CN110165971A - A kind of motor rotation blockage guard method and device - Google Patents
A kind of motor rotation blockage guard method and device Download PDFInfo
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- CN110165971A CN110165971A CN201910582494.1A CN201910582494A CN110165971A CN 110165971 A CN110165971 A CN 110165971A CN 201910582494 A CN201910582494 A CN 201910582494A CN 110165971 A CN110165971 A CN 110165971A
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- 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
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- 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
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- Power Engineering (AREA)
- Control Of Electric Motors In General (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The present invention provides a kind of motor rotation blockage guard method and device, by the stator current for obtaining motor in real time, and the revolving speed of motor, when stator current is greater than and is equal to default first current threshold, and revolving speed is when being less than and being equal to default first rotary speed threshold value, start counter to count, and it is counted according to default counting rule, when the counting of counter is greater than default first count threshold, determine that motor enters locked rotor condition, in the case where motor enters locked rotor condition, counting based on counter, controlling motor reduces power, or, based on the temperature value difference between the first transistor and second transistor, controlling motor reduces power.It can be seen that in the present invention, can real-time monitoring motor whether enter locked rotor condition, and when motor enters locked rotor condition, reduce the power of motor in time, avoid three phase isolated grid bipolar junction transistor from burning out because of high temperature, to protect electric machine controller.
Description
Technical field
The present invention relates to mechanotronics field more particularly to a kind of motor rotation blockage guard method and devices.
Background technique
With the rise of new energy and environmental consciousness, electric car it is universal increasingly wider.In drive system of electric automobile
In design, there are this performance indicators of maximum climbing.Electric car is when carrying out maximum grade climbing performance test, it may appear that tire
The case where locking, the motor speed of electric car at this time level off to zero, and stall occurs for motor.In motor, there is a situation where stalls
Under, three phase isolated grid bipolar junction transistor in electric machine controller (Insulated Gate Bipolar Transistor,
IGBT) no longer switching switchs, and causes a certain phase IGBT to be brought rapidly up, to burn out the IGBT, causes the damage of electric machine controller.
Currently, the prior art is usually that three-phase IGBT increases separately sensor, the respective temperature of real-time monitoring three-phase IGBT,
Determine whether motor occurs stall according to maximum temperature value corresponding in three-phase IGBT.However, the sensor measurement institute on IGBT
There is biggish deviation and delays for obtained temperature value, just feedback police after easily causing motor that the stall of long period occurs
Report, can not make salvo in time, electric machine controller is caused to damage.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of motor rotation blockage guard method and device, with solve motor enter it is stifled
The problem of turning that state for time is too long, the IGBT in electric machine controller caused to burn out because of high temperature.
To achieve the above object, the embodiment of the present invention provides the following technical solutions:
First aspect of the embodiment of the present invention discloses a kind of motor rotation blockage guard method, and the motor rotation blockage guard method is suitable
For electric machine controller, comprising:
The stator current of motor and the revolving speed of the motor are obtained in real time；
When the stator current is greater than and is less than equal to default first current threshold and the revolving speed and is equal to default first
When rotary speed threshold value, starting counter is counted, and is counted according to default counting rule；
When the counting of the counter is greater than default first count threshold, determine that the motor enters locked rotor condition；
In the case where the motor enters locked rotor condition, based on the counting of the counter, controlling the motor is reduced
Power, or, controlling the motor reduces power based on the temperature value difference between the first transistor and second transistor；
Wherein, the first transistor is current in the three phase isolated grid bipolar junction transistor in the electric machine controller
The highest transistor of temperature value, the second transistor are in the three phase isolated grid bipolar junction transistor in the electric machine controller
The minimum transistor of current temperature value.
Optionally, in above-mentioned motor rotation blockage guard method, the starting counter is counted, and according to default counting rule
It is counted, comprising:
Start counter to count, by the stator current of the motor obtained in real time and default first current threshold into
Row compares, and the revolving speed of the motor obtained in real time is compared with default first rotary speed threshold value；
When the stator current is greater than and is equal to default first current threshold and the revolving speed is less than and is equal to described
When default first rotary speed threshold value, the counting of the counter increases a digit；
When the stator current is less than and is greater than equal to default second current threshold or the revolving speed and is equal to default second
When rotary speed threshold value, the counting of the counter reduces a digit；
In the case where the counter often increases or decreases a digit, by the current count of the counter with
Default first count threshold is compared；
Wherein, default second current threshold is less than default first current threshold, the default second revolving speed threshold
Value is greater than default first rotary speed threshold value.
Optionally, in above-mentioned motor rotation blockage guard method, further includes:
When the counting of the counter is less than and is equal to default first count threshold, it is full to determine that the motor enters
Power output state.
Optionally, in above-mentioned motor rotation blockage guard method, the counting based on the counter controls the motor
Reduce power, comprising:
Obtain the current count of the counter；
When the current count of the counter is greater than default first count threshold and is less than default second count threshold
When, the power of the motor is reduced according to default first fall power coefficient, wherein default second count threshold is greater than described
Default first count threshold；
When the current count of the counter is greater than and is equal to default second count threshold, by the function of the motor
Rate is reduced to zero.
Optionally, described based between the first transistor and second transistor in above-mentioned motor rotation blockage guard method
Temperature value difference, controlling the motor reduces power, comprising:
Obtain the temperature value of the first transistor and the temperature value of the second transistor；
Calculate the temperature value difference between the first transistor and the second transistor；
When the temperature value difference between the first transistor and the second transistor be greater than default first temperature difference threshold,
And when being less than default second temperature difference threshold, the power of the motor is reduced according to default second fall power coefficient, wherein described pre-
If the second temperature difference threshold is greater than default first temperature difference threshold；
When the temperature value difference between the first transistor and the second transistor is greater than and is equal to described default the
When two temperature difference thresholds, the power of the motor is reduced to zero.
Optionally, in above-mentioned motor rotation blockage guard method, further includes:
In the case where the temperature value of the second transistor is greater than preset first temperature threshold value, the first crystal is obtained
The temperature value of pipe；
When the temperature value of the first transistor is greater than preset second temperature threshold value and is less than default third temperature threshold
When, the power of the motor is reduced according to default third fall power coefficient, wherein the default third temperature threshold is greater than described
Preset second temperature threshold value, the preset second temperature threshold value are greater than the preset first temperature threshold value；
When the temperature value of the first transistor is greater than and is equal to the default third temperature threshold, by the motor
Power is reduced to zero.
Second aspect of the embodiment of the present invention discloses a kind of motor rotation blockage protective device, the motor rotation blockage protective device packet
It includes:
Acquiring unit, for obtaining the stator current of motor and the revolving speed of the motor in real time；
Counting unit, for when the stator current is greater than and is equal to default first current threshold and the revolving speed is less than
And when being equal to default first rotary speed threshold value, starting counter is counted, and is counted according to default counting rule；
First determination unit, for determining the electricity when the counting of the counter is greater than default first count threshold
Machine enters locked rotor condition；
First control unit, in the case where the motor enters locked rotor condition, based on the counting of the counter,
Controlling the motor reduces power, or, controlling the electricity based on the temperature value difference between the first transistor and second transistor
Machine reduces power；Wherein, the first transistor is in the three phase isolated grid bipolar junction transistor in the electric machine controller
The highest transistor of current temperature value, the second transistor are the three phase isolated grid bipolar transistor in the electric machine controller
The minimum transistor of current temperature value in pipe.
Optionally, in above-mentioned motor rotation blockage protective device, the counting unit includes:
First comparison module, for start counter count, by the stator current of the motor obtained in real time with it is described
Default first current threshold is compared, and the revolving speed of the motor obtained in real time and default first rotary speed threshold value are carried out
Compare；
It counts and increases module, for being greater than and being equal to default first current threshold and described when the stator current
When revolving speed is less than and is equal to default first rotary speed threshold value, the counting of the counter increases a digit；
It counts and reduces module, for when the stator current is less than and is equal to default second current threshold or the revolving speed
When being greater than and being equal to default second rotary speed threshold value, the counting of the counter reduces a digit, wherein described default the
Two current thresholds are less than default first current threshold, and default second rotary speed threshold value is greater than the default first revolving speed threshold
Value；
Second comparison module will be described in the case where the counter often increases or decreases a digit
The current count of counter is compared with default first count threshold.
Optionally, in above-mentioned motor rotation blockage protective device, the first control unit includes:
First control module, for obtaining the current count of the counter；When the current count of the counter is greater than
Default first count threshold and when being less than default second count threshold, according to described in the reduction of default first fall power coefficient
The power of motor, wherein default second count threshold is greater than default first count threshold；When working as the counter
When preceding counting is greater than and is equal to default second count threshold, the power of the motor is reduced to zero；
Second control module, for obtaining the temperature value of the first transistor and the temperature value of the second transistor；
Calculate the temperature value difference between the first transistor and the second transistor；When the first transistor and described second
When temperature value difference between transistor is greater than default first temperature difference threshold and is less than default second temperature difference threshold, according to default
Second fall power coefficient reduces the power of the motor, wherein default second temperature difference threshold is greater than default first temperature
Poor threshold value；When the temperature value difference between the first transistor and the second transistor is greater than and is equal to described default second
When temperature difference threshold, the power of the motor is reduced to zero.
Optionally, in above-mentioned motor rotation blockage protective device, further includes:
Second control unit, for the temperature value in the second transistor be greater than preset first temperature threshold value the case where
Under, obtain the temperature value of the first transistor；When the first transistor temperature value be greater than preset second temperature threshold value and
When less than default third temperature threshold, the power of the motor is reduced according to default third fall power coefficient, wherein described default
Third temperature threshold is greater than the preset second temperature threshold value, and the preset second temperature threshold value is greater than the preset first temperature
Threshold value；When the temperature value of the first transistor is greater than and is equal to the default third temperature threshold, by the function of the motor
Rate is reduced to zero.
A kind of motor rotation blockage guard method provided based on aforementioned present invention and device, by the stator for obtaining motor in real time
The revolving speed of electric current and motor, when stator current is greater than and is equal to default first current threshold and revolving speed is less than and is equal to default the
When one rotary speed threshold value, starting counter is counted, and is counted according to default counting rule, is preset when the counting of counter is greater than
When the first count threshold, determine that motor enters locked rotor condition, in the case where motor enters locked rotor condition, based on counter
Number, control motor reduce power, or, based on the temperature value difference between the first transistor and second transistor, control motor drop
Low-power.It can be seen that in the present invention, by obtaining the stator current of motor and the revolving speed of motor in real time, in conjunction with the counting of counter,
Can real-time monitoring motor whether enter locked rotor condition, and when motor enters locked rotor condition, the counting according to counter or the
Temperature value difference between one transistor and second transistor reduces the power of motor in time, avoids three phase isolated grid ambipolar
Transistor is burnt out because of high temperature, to protect electric machine controller.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of flow diagram of motor rotation blockage guard method provided in an embodiment of the present invention；
A kind of Fig. 2 starting counter provided in an embodiment of the present invention is counted and is counted according to default counting rule
Idiographic flow schematic diagram；
Fig. 3 is the flow diagram of another motor rotation blockage guard method provided in an embodiment of the present invention；
Fig. 4 is the detailed process signal that the tally control motor provided in an embodiment of the present invention based on counter reduces power
Figure；
Fig. 5 is the temperature value difference control provided in an embodiment of the present invention based between the first transistor and second transistor
The detailed process of motor reduction power；
Fig. 6 is the flow diagram of another motor rotation blockage guard method provided in an embodiment of the present invention；
Fig. 7 is a kind of structural schematic diagram of motor rotation blockage protective device provided in an embodiment of the present invention；
Fig. 8 is the structural schematic diagram of another motor rotation blockage protective device provided in an embodiment of the present invention；
Fig. 9 is the structural schematic diagram of another motor rotation blockage protective device provided in an embodiment of the present invention；
Figure 10 is the structural schematic diagram of another motor rotation blockage protective device provided in an embodiment of the present invention；
Figure 11 is the structural schematic diagram of another motor rotation blockage protective device provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, being a kind of motor rotation blockage guard method provided in an embodiment of the present invention, include the following steps:
S101: the stator current of motor and the revolving speed of motor are obtained in real time.
Wherein, the operating condition of the stator current of motor and revolving speed and motor itself has correlation, and stator current is full
It is in current state when power output, motor is in high-speed state when full power exports.When motor enters stall
When state, motor can be in low speed state, but big when the stator current of motor is still maintained in power output
Current status.
S102: first turn is preset when stator current is greater than and is less than and is equal to equal to default first current threshold and revolving speed
When fast threshold value, starting counter is counted, and is counted according to default counting rule.
Wherein, the specific size for presetting the first current threshold can be configured according to the actual situation by technical staff, be preset
The specific size of first rotary speed threshold value can also be configured according to the actual situation by technical staff, and the embodiment of the present invention does not limit
It is fixed.
Counter is every preset duration with regard to one digit of counting, and after counter initialization, counter is counted as
Zero.For example, counter every 10ms add 1 or counter every 10ms subtract 10.In embodiments of the present invention, preset duration can
It is configured according to the actual situation by technical staff, the embodiment of the present invention is without limitation.
It should be noted that starting counter counts, and the detailed process such as Fig. 2 counted according to default counting rule
It is shown.
S103: when the counting of counter is greater than default first count threshold, determine that motor enters locked rotor condition.
Wherein, the specific size for presetting the first count threshold can be configured according to the actual situation by technical staff, this hair
Bright embodiment is without limitation.
In the concrete realization, presetting the first current threshold is 1000A, and presetting the first rotary speed threshold value is 1000 turns/min, in advance
If the first count threshold is 15, the current stator current of motor is 1500A, and the current rotating speed of motor is 200 turns/min.It is found that
Current stator current is greater than default first current threshold, and current rotating speed is less than default first rotary speed threshold value, and starting counter counts.
After counter starting, count is incremented every 10ms for counter, in the time that the counting of counter is initially increased to 15 from 0, motor
Stator current is always more than default first current threshold, and revolving speed is also always less than default first rotary speed threshold value.Therefore, work as counter
Counting when increase to 16, determine that motor enters locked rotor condition.
It should be noted that above-mentioned specific implementation process is used only for illustrating.
After motor enters locked rotor condition, when the power of motor changes, so that stator current is less than default second
Current threshold, or when revolving speed being made to be greater than default second rotary speed threshold value, the counting of counter enters the state successively decreased.Work as counter
Counting when being less than default third count threshold, counter is initialized, the counting zero of counter, and determines that motor exits
Locked rotor condition.
It should be noted that default third count threshold is less than default first count threshold, third count threshold is preset
Specific size can be configured according to the actual situation by technical staff, and the embodiment of the present invention is without limitation.
S104: in the case where motor enters locked rotor condition, the counting based on counter, control motor reduces power, or,
Based on the temperature value difference between the first transistor and second transistor, controlling motor reduces power.
Wherein, the first transistor be electric machine controller in three phase isolated grid bipolar junction transistor in current temperature value most
High transistor, second transistor are that the current temperature value in the three phase isolated grid bipolar junction transistor in electric machine controller is minimum
Transistor.
The corresponding temperature value of three phase isolated grid bipolar junction transistor in electric machine controller is obtained in real time, by comparing
Temperature value size between three phase isolated grid bipolar junction transistor determines that the highest transistor of current temperature value is first crystal
Pipe, the minimum transistor of current temperature value are second transistor.
In the case where motor enters locked rotor condition, the current count of counter is greater than default first count threshold.It is counting
When the current count of number devices is greater than default first count threshold, the current power of motor is reduced, so as to exit full power defeated for motor
It does well, the operating current of the three phase isolated grid bipolar transistor in electric machine controller, which can reduce, causes temperature to gradually decrease, and keeps away
Exempt from three phase isolated grid bipolar junction transistor to burn out because of high temperature, to protect electric machine controller.
Counting based on counter, the detailed process that control motor reduces power are as shown in Figure 4.
Current temperature value difference in the case where motor enters locked rotor condition, between the first transistor and second transistor
Greater than default first temperature difference threshold.When current temperature value difference is greater than default first temperature difference threshold, the current function of motor is reduced
Rate, so that motor exits full power output state, the operating current meeting of the three phase isolated grid bipolar transistor in electric machine controller
Reduction causes temperature to gradually decrease, and avoids three phase isolated grid bipolar junction transistor from burning out because of high temperature, to protect motor control
Device.
It should be noted that default first temperature difference threshold can be configured according to the actual situation by technical staff, the present invention
Embodiment is without limitation.
Based on the temperature value difference between the first transistor and second transistor, controlling motor reduces the detailed process of power
As shown in Figure 5.
In embodiments of the present invention, by obtaining the stator current of motor and the revolving speed of motor in real time, when stator current is big
In and be equal to default first current threshold and when revolving speed is less than and is equal to default first rotary speed threshold value, starting counter is counted, and
It is counted according to counting rule is preset, when the counting of counter is greater than default first count threshold, it is stifled to determine that motor enters
Turn state；In the case where motor enters locked rotor condition, the counting based on counter, control motor reduces power, or, based on the
Temperature value difference between one transistor and second transistor, control motor reduce power.It can be seen that in the present invention, by obtaining in real time
Take the stator current of motor and the revolving speed of motor, in conjunction with the counting of counter, can real-time monitoring motor whether enter stall shape
State, and when motor enters locked rotor condition, according to the temperature between the counting or the first transistor and second transistor of counter
Value difference value reduces the power of motor in time, avoids three phase isolated grid bipolar junction transistor from burning out because of high temperature, to protect motor
Controller.
Optionally, Fig. 2 shows the counting of starting counter, and the detailed process counted according to default counting rule,
Include the following steps:
S201: starting counter counts, and the stator current of the motor obtained in real time and default first current threshold are carried out
Compare, the revolving speed of the motor obtained in real time is compared with default first rotary speed threshold value.
Wherein, the stator current of motor and revolving speed are real-time changes, for different stator current and revolving speed, counter
Counting mode would also vary from.
S202: judge whether stator current is greater than and whether is less than and is equal to equal to default first current threshold and revolving speed
Default first rotary speed threshold value.
If so, executing S203, S204 is otherwise executed.
S203: first turn is preset when stator current is greater than and is less than and is equal to equal to default first current threshold and revolving speed
When fast threshold value, the counting of counter increases a digit.
Wherein, after S203, S207 is continued to execute.
In the concrete realization, presetting the first current threshold is 1000A, and presetting the first rotary speed threshold value is 1000 turns/min, electricity
The current stator current of machine is 1500A, and the current rotating speed of motor is 200 turns/min.It is found that current stator current is greater than default the
One current threshold, current rotating speed are less than default first rotary speed threshold value, and count is incremented every 10ms for counter.
It should be noted that above-mentioned specific implementation process is used only for illustrating.
S204: judge whether stator current is less than and whether is greater than and is equal to equal to default second current threshold or revolving speed
Default second rotary speed threshold value.
Wherein, it presets the second current threshold and is less than default first current threshold, preset the second rotary speed threshold value and be greater than default the
One rotary speed threshold value.If so, executing S205, S206 is otherwise executed.
It should be noted that the specific size of default second current threshold can be set according to the actual situation by technical staff
It sets, the specific size of default second rotary speed threshold value can also be configured according to the actual situation by technical staff, the embodiment of the present invention
Without limitation.
S205: second turn is preset when stator current is less than and is greater than and is equal to equal to default second current threshold or revolving speed
When fast threshold value, the counting of counter reduces a digit.
Wherein, after S205, S207 is continued to execute.
In the concrete realization, presetting the second current threshold is 800A, and presetting the second rotary speed threshold value is 1500 turns/min, currently
Counter is counted as 15, and the current stator current of motor is 300A, and current rotating speed is 2000 turns/min.It follows that current
Stator current is less than default second current threshold, and current rotating speed is greater than default second rotary speed threshold value, and the counting of counter is opened from 150
Begin to reduce, subtracts 10 every 10ms.After 150ms, the stator current of motor is always less than default second current threshold, and revolving speed is big always
In default second rotary speed threshold value, then, counter is counted as 0.
It should be noted that above-mentioned specific implementation process is used only for illustrating.
S206: the counting of counter remains unchanged.
Wherein, after S206, S207 is continued to execute.
S207: in the case where counter often increases or decreases a digit, by the current count of counter and in advance
If the first count threshold is compared.
In embodiments of the present invention, it is counted by starting counter, by the stator current of the motor obtained in real time and is preset
First current threshold is compared, and the revolving speed of the motor obtained in real time is compared with default first rotary speed threshold value, works as stator
When electric current is greater than and is less than equal to default first current threshold and revolving speed and is equal to default first rotary speed threshold value, the meter of counter
It counts and increases a digit, preset when stator current is less than and is greater than and is equal to equal to default second current threshold or revolving speed
When the second rotary speed threshold value, the counting of counter reduces a digit, often increases or decreases a digit in counter
In the case where, the current count of counter is compared with default first count threshold.It can be seen that in the present invention, for motor
Stator current and revolving speed, counter take different modes to be counted, can real-time monitoring motor whether enter locked rotor condition.
Motor easily enters locked rotor condition under full power output state, by learning whether motor enters full function in real time
Rate output state can play the role of prevention & protection to motor rotation blockage.
Optionally, Fig. 3 is another motor rotation blockage guard method provided in an embodiment of the present invention, is included the following steps:
S301: the stator current of motor and the revolving speed of motor are obtained in real time.
Wherein, the specific implementation procedure and realization principle of S301 and the specific implementation procedure of above-mentioned S101 shown in fig. 1 and
Realization principle is consistent, and which is not described herein again.
S302: first turn is preset when stator current is greater than and is less than and is equal to equal to default first current threshold and revolving speed
When fast threshold value, starting counter is counted, and is counted according to default counting rule.
Wherein, the specific implementation procedure and realization principle of S302 and the specific implementation procedure of above-mentioned S102 shown in fig. 1 and
Realization principle is consistent, and which is not described herein again.
S303: judge whether the counting of counter is less than and is equal to default first count threshold.
Wherein, if the counting of counter is less than and is equal to default first count threshold, S304 is executed, is otherwise executed
S305。
S304: when the counting of counter is less than and is equal to default first count threshold, it is defeated to determine that motor enters full power
It does well.
S305: when the counting of counter is greater than default first count threshold, determine that motor enters locked rotor condition.
Wherein, the specific implementation procedure and realization principle of S305 and the specific implementation procedure of above-mentioned S103 shown in fig. 1 and
Realization principle is consistent, and which is not described herein again.After S305, S306 is continued to execute.
S306: in the case where motor enters locked rotor condition, the counting based on counter, control motor reduces power, or,
Based on the temperature value difference between the first transistor and second transistor, controlling motor reduces power.
Wherein, the specific implementation procedure and realization principle of S306 and the specific implementation procedure of above-mentioned S104 shown in fig. 1 and
Realization principle is consistent, and which is not described herein again.
In embodiments of the present invention, by obtaining the stator current of motor and the revolving speed of motor in real time, when stator current is big
In and be equal to default first current threshold and when revolving speed is less than and is equal to default first rotary speed threshold value, starting counter is counted, and
It is counted according to counting rule is preset, when the counting of counter is greater than default first count threshold, it is stifled to determine that motor enters
Turn state；In the case where motor enters locked rotor condition, the counting based on counter, control motor reduces power, or, based on the
Temperature value difference between one transistor and second transistor, control motor reduce power.It can be seen that in the present invention, by obtaining in real time
Take the stator current of motor and the revolving speed of motor, in conjunction with the counting of counter, can real-time monitoring motor whether enter stall shape
State, and when motor enters locked rotor condition, according to the temperature between the counting or the first transistor and second transistor of counter
Value difference value reduces the power of motor in time, avoids three phase isolated grid bipolar junction transistor from burning out because of high temperature, to protect motor
Controller.
Fig. 4 shows the counting based on counter, and control motor reduces the detailed process of power, includes the following steps:
S401: the current count of counter is obtained.
S402: when the current count of counter is greater than default first count threshold and is less than default second count threshold,
The power of motor is reduced according to default first fall power coefficient.
Wherein, it presets the second count threshold and is greater than default first count threshold, preset the specific size of the second count threshold
Can be configured according to the actual situation by technical staff, preset the first fall power coefficient specific size can by technical staff according to
Actual conditions are configured, and the embodiment of the present invention is without limitation.
In the concrete realization, presetting the first count threshold is 200, and presetting the second count threshold is 500, presets the first drop function
Rate coefficient is 0.5, and the current count of counter is 300.It follows that the current count of counter is greater than default first counting threshold
Being worth and being less than default second count threshold reduces the output torque of motor, so that electric according to the first fall power coefficient 0.5 is preset
The power of machine is reduced to the half of full power.
It should be noted that above-mentioned specific implementation process is used only for illustrating.
S403: when the current count of counter is greater than and is equal to default second count threshold, the power of motor is reduced
It is zero.
Wherein, the output torque of motor is zero, then the power of motor is zero.In addition, being preset when the counting of counter is greater than
When the second count threshold, the counting of counter is endowed default second count threshold.
In the concrete realization, presetting the second count threshold is 500, and the current count of counter is 550.It follows that meter
The current count of number device is greater than default second count threshold, and the output torque for reducing motor is zero, so that the power of motor becomes
Zero.
In embodiments of the present invention, it by obtaining the current count of counter, is preset when the current count of counter is greater than
First count threshold and when being less than default second count threshold, the power of motor is reduced according to default first fall power coefficient, when
When the current count of counter is greater than and is equal to default second count threshold, the power of motor is reduced to zero.It can be seen that the present invention
In, when determining that motor enters locked rotor condition, according to the counting of counter, the power of motor is reduced in time, avoids three phase isolated
Grid bipolar junction transistor is burnt out because of high temperature, to protect electric machine controller.
Fig. 5 is shown based on the temperature value difference between the first transistor and second transistor, and controlling motor reduces power
Detailed process, include the following steps:
S501: the temperature value of the first transistor and the temperature value of second transistor are obtained.
Wherein, the temperature value of the three phase isolated grid bipolar junction transistor in electric machine controller is obtained, it is exhausted by comparing three-phase
The temperature value size of edge grid bipolar junction transistor, obtains the temperature value of the first transistor and the temperature value of second transistor.
In the concrete realization, the temperature value of the first phase insulated gate bipolar transistor is 45 DEG C, the second phase insulated gate bipolar
The temperature value of transistor npn npn is 55 DEG C, and the temperature value of third phase insulated gate bipolar transistor is 65 DEG C.It follows that the first phase
The temperature value of insulated gate bipolar transistor is minimum, the temperature value highest of third phase insulated gate bipolar transistor.Therefore, third
65 DEG C of the temperature value temperature values as the first transistor of phase insulated gate bipolar transistor, the first phase insulated gate bipolar crystal
45 DEG C of the temperature value temperature values as second transistor of pipe.
It should be noted that above-mentioned specific implementation process is used only for illustrating.
S502: the temperature value difference between the first transistor and second transistor is calculated.
S503: when the temperature value difference between the first transistor and second transistor be greater than default first temperature difference threshold and
When less than default second temperature difference threshold, the power of motor is reduced according to default second fall power coefficient.
Wherein, it presets the second temperature difference threshold and is greater than default first temperature difference threshold.The specific size of default first temperature difference threshold
Can be configured according to the actual situation by technical staff, preset the second temperature difference threshold specific size can also by technical staff according to
Actual conditions are configured, and the specific size of default second fall power coefficient can also be set according to the actual situation by technical staff
It sets, the embodiment of the present invention is without limitation.
In the concrete realization, the current temperature value difference between the first transistor and second transistor is 15 DEG C, presets the
One temperature difference threshold is 10 DEG C, and presetting the second temperature difference threshold is 20 DEG C, and presetting the second fall power coefficient is 0.5.It follows that current
Temperature value difference is greater than default first temperature difference threshold and is less than default second temperature difference threshold, and foundation presets the first fall power coefficient
0.5, the output torque of motor is reduced, so that the power of motor is reduced to the half of full power.
It should be noted that above-mentioned specific implementation process is used only for illustrating.
S504: when the temperature value difference between the first transistor and second transistor is greater than and is equal to default second temperature difference threshold
When value, the power of motor is reduced to zero.
In the concrete realization, the current temperature value difference between the first transistor and second transistor is 25 DEG C, presets the
Two temperature difference thresholds are 20 DEG C.It follows that current temperature value difference is greater than default second temperature difference threshold, the output for reducing motor is turned round
Square is zero, so that the power of motor becomes zero.
It should be noted that above-mentioned specific implementation process is used only for illustrating.
In embodiments of the present invention, it by obtaining the temperature value of the first transistor and the temperature value of second transistor, calculates
Temperature value difference between the first transistor and second transistor, when the temperature value difference between the first transistor and second transistor
When value is greater than default first temperature difference threshold and is less than default second temperature difference threshold, electricity is reduced according to default second fall power coefficient
The power of machine, when the temperature value difference between the first transistor and second transistor is greater than and is equal to default second temperature difference threshold
When, the power of motor is reduced to zero.It can be seen that in the present invention, when determining that motor enters locked rotor condition, according to the first transistor
Temperature value difference between second transistor, in time reduce motor power, avoid three phase isolated grid bipolar junction transistor because
High temperature and burn out, to protect electric machine controller.
Optionally, Fig. 6 shows another motor rotation blockage guard method provided in an embodiment of the present invention, including walks as follows
It is rapid:
S601: the stator current of motor and the revolving speed of motor are obtained in real time.
Wherein, the specific implementation procedure and realization principle of S601 and the specific implementation procedure of above-mentioned S101 shown in fig. 1 and
Realization principle is consistent, and which is not described herein again.
S602: first turn is preset when stator current is greater than and is less than and is equal to equal to default first current threshold and revolving speed
When fast threshold value, starting counter is counted, and is counted according to default counting rule.
Wherein, the specific implementation procedure and realization principle of S602 and the specific implementation procedure of above-mentioned S102 shown in fig. 1 and
Realization principle is consistent, and which is not described herein again.
S603: when the counting of counter is greater than default first count threshold, determine that motor enters locked rotor condition.
Wherein, the specific implementation procedure and realization principle of S603 and the specific implementation procedure of above-mentioned S103 shown in fig. 1 and
Realization principle is consistent, and which is not described herein again.
S604: judge whether the temperature value of second transistor is greater than preset first temperature threshold value.
Wherein, the first temperature threshold can be configured according to the actual situation by technical staff, and the embodiment of the present invention does not limit
It is fixed.
If the temperature value of second transistor is greater than preset first temperature threshold value, S606 is executed, S605 is otherwise executed.
S605: in the case where motor enters locked rotor condition, the counting based on counter, control motor reduces power, or,
Based on the temperature value difference between the first transistor and second transistor, controlling motor reduces power.
Wherein, the specific implementation procedure and realization principle of S605 and the specific implementation procedure of above-mentioned S104 shown in fig. 1 and
Realization principle is consistent, and which is not described herein again.
S606: in the case where the temperature value of second transistor is greater than preset first temperature threshold value, the first transistor is obtained
Temperature value.
S607: when the temperature value of the first transistor is greater than preset second temperature threshold value and is less than default third temperature threshold
When, the power of motor is reduced according to default third fall power coefficient.
Wherein, it presets third temperature threshold and is greater than preset second temperature threshold value, preset second temperature threshold value is greater than default the
One temperature threshold.
It should be noted that the specific size of preset second temperature threshold value can be set according to the actual situation by technical staff
It sets, the specific size of default third temperature threshold can be configured according to the actual situation by technical staff, preset third and dropped power
The specific size of coefficient can be configured according to the actual situation by technical staff, and the embodiment of the present invention is without limitation.
In the concrete realization, preset first temperature threshold value is 50 DEG C, and preset second temperature threshold value is 60 DEG C, presets third temperature
Spending threshold value is 70 DEG C, fall power coefficient 0.5, and the current temperature value of the first transistor is 65 DEG C.It follows that the first transistor
Temperature value be greater than preset second temperature threshold value and be less than default third temperature threshold, according to presetting the first fall power coefficient
0.5, the output torque of motor is reduced, so that the power of motor is reduced to the half of full power.
It should be noted that above-mentioned specific implementation process is used only for illustrating.
S608: when the temperature value of the first transistor is greater than and is equal to default third temperature threshold, the power of motor is dropped
Low is zero.
In the concrete realization, presetting third temperature threshold is 70 DEG C, and the current temperature value of the first transistor is 75 DEG C.Thus
It is found that the current temperature value of the first transistor is greater than default third temperature threshold, the output torque for reducing motor is zero, so that electric
The power of machine becomes zero.
In embodiments of the present invention, by determining that motor enters locked rotor condition, and the temperature value of second transistor is greater than
In the case where preset first temperature threshold value, the temperature value of the first transistor is obtained, is preset when the temperature value of the first transistor is greater than
Second temperature threshold value and when being less than default third temperature threshold, the power of motor is reduced according to default third fall power coefficient, when
When the temperature value of the first transistor is greater than and is equal to default third temperature threshold, the power of motor is reduced to zero.It can be seen that this hair
In bright, when determining that motor enters locked rotor condition, according to the temperature value of the first transistor, the power of motor is reduced in time, is avoided
Three phase isolated grid bipolar junction transistor is burnt out because of high temperature, to protect electric machine controller.
Based on a kind of motor rotation blockage guard method disclosed in the embodiments of the present invention, the embodiment of the present invention is also corresponding to be provided
A kind of motor rotation blockage protective device.As shown in fig. 7, be a kind of motor rotation blockage protective device provided in an embodiment of the present invention, it should
Device includes:
Acquiring unit 100, for obtaining the stator current of motor and the revolving speed of motor in real time.
Counting unit 200, for when stator current is greater than and is less than and is equal to equal to default first current threshold and revolving speed
When default first rotary speed threshold value, starting counter is counted, and is counted according to default counting rule.
First determination unit 300, for determining that motor enters when the counting of counter is greater than default first count threshold
Locked rotor condition.
First control unit 400, in the case where motor enters locked rotor condition, the counting based on counter to be controlled
Motor reduces power, or, control motor reduces power based on the temperature value difference between the first transistor and second transistor,
Wherein, the first transistor is the highest crystal of current temperature value in the three phase isolated grid bipolar junction transistor in electric machine controller
Pipe, second transistor are the minimum crystal of the current temperature value in the three phase isolated grid bipolar junction transistor in electric machine controller
Pipe.
In embodiments of the present invention, by obtaining the stator current of motor and the revolving speed of motor in real time, when stator current is big
In and be equal to default first current threshold and when revolving speed is less than and is equal to default first rotary speed threshold value, starting counter is counted, and
It is counted according to counting rule is preset, when the counting of counter is greater than default first count threshold, it is stifled to determine that motor enters
Turn state；In the case where motor enters locked rotor condition, the counting based on counter, control motor reduces power, or, based on the
Temperature value difference between one transistor and second transistor, control motor reduce power.It can be seen that in the present invention, by obtaining in real time
Take the stator current of motor and the revolving speed of motor, in conjunction with the counting of counter, can real-time monitoring motor whether enter stall shape
State, and when motor enters locked rotor condition, according to the temperature between the counting or the first transistor and second transistor of counter
Value difference value reduces the power of motor in time, avoids three phase isolated grid bipolar junction transistor from burning out because of high temperature, to protect motor
Controller.
Optionally, another motor rotation blockage protective device provided in an embodiment of the present invention is shown in conjunction with Fig. 7, Fig. 8, counted
Unit 200 includes:
First comparison module 201 is counted for starting counter, by the stator current of the motor obtained in real time and default the
One current threshold is compared, and the revolving speed of the motor obtained in real time is compared with default first rotary speed threshold value.
Count and increase module 202, for when stator current be greater than and be equal to default first current threshold and revolving speed be less than and
When equal to default first rotary speed threshold value, the counting of counter increases a digit.
Count and reduce module 203, for when stator current be less than and be equal to default second current threshold or revolving speed be greater than and
When equal to default second rotary speed threshold value, the counting of counter reduces a digit, wherein default second current threshold is less than
Default first current threshold presets the second rotary speed threshold value and is greater than default first rotary speed threshold value.
Second comparison module 204, in the case where counter often increases or decreases a digit, by counter
Current count be compared with default first count threshold.
In embodiments of the present invention, it is counted by starting counter, by the stator current of the motor obtained in real time and is preset
First current threshold is compared, and the revolving speed of the motor obtained in real time is compared with default first rotary speed threshold value, works as stator
When electric current is greater than and is less than equal to default first current threshold and revolving speed and is equal to default first rotary speed threshold value, the meter of counter
It counts and increases a digit, preset when stator current is less than and is greater than and is equal to equal to default second current threshold or revolving speed
When the second rotary speed threshold value, the counting of counter reduces a digit, often increases or decreases a digit in counter
In the case where, the current count of counter is compared with default first count threshold.It can be seen that in the present invention, for motor
Stator current and revolving speed, counter take different modes to be counted, can real-time monitoring motor whether enter locked rotor condition.
Optionally, another motor rotation blockage protective device provided in an embodiment of the present invention, the dress are shown in conjunction with Fig. 7, Fig. 9
It sets further include:
Second determination unit 500 determines electricity when being less than for the counting when counter and being equal to default first count threshold
Machine enters full power output state.
In embodiments of the present invention, by obtaining the stator current of motor and the revolving speed of motor in real time, when stator current is big
In and be equal to default first current threshold and when revolving speed is less than and is equal to default first rotary speed threshold value, starting counter is counted, and
It is counted according to counting rule is preset, when the counting of counter is greater than default first count threshold, it is stifled to determine that motor enters
Turn state；In the case where motor enters locked rotor condition, the counting based on counter, control motor reduces power, or, based on the
Temperature value difference between one transistor and second transistor, control motor reduce power.It can be seen that in the present invention, by obtaining in real time
Take the stator current of motor and the revolving speed of motor, in conjunction with the counting of counter, can real-time monitoring motor whether enter stall shape
State, and when motor enters locked rotor condition, according to the temperature between the counting or the first transistor and second transistor of counter
Value difference value reduces the power of motor in time, avoids three phase isolated grid bipolar junction transistor from burning out because of high temperature, to protect motor
Controller.
Optionally, another motor rotation blockage protective device provided in an embodiment of the present invention is shown in conjunction with Fig. 7, Figure 10, the
One control unit 400 includes:
First control module 401, for obtaining the current count of counter, when the current count of counter is greater than default the
One count threshold and when being less than default second count threshold, the power of motor is reduced according to default first fall power coefficient,
In, it presets the second count threshold and is greater than default first count threshold, when the current count of counter is greater than and is equal to default second
When count threshold, the power of motor is reduced to zero.
Second control module 402 calculates for obtaining the temperature value of the first transistor and the temperature value of second transistor
Temperature value difference between one transistor and second transistor, when the temperature value difference between the first transistor and second transistor
When greater than default first temperature difference threshold and being less than default second temperature difference threshold, motor is reduced according to default second fall power coefficient
Power, wherein default second temperature difference threshold is greater than default first temperature difference threshold, when between the first transistor and second transistor
Temperature value difference when being greater than and being equal to default second temperature difference threshold, the power of motor is reduced to zero.
In embodiments of the present invention, by obtaining the stator current of motor and the revolving speed of motor in real time, when stator current is big
In and be equal to default first current threshold and when revolving speed is less than and is equal to default first rotary speed threshold value, starting counter is counted, and
It is counted according to counting rule is preset, when the counting of counter is greater than and is equal to default first count threshold, determines motor
Into locked rotor condition；In the case where motor enters locked rotor condition, the counting based on counter, control motor reduces power, or,
Based on the temperature value difference between the first transistor and second transistor, controlling motor reduces power.It can be seen that passing through in the present invention
Obtain the stator current of motor and the revolving speed of motor in real time, in conjunction with the counting of counter, can real-time monitoring motor whether enter
Locked rotor condition, and when motor enters locked rotor condition, according between the counting or the first transistor and second transistor of counter
Temperature value difference, in time reduce motor power, avoid three phase isolated grid bipolar junction transistor from burning out because of high temperature, to protect
Protect electric machine controller.
Optionally, another motor rotation blockage protective device provided in an embodiment of the present invention is shown in conjunction with Fig. 7, Figure 11, it should
Device further include:
Second control unit 600, for the temperature value of second transistor be greater than preset first temperature threshold value in the case where,
The temperature value for obtaining the first transistor, when the temperature value of the first transistor is greater than preset second temperature threshold value and is less than default the
When three temperature thresholds, the power of motor is reduced according to default third fall power coefficient, wherein default third temperature threshold is greater than pre-
If second temperature threshold value, preset second temperature threshold value is greater than preset first temperature threshold value, when the temperature value of the first transistor is greater than
And when being equal to default third temperature threshold, the power of motor is reduced to zero.
In embodiments of the present invention, by determining that motor enters locked rotor condition, and the temperature value of second transistor is greater than
In the case where preset first temperature threshold value, the temperature value of the first transistor is obtained, is preset when the temperature value of the first transistor is greater than
Second temperature threshold value and when being less than default third temperature threshold, the power of motor is reduced according to default third fall power coefficient, when
When the temperature value of the first transistor is greater than and is equal to default third temperature threshold, the power of motor is reduced to zero.It can be seen that this hair
In bright, when determining that motor enters locked rotor condition, according to the temperature value of the first transistor, the power of motor is reduced in time, is avoided
Three phase isolated grid bipolar junction transistor is burnt out because of high temperature, to protect electric machine controller.
All the embodiments in this specification are described in a progressive manner, same and similar portion between each embodiment
Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for system or
For system embodiment, since it is substantially similar to the method embodiment, so describing fairly simple, related place is referring to method
The part of embodiment illustrates.System and system embodiment described above is only schematical, wherein the conduct
The unit of separate part description may or may not be physically separated, component shown as a unit can be or
Person may not be physical unit, it can and it is in one place, or may be distributed over multiple network units.It can root
According to actual need that some or all of the modules therein is selected to achieve the purpose of the solution of this embodiment.Ordinary skill
Personnel can understand and implement without creative efforts.
Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure
And algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Profession
Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered
Think beyond the scope of this invention.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of motor rotation blockage guard method, which is characterized in that be suitable for electric machine controller, comprising:
The stator current of motor and the revolving speed of the motor are obtained in real time；
When the stator current is greater than and is less than equal to default first current threshold and the revolving speed and is equal to default first revolving speed
When threshold value, starting counter is counted, and is counted according to default counting rule；
When the counting of the counter is greater than default first count threshold, determine that the motor enters locked rotor condition；
In the case where the motor enters locked rotor condition, based on the counting of the counter, controlling the motor reduces power,
Or, controlling the motor reduces power based on the temperature value difference between the first transistor and second transistor；
Wherein, the first transistor is the Current Temperatures in the three phase isolated grid bipolar junction transistor in the electric machine controller
It is worth highest transistor, the second transistor is working as in the three phase isolated grid bipolar junction transistor in the electric machine controller
The minimum transistor of preceding temperature value.
2. the method according to claim 1, wherein the starting counter counts, and being advised according to default counting
Then counted, comprising:
Start counter to count, the stator current of the motor obtained in real time and default first current threshold are compared
Compared with the revolving speed of the motor obtained in real time is compared with default first rotary speed threshold value；
When the stator current is greater than and is less than equal to default first current threshold and the revolving speed and is equal to described preset
When the first rotary speed threshold value, the counting of the counter increases a digit；
When the stator current is less than and is greater than equal to default second current threshold or the revolving speed and is equal to default second revolving speed
When threshold value, the counting of the counter reduces a digit；
In the case where the counter often increases or decreases a digit, by the current count of the counter with it is described
Default first count threshold is compared；
Wherein, default second current threshold is less than default first current threshold, and default second rotary speed threshold value is big
In default first rotary speed threshold value.
3. the method according to claim 1, wherein further include:
When the counting of the counter is less than and is equal to default first count threshold, determine that the motor enters full power
Output state.
4. the method according to claim 1, wherein the counting based on the counter, controls the electricity
Machine reduces power, comprising:
Obtain the current count of the counter；
When the current count of the counter is greater than default first count threshold and is less than default second count threshold,
The power of the motor is reduced according to default first fall power coefficient, wherein default second count threshold is greater than described pre-
If the first count threshold；
When the current count of the counter is greater than and is equal to default second count threshold, the power of the motor is dropped
Low is zero.
5. the method according to claim 1, wherein described based between the first transistor and second transistor
Temperature value difference, controlling the motor reduces power, comprising:
Obtain the temperature value of the first transistor and the temperature value of the second transistor；
Calculate the temperature value difference between the first transistor and the second transistor；
When the temperature value difference between the first transistor and the second transistor is greater than default first temperature difference threshold and small
When default second temperature difference threshold, the power of the motor is reduced according to default second fall power coefficient, wherein described default the
Two temperature difference thresholds are greater than default first temperature difference threshold；
When the temperature value difference between the first transistor and the second transistor is greater than and is equal to default second temperature
When poor threshold value, the power of the motor is reduced to zero.
6. the method according to claim 1, wherein further include:
In the case where the temperature value of the second transistor is greater than preset first temperature threshold value, the first transistor is obtained
Temperature value；
When the temperature value of the first transistor is greater than preset second temperature threshold value and is less than default third temperature threshold, press
The power of the motor is reduced according to default third fall power coefficient, wherein the default third temperature threshold is greater than described default
Second temperature threshold value, the preset second temperature threshold value are greater than the preset first temperature threshold value；
When the temperature value of the first transistor is greater than and is equal to the default third temperature threshold, by the power of the motor
It is reduced to zero.
7. a kind of motor rotation blockage protective device characterized by comprising
Acquiring unit, for obtaining the stator current of motor and the revolving speed of the motor in real time；
Counting unit, for when the stator current is greater than and is less than and waits equal to default first current threshold and the revolving speed
When default first rotary speed threshold value, starting counter is counted, and is counted according to default counting rule；
First determination unit, for when the counting of the counter is greater than default first count threshold, determine the motor into
Enter locked rotor condition；
First control unit, for based on the counting of the counter, controlling in the case where the motor enters locked rotor condition
The motor reduces power, or, controlling the motor drop based on the temperature value difference between the first transistor and second transistor
Low-power；Wherein, the first transistor is current in the three phase isolated grid bipolar junction transistor in the electric machine controller
The highest transistor of temperature value, the second transistor are in the three phase isolated grid bipolar junction transistor in the electric machine controller
The minimum transistor of current temperature value.
8. device according to claim 7, which is characterized in that the counting unit includes:
First comparison module is counted for starting counter, and the stator current of the motor obtained in real time is preset with described
First current threshold is compared, and the revolving speed of the motor obtained in real time and default first rotary speed threshold value are compared
Compared with；
It counts and increases module, for when the stator current is greater than and is equal to default first current threshold and the revolving speed
When being less than and being equal to default first rotary speed threshold value, the counting of the counter increases a digit；
It counts and reduces module, for when the stator current is less than and is equal to default second current threshold or the revolving speed is greater than
And when being equal to default second rotary speed threshold value, the counting of the counter reduces a digit, wherein default second electricity
It flows threshold value and is less than default first current threshold, default second rotary speed threshold value is greater than default first rotary speed threshold value；
Second comparison module, in the case where the counter often increases or decreases a digit, by the counting
The current count of device is compared with default first count threshold.
9. device according to claim 7, which is characterized in that the first control unit includes:
First control module, for obtaining the current count of the counter；Described in being greater than when the current count of the counter
When presetting the first count threshold and being less than default second count threshold, the motor is reduced according to default first fall power coefficient
Power, wherein default second count threshold is greater than default first count threshold；When the current meter of the counter
When number is greater than and is equal to default second count threshold, the power of the motor is reduced to zero；
Second control module, for obtaining the temperature value of the first transistor and the temperature value of the second transistor；It calculates
Temperature value difference between the first transistor and the second transistor；When the first transistor and second crystal
When temperature value difference between pipe is greater than default first temperature difference threshold and is less than default second temperature difference threshold, according to default second
Fall power coefficient reduces the power of the motor, wherein default second temperature difference threshold is greater than default first temperature difference threshold
Value；When the temperature value difference between the first transistor and the second transistor is greater than and is equal to default second temperature difference
When threshold value, the power of the motor is reduced to zero.
10. device according to claim 7, which is characterized in that further include:
Second control unit, for obtaining in the case where the temperature value of the second transistor is greater than preset first temperature threshold value
Take the temperature value of the first transistor；When the temperature value of the first transistor is greater than preset second temperature threshold value and is less than
When default third temperature threshold, the power of the motor is reduced according to default third fall power coefficient, wherein the default third
Temperature threshold is greater than the preset second temperature threshold value, and the preset second temperature threshold value is greater than the preset first temperature threshold
Value；When the temperature value of the first transistor is greater than and is equal to the default third temperature threshold, by the power of the motor
It is reduced to zero.
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