CN109217776A - A kind of heating means of motor, device and frequency converter - Google Patents
A kind of heating means of motor, device and frequency converter Download PDFInfo
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- CN109217776A CN109217776A CN201811135624.9A CN201811135624A CN109217776A CN 109217776 A CN109217776 A CN 109217776A CN 201811135624 A CN201811135624 A CN 201811135624A CN 109217776 A CN109217776 A CN 109217776A
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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
- H02P29/62—Controlling or determining the temperature of the motor or of the drive for raising the temperature of the motor
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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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/048—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using AC supply for only the rotor circuit or only the stator circuit
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The embodiment of the present application discloses heating means, device and the frequency converter of a kind of motor.This method includes the high-frequency ac current for obtaining inverter and exporting to motor；Based on default calculation formula, practical heating power and corresponding actual current amplitude are calculated according to high-frequency ac current；It obtains given heating power and amplitude limiting processing is adjusted to obtain Injection Current frequency to given heating power and practical heating power；Integral Processing is carried out to obtain voltage vector angle to Injection Current frequency；It obtains given current amplitude and amplitude limiting processing is adjusted to given current amplitude and actual current amplitude to obtain adjusting voltage magnitude；Voltage vector angle and adjusting voltage magnitude are input to default pulse width modulator to generate pulse width modulating signal；Inverter is controlled to motor output high-frequency ac current according to pulse width modulating signal to heat to motor.The heating speed of motor can be improved in method in the present embodiment, realizes the adjustable of heating power.
Description
Technical field
This application involves motor control technology field more particularly to a kind of heating means of motor, device and frequency converter.
Background technique
When environment temperature is subzero 30~40 DEG C, compressor lubricant oil will coagulate air-conditioning system in the equipment such as automobile
Gu cooling medium becomes liquid, if starting air-conditioning system suddenly at this time, the load that will lead to motor is very heavy, and motor can not be successfully
Starting.In order to enable motor can smoothly start, generally requires and first motor is heated, so that cooling medium vaporizes, compression
Machine lubricating oil thaws, and then restarts air-conditioning system.
The method heated at present to motor mainly injects DC current to motor, utilizes the stator winding of motor
Copper loss and iron loss heat motor.However, the copper loss and iron loss due to the stator winding of motor only account for power of motor
Seldom a part, heating power very little, heating speed are very slow.
Therefore, how rapidly motor to be carried out being heated as technical problem urgently to be resolved.
Summary of the invention
This application provides a kind of heating means of motor, device and frequency converters, to improve the heating speed of motor.
In a first aspect, this application provides a kind of heating means of motor comprising:
Obtain the high-frequency ac current that inverter is exported to motor；
Based on default calculation formula, practical heating power is calculated according to high-frequency ac current and high-frequency ac current is corresponding
Actual current amplitude；
Obtain given heating power, and to the given heating power and practical heating power be adjusted amplitude limiting processing with
Obtain Injection Current frequency；
Integral Processing is carried out to obtain voltage vector angle to the Injection Current frequency；
Obtain given current amplitude, and to the given current amplitude and actual current amplitude be adjusted amplitude limiting processing with
It obtains adjusting voltage magnitude；
The voltage vector angle and adjusting voltage magnitude are input to default pulse width modulator to generate pulse width modulation
Signal；And
The inverter is controlled to motor output high-frequency ac current according to the pulse width modulating signal with right
The motor is heated.
Second aspect, the application also provide a kind of heating device of motor comprising:
Electric current acquiring unit, the high-frequency ac current exported for obtaining inverter to motor；
Computing unit, for calculating practical heating power and height according to high-frequency ac current based on default calculation formula
The corresponding actual current amplitude of frequency alternating current；
Power frequency adjusts unit, for obtaining given heating power, and to the given heating power and practical heating
Amplitude limiting processing is adjusted to obtain Injection Current frequency in power；
Azimuth acquiring unit, for carrying out Integral Processing to the Injection Current frequency to obtain voltage vector angle；
Voltage regulation unit, for obtaining given current amplitude, and to the given current amplitude and actual current amplitude
Amplitude limiting processing is adjusted to obtain adjusting voltage magnitude；
Signal generation unit, for by the voltage vector angle and adjust voltage magnitude be input to default pulse width modulator with
Generate pulse width modulating signal；And
Control unit exports high frequency to the motor for controlling the inverter according to the pulse width modulating signal
Alternating current is to heat the motor.
The third aspect, the application provide a kind of frequency converter again comprising memory, processor and are stored in the memory
Computer program that is upper and can running on the processor, the processor realize first party when executing the computer program
The heating means of the motor in face.
The application provides heating means, device and the frequency converter of a kind of motor.This method is handed over by inputting high frequency to motor
Galvanic electricity stream, so that the high-frequency ac current and its harmonic wave in stator winding generate eddy current in the rotor, to form vortex
Loss, releases a large amount of heat to heat to motor, improves the heating speed of motor.Meanwhile it being inputted to motor
When high-frequency ac current, heating power can be adjusted by changing size and the frequency of the high-frequency ac current at current time,
Realize the adjustable of heating power.
Detailed description of the invention
Technical solution in ord to more clearly illustrate embodiments of the present application, below will be to needed in embodiment description
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is some embodiments of the present application, general for this field
For logical technical staff, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of schematic flow diagram of the heating means of motor provided by the embodiments of the present application；
Fig. 2 is the control circuit block diagram of Frequency Converter Control motor heating power in the embodiment of the present application；
Fig. 3 is a kind of specific schematic flow diagram of the heating means of motor provided by the embodiments of the present application；
Fig. 4 is the specific control circuit block diagram of Frequency Converter Control motor heating power in the embodiment of the present application；
Fig. 5 is a kind of another specific schematic flow diagram of the heating means of motor provided by the embodiments of the present application；
Fig. 6 is another specific control circuit block diagram of Frequency Converter Control motor heating power in the embodiment of the present application；
Fig. 7 is a kind of specific schematic flow diagram of the heating means of motor provided by the embodiments of the present application；
Fig. 8 is a kind of specific schematic flow diagram of the heating means of motor provided by the embodiments of the present application；
Fig. 9 is a kind of schematic block diagram of the heating device of motor provided by the embodiments of the present application；
Figure 10 is a kind of schematic block diagram of frequency converter provided by the embodiments of the present application.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description, it is clear that described embodiment is some embodiments of the present application, instead of all the embodiments.Based on this Shen
Please in embodiment, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall in the protection scope of this application.
It should be appreciated that ought use in this specification and in the appended claims, term " includes " and "comprising" instruction
Described feature, entirety, step, operation, the presence of element and/or component, but one or more of the other feature, whole is not precluded
Body, step, operation, the presence or addition of element, component and/or its set.
Fig. 1 and Fig. 2 are please referred to, Fig. 1 is a kind of schematic flow diagram of the heating means of motor provided by the embodiments of the present application,
Fig. 2 is the control circuit block diagram of Frequency Converter Control motor heating power in the embodiment of the present application.The heating means application of the motor
In frequency converter.As shown in Figure 1, the heating means of the motor include step S101~S107.
S101, the high-frequency ac current that inverter is exported to motor is obtained.
In order to control the heating power that inverter 10 is exported to motor 20, need to obtain current time t inverter 10 to electricity
The high-frequency ac current i that machine 20 exportst。
In one embodiment, which can be three-phase pulse width modulated inverter, which can be for forever
Magnetic-synchro motor, DC brushless motor.
In one embodiment, before step S101, further includes: given heating power and given current amplitude are set.Its
In, the given heating power P0With given current amplitude I0It can be carried out by human-computer interaction interfaces such as Full Vehicle System, PLC, keyboards
Setting, the given current amplitude I0It can be the load current value of motor 20, certainly, the given current amplitude I0It can also be by giving
Determine heating power P0It is calculated.
It should be noted that the given heating power P0With given current amplitude I0It is configured except through aforesaid way
It outside, can also be the fixed value being stored in advance in frequency converter.
S102, it is based on default calculation formula, practical heating power and the height is calculated according to the high-frequency ac current
The corresponding actual current amplitude of frequency alternating current.
Specifically, in one embodiment, as shown in Figure 3 and Figure 4, Fig. 3 is a kind of motor provided by the embodiments of the present application
The specific schematic flow diagram of heating means, Fig. 4 are the specific control of Frequency Converter Control motor heating power in the embodiment of the present application
Circuit block diagram.Step S102 specifically includes step S1021 and S1022.
S1021, to the high-frequency ac current carry out Fast Fourier Transform (FFT) with obtain corresponding actual current amplitude and
Current phase angle.
S1022, it is based on heating power calculation formula, according to the adjusting voltage magnitude of last moment, the actual current width
Value and current phase angle calculate practical heating power.
In Fig. 3 and embodiment shown in Fig. 4, which includes Fast Fourier Transform (FFT) and heating power
Calculation formula.Specifically, high-frequency ac current i is takentIn u phase current it(u), then to electric current it(u) fast Fourier is carried out
Transformation is to obtain high-frequency ac current itCorresponding actual current amplitude ImAnd current phase angleThe tune of last moment is obtained again
Save voltage magnitude Vt-1, and according to the adjusting voltage magnitude V of last momentt-1, actual current amplitude ImAnd current phase angleIt adopts
The heating power calculation formula shown in following formula (1) calculates practical heating power P1。
It should be noted that in this embodiment, using voltage-phase as fixed phase.
Specifically, in another embodiment, as shown in Figure 5 and Figure 6, Fig. 5 is a kind of motor provided by the embodiments of the present application
Heating means another specific schematic flow diagram, Fig. 6 be the embodiment of the present application in Frequency Converter Control motor heating power it is another
One specific control circuit block diagram.In this embodiment, step S102 specifically includes step S1023 to S1025.
S1023, Clarke transform is carried out to the high-frequency ac current to obtain α current weight and β current weight.
S1024, the corresponding practical electricity of the high-frequency ac current is calculated according to the α current weight and β current weight
Flow amplitude.
S1025, it is based on heating power calculation formula, according to the adjusting voltage magnitude of last moment and voltage vector angle, institute
It states α current weight and β current weight calculates practical heating power.
In the examples shown in figure 5 and figure 6, which includes Clarke transform, amplitude calculation formula
With heating power calculation formula.Specifically, high-frequency ac current i is takentIn u phase current it(u), v phase current it(v) electric with w phase
Flow it(w), by u phase current it(u), v phase current it(v) and w phase current it(w) Clarke transform is carried out to obtain α current weight
it(α) and β current weight it(β).Then, by α current weight it(α) and β current weight it(β) is brought into shown in following formula (2)
Amplitude calculation formula in high-frequency ac current i is calculatedtCorresponding actual current amplitude Im。
In the examples shown in figure 5 and figure 6, shown in the following formula of heating power calculation formula (3):
P1=1.5 (Vt-1it(α)cosθt-1+Vt-1it(β)sinθt-1) (3)
In order to calculate practical heating power P1, need to obtain the adjusting voltage magnitude V of last momentt-1With voltage vector angle
θt-1, then by the adjusting voltage magnitude V of last momentt-1With voltage vector angle θt-1And α current weight it(α) and β component
Electric current it(β) is brought into heating power calculation formula shown in above-mentioned formula (3), obtains practical heating power P to calculate1。
S103, given heating power is obtained, and clipping is adjusted to the given heating power and practical heating power
Processing is to obtain Injection Current frequency.
Practical heating power P is calculated in step S1021Afterwards, it will acquire given heating power P0, and will be to given heating function
Rate P0With practical heating power P1Amplitude limiting processing is adjusted to obtain Injection Current frequency F.
Specifically, in one embodiment, as shown in fig. 7, Fig. 7 is a kind of heating side of motor provided by the embodiments of the present application
Amplitude limiting processing is adjusted to given heating power and practical heating power in step S103 in the specific schematic flow diagram of method
To obtain Injection Current frequency, step S1031 and S1032 are specifically included.
S1031, the given heating power and practical heating power are sequentially input to the first subtracter and the first PI tune
Device is saved to obtain reference current frequency.
S1032, amplitude limiting processing is carried out to the reference current frequency to obtain Injection Current frequency.
As shown in Fig. 2, by given heating power P0With practical heating power P1It sequentially inputs to the first subtracter 40 and first
Pi regulator 50, to obtain reference current frequency Fref.Then, then by the first limiter 60 to reference current frequency FrefInto
Row amplitude limiting processing is to obtain Injection Current frequency F.Specifically, to reference current frequency FrefAmplitude limiting processing is carried out to obtain
Injection Current frequency F within the scope of 0.5kHz to 2kHz.
S104, Integral Processing is carried out to the Injection Current frequency to obtain voltage vector angle.
As shown in Fig. 2, will be integrated by integrator 70 to Injection Current frequency F after obtaining Injection Current frequency F
Processing, to obtain voltage vector angle θ.The voltage vector angle θ by an input parameter as default pulse width modulator 80, with
Continuous pulse width modulating signal can be generated convenient for default pulse width modulator is after 80s.
S105, given current amplitude is obtained, and clipping is adjusted to the given current amplitude and actual current amplitude
Processing is to obtain adjusting voltage magnitude.
Specifically, in one embodiment, as shown in figure 8, Fig. 8 is a kind of heating side of motor provided by the embodiments of the present application
Clipping is adjusted to the given current amplitude and actual current amplitude in step S105 in the specific schematic flow diagram of method
Processing specifically includes S1051 and S1052 to obtain adjusting voltage magnitude.
S1051, the given current amplitude and actual current amplitude are sequentially input to the second subtracter and the 2nd PI tune
Device is saved to obtain reference voltage amplitude.
S1052, amplitude limiting processing is carried out to the reference voltage amplitude to obtain adjusting voltage magnitude.
As shown in Fig. 2, by given current amplitude I0The actual current amplitude I calculated with step S102mIt sequentially inputs to second
Subtracter 90 and the second pi regulator 100, to obtain reference voltage amplitude Vref, then, then pass through 110 pairs of the second limiter ginsengs
Examine voltage magnitude VrefAmplitude limiting processing is carried out to obtain adjusting voltage magnitude V.Adjusting voltage magnitude V will be as default pulsewidth tune
Another input parameter of device 80 processed, continuing in order to which default pulse width modulator is after 80s can be generated pulse width modulating signal.
S106, the voltage vector angle and adjusting voltage magnitude are input to default pulse width modulator to generate pulse width
Modulated signal.
After obtaining voltage vector angle θ respectively by step S104 and S105 and adjusting voltage magnitude V, by voltage vector angle
θ and adjusting voltage magnitude V are input in default pulse width modulator 80, so that default pulse width modulator 80 is according to voltage vector angle
θ and adjusting voltage magnitude V generate pulse width modulating signal.
In one embodiment, which can be space vector pulse width modulation (full name in English: Space
VectorPulse Width Modulation, referred to as: SVPWM) device, or sinusoidal pulse width modulation (full name in English:
Sinusoidal Pulse Width Modulation, referred to as: SPWM) device, default pulse width modulator 80 is not limited herein
System.
S107, the inverter is controlled according to the pulse width modulating signal to motor output high-frequency ac current
To be heated to the motor.
After generating pulse width modulating signal, it is defeated to motor 20 inverter 10 will to be controlled according to pulse width modulating signal
Corresponding high-frequency ac current i outt+1, so that motor 20 enters locked rotor condition because of step-out.Specifically, according to pulse width tune
Signal processed controls inverter 10 for DC bus-bar voltage UdcIt is modulated into high-frequency ac current it+1, and by high-frequency ac current it+1It is defeated
Enter to the stator winding of motor 20, so that motor 20 enters locked rotor condition because of step-out, the high-frequency ac current and its harmonic wave exist
Eddy current is generated in the rotor of motor 20, to form eddy-current loss, releases a large amount of heat to add to motor 20
Heat improves the heating speed of motor 20.
It is understood that being obtained for the first time when the heating means of the motor using the application heat motor 20
The value for the high-frequency ac current that the inverter 10 taken is exported to motor 20 is 0, successively by step S101 to S107
Circulation adjust after, inverter 10 becomes nonzero value to the value for the high-frequency ac current that motor 20 exports, and gradually level off to
Constant current amplitude.
The heating means of motor in the present embodiment not only can be improved the heating speed of motor 20, also be closed by power
Ring adjusts to realize the adjustable of heating power.Meanwhile using the heating means, no matter motor 20 is rotated from normal with load situation
It is switched to the mode heated using the heating means to motor 20, or motor 20 is heated using the heating means
During, the carrier frequency when carrier frequency of inverter 10 can be using its normal operation does not need to carry out carrier frequency
The switching of rate.
Referring to Fig. 9, Fig. 9 is a kind of schematic block diagram of the heating device of motor provided by the embodiments of the present application.The electricity
The heating device 200 of machine is applied in frequency converter.The heating device 200 of the motor includes electric current acquiring unit 201, computing unit
202, power frequency adjusts unit 203, azimuth acquiring unit 204, voltage regulation unit 205, signal generation unit 206 and control
Unit 207 processed.
Electric current acquiring unit 201, the high-frequency ac current exported for obtaining inverter to motor.
Computing unit 202, for calculating practical heating function according to the high-frequency ac current based on default calculation formula
Rate and the corresponding actual current amplitude of the high-frequency ac current.
In one embodiment, which is specifically used for carrying out fast Fourier change to the high-frequency ac current
It changes to obtain corresponding actual current amplitude and current phase angle；And it is based on heating power calculation formula, according to last moment
Adjusting voltage magnitude, the actual current amplitude and current phase angle calculate practical heating power.
In another embodiment, which is specifically used for carrying out Clarke transform to the high-frequency ac current
To obtain α current weight and β current weight；The high-frequency ac current is calculated according to the α current weight and β current weight
Corresponding actual current amplitude；And it is based on heating power calculation formula, according to the adjusting voltage magnitude and voltage of last moment
Azimuth, the α current weight and β current weight calculate practical heating power.
Power frequency adjusts unit 203, adds for obtaining given heating power, and to the given heating power and reality
Amplitude limiting processing is adjusted to obtain Injection Current frequency in thermal power.
In one embodiment, which adjusts unit 203 when amplitude limiting processing is adjusted, and being specifically used for will be described
Given heating power and practical heating power are sequentially input to the first subtracter and the first pi regulator to obtain reference current frequency
Rate；And amplitude limiting processing is carried out to obtain Injection Current frequency to the reference current frequency.
Further, which adjusts unit 203 when carrying out amplitude limiting processing, is specifically used for the reference current
Frequency carries out amplitude limiting processing to obtain the Injection Current frequency within the scope of 0.5kHz to 2kHz.
Azimuth acquiring unit 204, for carrying out Integral Processing to the Injection Current frequency to obtain voltage vector angle.
Voltage regulation unit 205, for obtaining given current amplitude, and to the given current amplitude and actual current width
Amplitude limiting processing is adjusted to obtain adjusting voltage magnitude in value.
In one embodiment, for the voltage regulation unit 205 when amplitude limiting processing is adjusted, being specifically used for will be described given
Current amplitude and actual current amplitude are sequentially input to the second subtracter and the second pi regulator to obtain reference voltage amplitude；With
And amplitude limiting processing is carried out to the reference voltage amplitude to obtain adjusting voltage magnitude.
Signal generation unit 206, for the voltage vector angle and adjusting voltage magnitude to be input to default pulsewidth modulation
Device is to generate pulse width modulating signal.
In one embodiment, which can be space vector pulse width modulation (full name in English: Space
Vector Pulse Width Modulation, referred to as: SVPWM) device, or sinusoidal pulse width modulation (full name in English:
Sinusoidal Pulse Width Modulation, referred to as: SPWM) device, default pulse width modulator is not limited herein.
Control unit 207 is exported for controlling the inverter according to the pulse width modulating signal to the motor
High-frequency ac current is to heat the motor.
In one embodiment, which includes three-phase pulse width modulated inverter, which includes permanent magnet synchronous electric
Machine, DC brushless motor.
It should be noted that it is apparent to those skilled in the art that, for convenience of description and succinctly,
The heating device 200 of the motor of foregoing description and the specific work process of each unit can refer to the heating means of aforementioned motor
Corresponding process in embodiment, details are not described herein.
The heating device 200 of motor in the present embodiment, not only can be improved the heating speed of motor, is also closed by power
Ring adjusts to realize the adjustable of heating power.
Referring to Fig. 10, Figure 10 is a kind of schematic block diagram of frequency converter provided by the embodiments of the present application.The frequency converter 300
Including processor 301, memory 302 and it is stored in the computer program that can be run on memory 302 and on processor 301
3021, which may be implemented any one motor in the above embodiments of the present application when executing the computer program 3021
Heating means.The heating means of the motor of the application have been done due to front and have been introduced in detail, in order to illustrate the letter of book
Clean property, details are not described herein.
Those of ordinary skill in the art may be aware that list described in conjunction with the examples disclosed in the embodiments of the present disclosure
Member and algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware
With the interchangeability of software, each exemplary composition and step are generally described according to function in the above description.This
A little functions are implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Specially
Industry technical staff can use different methods to achieve the described function each specific application, but this realization is not
It is considered as beyond scope of the present application.
In several embodiments provided herein, it should be understood that disclosed device and method can pass through it
Its mode is realized.For example, the apparatus embodiments described above are merely exemplary.For example, the division of each unit is only
Only a kind of logical function partition, there may be another division manner in actual implementation.
Step in the embodiment of the present application method can be sequentially adjusted, merged and deleted according to actual needs.This Shen
Please the unit in embodiment device can be combined, divided and deleted according to actual needs.In addition, in each implementation of the application
Each functional unit in example can integrate in one processing unit, is also possible to each unit and physically exists alone, can also be with
It is that two or more units are integrated in one unit.Above-mentioned integrated unit both can take the form of hardware realization,
It can also realize in the form of software functional units.
The above, the only specific embodiment of the application, but the protection scope of the application is not limited thereto, it is any
Those familiar with the art within the technical scope of the present application, can readily occur in various equivalent modifications or replace
It changes, these modifications or substitutions should all cover within the scope of protection of this application.Therefore, the protection scope of the application should be with right
It is required that protection scope subject to.
Claims (10)
1. a kind of heating means of motor characterized by comprising
Obtain the high-frequency ac current that inverter is exported to motor；
Based on default calculation formula, practical heating power and the high-frequency ac current are calculated according to the high-frequency ac current
Corresponding actual current amplitude；
Given heating power is obtained, and amplitude limiting processing is adjusted to obtain to the given heating power and practical heating power
Injection Current frequency；
Integral Processing is carried out to obtain voltage vector angle to the Injection Current frequency；
Given current amplitude is obtained, and amplitude limiting processing is adjusted to obtain to the given current amplitude and actual current amplitude
Adjust voltage magnitude；
The voltage vector angle and adjusting voltage magnitude are input to default pulse width modulator to generate pulse width modulating signal；
And
The inverter is controlled to motor output high-frequency ac current to described according to the pulse width modulating signal
Motor is heated.
2. the heating means of motor according to claim 1, which is characterized in that it is described to be based on default calculation formula, according to
The high-frequency ac current calculates practical heating power and the corresponding actual current amplitude of the high-frequency ac current, comprising:
Fast Fourier Transform (FFT) is carried out to obtain corresponding actual current amplitude and current phase angle to the high-frequency ac current；
And
Based on heating power calculation formula, according to the adjusting voltage magnitude of last moment, the actual current amplitude and electric current phase
Parallactic angle calculates practical heating power.
3. the heating means of motor according to claim 1, which is characterized in that it is described to be based on default calculation formula, according to
The high-frequency ac current calculates practical heating power and the corresponding actual current amplitude of the high-frequency ac current, comprising:
Clarke transform is carried out to obtain α current weight and β current weight to the high-frequency ac current；
The corresponding actual current amplitude of the high-frequency ac current is calculated according to the α current weight and β current weight；And
Based on heating power calculation formula, according to the adjusting voltage magnitude of last moment and voltage vector angle, the α current weight
Practical heating power is calculated with β current weight.
4. the heating means of motor according to claim 1, which is characterized in that described to the given heating power and reality
Amplitude limiting processing is adjusted to obtain Injection Current frequency in border heating power, comprising:
The given heating power and practical heating power are sequentially input to the first subtracter and the first pi regulator to obtain
Reference current frequency；And
Amplitude limiting processing is carried out to obtain Injection Current frequency to the reference current frequency.
5. the heating means of motor according to claim 4, which is characterized in that described to be carried out to the reference current frequency
Amplitude limiting processing is to obtain Injection Current frequency, comprising: carries out amplitude limiting processing to the reference current frequency to obtain 0.5kHz extremely
Injection Current frequency within the scope of 2kHz.
6. the heating means of motor according to claim 1, which is characterized in that described to the given current amplitude and reality
Amplitude limiting processing is adjusted to obtain adjusting voltage magnitude in border current amplitude, comprising:
The given current amplitude and actual current amplitude are sequentially input to the second subtracter and the second pi regulator to obtain
Reference voltage amplitude；And
Amplitude limiting processing is carried out to the reference voltage amplitude to obtain adjusting voltage magnitude.
7. the heating means of motor according to claim 1, which is characterized in that the default pulse width modulator includes space
Vector Pulse Width Modulation device or sine pulse width modulator.
8. the heating means of motor according to claim 1, which is characterized in that the motor include permanent magnet synchronous motor or
DC brushless motor.
9. a kind of heating device of motor characterized by comprising
Electric current acquiring unit, the high-frequency ac current exported for obtaining inverter to motor；
Computing unit, for calculating practical heating power and institute according to the high-frequency ac current based on default calculation formula
State the corresponding actual current amplitude of high-frequency ac current；
Power frequency adjusts unit, for obtaining given heating power, and to the given heating power and practical heating power
Amplitude limiting processing is adjusted to obtain Injection Current frequency；
Azimuth acquiring unit, for carrying out Integral Processing to the Injection Current frequency to obtain voltage vector angle；
Voltage regulation unit is carried out for obtaining given current amplitude, and to the given current amplitude and actual current amplitude
Amplitude limiting processing is adjusted to obtain adjusting voltage magnitude；
Signal generation unit, for the voltage vector angle and adjusting voltage magnitude to be input to default pulse width modulator to generate
Pulse width modulating signal；And
Control unit exports high-frequency ac to the motor for controlling the inverter according to the pulse width modulating signal
Electric current is to heat the motor.
10. a kind of frequency converter, which is characterized in that including memory, processor and be stored on the memory and can be described
The computer program run on processor, the processor are realized when executing the computer program as appointed in claim 1 to 8
The step of the method for anticipating.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811135624.9A CN109217776B (en) | 2018-09-27 | 2018-09-27 | Heating method and device of motor and frequency converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811135624.9A CN109217776B (en) | 2018-09-27 | 2018-09-27 | Heating method and device of motor and frequency converter |
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| CN109217776A true CN109217776A (en) | 2019-01-15 |
| CN109217776B CN109217776B (en) | 2020-10-20 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN112039383A (en) * | 2019-05-14 | 2020-12-04 | 麦克维尔空调制冷(武汉)有限公司 | Motor control method, motor control device and motor system |
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| WO2023237086A1 (en) * | 2022-06-10 | 2023-12-14 | 谷轮环境科技（苏州）有限公司 | Electric control apparatus and electric control method |
| WO2024082683A1 (en) * | 2022-10-17 | 2024-04-25 | 广东美的制冷设备有限公司 | Electric motor heating method and system, and storage medium and air conditioner |
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| CN109873575A (en) * | 2019-02-27 | 2019-06-11 | 深圳英驱新能源有限公司 | The starting method and device of electric system under automobile, ultra-low temperature surroundings |
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| CN112039383A (en) * | 2019-05-14 | 2020-12-04 | 麦克维尔空调制冷(武汉)有限公司 | Motor control method, motor control device and motor system |
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| CN112751467B (en) * | 2020-12-29 | 2022-04-15 | 精进电动科技股份有限公司 | Self-heating method and water inlet maintenance method for driving motor |
| WO2023237086A1 (en) * | 2022-06-10 | 2023-12-14 | 谷轮环境科技（苏州）有限公司 | Electric control apparatus and electric control method |
| WO2024082683A1 (en) * | 2022-10-17 | 2024-04-25 | 广东美的制冷设备有限公司 | Electric motor heating method and system, and storage medium and air conditioner |
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