CN106707163B

CN106707163B - Detection system and method for brush motor

Info

Publication number: CN106707163B
Application number: CN201611248983.6A
Authority: CN
Inventors: 邹维克
Original assignee: Shanghai Aobo Intelligent Technology Co ltd
Current assignee: Shanghai Aobo Intelligent Technology Co ltd
Priority date: 2016-12-29
Filing date: 2016-12-29
Publication date: 2023-08-25
Anticipated expiration: 2036-12-29
Also published as: CN106707163A

Abstract

The application provides a detection system and a detection method of a brush motor, wherein a signal induction device is arranged in an effective detection area of an armature magnetic field and a stator magnetic field generated after the brush motor to be detected is electrified, a first induction voltage signal induced by the armature magnetic field and a second induction voltage signal induced by the stator magnetic field at the position are obtained, the current steering and output of the brush motor to be detected are determined according to a pre-stored steering judgment rule of the brush motor to be detected by utilizing the polarity (or phase sequence) relation of the two induction voltage signals, and whether the current steering is correct steering and output is judged by utilizing a pre-stored steering rule of a standard sample brush motor, so that a detector can know whether the current steering of the brush motor to be detected meets the steering requirement of the brush motor to be detected. Therefore, the application can detect the motor steering only by arranging the detection system in the surrounding space of the brush motor, has simple detection process, does not have the problems of mechanical contact and abrasion, and has simple structure and easy realization.

Description

Detection system and method for brush motor

Technical Field

The application relates to the technical field of motor detection, in particular to a detection system and method for a brush motor.

Background

In daily life of people and various industrial controls, an electric motor plays an irreplaceable role as a power device, and since a steering error of the electric motor causes driving abnormality, it is necessary to detect the steering of the electric motor.

In the prior art, for detecting a direct-current permanent magnet brush motor or an excited brush motor which is commonly used at present, a grating encoder is connected with a motor shaft, or a leaning wheel provided with the grating encoder is contacted with the motor shaft and rotates along with the motor shaft, and then the detected steering direction of the brush motor is determined by analyzing the output waveform of the grating encoder.

However, the existing detection system is complex in structure, complex in operation and mechanically worn in the detection process.

Disclosure of Invention

In view of the above, the application provides a detection system and a detection method for a brush motor, which solve the technical problems of complex structure, complex operation and mechanical abrasion of the existing detection system for the brush motor.

In order to solve the technical problems, the technical scheme provided by the application is as follows:

a system for detecting a brushed motor, the system comprising: signal induction device, control circuit and power supply unit, wherein:

The signal induction device is arranged in an effective detection area of the brush motor to be detected, and is used for acquiring a first induced voltage signal caused by an armature magnetic field at the position and a second induced voltage signal caused by a stator magnetic field, and determining the armature magnetic field and the stator magnetic field generated in a surrounding space after the power is on;

the control circuit is respectively connected with the signal sensing device and the signal output circuit, and is used for determining the current steering of the brush motor to be tested according to a pre-stored steering judgment rule of the direct current permanent magnet brush motor to be tested by utilizing the characteristic relation of the first sensing voltage signal and the second sensing voltage signal, judging whether the current steering of the brush motor to be tested is correct or not by utilizing the pre-stored steering rule of the standard brush motor to be tested, and obtaining a judgment result and the current steering of the brush motor to be tested;

the power supply device is connected with the brush motor to be tested.

Preferably, the method comprises the steps of,

when the brush motor to be tested is a direct-current permanent magnet brush motor, the stator magnetic field is specifically a stator permanent magnet magnetic field, and the characteristic relationship between the first induced voltage signal and the second induced voltage signal obtained by the control circuit is specifically a polarity relationship between the first induced voltage signal and the second induced voltage signal;

When the brush motor to be tested is an excitation brush motor, the stator magnetic field is specifically a stator excitation magnetic field, and the characteristic relationship between the first induced voltage signal and the second induced voltage signal obtained by the control circuit is specifically a polarity or phase sequence relationship between the first induced voltage signal and the second induced voltage signal.

Preferably, the signal sensing device includes: a first magnetic sensor and a second magnetic sensor arranged at a first angle to the magnetic induction direction, wherein:

the magnetic induction direction of the first magnetic sensor points to the central shaft of the brush motor to be detected, and a first induced voltage signal caused by an armature magnetic field at the position is obtained;

and the second magnetic sensor acquires a second induced voltage signal caused by the stator magnetic field at the position. Preferably, the signal sensing device includes: a third magneto-sensitive element;

the magnetic induction direction of the third magnetic sensor forms a second angle with the central axis of the brush motor to be detected, and the second angle is not equal to 0 degree, 90 degrees, 180 degrees and 270 degrees

Preferably, the control circuit includes: the device comprises a first signal processing circuit, a second signal processing circuit, a judging circuit, a memory and a controller, wherein:

The first signal processing circuit is connected with the first magneto-sensitive element, and the second signal processing circuit is connected with the second magneto-sensitive element;

the judging circuit is respectively connected with the first processing circuit and the second processing circuit and is used for identifying the polarities or the phase sequences of the processed first induced voltage signal and the processed second induced voltage signal;

the controller is respectively connected with the memory and the judging circuit, determines the current steering of the brush motor to be tested according to the steering judging rule of the brush motor to be tested obtained from the memory by utilizing the polarity or phase sequence relation between the obtained first induced voltage signal and the obtained second induced voltage signal, and judges whether the current steering of the brush motor to be tested is correct or not by utilizing the steering rule of the standard brush motor obtained from the memory.

Preferably, the signal sensing device and the control circuit are disposed in the same housing, and the system further comprises:

the communication circuit is arranged in the shell and connected with the control circuit, and the communication circuit transmits a trigger instruction sent by external equipment to the control circuit so that the control circuit triggers the signal sensing device to enter a working state; and the judgment result obtained by the control is sent to the external equipment by the current steering of the brush motor to be tested;

Or the signal output circuit is arranged in the shell, and obtains and outputs the judgment result obtained by the control circuit and the current steering direction of the brush motor to be tested.

Signal induction device

Preferably, the signal sensing device and the control circuit are arranged in two mutually independent first shells; or the first magnetic sensor, the second magnetic sensor and the control circuit are respectively arranged in three independent second shells; the system further comprises a signal output circuit, wherein:

the signal output circuit is arranged in a shell where the control circuit is located or in a third shell which is different from the first shell and the second shell, and outputs a judgment result obtained by the control circuit and the current steering direction of the brush motor to be tested.

Preferably, the system further comprises:

and the switching circuit is used for enabling the power supply device to be connected with the brush motor to be tested through the switching circuit and controlling the on-off between the power supply device and the brush motor to be tested.

Preferably, the system further comprises: a hint circuit, wherein:

the prompting circuit outputs corresponding prompting information according to different steering of the brush motor to be detected and different judging results of judging whether the current steering of the brush motor to be detected is correct or not.

A method of detecting a brushed motor, for use in a brushed motor detection system as described above, the method comprising:

when the brush motor to be tested is electrified, a first induced voltage signal caused by an armature magnetic field at the position of the signal induction device and a second induced voltage signal caused by a stator magnetic field are obtained;

determining the current steering of the brush motor to be tested according to a prestored steering judgment rule of the brush motor to be tested by utilizing the characteristic relation between the first induced voltage signal and the second induced voltage signal;

judging whether the current steering of the brush motor to be tested is correct steering or not by utilizing a steering rule of a pre-stored standard sample brush motor;

and outputting the current steering and judging result of whether the brush motor to be tested is correctly steered or not.

Therefore, the application provides a detection system and a detection method of the brush motor, and the application obtains a first induced voltage signal caused by an armature magnetic field and a second induced voltage signal caused by a stator magnetic field (namely a stator permanent magnet magnetic field or a stator exciting magnetic field) at the position of the first induced voltage signal and the second induced voltage signal caused by the armature magnetic field and the stator magnetic field through arranging a signal induction device in an effective detection area of the armature magnetic field and the stator magnetic field generated after the brush motor to be detected (such as a direct-current permanent magnet brush motor or an exciting motor) is electrified, so that a control circuit obtains the current steering of the brush motor to be detected according to a pre-stored steering judgment rule of the brush motor to be detected, and meanwhile, can also obtain whether the current steering of the brush motor to be detected is correct steering by utilizing a pre-stored standard sample so as to enable a detector to know whether the current steering of the brush motor to be detected meets the steering requirement. Therefore, the application can detect the steering of the motor only by arranging the detection system in the surrounding space of the brush motor, has simple detection process, does not have the problems of mechanical contact and abrasion, and has simple structure and easy realization.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a detection system for a brush-direct motor according to the present application;

FIG. 2 is a schematic diagram of another brush motor detection system according to the present application;

FIG. 3 is a schematic diagram of another embodiment of a detection system for a brushed motor according to the present application;

FIG. 4 (a) shows a permanent magnet polarity arrangement and armature energized polarity state of a DC permanent magnet brushed motor of the present application;

FIG. 4 (b) is a magnetic field profile corresponding to FIG. 4 (a);

FIGS. 4 (c) and 4 (d) are waveforms of induced voltage signals corresponding to the two magnetic fields of FIG. 4 (b);

FIG. 5 (a) is a schematic diagram of another permanent magnet polarity arrangement and armature energized polarity condition of a DC permanent magnet brushed motor of the present application;

FIG. 5 (b) is a magnetic field profile corresponding to FIG. 5 (a);

FIGS. 5 (c) and 5 (d) are waveforms of induced voltage signals corresponding to the two magnetic fields of FIG. 5 (b);

FIG. 6 (a) is a schematic diagram of a permanent magnet polarity arrangement and armature energized polarity condition of a DC permanent magnet brushed motor of the present application;

FIG. 6 (b) is a magnetic field profile corresponding to FIG. 6 (a);

FIGS. 6 (c) and 6 (d) are waveforms of induced voltage signals corresponding to the two magnetic fields of FIG. 6 (b);

FIG. 7 (a) illustrates a stator field pole arrangement and armature energized polarity condition of a field brushed motor of the present application;

FIG. 7 (b) is a magnetic field profile corresponding to FIG. 7 (a);

FIGS. 7 (c) and 7 (d) are waveforms of induced voltage signals corresponding to the two magnetic fields of FIG. 7 (b);

FIG. 8 (a) is a stator field pole arrangement and armature energized polarity state of another field brushed motor of the present application;

FIG. 8 (b) is a magnetic field profile corresponding to FIG. 8 (a);

FIGS. 8 (c) and 8 (d) are waveforms of induced voltage signals corresponding to the two magnetic fields of FIG. 8 (b);

FIG. 9 (a) is a stator field pole arrangement and armature energized polarity state of yet another field brushed motor of the present application;

FIG. 9 (b) is a magnetic field profile corresponding to FIG. 9 (a);

FIGS. 9 (c) and 9 (d) are waveforms of induced voltage signals corresponding to the two magnetic fields of FIG. 9 (b);

FIG. 10 (a) is a stator field pole arrangement and armature energized polarity state of yet another field brushed motor of the present application;

FIG. 10 (b) is a magnetic field profile corresponding to FIG. 10 (a);

FIGS. 10 (c) and 10 (d) are waveforms of induced voltage signals corresponding to the two magnetic fields of FIG. 10 (b);

FIGS. 11 (a) and 11 (b) are schematic diagrams of the phase relationship of the induced voltage signals at different magnetic field polarities of an AC powered brush motor, respectively;

FIG. 12 is a schematic view of a portion of another embodiment of a brush motor detection system according to the present application;

FIG. 13 is a schematic diagram of another embodiment of a detection system for a brushed motor according to the present application;

FIG. 14 is a schematic diagram of another embodiment of a brush motor detection system according to the present application;

fig. 15 is a flowchart of an embodiment of a method for detecting a brushed motor according to the present application.

Detailed Description

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

In order that the above-recited objects, features and advantages of the present application will become more readily apparent, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description.

As shown in fig. 1, a schematic structural diagram of an embodiment of a detecting system for a brush motor according to the present application is suitable for detecting a dc permanent magnet brush motor and an exciting brush motor, and fig. 1 only illustrates a dc permanent magnet brush motor as an example. In practical application, the detection system provided in this embodiment may include: signal sensing device 100, control circuit 200, and power supply device 300, wherein:

the power supply device 300 can be connected with the brush motor 400 to be tested, and can supply power to the brush motor 400 to be tested to operate according to actual detection requirements.

In this embodiment, when the brush motor 400 to be tested is specifically a dc permanent magnet brush motor, the power supply device 300 may be specifically a mains supply rectifying power source or a dc programmable power source, and when the brush motor 400 to be tested is specifically an exciting brush motor, the power supply device 300 may be specifically a mains supply ac power source, a rectifying power source, an ac programmable power source, or a dc programmable power source, etc., and the specific circuit structure of the power supply device 300 is not limited in the present application, and may be determined according to the structure of the brush motor to be tested, however, it should be noted that, in practical application, when the circuit structure of the selected power supply device 300 is different, specific control processes may be different in order to realize power supply to the brush motor 400 to be tested.

Alternatively, when the power supply device 300 is a programmable power supply, the power supply device 300 may be connected to the control circuit 200 (the connection relationship is not shown in the figure), so that the control circuit 200 directly controls the power supply device 300 to supply power to the brush motor 400 to be tested.

Wherein, the power supply device 300 and the control circuit 200 can be arranged in a shell, and a user can trigger the control circuit 200 to control the power supply device 200 to work through a control button exposed outside the shell; alternatively, the power supply device 300 is used as an independent device, and the user directly triggers the power supply device 300 to work by controlling a button on the user; or, a triggering instruction can be sent to the power supply device through external equipment (such as computer equipment and the like) to control the power supply device to supply power to the brush motor to be tested.

Of course, the application can also control the working condition of the programmable power supply by other controllers, and the control mode of the programmable power supply is not particularly limited.

It should be noted that, when the power supply device 300 is a programmable power supply, the brush motor 400 to be tested may be a dc permanent magnet brush motor or an exciting brush motor, and for different types of brush motors, a corresponding type of programmable power supply needs to be selected for power supply.

Optionally, if the power supply device 300 is a mains supply, as shown in fig. 2, which is still illustrated by taking a dc permanent magnet brush motor as an example, the detection system provided by the present application may further include a switch circuit 500, so that the power supply device 300 is connected with the brush motor 400 to be tested through the switch circuit 500, and the on-off of the power supply device 300 and the brush motor 400 to be tested is controlled, so as to realize the power supply control of the brush motor 400 to be tested. Similarly, in practical application of this alternative embodiment, for different types of brush motors, a corresponding type of mains supply (ac mains supply or rectified mains supply) needs to be selected for power supply.

Alternatively, as shown in fig. 3, which illustrates a brush motor as an example, similar to the detection method of a dc permanent magnet brush motor, the present application does not provide a corresponding drawing, and in practical application of the present application, the switch circuit 500 may include a relay, and the control circuit 200 may control the relay to draw in, so that the power supply device 300 supplies power to the brush motor 400 to be tested, at this time, as shown in fig. 3, the control end of the relay may be connected to the control circuit 200, and the other two ends are respectively connected to the brush motor 400 to be tested and the power supply device 300. Of course, other controllers may be used to control the on/off of the relay according to the present application, and the present application is not limited to the connection structure shown in fig. 3.

The switching circuit 500 of the present application is not limited to the relay, but may be an electronic switch, etc., and the specific configuration of the present application is not limited thereto, and the present application will be described only by taking the relay as an example.

The signal sensing device 100 may be disposed in an effective detection area of the brush motor 400 to be tested, and acquire a first induced voltage signal induced by an armature magnetic field and a second induced voltage signal induced by a stator magnetic field at a location.

The effective detection area of the brush motor 400 to be tested may be determined by an armature magnetic field and a stator magnetic field generated in a surrounding space after the brush motor to be tested is powered on, which is described in detail below.

In practical applications, after the power supply device 300 supplies power to the brush motor 400 to be tested, the armature of the brush motor 400 to be tested will induce a dynamic magnetic field, namely an armature magnetic field, due to the change of the working current, the armature magnetic field may include an abrupt magnetic field induced by the brush motor 400 to be tested at the moment of starting and an alternating pulsating magnetic field in a stable operation stage, and the armature magnetic field will diffuse to the housing of the brush motor 400 to be tested and its surroundings; similarly, the magnetic field generated by the stator of the brush motor 400 to be tested also diffuses toward the housing of the brush motor 400 to be tested and its surroundings. It can be seen that, in the actual detection process, the signal induction device 100 in the detection system may be located in the armature magnetic field and the stator magnetic field, and specifically located in the effective detection areas of the armature magnetic field and the stator magnetic field, so as to ensure that the signal induction device 100 can detect the corresponding induced voltage signals after working.

In the present application, when the brush motor 400 to be tested is specifically a dc permanent magnet brush motor, the stator magnetic field is specifically a stator permanent magnet magnetic field, and at this time, the effective detection area set by the signal sensing device 100 for detecting the brush motor may be specifically an effective detection area of an armature magnetic field and a stator permanent magnet magnetic field generated after the dc permanent magnet brush motor 400 is powered on, and the second induced voltage signal is an induced voltage signal induced by the stator permanent magnet magnetic field.

When the brush motor 400 to be tested is specifically an excited brush motor, the stator magnetic field is specifically a stator exciting magnetic field, at this time, the effective detection area where the signal induction device 100 is located may specifically be an effective detection area of an armature magnetic field and a stator exciting magnetic field generated after the brush motor 400 to be tested is energized, and the second induced voltage signal is an induced voltage signal induced by the stator exciting magnetic field.

In the present application, a specific detection process of the dc permanent magnet brush motor to be detected will be described only by taking the example that the dc permanent magnet brush motor 400 to be detected has a pair of permanent magnets, i.e., an S pole and an N pole.

Assuming that the S-pole and N-pole of the permanent magnet are arranged in the dc permanent magnet brushed motor 400 to be tested in the manner shown in fig. 4 (a), and the polarity of the armature of the dc permanent magnet brushed motor 400 to be tested after being energized is shown in fig. 4 (a), that is, the armature operating current on the N-pole side of the permanent magnet is outward, indicated by "·", and the armature operating current on the S-pole side of the permanent magnet is inward, indicated by "+", it is determined that the armature of the dc permanent magnet brushed motor 400 to be tested will rotate clockwise according to the law of left hand in electromagnetics, that is, assuming that the arrangement of the polarities of the permanent magnets of the dc permanent magnet brushed motor 400 to be tested and the polarity of the armature energized are shown in fig. 4 (a), the correct rotation of the dc permanent magnet brushed motor 400 to be tested should be clockwise.

According to the above analysis method, if the armature current polarity of the dc permanent magnet brush motor 400 to be tested in fig. 4 (a) is changed, as shown in fig. 5 (a); or the polarity arrangement of the permanent magnets is changed, as shown in fig. 6 (a), both of these changes will cause the dc permanent magnet brush motor 400 to be tested to turn counterclockwise, i.e. not correctly, i.e. in this embodiment, the dc permanent magnet brush motor to be tested turns clockwise.

For convenience of description, the steering detection process of the to-be-detected excited brush motor will be described with reference to the case where the to-be-detected excited brush motor 400 has a pair of excitation poles.

Assuming that the current flow generated by the armature and stator exciting coil of the brush motor 400 to be excited being connected to the forward direct current is as shown in fig. 7 (a), the stator exciting polarity of the brush motor 400 to be excited is left S and right N according to the right hand law in the electromagnetics, and it is determined that the armature of the brush motor 400 to be excited will rotate clockwise according to the left hand law in the electromagnetics, that is, assuming that the stator exciting coil of the brush motor 400 to be excited corresponds to the armature coil being connected to the forward direct current, the generated magnetic pole polarity is as shown in fig. 7 (a), the correct steering of the brush motor 400 to be excited should be clockwise.

According to the above analysis method, if the winding direction of the stator exciting coil of the brush motor 400 to be excited in fig. 7 (a) is changed, or the energization polarity is changed, as shown in fig. 8 (a), the stator exciting polarity is changed; alternatively, the armature coil winding direction or the energization polarity is changed, which causes the armature field polarity to be changed as shown in fig. 9 (a). Both of these changes will result in the field brushed motor 400 to be tested being turned counter-clockwise, i.e., not correctly, i.e., in this embodiment, the field brushed motor to be tested is turned clockwise only correctly.

It can be seen that the direction of the dc permanent magnet brush motor is related to the arrangement of the stator permanent magnet polarity and the armature energization polarity, and the direction of the exciting brush motor is related to the arrangement of the stator exciting polarity and the armature energization polarity, and in practical application, when the arrangement of the stator permanent magnet polarity of the dc permanent magnet brush motor (or the arrangement of the stator exciting polarity of the exciting brush motor) is different, the magnetic field (or the magnetic field) of the stator permanent magnet formed by the permanent magnet (or the exciting coil) will also be different, and similarly, when the armature energization polarity of the brush motor to be tested is different, the armature magnetic field caused by the change of the direction of the working current of the armature will also be different.

In the actual detection process, the application can determine the maximum space range in which the device can detect the magnetic field signals generated by the brush motor to be detected according to the detection performance and other factors of the device used by the signal induction device 100, and then the signal induction device 100 is set in the maximum space range to finish the detection of the brush motor to be detected.

Specifically, after the armature of the brush motor 400 to be tested is energized to generate an armature magnetic field and the magnetic leakage field generated by the stator (i.e., the stator permanent magnet or the stator exciting coil), the present application can use the maximum spatial range of the armature magnetic field and the magnetic leakage field detected by the signal sensing device 100 as an effective detection area, and the signal sensing device 100 can be disposed in the effective detection area during actual detection.

In this embodiment, the maximum spatial range that the armature of the brush motor 400 to be tested generates by energizing the armature and the magnetic field generated by the stator can be covered together may be set as the first preset range, and the signal sensing device 100 is set within the first preset range, and the maximum area of the effective signal generated by the magnetic field, that is, the maximum angle formed by taking the central radial lines of the two permanent magnets of the dc permanent magnet brush motor 400 to be tested as the symmetry axis, may be set as the effective angle β, as shown in fig. 4 (b), or the maximum angle formed by taking the central radial lines of the pair of exciting poles of the exciting brush motor 400 to be tested as the symmetry axis, as shown in fig. 7 (b), and when the signal sensing device 100 is located at different positions, the direction of the effective angle β may be changed accordingly.

It should be noted that, in fig. 1 to 3, the effective angle is only described by taking the position of the signal sensing device 100 in the second quadrant as an example, when the signal sensing device 100 is in the third quadrant, as shown in fig. 4 (b) or fig. 7 (b), the effective detection area of the corresponding magnetic field will also change accordingly, that is, the symmetrical area below the effective angle β currently marked in fig. 1 to 3 is changed, and since the detection methods in both cases are similar, the present application will not be described in detail here.

Based on similar analysis, the signal characteristics sensed by the signal sensing device 100 in the first quadrant are the same as those sensed by the second quadrant, and the signal characteristics sensed by the signal sensing device 100 in the fourth quadrant are the same as those sensed by the third quadrant, which are not described in detail herein.

In summary, the common area of the first preset range and the effective angle β is the effective detection area of the present application, and the specific position of the effective detection area is related to the specific position of the signal sensing device 100. The specific numerical value of the angle β is not limited in the present application, and may be set by means of experiments, experience, or the like.

In the actual detection, the signal sensing device 100 may be disposed in the effective detection area as shown in fig. 4 (b) or fig. 7 (b). That is, the signal sensing device 100 is set in the first preset range, for the detection of the direct current permanent magnet brush motor to be detected, the signal sensing device can also form a preset angle alpha with the radial line of the center between the permanent magnet S and the permanent magnet N, for the detection of the excited brush motor to be detected, the signal sensing device can form a preset angle alpha with the radial line of the center between the two stator poles, wherein alpha < beta/2, the angle alpha can be as small as possible under the condition of permission, but the application is not limited to specific numerical values; the specific distance values of the signal induction device 100 from the surfaces of the direct-current permanent magnet brush motor to be measured and the exciting brush motor to be measured are not limited, and the signal induction device mainly uses signals capable of accurately identifying the armature magnetic field and the stator magnetic field as setting principles.

It should be noted that, in the process of detecting the brush motor 400 to be detected according to the present application, once the position of the signal sensing device 100 is set, the detecting process is not changed.

Based on the above analysis, the present application can analyze the armature magnetic field and the stator magnetic field generated after the brush motor 400 to be tested is energized by analyzing the induced voltage signal induced by the magnetic field so as to determine the current steering of the brush motor 400 to be tested, so that after the signal induction device 100 is set in the above manner, the present application can acquire the first induced voltage signal induced by the armature magnetic field and the second induced voltage signal induced by the stator magnetic field by the signal induction device 100 and send the first induced voltage signal and the second induced voltage signal to the control circuit 200.

Alternatively, in practical applications, as shown in fig. 3, the signal sensing device 100 may include a first magnetic sensor 110 and a second magnetic sensor 120, but is not limited thereto, wherein:

when the first magnetic sensor 110 and the second magnetic sensor 120 are arranged, the magnetic induction directions of the first magnetic sensor 110 and the second magnetic sensor 120 can be arranged at a first angle, and the magnetic induction direction of the first magnetic sensor 110 is directed to the central axis of the brush motor to be tested.

In this embodiment, the first induced voltage signal induced by the armature magnetic field at the location is obtained through the first magneto-sensitive element 110, and the second induced voltage signal induced by the stator magnetic field at the location is obtained through the second magneto-sensitive element 120, wherein the present application is not limited to a specific location with respect to the effective detection areas of the armature magnetic field and the stator magnetic field of the first magneto-sensitive element 110 and the second magneto-sensitive element 120.

Preferably, the first angle between the magnetic induction directions of the first magnetic sensor 110 and the second magnetic sensor 120 may be 90 degrees, that is, the first magnetic sensor 110 and the second magnetic sensor 120 may be disposed in a relative quadrature, as shown in fig. 3, but not limited thereto, and the two magnetic sensors can correctly identify the signal as a suitable angle, and the present application is illustrated only by taking 90 degrees as an example, and the detection process under other suitable angles is similar, and the present application will not be described in detail.

It should be noted that, in the present application, once the magnetic induction directions and positions of the first magnetic sensor 110 and the second magnetic sensor 120 are set, the detection of the type of the brush motor 400 to be detected cannot be changed any more during the detection process, and the detection of the type of the motor is completed according to the standard. Wherein, the direction of the corresponding magnetic field detected by the first magnetic sensor 110 or the second magnetic sensor 120 is the same as the magnetic induction direction, and the induced voltage signal induced by the magnetic field is a positive voltage signal; conversely, if the detected direction of the corresponding magnetic field is opposite to the magnetic induction direction, the induced voltage signal induced by the magnetic field is a negative voltage signal, as shown in fig. 4 (c), 4 (d), 5 (c), 5 (d), 6 (c), 6 (d), or as shown in fig. 7 (c), 7 (d), 8 (c), 8 (d), 9 (c), 9 (d).

Alternatively, the first magnetic sensor 110 and the second magnetic sensor 120 in this embodiment may be hall elements, which are not particularly limited in the present application.

Alternatively, the signal sensing device 100 may include only one magnetic sensing element, i.e., a third magnetic sensing element, where the magnetic induction direction of the third magnetic sensing element may be set at a second angle with respect to the central axis of the brushed motor to be tested, where the second angle is not equal to 0 degrees, 90 degrees, 180 degrees, and 270 degrees, that is, when the third magnetic sensing element is set, the magnetic induction direction of the third magnetic sensing element needs to be non-parallel to and non-perpendicular to the central axis of the brushed motor, so that the magnetic induction direction of the third magnetic sensing element has a first component pointing to the central axis of the brushed motor to be tested and a second component perpendicular to the first component, which is used to obtain a first induced voltage signal induced by the armature magnetic field and a second induced voltage signal induced by the stator magnetic field, respectively, and the application principle of the second magnetic sensing device in the detection system of the present application is similar to that described in the alternative embodiment in which the signal sensing device includes two magnetic sensing elements, which is not described herein.

The control circuit 200 may be connected to the signal sensing device 100, and determine, according to a pre-stored steering determination rule of the brush motor to be tested, a current steering of the brush motor to be tested, and determine, according to a pre-stored steering rule of the standard brush motor to be tested, whether the current steering of the brush motor to be tested is correct, by using a polarity or phase relation (specifically, may be determined according to a power characteristic of the brush motor to be tested) of the obtained first induced voltage signal and the second induced voltage signal, so as to obtain a determination result and the current steering of the brush motor to be tested.

In practical application of the embodiment, when the induced voltage signal is a positive voltage signal, the polarity of the induced voltage signal may be considered as positive; on the contrary, the polarity of the induced voltage signals can be considered as negative, and the steering judgment rule of the brush motor to be tested, namely the corresponding relationship between the polarity relationship of the two obtained induced voltage signals and the steering of the brush motor to be tested, can be analyzed and determined according to the following mode.

It should be noted that, the analysis of the following embodiments of the present application may be described by taking the signal sensing device 100 including the first sensing element 110 and the second sensing element 120 as an example, where the arrangement of the first sensing element 110 and the second sensing element 120 may be referred to the description of the corresponding portions above.

In practical application, when the to-be-tested brush motor is a dc permanent magnet brush motor, the signal induction device 100 is fixed according to the above principle, after the to-be-tested dc permanent magnet brush motor 400 is energized, a pair of permanent magnets is still taken as an example of the to-be-tested dc permanent magnet brush motor 400, and assuming that the armature energized polarity and the permanent magnet polarity arrangement of the to-be-tested dc permanent magnet brush motor 400 shown in fig. 4 (a) are correct, a magnetic field as shown in fig. 4 (b) will be formed around the housing of the to-be-tested dc permanent magnet brush motor 400, and for convenience in describing the formed magnetic fields of different types, the armature magnetic field induced by the armature energized of the to-be-tested dc permanent magnet brush motor 400 is shown by dotted lines in the drawings of the present application, and the stator permanent magnet magnetic field of the permanent magnet is shown by solid lines. Similarly, as shown in fig. 4 (c) and 4 (d), the waveform of the first induced voltage signal caused by the armature magnetic field is shown by a dotted line, and the waveform of the second induced voltage signal caused by the stator permanent magnet magnetic field is shown by a solid line, which will not be described in detail.

For the dc permanent magnet brush motor to be tested having the correct permanent magnet polarity arrangement and armature energization polarity shown in fig. 4 (a), if the signal sensing device 100 is disposed within the effective angle β above the dc permanent magnet brush motor to be tested in fig. 4 (b), the waveform of the first induced voltage signal U1 (t) induced by the armature magnetic field induced by the signal sensing device 100 will be shown as a dotted waveform shown in fig. 4 (c), and the waveform of the second induced voltage signal U2 induced by the stator permanent magnet magnetic field induced simultaneously will be shown as a solid waveform shown in fig. 4 (c).

In the process of powering on and starting the direct-current permanent magnet brush motor to be tested, the armature starting current will instantaneously induce an abrupt magnetic field, at this time, the induced voltage signal obtained by the signal induction device 100 will be like the wave head part of the broken line waveform diagram in fig. 4 (c), after the direct-current permanent magnet brush motor to be tested enters the steady operation stage, the smaller working current of the armature will generate a weaker alternating pulsating magnetic field, during this period, the induced voltage signal obtained by the signal induction device 100 has smaller amplitude, like the waveform diagram with smaller amplitude after the wave head part in the broken line waveform diagram in fig. 4 (c), the wave head part can represent the polarity of the armature magnetic field, namely the polarity of the induced voltage signal.

Specifically, as shown in fig. 4 (c), the polarity of the first induced voltage signal U1 (t) induced by the armature magnetic field is positive, and the polarity of the second induced voltage signal U2 induced by the stator permanent magnet magnetic field is negative, it can be seen that when the signal induction device 100 is located at the position P1 shown in fig. 4 (b), the polarity of the first induced voltage signal induced by the armature magnetic field is opposite to the polarity of the second induced voltage signal induced by the stator permanent magnet magnetic field. Similarly, if the signal sensing device 100 is disposed within the effective angle β below the dc permanent magnet brush motor to be measured in fig. 4 (b), as shown in the position P2 in fig. 4 (b), the signal sensing device obtains the waveform diagram of the first induced voltage signal (shown by the dotted line) and the second induced voltage signal (shown by the solid line), and it can be seen that the polarity of the obtained first induced voltage signal is still opposite to the polarity of the obtained second induced voltage signal.

It can be seen that, assuming that the dc permanent magnet brush motor 400 to be tested has the correct permanent magnet polarity arrangement and the armature energization polarity as shown in fig. 4 (a), the signal sensing device 100 obtains the polarity of the first induced voltage signal induced by the armature magnetic field opposite to the polarity of the second induced voltage signal induced by the stator permanent magnet magnetic field. Therefore, the application can define that when the polarity of the first induced voltage signal induced by the armature magnetic field is opposite to the polarity of the second induced voltage signal induced by the stator permanent magnet magnetic field, the current steering of the DC permanent magnet brush motor to be tested is clockwise steering; otherwise, when the polarity of the first induced voltage signal induced by the armature magnetic field is the same as the polarity of the second induced voltage signal induced by the stator permanent magnet magnetic field, the current steering of the direct current permanent magnet brush motor to be tested is anticlockwise steering. Thus, according to the corresponding relation, the current steering direction of the direct current permanent magnet brush motor to be tested is determined.

In order to further verify the relationship between the polarity of the first induced voltage signal induced by the above-defined armature magnetic field and the second induced voltage signal induced by the stator magnetic field (i.e. the stator permanent magnet magnetic field or the stator exciting magnetic field), and the correspondence between the steering of the corresponding type of the brush motor to be tested, the present application can refer to the above-described analysis method, and respectively change the armature energization polarity and the permanent magnet polarity arrangement of the direct current permanent magnet brush motor to be tested, or change the armature energization polarity arrangement of the armature and the stator exciting coil of the brush motor to be tested, so as to determine the polarity relationship between the first induced voltage signal induced by the armature magnetic field and the second induced voltage signal induced by the corresponding stator magnetic field when the corresponding type of the brush motor to be tested is counter-clockwise, where the process is as follows:

On the basis of fig. 4 (a), the armature energization polarity of the dc permanent magnet brush motor is adjusted, as shown in fig. 5 (a), and the arrangement of the permanent magnets is maintained so that the armature energization polarity is opposite to the armature energization polarity shown in fig. 4 (a), and it is known from the left hand law that the dc permanent magnet brush motor should be reversed counterclockwise.

In view of the magnetic field formed by energizing the dc permanent magnet brush motor, as shown in fig. 5 (b), the magnetic field direction of the stator permanent magnet (the direction indicated by the solid arrow of the magnetic field in the figure) is unchanged, and the armature magnetic field direction is opposite to that in fig. 4 (b). At this time, if the signal sensing device 100 is disposed at the position P1 of fig. 5 (b), the obtained waveform of the first induced voltage signal U1 (t) caused by the armature magnetic field and the obtained waveform of the second induced voltage signal U2 caused by the stator permanent magnet magnetic field are both negative voltage signals as shown in fig. 5 (c); if the signal sensing device 100 is disposed at the position P2 in fig. 5 (b), the waveform of the first induced voltage signal U1 (t) induced by the armature magnetic field and the waveform of the second induced voltage signal U2 induced by the stator permanent magnet magnetic field, both of which are positive voltage signals, are shown in fig. 5 (d).

It can be seen that, after changing the power polarity of the permanent magnet brush generator based on fig. 4 (a), the polarities of the first induced voltage signal and the second induced voltage signal obtained by the signal induction device 100 are the same, whether the signal induction device 100 is disposed within the effective angle β above the dc permanent magnet brush motor to be tested or within the effective angle β below the dc permanent magnet brush motor to be tested in fig. 5 (b).

Similarly, on the basis of fig. 4 (a), only the polarity arrangement of the permanent magnets of the dc permanent magnet brush motor is adjusted, and as shown in fig. 6 (a), the permanent magnets S and N are exchanged, and it is known from the left hand law that the dc permanent magnet brush motor is also reversed counterclockwise.

As is clear from the above analysis, in this case, as shown in fig. 6 (b), if the signal sensing device 100 is provided at the position P1 in fig. 6 (b), the waveform of the first induced voltage signal U1 (t) caused by the armature magnetic field and the waveform of the second induced voltage signal U2 caused by the stator permanent magnet magnetic field, both of which are positive voltage signals, are obtained as shown in fig. 6 (c); if the signal sensing device 100 is disposed at the position P2 in fig. 6 (b), the waveform of the first induced voltage signal U1 (t) induced by the armature magnetic field and the waveform of the second induced voltage signal U2 induced by the stator permanent magnet magnetic field, both of which are negative voltage signals, are shown in fig. 6 (d).

It can be seen that, on the basis of fig. 4 (a), after only changing the polarity arrangement of the permanent magnets, the polarities of the first induced voltage signal and the second induced voltage signal obtained by the signal induction device 100 are the same, whether the signal induction device 100 is disposed within the effective angle β above the dc permanent magnet brush motor to be tested or within the effective angle β below the dc permanent magnet brush motor to be tested in fig. 6 (b).

Similarly, in practical application, when the to-be-tested brushed motor is an excited brushed motor, the signal induction device 100 is fixed according to the principle described above, after the to-be-tested brushed motor 400 is energized, only one pair of exciting magnetic poles is used as an example for the to-be-tested excited brushed motor 400, and if the arrangement of the polarities of the armature and the exciting magnetic poles of the to-be-tested excited brushed motor 400 shown in fig. 7 (a) after the direct current is applied is correct, then a magnetic field as shown in fig. 7 (b) will be formed around the housing of the to-be-tested excited brushed motor 400, and for convenience in describing the formed different types of magnetic fields, the armature magnetic field induced by the energizing of the armature of the to-be-tested excited brushed motor 400 is shown by dotted lines in the drawings of the present application, and the stator exciting magnetic field is shown by solid lines. Similarly, as shown in fig. 7 (c) and 7 (d), the waveform of the first induced voltage signal caused by the armature magnetic field is shown by a broken line, and the waveform of the second induced voltage signal caused by the stator exciting magnetic field is shown by a solid line, which will not be described in detail.

Based on this, for the to-be-excited brushed motor having the stator excitation with the direct current on and the armature corresponding to the polarity arrangement illustrated in fig. 7 (a), if the signal sensing device 100 is disposed at the position P1 within the effective angle β above the to-be-excited brushed motor in fig. 7 (b), the waveform of the first induced voltage signal U1 (t) induced by the armature magnetic field induced by the signal sensing device 100 will be as shown in the dotted waveform of fig. 7 (c), while the waveform of the second induced voltage signal U2 (t) induced by the stator excitation magnetic field induced will be as shown in the solid waveform of fig. 7 (c).

Therefore, in the actual test of the to-be-tested excited brush motor, similar to the test process of the to-be-tested direct-current permanent magnet brush motor, in the starting process of the to-be-tested excited brush motor to be connected with direct current, the armature starting current of the to-be-tested excited brush motor will instantly induce an abrupt magnetic field, at this time, the induced voltage signal obtained by the signal induction device 100 will be like the wave head part of the dotted waveform chart of fig. 7 (c), after that, after the to-be-tested excited brush motor enters the steady operation stage, the smaller working current of the armature of the to-be-tested excited brush motor will generate a weaker alternating pulsating magnetic field, during this period, the induced voltage signal obtained by the signal induction device 100 has smaller amplitude, like the waveform chart with smaller amplitude after the wave head part in the dotted waveform chart of fig. 7 (c), the wave head part can represent the polarity of the armature magnetic field, namely the polarity of the induced voltage signal.

Specifically, as shown in fig. 7 (c), the polarity of the first induced voltage signal U1 (t) induced by the armature magnetic field is positive, and the polarity of the second induced voltage signal U2 (t) induced by the stator exciting magnetic field is negative, it can be seen that when the signal induction device 100 is located at the position P1 shown in fig. 7 (b), the polarity of the first induced voltage signal induced by the armature magnetic field is opposite to the polarity of the second induced voltage signal induced by the stator exciting magnetic field. Similarly, if the signal sensing device 100 is disposed within the effective angle β below the brush motor to be excited in fig. 7 (b), as shown in the position P2 in fig. 7 (b), the signal sensing device obtains the waveform diagram of the first induced voltage signal (shown by the dotted line) and the second induced voltage signal (shown by the solid line), and it can be seen that the polarity of the first induced voltage signal and the polarity of the second induced voltage signal obtained at this time are still opposite.

As can be seen, assuming that the brush motor 400 to be excited is correctly aligned in the stator excitation polarity and the armature energization polarity is as shown in fig. 7 (a), the signal induction apparatus 100 obtains the polarity of the first induced voltage signal induced by the armature magnetic field opposite to the polarity of the second induced voltage signal induced by the stator excitation magnetic field. Therefore, the present application can define that the current steering of the to-be-measured excited brush motor is a clockwise steering when the polarity of the first induced voltage signal induced by the armature field is opposite to the polarity of the second induced voltage signal induced by the stator field; conversely, when the polarity of the first induced voltage signal induced by the armature magnetic field is the same as the polarity of the second induced voltage signal induced by the stator field, the current steering of the excited brushed motor to be tested is a counter-clockwise steering. Thus, according to the corresponding relation, the current steering direction of the exciting brush motor to be tested is determined.

The verification process of the to-be-detected excited brush motor is similar to the verification process of the to-be-detected direct current permanent magnet brushed motor, the exciting and energizing polarity of the stator of the excited brush motor is changed on the basis of fig. 7 (a), the exciting and energizing polarity mode of the armature is kept unchanged as shown in fig. 8 (a), and the fact that the excited brush motor is anticlockwise reversed is known according to the law of left hand.

From the magnetic field of the excited brush motor, as shown in fig. 8 (b), the stator excitation magnetic field direction (the direction in which the solid magnetic field arrow points in the figure) is changed, and the armature magnetic field direction is the same as that in fig. 7 (b). At this time, if the signal sensing device 100 is provided at the position P1 of fig. 8 (b), the waveform of the first induced voltage signal U1 (t) caused by the armature magnetic field and the waveform of the second induced voltage signal U2 (t) caused by the stator exciting magnetic field, which are obtained, are both positive voltage signals, are shown in fig. 8 (c); if the signal sensing device 100 is provided at the position P2 in fig. 8 (b), the waveform of the first induced voltage signal U1 (t) caused by the armature magnetic field and the waveform of the second induced voltage signal U2 (t) caused by the stator exciting magnetic field, which are obtained, are both negative voltage signals, are shown in fig. 8 (d). It can be seen that, after changing the stator excitation polarity of the excited brush generator based on fig. 7 (a), the polarities of the first induced voltage signal and the second induced voltage signal obtained by the signal induction device 100 are the same, whether the signal induction device 100 is disposed within the effective angle β above the excited brush motor to be measured or within the effective angle β below the excited brush motor to be measured in fig. 8 (b).

If the armature polarity of the excited brush motor is changed only in addition to the above-described fig. 7 (a), it is known from the left hand law that the excited brush motor is also inverted counterclockwise at this time as shown in fig. 9 (a). In this case, as shown in fig. 9 (b), when the signal induction device 100 is provided at the position P1 in fig. 9 (b), the waveform of the first induced voltage signal U1 (t) caused by the armature magnetic field and the waveform of the second induced voltage signal U2 (t) caused by the stator exciting magnetic field, which are obtained, are both negative voltage signals, are shown in fig. 9 (c); if the signal sensing device 100 is disposed at the position P2 in fig. 9 (b), the waveform of the first induced voltage signal U1 (t) caused by the armature magnetic field and the waveform of the second induced voltage signal U2 (t) caused by the stator exciting magnetic field, which are obtained, are both positive voltage signals, are shown in fig. 9 (d). It can be seen that, on the basis of fig. 7 (a), after only changing the current polarity of the armature, the polarities of the first induced voltage signal and the second induced voltage signal obtained by the signal induction device 100 are the same, whether the signal induction device 100 is disposed within the effective angle β above the to-be-excited brushed motor or within the effective angle β below the to-be-excited brushed motor in fig. 9 (b).

Based on the above analysis and verification process for different types of brush motors, if the polarity arrangement of the permanent magnet and the armature current of the dc permanent magnet brush motor to be tested are as shown in fig. 4 (a), or if the stator excitation and the armature polarity arrangement of the exciting brush motor to be tested are as shown in fig. 7 (a) after the exciting brush motor is connected to the forward current, the correct turning of the brush motor to be tested is clockwise, the polarity of the detected first induced voltage signal induced by the armature magnetic field is necessarily opposite to the polarity of the detected second induced voltage signal induced by the corresponding stator magnetic field; and when the brush motor to be tested is turned anticlockwise by mistake, the polarity of the detected first induced voltage signal caused by the armature magnetic field is necessarily the same as the polarity of the second induced voltage signal caused by the corresponding stator magnetic field. Therefore, after the control circuit receives the first induced voltage signal and the second induced voltage signal sent by the signal sensing device, the current steering direction of the brush motor to be tested can be determined by judging the polarity relation of the first induced voltage signal and the second induced voltage signal, such as the same or opposite polarities, according to the steering judgment rule.

The number of permanent magnets or the number of pole pairs of the stator excitation in the brush motor to be measured is not limited to the above-described one pair, and may be plural pairs. When the motor comprises a plurality of pairs of permanent magnets or a plurality of pairs of stator excitation pairs, the specific detection process of the steering is similar to the corresponding detection process of the DC permanent magnet brush motor to be detected with a pair of permanent magnets or the excitation brush motor with a pair of excitation magnetic poles, and the application is not described in detail herein.

In addition, since the permanent magnet polarity arrangement and the armature energization polarity state of the different types of the to-be-tested direct-current permanent magnet brushed motors can be different, the arrangement states of the exciting coil and the armature energization polarity of the different types of the to-be-tested exciting brushed motors can also be different, and the correct steering of the corresponding types of to-be-tested brush motors (i.e., the to-be-tested direct-current permanent magnet brushed motors or the to-be-tested exciting brushed motors) can be clockwise steering or anticlockwise steering, after the current steering of the corresponding types of to-be-tested brush motors is determined to be clockwise steering or anticlockwise steering, the current steering of the obtained to-be-tested brush motors can also be judged by comparing with the steering rules of the corresponding types of standard sample brushed motors.

Therefore, the application can determine and store the polarity combination result of the first induced voltage signal caused by the armature magnetic field and the second induced voltage signal caused by the stator magnetic field and the corresponding steering by sampling the standard sample brush motor according to the analysis method, thereby realizing the further judgment of the current steering of the brush motor to be detected according to the mode.

In addition, for the detection of the excited brush motor, if the excited brush motor to be detected shown in fig. 7 (a) is turned on with reverse direct current, as shown in fig. 10 (a), the same analysis method is adopted, the steering of the excited brush motor to be detected is still clockwise, and the determination result of whether the steering is correct or not, which is the same as the direct current of the excited brush motor to be detected, is further obtained by analysis, that is, the method and the result of the same excited brush motor to be detected, in which the polarity of the power supply sources of the armature and the stator exciting coil are simultaneously changed, so that the steering determination is not affected.

Further, if the brush motor to be excited illustrated in fig. 7 (a) is powered on with an alternating current, a signal sensing device is disposed in an effective detection area of the generated armature magnetic field and the stator exciting magnetic field to obtain a first induced voltage signal U1 (t) induced by the armature magnetic field and a second induced voltage signal U2 (t) induced by the stator exciting magnetic field at the positions where the signal sensing device is located, as illustrated in fig. 11 (a), the signals U1 (t) and U2 (t) are in opposite phases; if the brush motor to be excited illustrated in fig. 8 (a) and 9 (a) is energized with an alternating current, a first induced voltage signal U1 (t) induced by an armature magnetic field and a second induced voltage signal U2 (t) induced by a stator field are obtained at the same position, and as illustrated in fig. 11 (b), U1 (t) and U2 (t) are in phase.

In summary, the signal sensing device is arranged in the effective detection area of the armature magnetic field and the stator magnetic field generated after the brush motor to be tested is electrified to obtain the first induced voltage signal caused by the armature magnetic field and the second induced voltage signal caused by the stator magnetic field at the position of the signal sensing device, so that the control circuit determines the current steering of the brush motor to be tested according to the pre-stored steering judgment rule of the brush motor to be tested and outputs the current steering according to the polarity or phase sequence relation of the first induced voltage signal and the second induced voltage signal, and meanwhile, the pre-stored steering rule of the standard brush motor of the corresponding type can also be used for judging whether the current steering of the brush motor to be tested, which is determined according to the mode, is correct, so that a detector can know whether the current steering of the brush motor to be tested meets the steering requirement of the brush motor to be tested.

Therefore, the detection system is arranged in the space around the brush motor to be detected, the current steering of the brush motor to be detected can be detected, the detection process is simple, the problems of mechanical contact and abrasion are avoided, the detection system is simple in structure and easy to realize, and the detection method provided by the application can be suitable for the steering detection of the direct-current permanent magnet brush motor, can also be suitable for the steering detection of the exciting brush motor, and is very practical.

As another embodiment of the present application, as shown in fig. 12, the control circuit 200 in the above embodiment may specifically include: a first signal processing circuit 210, a second signal processing circuit 220, a discrimination circuit 230, a memory 240, and a controller 250, wherein:

in the case that the signal sensing device 100 includes two magnetic sensors, i.e., the first magnetic sensor 110 and the second magnetic sensor 120, the first signal processing circuit 210 may be connected to the first magnetic sensor 110 to process the first induced voltage signal sent by the first magnetic sensor 110, such as noise reduction, amplification, etc., which is not limited in this application, and may be determined according to practical needs.

Similarly, the second signal processing circuit 220 may be connected to the second magnetic sensor 120, and is used for processing the second induced voltage signal sent by the second magnetic sensor 120, and the specific processing method of the second induced voltage signal is not limited in the present application.

Alternatively, when the signal sensing device 100 includes only one magnetic sensor, i.e., the third magnetic sensor, the first signal processing circuit 210 and the second signal processing circuit 220 may be connected to the third magnetic sensor, so as to perform corresponding processing on the first induced voltage signal and the second induced voltage signal sent by the third magnetic sensor, which are similar to the above-described example in which the signal sensing device 100 includes two magnetic sensors, which is not described in detail in the present disclosure.

The determining circuit 230 may be connected to the first signal processing circuit 210 and the second signal processing circuit 220, and may directly identify the polarities of the first induced voltage signal and the second induced voltage signal after receiving the processed first induced voltage signal and the second induced voltage signal sent by the two processing circuits, that is, the positive voltage signal or the negative voltage signal, and determine the polarities of the first induced voltage signal by identifying the wave head portion of the first induced voltage signal. The discrimination circuit 230 may also identify the phase sequence of the two induced voltage signals during detection of an ac powered brush motor.

The controller 250 may be connected to the determining circuit 230 and the memory 240, and determine the current steering of the brush motor to be tested according to the steering determination rule of the brush motor to be tested obtained from the memory 240, i.e. clockwise steering or anticlockwise steering, by using the determined polarity relationship (i.e. same polarity or opposite polarity) or phase sequence relationship (which is the phase sequence relationship that needs to be used for detecting the exciting brush motor supplied with ac power) of the first induced voltage signal and the second induced voltage signal, and further determine whether the current steering of the brush motor to be tested is correct steering by using the steering rule of the standard brush motor pre-stored in the memory 240.

The specific implementation process of the controller 250 may refer to the description of the corresponding parts of the above embodiment, and this embodiment is not repeated here.

Optionally, in practical application, the above circuits in the control circuit 200 may be disposed in the same housing, where the control circuit 200 is used as an independent device to connect with other devices in the detection system; of course, each circuit in the control circuit 200 may be divided into a plurality of independent components, and the components are connected to implement different functions according to the need, which will not be described in detail herein.

In summary, the signal induction device is arranged at a proper position of the brush motor to be detected, when the brush motor to be detected is electrified, an armature of the brush motor to be detected triggers and diffuses an armature magnetic field around the shell of the brush motor to be detected, and a stator permanent magnet or a stator exciting coil triggers and diffuses a magnetic field around the shell of the brush motor to be detected, so that two induction voltage signals respectively triggered by the armature magnetic field and a corresponding stator permanent magnet magnetic field or a stator exciting magnetic field are obtained, steering detection of the brush motor to be detected is realized by utilizing the two induction voltage signals, a grating encoder is not required to be arranged, the detection process is simplified, and mechanical abrasion caused by contact between a leaning wheel of the grating encoder and a shaft of the brush motor to be detected does not exist.

Optionally, for each of the above embodiments, in practical application, each device or circuit in the detection system provided by the present application may be disposed in the same housing; the device can also be independently arranged in different shells, at the moment, staff can set the connection relation of the device or the circuit through wires or other communication modes according to actual detection requirements, and the installation position of each device is determined, so that the device is flexible and convenient.

Based on this, as an embodiment of the present application, the signal sensing device 100 and the control circuit 200 may be disposed in the same housing, and may be integrated on one circuit board if necessary, but not limited thereto. In this case, the detection system provided by the application can perform trigger control through external equipment (such as computer equipment, etc.), specifically, the detection system can also include a communication circuit arranged in the shell and connected with the control circuit 200, and a user can make the external equipment send a trigger instruction to the control circuit through the communication circuit by operating the external equipment, so that the control circuit 200 triggers the signal sensing device 100 to enter a working state; meanwhile, the judgment result obtained by the control circuit 200 and the current steering of the brush motor 400 to be tested can also be sent to the external device through the communication circuit, and the detection result is directly displayed or broadcasted by the external circuit.

The communication circuit may include an I/O (input/output) bus, or other wired communication module or wireless communication module, etc. to implement information interaction between the control circuit and the external device. The specific configuration of the communication circuit is not limited in the present application.

In addition, the communication circuit may be included in the control circuit, or may be provided as a separate circuit in the housing, and the present application is not limited to the location of the communication circuit, and the connection relationship of the communication circuit in different embodiments may be determined according to the actual need by combining the above description, which is not shown in the drawings of the specification of the communication circuit, which is not described here.

In addition, for the above-mentioned external device, besides the signal sensing device can be triggered to work by the control circuit, the power supply device can be triggered to supply power to the brush motor to be tested, that is, the external device can also be connected with the power supply device 300, as shown in fig. 13, the user operates the external device, triggers the switch circuit 500 to enter the working state by the control circuit 200, starts the operation of the brush motor 400 to be tested, and then triggers the signal sensing device 100 by the control circuit 200 to start the detection work according to the above-mentioned manner, and the specific detection process is not described herein.

Alternatively, referring to fig. 2 and 3, the detection system of the present application may also include a signal output circuit 600 disposed in the housing, and the signal output circuit 600 directly outputs the determination result obtained by the control circuit 200 and the information such as the current steering of the brush motor 400 to be detected. In practical application, the signal output circuit 600 may be integrated in the control circuit 200, or may be used as an independent device, for example, disposed outside the housing where the signal sensing device 100 and the control circuit are located, and the working principle is similar, so that a worker can conveniently learn the detection result of the brush motor to be detected through the signal output circuit 600.

In the present application, the signal output circuit 600 may be a display and/or a voice device, and after determining the current steering direction of the brush motor to be tested and the determination result of whether the current steering direction is the correct steering direction, the information may be displayed by the display or the information may be played by the voice device, so that the inspector can determine whether the current steering direction of the brush motor to be tested meets the preset steering requirement of the brush motor to be tested.

In addition to the above-listed display or broadcasting modes, various types of information such as steering and judgment results can be indicated by different indicator lamps, and after the information is detected in the above-mentioned modes, the detection results are informed to the detector by controlling the corresponding indicator lamps to emit light, and of course, a prompting device such as a buzzer capable of emitting different sounds can be used instead of the indicator lamps, and the application is not described in detail here.

It can be seen that the specific circuit structure of the signal output circuit 600 is not limited, that is, the output mode of the obtained information such as the current steering direction of the dc motor to be tested and the determination result of whether the current steering direction is correct is not limited

As a further embodiment of the present application, the signal sensing device 100 and the control circuit 200 may be provided in two first housings independent of each other, and a corresponding communication port is provided outside each first housing so that connection between devices or circuits is achieved through the communication port, unlike the above-described embodiments. Alternatively, the first magnetic sensor 110, the second magnetic sensor 120, and the control circuit 200 may be disposed in three separate second housings. Therefore, the first magnetic sensor 110 and the second magnetic sensor 120 in the signal sensing device 100 may be disposed in the same housing, or may be disposed in different housings, and used as independent devices, so as to facilitate the installation of each magnetic sensor.

Furthermore, on the basis of the above-described embodiment, the detection system provided by the present application may further include a signal output circuit 600, and in this case, the signal output circuit 600 described above may be disposed in a housing in which the control circuit 200 is located, similarly to the positional relationship of other devices; or may be provided in a third housing different from the above-described first and second housings, i.e., as an independent device, for outputting the judgment result obtained by the control circuit 200 and the information of the current steering of the brush motor to be measured, etc. The specific structure of the signal output circuit 600 may be referred to the description of the corresponding parts of the above embodiment, and the present embodiment will not be described in detail herein.

As a further embodiment of the present application, in order to implement output of a detection result and flexible control of a detection system based on the above embodiment, the present application may also establish communication connection between an external device and the control circuit 200, the power supply device 300 and the switch circuit 500, respectively, with reference to fig. 13, so that a user starts the power supply device to supply power to the brush motor to be detected by operating the external device, and triggers the signal sensing device 100 to start detection, and a specific process may refer to the related description of the above embodiment about the external device, which is not repeated herein.

In the embodiment in which the magnetic sensors in the signal sensing device 100 are used as independent devices and are disposed in different housings, the magnetic sensors may be disposed at different positions around the housing of the brush motor to be tested according to actual detection requirements, so as to detect the magnetic fields of the stator and the armature respectively, and specific detection contents may be referred to the description of the corresponding parts. The application is based on the principle of convenient installation and effective signal detection, and the installation position of each magnetic sensor is determined, and is not limited to the position shown in the drawings of the specification.

In addition, for the power supply device 300 and the switch circuit 500 in the above embodiments, they may be disposed in the same housing, and the corresponding structure is not shown in the drawings; the signal sensing device 100 may be used as a single device in the same case as the control circuit 200, the signal output circuit 600, and the like, and may be used as a stand-alone device to perform signal detection by being placed at a suitable position, as shown in fig. 14. It should be noted that, the structure of the detection system provided by the present application is not limited to several connection structures provided by the accompanying drawings, and various detection system structures meeting the actual needs can be flexibly combined according to the above description, which all belong to the protection scope of the present application, and the present application is not listed here.

As a further embodiment of the present application, after the control circuit 200 processes the first induced voltage signal obtained by the first sensing element 110 and the second induced voltage signal obtained by the second sensing element (or after the control circuit 200 processes the first induced voltage signal obtained by the third sensing element) and directly sends the processed first induced voltage signal and second induced voltage signal to the signal output circuit or the external device for outputting, so that the inspector can intuitively know the polarity relationship between the first induced voltage signal and the second induced voltage signal, and further determine the current steering of the brushed motor to be tested according to the steering judgment rule of the brushed motor to be tested, that is, the polarity relationship between the two induced voltage signals and the corresponding relationship of the steering, and further verify whether the current steering of the brushed motor to be tested is correct through comparing with the steering rule of the brushed motor to be tested.

In addition, on the basis of the above embodiment, the present application may further provide various prompting circuits and external plug-in ports on the circuit board where the control circuit 200 is located, and after the control circuit 200 obtains the current steering of the brush motor to be tested and the determination result of determining whether the current steering is correct, the control circuit may also output different prompting signals through the prompting circuits to represent these information.

Alternatively, the prompting circuit may include a plurality of indicator lights, and the present application may use one indicator light to represent one information, or use different states of the indicator light to represent different information, or the like, which is not limited in this aspect of the present application.

Similarly, if the prompting circuit includes a buzzer, different sounds can be sent to represent different information, and the specific prompting mode of the prompting device for providing the information obtained by the current control circuit 200 of the user is not limited in the present application.

Optionally, the present application can also implement a prompt function for the detection result through a prompt circuit in the external device, and the prompt mode is similar to the description of the prompt circuit.

On the basis of the above embodiments, as shown in fig. 14, the detection system provided by the present application may further include: base plate 700 and bracket 800, wherein:

the bracket 800 may be mounted on the base plate 700, and the brush motor 400 to be tested may be disposed on the bracket 800, and the signal sensing device 100 may be disposed on the base plate 700, and it should be noted that, when the signal sensing device 100 is mounted, the above-described position requirement needs to be satisfied, that is, it is located in an effective detection area of the armature magnetic field and the stator magnetic field of the brush motor to be tested after the brush motor is energized, specifically, may be located in a first preset range from the surface of the brush motor to be tested and forms a first angle with a central radial line of a permanent magnet or a stator exciting coil of the brush motor to be tested, and the first angle is smaller than the above-described effective angle β, and the specific setting requirement may be referred to the description of the corresponding part of the above embodiment.

It should be noted that, in the practical application of the present application, the bracket 800 is not limited to the installation manner shown in fig. 14, and may be installed arbitrarily according to the practical needs, such as horizontal installation, vertical installation, or installation on an inclined plane with an arbitrary inclination angle, etc., and the specific installation manner of the bracket 800 is not limited. Accordingly, the installation mode and the external structure of the brush motor to be tested can be arbitrarily adjusted according to the position of the bracket 800, and are not limited to the mode shown in fig. 14.

In addition, in the actual detection process of the present application, after the installation position of the signal sensing device 100 relative to the brush motor 400 to be detected is determined in the above manner, the installation position of the signal sensing device 100 will be fixed in the detection process of the brush motor 400 to be detected; after the model number or the detection environment of the brush motor 400 to be detected changes, the installation position of the signal sensing device 100 relative to the brush motor to be detected can be redetermined according to the above manner, and then the detection of the brush motor to be detected is started, and the signal sensing device 100 is also fixed in the detection process, so that the reliability and the accuracy of the detection result of the brush motor 400 to be detected are ensured.

As shown in fig. 15, a flowchart of an embodiment of a method for detecting a brushed motor according to the present application may be applied to the detecting system of a brushed motor described in the above system embodiments, and the method may specifically include the following steps:

step S11: and controlling the power supply device to supply power to the brush motor to be tested.

As described in the corresponding parts of the system embodiments, for different types of brush motors to be tested, the application can adopt the power supply device with corresponding structure to supply power to the brush motors, for example, when the brush motors to be tested are direct-current permanent-magnet brush motors, the application can directly control the direct-current programmable power supply to supply power to the direct-current permanent-magnet brush motors to be tested, and can also control the switch circuit to supply power to the direct-current permanent-magnet brush motors to be tested by the mains supply rectifying power supply, so that the application does not limit the specific power supply mode.

When the brush motor to be tested is an excited brush motor, the application can utilize the AC programmable power supply to supply power to the brush motor, and can also control the switch circuit to supply power to the brush motor by the mains current supply, and the like, and the application is not described in detail herein.

With the description of the system embodiment on the structure of the detection system, the power supply device can be triggered to work by external equipment, and also can be directly started by a user to enter a working state by a working button.

Step S12: a first induced voltage signal caused by an armature magnetic field at the position of the signal induction device and a second induced voltage signal caused by a stator magnetic field are obtained.

In practical application of the embodiment, before detection, the signal sensing device may be fixed in an effective detection area of the armature magnetic field and the stator magnetic field of the brush motor to be detected after the brush motor is energized, and specific setting requirements refer to the description of the corresponding parts of the system embodiment.

Based on the description of the corresponding parts of the system embodiment, it can be known that when the brush motor to be tested is a dc permanent magnet brush motor, the stator magnetic field is a designated sub-permanent magnet magnetic field, at this time, the second induced voltage signal is specifically an induced voltage signal induced by the stator permanent magnet magnetic field, and the effective detection area is an area determined by the armature magnetic field and the stator permanent magnet magnetic field of the dc permanent magnet brush motor to be tested after being electrified.

When the brush motor to be tested is an excited brush motor, the stator magnetic field may be a stator exciting magnetic field, and the second induced voltage signal is specifically an induced voltage signal induced by the stator exciting magnetic field, and at this time, the effective detection area is an area determined by an armature magnetic field and a stator exciting magnetic field of the excited brush motor to be tested.

Alternatively, the present application may acquire a first induced voltage signal induced by an electromagnetic field by a first induction element in the signal induction device, and acquire a second induced voltage signal induced by a stator magnetic field (i.e., a stator permanent magnet magnetic field or a stator exciting magnetic field) by a second induction element, but is not limited thereto.

Since the armature magnetic field generally includes the abrupt magnetic field generated when the brush motor to be tested is just started up and the alternating pulsating magnetic field after the steady operation, the first induced voltage signal obtained by the present application generally includes the abrupt voltage signal of the wave head portion and the steady state signal corresponding to the steady operation, as shown in fig. 4 (c) and (d), fig. 5 (c) and (d), fig. 6 (c) and (d), fig. 7 (c) and (d), fig. 8 (c) and (d), fig. 9 (c) and (d), fig. 10 (c) and (d), and the dotted line waveform diagrams in fig. 11 (a) and (b).

Step S13: and determining the current steering of the brush motor to be tested according to a pre-stored steering judgment rule of the brush motor to be tested by utilizing the characteristic relation between the obtained first induced voltage signal and the second induced voltage signal.

In the application, according to the analysis of the corresponding parts of the embodiment of the system, the steering direction of the brush motor to be tested is related to the polarities or the phase sequences of the armature magnetic field and the stator magnetic field generated after the brush motor is electrified, and the polarities of the armature magnetic field and the stator magnetic field are represented by the polarities of the first induction voltage signal and the second induction voltage signal after the induction directions of the first magnetic sensor and the second magnetic sensor are determined.

Analysis of the example shows that when the polarities of the first induced voltage signal and the second induced voltage signal are opposite, the brush motor to be tested turns clockwise after being electrified; otherwise, when the polarities of the first induced voltage signal and the second induced voltage signal are the same, the brush motor to be tested turns anticlockwise after being electrified. The application can take the corresponding relation between the polarity relation of the two induced voltage signals and the steering of the brush motor to be detected as the steering judgment rule, and sends the steering judgment rule to the memory for storage so as to be called in the detection process.

Based on this, in the present embodiment, when it is determined that the polarity of the first induced voltage signal is opposite to the polarity of the second induced voltage signal, the current steering of the brush motor to be tested is clockwise steering; otherwise, when the polarity of the first induced voltage signal is determined to be the same as the polarity of the second induced voltage signal, the current steering of the brush motor to be tested is anticlockwise.

Optionally, in the detection process of the exciting brush motor to be detected powered by the alternating current, the current steering direction of the exciting brush motor can be determined by using the phase sequence relation between the first induced voltage signal and the second induced voltage signal, and the specific process can refer to the description of the corresponding part of the embodiment of the system, so that the implementation is not repeated here.

It can be seen that the characteristic relationship between the first induced voltage signal and the second induced voltage signal in step S13 may include a polarity relationship and a phase sequence relationship, and may be specifically determined according to whether the supply current is ac or dc.

Step S14: and judging whether the current steering of the brush motor to be tested is correct steering or not by utilizing the steering rule of the pre-stored standard sample brush motor.

The steering rule of the standard brush motor can indicate whether the correct steering of the brush motor to be tested is clockwise steering or anticlockwise steering, and the specific storage mode of the content of the steering rule is not limited by the application.

In addition, it should be noted that, when detecting different types of brush motors to be detected, the steering rule of the brush motor is determined by using a pre-stored standard sample of the corresponding type.

Step S5: and outputting the current steering and judging result of whether the brush motor to be tested is correctly steered or not.

In practical application, the display can be used for directly displaying the information such as the current steering of the brush motor to be detected and the judging result of whether the current steering is correct or not, and the voice device can be used for broadcasting the information and the like; of course, the detection result may be transmitted to an external device for output, if necessary. That is, the present application is not limited to a specific output mode of information such as the current steering direction of the brush motor to be tested and a determination result of whether the current steering direction is correct, and reference may be made to the description of the corresponding parts of the above system embodiment, which is not listed here.

In summary, in this embodiment, by setting the signal sensing device in the effective detection area of the armature magnetic field and the stator magnetic field generated after the brush motor to be tested is powered on, the first induced voltage signal induced by the armature magnetic field and the second induced voltage signal induced by the stator magnetic field at the position where the signal sensing device is located are obtained, so that the control circuit determines the current steering of the brush motor to be tested and outputs the current steering according to the pre-stored steering judgment rule of the brush motor to be tested, and meanwhile, the pre-stored steering rule of the standard sample brush motor of the corresponding type can be used to judge whether the current steering of the brush motor to be tested determined according to the above manner is correct steering, and the judgment result is output, so that the detection personnel can know whether the current steering of the brush motor to be tested meets the steering requirement. Therefore, the application has simple steering detection process for the brush motor, has no mechanical abrasion problem, has simple detection system structure, is easy to realize, can be suitable for the direct-current permanent magnet brush motor and the exciting brush motor, and is very practical.

Finally, it should be noted that, in connection with the above embodiments, relational terms such as first and second, and the like are used solely to distinguish one operation or entity from another operation or entity in order to facilitate describing a process or connection, and do not necessarily require or imply any such actual relationship or order between such entities or operations.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the method disclosed in the embodiment, since the method corresponds to the system disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the system part.

For convenience of description, the detection of the dc permanent magnet brush motor is only performed by taking the dc permanent magnet brush motor with a pair of magnetic poles and a pair of carbon brushes as an example, and based on a similar working principle, the present application can also perform steering detection on the dc permanent magnet brush motor with a plurality of pairs of magnetic poles and a plurality of carbon brushes, which is not listed here. Similarly, the detection of the exciting brush motor is performed by taking only one pair of exciting poles as an example, and the detection and analysis process of the plurality of pairs of exciting poles is similar, and the application is not described in detail.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. 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 application. Thus, the present application 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

1. A system for detecting a brushed motor, said system comprising: signal induction device, control circuit and power supply unit, wherein:

the signal induction device is arranged in an effective detection area of the brush motor to be detected, a first induced voltage signal caused by an armature magnetic field at the position of the effective detection area and a second induced voltage signal caused by a stator magnetic field are obtained, and the effective detection area is determined by the armature magnetic field and the stator magnetic field generated in a surrounding space of the brush motor to be detected after the brush motor to be detected is electrified;

the control circuit is respectively connected with the signal sensing device and the signal output circuit, determines the current steering of the brush motor to be tested according to a pre-stored steering judgment rule of the brush motor to be tested by utilizing the characteristic relation of the first sensing voltage signal and the second sensing voltage signal, judges whether the current steering of the brush motor to be tested is correct or not by utilizing the pre-stored steering rule of the standard brush motor, and obtains a judgment result and the current steering of the brush motor to be tested;

The power supply device is connected with the brush motor to be tested.

2. The system of claim 1, wherein the system further comprises a controller configured to control the controller,

3. The system of claim 1, wherein the signal sensing means comprises: a first magnetic sensor and a second magnetic sensor arranged at a first angle to the magnetic induction direction, wherein:

And the second magnetic sensor acquires a second induced voltage signal caused by the stator magnetic field at the position.

4. The system of claim 1, wherein the signal sensing means comprises: a third magneto-sensitive element;

the magnetic induction direction of the third magnetic sensor forms a second angle with the central axis of the brush motor to be detected, and the second angle is not equal to 0 degree, 90 degrees, 180 degrees and 270 degrees.

5. A system according to claim 3, wherein the control circuit comprises: the device comprises a first signal processing circuit, a second signal processing circuit, a judging circuit, a memory and a controller, wherein:

the distinguishing circuit is respectively connected with the first signal processing circuit and the second signal processing circuit and is used for identifying the polarity or phase sequence of the processed first induced voltage signal and the processed second induced voltage signal;

6. The system of claim 5, wherein the signal sensing device and the control circuit are disposed within a same housing, the system further comprising:

7. The system of claim 5, wherein the signal sensing device and the control circuit are disposed in two first housings that are independent of each other, or the first magnetic sensor, the second magnetic sensor, and the control circuit are disposed in three second housings that are independent of each other, respectively; the system further comprises a signal output circuit, wherein:

the signal output circuit is arranged in a first shell where the control circuit is located or in a third shell which is different from the first shell and the second shell, and outputs the judgment result obtained by the control circuit and the current steering direction of the brush motor to be tested.

8. The system according to claim 6 or 7, characterized in that the system further comprises:

9. The system of claim 6, wherein the system further comprises: a hint circuit, wherein:

10. A method of detecting a brushed motor, applied to a detection system of a brushed motor according to any one of claims 1 to 9, the method comprising: