A permanent magnet motor anti-blocking control method for a feeding system and a feeding system

Abstract

The present application relates to the technical field of motor control, and particularly relates to a permanent magnet motor anti-blocking control method for a feeding system and the feeding system, the permanent magnet motor provides power for feed conveying in the feeding system, and the method comprises the following steps: respectively calibrating current calibration values and electric angle calibration values within preset time after completing motor magnetic pole pair calibration under rated state; starting the current slow starting mode of the motor, if it is detected that the current and time slope exceeds 1.3-1.6 times of the current calibration value and the electric angle and time slope is lower than 40%-60% of the electric angle calibration value within the set time, it is determined that the feed conveying occurs blocking, and the motor is commanded to stop running. The method provided by the present application determines the current, electric angle and torque condition under the starting state of the motor and executes corresponding actions, so as to realize the control of the anti-blocking of the motor, and the probability of blocking of the feeding system and the artificial and time cost caused by the blocking can be greatly reduced, and the efficiency and service life of the operation of the feeding system are effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of motor control, in particular to a permanent magnet motor anti-stall control method for a feeding system and the feeding system. BACKGROUND

[0002] With the development of large-scale poultry farming industry, the traditional feeding method is usually to pour the prepared feed into several feed troughs by the feeders, which is time-consuming and labor-intensive, and the efficiency is low, which cannot meet the feeding demand of large-scale breeding.

[0003] At present, intelligent feeding systems and feeding systems are gradually replacing traditional feeding methods, which are convenient to operate, time-saving and labor-saving, and can effectively improve the feeding efficiency. For example, the application number CN202021368345.X (the announcement date is April 30, 2021) discloses an electric control poultry intelligent feeding machine, and the application number CN201820282018.9 (the announcement date is December 18, 2018) discloses a plug-in disc type feeding device for livestock feeding, and the application number CN201820378711.6 (the announcement date is March 10, 2019) discloses a plug-in disc type intelligent feeding equipment.

[0004] The above-mentioned patent provides a feeding system to realize the automatic conveying of feed, but there are factors such as the mismatch of the feeding and discharging amount, the bending, and the damp feed, which may cause the motor to stall. The existing method mainly disassembles, investigates and dredges the material line after the blocking occurs, which is time-consuming and labor-intensive, and affects the production efficiency. At the same time, the occurrence of motor stall may also cause damage to the equipment, and it is difficult to predict and prevent the stall. SUMMARY

[0005] In order to solve the problem that the existing feeding system is not easy to handle in the process of conveying feed, the present application provides a permanent magnet motor anti-stall control method for a feeding system, the permanent magnet motor is used to provide power for the feed conveying in the feeding system, and the method comprises the following steps:

[0006] Step S10, respectively pre-calibrate the current and the slope of the electric angle and the time within the preset time after the motor magnetic pole completion in the rated state, and mark them as current calibration value and electric angle calibration value respectively;

[0007] Step S20, start the current slow start mode of the motor, if the current and the time slope exceeds X times of the current calibration value and the electric angle and the time slope is lower than Y1 of the electric angle calibration value within the set time, it is determined that the feed conveying occurs stall, and the motor is driven to stop running; wherein the value range of X is 1.3-1.6, and the value range of Y1 is 40%-60%.

[0008] In an embodiment, in step S20, if it is determined that the feed delivery is stalled, the motor will send a dry contact signal to close the feed inlet and drive the motor into several times of start-stop mode to shake off the feed in the feeding system after the motor is stopped again.

[0009] Then, the motor current slow start mode is started, and it is determined whether the torque of the motor exceeds 1.2 times of the rated torque of the motor. If yes, it is determined that the feed delivery is seriously stalled, the motor is stopped, and an alarm signal is sent for manual troubleshooting. If no, it is determined that the feed delivery is normal, and the motor is normally operated.

[0010] In an embodiment, in step S20, further comprising: if the current-time slope exceeds X times of the current calibration value and the electrical angle-time slope is lower than Y2 of the electrical angle calibration value within the set time, it is determined that the feed delivery is seriously stalled, the motor is stopped, and an alarm signal is sent for manual troubleshooting; wherein Y2 is in the range of 15% to 35%.

[0011] In an embodiment, the set time is in the range of 5S to 10S.

[0012] In an embodiment, the set time is in the range of 1S to 2S.

[0013] In an embodiment, in step S20, the motor is driven into several times of start-stop mode, comprising the following steps:

[0014] The motor is started with a sudden torque of 1.2 times of the current, and the current is maintained for several seconds, and then the motor is stopped, and the above process is repeated for several times.

[0015] In an embodiment, in step S10, the set time is 5S, and in step S20, the set time is 1S.

[0016] In an embodiment, in step S20, the motor current slow start mode is started, and if the current-time slope exceeds 1.5 times of the current calibration value and the electrical angle-time slope is lower than 50% of the electrical angle calibration value within the set time, it is determined that the feed delivery is stalled. If the current-time slope exceeds 1.5 times of the current calibration value and the electrical angle-time slope is lower than 20% of the electrical angle calibration value, it is determined that the feed delivery is seriously stalled.

[0017] In an embodiment, further comprising the following steps:

[0018] Step S30, in the process of normal operation of the motor, the motor current is read in real time, if the current is determined to increase to 1.2 times of the rated current, the motor sends a dry contact signal to close the feeding port of the feeding system; after the feeding port of the feeding system is closed, if the current of the motor is detected to decrease to 0.8 times of the rated current, the dry contact signal is sent again to open the feeding port of the feeding system, and the motor is normally operated; if the current of the motor is detected to continue to increase to 1.5 times of the rated current, the motor is driven to stop running, and the motor is restarted, and the step S20 is repeated.

[0019] The application further provides a feeding system, comprising a feeding system body and a feed conveying power supply permanent magnet motor in the feeding system, and further comprising the permanent magnet motor anti-blocking control method for the feeding system as described above.

[0020] Based on the above, compared with the prior art, the permanent magnet motor anti-blocking control method for the feeding system provided by the application determines the current, electric angle and torque condition of the motor in the starting state and performs corresponding actions, thereby realizing the control of the motor anti-blocking, greatly reducing the probability of material blocking of the feeding system in the running process and the labor cost and time cost caused by the material blocking, and effectively improving the efficiency and service life of the feeding system running.

[0021] Other features and advantages of the application will be set forth in the following description of the application, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the application. The objects and other advantages of the application can be realized and attained by the structure particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor. In the following description, the positional relationship described in the drawings is the direction of the components drawn in the drawings as the reference, unless otherwise specified.

[0023] Figure 1 The flow chart of the permanent magnet motor anti-blocking control method for the feeding system provided by the application;

[0024] Figure 2 The flow chart of the starting blocking control algorithm of the permanent magnet motor anti-blocking control method;

[0025] Figure 3 The flow chart of another embodiment of the permanent magnet motor anti-blocking control method;

[0026] Figure 4 Flow chart of another embodiment of the start-up blockage control algorithm of the permanent magnet motor anti-blockage control method;

[0027] Figure 5 Flow chart of the blockage control in the start-up state and normal operation state of the permanent magnet motor anti-blockage control method;

[0028] Figure 6 Flow chart of the normal operation blockage control algorithm of the permanent magnet motor anti-blockage control method. DETAILED DESCRIPTION

[0029] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. As long as the technical features designed in the different embodiments of the present application do not conflict with each other, they can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0030] In the description of the present application, it should be noted that all the terms (including technical terms and scientific terms) used in the present application have the same meaning as that generally understood by those of ordinary skill in the art to which the present application belongs, and should not be understood as a limitation on the present application; it should be further understood that the terms used in the present application should be understood as having the same meaning as the terms in the context of the present application and the related art, and should not be understood in an idealized or overly formal sense, unless defined explicitly in the present application.

[0031] In a livestock and poultry feeding system, blockage often occurs due to mismatching of the feeding and discharging amounts, bending, and damp feed, etc., thereby causing motor blockage. Not only does it need to be manually disassembled, investigated, and dredged, but also it can directly damage the feeding system in severe cases. In order to reduce the occurrence of the above problems, the present application provides a permanent magnet motor anti-blockage control method for a feeding system, which mainly uses two ways of a start-up blockage control algorithm and a normal operation blockage control algorithm of the permanent magnet motor to reduce the blockage probability of the material line in the running process. The permanent magnet motor is used to provide power for feed conveying in the feeding system, please refer to Figure 1 、 2 The method of the start-up blockage control algorithm comprises the following steps:

[0032] Step S10, respectively pre-calibrate the slope of the current and the electric angle with time within the preset time after the completion of the motor magnetic pole completion in the rated state, and mark them as the current calibration value and the electric angle calibration value, respectively.

[0033] It should be noted that the rated state is the working state of the motor under the rated input and the rated load. In the same set of feeding system, only step S10 needs to be performed once, and the current calibration value and the electric angle calibration value can be saved as the reference data for determining whether the feeding system is blocked each time the motor is started.

[0034] In step S20, the current slow start mode of the motor is started. If it is detected that the current and time slope exceeds X times of the current calibration value, and the electric angle and time slope is lower than Y1 of the electric angle calibration value within the set time, it is determined that the feed conveying is blocked, and the motor is further driven to stop running; wherein the value range of X is 1.3-1.6, and the value range of Y1 is 40%-60%. If the detection is normal, the motor is started to the rated speed to start normal working operation.

[0035] Preferably, after the current slow start mode of the motor is started, it can be further determined whether the current climbs to the rated value. If the rated value is not reached, the current continues to climb and the feed conveying is continuously determined to cause the motor to be blocked. If the rated value is reached, the motor is started to the rated speed to start normal working operation.

[0036] Specifically, the way to determine whether the motor is blocked is mainly to compare the change of the starting current of the permanent magnet motor and the change of the electric angle with the current and the electric angle change under the rated state to determine whether the motor is blocked, which can more accurately determine whether the motor is blocked.

[0037] It should be noted that the current slow start mode is a conventional motor starting mode. Specifically, the current slow start control circuit is used to control the motor output and slowly increase the current to slowly increase the torque. The circuit design can be realized by using conventional technical means, which will not be described here.

[0038] The permanent magnet motor anti-blocking control method for the feeding system provided by the application determines the current, electric angle and torque of the motor in the starting state and performs corresponding actions, thereby realizing the control of the motor anti-blocking, greatly reducing the probability of blocking of the feeding system during operation and the labor cost and time cost caused by blocking, and effectively improving the efficiency and service life of the feeding system.

[0039] Preferably, referring to Figure 3 , 4 In step 20, after it is determined that the feed conveying is blocked and the motor is further driven to stop running, the motor will send a dry contact signal to close the feeding port, and the motor will be driven into several times of the jog start mode to shake the feed in the feeding system;

[0040] Then, the motor current slow start mode is started, and it is determined whether the motor torque exceeds 1.2 times of the rated torque of the motor; if yes, it is determined that the feed conveying is seriously blocked, the motor is stopped, and an alarm signal is sent for manual troubleshooting; if no, it is determined that the feed conveying is normal, and the motor is normally operated.

[0041] For the problem of not serious blocking, the present application starts the jog start mode of the motor to effectively automatically vibrate and loosen the blocked feed, and determines whether the blocking is solved by determining the motor torque state; if yes, it is normally operated; if no, manual troubleshooting is reminded.

[0042] The above control mode can effectively automatically vibrate and loosen the blocked feed, thereby avoiding manual disassembly, inspection and loosening operation each time the blocking problem occurs, reducing manual intervention, and effectively improving the feed conveying efficiency of the feeding system.

[0043] It should be noted that the jog start mode is a high current higher than the original rated current of the motor to increase the torque, thereby driving the feeding system to increase the feeding of the feed, which can be circulated multiple times to loosen the feed blocking. Further, the forward and reverse rotation of the motor can also be adjusted to loosen the feed blocking.

[0044] Preferably, in step S20, it further includes: if the current and time slope exceeds X times of the current calibration value, and the electric angle and time slope is lower than Y2 of the electric angle calibration value within the set time, it is determined that the feed conveying is seriously blocked, the motor is stopped, and an alarm signal is sent for manual troubleshooting; wherein the value range of Y2 is 15% to 35%.

[0045] Specifically, by the above control mode, the blocking degree of the permanent magnet motor is divided into two levels, for the lighter blocking level, the motor several times of the jog start mode can be used to loosen the blocking; for the heavier blocking level, an alarm signal is sent, and manual intervention is used to loosen the blocking, thereby being more beneficial to the protection of the feeding system and the prevention of the blocking, improving the production efficiency while improving the energy saving and emission reduction.

[0046] Preferably, in step S10, the setting range of the preset time is 5S to 10S. Preferably, the preset time is 5S.

[0047] Preferably, in step S20, the setting range of the set time is 1S to 2S. Preferably, the set time is 1S.

[0048] Preferably, in step S20, the driving motor enters several times of the point starting mode, including the following steps: the motor starts with 1.2 times of the current sudden torque, lasts for several seconds, and then stops, and so on. Illustratively, the motor can start with 1.2 times of the current sudden torque for 1S, and then stops, so as to suddenly vibrate the blocked feed to loosen the feed; and so on for three times to ensure that the feed is not blocked again. It should be noted that the sudden current multiple, duration and vibration times can be determined by experiments according to the actual feeding system structure and the feed blocking condition, and the appropriate number of times is selected to ensure that most of the feed can not be blocked, and therefore the specific values are not limited herein.

[0049] Illustratively, in step S20, the current slow starting mode of the motor is started, and if it is detected that the current and time slope exceeds 1.5 times of the current calibration value, and the electric angle and time slope is lower than 50% of the electric angle calibration value within the set time, it is determined that the feed conveying is blocked; if it is detected that the current and time slope exceeds 1.5 times of the current calibration value, and the electric angle and time slope is lower than 20% of the electric angle calibration value, it is determined that the feed conveying is seriously blocked.

[0050] Preferably, referring to Figure 4 , 5 , the method of the normal operation blocking control algorithm comprises the following steps:

[0051] In step S30, during the normal operation of the motor, the motor current is read in real time, and if it is determined that the current increases to 1.2 times of the rated current, the motor sends a dry contact signal to close the feeding port of the feeding system; after the feeding port of the feeding system is closed, if it is detected that the current of the motor decreases to 0.8 times of the rated current, the dry contact signal is sent again to open the feeding port of the feeding system, and the motor is normally operated; if it is detected that the current of the motor continues to increase to 1.5 times of the rated current, the motor is stopped and restarted, and step S20 is repeated.

[0052] Since the motor may temporarily appear slight blocking during operation, if the motor is closed as soon as the blocking is detected, there may be a problem of frequent opening and closing and energy consumption. Therefore, during the normal operation of the motor, if the motor blocking is detected, the feeding port can be closed first, and then it is determined whether the motor current returns to normal, and then the corresponding action is performed. If the motor current returns to normal, it indicates that the motor only temporarily appears slight blocking, and the feeding port can be opened again to continue normal operation. If the motor current increases more, it indicates that the motor blocking becomes serious, and the motor needs to be restarted to solve the corresponding blocking problem by starting the blocking control algorithm. In this way, the blocking judgment mode is more reasonable and accurate, and the problem of frequent opening and closing and energy consumption is avoided.

[0053] It should be noted that the closing of the feeding system feed inlet can be controlled by motor or cylinder cooperating with valve, and the specific setting is according to the actual structure and requirement of the feeding system, which is a routine means for those skilled in the art, and will not be described here. Among them, when the permanent magnet motor detects the locked rotor, the dry contact signal is sent to the motor or cylinder controlling the feed inlet through the driver to control the closing of the feed inlet.

[0054] It should also be noted that during normal operation of the motor, the embodiment is set to determine the action corresponding to the locked rotor by detecting the current of 1.2 times, 0.8 times and 1.5 times of the rated current. According to the above inventive concept, those skilled in the art can select other more optimal multiples to replace them according to actual needs in a reasonable number of experiments, which all fall within the protection scope of the present application.

[0055] The present application also provides a feeding system, which comprises a feeding system body and a permanent magnet motor for providing power for feeding system, and also comprises the permanent magnet motor anti-locking control method for the feeding system as described above. For example, the feeding system body can be a disc feeding device, the permanent magnet motor drives the chain disc to transport the feed, and the above anti-locking control method for the permanent magnet motor is used to realize the automatic transportation of the feed, reduce the influence of the blocked material on the device, reduce the manual intervention, and be more beneficial to the protection of the material line and the prevention of the blocked material, improve the energy saving and emission reduction, and improve the production efficiency.

[0056] In addition, those skilled in the art should understand that although there are many problems in the prior art, each embodiment or technical solution of the present application can only be improved in one or several aspects, and it is not necessary to solve all the technical problems listed in the prior art or background art at the same time. Those skilled in the art should understand that the content not mentioned in a claim should not be regarded as a limitation of the claim.

[0057] Although terms such as current calibration value, electric angle calibration value, dry contact signal, electric starting mode, current soft starting mode, etc. are used more in this paper, the possibility of using other terms is not excluded. The use of these terms is only to facilitate the description and explanation of the essence of the present application; any additional limitation is contrary to the spirit of the present application; the terms "first", "second", etc. (if exist) in the specification and claims of the embodiment of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not have to describe a specific order or sequence.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for preventing stall control of a permanent magnet motor for a feeding system, characterized in that, The permanent magnet motor is used for providing power for feed conveying in a feeding system, and the method comprises the following steps: In step S10, the slopes of the current and the time and the electrical angle and the time within a preset time after completing the pre-calibration of the motor magnetic pole pairs in the rated state are respectively recorded as the current calibration value and the electrical angle calibration value; In step S20, the current soft start mode of the motor is started, and if it is detected that the slope of the current and the time exceeds X times of the current calibration value and the slope of the electrical angle and the time is lower than Y1 of the electrical angle calibration value within a set time, it is determined that the feed conveying is stalled, and the motor is driven to stop running; wherein the value range of X is 1.3-1.6, and the value range of Y1 is 40%-60%; In step S30, the current of the motor is read in real time during the normal operation of the motor, and if it is determined that the current increases to 1.2 times of the rated current, the motor sends a dry contact signal to close the feeding port of the feeding system; after the feeding port of the feeding system is closed, if it is detected that the current of the motor decreases to 0.8 times of the rated current, the dry contact signal is sent again to open the feeding port of the feeding system, and the motor is normally operated; if it is detected that the current of the motor continues to increase to 1.5 times of the rated current, the motor is driven to stop running, and the motor is restarted, and the step S20 is repeated.

2. The permanent magnet motor anti-blocking control method for a feeding system according to claim 1, characterized in that: In step 20, after it is determined that the feed conveying is stalled and the motor is driven to stop running, the motor sends a dry contact signal to close the feeding port, and the motor is driven to enter a plurality of times of the jog start mode to shake the feed in the feeding system; Then, the current soft start mode of the motor is started, and it is determined whether the torque of the motor exceeds 1.2 times of the rated torque of the motor; if yes, it is determined that the feed conveying is seriously stalled, the motor is driven to stop running, and an alarm signal is sent for manual troubleshooting; If no, it is determined that the feed conveying is normal, and the motor is normally operated.

3. The permanent magnet motor anti-stall control method for feeding systems of claim 1, wherein, In step S20, it further comprises: if it is detected that the slope of the current and the time exceeds X times of the current calibration value and the slope of the electrical angle and the time is lower than Y2 of the electrical angle calibration value within a set time, it is determined that the feed conveying is seriously stalled, the motor is driven to stop running, and an alarm signal is sent for manual troubleshooting; wherein the value range of Y2 is 15%-35%.

4. The permanent magnet motor anti-blocking control method for a feeding system according to claim 1, characterized in that: The preset time is set in the range of 5S-10S.

5. The permanent magnet motor anti-stall control method for feeding systems of claim 1, wherein: The set time is set in the range of 1S-2S.

6. The permanent magnet motor anti-stall control method for feeding systems of claim 2, wherein: In step S20, the motor is driven to enter a plurality of times of the jog start mode, comprising the following steps: The motor starts with a current of 1.2 times of the rated current, and the torque is maintained for several seconds, and then the motor is stopped, and the above process is repeated for several times.

7. The permanent magnet motor anti-stall control method for feeding systems of claim 1, wherein: In step S10, the preset time is 5S, and in step S20, the set time is 1S.

8. The permanent magnet motor anti-stall control method for feeding systems of claim 3, wherein: In step S20, the current soft start mode of the motor is started, and if it is detected that the slope of the current and the time exceeds 1.5 times of the current calibration value and the slope of the electrical angle and the time is lower than 50% of the electrical angle calibration value within a set time, it is determined that the feed conveying is stalled; if it is detected that the slope of the current and the time exceeds 1.5 times of the current calibration value and the slope of the electrical angle and the time is lower than 20% of the electrical angle calibration value, it is determined that the feed conveying is seriously stalled.

9. A feeding system characterized by: The application relates to a feed system, comprising a feed system body and a feed conveying power supply permanent magnet motor in the feed system, and a method for preventing the permanent magnet motor from being blocked in the feed system according to any one of claims 1-8.

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