CN102664570B - Lampblack absorber - Google Patents
Lampblack absorber Download PDFInfo
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- CN102664570B CN102664570B CN201210129141.4A CN201210129141A CN102664570B CN 102664570 B CN102664570 B CN 102664570B CN 201210129141 A CN201210129141 A CN 201210129141A CN 102664570 B CN102664570 B CN 102664570B
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- current machine
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- control unit
- motor drive
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Abstract
The present invention proposes a kind of lampblack absorber, comprising: the direct current machine that closed loop connects, direct-current machine counter electromotive detecting unit, main control unit and electric-motor drive unit; Main control unit is used for the back electromotive force of the direct current machine detected according to direct-current machine counter electromotive detecting unit, the duty ratio of regulation output; The duty ratio that electric-motor drive unit is used for exporting according to main control unit drives the running of direct current machine permanent torque; Low voltage converter, is connected between external power source and main control unit; High-voltage converter, is connected between external power source and electric-motor drive unit.Air quantity electrodeless variable-speed and energy efficient is realized by adopting direct current machine.
Description
Technical field
The present invention relates to a kind of lampblack absorber, particularly a kind of lampblack absorber adopting direct current variable frequency motor.
Background technology
Along with the development of technology, the developing direction of current motor is mainly towards green, low-carbon (LC), low noise future development, and especially converter technique has become the trend of household electric appliances.But the variable-frequency motor at present on lampblack absorber market mostly is AC frequency conversion, because alternating-current variable frequency motor needs external excitation, excitation loss is high, cause following problem thus, current alternating current machine major part is third gear speed governing, cannot meet user and select suitable rotating speed, such as cook congee or Baoshang etc. does not need motor higher rotation speed, then cause unnecessary waste.Nowadays the energy-conservation developing direction having become following household electrical appliances, smoke exhaust ventilator also belongs to the electrical equipment that all will use every day in family, although each service time is not long, because the alternating current machine efficiency used at present is too low, energy consumption is still very large.
Summary of the invention
In view of this, main purpose of the present invention is, provides a kind of lampblack absorber, realizes air quantity electrodeless variable-speed and energy efficient by adopting direct current machine.
Lampblack absorber provided by the present invention comprises:
The direct current machine that closed loop connects, direct-current machine counter electromotive detecting unit, main control unit and electric-motor drive unit; Main control unit is used for the back electromotive force of the direct current machine detected according to direct-current machine counter electromotive detecting unit, the duty ratio of regulation output; The duty ratio that electric-motor drive unit is used for exporting according to main control unit drives the running of direct current machine permanent torque;
Low voltage converter, is connected between external power source and main control unit;
High-voltage converter, is connected between external power source and electric-motor drive unit.
By upper, realize air quantity electrodeless variable-speed and energy efficient by adopting direct current machine.
Optionally, described electric-motor drive unit is the circuit comprising insulated gate bipolar transistor.
Optionally, also comprise control panel, be connected with main control unit.
By upper, be convenient to user carry out Non-follow control by arranging control panel.
Optionally, also comprise air curtain motor, be connected with main control unit.
Optionally, described direct current machine is three-phase direct-current brushless motor, and its rotor adopts the rotor of surface-mount type permanent magnetic material.
By upper, by selecting DC brushless motor, compared to AC induction motor, realize energy-conservation.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of lampblack absorber;
Fig. 2 is the equivalent circuit diagram of electric-motor drive unit;
Fig. 3 is DC motor stator structural representation;
Fig. 4 is the oscillogram of direct-current machine counter electromotive;
Fig. 5 is the partial circuit figure of lampblack absorber.
Embodiment
Below in conjunction with accompanying drawing 1-5, lampblack absorber of the present invention is described.As shown in Figure 1, lampblack absorber comprises the low voltage converter 11 and high-voltage converter 12 that are connected with external power source 10; The main control unit 13 be connected with low voltage converter 11; The air curtain motor 16 be connected with main control unit 13, control panel 17, indicator light 18 and electric-motor drive unit 14, and the direct current machine 15 be connected with electric-motor drive unit 14.
Described low voltage converter 11 is for by outside 220V voltage transitions being the low-voltage driving main control unit 13 to work.As shown in Figure 5, the function of described low voltage converter 11 is by the circuit realiration comprising M51995 chip.Wherein, between the DSPIC30F3010 chip in described M51995 chip and hereinafter described main control unit 13, be sequentially connected in series resistance R1 ~ R5, described resistance R5 is sampling resistor, for gathering P+ voltage.
High-voltage converter 12 is connected between external power source 10 and electric-motor drive unit 14, for being the high voltage that drive motors driver element 14 works by outside 220V voltage transitions.In the present embodiment, the operating voltage of electric-motor drive unit 14 is 310V.
The power supply port of main control unit 13 is connected with low voltage converter 11, data transmission port is connected with hereinafter described direct-current machine counter electromotive detecting unit 19, control port is connected with electric-motor drive unit 14, the back electromotive force of the direct current machine 15 that described main control unit 13 detects for foundation direct-current machine counter electromotive detecting unit 19, control the electric current of adjustment electric-motor drive unit 14, and then the rotating speed of adjustment direct current machine 15.Concrete control procedure is described later.As shown in Figure 5, the function of described main control unit 13 is by the circuit realiration comprising DSPIC30F3010 chip.
In addition, main control unit 13 also by receiving the control command of user by control panel 17, exports the rotating speed that control signal regulates air curtain motor 16.Accordingly, main control unit 13 is according to open and close controlling indicator light 18 secretly bright of control command and lampblack absorber.
Electric-motor drive unit 14 is connected between main control unit 13 and direct current machine 15, for receiving the control command of main control unit 13, drives the running of direct current machine 15.The function of described electric-motor drive unit 14 is realized by insulated gate bipolar transistor (IGBT, InsulatedGateBipolarTransistor) module, is illustrated in figure 2 the equivalent circuit diagram of IGBT module.The drive principle of IGBT module is: the control signal that main control unit 13 exports is exported by control port (PWM port), analog-to-digital conversion is carried out through analog to digital conversion circuit (not shown), and enter electric-motor drive unit 14 after PI computing circuit (not shown) control algorithm, triggering electric-motor drive unit 14, changing the output current of electric-motor drive unit 14 by changing ON time.Wherein, when applying positive voltage between the grid G and emitter E of electric-motor drive unit 14, then between the collector electrode C of PNP transistor and base stage B in low resistive state, make electric-motor drive unit 14 conducting.Otherwise, if add reverse swing door pole tension to eliminate raceway groove between grid G and emitter E, cut off base stage B electric current, electric-motor drive unit 14 turned off.
Direct current machine 15 is connected with electric-motor drive unit 14.In the present embodiment, direct current machine 15 adopts three-phase direct-current brushless motor.As shown in Figure 3, the stator winding of direct current machine 15 is 3 mutually centralized, and the common port of three-phase windings (U, V and W) connects together, and 3 leading-out terminals are drawn by wire harness.Rotor adopts the rotor of surface-mount type permanent magnetic material.By selecting DC brushless motor to realize soft start, the operating condition of balance eliminates the noise produced when range hood starts.In addition, the energy-conservation space of direct current machine is very large, and by test, under identical Wind Volume, AC induction motor needs the input power of 180W, and direct current machine only needs about 120W; Under identical little air quantity, AC induction motor needs the input power of 100W, and direct current machine only needs about 30W; By comparing, direct current machine exceeds more than 30% than AC induction motor in efficiency.
Preferably, in the present embodiment, also comprise direct-current machine counter electromotive detecting unit 19, be connected with direct current machine 15, for detecting the back electromotive force of direct current machine 15.
Wherein, described direct-current machine counter electromotive detecting unit 19 is for detecting the back electromotive force of direct current machine 15.According to galvanomagnetic effect principle, the rotor of direct current machine 15 can produce electromotive force in the stator coils in rotary course, and this electromotive force is called back electromotive force (BEMF, BackEMF).Be illustrated in figure 4 the oscillogram of direct current machine 15 back electromotive force that direct-current machine counter electromotive detecting unit 19 gathers, adopt 120 ° of type of drive in the present embodiment, this oscillogram is sinusoidal wave, reflects the data such as the cycle of back electromotive force, amplitude and phase place.Direct-current machine counter electromotive detecting unit 19 is by above-mentioned transfer of data to main control unit 13, and main control unit 13 just can calculate rotor-position according to back electromotive force.Operationally, every phase winding all can produce induced electromotive force to three-phase brushless DC motor, and direct current machine 15 often turns 60 ° just needs commutation once, so the induction electric important and influential persons being truncated certain phase winding of electric current is before this anti-phase, thus passes through zero point.Direct current machine 15 is often gone around needs commutation 6 times, so three-phase windings is often gone around have 6 zero crossings, often has 2 zero crossings mutually.After direct-current machine counter electromotive detecting unit 19 detects the moment of certain phase (U, V or W) zero crossing, postponed 30 ° and just can be obtained required commutation signal.Main control unit 13 realizes position probing according to this principle.The back electromotive force that main control unit 13 is detected by direct-current machine counter electromotive detecting unit 19 calculates rotor-position, three hall position sensors on general brshless DC motor can be saved thus, thus realize decreasing motor cost and eliminate the high failure rate that hall position sensor produces under lampblack absorber hot environment simultaneously.As shown in Figure 5, the function of described direct-current machine counter electromotive detecting unit 19 is by the circuit realiration comprising ST72141 chip.
The back electromotive force of the direct current machine 15 that main control unit 13 detects according to direct-current machine counter electromotive detecting unit 19, by regulating the work of Duty ratio control direct current machine 15 permanent torque.The situation crashed regulates to prevent motor from may occur in test process.Specifically: in lampblack absorber test process, first duct outlet is set to closed state, now the exhaust air rate of lampblack absorber is close to zero, and the rotating speed of direct current machine 15 is higher in this state, and its actual power is very low.Back electromotive force received by main control unit 13 is relatively large, is therefore ensureing under the prerequisite that direct current machine 15 nominal torque is constant, exports by changing duty ratio the normal speed and rated power increase that control direct current machine 15; When the blast in air channel acquires a certain degree; open the exhaust outlet in air channel; now the power of direct current machine 15 improves suddenly; the back electromotive force that main control unit 13 receives reduces; main control unit 13 exports by changing duty ratio the normal speed and rated power reduction that control direct current machine 15; to avoid, because power increases suddenly, reaching overcurrent protection current point, direct current machine 15 cannot bear such high load capacity and cause burn-down of electric motor.
In addition, when air channel ventilation state is for blocking or when starting a leak, namely air displacement cannot reach standard-required, then main control unit 13 is by changing duty ratio and export the normal speed that controls direct current machine 15 and rated power increasing, to carry out air quantity compensation, meet user's requirement.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, in a word, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. a lampblack absorber, comprises low voltage converter (11) and high-voltage converter (12), it is characterized in that, also comprise:
The direct current machine (15) that closed loop connects, direct-current machine counter electromotive detecting unit (19), the main control unit (13) be connected with low voltage converter (11) and the electric-motor drive unit (14) be connected with high-voltage converter (12);
Main control unit (13), for the back electromotive force of the direct current machine (15) that foundation direct-current machine counter electromotive detecting unit (19) detects, the duty ratio of regulation output is to control the running of direct current machine (15) permanent torque, when back electromotive force is large, the normal speed and the rated power that control direct current machine (15) increase, back electromotive force hour, the normal speed and the rated power that control direct current machine (15) reduce; Electric-motor drive unit (14) drives the running of direct current machine (15) permanent torque for the duty ratio exported according to main control unit (13);
Low voltage converter (11), for by outside 220V voltage transitions being the low-voltage driving main control unit (13) to work;
High-voltage converter (12), is connected between external power source and described electric-motor drive unit (14), for by outside 220V voltage transitions being the high voltage driving described electric-motor drive unit (14) to work.
2. lampblack absorber according to claim 1, is characterized in that, described electric-motor drive unit (14) is the circuit comprising insulated gate bipolar transistor.
3. lampblack absorber according to claim 1, is characterized in that, also comprises control panel (17), is connected with main control unit (13).
4. lampblack absorber according to claim 1, is characterized in that, also comprises:
Air curtain motor (16), is connected with main control unit (13).
5. lampblack absorber according to claim 1, is characterized in that, described direct current machine (15) is three-phase direct-current brushless motor, and its rotor adopts the rotor of surface-mount type permanent magnetic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210129141.4A CN102664570B (en) | 2012-04-27 | 2012-04-27 | Lampblack absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210129141.4A CN102664570B (en) | 2012-04-27 | 2012-04-27 | Lampblack absorber |
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| Publication Number | Publication Date |
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| CN102664570A CN102664570A (en) | 2012-09-12 |
| CN102664570B true CN102664570B (en) | 2016-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210129141.4A Active CN102664570B (en) | 2012-04-27 | 2012-04-27 | Lampblack absorber |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103836691B (en) * | 2014-02-28 | 2018-03-30 | 广东威灵电机制造有限公司 | Lampblack absorber and its constant wind quantity adjusting method and system |
| CN103968436B (en) * | 2014-04-24 | 2017-07-04 | 广东威灵电机制造有限公司 | A kind of smoke exhaust ventilator permanent wind amount and permanent rotating speed method for handover control and its system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201310979Y (en) * | 2008-12-12 | 2009-09-16 | 浙江帅康电气股份有限公司 | Frequency-conversion controlled stepless speed-regulating range hood |
| CN102032610A (en) * | 2010-12-07 | 2011-04-27 | 广东万家乐燃气具有限公司 | Direct current frequency-variable stepless speed regulation range hood |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004153976A (en) * | 2002-11-01 | 2004-05-27 | Hitachi Home & Life Solutions Inc | Drive device for brushless motor |
| JP5167657B2 (en) * | 2007-03-06 | 2013-03-21 | パナソニック株式会社 | Brushless DC motor drive device and ventilation blower equipped with the drive device |
| CN202613547U (en) * | 2012-04-27 | 2012-12-19 | 海尔集团公司 | Range hood |
-
2012
- 2012-04-27 CN CN201210129141.4A patent/CN102664570B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201310979Y (en) * | 2008-12-12 | 2009-09-16 | 浙江帅康电气股份有限公司 | Frequency-conversion controlled stepless speed-regulating range hood |
| CN102032610A (en) * | 2010-12-07 | 2011-04-27 | 广东万家乐燃气具有限公司 | Direct current frequency-variable stepless speed regulation range hood |
Non-Patent Citations (1)
| Title |
|---|
| 无刷直流电机调速控制系统;于硕君;《中国优秀硕士论文全文数据库》;20110715;第18-20页 * |
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