CN219590496U - Three-dimensional detection device for measuring motor magnetic field - Google Patents

Abstract

The utility model discloses a three-dimensional detection device for measuring a motor magnetic field, and relates to the technical field of motor magnetic field measurement devices. The utility model is provided with two pairs of X, Y, Z expanding arms which are mutually perpendicular in pairs, the detecting coils with the same number of turns are wound on each expanding arm, the detecting coils in pairs on the same axis are connected together, and the origin points of the detecting coils in the X, Y, Z directions are coincident with the center point of the center cube. According to the utility model, the two pairs of expansion arms X, Y, Z in three directions which are perpendicular to each other are adopted to form an integral three-dimensional detection device, the origins of the detection coils in the two pairs X, Y, Z in three directions are coincident with the center point of the center cube to form strict two-to-two perpendicular magnetic fields, so that the measurement accuracy of the magnetic fields is improved, the pairs of detection coils on the same axis are connected together to jointly detect a magnetic field in a certain axial direction, the detection signals are enhanced, signal interference is avoided, and weaker magnetic fields are detected advantageously.

Description

Three-dimensional detection device for measuring motor magnetic field

Technical Field

The utility model relates to the technical field of motor magnetic field measuring devices, in particular to a three-dimensional detecting device for measuring a motor magnetic field.

Background

For large generators, particularly large turbine generator end regions, negligible leakage flux in the motor can create large eddy currents and inter-chip voltages and affect losses and temperature distribution within the motor. Therefore, a developer must understand that the change of the operating condition or geometry of the motor affects the distribution of the magnetic field, the performance parameters of the motor, etc., and then perform motor design development.

And the measurement of the motor magnetic field is a premise for further understanding and improving the broader theory and experimental study of the large-scale motor. The motor end part has a complex structure, the magnetic circuit of the end part magnetic field is complex, and the current measuring means of the motor magnetic field is single; a set of detection coils is used for testing the magnetic field in a certain direction, and three sets of detection coils in three directions are needed for the three-dimensional magnetic field of the motor.

The utility model discloses a magnetic measuring element for measuring the magnetic induction intensity of a three-dimensional magnetic field, which achieves the purpose of measuring the three-dimensional magnetic field and determining the magnetic induction intensity by using the magnetic measuring element, and mainly comprises the following steps of: the central cube, the x-direction framework, the y-direction framework, the z-direction framework, the x-direction coil, the y-direction coil and the z-direction coil are respectively provided with azimuth taper hole taper pins for positioning three magnet measuring coils in the x, y and z directions; a central cube and three bobbins of wound coils: the material is insulating bakelite; three coils in x-direction, y-direction and z-direction: and winding three coils of 400 turns on the three frameworks respectively by using enameled wires with phi of 0.05mm, and calibrating the coils after winding the coils.

The magnetic measuring element of the three-dimensional magnetic field magnetic induction intensity in the prior art comprises three frameworks in the x direction, the y direction and the z direction, on one hand, the magnetic measuring element is limited by the installation space of the three frameworks, the winding turns of the coils are limited, the weaker magnetic field is not easy to detect, and on the other hand, the centers of the coils wound on the three stretching arms are not at the same point, a strict two-to-two perpendicular magnetic field cannot be formed, the measurement accuracy of the magnetic field is influenced, and the error is larger.

Disclosure of Invention

In order to overcome the defects and shortcomings in the prior art, the utility model provides a three-dimensional detection device for measuring the magnetic field of a motor, and aims to solve the problems that the existing side magnetic element cannot detect a weaker magnetic field and the measurement error is large. The three-dimensional detection device for measuring the magnetic field of the motor is provided with two pairs of cylindrical expansion arms X, Y, Z in three directions, wherein the two pairs of cylindrical expansion arms are perpendicular to each other, enameled wires with the same number of turns are wound on each expansion arm to serve as detection coils, the detection coils in pairs on the same axis are connected together, and the origins of the detection coils in the three directions of the two pairs of X, Y, Z coincide with the center point of a center cube. The utility model adopts the cylindrical expanding arms in two pairs of X, Y, Z directions which are mutually perpendicular to each other to form an integral three-dimensional detection device, the origins of the detection coils in two pairs of X, Y, Z directions are coincident with the center point of the center cube to form strict two-to-two perpendicular magnetic fields, the measurement accuracy of the magnetic fields is improved, the errors are reduced, the pairs of detection coils on the same axis are connected together, the detection of a certain axial magnetic field is carried out jointly, the detection signals are enhanced, the signal interference is avoided, and the detection of a weaker magnetic field is facilitated.

In order to solve the problems in the prior art, the utility model is realized by the following technical scheme.

The utility model provides a three-dimensional detection device for measuring a motor magnetic field, which comprises a three-dimensional detection element, wherein the three-dimensional detection element comprises a center cube, an X-direction expanding arm, a Y-direction expanding arm and a Z-direction expanding arm, and is characterized in that: the X-direction spreading arm takes the center point of the center cube as an origin and comprises a pair of spreading arms in the X direction and the-X direction, the Y-direction spreading arm takes the center point of the center cube as the origin and comprises a pair of spreading arms in the Y direction and the-Y direction, the Z-direction spreading arm takes the center point of the center cube as the origin and comprises a pair of spreading arms in the Z direction and the-Z direction, and the axes of the X-direction spreading arm, the Y-direction spreading arm and the Z-direction spreading arm are perpendicular to each other and intersect at the center point of the center cube; enameled wires with the same number of turns are wound on a pair of extending arms of the X-direction extending arm, the Y-direction extending arm and the Z-direction extending arm to serve as detection coils, the pair of detection coils on the same axis are connected together, and the origins of the detection coils on the X-direction extending arm, the Y-direction extending arm and the Z-direction extending arm coincide with the center point of the center cube.

Further preferably, coaxial shaft holes are formed in a pair of the extending arms in the X direction, the Y direction and the Z direction, and channels corresponding to the shaft holes in the extending arms in the X direction, the extending arms in the Y direction and the extending arms in the Z direction are formed in the central cube.

Further preferably, the diameter of the enameled wire for winding the detection coil is 0.02mm or less.

Further preferably, the pair of arms in the X-direction, Y-direction and Z-direction are each cylindrical.

Further preferably, terminal blocks connected with the detection coils on the corresponding extending arms are arranged on the end faces of the x-direction extending arm, the y-direction extending arm and the z-direction extending arm.

Further preferably, the central cube, the X-direction expanding arm, the Y-direction expanding arm and the Z-direction expanding arm are integrally formed.

Still more preferably, the central cube, the X-direction expanding arm, the Y-direction expanding arm and the Z-direction expanding arm are all made of nylon.

It is further preferred that the three-dimensional detecting device further comprises a housing, the three-dimensional detecting element being fitted in the housing, the filling material being filled between the housing and the three-dimensional detecting element.

Still more preferably, the housing has a cubic structure, and one of the end faces of the housing has a concave-convex structure.

Compared with the prior art, the beneficial technical effects brought by the utility model are as follows:

1. the three-dimensional detection device for measuring the magnetic field of the motor is provided with the two pairs of expansion arms X, Y, Z in three directions, which are perpendicular to each other, so that an integral three-dimensional detection device is formed, the origins of the detection coils in the three directions of the two pairs X, Y, Z are coincident with the center point of the center cube, a strict two-to-two perpendicular magnetic field is formed, the measurement accuracy of the magnetic field is improved, the error is reduced, the pairs of detection coils on the same axis are connected together, and a certain axial magnetic field detection is carried out together, so that the detection signal is enhanced, the signal interference is avoided, and the detection of a weaker magnetic field is facilitated. Compared with the prior art, the utility model has the advantages that the three expanding arms in the-X direction, the-y direction and the-z direction are added, and the detection coils on the expanding arms in the X direction and the-X direction are connected together, so that on one hand, the winding turns of the coils in the X direction are increased, the detection signal is enhanced, and the detection of a weaker magnetic field is facilitated; on the other hand, the positions (Y and Z are the same) of coils wound in the X direction and the-X direction can be adjusted, so that the fact that the origins of the detection coils in the X direction, the Y direction and the Z direction are coincident with the center point of the cube is ensured, and the measurement error can be effectively reduced. Compared with the prior art, when only the x-direction expanding arm does not have the-x-direction expanding arm, the method is limited by the processing precision and the assembly precision of the expanding arm and the cube, the origin of the detection coil in the x, y and z directions is difficult to coincide with the center point of the cube, and the processing precision of the expanding arm and the cube can be separated by adding the three directions of-x, -y and-z, so that the coil can be directly adjusted, and the origin of the detection coil in the X, Y, Z directions is favorably coincide with one point.

2. The utility model is provided with the through holes on the pair of the extending arms, which is beneficial to detecting the magnetic field of the motor, and is convenient for winding the enameled wire on the extending arms in each direction to manufacture the detecting coil. The coils in the positive direction and the negative direction are a pair, 3 pairs of coils are arranged in total, the coils in the pairs on the same axis are connected together, and magnetic field measurement in a certain axial direction is carried out together, so that the magnetic field passing area is increased, the number of turns is increased, the signal is enhanced, and the intensity of a weaker magnetic field can be detected.

3. The detection coil is the most reliable, convenient and cheap detection element for obtaining alternating magnetic flux, and the working principle of the detection coil can be expressed as follows:wherein e (volts) is the voltage of the active matrix at a turn of N and an average area of A (m ² ) Instantaneous values of the potential induced across the detection coil at magnetic field density B (tesla). The coil constant (AN) determines its sensitivity to a given rate of change of magnetic density. On the premise of a certain average area A, the number of turns of the coil is increased by controlling the diameter of the enameled wire used for winding the coil, and the sensitivity is further improved.

4. And connecting terminals are arranged on the end faces of the x-direction expanding arm, the y-direction expanding arm and the z-direction expanding arm, and concentrated test and measurement line connection are utilized. The center cube, the X-direction stretching arms, the Y-direction stretching arms and the Z-direction stretching arms are all made of nylon, so that the cost is low, and the performance parameters and the stability of the motor are not affected.

5. The utility model is provided with the shell, and the filling material is filled between the shell and the three-dimensional detection element, so that the protection effect on the three-dimensional detection element can be achieved, and the fixing of the detection device is facilitated through the shell. One end face of the shell is a concave-convex structure end face which is a mounting face and is convenient for fixing the detection device.

Drawings

FIG. 1 is a schematic diagram of a three-dimensional probe device according to the present utility model;

FIG. 2 is a schematic cross-sectional view of a three-dimensional probe element of the present utility model;

reference numerals: 1. the three-dimensional detection element comprises a three-dimensional detection element, 2, a central cube, 3, an X-direction spreading arm, 4, a Y-direction spreading arm, 5, a Z-direction spreading arm, 6, an X-direction, 7, -an X-direction, 8, a Y-direction, 9, -a Y-direction, 10, a Z-direction, 11, -a Z-direction, 12, a detection coil, 13, a central point of the central cube, 14, a shaft hole, 15, a channel, 16, a wiring terminal, 17, a shell, 18, a filling material, 19 and an end face of a concave-convex structure.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As a preferred embodiment of the present utility model, this embodiment discloses a three-dimensional detecting device for measuring a magnetic field of a motor, and referring to fig. 2 of the specification, the three-dimensional detecting device includes a three-dimensional detecting element 1, the three-dimensional detecting element 1 includes a central cube 2, an X-direction expanding arm 3, a Y-direction expanding arm 4, and a Z-direction expanding arm 5, and is characterized in that: the X-direction spreading arm 3 takes the center point 13 of the center cube as an origin and comprises a pair of spreading arms in the X direction 6 and the-X direction 7, the Y-direction spreading arm 4 takes the center point 13 of the center cube as the origin and comprises a pair of spreading arms in the Y direction 8 and the-Y direction 9, the Z-direction spreading arm 5 takes the center point 13 of the center cube as the origin and comprises a pair of spreading arms in the Z direction 10 and the-Z direction 11, and the axes of the X-direction spreading arm 3, the Y-direction spreading arm 4 and the Z-direction spreading arm 5 are perpendicular to each other and intersect at the center point 13 of the center cube; enameled wires with the same number of turns are wound on a pair of the X-direction stretching arms 3, the Y-direction stretching arms 4 and the Z-direction stretching arms 5 to serve as detection coils 12, the pair of detection coils 12 on the same axis are connected together, and the origin of the detection coils 12 on the X-direction stretching arms 3, the Y-direction stretching arms 4 and the Z-direction stretching arms 5 coincides with the center point 13 of the center cube.

Compared with the prior art, the utility model adds three stretching arms in the directions of-X, -y and-z, and connects the detection coil 12 on the stretching arm 3 in the X direction 6 and the stretching arm in the-X direction together, on one hand, the winding turns of the coil in the X direction are increased, the detection signal is enhanced, and the detection of weaker magnetic fields is facilitated; on the other hand, the positions (Y and Z are the same) of the coils wound in the X direction 6 and the-X direction 7 can be adjusted, so that the origins of the detection coils 12 in the three directions of the X direction, the Y direction and the Z direction are ensured to be coincident with the center point of the cube, and the measurement error can be effectively reduced. Compared with the prior art that only the X-direction expanding arm 3 does not have the-X-direction expanding arm 3, the method is limited by the processing precision and the assembly precision of the expanding arm and the cube, the origin of the detection coil 12 in the X, y and z directions is difficult to coincide with the center point of the cube, and the processing precision of the expanding arm and the cube can be separated by adding the-X, -y and-z directions, so that the coil can be directly adjusted, and the origin of the detection coil 12 in the X, Y, Z directions is favorably coincide with one point.

In this embodiment, it should be specifically noted that the central cube is not strictly limited to a cube, but is a support for supporting the x-direction, -x-direction, y-direction, -y-direction, z-direction, and-z-direction arm, and the center point of the support is not a center point in a strict sense, but refers to an origin point where the x-direction, -x-direction, y-direction, -y-direction, z-direction, and-z-direction intersect, and is limited to the center point of the central cube for convenience of description.

As an implementation manner of this embodiment, referring to fig. 2 of the specification, coaxial shaft holes 14 are provided on a pair of the extension arms in the X direction, the Y direction and the Z direction, and channels 15 corresponding to the shaft holes 14 on the extension arms 3, 4 and 5 in the X direction are provided in the central cube 2. Through holes are formed in the pair of the extending arms, detection of the magnetic field of the motor is facilitated, and meanwhile winding enameled wires on the extending arms in each direction are facilitated, so that the detection coil 12 is manufactured. The coils in the positive direction and the negative direction are a pair, 3 pairs of coils are arranged in total, the coils in the pairs on the same axis are connected together, and magnetic field measurement in a certain axial direction is carried out together, so that the magnetic field passing area is increased, the number of turns is increased, the signal is enhanced, and the intensity of a weaker magnetic field can be detected.

As still another embodiment of the present embodiment, the diameter of the enamel wire for winding the detection coil 12 is 0.02mm or less. The detection coil 12 is the most reliable, convenient and inexpensive to obtain alternating magnetic fluxThe detection element, its theory of operation can be expressed as:wherein e (volts) is the voltage of the active matrix at a turn of N and an average area of A (m ² ) Instantaneous values of the potential induced across the detection coil 12 at magnetic field density B (tesla). The coil constant (AN) determines its sensitivity to a given rate of change of magnetic density. On the premise of a certain average area A, the number of turns of the coil is increased by controlling the diameter of the enameled wire used for winding the coil, and the sensitivity is further improved.

In this embodiment, it is determined that the number of turns (AN) of the area of these coils is significantly larger than that of the solenoid and coincides with its axis for both the unknown and known single-layer wound coils. A substantially uniform magnetic field is interlinked with the coil. The two coils are connected to a potentiometer and sensitive detector, and power frequency alternating current is input to the solenoid for calibration. The area turn number value of the measured coil can be calculated according to the resistances at the two ends of the potentiometer and the area turn number of the standard coil. This technique leaves the calibration unaffected by the input solenoid current and allows the determination of the unknown polarity (phase) of the coil terminals, and then rotates the device 90 degrees to repeat the above operation, calibrating the Y, Z axes, respectively. The phase determination may cause the coils to be mounted in a prescribed magnetic flux direction. The curve corresponding to the induced potential and the magnetic flux density can be obtained through calibration.

The magnetic flux density in each direction X, Y, Z can be obtained by the detection coil 12 in each direction, respectively, by the following formulaThe space magnetic field density of the measuring point position of the motor can be calculated, wherein GB is the three-dimensional space total magnetic field of the measured position inside the motor, X represents the magnetic flux density in the X direction, Y represents the magnetic flux density in the Y direction, and Z represents the magnetic flux density in the Z direction. The three direction detecting coils 12 can be used independently for measuring a magnetic field in a certain direction or can be used in combination for measuring a magnetic field in space.

As a further preferred implementation of this embodiment, the pair of arms in the X-direction, Y-direction and Z-direction are each cylindrical. Terminal blocks 16 connected with the detection coils 12 on the corresponding extension arms are arranged on the end faces of the X-direction extension arm 3, the Y-direction extension arm 4 and the Z-direction extension arm 5. Centralized testing and wire bonding are utilized.

As an example, the three-dimensional probe element is disposed in the generator end region, air gap, stator core tooth yoke, housing, etc. in areas of interest to the design developer, three pairs of very thin multi-strand polytetrafluoroethylene insulated wires are used to connect the probe coil 12 terminals 16, the wires are twisted pair-pair to avoid hinge flux, and the signal is directed to the test equipment for measurement.

As a further preferred implementation of this embodiment, the central cube 2, the X-direction arm 3, the Y-direction arm 4 and the Z-direction arm 5 are integrally formed. The center cube 2, the X-direction expanding arms 3, the Y-direction expanding arms 4 and the Z-direction expanding arms 5 are all made of nylon materials. The performance parameters and stability of the motor are not affected.

Further preferably, referring to fig. 1 of the specification, the three-dimensional detecting device further includes a housing 17, the three-dimensional detecting element 1 is assembled in the housing 17, and a filling material 18 is filled between the housing 17 and the three-dimensional detecting element 1. Still more preferably, the housing 17 has a cubic structure, and one of the end faces of the housing 17 has a concave-convex end face 19. The present embodiment provides the housing 17, and fills the filling material 18 between the housing 17 and the three-dimensional detecting element 1, and the filling material 18 may be an epoxy material; can play a protective role for the three-dimensional detecting element 1, and the fixing of the detecting device is facilitated by the housing 17. One end face of the housing 17 is a concave-convex end face 19, and the concave-convex end face 19 is a mounting face, so that the detection device is convenient to fix.

Claims (9)

1. The utility model provides a three-dimensional detection device for measuring motor magnetic field, includes three-dimensional detection element (1), three-dimensional detection element (1) include central cube (2), X direction exhibition arm (3), Y direction exhibition arm (4) and Z direction exhibition arm (5), its characterized in that: the X-direction expanding arm (3) takes the center point (13) of the center cube as an origin and comprises a pair of expanding arms in the X direction (6) and the-X direction (7), the Y-direction expanding arm (4) takes the center point (13) of the center cube as the origin and comprises a pair of expanding arms in the Y direction (8) and the-Y direction (9), the Z-direction expanding arm (5) takes the center point (13) of the center cube as the origin and comprises a pair of expanding arms in the Z direction (10) and the-Z direction (11), and the axes of the X-direction expanding arm (3), the Y-direction expanding arm (4) and the Z-direction expanding arm (5) are perpendicular to each other and intersect at the center point (13) of the center cube; enameled wires with the same number of turns are wound on a pair of extending arms of the X-direction extending arm (3), the Y-direction extending arm (4) and the Z-direction extending arm (5) to serve as detection coils (12), the pair of detection coils (12) on the same axis are connected together, and the origin of the detection coils (12) on the X-direction extending arm (3), the Y-direction extending arm (4) and the Z-direction extending arm (5) coincides with a center point (13) of a center cube.

2. A three-dimensional probe device for measuring a magnetic field of a motor as defined in claim 1, wherein: coaxial shaft holes (14) are formed in a pair of extending arms in the X direction (6), the Y direction (8) and the Z direction, and channels (15) corresponding to the shaft holes (14) in the X direction extending arm (3), the Y direction extending arm (4) and the Z direction extending arm (5) are formed in the central cube (2).

3. A three-dimensional probe device for measuring a magnetic field of a motor as defined in claim 1, wherein: the diameter of the enameled wire for winding the detection coil (12) is less than or equal to 0.02mm.

4. A three-dimensional probe device for measuring a magnetic field of a motor according to claim 1 or 2, characterized in that: the pair of spreading arms in the X direction (6), the Y direction (8) and the Z direction are all cylindrical.

5. A three-dimensional probe device for measuring a magnetic field of a motor according to any one of claims 1-3, characterized in that: terminal blocks (16) connected with the detection coils (12) on the corresponding expanding arms are arranged on the end faces of the X-direction expanding arms (3), the Y-direction expanding arms (4) and the Z-direction expanding arms (5).

6. A three-dimensional probe device for measuring a magnetic field of a motor according to any one of claims 1-3, characterized in that: the center cube (2), the X-direction expanding arms (3), the Y-direction expanding arms (4) and the Z-direction expanding arms (5) are of an integrated structure.

7. A three-dimensional probe device for measuring a magnetic field of a motor as defined in claim 6, wherein: the center cube (2), the X-direction expanding arms (3), the Y-direction expanding arms (4) and the Z-direction expanding arms (5) are all made of nylon materials.

8. A three-dimensional probe device for measuring a magnetic field of a motor according to any one of claims 1-3, characterized in that: the three-dimensional detection device further comprises a housing (17), the three-dimensional detection element (1) is assembled in the housing (17), and a filling material (18) is filled between the housing (17) and the three-dimensional detection element (1).

9. A three-dimensional probe device for measuring a magnetic field of a motor as defined in claim 8, wherein: the shell (17) is of a cube structure, and one end face of the shell (17) is of a concave-convex structure end face (19).