CN114413725B - Method for judging stator assembly qualification on motor stator hot jacket assembly line - Google Patents
Method for judging stator assembly qualification on motor stator hot jacket assembly line Download PDFInfo
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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
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/14—Measuring arrangements characterised by the use of mechanical techniques for measuring distance or clearance between spaced objects or spaced apertures
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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
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
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Abstract
The application discloses a method for judging the assembly qualification of a stator on a motor stator hot-set assembly line, which is to pre-establish a calculation formula and a clearance qualification value range between the stator and a rotor for reference, and when the stator is assembled in a motor shell, the calculation formula can be utilized to obtain the maximum deviation of the end part of the stator relative to the rotor through measurement and calculation, and then the obtained maximum deviation is used for judging whether a product is qualified or not by comparing the clearance qualification value range. The method has the advantages that a circle concentric with the stator is drawn along the upper end face of the stator before the stator is pressed and assembled to the motor shell, after the stator is pressed and assembled to the motor shell, a measuring tool is used for finding the highest point and the lowest point on the circle through height measurement, the heights of the two points are measured, the created calculation formula can be used for calculation, and the calculation result is substituted into the judgment type to judge whether the product is qualified or not. If the empirical formula is obtained by inverse operation, the judgment can be made by calculating the difference between the highest point and the lowest point.
Description
Technical Field
The application relates to a method for judging stator assembly qualification on a motor stator hot jacket assembly line, and belongs to the technical field of motor detection.
Background
The motor is used as a power source of the electric automobile and is a core part of the electric automobile. The motor quality can affect the quality of the electric vehicle. The motor quality is not only determined by design, but also the assembly process has great influence on the motor quality. The stator hot jacket process is one of the most critical processes in motor assembly, wherein the cylindrical stator is most difficult to control and is inclined when being sleeved on a motor shell in a hot jacket mode, the coaxiality of the center line of the stator and the center line of the shell after hot jacket forming is low, and one side of the upper end and the other side of the lower end of a rotor positioned in the space in the cylindrical stator are respectively attached to or close to the inner wall of the stator, so that a phenomenon called as sweeping in the industry occurs when the rotor rotates.
In general, whether the gap between the stator and the rotor meets the design requirement can be determined by measuring the coaxiality of the stator center line and the shell center line or the perpendicularity of the stator end face and the shell center line. But the measurement of coaxiality and verticality requires a three-dimensional device to measure. Since the three-dimensional equipment is expensive and has low efficiency, the three-dimensional equipment cannot be applied to a production line, other simple and feasible detection methods are not found, and therefore, unqualified products are always detected in the final test, and other aspects of assembly are finished at the moment, so that great cost is paid.
Disclosure of Invention
The application aims to solve the technical problems that: how to timely find out the motor with the risk of sweeping the bore on the production line, and effectively improve the assembly qualification rate of the motor.
Aiming at the problems, the technical scheme provided by the application is as follows:
a method for judging the qualification of stator assembly on the motor stator hot jacket assembly line is to pre-establish a calculation formula and a clearance qualification value range between a stator and a rotor for reference, when the stator is assembled in a motor shell, the calculation formula can be utilized to obtain the maximum deviation of the end part of the stator relative to the rotor through measurement and calculation, and then the obtained maximum deviation is compared with the clearance qualification value range to judge whether the product is qualified or not.
The beneficial effects are that: only a circle concentric with the stator is drawn along the upper end surface of the stator before the stator is pressed and assembled to the motor shell, after the stator is pressed and assembled to the motor shell, a highest point and a lowest point are found on the circle through height measurement by using a measuring tool, the heights of the two points are measured (the distance between the two points is the diameter of the circle, which can be known), the created calculation formula can be used for calculation, and the calculation result is substituted into the judgment formula to judge whether the product is qualified or not.
If the calculation formula established according to the specification is used for carrying out inverse operation, an empirical formula for detecting the product with the specification can be established, and the product can be judged whether to be qualified or not only by calculating the difference value between the highest point and the lowest point when the product is applied, so that the detection is simpler and more convenient.
Drawings
FIG. 1 is a geometric view for calculation in combination with the motor housing, stator, rotor structure;
fig. 2 is a schematic top view of the upper end surface of the stator.
In the figure: 1. a motor housing; 2. a stator; 3. a rotor; 4. and (3) a circle.
Detailed Description
The application is further described below with reference to examples and figures:
as shown in fig. 1, the motor includes a rotor 3 having a columnar shape, a stator 2, and a motor housing 1. The stator 2 is provided with a cylindrical cavity, the stator 2 is pressed in the motor shell, the rotor 3 is arranged in the cylindrical cavity of the stator 2, and a gap is reserved between the outer periphery of the rotor 3 and the inner wall of the stator 2.
The hot jacket process of the stator 2 is to press the stator 2 into the motor shell 1 at high temperature, and the axial lead M of the stator 2 which is pressed is difficult to ensure to completely coincide with the axial lead N which is common to the rotor 3 and the motor shell 1 due to the thermal deformation of materials and the difference of the loading angles, namely the stator 2 is biased during the pressing.
The stator 2 is severely installed during press fitting, which can lead to the rotor 3 sweeping the bore in the cavity of the stator 2. The upper end face of the biased stator 2 is high on one side and low on the other side with respect to the upper end face of the motor housing 1. The sweeping of the rotor 3 in the cavity of the stator 2 occurs at the lower end of the side where the upper end face of the stator 2 is high and at the upper end of the side where the upper end face is low.
Since it is difficult to determine the coaxiality of the axis M of the stator 2 with the axis N common to the rotor 3 and the motor housing 1 on the shrink fit assembly line, the present application places the key of solving the problem on how to know the maximum deviation of the upper end surface of the stator 2 with respect to the rotor 3.
Example 1
The application provides a method for judging whether the stator assembly is qualified on a motor stator hot-sleeve assembly line, which is to pre-establish a calculation formula and a clearance qualification value range between a stator 2 and a rotor 3 for reference, obtain the maximum deviation of the end part of the stator 2 relative to the rotor 3 by measurement and calculation by using the calculation formula when the stator 2 is assembled in a motor shell, and judge whether a product is qualified by comparing the obtained maximum deviation with the clearance qualification value range.
The pre-established calculation formula and the gap qualification value range between the stator 2 and the rotor 3 for reference comprise the following steps:
step one, drawing a geometric view for calculation combined with a product structure:
step two, establishing a maximum deviation amount calculation formula;
step three, introducing the lowest safety coefficient, and establishing a qualification judgment formula containing a clearance qualification value range;
step four, primary inspection;
and fifthly, rechecking, and adjusting the qualified value range of the gap.
As shown in fig. 1, step one of drawing the geometric view for calculation combined with the motor structure is to draw an axial section schematic diagram of the motor housing 1, the stator 2 and the rotor 3 with the stator axis M and the rotor axis N on the section, and make the highest side and the lowest side of the upper end face of the stator 2 with respect to the upper end face of the motor housing 1 be respectively on two sides of the section schematic diagram; a measuring point A is set on the end face of the stator 2 on the lowest side, and a measuring point B is set on the end face of the stator 2 on the highest side; a straight line X connecting the upper end surfaces of the two sides of the motor shell 1 is formed, a perpendicular line AD and BE of the straight line X are formed by passing points A and B, and a straight line BC perpendicular to the straight line AD is formed by passing points B; the included angle between the line segment AB and the CB is 1; the deflection included angle of the stator axial lead M relative to the rotor axial lead N is 2; respectively marking a point H and a point K at the upper end and the lower end of a side line of the inner wall of the lowest side of the stator 2; a lower end setpoint J of the lateral line of the rotor 3 near the lowest side of the stator 2; a parallel line JF of a line segment KH is made from a point J, so that the length of the line segment KH is equal to that of the line segment JF; taking a vertical line FG of the side edge of the rotor 3 point J from the point F; the angle between the line FJ and the deflection relative to the line GJ is equal to < 3.
The step two of establishing the maximum deviation calculation formula comprises the following substeps:
a) Setting: the length of the AC is L1, the heights of the line segments AD and BE are h1 and h2 respectively, the length of the line segment AB is L2, the length of the line segment FJ is L3, and the length of the line segment FG is L4;
b) Establishing a first calculation according to substep a: l1=h1-h 2
h1 and h2 are obtained through measurement;
c) Establishing a calculation formula II according to the substep b: sin < 1=L1/L2
L2 is obtained by measurement;
d) Establishing a calculation formula three according to the substep c: angle 3= angle 1= angle 2
The angles of the same object rotating in the same direction are equal to each other for the angles 1, 2 and 3;
e) Establishing a calculation formula four according to the substep d: l4=sin +.3×l3
L3 is the height of the known stator;
the L4 is the maximum deviation of the end of the stator 2 with respect to the rotor 3.
It is to be noted that L4 represents the length of the line segment FG for the convenience of drawing and calculation, and in practice, L4 represents the offset from the upper end surface point H of the stator 2 to the point I of the rotor 3, and since the distance from the point H to the point I is the maximum distance from the upper end surface of the stator 2 to the rotor 3, the offset from the upper end surface point H of the stator 2 to the point I of the rotor 3 is the maximum offset from the end of the stator 2 with respect to the rotor 3 described herein.
And step three, introducing the lowest safety coefficient, and establishing a qualification judgment formula comprises the following substeps:
f) Knowing σ as the ideal gap designed (the gap where the spacing between the outer periphery of the rotor 3 and the inner wall of the stator 2 is equal), the lowest safety factor n is introduced, n e (0, 1) is set, and n values are typically set to 0.3, 0.4, 0.5.
g) Determining a qualified judgment formula: L4E [ sigma, n x sigma ]
And when the L4 value falls into a gap qualified value range [ sigma, n multiplied by sigma ], judging that the product is qualified.
The primary detection in the fourth step comprises the following sub-steps:
i) Measurement: measuring line segments AD, BE and AB respectively, and obtaining values of h1, h2 and L2;
j) And (3) calculating: calculating according to the values of h1, h2 and L2 measured in the step i and the known value of L3 by using a first calculation formula, a second calculation formula, a third calculation formula and a fourth calculation formula in sequence to obtain a value of the maximum deviation L4;
k) And (5) qualification judgment: and (3) comparing the L4 value obtained in the step j by utilizing a judgment formula L4E [ sigma, n multiplied by sigma ], and if the L4 value falls into a gap qualified value range [ sigma, n multiplied by sigma ], the primary inspection product is qualified, otherwise, the primary inspection is unqualified.
In n.epsilon. (0, 1) () indicates that both ends are not included, i.e., 0 and 1 are not included, as is the case in full text.
In [ sigma, n x sigma ], the expression [ ] includes both ends, i.e. includes sigma and n x sigma, and the meaning of [ ] is the same throughout.
As shown in fig. 1 and 2, in the fourth step, the values of h1, h2 and L2 are obtained by measuring the line segments AD, BE and AB in the step i respectively, wherein before assembly, a circle 4 is drawn on the end face of the stator 2, so that the center of the circle is located on the axis of the stator 2, and the diameter of the circle 4 is accurately measured; after the stator 2 is pressed, different points are selected on the circle 4 to measure the vertical height from the points to the top end surface of the motor shell 1, and the measuring point of the maximum height h1 is taken as the lowest point A of the circle 4; taking the measuring point of the minimum height value h2 as the highest point B of the circle 4; since points a and B are the lowest and highest points on the circle, respectively, the line segment from point a to point B must cross the center of circle 4, and the length L2 of line segment AB is the diameter of circle 4.
Fifthly, rechecking the products subjected to the primary detection in the fourth step by using a three-coordinate device, and when unqualified products are missed, increasing the value of the lowest safety coefficient n; when a good product is considered as a bad product, the value of the lowest safety factor n is adjusted down, thereby obtaining a reliable clearance good value range for reference when later used in assembly line inspection.
Through the steps, a first calculation formula, a second calculation formula, a third calculation formula, a fourth calculation formula and a judgment formula which can be directly applied are obtained, and the clearance fit value range in the judgment formula is a reliable clearance fit value range determined through rechecking.
In practical application, the method is also adopted to measure firstly, namely, before assembly, a circle 4 is drawn on the end face of the stator 2, so that the center of the circle is positioned on the axis of the stator 2, and the diameter of the circle 4 is accurately measured; after the stator 2 is pressed, the measuring tool is preferably a high-precision measuring tool with data display, namely a lowest point A and a highest point B on a circle 4, and then the heights h1 and h2 of the points A and B relative to the upper end surface of the motor shell are respectively measured; the length L2 from point a to point B is the diameter of circle 4. Thus, we obtain values for h1, h2, L2. Then, whether the stator assembly is qualified or not can be judged on the motor stator hot jacket assembly line by using the first, second, third, fourth and judging formulas.
For products of the same specification, the size of the circle 4 drawn on the end face of the stator 2 before assembly can be fixed, so that the diameter is measured once, the value of L2 is directly obtained in the subsequent application, and h1 and h2 are obtained by measuring the lowest point A and the highest point B, so that the detection becomes very convenient.
Example two
As shown in fig. 1 and 2, a method for determining the qualification of stator assembly on a motor stator hot jacket assembly line is different from the first embodiment in that: and performing inverse operation according to the gap qualified value range [ sigma, n multiplied by sigma ] of the L4 determined after the recheck by using the acquired first calculation formula, second calculation formula, third calculation formula and fourth calculation formula to acquire an empirical formula for simplifying operation, wherein the method comprises the following steps of:
step 1: l4=n×σ is calculated by using the calculation formula four, the calculation formula three, the calculation formula two, and the calculation formula one in this order, and l1=x is obtained.
Let l4=σ, calculate using calculation formula four, calculation formula three, calculation formula two, calculation formula one in order, obtain l1=y;
step 2: creating a qualified value range [ x, y ] of L1 according to the step 1;
step 3: since l1=h1-h 2, from the 2 nd step pass value range [ x, y ], an empirical formula is created:
h1 - h2∈[x，y]
when the values of h1-h2 fall into the qualified value range [ x, y ], the product is judged to be qualified, otherwise, the product is judged to be unqualified.
The steps are briefly described as follows:
sin∠3=L3/L4
∠1=∠2=∠3
L1=sin∠1× L2
since l1=h1-h 2
h1 – h2=sin∠1× L2
When sin < 1×L2 is n×σ substituted into L4 in sin < 3=L3/L4, the calculated value is x,
h1 – h2=x；
when sin < 1×L2 is sigma substituted into L4 in sin < 3=L3/L4, the calculated value is y,
h1 – h2=y，
that is, when h 1-h2=x, the product is acceptable,
the product is acceptable when h1-h2=y,
since n E (0, 1), and x and y are positive values, x is obtained by substituting n x sigma, y is obtained by substituting sigma,
therefore, x < y,
from this, a range of acceptable values x, y for h1-h2 can be created,
thus obtaining an empirical formula for judging the qualification of the product: h1-h 2E [ x, y ]
Compared with the first embodiment, the method can utilize the empirical formulas h1-h 2E [ x, y ] to calculate and detect only by measuring and obtaining the values of h1 and h2, so that multiple operations in the first embodiment are omitted, and the detection is more convenient. However, the empirical formula h1-h2 e [ x, y ] in this embodiment is obtained by the inverse calculation of the first embodiment, and thus the first embodiment and the second embodiment are indistinguishable in terms of the arithmetic relationship.
Meanwhile, it should be noted that, the qualified value range [ x, y ] of the second embodiment is determined by the technical parameters of a product with a certain specification, and can only be applied to the detection of the product. That is, the products with different specifications need to be respectively processed in inverse operation to obtain the qualified value ranges [ x, y ], because the technical parameters of the products with different specifications are different, such as the value of the stator height L3 is different.
The above embodiments are only for the purpose of more clearly describing the present application and should not be construed as limiting the scope of the present application, and any equivalent modifications should be construed as falling within the scope of the present application.
Claims (6)
1. A method for judging stator assembly qualification on motor stator hot-set assembly line is characterized in that a calculation formula and a clearance qualification value range between a stator (2) and a rotor (3) for reference are established in advance, when the stator (2) is assembled in a motor shell, the maximum deviation of the end part of the stator (2) relative to the rotor (3) can be obtained through measurement and calculation by using the calculation formula, and then whether a product is qualified is judged by comparing the obtained maximum deviation with the clearance qualification value range; the pre-established calculation formula and the clearance qualification value range between the stator (2) and the rotor (3) for reference comprise the following steps:
step one, drawing a geometric view for calculation combined with a product structure:
step two, establishing a maximum deviation amount calculation formula;
step three, introducing the lowest safety coefficient, and establishing a qualification judgment formula containing a clearance qualification value range;
step four, primary inspection;
fifthly, rechecking, and adjusting the range of the qualified value of the gap;
drawing a geometric view for calculation combined with a product structure, namely drawing an axial section schematic diagram of a motor shell (1), a stator (2) and a rotor (3) of a stator axial lead M and a rotor axial lead N on a section, and enabling the highest side and the lowest side of the upper end face of the stator (2) which is installed in a deflection relative to the upper end face of the motor shell (1) to be respectively on two sides of the section schematic diagram; a measuring point A is set on the end face of the stator (2) at the lowest side, and a measuring point B is set on the end face of the stator (2) at the highest side; a straight line X connecting the upper end surfaces of the two sides of the motor shell (1) is formed, a perpendicular line AD and BE of the straight line X are formed by passing points A and B, and a straight line BC perpendicular to the straight line AD is formed by passing points B; the included angle between the line segment AB and the CB is 1; the deflection included angle of the stator axial lead M relative to the rotor axial lead N is 2; the upper end and the lower end of a lateral line of the inner wall at the lowest side of the stator (2) are respectively marked with a point H and a point K; a lower end setpoint J of the side line of the rotor (3) near the lowest side of the stator (2); a parallel line JF of a line segment KH is made from a point J, so that the length of the line segment KH is equal to that of the line segment JF; taking the point F as a vertical line FG of the side edge of the point J of the rotor (3); the deflection included angle between the line segment FJ and the line segment GJ is 3;
the step two of establishing the maximum deviation calculation formula comprises the following substeps:
a) Setting: the length of the AC is L1, the heights of the line segments AD and BE are h1 and h2 respectively, the length of the line segment AB is L2, the length of the line segment FJ is L3, and the length of the line segment FG is L4;
b) Establishing a first calculation according to substep a: l1=h1-h 2
h1 and h2 are obtained through measurement;
c) Establishing a calculation formula II according to the substep b: sin < 1=L1/L2
L2 is obtained by measurement;
d) Establishing a calculation formula three according to the substep c: angle 3= angle 1= angle 2
The angles of the same object in the same direction are all 1, 2 and 3;
e) Establishing a calculation formula four according to the substep d: l4=sin +.3×l3
L3 is the height of the known stator;
the L4 is the maximum deviation of the end part of the stator (2) relative to the rotor (3);
and step three, introducing the lowest safety coefficient, and establishing a qualification judgment formula comprises the following substeps:
f) Knowing σ as the ideal gap of the design, introducing the lowest safety factor n, setting n ε (0, 1)
g) Determining a qualified judgment formula: L4E [ sigma, n x sigma ]
And when the L4 value falls into a gap qualified value range [ sigma, n multiplied by sigma ], judging that the product is qualified.
2. The method of claim 1, wherein the primary inspection in step four comprises the sub-steps of:
i) Measurement: measuring line segments AD, BE and AB respectively, and obtaining values of h1, h2 and L2;
j) And (3) calculating: calculating according to the values of h1, h2 and L2 measured in the step i and the known value of L3 by using a first calculation formula, a second calculation formula, a third calculation formula and a fourth calculation formula in sequence to obtain a value of the maximum deviation L4;
k) And (5) qualification judgment: and (3) comparing the L4 value obtained in the step j by utilizing a judgment formula L4E [ sigma, n multiplied by sigma ], and if the L4 value falls into a gap qualified value range [ sigma, n multiplied by sigma ], the primary inspection product is qualified, otherwise, the primary inspection is unqualified.
3. The method for judging whether the stator assembly is qualified on the motor stator hot jacket assembly line according to claim 2, wherein the rechecking in step five, adjusting the clearance qualification value range is to recheck the product subjected to the primary inspection in step four by using a three-coordinate device, and when the unqualified product is missed, adjusting the value of the lowest safety factor n; when a good product is considered as a bad product, the value of the lowest safety factor n is adjusted down, thereby obtaining a reliable clearance good value range for reference when later used in assembly line inspection.
4. A method of determining whether a product is acceptable or not in a motor stator hot-set assembly line according to claim 3, wherein the maximum deviation obtained is used to determine whether the product is acceptable or not against a gap acceptance value range by using an acceptance determination formula l4 e [ σ, n x σ ], wherein [ σ, n x σ ] is a reliable gap acceptance value range determined by a recheck.
5. The method for determining the assembly qualification of a stator on a motor stator hot-set assembly line according to claim 4, wherein in the fourth step, the line segments AD, BE and AB are respectively measured in the step i to obtain values of h1, h2 and L2, before the assembly, a circle (4) is drawn on the end face of the stator (2) so that the center of the circle is positioned on the axis of the stator (2), and the diameter of the circle (4) is accurately measured; after the stator (2) is pressed and assembled, different points are selected on the circle (4) by using a measuring tool, the vertical height from the points to the top end surface of the motor shell (1) is measured, and the measuring point of the maximum height h1 is taken as the lowest point A of the circle (4); taking the measuring point of the minimum height value h2 as the highest point B of the circle (4); the line segment from the point A to the point B crosses the circle center of the circle (4), and the length L2 of the line segment AB is the diameter of the circle (4).
6. The method for determining stator assembly qualification on a motor stator hot jacket assembly line according to claim 3, wherein the inverse operation is performed by using the obtained first, second, third, fourth calculation according to the gap qualification value range [ σ, n x σ ] of L4 determined after the re-inspection, and an empirical formula for simplifying the operation is obtained, comprising the steps of:
step 1: let l4=n×σ, calculate using calculation formula four, calculation formula three, calculation formula two, calculation formula one in order to obtain l1=x;
let l4=σ, calculate using calculation formula four, calculation formula three, calculation formula two, calculation formula one in order, obtain l1=y;
step 2: creating a qualified value range [ x, y ] of L1 according to the step 1;
step 3: since l1=h1-h 2, from the 2 nd step pass value range [ x, y ], an empirical formula is created:
h1 - h2∈[x，y]
when h1-h2 falls into the qualified value range [ x, y ], the product is judged to be qualified, otherwise, the product is judged to be unqualified.
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