CN116316437A - Protection method, protection device and computer readable medium for motor locked rotor - Google Patents

Protection method, protection device and computer readable medium for motor locked rotor Download PDF

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Publication number
CN116316437A
CN116316437A CN202310281758.6A CN202310281758A CN116316437A CN 116316437 A CN116316437 A CN 116316437A CN 202310281758 A CN202310281758 A CN 202310281758A CN 116316437 A CN116316437 A CN 116316437A
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Prior art keywords
locked
motor
temperature
rotor protection
protection time
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CN202310281758.6A
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Inventor
王浩东
张建
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Jiangsu Dongcheng Tools Technology Co Ltd
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Jiangsu Dongcheng Tools Technology Co Ltd
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Priority to CN202310281758.6A priority Critical patent/CN116316437A/en
Publication of CN116316437A publication Critical patent/CN116316437A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/60—Controlling or determining the temperature of the motor or of the drive
    • H02P29/68—Controlling or determining the temperature of the motor or of the drive based on the temperature of a drive component or a semiconductor component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

The invention relates to a protection method, a protection device and a computer readable medium for motor locked rotor, wherein the protection method comprises the steps that a processing module monitors the running state of a motor; when the running state indicates that the motor is in a locked-rotor protection state, monitoring the continuous running time of the motor in the locked-rotor protection state; when the continuous operation time exceeds the locked-rotor protection time, controlling the motor to stop operating; the locked rotor protection time is set according to parameters of the motor. The motor locked-rotor protection method provided by the invention can set proper protection time according to different states of the motor, and accurately perform locked-rotor protection, so that the belt-carried running of the motor is not affected, and the motor can be effectively protected.

Description

Protection method, protection device and computer readable medium for motor locked rotor
[ technical field ]
The present invention relates to the field of electric tools, and more particularly, to a method and apparatus for protecting motor stalling, and a computer readable medium.
[ background Art ]
Most electric tools need load starting capability, and when the electric tools are started, larger torque is output to overcome load resistance, and at the moment, the rotating speed of the motor is very slow, and the current is larger. If the load resistance is very large and exceeds the output torque during starting, starting locked rotor occurs at the moment, the current can be further increased, the temperature of the motor body and the power device of the controller is increased sharply, so that locked rotor protection is generally added to prevent the motor or the power device from being burnt and damaged.
However, if the locked rotor protection setting is loose, i.e. the protection threshold is relatively large, repeated starting locked rotor, i.e. static locked rotor, is caused, and the accumulated impact of current and temperature on the power device causes the original set protection value to be insufficient to play a role in protection, so that the power device is invalid; the protection of the locked rotor caused by sudden heavy load or jamming in normal operation is also needed in time, but if the static locked rotor protection parameters are still used, the response is not in time, and the protection function cannot be achieved.
If the locked rotor protection setting is strict, namely the protection threshold value is smaller, the power device can be effectively protected in time, but the load starting capability of the tool can be affected.
In view of this, it is necessary to design a protection scheme for motor locked rotor, and to select appropriate locked rotor protection values according to different states of the motor, so that normal on-load starting capability is not affected, and the effectiveness of locked rotor protection in a starting stage and an operating stage is not affected, and the defects in the prior art are overcome.
[ summary of the invention ]
Aiming at the defects of the prior art, the invention aims to provide an improved scheme for accurately performing locked rotor protection and selecting proper locked rotor protection time.
The invention solves the problems in the prior art by adopting the following technical scheme: a protection method for motor stalling, the protection method comprising:
the processing module monitors the running state of the motor;
when the running state indicates that the motor is in a locked-rotor protection state, monitoring the continuous running time of the motor in the locked-rotor protection state;
when the continuous operation time exceeds the locked-rotor protection time, controlling the motor to stop operating;
the locked rotor protection time is set according to parameters of the motor.
Preferably, the processing module controls operation of the motor via a drive module, and the parameter includes a temperature of the drive module.
Preferably, the setting of the locked rotor protection time according to the parameter of the motor specifically includes: when the temperature is higher than a first temperature threshold, the locked rotor protection time is a first locked rotor protection time; when the temperature is lower than a second temperature threshold value, the locked rotor protection time is a second locked rotor protection time; when the temperature is between the first temperature threshold and the second temperature threshold, the locked-rotor protection time decreases with increasing temperature; the first temperature threshold is greater than the second temperature threshold, and the first locked rotor protection time is less than the second locked rotor protection time.
Preferably, the setting of the locked rotor protection time according to the parameter of the motor specifically includes: setting at least one temperature interval, and establishing a corresponding relation between the at least one temperature interval and the locked rotor protection time; and determining a first temperature interval according to the temperature, and determining corresponding locked-rotor protection time according to the first temperature interval.
Preferably, the parameter includes the number of times that a stall has occurred; when the number of times of the occurrence of the locked rotor is smaller than or equal to a number threshold value, setting constant locked rotor protection time; when the number of times of occurrence of the locked rotor is larger than the number threshold, the locked rotor protection time is reduced along with the increase of the number of times of occurrence of the locked rotor.
The invention also provides a protection device for motor locked rotor, which comprises: a control unit for detecting a state of the motor and controlling an operation of the motor; the driving unit is used for controlling the start and stop of the motor; the temperature sensing unit is used for acquiring the temperature of the driving unit;
the control unit is also used for monitoring the running state of the motor; when the running state indicates that the motor is in a locked-rotor protection state, monitoring the continuous running time of the motor in the locked-rotor protection state; when the continuous operation time exceeds the locked-rotor protection time, controlling the motor to stop operating; the locked rotor protection time is set according to parameters of the motor.
Preferably, the parameter comprises a temperature of the drive unit.
Preferably, the setting of the locked rotor protection time according to the parameter of the motor specifically includes: when the temperature is higher than a first temperature threshold, the locked rotor protection time is a first locked rotor protection time; when the temperature is lower than a second temperature threshold value, the locked rotor protection time is a second locked rotor protection time; when the temperature is between the first temperature threshold and the second temperature threshold, the locked-rotor protection time decreases with increasing temperature; the first temperature threshold is greater than the second temperature threshold, and the first locked rotor protection time is less than the second locked rotor protection time.
Preferably, the setting of the locked rotor protection time according to the parameter of the motor further specifically includes: setting at least one temperature interval, and establishing a corresponding relation between the at least one temperature interval and the locked rotor protection time; and determining a first temperature interval according to the temperature, and determining corresponding locked-rotor protection time according to the first temperature interval.
Preferably, the parameter includes the number of times the motor has stalled; when the number of times of the occurrence of the locked rotor is smaller than or equal to a number threshold value, setting constant locked rotor protection time; when the number of times of occurrence of the locked rotor is larger than the number threshold, the locked rotor protection time is reduced along with the increase of the number of times of occurrence of the locked rotor.
The invention also provides a motor locked rotor protection device, which comprises a memory and a processor, wherein the memory stores a computer program which can run on the processor, and the processor realizes the protection method when executing the computer program.
The invention also provides a computer readable medium having non-volatile program code executable by a processor, the program code causing the processor to perform the method of protecting.
Compared with the prior art, the invention has the following beneficial effects: according to the motor locked-rotor protection scheme provided by the invention, when locked-rotor conditions occur, the temperature of the motor driving unit can rise, and the electric tool can be damaged after a plurality of locked-rotor faults occur.
[ description of the drawings ]
The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings:
FIG. 1 is a graph showing the relationship between the lock-up time and the temperature according to a preferred embodiment of the present invention;
FIG. 2 is a flow chart of the present invention for setting the lock-up protection time according to the temperature;
FIG. 3 is a graph showing the relationship between the lock-up time and the temperature according to the second preferred embodiment of the present invention;
FIG. 4 is a flow chart of the locked rotor protection time according to the temperature setting in the second preferred embodiment of the present invention;
FIG. 5 is a flow chart of a third preferred embodiment of the present invention for setting a locked-rotor protection time according to temperature;
FIG. 6 is a flowchart of setting the lock protection time according to the number of times of having occurred in a preferred embodiment of the present invention.
Detailed description of the preferred embodiments
The invention will be described in further detail with reference to the drawings and embodiments.
The terminology used in the present invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The motor locked rotor protection method is suitable for intelligent equipment such as electric tools/electric equipment and the like, and the protection scope of the invention can be provided as long as the equipment/tools can adopt the essence of the technical scheme disclosed below.
Most electric tools need to be started with load when being started, larger torque is needed to be output to overcome load resistance, if the load resistance is very large and exceeds the output torque during starting, the working current of the electric tools can be further increased, the temperature of a motor and a power device is increased sharply, and at the moment, locked rotor protection is needed to be added to prevent the motor and the power device from being burnt out; the power tool can be suddenly overloaded or blocked to generate locked rotation when running, and the locked rotation protection is also needed. In the prior art, a fixed protection value is often selected, however, too large selection of the protection value can lead to untimely protection, the power device is burnt due to temperature rise, and too small selection of the protection value can influence the load starting capability of the electric tool. The invention aims to provide an improved scheme, and proper locked rotor protection time is set, so that the capacity of on-load starting is not affected, and the effectiveness of locked rotor protection is not affected.
The invention solves the problems in the prior art by adopting the following technical scheme: a method of protecting against motor stalling, the method comprising:
the processing module monitors the running state of the motor; when the motor is blocked, the working current can be increased, so that the temperature of the motor is increased, and the motor can be further damaged and the performance of the motor is damaged.
When the running state indicates that the motor is in a locked-rotor protection state, monitoring the continuous running time of the motor in the locked-rotor protection state; when the motor is in a locked-rotor protection state for a long time, the motor is in a state of overcoming a load to output a larger torque for a long time, and the motor is extremely easy to damage due to long-time locked-rotor.
When the continuous operation time exceeds the locked-rotor protection time, controlling the motor to stop operating;
and setting the locked rotor protection time according to parameters of the motor.
According to the invention, the parameters of the motor are utilized to set the locked-rotor protection time, so that the proper locked-rotor protection time can be selected according to different locked-rotor conditions, and the normal load starting capability of the electric tool and the validity of the locked-rotor protection are not influenced.
The processing module controls the operation of the motor through the driving module, and further, the driving module comprises a power device, wherein the power device comprises components such as a MOS tube.
Further, the parameter of the motor includes a temperature of the power device.
Further, the processing module detects the temperature of the power device and sets the locked rotor protection time according to the temperature.
In one embodiment, as shown in FIG. 1, when the temperature is above a first temperature threshold T max When the locked rotor protection time is the first locked rotor protection time t min The method comprises the steps of carrying out a first treatment on the surface of the When the temperature is lower than the second temperature threshold T min When the locked rotor protection time is the second locked rotor protection time t max The method comprises the steps of carrying out a first treatment on the surface of the The first temperature threshold T max Greater than the second temperature threshold T min The first locked rotor protection time is smaller than the second locked rotor protection time.
When the temperature is at the first temperature threshold T max And the second temperature threshold T min In the above-mentioned process, the locked rotor protection time decreases with the rise of the temperature, specifically, according to the linear relation formula of the temperature T and the locked rotor protection time T: (T-T) min )/(T max -T min )＝(t-t max )/(t min -t max ) And setting the locked rotor protection time t. In order to ensure the normal operation of the motor, temperature detection is usually required, and the scheme of the invention belongs to the temperature expansion application, and a new detection element is not required to be added, so that the temperature parameter is utilized for a plurality of times on the original tool, and the utilization rate of data is improved; according to the scheme, the temperature is used for setting the locked rotor protection time, the locked rotor protection can be realized without adding extra cost, and the effectiveness of the locked rotor protection is improved.
Further, as shown in fig. 2, the processing module monitors the running state of the motor, and when the running state indicates that the motor is in a locked-rotor protection state, enters a locked-rotor time adjustment inlet, collects the temperature of the power device, and filters the temperature to obtain the temperature parameter. Judging whether the temperature is higher than a first temperature threshold T max If yes, setting a first locked rotor protection time t min The method comprises the steps of carrying out a first treatment on the surface of the Otherwise, judging whether the temperature is lower than a second temperature threshold T min If yes, setting a second locked rotor protection time t max The method comprises the steps of carrying out a first treatment on the surface of the Otherwise, according to the formula (T-T min )/(T max -T min )＝(t-t max )/(t min -t max ) And setting the locked rotor protection time t. And simultaneously monitoring the continuous operation time of the motor in the locked-rotor protection state, and when the continuous operation time exceeds the locked-rotor protection time, closing the output of the power device, and stopping the motor.
In this embodiment, the locked rotor protection time is set according to the temperature of the power device, so that heat generated when the motor is locked rotor is effectively prevented, and the power device is burnt due to overhigh temperature; in addition, different locked rotor protection time is set according to different temperatures of the power device, so that the protection accuracy is improved, and the normal load starting of the motor is not influenced.
In a second embodiment, as shown in FIG. 3, when the temperature is above the first temperature threshold T max-p Setting the locked rotor protection time as a first locked rotor protection time t min-p 。
When the temperature is at the third temperature threshold T min-n To a second temperature threshold T min-p Setting the locked rotor protection time as a second locked rotor protection time t max 。
When the temperature is at a first temperature threshold T max-p And a second temperature threshold T min-p And in the process, the locked rotor protection time is reduced along with the temperature rise, and specifically, according to a first linear relation formula of the temperature T and the locked rotor protection time T: (T-T) min-p )/(T max-p -T min-p )＝(t-t max )/(t min-p -t max ) And setting the locked rotor protection time t.
The first temperature threshold T max-p Greater than the second temperature threshold T min-p The first locked rotor protection time t min-p Is smaller than the second locked rotor protection time t max 。
Further, when the temperature is lower than the fourth temperature threshold T max-n Setting the third locked rotor protection time t min-n 。
When the temperature is at the third temperature threshold T min-n And a second temperature threshold T min-p Setting a second locked-rotor protection time t in between max 。
When the temperature is at the third temperature threshold T max-n And a fourth temperature threshold T min-n In the middle, the locked rotor protection time increases with the temperature rise, specifically, according to a second linear relation formula (T-T max-n )/(T min-n -T max-n )＝(t-t min-n )/(t max -t min-n ) And setting the locked rotor protection time t.
The fourth temperature threshold T max-n Less than the third temperature threshold T min-n The third temperature threshold T min-n Less than the second temperature threshold T min-p The method comprises the steps of carrying out a first treatment on the surface of the The third locked rotor protection time t min-n Is smaller than the second locked rotor protection time t max 。
Further, as shown in fig. 4, the processing module monitors the running state of the motor, and when the running state indicates that the motor is in a locked-rotor protection state, enters a locked-rotor time adjustment inlet, collects the temperature of the power device, and filters the temperature to obtain the temperature parameter. Judging whether the temperature is higher than a first temperature threshold T max-p If yes, setting a first locked rotor protection time t min-p The method comprises the steps of carrying out a first treatment on the surface of the Otherwise, judging whether the temperature is at a first temperature threshold T max-p To a second temperature threshold T min-p If yes, according to a first linear relation formula of the temperature T and the locked rotor protection time T: (T-T) min-p )/(T max-p -T min-p )＝(t-t max )/(t min-p -t max ) Setting the locked rotor protection time t; otherwise, judging whether the temperature is at a third temperature threshold T min-n To a second temperature threshold T min-p If yes, setting a second locked rotor protection time t max The method comprises the steps of carrying out a first treatment on the surface of the Otherwise, judging whether the temperature is at a fourth temperature threshold T max-n And a third temperature threshold T min-n If so, according to the temperature T and the locked rotor protection time TTwo linear relation formula (T-T) max-n )/(T min-n -T max-n )＝(t-t min-n )/(t max -t min-n ) Setting the locked rotor protection time t; otherwise, setting a third locked-rotor protection time t min-n 。
And simultaneously monitoring the continuous operation time of the motor in the locked-rotor protection state, and when the continuous operation time exceeds the locked-rotor protection time, closing the output of the power device, and stopping the motor.
In the embodiment, different locked-rotor protection time is set according to different temperatures of the power device, so that the problem that the power device is burnt due to overhigh temperature caused by locked-rotor of the motor is effectively avoided; in addition, the motor can be used in the electric tool, the electric tool can be matched with a battery pack to provide energy, and the service life of the battery pack can be influenced when the battery pack works at low temperature, so that protection in a low temperature state is increased, different locked-rotor protection time is set according to specific low temperature values, and the battery pack is effectively protected.
In a third embodiment, at least one temperature interval is set, a corresponding relation between the at least one temperature interval and the locked rotor protection time is established, a first temperature interval is determined according to the temperature obtained by monitoring by the processing module, and the corresponding locked rotor protection time is determined according to the first temperature interval.
Dividing the temperature into a plurality of sections, setting corresponding locked rotor protection time in each temperature section, and forming a locked rotor protection time and temperature comparison table, wherein the table is as follows:
Figure BDA0004138281780000091
further, as shown in fig. 5, the processing module monitors the running state of the motor, and when the running state indicates that the motor is in a locked-rotor protection state, enters a locked-rotor time adjustment inlet, collects the temperature of the power device, and filters the temperature to obtain the temperature parameter. And determining and setting the locked rotor protection time according to the locked rotor protection time and the temperature comparison table. And simultaneously monitoring the continuous operation time of the motor in the locked-rotor protection state, and when the continuous operation time exceeds the locked-rotor protection time, closing the output of the power device, and stopping the motor.
In the embodiment, the locked rotor protection time is set according to the temperature interval, so that the problem of burnout caused by temperature rise of a power device due to locked rotor of a motor is effectively prevented, proper protection time is used, normal operation of the motor is not affected, and the service life of the motor is prolonged.
The parameters of the motor also comprise the number of times of locked rotation, and when the number of times of locked rotation is smaller than or equal to a preset number threshold value, constant locked rotation protection time is set; when the number of times of the occurrence of the locked rotor is larger than the preset number of times threshold, the locked rotor protection time is reduced along with the increase of the number of times of the occurrence of the locked rotor.
Further, setting corresponding locked-rotor protection time according to the number of times of locked-rotor, and forming a comparison table of the locked-rotor protection time and the number of times of locked-rotor, as shown in the following table:
Figure BDA0004138281780000092
Figure BDA0004138281780000101
further, as shown in fig. 6, the processing module monitors the running state of the motor, enters a locked-rotor time adjustment inlet when the running state indicates that the motor is in a locked-rotor protection state, and closes the output of the power device when the continuous running time of the motor exceeds the locked-rotor protection time, and records that the number of times of the locked-rotor is increased once. And determining and updating the current locked-rotor protection time according to the locked-rotor protection time and a comparison table of the number of times of locked-rotor.
In this embodiment, the locked rotor protection time is set according to the number of times of locked rotor, so as to prevent the user from damaging the machine by unlimited starting under the condition of locked rotor or dead locking, and the locked rotor protection time is updated every time the locked rotor fault is added, and after the user resets the machine after power-off, the locked rotor protection time is restored to the initial value, thereby prolonging the service lives of the motor and the machine.
The invention also provides a protection device for motor locked rotor, and the scheme described above is realized through the protection device; the protection device includes: a control unit for detecting a state of the motor and controlling an operation of the motor; the driving unit is used for controlling the start and stop of the motor; the temperature sensing unit is used for acquiring the temperature of the driving unit;
the control unit is also used for monitoring the running state of the motor; when the running state indicates that the motor is in a locked-rotor protection state, monitoring the continuous running time of the motor in the locked-rotor protection state; when the continuous operation time exceeds the locked-rotor protection time, controlling the motor to stop operating; the locked rotor protection time is set according to parameters of the motor.
The control unit controls the operation of the motor through a driving unit, and further, the driving unit comprises a power device.
Further, the parameters of the motor include the temperature of the power device, the control unit detects the temperature of the power device, and the locked rotor protection time is set according to the temperature.
In one embodiment, when the temperature is above a first temperature threshold T max When the locked rotor protection time is the first locked rotor protection time t min The method comprises the steps of carrying out a first treatment on the surface of the When the temperature is lower than the second temperature threshold T min When the locked rotor protection time is the second locked rotor protection time t max The method comprises the steps of carrying out a first treatment on the surface of the The first temperature threshold T max Greater than the second temperature threshold T min The first locked rotor protection time is smaller than the second locked rotor protection time.
When the temperature is at the first temperature threshold T max And the second temperature threshold T min In between, the locked rotor is protectedThe temperature is reduced along with the rise of the temperature, and specifically, according to a linear relation formula of the temperature T and the locked rotor protection time T: (T-T) min )/(T max -T min )＝(t-t max )/(t min -t max ) And setting the locked rotor protection time t.
In order to ensure the normal operation of the motor, temperature detection is usually required, and the scheme of the invention belongs to the temperature expansion application, and a new detection element is not required to be added, so that the temperature parameter is utilized for a plurality of times on the original tool, and the utilization rate of data is improved; according to the scheme, the temperature is used for setting the locked rotor protection time, the locked rotor protection can be realized without adding extra cost, and the effectiveness of the locked rotor protection is improved.
And the control unit monitors the running state of the motor, enters a locked-rotor time adjustment inlet when the running state indicates that the motor is in a locked-rotor protection state, and acquires the temperature of the power device and filters the temperature to obtain the temperature parameter. Judging whether the temperature is higher than a first temperature threshold T max If yes, setting a first locked rotor protection time t min The method comprises the steps of carrying out a first treatment on the surface of the Otherwise, judging whether the temperature is lower than a second temperature threshold T min If yes, setting a second locked rotor protection time t max The method comprises the steps of carrying out a first treatment on the surface of the Otherwise, according to the formula (T-T min )/(T max -T min )＝(t-t max )/(t min -t max ) And setting the locked rotor protection time t. And simultaneously monitoring the continuous operation time of the motor in the locked-rotor protection state, and when the continuous operation time exceeds the locked-rotor protection time, closing the output of the power device, and stopping the motor.
In this embodiment, the locked rotor protection time is set according to the temperature of the power device, so that heat generated when the motor is locked rotor is effectively prevented, and the power device is burnt due to overhigh temperature; in addition, different locked rotor protection time is set according to different temperatures of the power device, so that the protection accuracy is improved, and the normal load starting of the motor is not influenced.
In a second embodiment, when the temperature is higher than the first temperatureThreshold T max-p Setting the locked rotor protection time as a first locked rotor protection time t min-p 。
When the temperature is at the third temperature threshold T min-n To a second temperature threshold T min-p Setting the locked rotor protection time as a second locked rotor protection time t max 。
When the temperature is at a first temperature threshold T max-p And a second temperature threshold T min-p And in the process, the locked rotor protection time is reduced along with the temperature rise, and specifically, according to a first linear relation formula of the temperature T and the locked rotor protection time T: (T-T) min-p )/(T max-p -T min-p )＝(t-t max )/(t min-p -t max ) And setting the locked rotor protection time t.
The first temperature threshold T max-p Greater than the second temperature threshold T min-p The first locked rotor protection time t min-p Is smaller than the second locked rotor protection time t max 。
Further, when the temperature is lower than the fourth temperature threshold T max-n Setting the third locked rotor protection time t min-n 。
When the temperature is at the third temperature threshold T min-n And a second temperature threshold T min-p Setting a second locked-rotor protection time t in between max 。
When the temperature is at the third temperature threshold T max-n And a fourth temperature threshold T min-n In the middle, the locked rotor protection time increases with the temperature rise, specifically, according to a second linear relation formula (T-T max-n )/(T min-n -T max-n )＝(t-t min-n )/(t max -t min-n ) And setting the locked rotor protection time t.
The fourth temperature threshold T max-n Less than the third temperature threshold T min-n The third temperature threshold T min-n Less than the second temperature threshold T min-p The method comprises the steps of carrying out a first treatment on the surface of the The third locked rotor protection time t min-n Smaller than the firstTwo-locked-rotor protection time t max 。
And the control unit monitors the running state of the motor, enters a locked-rotor time adjustment inlet when the running state indicates that the motor is in a locked-rotor protection state, and acquires the temperature of the power device and filters the temperature to obtain the temperature parameter. Judging whether the temperature is higher than a first temperature threshold T max-p If yes, setting a first locked rotor protection time t min-p The method comprises the steps of carrying out a first treatment on the surface of the Otherwise, judging whether the temperature is at a first temperature threshold T max-p To a second temperature threshold T min-p If yes, according to a first linear relation formula of the temperature T and the locked rotor protection time T: (T-T) min-p )/(T max-p -T min-p )＝(t-t max )/(t min-p -t max ) Setting the locked rotor protection time t; otherwise, judging whether the temperature is at a third temperature threshold T min-n To a second temperature threshold T min-p If yes, setting a second locked rotor protection time t max The method comprises the steps of carrying out a first treatment on the surface of the Otherwise, judging whether the temperature is at a fourth temperature threshold T max-n And a third temperature threshold T min-n If so, according to a second linear relation formula (T-T max-n )/(T min-n -T max-n )＝(t-t min-n )/(t max -t min-n ) Setting the locked rotor protection time t; otherwise, setting a third locked-rotor protection time t min-n 。
And simultaneously monitoring the continuous operation time of the motor in the locked-rotor protection state, and when the continuous operation time exceeds the locked-rotor protection time, closing the output of the power device, and stopping the motor.
In the embodiment, different locked-rotor protection time is set according to different temperatures of the power device, so that the problem that the power device is burnt due to overhigh temperature caused by locked-rotor of the motor is effectively avoided; in addition, the motor can be used in the electric tool, the electric tool can be matched with a battery pack to provide energy, and the service life of the battery pack can be influenced when the battery pack works at low temperature, so that protection in a low temperature state is increased, different locked-rotor protection time is set according to specific low temperature values, and the battery pack is effectively protected.
In a third embodiment, the control unit sets at least one temperature interval, establishes a corresponding relationship between the at least one temperature interval and the locked rotor protection time, determines a first temperature interval according to the temperature, and determines the corresponding locked rotor protection time according to the first temperature interval.
Dividing the temperature into a plurality of sections, setting corresponding locked rotor protection time in each temperature section, and forming a locked rotor protection time and temperature comparison table, wherein the table is as follows:
Figure BDA0004138281780000131
Figure BDA0004138281780000141
and the control unit monitors the running state of the motor, enters a locked-rotor time adjustment inlet when the running state indicates that the motor is in a locked-rotor protection state, and acquires the temperature of the power device and filters the temperature to obtain the temperature parameter. And determining and setting the locked rotor protection time according to the locked rotor protection time and the temperature comparison table. And simultaneously monitoring the continuous operation time of the motor in the locked-rotor protection state, and when the continuous operation time exceeds the locked-rotor protection time, closing the output of the power device, and stopping the motor.
In the embodiment, the locked rotor protection time is set according to the temperature interval, so that the problem of burnout caused by temperature rise of a power device due to locked rotor of a motor is effectively prevented, proper protection time is used, normal operation of the motor is not affected, and the service life of the motor is prolonged.
The parameters of the motor also comprise the number of times of locked rotation, and when the number of times of locked rotation is smaller than or equal to a preset number threshold value, constant locked rotation protection time is set; when the number of times of occurrence of the locked rotor is larger than the number threshold, the locked rotor protection time is reduced along with the increase of the number of times of occurrence of the locked rotor.
Further, the control unit sets the corresponding locked-rotor protection time according to the number of times of locked-rotor, and forms a comparison table of the locked-rotor protection time and the number of times of locked-rotor, as shown in the following table:
Figure BDA0004138281780000142
further, the control unit monitors the running state of the motor, enters a locked-rotor time adjustment inlet when the running state indicates that the motor is in a locked-rotor protection state, closes the output of the power device when the continuous running time of the motor exceeds the locked-rotor protection time, and records that the number of times of locked-rotor is increased once. And determining and updating the current locked-rotor protection time according to the locked-rotor protection time and a comparison table of the number of times of locked-rotor.
Further, when the protection device can be used in a power tool, the locked-rotor protection time is restored to an initial value after the user resets the power-off of the power tool.
In this embodiment, the locked rotor protection time is set according to the number of times of locked rotor, so that the power tool is prevented from being damaged by the unlimited starting of the user under the condition of locked rotor or jamming, the locked rotor protection time is updated every time the locked rotor fault is increased, and the service lives of the motor and the power tool are prolonged.
The invention also provides a protection device for motor locked rotor, which comprises a memory and a processor, wherein the memory stores a computer program which can run on the processor, and the protection method of the first embodiment is realized when the processor executes the computer program.
The protection device sets the locked rotor protection time according to the temperature of the motor and the number of times of locked rotor occurrence, so that the problem of burnout caused by the temperature rise of the power device due to the locked rotor of the motor is effectively avoided, and meanwhile, the locked rotor protection time is dynamically set according to the different temperatures, so that the power device can be effectively protected, and the load running capacity of the machine is not influenced; in addition, when the machine is blocked or blocked, the machine is prevented from being damaged by unlimited starting of a user, and the service life of the machine is prolonged.
The invention also provides a computer readable medium having non-volatile program code executable by a processor, the program code causing the processor to perform the protection method of embodiment one.
Compared with the prior art, the protection method provided by the invention has the advantages that different locked-rotor protection time is set for different temperatures under the condition that the normal belt running of the electric tool is not affected, and the different locked-rotor protection time is set according to the number of times of locked-rotor occurrence; through setting up suitable locked rotor protection time effectual protection motor, prolonged the life of motor.
It will be appreciated by those skilled in the art that embodiments of the invention may be provided as a method, tool, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (tools), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, but it should be understood by those skilled in the art that the present invention is not limited thereto, and that the present invention is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A method for protecting motor stalling, comprising:
the processing module monitors the running state of the motor;
when the running state indicates that the motor is in a locked-rotor protection state, monitoring the continuous running time of the motor in the locked-rotor protection state;
when the continuous operation time exceeds the locked-rotor protection time, controlling the motor to stop operating;
the locked rotor protection time is set according to parameters of the motor.
2. The method of claim 1, wherein the processing module controls operation of the motor via a drive module, and wherein the parameter comprises a temperature of the drive module.
3. The method for protecting a locked rotor of a motor according to claim 2, wherein the setting of the locked rotor protection time according to parameters of the motor specifically includes: when the temperature is higher than a first temperature threshold, the locked rotor protection time is a first locked rotor protection time; when the temperature is lower than a second temperature threshold value, the locked rotor protection time is a second locked rotor protection time; when the temperature is between the first temperature threshold and the second temperature threshold, the locked-rotor protection time decreases with increasing temperature; the first temperature threshold is greater than the second temperature threshold, and the first locked rotor protection time is less than the second locked rotor protection time.
4. The method for protecting a locked rotor of a motor according to claim 2, wherein the setting of the locked rotor protection time according to parameters of the motor specifically includes: setting at least one temperature interval, and establishing a corresponding relation between the at least one temperature interval and the locked rotor protection time; and determining a first temperature interval according to the temperature, and determining corresponding locked-rotor protection time according to the first temperature interval.
5. The method of protecting against motor stall according to claim 1, wherein said parameter comprises the number of times stall has occurred; when the number of times of the occurrence of the locked rotor is smaller than or equal to a number threshold value, setting constant locked rotor protection time; when the number of times of occurrence of the locked rotor is larger than the number threshold, the locked rotor protection time is reduced along with the increase of the number of times of occurrence of the locked rotor.
6. A protection device for motor stall, the protection device comprising: a control unit for detecting a state of the motor and controlling an operation of the motor; the driving unit is used for controlling the start and stop of the motor; the temperature sensing unit is used for acquiring the temperature of the driving unit;
the control unit is also used for monitoring the running state of the motor; when the running state indicates that the motor is in a locked-rotor protection state, monitoring the continuous running time of the motor in the locked-rotor protection state; when the continuous operation time exceeds the locked-rotor protection time, controlling the motor to stop operating; the locked rotor protection time is set according to parameters of the motor.
7. The motor stall protection device of claim 6, wherein the parameter comprises a temperature of the drive unit;
the locked rotor protection time is set according to parameters of the motor, and specifically comprises the following steps: when the temperature is higher than a first temperature threshold, the locked rotor protection time is a first locked rotor protection time; when the temperature is lower than a second temperature threshold value, the locked rotor protection time is a second locked rotor protection time; when the temperature is between the first temperature threshold and the second temperature threshold, the locked-rotor protection time decreases with increasing temperature; the first temperature threshold is larger than the second temperature threshold, and the first locked rotor protection time is smaller than the second locked rotor protection time;
the locked rotor protection time is set according to parameters of the motor and specifically comprises the following steps: setting at least one temperature interval, and establishing a corresponding relation between the at least one temperature interval and the locked rotor protection time; and determining a first temperature interval according to the temperature, and determining corresponding locked-rotor protection time according to the first temperature interval.
8. The apparatus according to claim 6, wherein the parameter includes the number of times the motor has been locked; when the number of times of the occurrence of the locked rotor is smaller than or equal to a number threshold value, setting constant locked rotor protection time; when the number of times of occurrence of the locked rotor is larger than the number threshold, the locked rotor protection time is reduced along with the increase of the number of times of occurrence of the locked rotor.
9. A protection device for motor locked rotor, comprising a memory and a processor, wherein the memory stores a computer program capable of running on the processor, and the protection device is characterized in that: the processor, when executing the computer program, implements the protection method of any of the preceding claims 1-5.
10. A computer readable medium having non-volatile program code executable by a processor, characterized by: the program code causes the processor to perform the protection method of any one of claims 1-5.
CN202310281758.6A 2023-03-21 2023-03-21 Protection method, protection device and computer readable medium for motor locked rotor Pending CN116316437A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118040611A (en) * 2024-04-15 2024-05-14 江苏东成工具科技有限公司 Motor control method, motor control device, electronic equipment and storage medium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118040611A (en) * 2024-04-15 2024-05-14 江苏东成工具科技有限公司 Motor control method, motor control device, electronic equipment and storage medium
CN118040611B (en) * 2024-04-15 2024-06-21 江苏东成工具科技有限公司 Motor control method, motor control device, electronic equipment and storage medium

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