aluminum of the cast aluminum rotor is set as M1+M2, and the unit is kg;
the weight of the rotor core is M3, and the unit is kg;
the dummy shaft weight is set as M4, and the unit is kg;
the total iron weight M of the cast aluminum rotor is M3+M4, and the unit is kg;
specific heat capacity of aluminum is C Aluminum (Al) The unit is J/(kg×) C;
latent heat is defined as C Diving device The unit is J/kg;
the casting temperature is set to be T1, and the unit is DEG C;
liquidus temperature is set to t Liquid and its preparation method The unit is DEG;
solidus temperature is set to t Fixing device The unit is DEG;
specific heat capacity of steel is C Steel and method for producing same The unit is J/(kg×) C;
the heating temperature of the iron core is set to be T2, and the unit is DEG C;
the heat released by the aluminum liquid is defined as Q Aluminum put The unit is J;
the heat absorbed by the iron core is defined as Q Iron absorber The unit is J;
2) Further determining the weight of the water gap and the weight of the dummy shaft according to physical conditions;
the weight M2 of the water gap is 30% of the aluminum weight M1 of the cast aluminum rotor during mold design, and the total aluminum weight Maluminum= 1.3M1 of the cast aluminum rotor is obtained after finishing;
the ratio of the dummy shaft weight M4 to the rotor core weight M3 is 0.8-1.3, and the total iron weight Miron=2M3 of the cast aluminum rotor is obtained after finishing when the ratio is 1;
3) Further determining the heat released by the molten aluminum Q according to the casting process Aluminum put And heat quantity Q absorbed by iron core Iron absorber ；
Q Aluminum put =M Aluminum (Al) ×（C Aluminum (Al) ×（T1-t Liquid and its preparation method ）+C Diving device +C Aluminum (Al) ×（T1-t Fixing device ））；
Q Iron absorber =M Iron (Fe) ×（C Steel and method for producing same ×（660-T2））；
4) Heat Q released by the aluminum liquid is further finished according to physical coefficient Aluminum put ；
From C Aluminum (Al) 880J/(kg. Times.). Degree.1 was 660℃and T was Liquid and its preparation method At 705 ℃, t Fixing device At 647 ℃, C Diving device 398000J/kg, Q is obtained after finishing Aluminum put =0.7×maluminum× (880× (705-660) +398000+880× (660-647)), further finishing to give Q Aluminum put =0.6×maluminum× 449000;
5) Q when low-pressure casting heat exchange of cast aluminum rotor reaches balance Aluminum put =Q Iron absorber Further finishing the heating temperature T2 of the iron core;
0.6×maluminum× 449000 =m Iron (Fe) ×（C Steel and method for producing same Finishing by x (660-T2)) to obtain t2=660-585× (M aluminum/M iron);
substituting maluminum=1.3m1, miron=2m3 into t2=660-585× (maluminum/miron) finishing to obtain t2=660× [1-0.57× (M1/M3) ];
6) Drawing a function curve according to the iron core heating temperature T2=660× [1-0.57× (M1/M3) ];
7) And further obtaining an estimated graph with the ratio range reduced from a function curve according to the ratio of M1/M3 of the actual condition of the cast aluminum rotor of the motor, wherein 0< M1/M3<1, and estimating the heating temperature T2 of the iron core according to the estimated graph.
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| CN202410052895.7A CN117574688B (en) | 2024-01-15 | 2024-01-15 | Estimation method for heating temperature of low-pressure casting cast aluminum rotor core |
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| CN202410052895.7A CN117574688B (en) | 2024-01-15 | 2024-01-15 | Estimation method for heating temperature of low-pressure casting cast aluminum rotor core |
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| US9284636B1 (en) * | 2011-12-21 | 2016-03-15 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Impact toughness and heat treatment for cast aluminum |
| CN111525750A (en) * | 2020-05-20 | 2020-08-11 | 山西电机制造有限公司 | Low-voltage cast aluminum core heating process of three-phase asynchronous high-voltage motor cast aluminum rotor |
| CN212371156U (en) * | 2020-05-20 | 2021-01-19 | 山西电机制造有限公司 | High-voltage motor cast aluminum rotor die based on low-pressure cast aluminum |
| CN114178504A (en) * | 2021-12-13 | 2022-03-15 | 北京航星机器制造有限公司 | Intelligent temperature control method for low-pressure casting aluminum alloy melt |
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- 2024-01-15 CN CN202410052895.7A patent/CN117574688B/en active Active
Patent Citations (4)
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|---|---|---|---|---|
| US9284636B1 (en) * | 2011-12-21 | 2016-03-15 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Impact toughness and heat treatment for cast aluminum |
| CN111525750A (en) * | 2020-05-20 | 2020-08-11 | 山西电机制造有限公司 | Low-voltage cast aluminum core heating process of three-phase asynchronous high-voltage motor cast aluminum rotor |
| CN212371156U (en) * | 2020-05-20 | 2021-01-19 | 山西电机制造有限公司 | High-voltage motor cast aluminum rotor die based on low-pressure cast aluminum |
| CN114178504A (en) * | 2021-12-13 | 2022-03-15 | 北京航星机器制造有限公司 | Intelligent temperature control method for low-pressure casting aluminum alloy melt |
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