CN102201767A - Motor device and fan using same - Google Patents
Motor device and fan using same Download PDFInfo
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- CN102201767A CN102201767A CN2010101687249A CN201010168724A CN102201767A CN 102201767 A CN102201767 A CN 102201767A CN 2010101687249 A CN2010101687249 A CN 2010101687249A CN 201010168724 A CN201010168724 A CN 201010168724A CN 102201767 A CN102201767 A CN 102201767A
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Abstract
The embodiment of the invention relates to motor technologies and discloses a motor device and a fan using the same. The motor device comprises a brushless DC (direct current) motor and a control device for controlling the brushless DC motor; the control device comprises a reduction voltage unit, a converting unit and a drive unit, wherein the reduction voltage unit is used for reducing the voltage of an AC (alternating current) power supply and provided with a reduction voltage capacitance device with adjustable capacitance capacity; the converting unit is used for converting the AC power supply of which the voltage is reduced into a DC power supply; and the voltage from the DC power supply supplies power for the drive unit and the drive unit is used for carrying out commutation on the brushless DC motor. The motor device in the embodiment of the invention realizes that the brushless DC motor is driven by the AC power supply and the motor speed can be adjusted; and the motor device has the advantages of simple circuit and lower cost.
Description
Technical field
The present invention relates to motor technology, relate in particular to the control technology of dc brushless motor.
Background technology
For household electrical appliance (as fan etc.) by driven by Brush-Less DC motor, owing to be to adopt the civil power AC-powered, it is direct current to the step-down of civil power alternating current, the rectifier AC rectification after with step-down that the control device of motor generally includes a dropping equipment, and the commutation that is used to carry out motor by the electronic commutation circuit of this powered by direct current.In the application of adjustable speed, comprise that also an alignment circuit is to finish the speed governing of motor usually in the control device.
The present invention aims to provide a kind of adjustable speed dc brushless motor device by ac power supply that reduces cost.
Summary of the invention
The invention provides a kind of electric machine, comprise dc brushless motor and the control device that is used to control described dc brushless motor; Described control device comprises: pressure unit is used for AC power is carried out step-down; Described pressure unit has the decompression capacitor device of capacitance adjustable size; Converting unit is used for the AC power after the step-down is converted to DC power supply; Driver element by the power voltage supply that is derived from described DC power supply, is used to carry out the commutation of described dc brushless motor.
Optionally, described decompression capacitor device comprises selected cell and at least two electric capacity, and described selected cell is used for selecting the part or all of electric capacity of described at least two electric capacity to be in effective operating state.
Optionally, described driver element comprises: position detection unit, be used for the position of the rotor of the described dc brushless motor of perception, and export corresponding position signalling; Control unit is used to respond described position signalling, the corresponding commutation of output control signal; Reversing unit is used to respond described commutation control signal, carries out described dc brushless motor commutation.
Optionally, described control device also comprises the Overvoltage protecting unit that is used for the DC power supply of described converting unit output is carried out overvoltage protection.
Optionally, described Overvoltage protecting unit comprises: detecting unit, be used to detect the magnitude of voltage of the DC power supply of described converting unit output, and whether output expression DC power supply the detection signal of overvoltage; Protected location is used to respond described detection signal, carries out overvoltage protection or closes overvoltage protection described DC power supply is corresponding.
Illustrated embodiment of the present invention has following beneficial effect: the electric machine of the embodiment of the invention drives dc brushless motor with AC power, motor speed is adjustable, owing to adopt the decompression capacitor device of capacitance adjustable size to carry out step-down and finish speed governing, therefore have simple, the lower-cost advantage of circuit.Further, owing to be provided with Overvoltage protecting unit in electric machine, can improve the reliability of circuit, in addition, the element of driver element can be selected the lower element of voltage withstand class for use, also can further reduce cost.
In order further to understand feature of the present invention and technology contents, see also following about detailed description of the present invention and accompanying drawing, yet institute's accompanying drawing only provide with reference to and the explanation usefulness, be not to be used for the present invention is limited.
Description of drawings
Fig. 1 is the structure chart of the electric machine of one embodiment of the invention;
Fig. 2 is the structure chart of the electric machine of another embodiment of the present invention;
Fig. 3 is the schematic diagram of pressure unit in the electric machine of Fig. 2.
Embodiment
Below in conjunction with accompanying drawing,, will make technical scheme of the present invention and other beneficial effects apparent by the specific embodiment of the present invention is described in detail.
Consult Fig. 1, the electric machine 100 that one embodiment of the invention provides comprises dc brushless motor 102 and the control device 104 that is used to control described dc brushless motor; Control device 104 further comprises: pressure unit 120, be used for AC power 106 is carried out step-down, and described pressure unit has the decompression capacitor device of capacitance adjustable size; Converting unit 140 is used for the AC power after the step-down is converted to DC power supply; Driver element 160 by the power voltage supply that is derived from described DC power supply, is used to carry out the commutation of described dc brushless motor.
See also Fig. 2, the electric machine 200 of another embodiment of the present invention comprises dc brushless motor and is used to control the control device 204 of dc brushless motor.Electric machine is by AC power 206 power supplies.Dc brushless motor can be the single-phase DC brushless electric machine for example, comprises stator and rotor, is equiped with winding 208 on the stator, and rotor becomes magnetic coupling relation with stator.Control device 204 comprises pressure unit 220, converting unit 240, driver element 260 and low-tension supply generation unit 280:
See also Fig. 3, pressure unit 220 comprises decompression capacitor device 222.Decompression capacitor device 222 comprises that two terminals are connected with converting unit 240 with AC power 206 respectively, selected cell 226 and n electric capacity 228, and n is the integer greater than 1.Selected cell 226 can be to control the switching device whether n electric capacity is connected respectively, for example can be respectively with n switch element 221 of n capacitances in series, each switch element forms a switching capacity group with the electric capacity of being connected, and n switching capacity group is parallel to two terminals.During the switch element conducting, Dui Ying electric capacity is switched in circuit with it, promptly this electric capacity is in effective operating state, when switch element disconnects, Dui Ying electric capacity is disconnected in circuit with it, therefore, and the conducting or the disconnection of n switch element of control, promptly can control n electric capacity respectively and whether in circuit, be switched on separately, thus the capacitance of control decompression capacitor device 222.Understandable, except above-mentioned example, the decompression capacitor device also can adopt other modes to realize, for example can be can control n electric capacity to have independent component of different getting types etc.Pressure unit can comprise that further resistor is in parallel with decompression capacitor device 222, the electric charge of the decompression capacitor device 222 that is used for releasing behind switching off AC power 206.
Converting unit 240 can comprise rectifier 242 and filter 244, and it is DC power supply that rectifier 242 is used for the AC power rectification, and filter 244 is used for the DC power supply of rectifier 242 outputs is carried out filtering.Preferably, rectifier is a bridge rectifier, and filter is to be connected to the positive output end of bridge rectifier and the capacitor of ground level.Understandable, except above-mentioned example, converting unit 240 also can adopt other modes that AC power can be converted to DC power supply to realize that for example, rectifier also can adopt full-wave rectifying circuit realization etc.
Low-tension supply generation unit 280 is used for producing a stable low-voltage dc power supply from the high-voltage DC power supply of filter 244 outputs, for example can form by resistance and Zener diode, one end of this resistance is connected with the positive output end of bridge rectifier, the other end is connected with the negative electrode of Zener diode, and the anode of Zener diode is connected with ground; Further, the low-tension supply generation unit can also comprise the filter capacitor in parallel with Zener diode, thereby in the stabilizing low voltage DC power supply of the negative electrode of Zener diode output through filtering.
Further, control device 204 also comprises Overvoltage protecting unit 290, is used for the DC power supply of converting unit 240 outputs is carried out overvoltage protection, to avoid damaging the electronic device by this DC power supply.Overvoltage protecting unit 290 comprises detecting unit 292 and protected location 294, and detecting unit 292 is used to detect the magnitude of voltage of the DC power supply of converting unit 240 outputs, and whether output expression DC power supply the detection signal of overvoltage; Protected location 294 is used to respond this detection signal, carries out overvoltage protection or closes overvoltage protection described DC power supply is corresponding.Those skilled in the art can understand that above-mentioned detecting unit and protected location can be realized, repeated no more in the design of routine techniques means herein.
In the embodiment of the invention, converting unit 240, driver element 260, Overvoltage protecting unit 290 and low-tension supply generation unit 280 can be integrated on the printed circuit board, and pressure unit 220 is the independent community that electrical connection is arranged with described circuit board.
In the embodiment of the invention, have different capacitances, can make the DC power supply of converting unit 240 outputs have different voltage, and then make rotor have different rotating speeds by control decompression capacitor device 222.Particularly, when the capacitance of the electric capacity of the n in the decompression capacitor device is different,, can provide 2 at most by the various combination of electric capacity
N-1Plant motor speed.
Illustrated embodiment of the present invention has following beneficial effect: the electric machine of the embodiment of the invention drives dc brushless motor with AC power, motor speed is adjustable, owing to adopt the decompression capacitor device of capacitance adjustable size to carry out step-down and finish speed governing, therefore have simple, the lower-cost advantage of circuit.Further, owing to be provided with Overvoltage protecting unit in electric machine, can improve the reliability of circuit, in addition, the element of electric-motor drive unit can be selected the lower element of voltage withstand class for use, also can further reduce cost.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. an electric machine is characterized in that, comprises dc brushless motor and the control device that is used to control described dc brushless motor; Described control device comprises:
Pressure unit is used for AC power is carried out step-down; Described pressure unit has the decompression capacitor device of capacitance adjustable size;
Converting unit is used for the AC power after the step-down is converted to DC power supply;
Driver element by the power voltage supply that is derived from described DC power supply, is used to carry out the commutation of described dc brushless motor.
2. electric machine according to claim 1 is characterized in that, described decompression capacitor device comprises selected cell and at least two electric capacity, and described selected cell is used for selecting the part or all of electric capacity of described at least two electric capacity to be in effective operating state.
3. electric machine according to claim 1 is characterized in that, described driver element comprises:
Position detection unit is used for the position of the rotor of the described dc brushless motor of perception, exports corresponding position signalling;
Control unit is used to respond described position signalling, the corresponding commutation of output control signal;
Reversing unit is used to respond described commutation control signal, carries out the commutation of described dc brushless motor.
4. electric machine according to claim 3 is characterized in that, described reversing unit is the bridge-type commutating circuit.
5. electric machine according to claim 1 is characterized in that, described converting unit comprises that it is that a DC power supply and a filter are used for the DC power supply of rectifier output is carried out filtering that a rectifier is used for the AC power rectification.
6. electric machine according to claim 5 is characterized in that, described rectifier is a bridge rectifier.
7. electric machine according to claim 3, it is characterized in that, described control device also comprises the low-tension supply generation unit, is used for producing a low-voltage dc power supply from the DC power supply of described converting unit output, to power to described position detection unit and control unit.
8. electric machine according to claim 1 is characterized in that, described control device also comprises the Overvoltage protecting unit that is used for the DC power supply of described converting unit output is carried out overvoltage protection.
9. electric machine according to claim 8 is characterized in that, described Overvoltage protecting unit comprises:
Detecting unit is used to detect the magnitude of voltage of the DC power supply of described converting unit output, and whether output expression DC power supply the detection signal of overvoltage;
Protected location is used to respond described detection signal, carries out overvoltage protection or closes overvoltage protection described DC power supply is corresponding.
10. electric machine according to claim 2 is characterized in that, described converting unit and driver element are integrated on the printed circuit board, and described pressure unit is the independent community that electrical connection is arranged with described circuit board.
11. a fan is characterized in that, described fan has as each described electric machine of claim 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101687249A CN102201767A (en) | 2010-03-26 | 2010-04-26 | Motor device and fan using same |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010138043 | 2010-03-26 | ||
| CN201010138043.8 | 2010-03-26 | ||
| CN2010101687249A CN102201767A (en) | 2010-03-26 | 2010-04-26 | Motor device and fan using same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102201767A true CN102201767A (en) | 2011-09-28 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101687249A Pending CN102201767A (en) | 2010-03-26 | 2010-04-26 | Motor device and fan using same |
| CN2010102861721A Pending CN102201743A (en) | 2010-03-26 | 2010-09-01 | Motor device, fan and power circuit |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102861721A Pending CN102201743A (en) | 2010-03-26 | 2010-09-01 | Motor device, fan and power circuit |
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| Country | Link |
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| CN (2) | CN102201767A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102297148A (en) * | 2011-08-23 | 2011-12-28 | 广东金莱特电器股份有限公司 | Fan control circuit for prolonging service life of direct current carbon brush motor of fan |
| CN102352853A (en) * | 2011-10-18 | 2012-02-15 | 佛山市顺德区大洋彩虹电器有限公司 | Electric fan adopting brushless direct-current motor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111726016B (en) * | 2020-06-10 | 2022-03-04 | 合肥美的智能科技有限公司 | Isolating device and storage cabinet |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1350176A (en) * | 1972-07-21 | 1974-04-18 | Okikiolu G O | Capacitor and resistor arrangements for selected power output units |
| US4525651A (en) * | 1982-05-18 | 1985-06-25 | General Electric Company | Capacitively ballasted low voltage incandescent lamp |
| FR2851118B1 (en) * | 2003-02-12 | 2005-09-30 | Fd Eclairage Architectural | VERY LOW VOLTAGE LAMP POWER SUPPLY INSTALLATION |
| CN2643542Y (en) * | 2003-07-11 | 2004-09-22 | 元山科技工业股份有限公司 | Power source control circuit device for DC brushless fan motor |
| CN101188400A (en) * | 2007-12-13 | 2008-05-28 | 佛山市顺德区泛仕达机电有限公司 | A novel AC electromotor voltage reduction speed-adjusting circuit |
-
2010
- 2010-04-26 CN CN2010101687249A patent/CN102201767A/en active Pending
- 2010-09-01 CN CN2010102861721A patent/CN102201743A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102297148A (en) * | 2011-08-23 | 2011-12-28 | 广东金莱特电器股份有限公司 | Fan control circuit for prolonging service life of direct current carbon brush motor of fan |
| CN102297148B (en) * | 2011-08-23 | 2012-11-28 | 广东金莱特电器股份有限公司 | Fan control circuit for prolonging service life of direct current carbon brush motor of fan |
| CN102352853A (en) * | 2011-10-18 | 2012-02-15 | 佛山市顺德区大洋彩虹电器有限公司 | Electric fan adopting brushless direct-current motor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102201743A (en) | 2011-09-28 |
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Application publication date: 20110928 |