CN107478939B - Method and device for detecting symmetry of stator winding of motor - Google Patents
Method and device for detecting symmetry of stator winding of motor Download PDFInfo
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- CN107478939B CN107478939B CN201710917696.8A CN201710917696A CN107478939B CN 107478939 B CN107478939 B CN 107478939B CN 201710917696 A CN201710917696 A CN 201710917696A CN 107478939 B CN107478939 B CN 107478939B
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- 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
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- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
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Abstract
The invention discloses a method and a device for detecting the symmetry of a stator winding of a motor, wherein the number of parallel branches of each phase of stator winding of the motor is more than 1, and the method for detecting the symmetry comprises the following steps: when each stator winding of the motor is sequentially connected in series along the circumferential direction of a stator of the motor to form a series circuit and a rotor matched with the stator is controlled to rotate, detecting the current value in the series circuit; and judging whether each phase of stator winding of the motor is symmetrical or not according to the current value in the series loop. The detection method can utilize the winding to form a detection circuit, carries out winding symmetry judgment on the motor with non-unique number of parallel branches, is simple and clear, and is suitable for stator winding symmetry detection in the large-scale production process.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a method and a device for detecting the symmetry of a stator winding of a motor.
Background
With the widespread use of some devices (such as electric vehicles, electric tools, etc.) using batteries, motors and driving devices that generate large power under a limited voltage of the batteries are also used in large quantities. Generally, since the battery voltage is limited to a small range, such as 24V, 48V, etc., the corresponding motor also has the characteristic of low voltage and large current, and therefore, a high number of parallel branches and (or) delta connection windings are required to improve the voltage utilization rate.
However, the above method has a high requirement on the symmetry of the motor winding, and if there is a certain asymmetry between the two parallel coils, for example, the two parallel coils have different specifications or are asymmetric in position, a voltage difference is formed between the two coils, and then a strong circulating current is formed due to a small winding resistance, which affects the performance of the motor and causes abnormal temperature rise, resulting in a reduced motor life.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the art described above. Therefore, a first object of the present invention is to provide a method for detecting symmetry of stator windings of a motor, which can utilize the windings to form a detection circuit, and perform winding symmetry judgment on a motor with a non-unique number of parallel branches, and the detection method is simple and clear, and is suitable for symmetry detection in a large-scale production process.
A second object of the present invention is to provide a device for detecting symmetry of stator windings of an electric machine.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a method for detecting symmetry of stator windings of a motor, where the number of parallel branches of each phase of stator winding of the motor is greater than 1, and the method includes the following steps: sequentially connecting each stator winding of the motor in series along the circumferential direction of a stator of the motor to form a series circuit, and detecting a current value in the series circuit when controlling a rotor matched with the stator to rotate; and judging whether each phase of stator winding of the motor is symmetrical or not according to the current value in the series loop.
According to the method for detecting the symmetry of the stator windings of the motor, when the stator windings of the motor are sequentially connected in series along the circumferential direction of the stator of the motor to form a series circuit and a rotor matched with the stator is controlled to rotate, the current value in the series circuit is detected, and then whether the stator windings of each phase of the motor are symmetrical or not is judged according to the current value in the series circuit. Therefore, the method can utilize the winding to form a detection circuit, the symmetry of the winding is judged for the motor with non-unique number of parallel branches, and the detection method is simple and clear and is suitable for symmetry detection in the large-scale production process.
In addition, the stator winding symmetry detection method proposed according to the above embodiment of the present invention may further have the following additional technical features:
according to one embodiment of the present invention, judging whether each phase of stator winding of the motor is symmetrical according to the current value in the series loop comprises: judging whether the current value in the series circuit is smaller than a preset threshold value or not; if the current value in the series loop is smaller than the preset threshold value, judging that each phase of stator winding of the motor is symmetrical; and if the current value in the series loop is greater than or equal to the preset threshold value, judging that at least one phase of stator winding of the motor is asymmetric.
According to an embodiment of the present invention, the preset threshold may be 0.
According to one embodiment of the invention, the current value in the series circuit is detected by switching in a current detection device in the series circuit.
In order to achieve the above object, a second aspect of the present invention provides a symmetry detection apparatus for a stator winding of an electric machine, where the number of parallel branches of each phase of the stator winding of the electric machine is greater than 1, the symmetry detection apparatus comprising: the current detection module is used for sequentially connecting each stator winding of the motor in series along the circumferential direction of the stator of the motor to form a series loop and detecting the current value in the series loop when controlling the rotor matched with the stator to rotate; and the judging module is used for judging whether each phase of stator winding of the motor is symmetrical or not according to the current value in the series loop.
According to the stator winding symmetry detection device of the motor, when all the stator windings of the motor are sequentially connected in series along the circumferential direction of the stator of the motor to form a series circuit and the rotor matched with the stator is controlled to rotate, the current detection module detects the current value in the series circuit, and the judgment module judges whether all the stator windings of each phase of the motor are symmetrical or not according to the current value in the series circuit. Therefore, the device can utilize the winding to form a detection circuit, carry out winding symmetry judgment on the motor with non-unique number of parallel branches, and the detection method is simple and clear and is suitable for symmetry detection in the large-scale production process.
In addition, the stator winding symmetry detection device of the motor according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the determining module is configured to determine whether a current value in the series circuit is smaller than a preset threshold, determine that each phase of stator winding of the motor is symmetrical when the current value in the series circuit is smaller than the preset threshold, and determine that at least one phase of stator winding of the motor is asymmetrical when the current value in the series circuit is greater than or equal to the preset threshold.
According to an embodiment of the present invention, the preset threshold may be 0.
According to one embodiment of the invention, the current detection module comprises a current detection device connected in the series circuit.
Drawings
Fig. 1 is a flow chart of a stator winding symmetry detection method of an electric machine according to an embodiment of the invention;
FIG. 2 is a connection diagram of a stator winding symmetry testing circuit of an electric machine according to one embodiment of the present invention;
fig. 3 is a block schematic diagram of a stator winding symmetry detection apparatus of an electric machine according to an embodiment of the present invention.
Reference numerals:
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A stator winding symmetry detection method of a motor and a stator winding symmetry detection apparatus of a motor according to an embodiment of the present invention are described below with reference to the accompanying drawings.
Fig. 1 is a flowchart of a stator winding symmetry detection method of an electric machine according to an embodiment of the present invention. In an embodiment of the invention, the number of parallel branches per phase of stator winding of the electrical machine is greater than 1.
As shown in fig. 1, the method for detecting symmetry of stator winding of an electric machine according to an embodiment of the present invention may include the following steps:
and S1, when each stator winding of the motor is connected in series in turn along the circumferential direction of the stator of the motor to form a series loop, and the rotor matched with the stator is controlled to rotate, detecting the current value in the series loop.
In one embodiment of the invention, the current value in the series circuit is detected by switching in a current detection device in the series circuit.
Specifically, the head end of each winding and the tail end of the adjacent winding are sequentially connected in the circumferential direction of the stator of the motor so that all the windings form a series circuit (loop circuit), and a current detection device is connected in series in the series circuit. A counter electromotive force is generated in each stator winding by a rotating magnetic field generated by rotation of the rotor having a number of poles matching the number of stator windings, so that a current can be formed in the series circuit. The value of the current in the series circuit is obtained by taking a stable reading on the current detection device.
Take a six-slot four-pole motor with 2 parallel branches as an example. As shown in fig. 2, the motor may include a stator core and windings wound around the teeth, each winding having connecting leads connected end to end in sequence along a circumference to form a loop, a rotor rotates clockwise to generate a rotating magnetic field, and a counter electromotive force is generated in each winding, wherein a counter electromotive force generated in the a-phase winding coils a1 and a2 is Ua ═ cos (ω t), a counter electromotive force generated in the B-phase winding coils B1 and B2 is Ub ═ cos (ω t-2 pi/3), a counter electromotive force generated in the C-phase winding coils C1 and C2 is Uc ═ cos (ω t +2 pi/3), and a current detecting device (e.g., an ammeter) is connected in series in the loop.
And S2, judging whether each phase of stator winding of the motor is symmetrical according to the current value in the series circuit.
According to one embodiment of the invention, judging whether each phase of stator winding of the motor is symmetrical according to the current value in the series loop comprises the following steps: and judging whether the current value in the series circuit is smaller than a preset threshold value or not, if so, judging that each phase of stator winding of the motor is symmetrical, and if not, judging that at least one phase of stator winding of the motor is asymmetrical. The preset threshold may be calibrated according to actual conditions, for example, the preset threshold may be 0, or may be a value close to 0 set according to process requirements.
Specifically, after the current value in the series circuit is acquired, it is determined. When the current value is smaller than a preset threshold (such as 0 or a value close to 0), the symmetry of the winding is judged to be qualified, otherwise, the symmetry of at least one phase of stator winding is judged to be unqualified (asymmetric).
Also taking the motor shown in fig. 2 as an example, the theoretical voltage between two points is Ua + Ub + Uc is 0V when the stator windings are symmetrical, and is independent of the rotation speed of the rotor, so the corresponding loop current value is 0/R is 0A (where R is the resistance value after all windings are connected in series). Considering the process error, the judgment value can be amplified to a certain threshold value close to zero, if the current reading is lower than the preset threshold value, the symmetry of the stator winding is judged to be qualified, and if the current reading is larger than or equal to the preset threshold value, the symmetry of the stator winding is judged to be unqualified.
Therefore, the method for detecting the symmetry of the stator winding of the motor in the embodiment of the invention constructs the test circuit by utilizing the voltage symmetry characteristic of the symmetrical winding, judges the symmetry of the winding of the motor with non-unique number of parallel branches, is simple and clear, and is suitable for detecting the symmetry of the stator winding in the large-scale production process.
In summary, according to the method for detecting symmetry of stator windings of a motor in an embodiment of the present invention, when each stator winding of the motor is sequentially connected in series along a circumferential direction of the stator of the motor to form a series circuit and a rotor matched with the stator is controlled to rotate, a current value in the series circuit is detected, and then whether each phase of stator winding of the motor is symmetric is determined according to the current value in the series circuit. Therefore, the method can utilize the winding to form a detection circuit, the symmetry of the winding is judged for the motor with non-unique number of parallel branches, and the detection method is simple and clear and is suitable for symmetry detection in the large-scale production process.
Fig. 3 is a block schematic diagram of a stator winding symmetry detection apparatus of an electric machine according to an embodiment of the present invention. In an embodiment of the invention, the number of parallel branches per phase of stator winding of the electrical machine is greater than 1.
As shown in fig. 3, the apparatus for detecting symmetry of a stator winding of a motor according to an embodiment of the present invention may include: a current detection module 100 and a judgment module 200. The current detection module 100 is configured to detect a current value in a series circuit when each stator winding of the motor is sequentially connected in series along a circumferential direction of a stator of the motor to form the series circuit and a rotor matched with the stator is controlled to rotate. The judging module 200 is configured to judge whether each phase of stator winding of the motor is symmetrical according to a current value in the series circuit.
According to one embodiment of the invention, the current sensing module 200 may include a current sensing device 42 connected in a series loop.
According to an embodiment of the present invention, the determining module 200 is configured to determine whether a current value in the series circuit is smaller than a preset threshold, determine that each phase of stator winding of the motor is symmetrical when the current value in the series circuit is smaller than the preset threshold, and determine that at least one phase of stator winding of the motor is asymmetrical when the current value in the series circuit is greater than or equal to the preset threshold. The preset threshold may be 0.
Specifically, the head end of each winding and the tail end of the adjacent winding are sequentially connected in the circumferential direction of the stator of the motor so that all the windings form a series circuit (loop circuit), and a current detection device is connected in series in the series circuit. A counter electromotive force is generated in each stator winding by a rotating magnetic field generated by rotation of the rotor having a number of poles matching the number of stator windings, so that a current can be formed in the series circuit. The current detection module 100 can obtain the current value in the series circuit by reading the stable reading on the current detection device 42 in the series circuit.
After the current value in the series circuit is obtained, the determination module 200 determines it. When the current value is smaller than a preset threshold (e.g., 0, or a value close to 0), the determining module 200 determines that the symmetry of the winding is qualified, otherwise, the determining module 200 determines that the symmetry of at least one phase of the stator winding is not qualified (asymmetric).
Take a six-slot four-pole motor with 2 parallel branches as an example. As shown in fig. 2, the motor may include a stator core 10 and windings 20 wound around each tooth, each winding 20 is connected end to end in sequence along a circumference with connecting leads 41 to form a loop, a rotor 30 rotates clockwise to generate a rotating magnetic field, and a counter electromotive force is generated in each winding, where a counter electromotive force generated in a-phase winding coil a1 and a2 is Ua ═ cos (ω t), a counter electromotive force generated in a B-phase winding coil B1 and B2 is Ub ═ cos (ω t-2 pi/3), a counter electromotive force generated in a C-phase winding coil C1 and C2 is Uc ═ cos (ω t +2 pi/3), and a current detection device 42 (e.g., an ammeter) is connected in series in the loop. In the case of stator winding symmetry, the theoretical voltage between two points is Ua + Ub + Uc equal to 0V, and is independent of the rotational speed of the rotor, so the corresponding loop current value is 0/R equal to 0A (where R is the resistance value after all windings are connected in series). Considering the process error, the judgment value can be amplified to a certain threshold value close to zero, if the current reading is lower than the preset threshold value, the judgment module 200 judges that the symmetry of the stator winding is qualified, and if the current reading is greater than or equal to the preset threshold value, the judgment module 200 judges that the symmetry of the stator winding is unqualified.
Therefore, the device for detecting the symmetry of the stator winding of the motor in the embodiment of the invention constructs the test circuit by utilizing the voltage symmetry characteristic of the symmetrical winding, judges the symmetry of the winding of the motor with non-unique number of parallel branches, has simple and clear detection method and is suitable for detecting the symmetry of the stator winding in the large-scale production process.
It should be noted that details that are not disclosed in the stator winding symmetry detection apparatus of the motor according to the embodiment of the present invention refer to details that are disclosed in the stator winding symmetry detection method of the motor according to the embodiment of the present invention, and detailed description thereof is omitted here.
According to the stator winding symmetry detection device of the motor, when all the stator windings of the motor are sequentially connected in series along the circumferential direction of the stator of the motor to form a series circuit and the rotor matched with the stator is controlled to rotate, the current detection module detects the current value in the series circuit, and the judgment module judges whether all the stator windings of each phase of the motor are symmetrical or not according to the current value in the series circuit. Therefore, the device can utilize the winding to form a detection circuit, carry out winding symmetry judgment on the motor with non-unique number of parallel branches, and the detection method is simple and clear and is suitable for symmetry detection in the large-scale production process.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. A symmetry detection method for a motor stator winding is characterized in that the number of parallel branches of each phase of the motor stator winding is more than 1, and the symmetry detection method comprises the following steps:
sequentially connecting each stator winding of the motor in series along the circumferential direction of a stator of the motor to form a series circuit, and detecting a current value in the series circuit when controlling a rotor matched with the stator to rotate;
and judging whether each phase of stator winding of the motor is symmetrical or not according to the current value in the series loop.
2. The method for detecting the symmetry of the stator windings of the motor according to claim 1, wherein judging whether the stator windings of each phase of the motor are symmetrical according to the current value in the series circuit comprises:
judging whether the current value in the series circuit is smaller than a preset threshold value or not;
if the current value in the series loop is smaller than the preset threshold value, judging that each phase of stator winding of the motor is symmetrical;
and if the current value in the series loop is greater than or equal to the preset threshold value, judging that at least one phase of stator winding of the motor is asymmetric.
3. The method of claim 2, wherein the predetermined threshold is a threshold approaching zero.
4. The symmetry detection method for a stator winding of an electric machine according to any one of claims 1 to 3, characterized in that the current value in the series circuit is detected by switching in a current detection device in the series circuit.
5. A stator winding symmetry detection device of a motor is characterized in that the number of parallel branches of each phase of stator winding of the motor is more than 1, and the symmetry detection device comprises:
the current detection module is used for sequentially connecting each stator winding of the motor in series along the circumferential direction of the stator of the motor to form a series loop and detecting the current value in the series loop when controlling the rotor matched with the stator to rotate;
and the judging module is used for judging whether each phase of stator winding of the motor is symmetrical or not according to the current value in the series loop.
6. The apparatus of claim 5, wherein the determining module is configured to determine whether a current value in the series circuit is smaller than a preset threshold, determine that each phase of the stator winding of the motor is symmetrical when the current value in the series circuit is smaller than the preset threshold, and determine that at least one phase of the stator winding of the motor is asymmetrical when the current value in the series circuit is greater than or equal to the preset threshold.
7. The apparatus of claim 6, wherein the predetermined threshold is a threshold approaching zero.
8. The stator winding symmetry detection apparatus of an electric machine according to any of claims 5-7, characterized in that the current detection module comprises a current detection device incorporated in the series circuit.
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| CN201710917696.8A CN107478939B (en) | 2017-09-30 | 2017-09-30 | Method and device for detecting symmetry of stator winding of motor |
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| CN201710917696.8A CN107478939B (en) | 2017-09-30 | 2017-09-30 | Method and device for detecting symmetry of stator winding of motor |
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| CN107478939B true CN107478939B (en) | 2020-02-11 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201365179Y (en) * | 2009-02-26 | 2009-12-16 | 山东大学 | Three-winding single-phase induction motor with novel connection |
| CN105572477A (en) * | 2014-10-14 | 2016-05-11 | 北京谊安医疗系统股份有限公司 | Method and apparatus for measuring winding resistors of brushless direct-current motor, and early warning method |
| CN106483459A (en) * | 2016-09-22 | 2017-03-08 | 河海大学 | Electric automobile permanent-magnetic synchronous motor stator unbalanced fault diagnostic method |
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2017
- 2017-09-30 CN CN201710917696.8A patent/CN107478939B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201365179Y (en) * | 2009-02-26 | 2009-12-16 | 山东大学 | Three-winding single-phase induction motor with novel connection |
| CN105572477A (en) * | 2014-10-14 | 2016-05-11 | 北京谊安医疗系统股份有限公司 | Method and apparatus for measuring winding resistors of brushless direct-current motor, and early warning method |
| CN106483459A (en) * | 2016-09-22 | 2017-03-08 | 河海大学 | Electric automobile permanent-magnetic synchronous motor stator unbalanced fault diagnostic method |
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