CN118112413A - Method, system and storage medium for detecting demagnetization rate of permanent magnet motor - Google Patents

Abstract

The invention discloses a method, a system and a storage medium for detecting demagnetization rate of a permanent magnet motor. Wherein the method comprises the following steps: responding to the disconnection of each parallel branch, and acquiring a first effective value, wherein the first effective value is used for representing a no-load back electromotive force feedback value corresponding to the permanent magnet motor to be tested; determining a second effective value based on target temperature information, wherein the target temperature information is used for representing a temperature value of a current environment, and the second effective value is used for representing a no-load back electromotive force predicted value corresponding to the permanent magnet motor to be detected; and determining the demagnetizing rate of the permanent magnet motor to be tested based on the first effective value and the second effective value. The invention solves the technical problem of low detection accuracy of the demagnetizing rate of the permanent magnet motor in the related technology.

Description

Method, system and storage medium for detecting demagnetization rate of permanent magnet motor

Technical Field

The invention relates to the field of detection of demagnetizing rate of a permanent magnet motor, in particular to a method, a system and a storage medium for detecting the demagnetizing rate of the permanent magnet motor.

Background

At present, the demagnetizing rate of the permanent magnet motor is detected mainly by utilizing the back electromotive force or flux linkage of the permanent magnet motor winding in the whole outward direction. Specifically, fig. 1 is a schematic diagram of a method for detecting a demagnetizing rate of a permanent magnet motor according to an embodiment of the related art, as shown in fig. 1, a connection manner between a permanent magnet motor to be tested and a back electromotive force measuring device is as follows: the three-phase stator windings of the permanent magnet motor to be tested are connected in a star-shaped connection mode, one end where the point A, the point B and the point C are located is the head end of each phase stator winding, namely, one end where the point A, the point B and the point C are located is connected with An oscilloscope or a power analyzer, the tail ends of each phase stator winding are kept connected, at least two parallel branches exist in each phase stator winding, A1-X1, A2-X2 and An-Xn are parallel branches in the A phase stator winding, B1-Y1, B2-Y2 and Bn-Yn are parallel branches in the B phase stator winding, and C1-Z1, C2-Z2 and Cn-Zn are parallel branches in the C phase stator winding. However, for the permanent magnet motor with the number of parallel branches in each phase of stator winding being greater than 1, the detection method adopting the counter electromotive force method is easy to cause the condition that the detection accuracy of the demagnetization rate of the permanent magnet motor is low due to the uneven air gap of the stator of the permanent magnet motor, and the detection method adopting the flux linkage method is easy to cause the condition that the detection accuracy of the demagnetization rate of the permanent magnet motor is low due to the uneven air gap of the stator and the rotor and the circulation existing between each parallel branch.

In view of the above problems, no effective solution has been proposed at present.

Disclosure of Invention

The embodiment of the invention provides a method, a system and a storage medium for detecting the demagnetizing rate of a permanent magnet motor, which at least solve the technical problem of low detection accuracy of the demagnetizing rate of the permanent magnet motor in the related technology.

According to one aspect of the embodiment of the present invention, there is provided a method for detecting a demagnetizing rate of a permanent magnet motor, which is applied to a system for detecting a demagnetizing rate of a permanent magnet motor, the system for detecting a demagnetizing rate of a permanent magnet motor comprising: the permanent magnet motor to be tested, the corresponding three-phase stator windings of the permanent magnet motor to be tested are connected in a star connection mode, and any one phase of stator winding of the three-phase stator windings at least comprises two parallel branches, and the method comprises the following steps: responding to the disconnection of each parallel branch, and acquiring a first effective value, wherein the first effective value is used for representing a no-load back electromotive force feedback value corresponding to the permanent magnet motor to be tested; determining a second effective value based on target temperature information, wherein the target temperature information is used for representing a temperature value of a current environment, and the second effective value is used for representing a no-load back electromotive force predicted value corresponding to the permanent magnet motor to be detected; and determining the demagnetizing rate of the permanent magnet motor to be tested based on the first effective value and the second effective value.

Optionally, in response to each parallel leg opening, obtaining the first effective value includes: one side of each parallel branch is controlled to be disconnected and connected with a back electromotive force measuring device; controlling the permanent magnet motor to be tested and the preset permanent magnet motor to be connected in a preset mode, wherein the preset permanent magnet motor is used for dragging the permanent magnet motor to be tested to rotate; and responding to the preset permanent magnet motor to drag the permanent magnet motor to be tested to perform rotating operation, and acquiring a first effective value based on the rotating period of the permanent magnet motor to be tested.

Optionally, before acquiring the first effective value based on the rotation period of the permanent magnet motor to be measured, the method further includes: acquiring first temperature information, wherein the first temperature information is used for representing the temperature value of an inner cavity of the permanent magnet motor to be tested; acquiring target temperature information; and controlling the preset permanent magnet motor to drag the permanent magnet motor to be tested to rotate based on the first temperature information and the target temperature information.

Optionally, based on the first temperature information and the target temperature information, controlling the preset permanent magnet motor to drag the permanent magnet motor to be tested to rotate includes: and controlling the preset permanent magnet motor to drag the permanent magnet motor to be tested to rotate in response to the first temperature information being consistent with the target temperature information.

Optionally, responding to the preset permanent magnet motor to drag the permanent magnet motor to be tested to perform rotation operation, and obtaining the first effective value based on the rotation period of the permanent magnet motor to be tested includes: responding to a preset permanent magnet motor to drag the permanent magnet motor to be tested to perform rotating operation, and acquiring a third effective value based on the rotating period of the permanent magnet motor to be tested, wherein the third effective value is used for representing an idle back electromotive force feedback value corresponding to each parallel branch, and the idle back electromotive force feedback value corresponding to each parallel branch is acquired based on a back electromotive force measuring device; the first significant value is determined based on the third significant value.

Optionally, determining the first significant value based on the third significant value comprises: and carrying out average processing on the plurality of third effective values to obtain a first effective value.

Optionally, determining the demagnetizing rate of the permanent magnet motor to be measured based on the first effective value and the second effective value includes: the first effective value and the second effective value are compared to obtain a comparison result; and determining the demagnetizing rate of the permanent magnet motor to be tested based on the comparison result.

According to an embodiment of the present invention, there is also provided a permanent magnet motor demagnetizing detection device applied to a permanent magnet motor demagnetizing rate detection system, the permanent magnet motor demagnetizing rate detection system including: the permanent magnet motor to be tested, the corresponding three-phase stator windings of the permanent magnet motor to be tested are connected in a star connection mode, any phase stator winding of the three-phase stator windings at least comprises two parallel branches, and the device comprises: the acquisition module is used for responding to the disconnection of each parallel branch and acquiring a first effective value, wherein the first effective value is used for representing a no-load back electromotive force feedback value corresponding to the permanent magnet motor to be tested; the determining module is used for determining a second effective value based on target temperature information, wherein the target temperature information is used for representing a temperature value of a current environment, and the second effective value is used for representing a no-load back electromotive force predicted value corresponding to the permanent magnet motor to be detected; the determining module is further used for determining the demagnetizing rate of the permanent magnet motor to be tested based on the first effective value and the second effective value.

Optionally, the obtaining module is further configured to: one side of each parallel branch is controlled to be disconnected and connected with a back electromotive force measuring device; controlling the permanent magnet motor to be tested and the preset permanent magnet motor to be connected in a preset mode, wherein the preset permanent magnet motor is used for dragging the permanent magnet motor to be tested to rotate; and responding to the preset permanent magnet motor to drag the permanent magnet motor to be tested to perform rotating operation, and acquiring a first effective value based on the rotating period of the permanent magnet motor to be tested.

Optionally, the obtaining module is further configured to: acquiring first temperature information, wherein the first temperature information is used for representing the temperature value of an inner cavity of the permanent magnet motor to be tested; acquiring target temperature information; and controlling the preset permanent magnet motor to drag the permanent magnet motor to be tested to rotate based on the first temperature information and the target temperature information.

Optionally, the device further comprises a control module, wherein the control module is used for responding to the first temperature information and the target temperature information to be consistent, and controlling the preset permanent magnet motor to drag the permanent magnet motor to be tested to rotate.

Optionally, the determining module is further configured to: responding to a preset permanent magnet motor to drag the permanent magnet motor to be tested to perform rotating operation, and acquiring a third effective value based on the rotating period of the permanent magnet motor to be tested, wherein the third effective value is used for representing an idle back electromotive force feedback value corresponding to each parallel branch, and the idle back electromotive force feedback value corresponding to each parallel branch is acquired based on a back electromotive force measuring device; the first significant value is determined based on the third significant value.

Optionally, the determining module is further configured to: and carrying out average processing on the plurality of third effective values to obtain a first effective value.

Optionally, the determining module is further configured to: the first effective value and the second effective value are compared to obtain a comparison result; and determining the demagnetizing rate of the permanent magnet motor to be tested based on the comparison result.

According to an embodiment of the present invention, there is also provided a nonvolatile storage medium, wherein a computer program is stored in the storage medium, and wherein the computer program is configured to execute the permanent magnet motor demagnetizing rate detection method in any one of the above-described embodiments when executed.

According to one embodiment of the present invention, there is also provided an electronic device including a memory, in which a computer program is stored, and a processor configured to run the computer program to perform the permanent magnet motor demagnetization rate detection method of any of the above.

In the embodiment of the invention, the first effective value is obtained by responding to the disconnection of each parallel branch, the second effective value is determined based on the target temperature information, and the demagnetizing rate of the permanent magnet motor to be detected is determined based on the first effective value and the second effective value, so that the aim of reducing the influence degree of uneven air gap in the three-phase winding and overlarge circulation among the parallel branches on the detection of the demagnetizing rate of the permanent magnet motor to be detected is fulfilled, the technical effect of improving the accuracy of the detection of the demagnetizing rate of the permanent magnet motor is realized, and the technical problem of low detection accuracy of the demagnetizing rate of the permanent magnet motor in the related art is solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:

FIG. 1 is a schematic diagram of a method for detecting demagnetization of a permanent magnet motor according to an embodiment of the related art;

FIG. 2 is a flow chart of a method for detecting demagnetization of a permanent magnet motor according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a method for detecting demagnetization of a permanent magnet motor according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a method for detecting demagnetization of a permanent magnet motor according to another embodiment of the present invention;

FIG. 5 is a flow chart of a method for detecting demagnetization of a permanent magnet motor according to another embodiment of the present invention;

Fig. 6 is a block diagram illustrating a demagnetization rate detection apparatus of a permanent magnet motor according to an embodiment of the present invention.

Detailed Description

In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

According to an embodiment of the present invention, there is provided a method embodiment of a method for detecting a demagnetization rate of a permanent magnet motor, it should be noted that the steps shown in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in an order different from that herein.

Fig. 2 is a flowchart of a method for detecting a demagnetizing rate of a permanent magnet motor according to one embodiment of the present invention, which is applied to a system for detecting a demagnetizing rate of a permanent magnet motor, the system for detecting a demagnetizing rate of a permanent magnet motor comprising: the permanent magnet motor to be tested, the corresponding three-phase stator windings of the permanent magnet motor to be tested are connected in a star connection mode, and any one phase of stator winding of the three-phase stator windings at least comprises two parallel branches, as shown in fig. 2, and the method comprises the following steps:

Step S22, responding to the disconnection of each parallel branch, and acquiring a first effective value, wherein the first effective value is used for representing a no-load back electromotive force feedback value corresponding to the permanent magnet motor to be tested;

In the step S22, the parallel branch refers to the number of parallel coils in the same phase stator winding of the permanent magnet motor to be tested. The first effective value refers to an actual no-load counter electromotive force effective value of the permanent magnet motor to be tested.

Specifically, the three-phase stator windings corresponding to the permanent magnet motor to be tested are connected in a star connection mode, and any one phase of stator winding of the three-phase stator windings at least comprises two parallel branches.

Step S24, determining a second effective value based on target temperature information, wherein the target temperature information is used for representing a temperature value of a current environment, and the second effective value is used for representing a no-load back electromotive force predicted value corresponding to the permanent magnet motor to be detected;

In the step S22, the second effective value refers to an idle-load counter electromotive force effective value when the permanent magnet motor to be measured is not demagnetized at the current ambient temperature.

In particular, the effective value of the no-load back electromotive force of the permanent magnet motor is different under different environmental temperatures. For example, the permanent magnet motor has an effective value of 10V for no-load back emf in case of a high ambient temperature, and 8V for a low ambient temperature.

And S26, determining the demagnetizing rate of the permanent magnet motor to be tested based on the first effective value and the second effective value.

In the step S26, the demagnetizing rate of the permanent magnet motor to be tested refers to the degree of losing the magnetic field of the permanent magnet motor to be tested in a period of time under a specific working condition.

Specifically, the demagnetizing rate of the permanent magnet motor to be measured is calculated according to the actual no-load counter electromotive force effective value of the permanent magnet motor to be measured at the target temperature and the no-load counter electromotive force effective value when the permanent magnet motor is not demagnetized.

Based on the steps S22 to S24, a mode of responding to the disconnection of each parallel branch, obtaining a first effective value and determining a second effective value based on target temperature information is adopted, and the demagnetizing rate of the permanent magnet motor to be detected is determined based on the first effective value and the second effective value, so that the aim of reducing the influence degree of uneven air gap in the three-phase winding and overlarge circulation among the parallel branches on the detection of the demagnetizing rate of the permanent magnet motor to be detected is fulfilled, the technical effect of improving the accuracy of the detection of the demagnetizing rate of the permanent magnet motor is realized, and the technical problem that the detection accuracy of the demagnetizing rate of the permanent magnet motor in the related art is low is solved.

Optionally, in step S22, in response to each parallel branch being opened, obtaining the first effective value includes:

step S221, controlling one disconnected side of each parallel branch to be connected with a back electromotive force measuring device;

in step S221, the back electromotive force measuring device is used for measuring the actual back electromotive force effective value of the permanent magnet motor to be measured. For example, an oscilloscope may display information such as voltage waveforms, current waveforms, frequencies, phases, and amplitudes, and a power analyzer may display information such as power, current, voltage, power factor, and the like.

Specifically, each parallel branch in the three-phase stator winding of the permanent magnet motor to be tested is disconnected, and each disconnected parallel branch is connected with the back electromotive force measuring device. Fig. 3 is a schematic diagram of a method for detecting a demagnetizing rate of a permanent magnet motor according to an embodiment of the present invention, as shown in fig. 3, each parallel branch in each phase of stator winding is disconnected, and each parallel branch is connected to an oscilloscope or a power analyzer, and the tail ends of each phase of stator winding remain connected. That is, parallel branches such as A1-X1, A2-X2, an-Xn, B1-Y1, B2-Y2, bn-Yn, C1-Z1, C2-Z2, cn-Zn and the like are connected with An oscilloscope or a power analyzer, and the tail ends of the stator windings of each phase are kept connected.

Step S222, controlling the permanent magnet motor to be tested and the preset permanent magnet motor to be connected in a preset mode, wherein the preset permanent magnet motor is used for dragging the permanent magnet motor to be tested to rotate;

Specifically, the permanent magnet motor to be detected is controlled to be connected with the preset permanent magnet motor according to a preset mode, and the preset permanent magnet motor is utilized to drag the permanent magnet motor to be detected to rotate.

Specifically, fig. 4 is a schematic diagram of a method for detecting a demagnetizing rate of a permanent magnet motor according to another embodiment of the present invention, as shown in fig. 4, a permanent magnet motor to be measured is controlled to be connected with a preset permanent magnet motor in a centered manner, wherein 1 is the permanent magnet motor to be measured, 2 is a coupling, 3 is a torque rotation speed sensor, 4 is the preset permanent magnet motor, and 5 is an experimental platform for fixing the permanent magnet motor to be measured and the preset permanent magnet motor. Firstly, controlling a coupler of a permanent magnet motor to be tested and a preset permanent magnet motor to be connected with a torque rotation speed sensor, fixing the two permanent magnet motors on an experimental platform, and finally dragging the permanent magnet motor to be tested to rotate through the preset permanent magnet motor.

Step S223, the permanent magnet motor to be tested is dragged to rotate in response to the preset permanent magnet motor, and a first effective value is obtained based on the rotation period of the permanent magnet motor to be tested.

Specifically, when the permanent magnet motor to be tested is dragged by the preset permanent magnet motor to perform rotation operation, the actual no-load counter electromotive force effective value of the permanent magnet motor to be tested is obtained according to the rotation period of the permanent magnet motor to be tested.

Based on the steps S221 to S223, the disconnected side of each parallel branch is controlled to be connected with the counter electromotive force measuring device, the permanent magnet motor to be measured is controlled to be connected with the preset permanent magnet motor in a preset mode, the preset permanent magnet motor is responded to drag the permanent magnet motor to be measured to rotate, a first effective value is obtained based on the rotation period of the permanent magnet motor to be measured, the purpose of reducing the influence degree of uneven air gap in the three-phase winding and overlarge circulation among the parallel branches on the detection of the demagnetizing rate of the permanent magnet motor to be measured is achieved, the no-load counter electromotive force effective value of the permanent magnet motor to be measured can be accurately measured, the technical effect of improving the accuracy of the detection of the demagnetizing rate of the permanent magnet motor is achieved, and the technical problem that the demagnetizing rate of the permanent magnet motor in the related art is low is solved.

Optionally, before step S223, before the first effective value is obtained based on the rotation period of the permanent magnet motor to be measured, the method further includes:

step S2231, obtaining first temperature information, wherein the first temperature information is used for representing a temperature value of an inner cavity of the permanent magnet motor to be tested;

Step S2232, obtaining target temperature information;

step S2233, based on the first temperature information and the target temperature information, controls the preset permanent magnet motor to drag the permanent magnet motor to be tested to rotate.

Specifically, a temperature sensor is used for respectively measuring the inner cavity temperature of the permanent magnet motor to be measured and the current external environment temperature, and recording the inner cavity temperature of the permanent magnet motor to be measured and the current external environment temperature. And controlling the preset permanent magnet motor to drag the permanent magnet motor to be tested to rotate based on the temperature of the inner cavity of the permanent magnet motor to be tested and the current external environment temperature.

Based on the above steps S2231 to S2233, by acquiring the first temperature information, the preset permanent magnet motor is controlled to drag the permanent magnet motor to be tested to perform the rotation operation based on the first temperature information and the target temperature information, so that the accuracy of detecting the demagnetizing rate of the permanent magnet motor is improved.

Optionally, in step S2233, based on the first temperature information and the target temperature information, controlling the preset permanent magnet motor to drag the permanent magnet motor to be tested to perform a rotation operation includes:

and step S22331, controlling the preset permanent magnet motor to drag the permanent magnet motor to be tested to rotate in response to the fact that the first temperature information is consistent with the target temperature information.

Specifically, when the temperature value of the inner cavity of the permanent magnet motor to be tested is consistent with the temperature value of the current external environment, the preset permanent magnet motor is controlled to drag the permanent magnet motor to be tested to rotate.

Based on the step S22331, in response to the first temperature information being consistent with the target temperature information, the preset permanent magnet motor is controlled to drag the permanent magnet motor to be tested to perform rotation operation, so that the accuracy of detecting the demagnetizing rate of the permanent magnet motor is improved.

Optionally, in step S223, responding to the preset permanent magnet motor dragging the permanent magnet motor to be tested to perform a rotation operation, and obtaining the first effective value based on the rotation period of the permanent magnet motor to be tested includes:

Step S2234, in response to the preset permanent magnet motor dragging the permanent magnet motor to be tested to perform rotation operation, obtaining a third effective value based on the rotation period of the permanent magnet motor to be tested, wherein the third effective value is used for representing the no-load back electromotive force feedback value corresponding to each parallel branch, and the no-load back electromotive force feedback value corresponding to each parallel branch is obtained based on the back electromotive force measuring device;

Step S2235, determines the first significant value based on the third significant value.

Specifically, when the permanent magnet motor to be tested is dragged by the preset permanent magnet motor to perform rotation operation, the no-load counter electromotive force effective value corresponding to each parallel branch of the permanent magnet motor to be tested in the mechanical rotation period is recorded through data displayed on the counter electromotive force measuring device. And calculating the actual no-load counter electromotive force effective value of the permanent magnet motor to be tested according to the no-load counter electromotive force effective value corresponding to each parallel branch in the mechanical rotation period of the permanent magnet motor to be tested.

Based on the steps S2234 to S2235, the permanent magnet motor to be tested is dragged to rotate in response to the preset permanent magnet motor, a third effective value is obtained based on the rotation period of the permanent magnet motor to be tested, and the first effective value is determined based on the third effective value, so that the accuracy of detecting the demagnetizing rate of the permanent magnet motor is improved.

Optionally, in step S2235, determining the first significant value based on the third significant value includes:

in step S22351, the average value of the plurality of third effective values is processed to obtain a first effective value.

Specifically, the average value processing is carried out on the corresponding no-load counter electromotive force effective values of each parallel branch in the mechanical rotation period of the permanent magnet motor to be detected, and the actual no-load counter electromotive force effective values of the permanent magnet motor to be detected are obtained.

Based on the above step S22351, the average process is performed on the plurality of third effective values to obtain a first effective value,

Optionally, in step S26, determining the demagnetizing rate of the permanent magnet motor to be measured based on the first effective value and the second effective value includes:

Step S261, comparing the first effective value with the second effective value to obtain a comparison result;

and step S262, determining the demagnetizing rate of the permanent magnet motor to be tested based on the comparison result.

Specifically, the actual no-load counter electromotive force effective value of the permanent magnet motor to be detected is compared with the no-load counter electromotive force effective value of the permanent magnet motor to be detected when the permanent magnet motor to be detected is not demagnetized at the current ambient temperature. And determining the demagnetizing rate of the permanent magnet motor to be tested based on the comparison result. The degree of demagnetizing rate of the permanent magnet motor to be measured directly influences the performance and stability of the permanent magnet motor to be measured.

Further, the demagnetizing rate of the permanent magnet motor to be measured is calculated based on the expression (1). Expression (1) is as follows:

specifically, the smaller the demagnetizing rate of the permanent magnet motor to be measured is, the slower the loss speed of the magnetic field of the permanent magnet motor to be measured is, the higher the stability of the magnetic field is, and the longer the working state can be maintained. And the permanent magnet motor to be tested with small demagnetizing rate can keep a more stable magnetic field in the working process, so that the efficiency and performance of the motor to be tested are improved, and the waste of energy sources is reduced.

Based on the steps S261 to S262, the first effective value and the second effective value are compared to obtain a comparison result, and the demagnetization rate of the permanent magnet motor to be detected is determined based on the comparison result, so that the technical effect of improving the detection accuracy of the demagnetization rate of the permanent magnet motor is achieved, and the technical problem of low detection accuracy of the demagnetization rate of the permanent magnet motor in the related technology is solved.

Fig. 5 is a flowchart of a method for detecting a demagnetizing rate of a permanent magnet motor according to another embodiment of the present invention. As shown in fig. 5, the method mainly comprises the following steps:

step S501, one side of each parallel branch is controlled to be disconnected and connected with a back electromotive force measuring device;

step S502, controlling the permanent magnet motor to be tested and the preset permanent magnet motor to be connected according to a preset mode;

step S503, obtaining first temperature information;

Step S504, obtaining target temperature information;

Step S505, in response to the first temperature information being consistent with the target temperature information, controlling a preset permanent magnet motor to drag the permanent magnet motor to be tested to rotate;

Step S506, a preset permanent magnet motor is responded to drag the permanent magnet motor to be tested to rotate, and a third effective value is obtained based on the rotation period of the permanent magnet motor to be tested;

step S507, carrying out mean value processing on a plurality of third effective values to obtain a first effective value;

step S508, determining a second effective value based on the target temperature information;

step S509, comparing the first effective value with the second effective value to obtain a comparison result;

And step S510, determining the demagnetizing rate of the permanent magnet motor to be tested based on the comparison result.

Based on the steps S501 to S510, the disconnected side of each parallel branch is controlled to be connected with the counter electromotive force measuring device, the permanent magnet motor to be measured is controlled to be connected with the preset permanent magnet motor in a preset mode, the preset permanent magnet motor is responded to drag the permanent magnet motor to be measured to rotate, a first effective value is obtained based on the rotation period of the permanent magnet motor to be measured, the purpose of reducing the influence degree of uneven air gaps in the three-phase windings and overlarge circulation among the parallel branches on the detection of the demagnetizing rate of the permanent magnet motor to be measured is achieved, the no-load counter electromotive force effective value of the permanent magnet motor to be measured can be accurately measured, the technical effect of improving the accuracy of the detection of the demagnetizing rate of the permanent magnet motor is achieved, and the technical problem that the demagnetizing rate of the permanent magnet motor in the related art is low is solved.

From the description of the above embodiments, it will be clear to a person skilled in the art that the method according to the above embodiments may be implemented by means of software plus the necessary general hardware platform, but of course also by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising several instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method of the various embodiments of the present invention.

The embodiment of the invention also provides a device for detecting the demagnetizing rate of the permanent magnet motor, which is used for realizing the embodiment and the preferred embodiment, and is not described again. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

Fig. 6 is a block diagram of a device for detecting a demagnetizing rate of a permanent magnet motor according to one embodiment of the present invention, which is applied to a system for detecting a demagnetizing rate of a permanent magnet motor, the system for detecting a demagnetizing rate of a permanent magnet motor comprising: the permanent magnet motor to be tested, the corresponding three-phase stator winding of the permanent magnet motor to be tested adopts a star connection mode to connect, and any phase stator winding of the three-phase stator winding at least comprises two parallel branches, as shown in the figure, the device comprises:

the obtaining module 601 is configured to obtain a first effective value in response to disconnection of each parallel branch, where the first effective value is used to represent a no-load back electromotive force feedback value corresponding to the permanent magnet motor to be tested;

The determining module 602 is configured to determine a second effective value based on target temperature information, where the target temperature information is used to represent a temperature value of a current environment, and the second effective value is used to represent a predicted value of no-load counter electromotive force corresponding to the permanent magnet motor to be tested;

the determining module 602 is further configured to determine a demagnetizing rate of the permanent magnet motor to be tested based on the first effective value and the second effective value.

Optionally, the obtaining module 601 is further configured to: one side of each parallel branch is controlled to be disconnected and connected with a back electromotive force measuring device; controlling the permanent magnet motor to be tested and the preset permanent magnet motor to be connected in a preset mode, wherein the preset permanent magnet motor is used for dragging the permanent magnet motor to be tested to rotate; and responding to the preset permanent magnet motor to drag the permanent magnet motor to be tested to perform rotating operation, and acquiring a first effective value based on the rotating period of the permanent magnet motor to be tested.

Optionally, the obtaining module 601 is further configured to: acquiring first temperature information, wherein the first temperature information is used for representing the temperature value of an inner cavity of the permanent magnet motor to be tested; acquiring target temperature information; and controlling the preset permanent magnet motor to drag the permanent magnet motor to be tested to rotate based on the first temperature information and the target temperature information.

Optionally, the apparatus further includes a control module 603, configured to control the preset permanent magnet motor to drag the permanent magnet motor to be tested to perform a rotation operation in response to the first temperature information being consistent with the target temperature information.

Optionally, the determining module 602 is further configured to: responding to a preset permanent magnet motor to drag the permanent magnet motor to be tested to perform rotating operation, and acquiring a third effective value based on the rotating period of the permanent magnet motor to be tested, wherein the third effective value is used for representing an idle back electromotive force feedback value corresponding to each parallel branch, and the idle back electromotive force feedback value corresponding to each parallel branch is acquired based on a back electromotive force measuring device; the first significant value is determined based on the third significant value.

Optionally, the determining module 602 is further configured to: and carrying out average processing on the plurality of third effective values to obtain a first effective value.

Optionally, the determining module 602 is further configured to: the first effective value and the second effective value are compared to obtain a comparison result; and determining the demagnetizing rate of the permanent magnet motor to be tested based on the comparison result.

It should be noted that each of the above modules may be implemented by software or hardware, and for the latter, it may be implemented by, but not limited to: the modules are all located in the same processor; or the above modules may be located in different processors in any combination.

According to one embodiment of the present invention, there is also provided a non-volatile storage medium having a computer program stored therein, wherein the computer program is arranged to perform the steps of any of the method embodiments described above when run.

Alternatively, in the present embodiment, the above-described storage medium may be configured to store a computer program for performing the steps of:

S1, responding to disconnection of each parallel branch, and acquiring a first effective value, wherein the first effective value is used for representing a no-load back electromotive force feedback value corresponding to a permanent magnet motor to be tested;

s2, determining a second effective value based on target temperature information, wherein the target temperature information is used for representing a temperature value of a current environment, and the second effective value is used for representing a no-load back electromotive force predicted value corresponding to the permanent magnet motor to be detected;

s3, determining the demagnetizing rate of the permanent magnet motor to be tested based on the first effective value and the second effective value.

Alternatively, in the present embodiment, the storage medium may include, but is not limited to: a usb disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory RAM), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing a computer program.

According to one embodiment of the present invention, there is also provided an electronic device comprising a memory having a computer program stored therein and a processor arranged to run the computer program to perform the steps of any of the method embodiments described above.

Alternatively, in the present embodiment, the above-described processor may be configured to execute the following steps by a computer program:

S1, responding to disconnection of each parallel branch, and acquiring a first effective value, wherein the first effective value is used for representing a no-load back electromotive force feedback value corresponding to a permanent magnet motor to be tested;

s2, determining a second effective value based on target temperature information, wherein the target temperature information is used for representing a temperature value of a current environment, and the second effective value is used for representing a no-load back electromotive force predicted value corresponding to the permanent magnet motor to be detected;

s3, determining the demagnetizing rate of the permanent magnet motor to be tested based on the first effective value and the second effective value.

Alternatively, specific examples in this embodiment may refer to examples described in the foregoing embodiments and optional implementations, and this embodiment is not described herein.

The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.

In the foregoing embodiments of the present invention, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.

In the several embodiments provided in the present application, it should be understood that the disclosed technology may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims (10)

1. The method for detecting the demagnetizing rate of the permanent magnet motor is characterized by being applied to a system for detecting the demagnetizing rate of the permanent magnet motor, and the system for detecting the demagnetizing rate of the permanent magnet motor comprises the following steps: the permanent magnet motor to be tested, the corresponding three-phase stator windings of the permanent magnet motor to be tested are connected in a star connection mode, any one phase stator winding of the three-phase stator windings at least comprises two parallel branches, and the method comprises the following steps:

Responding to the disconnection of each parallel branch, and acquiring a first effective value, wherein the first effective value is used for representing an idle back electromotive force feedback value corresponding to the permanent magnet motor to be tested;

Determining a second effective value based on target temperature information, wherein the target temperature information is used for representing a temperature value of a current environment, and the second effective value is used for representing a no-load back electromotive force predicted value corresponding to the permanent magnet motor to be detected;

And determining the demagnetizing rate of the permanent magnet motor to be tested based on the first effective value and the second effective value.

2. The method of claim 1, wherein obtaining a first effective value in response to each parallel leg opening comprises:

One side of each parallel branch circuit is controlled to be disconnected and connected with a back electromotive force measuring device;

Controlling the permanent magnet motor to be tested and a preset permanent magnet motor to be connected in a preset mode, wherein the preset permanent magnet motor is used for dragging the permanent magnet motor to be tested to rotate;

And responding to the preset permanent magnet motor to drag the permanent magnet motor to be tested to rotate, and acquiring a first effective value based on the rotation period of the permanent magnet motor to be tested.

3. The method of claim 2, further comprising, prior to obtaining the first effective value based on the rotation period of the permanent magnet motor to be measured:

acquiring first temperature information, wherein the first temperature information is used for representing the inner cavity temperature value of the permanent magnet motor to be tested;

Acquiring the target temperature information;

and controlling the preset permanent magnet motor to drag the permanent magnet motor to be tested to rotate based on the first temperature information and the target temperature information.

4. The method of claim 3, wherein controlling the preset permanent magnet motor to drag the permanent magnet motor to be tested to rotate based on the first temperature information and the target temperature information comprises:

and responding to the first temperature information and the target temperature information to be consistent, and controlling the preset permanent magnet motor to drag the permanent magnet motor to be tested to rotate.

5. The method of claim 2, wherein responding to the preset permanent magnet motor dragging the permanent magnet motor to be tested to perform a rotation operation, and obtaining a first effective value based on a rotation period of the permanent magnet motor to be tested comprises:

Responding to the preset permanent magnet motor to drag the permanent magnet motor to be tested to perform rotating operation, and acquiring a third effective value based on the rotating period of the permanent magnet motor to be tested, wherein the third effective value is used for representing the no-load back electromotive force feedback value corresponding to each parallel branch, and the no-load back electromotive force feedback value corresponding to each parallel branch is acquired based on the back electromotive force measuring device;

The first significant value is determined based on the third significant value.

6. The method of claim 5, wherein determining the first effective value based on the third effective value comprises:

And carrying out average value processing on the plurality of third effective values to obtain the first effective values.

7. The method of claim 1, wherein determining the demagnetizing rate of the permanent magnet motor to be measured based on the first effective value and the second effective value comprises:

Comparing the first effective value with the second effective value to obtain a comparison result;

And determining the demagnetizing rate of the permanent magnet motor to be detected based on the comparison result.

8. The utility model provides a permanent magnet motor demagnetizing detection device which characterized in that is applied to permanent magnet motor demagnetizing rate detecting system, permanent magnet motor demagnetizing rate detecting system includes: the permanent magnet motor to be tested, the corresponding three-phase stator winding of the permanent magnet motor to be tested adopts a star connection mode to connect, and any phase stator winding of the three-phase stator winding at least comprises two parallel branches, and the device comprises:

the acquisition module is used for responding to the disconnection of each parallel branch and acquiring a first effective value, wherein the first effective value is used for representing a no-load back electromotive force feedback value corresponding to the permanent magnet motor to be tested;

The determining module is used for determining a second effective value based on target temperature information, wherein the target temperature information is used for representing a temperature value of a current environment, and the second effective value is used for representing an idle counter electromotive force predicted value corresponding to the permanent magnet motor to be detected;

The determining module is further configured to determine a demagnetizing rate of the permanent magnet motor to be tested based on the first effective value and the second effective value.

9. A non-volatile storage medium, wherein a computer program is stored in the storage medium, wherein the computer program is arranged to perform the permanent magnet motor demagnetizing rate detection method according to any one of claims 1 to 7 when run.

10. An electronic device comprising a memory and a processor, characterized in that the memory has stored therein a computer program, the processor being arranged to run the computer program to perform the method of detecting the demagnetization rate of a permanent magnet motor according to any of the claims 1 to 7.