CN110907822B - Alternating current motor locked rotor fault detection system and method and information data processing terminal - Google Patents
Alternating current motor locked rotor fault detection system and method and information data processing terminal Download PDFInfo
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- CN110907822B CN110907822B CN201911054838.8A CN201911054838A CN110907822B CN 110907822 B CN110907822 B CN 110907822B CN 201911054838 A CN201911054838 A CN 201911054838A CN 110907822 B CN110907822 B CN 110907822B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
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Abstract
The invention belongs to the technical field of motor fault detection, and discloses a system and a method for detecting a locked rotor fault of an alternating current motor and an information data processing terminal, wherein when the motor is started, the upper limit value of zero-crossing chopping is adjusted to be a maximum value X; after the motor is started, the chopping value gradually rises, when the rotation speed is still K rpm/min when the rotation speed rises to the upper limit value, the motor is possibly locked, the chopping is directly adjusted to the maximum value and continuously output for T1 seconds, and an object locked by rotation is removed through inertia; after the rotating speed is continuously output for T2 seconds and still cannot reach the target value, judging that the motor is locked; after entering the protection, the electric appliance closes all the loads; meanwhile, the protection can be recovered only by shutting down and then restarting or can be recovered after power failure and power up. The invention can quickly and effectively detect the motor stalling and avoid the consequence of motor burnout. The electric appliance using the alternating current motor provides a reliable detection means, and the safety coefficient of the system is improved by the means.
Description
Technical Field
The invention belongs to the technical field of motor fault detection, and particularly relates to a system and a method for detecting a locked rotor fault of an alternating current motor and an information data processing terminal.
Background
Currently, the closest prior art: an "ac motor" is a machine for converting mechanical energy and ac electrical energy into each other. Due to the tremendous development of ac power systems, ac motors have become the most commonly used motors. Compared with the direct current motor, the alternating current motor has the advantages of simple structure, convenient manufacture, firmness and easy manufacture into a motor with high rotating speed, high voltage, large current and large capacity because of no commutator (see the commutation of the direct current motor). The coverage of ac power is large, ranging from a few watts to hundreds of thousands of kilowatts, and even millions of kilowatts. In the early 80 s of the 20 th century, the largest turbonators reached 150 ten thousand kilowatts.
Alternating current motors are widely used as power sources of electric appliances. In the use process, the motor can be locked due to various factors, and if the energy is continuously output to the motor at the moment, serious consequences such as motor burnout and fire disaster are caused. The motor locked rotor can be detected in time, and locked rotor protection is very necessary.
In summary, the problems of the prior art are as follows: the AC motor is blocked in the use process, which causes serious consequences such as motor burnout and fire hazard.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a system and a method for detecting the locked rotor fault of an alternating current motor and an information data processing terminal.
The invention is realized in such a way that an alternating current motor locked rotor fault detection method comprises the following steps:
firstly, when a motor is started, adjusting an upper limit value of zero-crossing chopping to a maximum value X; after the chopping X is operated for T1 seconds, if the rotating speed of the motor is still K rpm/min; the inner fan stops running for T2 seconds; after T2 seconds, the motor is started at full speed for T1 seconds, the rotating speed of the motor is still Krpm/min, the motor is considered to be locked, and locked-rotor protection is carried out;
secondly, after the motor is started, the chopping value gradually rises, when the rotation speed is still K rpm/min when the rotation speed rises to the upper limit value, the motor is possibly locked, the chopping is directly adjusted to the maximum value and continuously output for T1 seconds, and an object locked by rotation is removed through inertia; after the rotating speed is continuously output for T2 seconds and still cannot reach the target value, judging that the motor is locked;
thirdly, turning off all loads of the electric appliance after the protection; meanwhile, the protection can be recovered only by shutting down and then restarting or can be recovered after power failure and power up.
Further, the chopped wave output and feedback pulse of the method for detecting the locked rotor fault of the alternating current motor are as follows: the smaller the chopping value is, the larger the output energy is, and corresponding pulses are fed back by the motor every time the motor rotates. The rotating speed of the motor can be calculated by the feedback pulse, and if the calculated rotating speed of the motor is not in a normal range, the motor stalling judgment is carried out.
Further, K in the first step takes a value of 0-600.
Another object of the present invention is to provide an ac motor locked-rotor fault detection system for implementing the ac motor locked-rotor fault detection method, the ac motor locked-rotor fault detection system including:
the locked rotor protection judging module is used for judging whether the motor enters locked rotor protection or not when the motor is started;
the locked rotor object removing module is used for directly adjusting the chopping waves to the maximum value and continuously outputting T1 seconds, and the locked rotor object is removed through inertia;
the load protection module is used for turning off all loads of the electric appliance after protection; meanwhile, the protection can be recovered only by shutting down and then restarting or can be recovered after power failure and power up.
Further, the locked rotor protection judgment module comprises:
the zero chopping upper limit value adjusting unit is used for adjusting the zero chopping upper limit value to a maximum value X; after the chopper X runs for T1 seconds, if the rotating speed of the motor is still Krpm/min, the inner fan stops running for T2 seconds;
and the motor locked-rotor confirming unit is used for starting at full speed for T1 seconds after T2 seconds, and if the rotating speed of the motor is still Krpm/min, the motor is considered to be locked-rotor.
Further, the locked-rotor object removing module includes:
the motor stopping unit is used for stopping the motor when the rotating speed of the motor is lower;
and the full-speed output unit is used for generating a larger torque at full-speed output to remove a locked rotor object.
If the rotating speed still does not reach the target value after the continuous output of T2 seconds, the motor stalling can be judged.
The invention also aims to provide an information data processing terminal for realizing the alternating current motor locked-rotor fault detection method.
It is another object of the present invention to provide a computer-readable storage medium, which includes instructions that, when executed on a computer, cause the computer to execute the method for detecting an ac motor stall fault.
The invention also aims to provide application of the alternating current motor locked-rotor fault detection method in alternating current motor fault detection.
Another object of the present invention is to provide a miniature ac reduction motor having the ac motor mounted thereon.
In summary, the advantages and positive effects of the invention are: comparing the feedback pulse of the motor with the input chopped wave to judge the state of the motor; the motor stalling is judged in a more reliable mode: firstly, outputting the maximum chopping value to a motor; stopping the motor; starting at full speed and calculating feedback pulse; and fourthly, stall protection.
The invention can quickly and effectively detect the motor stalling and avoid the consequence of motor burnout. An electric appliance using the alternating current motor provides a reliable detection means, and the safety coefficient of the system is improved by the means.
Drawings
Fig. 1 is a schematic structural diagram of an ac motor locked-rotor fault detection system according to an embodiment of the present invention;
in the figure: 1. a locked rotor protection judging module; 2. a locked-rotor object removing module; 3. and a load protection module.
Fig. 2 is a flowchart of a method for detecting a locked-rotor fault of an ac motor according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a system for detecting a locked-rotor fault of an ac motor according to an embodiment of the present invention.
Fig. 4 is a flowchart of an implementation of a method for detecting a locked-rotor fault of an ac motor according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In view of the problems in the prior art, the present invention provides a system and a method for detecting a stalling fault of an ac motor, and an information data processing terminal, and the present invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 1, an ac motor locked-rotor fault detection system according to an embodiment of the present invention includes:
and the locked rotor protection judging module 1 is used for judging whether the motor enters locked rotor protection or not when the motor is started.
And the locked-rotor object removing module 2 is used for directly adjusting the chopping to the maximum value and continuously outputting T1 seconds, and removing the locked-rotor object through inertia.
The load protection module 3 is used for turning off all loads of the electric appliance after protection; meanwhile, the protection can be recovered only by shutting down and then restarting or can be recovered after power failure and power up.
The locked rotor protection judgment module 1 includes:
the zero chopping upper limit value adjusting unit is used for adjusting the zero chopping upper limit value to a maximum value X; and after the operation is carried out for T1 seconds by chopping X, if the rotating speed of the motor is still Krpm/min, the operation of the inner fan is stopped for T2 seconds.
And the motor locked-rotor confirming unit is used for starting at full speed for T1 seconds after T2 seconds, and if the rotating speed of the motor is still Krpm/min, the motor is considered to be locked-rotor.
The locked-rotor object removal module 2 includes:
the motor stopping unit is used for stopping the motor when the rotating speed of the motor is lower;
and the full-speed output unit is used for generating a larger torque at full-speed output to remove a locked rotor object.
If the rotating speed still does not reach the target value after the continuous output of T2 seconds, the motor stalling can be judged.
As shown in fig. 2, the method for detecting a locked-rotor fault of an ac motor according to an embodiment of the present invention includes the following steps:
s201: when the motor is started, adjusting the zero-crossing chopping upper limit value to a maximum value X; after the chopper X runs for T1 seconds, if the rotating speed of the motor is still Krpm/min; the inner fan stops running for T2 seconds; after T2 seconds, the motor is started at full speed for T1 seconds, the rotating speed of the motor is still Krpm/min, the motor is considered to be locked, and locked-rotor protection is carried out;
s202: after the motor is started, the chopping value gradually rises, when the rotating speed is still Krpm/min when the rotating speed rises to the upper limit value, the motor is possibly locked, the chopping is directly adjusted to the maximum value and continuously output for T1 seconds, and the locked objects are removed through inertia; after the rotating speed is continuously output for T2 seconds and still cannot reach the target value, judging that the motor is locked;
s203: after entering the protection, the electric appliance closes all the loads; meanwhile, the protection can be recovered only by shutting down and then restarting or can be recovered after power failure and power up.
The technical solution of the present invention is further described below with reference to the accompanying drawings.
As shown in fig. 3 and 4, the chopped wave output and the feedback pulse of the method for detecting the locked rotor fault of the ac motor according to the embodiment of the present invention are: the smaller the chopping value is, the larger the output energy is, and corresponding pulses are fed back by the motor every time the motor rotates. The motor rotating speed can be calculated by the feedback pulse, if the calculated motor rotating speed is not in the normal range, the motor stalling judgment is carried out, and the judgment process is as follows:
1. when the motor is started, firstly, if the chopping wave reaches the upper limit value of the normal chopping wave, if the rotating speed of the motor is Krpm/min, secondly, adjusting the upper limit value of the zero-crossing chopping wave to a maximum value X; and after the chopping X runs for T1 seconds, if the rotating speed of the motor is still Krpm/min, the inner fan stops running for T2 seconds. Fourthly, after T2 seconds, the motor is started at full speed for T1 seconds (full voltage is directly supplied without chopping), if the rotating speed of the motor is still K rpm/min, the motor is considered to be locked, and fifthly, locked-rotor protection is carried out. Note: k value range: 0 to 600.
2. After the motor is started, the chopping value gradually rises, when the rotating speed is still Krpm/min when the rotating speed rises to the upper limit value, the motor is possibly locked, at the moment, chopping is directly adjusted to the maximum value and continuously output for T1 seconds, and the locked objects can be removed through inertia. If the rotating speed is still low, the motor is stopped, and full-speed output is performed again, so that a larger torque can be generated, and a rotation blockage object can be removed to the maximum extent. If the rotating speed still does not reach the target value after the continuous output of T2 seconds, the motor stalling can be judged.
3. After the protection is carried out, all loads of the electric appliance are closed, so that serious consequences are avoided. Meanwhile, the protection can be recovered only by shutting down and then restarting or can be recovered after power failure and power up.
It should be noted that the embodiments of the present invention can be realized by hardware, software, or a combination of software and hardware. The hardware portion may be implemented using dedicated logic; the software portions may be stored in a memory and executed by a suitable instruction execution system, such as a microprocessor or specially designed hardware. Those skilled in the art will appreciate that the apparatus and methods described above may be implemented using computer executable instructions and/or embodied in processor control code, such code being provided on a carrier medium such as a disk, CD-or DVD-ROM, programmable memory such as read only memory (firmware), or a data carrier such as an optical or electronic signal carrier, for example. The apparatus and its modules of the present invention may be implemented by hardware circuits such as very large scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, or programmable hardware devices such as field programmable gate arrays, programmable logic devices, etc., or by software executed by various types of processors, or by a combination of hardware circuits and software, e.g., firmware.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. The method for detecting the locked rotor fault of the alternating current motor is characterized by comprising the following steps of:
firstly, when a motor is started, adjusting an upper limit value of zero-crossing chopping to a maximum value X; after the chopping X is operated for T1 seconds, if the rotating speed of the motor is still K rpm/min; the inner fan stops running for T2 seconds; after T2 seconds, the motor is started at full speed for T1 seconds, the rotating speed of the motor is still K rpm/min, the motor is considered to be locked, and locked-rotor protection is carried out;
secondly, after the motor is started, the chopping value gradually rises, when the rotation speed is still K rpm/min when the rotation speed rises to the upper limit value, the motor is possibly locked, the chopping is directly adjusted to the maximum value and continuously output for T1 seconds, and an object locked by rotation is removed through inertia; after the rotating speed is continuously output for T2 seconds and still cannot reach the target value, judging that the motor is locked;
thirdly, turning off all loads of the electric appliance after the protection; meanwhile, the protection can be recovered only by shutting down and then restarting or can be recovered after power failure and power up;
the chopped wave output and feedback pulse of the alternating current motor locked rotor fault detection method are as follows: the smaller the chopping value is, the larger the output energy is, and corresponding pulses can be fed back by the motor every time the motor rotates; the rotating speed of the motor can be calculated by the feedback pulse, and if the calculated rotating speed of the motor is not in a normal range, the motor stalling judgment is carried out;
and K in the first step takes a value of 0-600.
2. An ac motor locked-rotor fault detection system for implementing the ac motor locked-rotor fault detection method according to claim 1, wherein the ac motor locked-rotor fault detection system comprises:
the locked rotor protection judging module is used for judging whether the motor enters locked rotor protection or not when the motor is started;
the locked rotor object removing module is used for directly adjusting the chopping waves to the maximum value and continuously outputting T1 seconds, and the locked rotor object is removed through inertia;
the load protection module is used for turning off all loads of the electric appliance after protection; meanwhile, the protection can be recovered only by shutting down and then restarting or can be recovered after power failure and power up.
3. The system of claim 2, wherein the locked-rotor protection determination module comprises:
the zero chopping upper limit value adjusting unit is used for adjusting the zero chopping upper limit value to a maximum value X; after the chopping X is operated for T1 seconds, if the rotating speed of the motor is still K rpm/min, the inner fan stops operating for T2 seconds;
and the motor locked-rotor confirming unit is used for starting at full speed for T1 seconds after T2 seconds, and if the rotating speed of the motor is still K rpm/min, the motor is considered to be locked-rotor.
4. The ac motor locked-rotor fault detection system of claim 2, wherein the locked-rotor object removal module comprises:
the motor stopping unit is used for stopping the motor when the rotating speed of the motor is lower;
the full-speed output unit is used for outputting at full speed to generate a larger torque and removing a locked rotor object;
if the rotating speed still does not reach the target value after the continuous output of T2 seconds, the motor stalling can be judged.
5. An information data processing terminal for implementing the method for detecting a locked-rotor fault of an alternating-current motor according to claim 1.
6. A computer-readable storage medium comprising instructions that, when executed on a computer, cause the computer to perform the ac motor stall fault detection method of claim 1.
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| CN116807303A (en) * | 2021-11-16 | 2023-09-29 | 苏州威摩尔智能科技有限公司 | Control method of rolling brush |
| CN114487827B (en) * | 2022-02-14 | 2022-11-25 | 爱科赛智能科技(浙江)有限公司 | Motor starting locked-rotor detection method based on current variance |
| CN116577656B (en) * | 2023-07-12 | 2023-09-15 | 深圳盈特创智能科技有限公司 | Low-delay high-speed dryer zero-crossing detection system |
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