Automobile motor rotor unbalance design method
Published:
2019-05-23 14:35
At present, it is a complicated work to determine the allowable unbalance of the rotor, because in the mass production of the rotor, the necessity, possibility and cost of the process must be considered at the same time.Therefore, there is no authoritative theoretical calculation method to determine the allowable unbalance of machinery in the world, and only the most effective method to determine the allowable unbalance of rotor is to make statistics and analysis through durability experiment.Therefore, the state selects the accuracy level according to relevant standards and the technological capacity of the enterprise, and determines the balance quality level G value of the rotor.
The balancing quality grade G of the rotor is divided into 11 grades in gb9239-88, including G0.4, G1, G2.5, G6.3, G16, G40, G100, G250, G630, G1600 and G4000. The corresponding grade standard is selected according to the application type of rotor drive.
Table 1 classification criteria table below
|
G4000 |
Crankshaft drive of low speed Marine diesel engine with single cylinder rigid mounting |
|
G100 |
Rigidly mounted crankshaft drive for large two - stroke engines |
|
G630 |
Rigidly mounted crankshaft drive for large four - stroke engines
Flexibly mounted crankshaft drive for Marine diesel engines |
|
G250 |
Rigidly mounted crankshaft drive for high - speed four - cylinder diesel engines |
|
G100 |
Crankshaft driving parts for six-cylinder and multi-cylinder high-speed diesel engines;A complete engine for automobiles, lorries, and locomotives |
|
G40 |
Automotive wheels, hub, wheel body, transmission shaft, flexible installation of six cylinder and multi-cylinder high-speed four-stroke engine crankshaft drive parts |
|
G16 |
Special requirements of the drive shaft (propeller, universal joint drive shaft);Parts of the grinder;Parts for agricultural machinery;Individual parts of an automobile engine;Crankshaft drive for six - cylinder and multi - cylinder engines as specified |
|
G6.3 |
Gears for the main turbines of merchant ships and seagoing vessels;Drum wheel of high speed separator;Fan;Rotor parts for aviation gas turbines;Impeller of pump;Machine tools and general machine parts;Common motor rotor;Specific engine parts required |
|
G2.5 |
Gas and steam turbines;Machine tool driving parts;Medium and large motor rotors with special requirements;Small motor rotor;Turbine pump |
|
G1 |
Drives for tape recorders and record players, CDS and DVDS;Grinding machine drive parts;Small armature with special requirement |
|
G0.4 |
Spindle of precision grinding machine; Motor rotor; gyroscope |
Note: general general motor rotor G value is 6.3 class
Rotor balance quality grade G and the unbalance of the rotor е maximum operating speed and rotor noise related omega, its formula is:G = е * / 1000 omega
(1) if n is the highest operating speed of the rotor, in r/min, =2 n/60. First, according to the actual application of the design of the motor to choose the balance level, then according to =2 n/60 to calculate the highest operating speed of the rotor, and finally according to the corresponding known parameters input into the formula (1).The deformation formula for: е = G * 1000 / omega
(2) however, at present, the motors of manufacturing enterprises are all batch products, and due to the influence of components and other factors, the rotational speed may fluctuate within a certain range. Therefore, manufacturing factories generally refer to table (2) to confirm the application range of unbalance.
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