CN108390617A - motor rotor temperature monitoring method, device, storage medium and computer equipment - Google Patents
motor rotor temperature monitoring method, device, storage medium and computer equipment Download PDFInfo
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- CN108390617A CN108390617A CN201711308028.1A CN201711308028A CN108390617A CN 108390617 A CN108390617 A CN 108390617A CN 201711308028 A CN201711308028 A CN 201711308028A CN 108390617 A CN108390617 A CN 108390617A
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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
- H02P29/66—Controlling or determining the temperature of the rotor
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- Control Of Electric Motors In General (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The present invention relates to a kind of motor rotor temperature monitoring method, device, storage medium and computer equipments, receive motor stator temperature information, corresponding motor rotor temperature is calculated according to motor stator temperature information and preset temperature of rotor simulation model, temperature of rotor simulation model characterizes the correspondence of the parameter of electric machine and motor rotor temperature, and the parameter of electric machine includes motor stator temperature.When motor rotor temperature is greater than or equal to preset temperature threshold, motor is limited so that motor rotor temperature is less than temperature threshold.By the temperature of rotor simulation model for pre-setting the correspondence of characterization motor stator temperature and motor rotor temperature; can motor rotor temperature directly be obtained according to the motor stator temperature information of acquisition; realize the real time monitoring to motor rotor temperature; and ensure that motor rotor temperature is no more than defined limit value to protect motor by being controlled motor; the risk that motor breaks down is reduced, operational reliability and the safety of motor are improved.
Description
Technical field
The present invention relates to Data Detection Technology fields, more particularly to a kind of motor rotor temperature monitoring method, device, deposit
Storage media and computer equipment.
Background technology
Motor refers to a kind of calutron realized electric energy conversion according to the law of electromagnetic induction or transmitted, its main function
It is to be converted into electric energy using mechanical energy, driving torque is generated, as electrical appliance or the power source of various machineries.Motor people just
It is more and more important in often work and life, since motor will produce amount of heat during the work time, ensure that motor avoids temperature
It is excessively high and damage particularly significant.
Traditional electronic automobile drive motor can only be by the temperature of temperature sensor monitors stator winding, and rotor
High speed rotation should not install associated temperature detection device, therefore the temperature of rotor does not monitor and feedback.Temperature of rotor is excessively high to lead
The very risky of the parts damages (or degraded performance) such as rotor magnetic steel is caused, therefore how to realize the monitoring to motor rotor temperature
It is a problem to be solved.
Invention content
Based on this, it is necessary in view of the above-mentioned problems, providing a kind of motor that can be achieved to be detected motor rotor temperature
Temperature monitoring method, apparatus, storage medium and computer equipment.
A kind of motor rotor temperature monitoring method, includes the following steps：
Receive motor stator temperature information；
Corresponding motor is calculated according to the motor stator temperature information and preset temperature of rotor simulation model to turn
Sub- temperature；The correspondence of temperature of rotor simulation model the characterization parameter of electric machine and motor rotor temperature, the parameter of electric machine
Including motor stator temperature；
When the motor rotor temperature is greater than or equal to preset temperature threshold, motor is limited so that motor turns
Sub- temperature is less than the temperature threshold.
A kind of motor rotor temperature monitoring device, including：
Information receiving module, for receiving motor stator temperature information；
Temperature computation module, for being calculated according to the motor stator temperature information and preset temperature of rotor simulation model
Obtain corresponding motor rotor temperature；The temperature of rotor simulation model characterization parameter of electric machine is corresponding with motor rotor temperature to close
System, the parameter of electric machine includes motor stator temperature；
Motor adjustment module is used for when the motor rotor temperature is greater than or equal to preset temperature threshold, to motor
It is limited so that motor rotor temperature is less than the temperature threshold.
A kind of readable storage medium storing program for executing is stored with computer program, is realized when the computer program of storage is executed by processor
The step of above method.
A kind of computer equipment, including memory, processor and storage can be run on a memory and on a processor
The step of computer program, the processor realizes the above method when executing the computer program.
Above-mentioned motor rotor temperature monitoring method, device, storage medium and computer equipment receive motor stator temperature letter
Breath, corresponding motor rotor temperature is calculated according to motor stator temperature information and preset temperature of rotor simulation model, is turned
The correspondence of sub- temperature simulation model the characterization parameter of electric machine and motor rotor temperature, the parameter of electric machine includes motor stator temperature.
When motor rotor temperature is greater than or equal to preset temperature threshold, motor is limited so that motor rotor temperature is less than temperature
Spend threshold value.Temperature of rotor by pre-setting the correspondence of characterization motor stator temperature and motor rotor temperature emulates mould
Type directly can obtain motor rotor temperature according to the motor stator temperature information of acquisition, realize to the real-time of motor rotor temperature
Monitoring, and ensure that motor rotor temperature is no more than defined limit value to protect motor by being controlled motor, it reduces
The risk that motor breaks down, improves operational reliability and the safety of motor.
Description of the drawings
Fig. 1 is the flow chart of motor rotor temperature monitoring method in an embodiment；
Fig. 2 is the flow chart of motor rotor temperature monitoring method in another embodiment；
Fig. 3 is the diagrammatic cross-section of motor space structure in an embodiment；
Fig. 4 is the diagrammatic cross-section of motor space structure in another embodiment；
Fig. 5 is the structure chart of motor heat simulation circuit in an embodiment；
Fig. 6 is the structure chart of motor rotor temperature monitoring device in an embodiment；
Fig. 7 is the structure chart of motor rotor temperature monitoring device in another embodiment.
Specific implementation mode
In one embodiment, a kind of motor rotor temperature monitoring method is suitable for carrying out electronic automobile drive motor
Temperature monitoring.As shown in Figure 1, this approach includes the following steps：
Step S150：Receive motor stator temperature information.
Motor stator temperature information can be received by controller, for use as corresponding electronics rotor temperature is subsequently calculated.Tool
Body, temperature monitoring, the electricity that temperature sensor will collect can be carried out by mounting temperature sensor on the stator winding of motor
Machine stator temperature information is sent to controller.
Step S160：Corresponding electricity is calculated according to motor stator temperature information and preset temperature of rotor simulation model
Machine rotor temperature.
Wherein, the correspondence of temperature of rotor simulation model the characterization parameter of electric machine and motor rotor temperature, parameter of electric machine packet
Motor stator temperature is included, the parameter of other influences motor rotor temperature is may also include, such as the parameter of electric machine may also include motor and turn
At least one of speed, Motor torque and power of motor.Specifically, heat transfer analysis can be carried out according to the space structure of motor
It determines the origin of heat of motor, the parameter of electric machine for influencing motor temperature is then determined according to the origin of heat of motor, analyze motor
The correspondence of parameter and rotor is preserved to obtain temperature of rotor simulation model.It is fixed when collecting actual motor
After sub- temperature information, controller is by motor stator temperature information input temperature of rotor simulation model, so that it may to calculate correspondence
Motor rotor temperature.
Step S170：When motor rotor temperature be greater than or equal to preset temperature threshold when, motor is limited so that
Motor rotor temperature is less than temperature threshold.
The specific value of temperature threshold is not unique, can be determined according to the parameter request and actual working environment of motor.
After determining corresponding motor rotor temperature according to the motor stator temperature of acquisition, whether detection motor rotor temperature is more than or waits
In temperature threshold, if so, carrying out limitation control to motor until the temperature of rotor is less than temperature threshold.It is appreciated that
Motor is limited it is not unique to reduce the concrete mode of motor rotor temperature, in one embodiment, in step S170
Motor is limited so that motor rotor temperature be less than temperature threshold, including：By limiting power of motor, so that electric
Machine rotor temperature is less than temperature threshold.By taking the parameter of electric machine includes power of motor as an example, since temperature of rotor simulation model can characterize
The correspondence of power of motor and motor rotor temperature, when the motor rotor temperature being calculated is more than preset temperature threshold
When, the power of motor can be directly adjusted to the performance number corresponding to temperature threshold, realize and motor is carried out by power of motor
Limitation is easy to operate reliable to reduce motor rotor temperature.It is appreciated that in other embodiments, it can also in step S170
It is by limiting motor rotating speed or Motor torque to reduce motor rotor temperature.
Above-mentioned motor rotor temperature monitoring method, by pre-setting characterization motor stator temperature and motor rotor temperature
The temperature of rotor simulation model of correspondence directly can obtain motor rotor temperature according to the motor stator temperature information of acquisition,
It realizes the real time monitoring to motor rotor temperature, and ensures that motor rotor temperature is no more than regulation by being controlled motor
Limit value to protect motor, reduce the risk that motor breaks down, improve operational reliability and the safety of motor.
In one embodiment, as shown in Fig. 2, before step S160, motor rotor temperature monitoring method may also include step
Rapid S110 to step S140.
Step S110：Motor heat transfer analysis is carried out according to motor space structure, determines motor origin of heat.
Specifically, by the mode of motor heat transfer, approach according to motor space structure axially and radially progress
It decomposes, determines motor origin of heat.In one embodiment, motor space structure includes the motor casing being axially distributed along motor
Body, stator yoke, stator slot tooth, copper wire winding, rotor the air gap, rotor and shaft.Accordingly, motor origin of heat can
It is lost including iron loss, current loss and mechanical friction.As shown in Figure 3 and shown in Fig. 4, motor space structure includes along motor shaft
It is empty to the electric machine casing housing of distribution, stator yoke yoke, stator slot tooth ＆ copper wire windings teeth＆windings, rotor
Gas gap airgap, rotor rotor and shaft axle, motor origin of heat include iron loss Iron loss, current loss
Current loss, mechanical friction loss Friction loss.
Step S120：The parameter of electric machine and the correspondence of motor rotor temperature are established according to motor origin of heat, is obtained just
Walk simulation model.
After determining the origin of heat of motor, is determined according to motor origin of heat and joined with the relevant motor of motor rotor temperature
Number.Accordingly, in the present embodiment, the parameter of electric machine includes motor stator temperature, motor speed, Motor torque and motor work(simultaneously
Rate.Analog simulation is carried out in combination with motor space structure, analyzing various motor origin of heat influences the temperature of rotor, determines each
The motor origin of heat correspondence with motor rotor temperature and motor stator temperature respectively.Meanwhile difference simulated machine rotating speed,
Each motor origin of heat and motor speed, motor are established in the influence of Motor torque and power of motor to each motor origin of heat
The relationship of torque and power of motor.Finally be combined establish motor stator temperature, motor speed, Motor torque and power of motor with
The correspondence of motor rotor temperature obtains preliminary simulation model.
Step S130：Motor heat simulation circuit is established according to motor space structure and motor origin of heat, and according to electricity
Machine heat simulation circuit carries out motor heat simulation, obtains simulation test data.
Specifically, it is illustrated in figure 5 the structure chart of motor heat simulation circuit in an embodiment, is simulated respectively using capacitance
Electric machine casing housing, stator yoke yoke, stator slot tooth teeth and rotor rotor utilize voltage source model stator copper wire
Winding stator windings simulate iron loss Iron loss and mechanical friction loss Friction loss using current source.
Changed by the electrical parameter for changing the output valve of voltage source and current source and detect each capacitance both sides, simulates different motor heats
Influence of the source to motor stator temperature and motor rotor temperature, obtains simulation test data.
Step S140：Preliminary simulation model is checked according to simulation test data, obtains temperature of rotor simulation model.
According to obtained simulation test data to different motor origin of heat determining in analog simulation and motor stator temperature
Degree and the correspondence of motor rotor temperature are tested, and are joined to motor in preliminary simulation model in conjunction with obtained error is examined
Number and the correspondence of motor rotor temperature are corrected, and obtain temperature of rotor simulation model.
In the present embodiment, modeling and model checking are carried out in conjunction with motor Space structure simulation and motor heat simulation circuit,
The accuracy for ensuring temperature of rotor simulation model, to improve the measurement accuracy of motor rotor temperature.
In one embodiment, with continued reference to Fig. 2, after step S160, motor rotor temperature monitoring method further includes step
Rapid S180.
Step S180：When motor rotor temperature is less than temperature threshold, output motor normal operation prompt message.
If motor rotor temperature is less than temperature threshold, illustrate that motor operation is normal, exportable motor normal operation prompt
Information has informed operating personnel.The type of motor normal operation prompt message is not unique, the corresponding prompt message way of output
It would also vary from, specifically, output motor normal operation prompt message can export preset language by controlling loudspeaker
Sound prompt message can also be to export to preset word or picture by display, can also be the warning light of control corresponding color
It lights.In the present embodiment, prompt message is exported when motor operation is normal, so that operating personnel know motor status, is improved
The convenience of motor temperature monitoring.
In one embodiment, a kind of motor rotor temperature monitoring device is suitable for carrying out electronic automobile drive motor
Temperature monitoring.As shown in fig. 6, the device, which includes information receiving module 150, temperature computation module 160 and motor, adjusts mould
Block 170.
Information receiving module 150 is for receiving motor stator temperature information.
Specifically, temperature monitoring can be carried out by mounting temperature sensor on the stator winding of motor, receives temperature sensor
The motor stator temperature information that will be collected.
Temperature computation module 160 according to motor stator temperature information and preset temperature of rotor simulation model for calculating
To corresponding motor rotor temperature.
Wherein, the correspondence of temperature of rotor simulation model the characterization parameter of electric machine and motor rotor temperature, parameter of electric machine packet
Include motor stator temperature.In addition, the parameter of electric machine may also include at least one of motor speed, Motor torque and power of motor.
Specifically, the origin of heat that heat transfer analysis determines motor can be carried out according to the space structure of motor, then according to motor
Origin of heat determines the parameter of electric machine for influencing motor temperature, analyzes the correspondence of the parameter of electric machine and rotor to be turned
Sub- temperature simulation model is preserved.After collecting actual motor stator temperature information, by motor stator temperature information
Input temperature of rotor simulation model, so that it may to calculate corresponding motor rotor temperature.
Motor adjustment module 170 be used for when motor rotor temperature be greater than or equal to preset temperature threshold when, to motor into
Row limits so that motor rotor temperature is less than temperature threshold.
The specific value of temperature threshold is not unique, can be determined according to the parameter request and actual working environment of motor.
After determining corresponding motor rotor temperature according to the motor stator temperature of acquisition, whether detection motor rotor temperature is more than or waits
In temperature threshold, if so, carrying out limitation control to motor until the temperature of rotor is less than temperature threshold.It is appreciated that
Motor is limited it is not unique to reduce the concrete mode of motor rotor temperature, in one embodiment, motor adjust mould
Block 170 is by limiting power of motor, so that motor rotor temperature is less than temperature threshold.Include motor work(with the parameter of electric machine
For rate, since temperature of rotor simulation model can characterize power of motor and the correspondence of motor rotor temperature, when being calculated
Motor rotor temperature be more than preset temperature threshold when, the power of motor can be directly adjusted to the work(corresponding to temperature threshold
Rate value, realization limits motor by power of motor to reduce motor rotor temperature, easy to operate reliable.It is appreciated that
In other embodiments, motor adjustment module 170 can also be to be turned with reducing motor by limiting motor rotating speed or Motor torque
Sub- temperature.
Above-mentioned motor rotor temperature monitoring device, by pre-setting characterization motor stator temperature and motor rotor temperature
The temperature of rotor simulation model of correspondence directly can obtain motor rotor temperature according to the motor stator temperature information of acquisition,
It realizes the real time monitoring to motor rotor temperature, and ensures that motor rotor temperature is no more than regulation by being controlled motor
Limit value to protect motor, reduce the risk that motor breaks down, improve operational reliability and the safety of motor.
In one embodiment, as shown with 7, motor rotor temperature monitoring device further includes calorimetric analysis module 110, model
Establish module 120, simulation testing module 130 and Model Checking module 140.
Calorimetric analysis module 110 is used in temperature computation module 160 according to motor stator temperature information and preset rotor
Temperature simulation model is calculated before corresponding motor rotor temperature, and motor heat transfer point is carried out according to motor space structure
Analysis, determines motor origin of heat.
Specifically, by the mode of motor heat transfer, approach according to motor space structure axially and radially progress
It decomposes, determines motor origin of heat.In one embodiment, motor space structure includes the motor casing being axially distributed along motor
Body, stator yoke, stator slot tooth, copper wire winding, rotor the air gap, rotor and shaft.Accordingly, motor origin of heat can
It is lost including iron loss, current loss and mechanical friction.
Model building module 120 is used to carry out motor heat transfer analysis according to motor space structure, determines motor heat
Source.
Specifically, by the mode of motor heat transfer, approach according to motor space structure axially and radially progress
It decomposes, determines motor origin of heat.In one embodiment, motor space structure includes the motor casing being axially distributed along motor
Body, stator yoke, stator slot tooth, copper wire winding, rotor the air gap, rotor and shaft.Accordingly, motor origin of heat can
It is lost including iron loss, current loss and mechanical friction.After determining the origin of heat of motor, determined according to motor origin of heat
With the relevant parameter of electric machine of motor rotor temperature.Accordingly, in the present embodiment, the parameter of electric machine simultaneously including motor stator temperature,
Motor speed, Motor torque and power of motor.
Simulation testing module 130 is used to establish motor heat simulation electricity according to motor space structure and motor origin of heat
Road, and motor heat simulation is carried out according to motor heat simulation circuit, obtain simulation test data.
Changed by the electrical parameter for changing the output valve of voltage source and current source and detect each capacitance both sides, simulates different electricity
Influence of the machine origin of heat to motor stator temperature and motor rotor temperature, obtains simulation test data.
Model Checking module 140 obtains rotor temperature for being checked to preliminary simulation model according to simulation test data
Spend simulation model.
According to obtained simulation test data to different motor origin of heat determining in analog simulation and motor stator temperature
Degree and the correspondence of motor rotor temperature are tested, and are joined to motor in preliminary simulation model in conjunction with obtained error is examined
Number and the correspondence of motor rotor temperature are corrected, and obtain temperature of rotor simulation model.In the present embodiment, in conjunction with motor sky
Between structural simulation and motor heat simulation circuit carry out modeling and model checking, it is ensured that the accuracy of temperature of rotor simulation model,
To improve the measurement accuracy of motor rotor temperature.
In one embodiment, with continued reference to Fig. 7, motor rotor temperature monitoring device further includes nformation alert module 180.
Nformation alert module 180 is used in temperature computation module 160 according to motor stator temperature information and preset rotor
Temperature simulation model is calculated after corresponding motor rotor temperature, when motor rotor temperature is less than temperature threshold, output
Motor normal operation prompt message.If motor rotor temperature is less than temperature threshold, illustrate that motor operation is normal, exportable motor
Normal operation prompt message has informed operating personnel.The type of motor normal operation prompt message is not unique, corresponding prompt
Message stream mode would also vary from, and specifically, output motor normal operation prompt message can pass through controlling loudspeaker
Preset information of voice prompt is exported, can also be to export to preset word or picture by display, can also be that control corresponds to
The warning light of color is lighted.Prompt message is exported when motor operation is normal, so that operating personnel know motor status, is improved
The convenience of motor temperature monitoring.
In one embodiment, a kind of readable storage medium storing program for executing, is stored with computer program, and the computer program of storage is located
Manage the step of realizing the above method when device executes.
In one embodiment, a kind of computer equipment, including memory, processor and storage are on a memory and can be
The step of computer program run on processor, processor realizes the above method when executing computer program.
Above-mentioned readable storage medium storing program for executing and computer equipment, by pre-setting characterization motor stator temperature and rotor temperature
The temperature of rotor simulation model of the correspondence of degree directly can obtain rotor temperature according to the motor stator temperature information of acquisition
Degree realizes the real time monitoring to motor rotor temperature, and by being controlled motor to ensure that motor rotor temperature is no more than
Defined limit value reduces the risk that motor breaks down, improves operational reliability and the safety of motor to protect motor.
Each technical characteristic of embodiment described above can be combined arbitrarily, to keep description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of motor rotor temperature monitoring method, which is characterized in that include the following steps：
Receive motor stator temperature information；
Corresponding rotor temperature is calculated according to the motor stator temperature information and preset temperature of rotor simulation model
Degree；The correspondence of temperature of rotor simulation model the characterization parameter of electric machine and motor rotor temperature, the parameter of electric machine include
Motor stator temperature；
When the motor rotor temperature is greater than or equal to preset temperature threshold, motor is limited so that rotor temperature
Degree is less than the temperature threshold.
2. motor rotor temperature monitoring method according to claim 1, which is characterized in that described according to the motor stator
Before the step of corresponding motor rotor temperature is calculated in temperature information and preset temperature of rotor simulation model, further include with
Lower step：
Motor heat transfer analysis is carried out according to motor space structure, determines motor origin of heat；
The parameter of electric machine and the correspondence of motor rotor temperature are established according to the motor origin of heat, obtains tentatively emulating mould
Type；
Motor heat simulation circuit is established according to the motor space structure and the motor origin of heat, and according to the motor
Heat simulation circuit carries out motor heat simulation, obtains simulation test data；
The preliminary simulation model is checked according to the simulation test data, obtains the temperature of rotor simulation model.
3. motor rotor temperature monitoring method according to claim 2, which is characterized in that the motor space structure includes
The electric machine casing that is axially distributed along motor, stator yoke, stator slot tooth, copper wire winding, rotor the air gap, rotor and turn
Axis.
4. motor rotor temperature monitoring method according to claim 2, which is characterized in that the motor origin of heat includes
Iron loss, current loss and mechanical friction loss.
5. motor rotor temperature monitoring method according to claim 1, which is characterized in that the parameter of electric machine further includes electricity
At least one of machine rotating speed, Motor torque and power of motor.
6. motor rotor temperature monitoring method according to claim 5, which is characterized in that it is described to motor limited with
Motor rotor temperature is set to be less than the temperature threshold, including：By limiting power of motor, so that motor rotor temperature is small
In the temperature threshold.
7. motor rotor temperature monitoring method according to claim 1, which is characterized in that described according to the motor stator
After the step of corresponding motor rotor temperature is calculated in temperature information and preset temperature of rotor simulation model, further include with
Lower step：
When the motor rotor temperature is less than temperature threshold, output motor normal operation prompt message.
8. a kind of motor rotor temperature monitoring device, which is characterized in that including：
Information receiving module, for receiving motor stator temperature information；
Temperature computation module, for being calculated according to the motor stator temperature information and preset temperature of rotor simulation model
Corresponding motor rotor temperature；The correspondence of temperature of rotor simulation model the characterization parameter of electric machine and motor rotor temperature,
The parameter of electric machine includes motor stator temperature；
Motor adjustment module, for when the motor rotor temperature is greater than or equal to preset temperature threshold, being carried out to motor
It limits so that motor rotor temperature is less than the temperature threshold.
9. a kind of readable storage medium storing program for executing, is stored with computer program, which is characterized in that the computer program of storage is held by processor
It is realized when row such as the step of any one of claim 1-7 the method.
10. a kind of computer equipment, including memory, processor and storage are on a memory and the meter that can run on a processor
Calculation machine program, which is characterized in that the processor is realized when executing the computer program as described in claim any one of 1-7
The step of method.
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| CN201711308028.1A CN108390617B (en) | 2017-12-11 | 2017-12-11 | Motor rotor temperature monitoring method and device, storage medium and computer equipment |
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| CN201711308028.1A CN108390617B (en) | 2017-12-11 | 2017-12-11 | Motor rotor temperature monitoring method and device, storage medium and computer equipment |
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| CN112994585A (en) * | 2021-04-01 | 2021-06-18 | 安徽江淮汽车集团股份有限公司 | Motor control method, motor and readable storage medium |
| CN114779074A (en) * | 2022-04-19 | 2022-07-22 | 安徽皖新电机有限公司 | Automatic test system for rapid delivery load test of motor |
| CN114779074B (en) * | 2022-04-19 | 2022-12-30 | 安徽皖新电机有限公司 | Automatic test system for rapid delivery load test of motor |
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