CN107659066A - A kind of motor module and its control method - Google Patents
A kind of motor module and its control method Download PDFInfo
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- CN107659066A CN107659066A CN201711043398.7A CN201711043398A CN107659066A CN 107659066 A CN107659066 A CN 107659066A CN 201711043398 A CN201711043398 A CN 201711043398A CN 107659066 A CN107659066 A CN 107659066A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/25—Devices for sensing temperature, or actuated thereby
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
- H02K11/35—Devices for recording or transmitting machine parameters, e.g. memory chips or radio transmitters for diagnosis
-
- 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
- H02P29/64—Controlling or determining the temperature of the winding
-
- 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
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The present invention relates to technical field of motors, discloses a kind of motor module and its control method, in the case where not increasing the hardware cost of existing motor, can increase driving current to greatest extent, while and can avoids the permanent magnet of direct current generator from demagnetizing.The present invention includes memory module, detection module and driving current judge module：First prestored at least one demagnetization current curve to memory module, recycle the winding temperature of detection module detection motor, the magnet feature of motor is read after driving current judge module, analyze whether the magnet feature preserves the demagnetization current curve answered, if have, the demagnetization current curve is then taken out from memory module, and the maximum allowable electric current of motor is dynamically adjusted according to winding temperature and the demagnetization current curve, if no, user is reminded to preserve demagnetization current curve corresponding to the magnet feature to memory module.The present invention is applied to DC frequency-changing refrigeration system, DC frequency-changing pump motor or DC fan.
Description
Technical field
The present invention relates to technical field of motors, more particularly to a kind of motor module and its control method.
Background technology
Brushless direct current permanent magnetic variable-speed motor (variable-frequency motor) is typically made up of stator and rotor, and permanent magnet is normally at electricity
Machine rotor, motor stator are typically formed by U, V, W three-phase symmetrical wye connection coiling.Judge rotor-position, stator winding U,
V, W, rotating excitation field motor rotor is formed by electric current with rule in certain sequence and rotated.
Due to no position sensor, direct current generator is possible to step-out occur when operating, and now stator winding current is excessive,
More than rotor permanent magnet demagnetization current, permanent magnet can be caused to demagnetize, permanent magnet demagnetization can decline Electronic Performance, until nothing
Method, which starts, scraps.Therefore it can be controlled under permanent magnet minimum demagnetization current generally for DC motor Driver electric current.
The control method of current motor operating is a lot, and the performance for the control method and system for being directed to variable-frequency motor enters one
The raising of step receives certain limitation, because what is fixed during their safe current.
The content of the invention
The technical problem to be solved in the present invention is：A kind of motor module and its control method are provided, do not increasing existing electricity
In the case of the hardware cost of machine, driving current can be increased to greatest extent, while and can avoids the permanent magnet of direct current generator
Demagnetization.
To solve the above problems, the technical solution adopted by the present invention is：
A kind of motor module, including memory module, detection module and driving current judge module；
Memory module be used for preserve at least one demagnetization current curve, the demagnetization current curve be on winding temperature with
The curve of demagnetization current；
Detection module is used for the winding temperature for detecting motor；
Driving current judge module is used for the magnet feature for reading motor, whether in a storage module to analyze the magnet feature
Demagnetization current curve corresponding to preserving, if so, the demagnetization current curve is then taken out from memory module, and according to winding temperature
And the demagnetization current curve dynamically adjusts the maximum allowable electric current of motor, if not having, user is reminded to be protected to memory module
Deposit demagnetization current curve corresponding to the magnet feature.
Further, above-mentioned motor module also includes determining module, and the determining module is used for one driving time of determination
Length variable, to be no more than a time threshold when ensuring and being operated using the driving current of maximum come motor.
Further, if the motor module should can be used for DC frequency-changing pump motor or DC fan, due to DC frequency-changing
Pump motor or DC fan can convenient mounting temperature sensor, therefore the detection module can be temperature sensor,
Motor module directly detects the winding temperature of motor using temperature sensor；If the motor module is applied to DC frequency-changing refrigeration system
System, due to being limited to the working environment of DC frequency-changeable compressor, it is difficult to mounting temperature sensor, therefore the detection module is one
Individual detection circuit, detection module detect the parameter of direct current generator first, and the parameter of electric machine for being then based on detecting calculates winding temperature
Degree, after DC frequency-changing refrigeration system dynamically adjusts the maximum allowable electric current of motor by motor module, DC frequency-changing compression
The running ability baseline of DC frequency-changeable compressor motor is set dynamically using the maximum allowable electric current after adjustment for machine.
Further, the magnet that the driving current judge module reads motor is characterized as feature coding.
A kind of control method of motor, comprises the following steps：
Prestored at least one demagnetization current curve to memory module, the demagnetization current curve is with moving back on winding temperature
The curve of magnetoelectricity stream；
Detection winding temperature；
The magnet feature of motor is read, analyzes whether the magnet feature prestores demagnetization current curve, if so, then from storage
The demagnetization current curve is taken out in module, and the maximum of motor is dynamically adjusted according to winding temperature and the demagnetization current curve
Electric current allowable；If no, remind user preserve demagnetization current curve corresponding to the magnet feature to memory module, when user to
Memory module is preserved after the magnet feature corresponds to demagnetization current curve, again detection winding temperature, and according to winding temperature and
The magnet feature corresponds to the maximum allowable electric current that demagnetization current curve dynamically adjusts motor.
Further, the control method of above-mentioned motor, the length variable of a driving time is further defined, to ensure to use
Maximum driving current to be no more than a time threshold during motor operating.
Further, detection winding temperature methods are：The winding temperature of motor is directly detected using temperature sensor, or
Person, direct current generator parameter is detected first, the parameter of electric machine for being then based on detecting calculates winding temperature
The beneficial effects of the invention are as follows：The present invention adjusts the maximum allowable electric current of motor by dynamic, existing not increasing
In the case of the hardware cost of motor, the operational effect of motor can be improved to greatest extent, play its maximum operational efficiency,
And it can guarantee that its reliably safe operation.
Brief description of the drawings
Fig. 1 is the flow chart for the method that electromotor winding temperature is detected in embodiment 1；
Fig. 2 is the structured flowchart of the equipment comprising motor in embodiment 1；
Fig. 3 is the flow chart of the control method of DC frequency-changing refrigeration system in embodiment 2.
Embodiment
Embodiment 1
Embodiment 1 aims to provide a kind of method for detecting electromotor winding temperature and the equipment comprising motor, for solving
The certainly poor technical problem of the accuracy of the temperature of motor interior in equipment of the temperature in use sensor detection comprising motor.
In the present embodiment, the equipment comprising motor can be intelligent air condition, such as intelligent frequency-conversion air-conditioning or fixed frequency air conditioner
Deng it can be to the sky of corresponding environment space (office, dining room in parlor, bedroom in such as family, or office building etc.)
Temperature degree is adjusted, and such as adjusts temperature, the humidity of air, and the embodiment of the present invention is not specifically limited to this.
As shown in figure 1, a kind of method for detecting electromotor winding temperature provided in an embodiment of the present invention, applied to including electricity
The equipment of motivation, the process of this method can be described as follows:
S11：It is determined that at least one rate of change in the equipment comprising motor, at least one rate of change includes motor pair
The variation rate of magnetic flux and/or resistance change rate answered.
In the embodiment of the present invention, the equipment comprising motor in the course of the work, is such as freezed or heated, and compressor passes through
Motor drives and is operated.Wherein, motor is can to realize electric energy conversion or the one kind transmitted according to the law of electromagnetic induction
Calutron, its main function is to produce driving torque, as with power source.Optionally, it is electric in the equipment comprising motor
Motivation can be permanent magnet synchronous DC brushless motor or other types motor, and the present invention is not specifically limited to this.
Optionally, in step s 11, determining the method for at least one rate of change can be：It is determined that include motor
The operating magnetic flux parameter of motor and operating resistance parameter in equipment, based on operating magnetic flux parameter and initial magnetic flux amount parameter
Between ratio obtain variation rate of magnetic flux, based on operating resistance parameter and initial resistance parameter between ratio determine resistance become
Rate.
In actual applications, the rotary power of ac motor relies primarily on alternating current and establishes rotary magnetic in the stator
, the stator winding of usual threephase motor is respectively by mutually differing the electric current of 120 ° (electrical angle), you can to obtain rotary magnetic
.The coil (such as copper coil) of the rotor of motor can produce magnetic field after being powered, and interact and rotate with magnetic field stator.
The operating resistance parameter of motor can be obtained by testing in equipment comprising motor, such as can pass through million
The resistance value of Europe table or universal meter measurement motor, or, the resistance parameter of calculating determination motor can also be passed through.
It is for instance possible to use calculated with resistivity formula, i.e. R=ρ (L/S), wherein, R represents the resistance of wire, and unit is
Ohm, ρ represent the resistivity of conductor, and unit is ohmcm, and L represents the length of wire, unit for centimetre, S represents wire
Sectional area, unit is square centimeter.And length (L) of wire is calculated as：The girth * of motor winding is per line of rabbet joint number of turns *
Every group of coil number.
Because resistivity is generally related to temperature, in compressor operation, resistance may be with motor
The change of temperature and change.For thermal resistor, the typical feature of thermal resistor is to temperature
Degree is sensitive, and different resistance values is shown at different temperature.It includes positive temperature coefficient thermistor (PTC) and negative temperature
Coefficient thermal resistor (NTC), wherein, positive temperature coefficient thermistor (PTC) resistance value when temperature is higher is bigger, subzero temperature
It is lower to spend coefficient thermal resistor (NTC) resistance value when temperature is higher.Therefore the operating electricity for obtaining motor can be detected in real time
Hinder parameter.
Optionally, operating magnetic flux can be calculated and determined according to the parameter of correlation.From foregoing teachings, magnetic flux
Amount is directly proportional to magnetic induction density B, and magnetic induction density B is directly proportional to electric current, so, magnetic flux is just directly proportional to electric current,
Therefore in actual applications, the operating magnetic flux parameter of motor can be determined by measuring motor current.It is electronic measuring
Can be determined using single resistance or more resistor current method of samplings or other method of testings, the present invention is right during the electric current of machine
This is not specifically limited.
In actual applications, initial resistance parameter and initial magnetic flux amount parameter can be the marks on the nameplate based on motor
What note determined.For example, B is magnetic flux density (i.e. magnetic induction intensity), unit is tesla (T), should be had on the nameplate of motor
Mark.S is that the pole-face under each pole-face accumulates, S=L τ：Wherein L is effective edge lengths of armature coil, and τ is pole span, the two
Measure, should also be marked on the nameplate of motor, then according to above three parameter, it is possible to try to achieve magnetic flux：Φ=BS.Have
Also numerical value can be directly given on nameplate, if magnetic flux is 0.2047Wb, resistance is 3.3 Ω.
It is determined that after operating magnetic flux parameter and initial magnetic flux amount parameter, it may be determined that ratio between the two, i.e. magnetic
Variations of flux rate.Similarly, according to the operating resistance parameter and initial resistance parameter of determination, you can it is determined that corresponding resistance variations
Rate.As a rule, the parameter when dispatching from the factory of the equipment comprising motor can be set at once, and such as initial resistance parameter can
With in the range of [0.5 Ω, 25 Ω].
When in actual applications, under normal circumstances, such as normal temperature, the ratio of magnetic flux parameter and initial magnetic flux amount parameter is operated
Value, i.e., variation rate of magnetic flux and resistance change rate can be 1, therefore, can using 1 as rate of change benchmark, got over relative to 1 deviation
It is more, then show that change is also big.
S12：Based at least one rate of change, the temperature when operating of the motor is real-time is determined.
In the embodiment of the present invention, because variation rate of magnetic flux corresponding to motor and resistance change rate have with temperature respectively
Corresponding corresponding relation.As a rule, according to the temperature-coefficient of electrical resistance of equipment in motor, it may be determined that caused by temperature change
Resistance and magnetic flux change, so as to establish the corresponding relation.
And the corresponding relation between resistance change rate and temperature is generally related with the attribute of device material.For example, for just
The material of temperature coefficient, when temperature within the specific limits when, resistance value will not change, and when temperature continues to rise and exceedes
After critical value, then resistance will accordingly increase.
In actual applications, because temperature-coefficient of electrical resistance is fixed value, it can be expressed as TCR, i.e.,
TCR=(r-r0)*ΔT/r0(formula 1)
The formula is deformed, then had：
TCR=(r/r0- 1) * Δs T (formula 2)
Wherein, r/r0For resistance change rate, it can be calculated by formula 5 and obtained, and Δ T represents the variable quantity of temperature, and it is
The absolute value of operating temperature and the difference of critical-temperature.TCR values can characterize temperature and raise 1 DEG C, the change of the resistance value of equipment.Example
Such as, for corresponding positive temperature coefficient, temperature raises, then resistance raises, temperature and resistance direct proportionality, and for negative temperature
For, temperature rise resistance then reduces, and temperature and resistance are in inversely prroportional relationship.And then the calculation formula based on above-mentioned TCR can be with
Draw the proportionate relationship between resistance and temperature, you can calculate corresponding operating temperature.
For example, if critical-temperature is 45 DEG C, the temperature coefficient of device for -0.1 (i.e. temperature often raises 1 DEG C, resistance reduction,
And 0.1) resistance change rate is, if test determines that resistance change rate is 0.7,0.3, i.e. resistance relative to the deviation of standard value 1
Diminish, then understand that temperature is proportional with resistance change rate, and temperature may improve 7 DEG C, that is, the temperature operated based on formula 1
For 52 DEG C.
Accordingly, between variation rate of magnetic flux and temperature can also be user (such as technical staff) to relation according to reality
What test was set in advance.As a rule, as the increase of temperature, magnetic flux can increase accordingly.For example, temperature often increases 1 DEG C,
Magnetic flux then increases by 0.1 (i.e. 10%), etc..Then the rate of change based on magnetic flux can learn the situation of change of temperature.
In actual applications, magnetic flux temperature coefficient is represented with TCF, then had：
TCF=(φm-φm0)*ΔT/φm0(formula 3)
Above-mentioned formula is deformed, then had：
TCF=(φm/φm0- 1) * Δs T (formula 4)
Wherein, φm/φm0For flux change rate, it can be calculated by formula 6 and obtained, and Δ T represents the variable quantity of temperature, its
For operating temperature and the absolute value of the difference of critical-temperature.Calculation formula based on above-mentioned TCF can draw magnetic flux and temperature it
Between proportionate relationship, can also calculate corresponding operating temperature.
For example, temperature threshold value is 40 DEG C, however, it is determined that after temperature exceedes critical temperature value, temperature often raises 1 DEG C, magnetic flux
Amount increase 0.1, if detection determines that variation rate of magnetic flux for increase 0.35, that is, shows that temperature increases 3.5 DEG C, therefore motor interior
Operating temperature be 43.5 DEG C.
In actual applications, because the change of temperature can typically each cause the change of resistance and magnetic flux, therefore can be based on
Two rates of change try to achieve the corresponding temperature of operating times when motor respectively, and then calculate the mean temperature of two gained temperature values
Value, and with regard to operating temperature of the average temperature value as motor interior, to improve the accuracy of result of calculation.For example, such as base
In resistance change rate and the corresponding relation of temperature, it is determined that the first temperature value be 62 DEG C, and be based on variation rate of magnetic flux and temperature
Corresponding relation, it is determined that second temperature value be 63 DEG C, then by both average value, i.e., 62.5 DEG C are defined as motor interior
Operating temperature.
As a rule, the live load of compressor is bigger, larger if desired for the temperature difference of regulation processing, then phase induction motor
Rotating speed also can be faster, and the rotating speed of motor will also result in the influence of the temperature of motor interior.Therefore, before S11, may be used also
To obtain the rotary speed parameter of motor operation, the work that the rotary speed parameter can characterize compressor in the equipment comprising motor is born
Lotus, then S12 process can also be based at least one rate of change and rotary speed parameter to determine the operating real time temperature of motor
's.
Specifically, when determining the operating temperature of motor based at least one rate of change, its process can include：True
When determining rotary speed parameter and being in first range of speeds, based on the corresponding relation between resistance change rate and temperature, motor is determined
Operating real time temperature；And when determining that rotary speed parameter is in second range of speeds, based between variation rate of magnetic flux and temperature
Corresponding relation, determine the operating real time temperature of motor, the maximum of first range of speeds is less than second range of speeds most
Small value.
I.e. according to the rotating speed of motor, can select to push away temperature based on corresponding variable quantity come counter, so as to realize to electronic
The accurate detection of the internal temperature of machine.
In present example example, based on the corresponding relation between parameter, at least one rate of change can be expressed as follows, its
In, variation rate of magnetic flux can be represented with formula 5, and resistance change rate can be represented with formula 6, i.e.,：
Wherein, φm0For initial magnetic flux amount parameter, φmTo operate real-time magnetic traffic parameter, r0For initial resistance parameter, r is
Real time resistance parameter is operated, w is motor speed, and i is the motor current of detection, and a, b are the fixed coefficient of ratio, KTFor temperature
Spend variation coefficient.
In actual applications, when motor speed is smaller, temperature coefficient is and larger in rotating speed mainly by Resistance Influence
When, resistance parameter influence is smaller, and temperature coefficient is mainly influenceed by magnetic flux parameter.
In the embodiment of the present invention, first range of speeds can be low-speed running scope, such as can be (0,200rad/s),
Second range of speeds can be high speed operating range, such as can be (200rad/s, 450rad/s], etc., this area skill
Art personnel can be configured according to actual conditions, and the embodiment of the present invention is not specifically limited to this.
Optionally, then can be based on the corresponding relation between resistance change rate and temperature come really in first range of speeds
Determine the operating temperature of motor.I.e. at the low rotational speed, the running parameter related to temperature is mainly resistance, then can pass through detection
And resistance change rate is calculated, and then corresponding temperature is determined, and the temperature determined calculating is as warm corresponding to motor interior
Degree.
For example, if the rotating speed of detection motor operation is less than 200rad/s, the equipment in first range of speeds, motor
Temperature coefficient be -0.75, if after testing determine resistance change rate for reduce 0.3 (i.e. 30%), the temperature residual quantity of respective change
For 4 DEG C, if temperature threshold value is 70 DEG C, the real-time temperature of motor operation is 74 DEG C.
Similarly, however, it is determined that the rotating speed of motor is larger, such as larger than 200rad/s or other critical values, then motor operation
Temperature and the correlation of variation rate of magnetic flux are bigger.At this point it is possible to it is electronic only to need the rate of change for detecting magnetic flux to calculate
Temperature inside machine, if for example, according to the corresponding relation between variation rate of magnetic flux and temperature, the temperature for calculating gained is 78
DEG C, you can the operating real time temperature using the temperature as motor interior.
In actual applications, because the stator of motor, rotor windings are all the insulation copper materials using certain class of insulation
Or made of copper cash.For the class of insulation according to the difference of insulating materials, the maximum temperature value that its work allows is that have certain limitation
(such as B-class insulation be 130 degree degrees Celsius).If temperature exceedes setting, the performance of insulating materials will degenerate, and accelerate insulation
Aging, it finally can also make insulation breakdown and burn, even result in burning for motor.Therefore, by motor interior temperature
Accurate detection, be advantageous in real time be monitored the temperature of electrode interior, so as to avoid its temperature too high, ensure that its normal is transported
OK.
Optionally, in the embodiment of the present invention, it is also based at least one rate of change and determines angle corresponding to motor
Error, and then angle compensation is carried out to motor based on angular error.For example, when it is determined that angle lags, hysteresis can be based on
Angle, such as 40 °, then can control more 40 ° of the rotations on the basis of being rotated by 360 ° of the rotor of motor.Accordingly, however, it is determined that
The angle of motor is forward, then motor rotor can be controlled to rotate respective angles less, so as to realize angle compensation.
As shown in Fig. 2 the equipment comprising motor includes the first determining module 201 and the second module in the embodiment of the present invention
202。
First determining module 201 is determined at least one rate of change in the equipment comprising motor, it is described extremely
A few rate of change includes variation rate of magnetic flux and/or resistance change rate corresponding to motor.
Second determining module 202 can be used for being based at least one rate of change, determine that the operating of the motor is real
Shi Wendu.
Specifically, the first determining module 201 can be used for：It is determined that in the equipment comprising motor motor operating
Real-time magnetic traffic parameter and operating resistance parameter；Based on the ratio between the operating magnetic flux parameter and initial magnetic flux amount parameter
Obtain the variation rate of magnetic flux；The resistance is determined based on the ratio between the operating resistance parameter and initial resistance parameter
Rate of change.
Optionally, the equipment comprising motor also includes：
Acquisition module, for obtaining the real-time rotary speed parameter of the motor operation；
Second determining module 202 is used to be based at least one rate of change and the rotary speed parameter, it is determined that described
The operating real time temperature of motor.
Optionally, second determining module 202 can be used for：
If it is determined that the rotary speed parameter is in first range of speeds, based on the corresponding pass between resistance change rate and temperature
System, determine the operating temperature of the motor；And
If it is determined that the rotary speed parameter is in second range of speeds, based between the variation rate of magnetic flux and temperature
Corresponding relation, determines the operating real time temperature of the motor, and the maximum of first range of speeds is less than described second turn
The minimum value of fast scope.
Optionally, the equipment comprising motor also includes the 3rd determining module and compensating module, wherein, the 3rd determines
Module is used for it is determined that after comprising at least one rate of change in the equipment of motor, based at least one rate of change,
Determine angular error corresponding to the motor；Compensating module, for carrying out angle to the motor based on the angular error
Degree compensation.
In the embodiment of the present invention, by determining at least one change in the equipment comprising motor during operation of air conditioner
Rate, at least one rate of change include variation rate of magnetic flux and/or resistance change rate corresponding to motor, so as to based at least one
Individual rate of change, you can determine the operating temperature of motor.And magnetic flux and ginseng that resistance is that workpiece is related in motor
Number, therefore the temperature conditions of motor interior more can be intuitively reflected by the rate of change of magnetic flux and resistance so that survey
Test result is more accurate closer to actual value, test result.
Simultaneously as according to variation rate of magnetic flux and resistance change rate, you can determine the temperature of motor interior, before this by
In motor interior true temperature can not be known, extreme case minimum value typically is used to direct current compressor motor protection, this
The scope that motor can be run is constrained significantly, and motor protection value can be made by obtaining motor running internal temperature in real time
It is changed into a function related to temperature, this has widened frequency-changeable compressor use range significantly, and makes convertible frequency air-conditioner operation more
Add reliable.
Embodiment 2
At present, direct current generator permanent magnet is forever common two kinds of materials of ferrite and rare earth, and two kinds of material demagnetization characteristics are different,
Terres rares demagnetization current rises and reduced with motor temperature, and low temperature demagnetization current is shown in Table greatly 1, and ferrite is then raised with temperature and
Increase, high temperature demagnetization current increase, is shown in Table 2.
A kind of rare earth brshless DC motor temperature of table 1 and the demagnetization current table of comparisons
| Temperature (DEG C) | 25 | 80 | 120 | 130 |
| The demagnetization rate of electric current (A) 5% | >=34 can not measure | 34 | 23 | 19 |
A kind of ferrite motor temperature of table 2 and ferrite current vs table
| Temperature (DEG C) | -20 | -10 | 0 | 25 | 50 | 80 | 100 | 130 |
| Electric current (A) | 23 | 25 | 25 | 26 | 29 | 29 | 30 | 32 |
To ensure motor safety operation, it is necessary to be controlled to motor maximum current, motor demagnetization problem is avoided the occurrence of, by
In not knowing motor actual inside temperature, so general motor only provides the minimum demagnetization current under least favorable environment temperature.It is aobvious
So, drive system hardware protection circuit can only also take this pattern, and this restrict motor operating range and section, and this is certain
Situation can only select the motor of more high standard to reach requirement, cause motor cost to rise.
Therefore, the method for the detection electromotor winding temperature of embodiment 1 is being utilized to obtain the winding temperature of compressor electric motor
Afterwards, embodiment 2 further provides for a kind of motor module and its control method, and motor is adjusted using the winding temperature dynamic of motor
Maximum permitted brave electric current, realize the operational effect for improving motor to greatest extent.
The motor module provided in the present embodiment includes：Memory module, detection module, driving current judge module, determination
Module；Wherein：Memory module is used to preserve at least one demagnetization current curve, and the demagnetization current curve is on winding temperature
With the curve of demagnetization current；Detection module is used for the winding temperature for detecting motor；Driving current judge module is used to read motor
Magnet feature, analyze the magnet feature whether preserve in a storage module corresponding to demagnetization current curve, if so, then from depositing
The demagnetization current curve is taken out in storage module, and motor is dynamically adjusted most according to winding temperature and the demagnetization current curve
Big electric current allowable, if not having, user is reminded to preserve demagnetization current curve corresponding to the magnet feature to memory module；Determine mould
Block is used for the length variable for determining a driving time, not surpass when ensuring and being operated using the driving current of maximum come motor
Cross a time threshold.
For specific use, if the motor module should can be used for DC frequency-changing pump motor or DC fan, due to
DC frequency-changing pump motor or DC fan can convenient mounting temperature sensor, therefore the detection module can be temperature
Sensor, motor module directly detect the winding temperature of motor using temperature sensor；If the motor module becomes applied to direct current
Frequency refrigeration system, due to being limited to the working environment of DC frequency-changeable compressor, it is difficult to mounting temperature sensor, therefore the detection
Module is a detection circuit, and detection module detects the parameter of direct current generator, is then based on the parameter of electric machine meter detected first
Calculate winding temperature, after DC frequency-changing refrigeration system dynamically adjusts the maximum allowable electric current of motor by motor module, direct current
The running ability baseline of DC frequency-changeable compressor motor is set dynamically using the maximum allowable electric current after adjustment for frequency-changeable compressor.
In addition it should be noted that for according to strict meaning, demagnetization current and maximum allowable electric current are different amounts,
Generally for making motor not demagnetize, and cause there is certain intervals section, maximum allowable between demagnetization current and maximum allowable electric current
Current value is typically below demagnetization current, such as：Demagnetization current=k* maximum allowable electric currents, k ＞ 1, or, demagnetization current=h+
Maximum allowable electric current, h are more than 0；But calculated sometimes for simplifying, demagnetization current and maximum allowable electric current can be regarded as phase
Same amount, the adoptable same variable quantity Ix of both of which are represented.
Based on above-mentioned motor module, a kind of control method for motor that embodiment provides, can be realized by following steps：
U1. prestored at least one demagnetization current curve Ix=f (Tr) to memory module, Ix is demagnetization current, and Tr is winding
Temperature.
This step can also be encoded first to motor magnet feature, for example, 001 be ferrite permanent magnet, 010 be rare earth forever
The forms such as magnet are carried out, by encoding classification and material that machine can be allowed quickly to distinguish permanent magnet.
U2. detection winding temperature.If the motor module should can be used for DC frequency-changing pump motor or DC fan, due to straight
Rheology frequency pump motor or DC fan can convenient mounting temperature sensor, therefore the detection module can be that temperature passes
Sensor, motor module directly detect the winding temperature of motor using temperature sensor；If the motor module is applied to DC frequency-changing
Refrigeration system, due to being limited to the working environment of DC frequency-changeable compressor, it is difficult to mounting temperature sensor, therefore the detection mould
Block is a detection circuit, and detection module detects the parameter of direct current generator first, and the parameter of electric machine for being then based on detecting calculates
Winding temperature Tr, winding temperature Tr specific solution mode are referring to embodiment 1.
U3. during compressor operating, the coding of the magnet feature of motor is first read, it is corresponding then to analyze the coding
Magnet feature, such as what is read be encoded to 010, then the feature of magnet is permanent magnet, and the material of the permanent magnet is rare earth；
Such as what is read is encoded to 001, then magnet is characterized as ferrite permanent magnet；Then further analyse whether to prestore the magnet
Demagnetization current curve corresponding to feature, if so, then take out the demagnetization current curve from memory module, and according to winding temperature with
And the demagnetization current curve dynamically adjusts the maximum allowable electric current of motor；If no, user is reminded to be preserved to memory module
Demagnetization current curve corresponding to the magnet feature, demagnetization current curve is corresponded to when user preserves the magnet feature to memory module
Afterwards, detection winding temperature, and demagnetization current curve is corresponded to according to winding temperature and the magnet feature and dynamically adjusts electricity again
The maximum allowable electric current of machine.
Meanwhile the length variable of a driving time can be also determined in this step by module, to ensure that adjustment is most every time
After big electric current allowable, the maximum driving current that system uses to be no more than a time threshold during motor operating, from
And make it that motor was not at the operating of long-time high load capacity, protect motor.
If the above method to be applied to the control of DC frequency-changing refrigeration system, when dynamically adjusting motor by motor module
Maximum allowable electric current after, can further using adjustment after maximum allowable electric current dynamic setting DC frequency-changeable compressor motor
Running ability baseline.
Embodiment 2 can avoid demagnetization by the way of smaller current limitation, direct current generator is being ensured reliable premise
Under, significantly extend motor can range of operation, it is cost-effective and reduce the rating of electric machine.
The general principle of the present invention and main feature are the foregoing described, the description of specification simply illustrates the original of the present invention
Reason, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes and improvements
It all fall within the protetion scope of the claimed invention.
Claims (10)
1. a kind of motor module, it is characterised in that including memory module, detection module and driving current judge module；
Memory module is used to preserve at least one demagnetization current curve, and the demagnetization current curve is on winding temperature and demagnetization
The curve of electric current；
Detection module is used for the winding temperature for detecting motor；
Driving current judge module is used for the magnet feature for reading motor, analyzes whether the magnet feature preserves in a storage module
Have corresponding demagnetization current curve, if so, then take out the demagnetization current curve from memory module, and according to winding temperature and
The demagnetization current curve dynamically adjusts the maximum allowable electric current of motor, if not having, reminding user to be preserved to memory module should
Demagnetization current curve corresponding to magnet feature.
2. a kind of motor module as claimed in claim 1, it is characterised in that be also used for including determining module, the determining module
The length variable of a driving time is determined, no more than one during ensuring operate come motor using the driving current of maximum
Time threshold.
3. a kind of motor module as claimed in claim 1 or 2, it is characterised in that the detection module is temperature sensor, electricity
Machine module directly detects the winding temperature of motor using temperature sensor.
4. a kind of motor module as claimed in claim 3, it is characterised in that the motor module is applied to DC frequency-changing water pump electricity
Machine or DC fan.
5. a kind of motor module as claimed in claim 1 or 2, it is characterised in that the detection module detects direct current first
The parameter of machine, the parameter of electric machine for being then based on detecting calculate winding temperature.
6. a kind of motor module as claimed in claim 5, it is characterised in that the motor module is applied to DC frequency-changing refrigeration system
System, DC frequency-changeable compressor dynamically adjust the maximum allowable electric current of motor in DC frequency-changing refrigeration system by motor module
Afterwards, the running ability baseline of DC frequency-changeable compressor motor is set dynamically using the maximum allowable electric current after adjustment.
7. a kind of motor module as claimed in claim 1, it is characterised in that the driving current judge module reads motor
Magnet be characterized as feature coding.
8. a kind of control method of motor, it is characterised in that comprise the following steps：
Prestored at least one demagnetization current curve to memory module, the demagnetization current curve is on winding temperature and demagnetization electricity
The curve of stream；
Detection winding temperature；
The magnet feature of motor is read, analyzes whether the magnet feature prestores demagnetization current curve, if so, then from memory module
Middle taking-up demagnetization current curve, and dynamically adjust according to winding temperature and the demagnetization current curve maximum allowable of motor
Electric current；If no, reminding user to preserve demagnetization current curve corresponding to the magnet feature to memory module, when user is to storage
Module is preserved after the magnet feature corresponds to demagnetization current curve, detection winding temperature, and according to winding temperature and the magnetic again
Body characteristicses correspond to the maximum allowable electric current that demagnetization current curve dynamically adjusts motor.
9. a kind of control method of motor as claimed in claim 8, it is characterised in that also including step：
The length variable of a driving time is determined, to be no more than when ensuring and being operated using the driving current of maximum come motor
One time threshold.
10. a kind of control method of motor as claimed in claim 8 or 9, it is characterised in that detection winding temperature methods are：
The winding temperature of motor is directly detected using temperature sensor, or, direct current generator parameter is detected first, is then based on detecting
The parameter of electric machine calculate winding temperature.
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| CN108981102A (en) * | 2018-07-04 | 2018-12-11 | 海信（山东）空调有限公司 | Air-cooled ducted air conditioner |
| CN110336518A (en) * | 2018-03-19 | 2019-10-15 | 罗伯特·博世有限公司 | Method for manipulating motor |
| CN112332729A (en) * | 2019-07-30 | 2021-02-05 | 丹佛斯（天津）有限公司 | Compressor and control method thereof |
| CN113296402A (en) * | 2021-05-18 | 2021-08-24 | 烟台工程职业技术学院(烟台市技师学院) | Control method of driving all-in-one machine system with temperature self-correction function |
| CN113922540A (en) * | 2021-10-12 | 2022-01-11 | 珠海格力电器股份有限公司 | Motor, control method and device thereof and vehicle |
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