CN108322127A - Electric motor fan and air flow property adjustment equipment - Google Patents
Electric motor fan and air flow property adjustment equipment Download PDFInfo
- Publication number
- CN108322127A CN108322127A CN201710036044.3A CN201710036044A CN108322127A CN 108322127 A CN108322127 A CN 108322127A CN 201710036044 A CN201710036044 A CN 201710036044A CN 108322127 A CN108322127 A CN 108322127A
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- CN
- China
- Prior art keywords
- motor
- current
- electric
- inverter
- electric motor
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
-
- 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
- H02P27/06—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 dc to ac converters or inverters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The application provides a kind of electric motor fan and the air flow property adjustment equipment including the electric motor fan, and the electric motor fan includes motor, inverter, current detecting unit and controller.The inverter includes multiple thyristors and is that alternating current is supplied to motor by DC inverter；The electric current of the motor is flowed through in current detecting unit acquisition in real time；When the electric current of motor is more than current limit threshold, the step mode of controller control inverter is to reduce output to the equivalent driving voltage of motor.Electric motor fan provided in an embodiment of the present invention and air flow property adjustment equipment can automatically adjust motor speed, and in the low noise operation for ensureing enough wind flows under different static pressure operating modes.
Description
Technical field
The present invention relates to technical field of motors, more particularly to are applied to the motor of air flow property adjustment equipment.
Background technology
The systems such as ventilation, smoke exhaust ventilator are usually driven by fan and realize that air flow property is adjusted.Fig. 1 is shown in the prior art
Interior uses the signal of air flow property adjustment equipment Point Drifting of motor after static pressure becomes smaller similar to d.c. motor
Figure.From figure 1 it appears that when such as external wind pressure, pipeline situation variation causes the static pressure of system to change, as static pressure subtracts
Hour, the operating point of motor is displaced to the B points of fan characteristic S2 from the A points of fan characteristic S1, although motor speed
Decline but rotating speed is still very high, torque increase, the air quantity increase for causing motor to export will produce larger noise, and actually make
With air quantity that often need not be so big.
Invention content
In view of this, it is necessary to provide a kind of electric motor fan and air flow property adjustment equipment, in different static pressure operating modes
Under, motor speed is automatically adjusted, and in the low noise operation for ensureing enough wind flows.
The embodiment of the present invention provides a kind of electric motor fan, including：
Motor；
Inverter is configured as including multiple thyristors and DC voltage inversion is supplied to electricity for alternating current
Machine；
Current detecting unit is configured as acquiring the electric current for flowing through the motor in real time；And
Controller is configured as, when the electric current of motor is more than current limit threshold, controlling the step mode of inverter to reduce
It exports to the equivalent driving voltage of motor.
As a preferred embodiment, when the electric current of motor is more than current limit threshold, the controller controls the inverter
In thyristor repeat the operation of shutdown and conducting.
As a preferred embodiment, when the electric current of motor is more than current limit threshold, in a commutating period, the motor
Driving voltage include the not equal pulse of several width.
As a preferred embodiment, when the electric current of motor is more than current limit threshold, the commutating period of the motor includes more
A regulating cycle, each regulating cycle include turn-on time section and turn-off time section；In turn-on time section, the controller control
Corresponding semiconductor switching elements conductive in the inverter makes electrical power, when off between section, the controller controls institute
Stating the shutdown of the corresponding semiconductor switch element in inverter makes motor power off.
As a preferred embodiment, in the same commutating period of motor, the duration of each regulating cycle is identical or different,
The duration of the turn-on time section of each regulating cycle is identical or different.
As a preferred embodiment, in the same commutating period of motor, the controller repeats following procedure：
One scheduled delay time of thyristor when electric current is more than current limit threshold in shutdown inverter；
The thyristor is connected in the controller after the scheduled delay time.
As a preferred embodiment, described when the electric current of motor is more than current limit threshold in the commutating period of the motor
Current of electric remains essentially as the current limit threshold.
As a preferred embodiment, in the commutating period of the motor, electric current is chopped into repeatedly after rising to overcurrent threshold value.
The embodiment of the present invention provides a kind of air flow property adjustment equipment, including any one of them motor wind as above
Fan.
As a preferred embodiment, the air flow property adjustment equipment is air interchanger, air blower or smoke exhaust ventilator.
According to an embodiment of the invention, judge whether electric current is more than current limit threshold, works as electric current in the operational process of motor
When more than current limit threshold, reduce the equivalent driving voltage for being provided to motor, even if air flow property adjustment equipment can be made in outside
Environment changes or the interior arrangement of air flow property adjustment equipment, for example, pipeline shorten after reduce gas-flow resistance, cause
The equivalent driving voltage that motor is reduced when static pressure changes, in the low noise operation for ensureing enough wind flows.
Description of the drawings
In attached drawing：
Fig. 1 shows that the indoor static pressure using the air flow property adjustment equipment similar to d.c. motor becomes smaller in the prior art
The schematic diagram of the operating point offset of motor afterwards.
Fig. 2 is the structure diagram of the electric motor fan of one embodiment of the invention.
Fig. 3 shows the motor that the air flow property adjustment equipment using the embodiment of the present invention redefines after static pressure becomes smaller
Operating point and the prior art operating point comparison diagram.
Fig. 4 is the oscillogram of the motor driven voltage of one embodiment of the invention.
Fig. 5 is the oscillogram of the current of electric of one embodiment of the invention.
Main element symbol description
Following specific implementation mode will be further illustrated the present invention in conjunction with above-mentioned attached drawing.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.It is appreciated that attached drawing is only for reference and description, not it is used for this hair
It is bright to limit.The size shown in attached drawing does not limit proportionate relationship only for ease of clearly describing.
It should be noted that when a component is considered as " connection " another component, it can be directly to separately
One component may be simultaneously present component placed in the middle.Unless otherwise defined, all technologies used herein and section are academic
Language has the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.Herein in the description of the invention
Used term, which is only for the purpose of describing specific embodiments, is not intended to limit the present invention.
Referring to FIG. 2, the electric motor fan 10 of one embodiment of the invention is applicable to such as air interchanger, air blower, smoke pumping
Machine etc. has the electrical equipment of air flow regulator function.The electric motor fan 10 of the embodiment of the present invention can have air stream described
The electrical equipment of dynamic regulatory function external environment change cause static pressure P to change when or electrical equipment interior arrangement
(such as after exhaust duct shortens) gas-flow resistance automatically adjusts motor speed when reducing, and the case where ensureing enough wind flows
Under run with low noise.
The electric motor fan 10 of one embodiment of the invention includes AC-DC converter 12, DC to DC converter 14, control
Device 15, inverter 16, motor 20, current detecting unit 18 and the flabellum (not shown) etc. driven by motor 20.Wherein, preferably
, the motor 20 can be brushless direct-current (BLDC) motor, include stator with stator coil, magnetic-coupled forever with stator
Magnet rotor.The AC-DC converter 12 is used to AC power being converted to DC power supply, the DC to DC converter 14
For 12 transformed DC power supply of the AC-DC converter to be depressured, the processing such as voltage stabilizing to provide voltage value be big
What majority circuit generally used is less than the voltage (such as 24V) that 40V stablizes and each circuit in electric motor fan 10 is supplied to be used as directly
Flow working power.The controller 15 is used for through 16 driving motor 20 of the inverter, and the inverter 16 may include by half
The H-bridge circuit of conductor switch element composition, is powered by DC power supply, is that alternating current is supplied to motor 20 by DC inverter；Institute
The switching frequency and turn-on time for stating thyristor can be controlled by the controller 15 so that stator coil is with defined
Mode is powered, to generate continuous torque.The current detecting unit 18 includes the low potential side (direct current positioned at inverter 16
The negative side of power supply) detection resistance, the electric current for flowing through motor 20 is converted to by sampled voltage by detection resistance and is input to institute
State controller 15.
Please refer to Fig.3, it is assumed that 20 work at present of motor in the intersection point A of motor characteristic curve L1 and fan characteristic S1,
20 full speed running of motor, the driving voltage of motor are straight line in the waveform of a commutating period.When such as external wind pressure, pipeline situation
Equal variations cause the static pressure of system to change, and if the static pressure of system becomes smaller, fan characteristic are caused to be displaced to fan from S1
When characteristic curve S2, if will still lead to torque increase, the motor of motor output with original driving voltage driving motor 20
Electric current increase, air quantity increase and generate larger noise, such as B points in figure.In embodiment of the present invention, the electric current of motor is limited
System is within the scope of current limit threshold, and when the variations such as external wind pressure, pipeline situation cause static pressure to become small, the torque of motor is not enough to gram
The required torque of fan is taken, at this moment the rotating speed of motor and fan is reduced automatic until the two balances the C points such as Fig. 3.
Physical process on the contrary it is also apparent that.
In present embodiment, the thyristor weight controlled in the inverter 16 may be used in the controller 15
It is multiple to execute the operation of shutdown and conducting, and the time of shutdown and conducting is controlled to reduce output to the equivalent driving voltage of motor.
Referring to FIG. 4, the electric current when motor is more than current limit threshold, a commutating period of motor includes multiple regulating cycles
The duration of T1, the regulating cycle T1 can be set according to the clock signal of controller 15, and each regulating cycle T1 includes
Turn-on time section Ton and turn-off time section Toff, in turn-on time section Ton, the controller 15 controls in the inverter 16
Corresponding semiconductor switching elements conductive, when off between section Toff, the controller 15 controls the phase in the inverter 16
Thyristor is answered to turn off.It will be understood by those skilled in the art that in each commutating period, the semiconductor that need to be connected is opened
Element is closed to be determined according to the position of magnetic pole of 20 rotor of motor.The position of magnetic pole of rotor can be detected by position sensor and be obtained,
Such as electric motor fan 10 may include Hall sensor, can detect rotor magnetic pole position by Hall sensor.In the present invention
Change embodiment in, the position of magnetic pole of the rotor can also such as be passed through by the method for position-sensor-free detects motor
The method of counter electromotive force obtain, certainly can also adopt the position for obtaining rotor with other methods, no longer arrange one by one herein
It lifts.
In each regulating cycle T1, the duration of the turn-on time section Ton can be the same or different, for example, every
When the rising edge of the clock signal of a regulating cycle T1 arrives, the controller 15 controls thyristor conducting, described
The electric current of motor is flowed through in the also detection in real time of controller 15, and when electric current is more than current limit threshold, the controller 15 turns off semiconductor
Switch element, because of influence of the counter electromotive force of motor to electric current, the duration of each regulating cycle T1 turn-on time sections Ton may
It is identical may also be different, i.e. the duration of the turn-on time section Ton of regulating cycle T1 is variable.Reflect the driving voltage of motor
On waveform, in a commutating period, the driving voltage of the motor includes the not equal pulse of several width.Correspondingly, please join
Fig. 5 is examined, is the current waveform figure of motor, from fig. 5, it can be seen that in a commutating period of motor, electric current rises to current limliting
It can be chopped into after threshold value repeatedly, make electric current keep current limit threshold constant substantially, described be held essentially constant refers to curent change
Amplitude is no more than the 10% of current limit threshold.
In summary, the controller 15 alternately controls the conducting of thyristor after electric current is more than current limit threshold
And shutdown, so that the driving equivalent voltage of motor is continuously decreased, to reduce the rotating speed of motor, reduces the output of wind flow.Finally, it asks
With reference to figure 3, the C points for making the operating point of motor be moved on fan characteristic S2, the controller 15 can maintain at C points
Rotating speed or the constant form driving motor of voltage, because the torque of Ma Da With fans has reached new balance at this time.It can from Fig. 3
Know, the rotating speed of motor is remarkably decreased compared to A points at C points, and the torque of motor is constant or slightly increases, compared to the prior art in B points,
The noise of motor can be effectively reduced.
Those skilled in the art be further appreciated that the present invention other change embodiments in, the regulating cycle
Duration is also variable, for example, when electric current is more than current limit threshold, the semiconductor that the controller 15 turns off in inverter 16 is opened
One scheduled delay time of element is closed, after scheduled delay time, the semiconductor switch is connected in the controller 15 again
Element, when lower primary current is more than current limit threshold, the controller 15 turns off the member of the semiconductor switch in inverter 16 again
The scheduled delay time of part, so repeats, because the length of the turn-on time section of thyristor is different every time, institute
The duration for stating regulating cycle also can be different.In other change embodiments of the present invention, the duration of the regulating cycle and lead
The duration of logical period may be fixed value.
According to an embodiment of the invention, even if air flow property adjustment equipment can be made to change or air in external environment
The interior arrangement of mobility adjustment equipment, such as after pipeline shortens, reduce gas-flow resistance, adjusted when static pressure being caused to change
The equivalent driving voltage of motor, to reduce the noise that equipment generates after static pressure becomes smaller.It will be understood to those skilled in the art that institute
Numerical computations and/or information processing can be carried out automatically according to the program for being previously set or storing by stating controller, and hardware includes
But be not limited to microprocessor, application-specific integrated circuit (Application Specific Integrated Circuit, ASIC),
Programmable gate array (Field-Programmable Gate Array, FPGA), digital processing unit (Digital Signal
Processor, DSP), PAL, GAL, PLD etc..It, can in large-scale production when the controller selects application-specific integrated circuit
More effectively to reduce the cost of equipment.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Profit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent requirements of the claims
Variation includes within the present invention.
Finally it should be noted that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although reference
Preferred embodiment describes the invention in detail, it will be understood by those of ordinary skill in the art that, it can be to the present invention's
Technical solution is modified or equivalent replacement, without departing from the spirit of the technical scheme of the invention and range.
Claims (10)
1. a kind of electric motor fan, including：
Motor；
Inverter is configured as including multiple thyristors and DC voltage inversion is supplied to motor for alternating current；
Current detecting unit is configured as acquiring the electric current for flowing through the motor in real time；And
Controller is configured as when the electric current of motor is more than current limit threshold, controls the step mode of inverter to reduce output
To the equivalent driving voltage of motor.
2. electric motor fan as described in claim 1, which is characterized in that when the electric current of motor is more than current limit threshold, the control
Device processed controls the operation that the thyristor in the inverter repeats shutdown and conducting.
3. electric motor fan as described in claim 1, which is characterized in that when the electric current of motor is more than current limit threshold, at one
In commutating period, the driving voltage of the motor includes the not equal pulse of several width.
4. electric motor fan as described in claim 1, which is characterized in that when the electric current of motor is more than current limit threshold, the electricity
The commutating period of machine includes multiple regulating cycles, and each regulating cycle includes turn-on time section and turn-off time section；In conducting
Between section, the controller, which controls the corresponding semiconductor switching elements conductive in the inverter, makes electrical power, when off between
Section, the controller, which controls the shutdown of the corresponding semiconductor switch element in the inverter, makes motor power off.
5. electric motor fan as claimed in claim 4, which is characterized in that in the same commutating period of motor, each adjusting week
The duration of phase is identical or different, and the duration of the turn-on time section of each regulating cycle is identical or different.
6. electric motor fan as described in claim 1, which is characterized in that in the same commutating period of motor, the controller
Repeat following procedure：
One scheduled delay time of thyristor when electric current is more than current limit threshold in shutdown inverter；And
Thyristor is connected after the scheduled delay time.
7. electric motor fan as described in claim 1, which is characterized in that in the commutating period of the motor, when the electric current of motor
When more than current limit threshold, the current of electric remains essentially as the current limit threshold.
8. electric motor fan as described in claim 1, which is characterized in that in the commutating period of the motor, electric current rises to limit
It is chopped into repeatedly after stream threshold value.
9. a kind of air flow property adjustment equipment, including such as claim 1-8 any one of them electric motor fans.
10. air flow property adjustment equipment as claimed in claim 9, which is characterized in that the air flow property adjustment equipment
For air interchanger, air blower or smoke exhaust ventilator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710036044.3A CN108322127A (en) | 2017-01-18 | 2017-01-18 | Electric motor fan and air flow property adjustment equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710036044.3A CN108322127A (en) | 2017-01-18 | 2017-01-18 | Electric motor fan and air flow property adjustment equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108322127A true CN108322127A (en) | 2018-07-24 |
Family
ID=62892087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710036044.3A Pending CN108322127A (en) | 2017-01-18 | 2017-01-18 | Electric motor fan and air flow property adjustment equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108322127A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112283891A (en) * | 2019-07-23 | 2021-01-29 | 青岛海尔空调电子有限公司 | Debugging method for air conditioner |
| CN112311299A (en) * | 2020-09-18 | 2021-02-02 | 华帝股份有限公司 | Motor control method and cooking device applying same |
-
2017
- 2017-01-18 CN CN201710036044.3A patent/CN108322127A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112283891A (en) * | 2019-07-23 | 2021-01-29 | 青岛海尔空调电子有限公司 | Debugging method for air conditioner |
| CN112283891B (en) * | 2019-07-23 | 2022-03-29 | 青岛海尔空调电子有限公司 | Debugging method for air conditioner |
| CN112311299A (en) * | 2020-09-18 | 2021-02-02 | 华帝股份有限公司 | Motor control method and cooking device applying same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180724 |
|
| WD01 | Invention patent application deemed withdrawn after publication |