CN112072889A - Permanent magnet linear motor and permanent magnet magnetic performance online detection device and method thereof - Google Patents
Permanent magnet linear motor and permanent magnet magnetic performance online detection device and method thereof Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004804 winding Methods 0.000 claims abstract description 66
- 230000008569 process Effects 0.000 claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 10
- 230000001360 synchronised effect Effects 0.000 claims description 15
- 230000006698 induction Effects 0.000 claims description 12
- 238000009413 insulation Methods 0.000 claims 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims 1
- 230000002159 abnormal effect Effects 0.000 abstract description 12
- 239000000696 magnetic material Substances 0.000 description 8
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- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
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- 239000003513 alkali Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- 230000002427 irreversible effect Effects 0.000 description 1
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- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
- H02K41/03—Synchronous motors; Motors moving step by step; Reluctance motors
- H02K41/031—Synchronous motors; Motors moving step by step; Reluctance motors of the permanent magnet type
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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
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
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- Power Engineering (AREA)
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- General Physics & Mathematics (AREA)
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Abstract
The application relates to the technical field of linear motors, in particular to a permanent magnet linear motor and a device and a method for detecting magnetic property of a permanent magnet of the permanent magnet linear motor on line. The rotor of the permanent magnet linear motor comprises a rotor iron core and a rotor winding, the rotor iron core comprises a rotor yoke and a plurality of rotor teeth arranged on the rotor yoke, the rotor winding is wound on the rotor teeth, the magnetic performance online detection device comprises a self-checking winding and an electromotive force detection device, the self-checking winding and the rotor winding are arranged side by side, and the self-checking winding is arranged at one end of the rotor iron core along the sliding direction of the rotor of the permanent magnet linear motor; the electromotive force detection device is used for detecting the electromotive force generated in the self-checking winding of the permanent magnet linear motor in the constant-speed operation process. The permanent magnet performance in the permanent magnet linear motor stator can be detected at regular time through the permanent magnet magnetic performance online detection device, the abnormal condition in the use process is prevented, if the abnormal condition occurs in the use process, the abnormal condition can be quickly positioned and the abnormal condition can be processed or replaced in time when the abnormal condition occurs in the stator or the rotor.
Description
Technical Field
The application relates to the technical field of linear motors, in particular to a permanent magnet linear motor and a device and a method for detecting magnetic property of a permanent magnet of the permanent magnet linear motor on line.
Background
The linear motor is a motor which directly converts electric energy into linear motion mechanical energy, and can also be regarded as a rotating motor which is obtained by cutting open along the radial direction and unfolding the rotating motor into a straight line, wherein a stator of the rotating motor becomes a rotor of the linear motor, and a rotor of the rotating motor becomes a stator of the linear motor, so that a large number of intermediate transmission mechanisms can be omitted. The stator of the permanent magnet synchronous linear motor is made of permanent magnet materials, and the magnetic performance of the permanent magnet materials is required to be kept stable in order to ensure that the electrical performance of the permanent magnet motor is not changed. The magnetic property of the permanent magnetic material usually changes with the change of environment, temperature and time. When the permanent magnetic material is heated, the magnetic property of the permanent magnetic material is irreversibly lost; the permanent magnetic material can cause irreversible demagnetization under the interference of an external magnetic field; the interior or surface chemical structure of the permanent magnet material is changed under the action of acid, alkali, oxygen, hydrogen and the like, and most of the components in the neodymium iron boron permanent magnet material are iron and neodymium which are easy to oxidize; the magnetic property of the permanent magnetic material can change along with time even if the permanent magnetic material is not influenced by environment and external factors, and the permanent magnetic material has certain natural aging. High temperature or transient overcurrent may degrade magnetic performance during installation and use due to contact with other magnetic materials.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is as follows: how to realize on-line detection after the magnetic property of the permanent magnet linear motor stator changes in the using process. In order to solve the technical problem, the application provides an online detection device for the magnetic performance of a permanent magnet linear motor, so that the magnetic performance of the permanent magnet can be detected online in the operation process of the permanent magnet linear motor, and abnormal occurrence in the use process is prevented.
In order to achieve the above object, according to one aspect of the present technical solution, an embodiment of the present invention provides an online detection apparatus for magnetic performance of a permanent magnet linear motor.
According to the online detection device for the magnetic performance of the permanent magnet in the first aspect of the embodiment of the invention, the rotor of the permanent magnet linear motor comprises a rotor core and a rotor winding, the rotor core comprises a rotor yoke and a plurality of rotor teeth arranged on the rotor yoke, the rotor winding is wound on the rotor teeth, and the online detection device for the magnetic performance of the permanent magnet comprises:
the self-checking winding is arranged in parallel with the rotor winding and is arranged at one end of the rotor iron core along the sliding direction of the permanent magnet linear motor rotor;
and the electromotive force detection device is used for detecting induced electromotive force generated in the self-checking winding in the constant-speed running process of the permanent magnet linear motor.
Further, the permanent magnet magnetic property online detection device further comprises a first insulating framework, and the self-checking winding is wound on the first insulating framework.
Further, the rotor further comprises auxiliary teeth arranged at the end of the rotor core, and the self-checking winding is wound on one of the auxiliary teeth.
Further, in the case where the permanent magnet magnetic property on-line detection device includes a first insulating skeleton, the first insulating skeleton is provided on the auxiliary tooth.
Furthermore, two end wires of the self-checking winding are led out together with a power supply lead of the permanent magnet synchronous motor.
In order to achieve the above object, according to a second aspect of the present disclosure, a permanent magnet linear motor is also provided.
According to the permanent magnet linear motor of the second aspect of the embodiment of the invention, the online detection device for the magnetic property of the permanent magnet is provided.
In order to achieve the above object, according to a third aspect of the present disclosure, the present disclosure further provides an online detection method for magnetic performance of a permanent magnet linear motor.
According to the online detection method for the magnetic property of the permanent magnet in the third aspect of the embodiment of the invention, the online detection device for the magnetic property of the permanent magnet provided in the second aspect of the invention is adopted, and the method comprises the following steps:
the permanent magnet linear motor is enabled to run at a constant speed, then the induced electromotive force generated in the self-checking winding is detected by the electromotive force detection device, the magnetic induction intensity of the current permanent magnet is calculated by the formula (I),
B＝/(NLV) (I)
wherein:
b is the magnetic induction intensity of the current permanent magnet, and the unit is T;
the induced electromotive force generated in the self-checking winding is measured in a unit of V;
l is the linear length of the permanent magnet in the permanent magnet linear motor corresponding to the self-checking winding, and the unit is m;
v is the running speed of the permanent magnet linear motor, and the unit is m/s;
n is the number of turns of the self-checking winding and has no dimensional quantity.
Further, the method for detecting the magnetic property of the permanent magnet on line also comprises the following steps:
comparing the magnetic induction intensity B of the current permanent magnet with the magnetic induction intensity B of the permanent magnet when the permanent magnet linear motor leaves the factory0The size of (d);
if B is less than B0Judging that the magnetic performance of the permanent magnet is changed;
if B is equal to B0And judging that the magnetic property of the permanent magnet is not changed.
Further, the method for detecting the magnetic property of the permanent magnet on line also comprises the following steps:
acquiring the waveform of induced electromotive force generated in the self-checking winding through an electromotive force detection device, and comparing the waveform with the waveform of induced electromotive force generated in the self-checking winding when the permanent magnet linear motor leaves a factory;
and if at least one part of the waveform of the induced electromotive force is distorted, judging that the permanent magnet of the permanent magnet linear motor is loosened.
In the permanent magnet linear motor provided by the technical scheme, the performance of the permanent magnet in the permanent magnet linear motor stator can be detected at regular time through the permanent magnet magnetic performance online detection device and method, so that the abnormal condition is prevented from being generated in the use process, and when the abnormal condition occurs in the use process, the abnormal condition can be quickly positioned and can be timely processed or replaced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:
fig. 1 is a schematic structural diagram of a first mover core according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a first mover according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a second rotor core according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a second mover according to an embodiment of the present invention.
In the figure:
1. a mover core; 101. a mover yoke; 102. the rotor teeth; 2. a rotor winding; 3. self-checking the winding; 4. a first insulating skeleton; 5. auxiliary teeth; 6. and a second insulating skeleton.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is noted that the terms "comprises" and "comprising," and any variations thereof, in the description and claims of this application and the above-described drawings are intended to cover non-exclusive inclusions, such that a system, product or apparatus that comprises a list of elements is not necessarily limited to those elements explicitly listed, but may include other elements not expressly listed or inherent to such product or apparatus.
In this application, the terms "upper", "lower", "inner", "middle", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
As shown in fig. 1 to 4, an embodiment of the present invention provides an online detection apparatus for detecting magnetic properties of a permanent magnet, which is used for detecting whether magnetic properties of the permanent magnet in a permanent magnet linear motor change or not, where the permanent magnet linear motor includes a mover and a stator, the permanent magnet is fixed to the stator, the mover includes a mover core 1 and a mover winding 2, the mover core 1 includes a mover yoke 101 and a plurality of mover teeth 102 disposed on the mover yoke 101, and the mover winding 2 is wound on the mover teeth 102.
As shown in fig. 2 and 4, the permanent magnet magnetic performance online detection device comprises a self-checking winding 3 and an electromotive force detection device, wherein the self-checking winding 3 is arranged side by side with the rotor winding 2, and the self-checking winding 3 is arranged at one end of the rotor core 1 along the sliding direction of the permanent magnet linear motor rotor; and the electromotive force detection device is used for detecting induced electromotive force generated in the self-checking winding 3 in the constant-speed running process of the permanent magnet linear motor.
In the above embodiment, the two wires led out from the self-checking winding 3 are connected with the induced electromotive force detection device, and can be in an open circuit state in the operation process of the motor when not detected. In the three-phase homologous electrifying operation process of the motor, when the permanent magnet synchronous linear motor operates at a constant speed, the back electromotive force of any permanent magnet motor is BLV, B is the magnetic property (magnetic field intensity) of the permanent magnet motor, L is the linear length of the magnetic steel (permanent magnet) corresponding to the self-checking coil, V is the operating speed, the length of L is fixed after the motor scheme is shaped, V is the operating speed at the constant speed during detection, if the magnetic property of the permanent magnet is not changed, the value is unchanged, and if the magnetic property is reduced due to influence, the value is reduced. Therefore, it can be determined that the permanent magnet magnetic property on-line detection method is as follows:
firstly, the permanent magnet linear motor is operated at a constant speed, then the induced electromotive force generated in the self-checking winding 3 is detected by the electromotive force detection device, the magnetic induction intensity of the current permanent magnet is calculated by a formula (I),
B＝/(NLV) (I)
wherein:
b is the magnetic induction intensity of the current permanent magnet, and the unit is T;
the induced electromotive force generated in the self-checking winding is measured in a unit of V;
l is the linear length of the permanent magnet in the permanent magnet linear motor corresponding to the self-checking winding, and the unit is m;
v is the running speed of the permanent magnet linear motor, and the unit is m/s;
n is the number of turns of the self-checking winding and has no dimensional quantity.
Finally, comparing the magnetic induction intensity B of the current permanent magnet calculated by the formula (I) with the magnetic induction intensity B of the permanent magnet when the permanent magnet linear motor leaves the factory0The size of (d);
if B is less than B0Judging that the magnetic performance of the permanent magnet is changed;
if B is equal to B0And judging that the magnetic property of the permanent magnet is not changed.
In the above embodiment, when the permanent magnet synchronous linear motor is operated, the waveform of the back electromotive force generated by the permanent magnet synchronous linear motor is close to a sine wave, and if the permanent magnet moves or the displacement changes, the waveform is distorted, so that another embodiment of the permanent magnet magnetic property online detection method can be determined as follows:
firstly, the permanent magnet linear motor runs at a constant speed, then the waveform of induced electromotive force generated in the self-checking winding 3 is obtained through an electromotive force detection device, then the waveform of the induced electromotive force generated in the self-checking winding 3 when the permanent magnet linear motor leaves a factory is compared with the waveform of the induced electromotive force generated in the self-checking winding 3, and if the waveform of the induced electromotive force is distorted at a certain position, the permanent magnet of the permanent magnet linear motor can be judged to be loosened.
By the device and the method of the embodiment, if the induced electromotive force is reduced or abnormal in waveform, the abnormal condition can be judged to occur in the stator, otherwise, the problem of the stator can be solved, and the stator can be timely treated or replaced.
In the above embodiment, the device and the method for online detecting the magnetic property of the permanent magnet can online detect the property of the permanent magnet in the stator of the permanent magnet linear motor in real time, prevent the occurrence of abnormality in the use process, and can quickly position the abnormal problem occurring in the stator or the rotor when abnormality occurs in use, and can be timely processed or replaced.
In some embodiments, as shown in fig. 1 and 2, the mover further includes auxiliary teeth 5 provided at ends of the mover core 1, and the self-test winding 3 is wound around one of the auxiliary teeth 5. As shown in the figure, the rotor core 1 of the permanent magnet synchronous linear motor is provided, and two auxiliary teeth 5 are designed on two sides of the rotor core 1. The end effect of the permanent magnet synchronous linear motor can cause thrust fluctuation and normal force fluctuation to influence the running precision of the motor, but the auxiliary teeth 5 are added at the end of the motor to inhibit the thrust fluctuation and the normal force fluctuation and improve the running precision. The number of the auxiliary teeth 5 can be 1 or 2, and 2 are optimal for weakening the thrust fluctuation and the normal force fluctuation; the auxiliary teeth 5 can be formed by punching together with the rotor core 1, the width and height of the auxiliary teeth 5 are generally lower than the height and width of the teeth of the rotor core 1, and the size is determined by optimized design, so that the thrust fluctuation and the normal force fluctuation of the linear motor are reduced to the minimum. In the actual production, in order to improve the manufacturability, the stator core and the rotor core can be separated, and the rotor core 1 are combined to form a single auxiliary core. The tooth part of the auxiliary tooth 5 is empty in a common motor without any winding or other accessories, in this case, the self-checking coil can be arranged at any position of the auxiliary tooth 5, so that the self-checking winding 3 can be fixed directly by means of the existing structure of the auxiliary tooth 5.
In some embodiments, as shown in fig. 3 and 4, the end of the mover core 1 does not have the auxiliary teeth 5, the inspection winding may be directly disposed at one end of the mover core 1 without the auxiliary teeth 5, and the self-inspection winding 3 may be fixed by another structure.
In the above embodiment, the self-checking winding 3 is formed by winding an enameled wire with a certain number of turns, the number of turns of the coil affects the magnitude of the induced electromotive force detection value, and the induced electromotive force detection value is in a direct proportional relationship, but has no influence on the detection precision, and the magnitude of the induced electromotive force generated by the self-checking winding 3 is unchanged under the condition that the number of turns of the coil is certain and the magnetic performance of the permanent magnet is unchanged.
As shown in fig. 2 and 4, in some embodiments, the on-line detection device for magnetic property of permanent magnet further includes a first insulating skeleton 4, and the self-checking winding 3 is wound on the first insulating skeleton 4. Under the condition that one end of the rotor iron core 1 is provided with the auxiliary teeth 5, a first insulating framework 4 of the permanent magnet magnetic property online detection device is arranged on the auxiliary teeth 5, and the size of the first insulating framework 4 is matched with that of the auxiliary teeth 5 at the moment.
Similarly, a second insulating framework 6 is further mounted on the rotor core 1 of the permanent magnet linear motor, the rotor winding 2 is wound on the second insulating framework 6, and the second insulating framework 6 is mounted on the rotor teeth 102 of the rotor core 1. The size of the second insulating skeleton 6 matches the size of the mover teeth 102.
In some embodiments, the rotor winding 2 of the permanent magnet synchronous linear motor forms a three-phase winding through wiring to lead out a three-phase power line to be connected with a motor power supply so as to supply power to the motor, and two end lines of the self-checking coil are led out together with a power lead of the permanent magnet synchronous motor, so that the process is convenient.
The permanent magnet magnetic performance on-line detection device according to the above embodiment may further include other necessary components or structures, and the corresponding arrangement positions and connection relationships may refer to related structures in the prior art, and the connection relationships, operation and working principles of the structures that are not described are known to those skilled in the art, and will not be described in detail herein.
The embodiment of the invention also discloses a permanent magnet synchronous linear motor which comprises the permanent magnet magnetic property online detection device in the embodiment of the invention. The online detection device in the permanent magnet synchronous linear motor in the embodiment of the present invention is the specific scheme disclosed in the above embodiment, so that the permanent magnet synchronous linear motor with the online detection device also has all the technical effects of the above embodiment, and details are not repeated here. The permanent magnet synchronous linear motor according to the above embodiment may further include other necessary components or structures, and the corresponding arrangement positions and connection relationships may refer to the permanent magnet synchronous linear motor structure in the prior art, and the connection relationships, operation and working principles of the structures that are not described are known to those skilled in the art and will not be described in detail herein. Some embodiments in this specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The utility model provides a permanent magnet linear electric motor's permanent magnet magnetic property on-line measuring device, permanent magnet linear electric motor's active cell includes active cell iron core (1) and active cell winding (2), active cell iron core (1) includes active cell yoke (101) and sets up a plurality of active cell teeth (102) on active cell yoke (101), active cell winding (2) winding is in on active cell tooth (102), its characterized in that, permanent magnet magnetic property on-line measuring device includes:
the self-checking winding (3) is arranged in parallel with the rotor winding (2), and the self-checking winding (3) is arranged at one end of the rotor iron core (1) along the sliding direction of the permanent magnet linear motor rotor;
and the electromotive force detection device is used for detecting induced electromotive force generated in the self-checking winding (3) in the constant-speed running process of the permanent magnet linear motor.
2. The permanent magnet magnetic property online detection device according to claim 1, further comprising a first insulating skeleton (4), wherein the self-checking winding (3) is wound on the first insulating skeleton (4).
3. The on-line detection device for the magnetic property of the permanent magnet according to claim 1, wherein the rotor further comprises auxiliary teeth (5) arranged at the end of the rotor core (1), and the self-checking winding (3) is wound on one of the auxiliary teeth (5).
4. The on-line permanent magnet magnetic property detection device according to claim 3, wherein in case the on-line permanent magnet magnetic property detection device comprises a first insulation skeleton (4), the first insulation skeleton (4) is arranged on the auxiliary teeth (5).
5. The permanent magnet magnetic property on-line detection device according to claim 1, characterized in that the two end wires of the self-checking winding (3) are led out together with the power supply lead wire of the permanent magnet synchronous motor.
6. A permanent magnet linear motor, characterized in that, comprises the permanent magnet magnetic property on-line detection device of any one of claims 1-5.
7. An on-line detection method for the magnetic property of a permanent magnet linear motor, which is characterized in that the on-line detection device for the magnetic property of the permanent magnet according to any one of claims 1-5 is adopted, and the method comprises the following steps:
the permanent magnet linear motor is enabled to run at a constant speed, then the induced electromotive force generated in the self-checking winding is detected by the electromotive force detection device, the magnetic induction intensity of the current permanent magnet is calculated by the formula (I),
B＝/(NLV) (I)
wherein:
b is the magnetic induction intensity of the current permanent magnet, and the unit is T;
the induced electromotive force generated in the self-checking winding is measured in a unit of V;
l is the linear length of the permanent magnet in the permanent magnet linear motor corresponding to the self-checking winding, and the unit is m;
v is the running speed of the permanent magnet linear motor, and the unit is m/s;
n is the number of turns of the self-checking winding and has no dimensional quantity.
8. The on-line detection method for the magnetic property of the permanent magnet according to claim 7, further comprising:
comparing the magnetic induction intensity B of the current permanent magnet with the magnetic induction intensity B of the permanent magnet when the permanent magnet linear motor leaves the factory0The size of (d);
if B is less than B0Judging that the magnetic performance of the permanent magnet is changed;
if B is equal to B0And judging that the magnetic property of the permanent magnet is not changed.
9. The on-line detection method for the magnetic property of the permanent magnet according to claim 7, further comprising:
acquiring the waveform of induced electromotive force generated in the self-checking winding through an electromotive force detection device, and comparing the waveform with the waveform of induced electromotive force generated in the self-checking winding when the permanent magnet linear motor leaves a factory;
and if at least one part of the waveform of the induced electromotive force is distorted, judging that the permanent magnet of the permanent magnet linear motor is loosened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010921658.1A CN112072889B (en) | 2020-09-04 | 2020-09-04 | Permanent magnet linear motor and permanent magnet magnetic performance online detection device and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010921658.1A CN112072889B (en) | 2020-09-04 | 2020-09-04 | Permanent magnet linear motor and permanent magnet magnetic performance online detection device and method thereof |
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| CN112072889A true CN112072889A (en) | 2020-12-11 |
| CN112072889B CN112072889B (en) | 2022-02-11 |
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