CN109307499B - Method for calculating eccentric distance of motor eccentric shaft by using linear spring - Google Patents
Method for calculating eccentric distance of motor eccentric shaft by using linear spring Download PDFInfo
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- CN109307499B CN109307499B CN201811299932.5A CN201811299932A CN109307499B CN 109307499 B CN109307499 B CN 109307499B CN 201811299932 A CN201811299932 A CN 201811299932A CN 109307499 B CN109307499 B CN 109307499B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/22—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes
- G01B21/24—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes for testing alignment of axes
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- General Physics & Mathematics (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention discloses a method for calculating the eccentric distance of an eccentric shaft of a motor by using a linear spring, belonging to the technical field of measurement of the eccentric distance of a motor shaft. It comprises the following steps: step one, mounting a motor on a linear spring to form a vibration system; step two, measuring elasticity caused by motor weightTotal deformation x0(ii) a Thirdly, measuring the vibration acceleration a by using a sensor0(ii) a Step four, calculating the rated inertia force F of the motor shaft by using the measured dataI(ii) a Step five, utilizing the rated inertia force FIAnd calculating the eccentricity e of the motor shaft. The invention relates to a method for calculating the eccentric distance of an eccentric shaft of a motor by utilizing a linear spring aiming at the motor with small eccentric distance and large rated rotating speed.
Description
Technical Field
The invention mainly relates to the technical field of measuring the eccentricity of a motor shaft, in particular to a method for calculating the eccentric distance of an eccentric shaft of a motor by using a linear spring.
Background
The motor shaft must have certain eccentricity in the actual processing to lead to the motor to take place the axle vibration at the during operation, and then increase the noise and reduce the life of motor. When the eccentricity of the motor is small, the accuracy of the existing eccentricity measurement method is not enough, so that an eccentricity measurement method for a motor shaft with small eccentricity needs to be designed.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the technical problems in the prior art, the invention provides a method for calculating the eccentric distance of an eccentric shaft of a motor by utilizing a linear spring aiming at the motor with small eccentric distance and large rated rotating speed.
In order to solve the problems, the solution proposed by the invention is as follows: a method for calculating the eccentric distance of the eccentric shaft of a motor by using a linear spring comprises the following steps:
the method comprises the following steps: installing a motor on the linear spring to form a vibration system;
selecting a linear spring with a known stiffness coefficient k, and mounting a motor on the linear spring;
step two: measuring the total elastic deformation x caused by the weight of the machine0；
Measuring the total elastic deformation x0 of the linear spring under the action of the gravity of the motor by using a micrometer；
Step three, measuring the vibration acceleration α by using a sensor0；
Starting the motor to rotate at a rated speed N in a no-load way, respectively measuring m vibration points on the outer wall of the motor by using sensors, and recording the maximum acceleration of the same point
Wherein i is a vibration point number; average value of acceleration, i.e.
Step four: calculating the nominal inertia force F of the motor shaft using the measured dataI；
Using the formula FI＝(a0kx0)/ω2Calculating the rated inertia force F of the motor shaftIWherein ω ═ pi N/30 is the rated angular velocity of the motor;
step five: using rated inertia force FICalculating the eccentricity e of the motor shaft;
measuring mass m of motor shaft0Using e ═ FI/(m0ω2) And calculating the eccentricity e of the motor shaft according to a formula.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the method for calculating the eccentric distance of the eccentric shaft of the motor by using the linear spring improves the measurement precision of the eccentric inertia force and further improves the measurement precision of the eccentric distance by using the proportional relation between the vibration acceleration and the square of the rated rotating speed; meanwhile, the deviation measurement of the invention is a structure of dynamic measurement in the vibration isolation process of the linear spring, so that the motor vibration isolation protection can be better realized by using the data. Therefore, the invention discloses a method for calculating the eccentric distance of the eccentric shaft of the motor by using a linear spring aiming at the motor with small eccentric distance and large rated rotating speed.
Drawings
FIG. 1 is a flow chart of a method for calculating the eccentric distance of an eccentric shaft of a motor using a linear spring according to the present invention.
Detailed Description
The invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, the method for calculating the eccentric distance of the eccentric shaft of the motor by using the linear spring according to the present invention comprises the following steps:
referring to fig. 1, step one: installing a motor on the linear spring to form a vibration system;
referring to fig. 1, a linear spring with a known stiffness coefficient k is selected, and a motor is mounted on the linear spring;
referring to fig. 1, step two: measuring the total elastic deformation x caused by the weight of the machine0；
Referring to fig. 1, a micrometer is used for measuring the total elastic deformation x of the linear spring under the action of the gravity of the motor0；
Referring to FIG. 1, step three, measuring the vibration acceleration α with the sensor0；
Referring to fig. 1, the motor is started to rotate in a no-load mode at a rated rotation speed N, m vibration points on the outer wall of the motor are measured by using sensors respectively, and the maximum acceleration of the same point is recorded
Wherein i is a vibration point number; average value of acceleration, i.e.
Referring to fig. 1, step four: calculating the nominal inertia force F of the motor shaft using the measured dataI；
Referring to FIG. 1, using the formula FI＝(a0kx0)/ω2Calculating the rated inertia force F of the motor shaftIWherein ω ═ pi N/30 is the rated angular velocity of the motor;
referring to fig. 1, step five: using rated inertia force FICalculating the eccentricity e of the motor shaft;
referring to fig. 1, the mass m of the motor shaft is measured0Using e ═ FI/(m0ω2) And calculating the eccentricity e of the motor shaft according to a formula.
Claims (1)
1. A method for calculating the eccentric distance of an eccentric shaft of a motor by using a linear spring is characterized by comprising the following steps of:
the method comprises the following steps: installing a motor on the linear spring to form a vibration system;
selecting a linear spring with a known stiffness coefficient k, and mounting a motor on the linear spring;
step two: measuring the total elastic deformation x caused by the weight of the machine0；
Method for measuring total elastic deformation x of linear spring under action of gravity of motor by using micrometer0；
Step three: measuring the vibration acceleration a by means of a sensor0；
Starting the motor to rotate at a rated speed N in a no-load way, respectively measuring m vibration points on the outer wall of the motor by using sensors, and recording the maximum acceleration of the same point
Wherein i is a vibration point number; average value of acceleration, i.e.
Step four: calculating the nominal inertia force F of the motor shaft using the measured dataI；
Using the formula FI＝(a0kx0)/ω2Calculating the rated inertia force F of the motor shaftIWherein ω ═ pi N/30 is the rated angular velocity of the motor;
step five: using rated inertia force FICalculating the eccentricity e of the motor shaft;
measuring mass m of motor shaft0Using e ═ FI/(m0ω2) And calculating the eccentricity e of the motor shaft according to a formula.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811299932.5A CN109307499B (en) | 2018-11-02 | 2018-11-02 | Method for calculating eccentric distance of motor eccentric shaft by using linear spring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811299932.5A CN109307499B (en) | 2018-11-02 | 2018-11-02 | Method for calculating eccentric distance of motor eccentric shaft by using linear spring |
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| Publication Number | Publication Date |
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| CN109307499A CN109307499A (en) | 2019-02-05 |
| CN109307499B true CN109307499B (en) | 2020-08-14 |
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| CN201811299932.5A Active CN109307499B (en) | 2018-11-02 | 2018-11-02 | Method for calculating eccentric distance of motor eccentric shaft by using linear spring |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2859083Y (en) * | 2005-12-30 | 2007-01-17 | 黄岩余 | Low vibration high speed radial piston type pneumatic motor |
| CN106111512B (en) * | 2016-06-20 | 2018-05-04 | 吉林大学 | Eccentricity radial adjustable inertia vibration generator and its application |
| CN206206378U (en) * | 2016-09-28 | 2017-05-31 | 珠海格力节能环保制冷技术研究中心有限公司 | Two-stage Compression machine crankshaft and double-stage compressor |
| CN106763483B (en) * | 2016-12-29 | 2018-11-30 | 宜昌长机科技有限责任公司 | High speed gear shaper main motion inertia force full balanced design method automatically |
| CN107449609A (en) * | 2017-07-06 | 2017-12-08 | 同济大学 | A kind of power assembly active engine mount experimental stand |
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