CN105071721B - A kind of low-power ventilating fan of small permanent magnetic sychronous motor direct drive - Google Patents
A kind of low-power ventilating fan of small permanent magnetic sychronous motor direct drive Download PDFInfo
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Abstract
A kind of low-power ventilating fan of small permanent magnetic sychronous motor direct drive, the width that the motor includes air gap between stator and p-m rotor, stator and rotor is narrowed in each pole lower edge setting circumferencial direction；Stator winding have regulation around to, through switch be access to AC power；Circuit is controlled to include detection circuit and plug-in；Plug-in contains by the signal driving switch detected with the starting control step for the electric current for controlling AC power to input winding：A) ON switch, makes 1 half-wave voltage of institute's AC power put on winding by the regulation angle of flow, and detect the electric current therefore produced in winding；If b) electric current meets regulation, switch is persistently connected by AC mains cycle with the regulation angle of flow immediately, and motor enters synchronous operation；Otherwise, after the time that one is enough to make rotor reliably stop, said process is repeated since step a).The complexity of design reduction control program and the requirement to component and circuit, cost is reduced and properties of product are more stable.
Description
Technical field
The present invention relates to a kind of low-power ventilating fan of small permanent magnetic sychronous motor direct drive, more particularly to its machinery
The cooperation of structure, electromagnetic structure and control method；In International Patent Classification (IPC), classification belongs to F04D 25/08.
Background technology
Ventilation fan is using having a large capacity and a wide range, and long operational time needs manufacture low cost and energy saving in running badly.It is current for ventilation fan
Using Asynchronous Motor Driving so that the relatively low situation of efficiency, the authorized earlier application of the applicant
The low-power ventilating fan that CN201110303632.1 is proposed is connect driving by permasyn motor direct and saved and small volume, and
Have on predetermined direction of rotation and preferably start and behavior in service, cost is relatively low, but the motor needs to set and individually turned
Sub- position detecting element.
The content of the invention
The technical problems to be solved by the invention are to propose a kind of ventilation fan, can be direct by small permanent magnetic sychronous motor
Driving and save and small volume, and have on predetermined direction of rotation and preferably to start and behavior in service, but need not can set
Single rotor-position detecting element is put, thus reduces cost.
The technical scheme that the present invention solves the technical problem is that it is small that a kind of small permanent magnetic sychronous motor directly drives
Power ventilation fan, including：
--- the impeller rotated according to predetermined direction, it is axial-flow type and injection molding；
--- the motor of the direct drive impeller, the number of poles of motor stator is 4 poles or 6 poles or 8 poles, stator around
Group is by regulation around to being access to AC power；Motor rotor is p-m rotor, and its number of poles is identical with the number of poles of stator；The stator
The width of air gap is narrowed in the direction of rotation that each pole lower edge is set between rotor, thus in a free state, each pole of rotor
Axis deflects a sharp angle using the axis of the hithermost pole of stator one as reference along the direction of rotation of setting；
--- with one switch, AC power through winding power from the switch to motor stator；
--- with a control circuit, switched on-off described in control；
It is characterized in that：
--- the number of poles of motor stator is 4 poles, and impeller diameter is not more than 100mm；Or the number of poles of motor stator is 6
Pole, impeller diameter is not more than 130mm；Or the number of poles of motor stator is 8 poles, impeller diameter is not more than 150mm；
--- control circuit；Including detection circuit and plug-in, the plug-in contains drives institute by the signal detected
Switch is stated with the starting control step for the electric current for controlling the AC power input winding；The step includes：
A) switch is connected, described 1 half-wave voltage of AC power is put on the winding by the regulation angle of flow, and
The electric current that therefore detection produces in the winding；
If b) electric current meets regulation, the switch is immediately persistently by the AC mains cycle and regulation conducting corner connection
Logical, motor enters synchronous operation；Otherwise, after the time that one is enough to make the rotor reliably stop, the weight since step a)
Multiple said process.
The opposite direction that the starting of permasyn morot can be designed in main flux axis intersects with permanent magnet flux axis is
AC power half-wave now is connected during the sharp angle, rotor magnetic pole is revolved with its hithermost magnetic pole of the stator along setting
Turn direction repulsion, thus motor is started by the direction of rotation of setting, this is exactly required for impeller for air exchange fan.If now changing
To connect the AC power half-wave of opposite polarity, the direction of main flux axis is to adjust anti-, directly intersects with permanent magnet flux axis and is
The sharp angle, rotor magnetic pole is to be changed to be inhaled by the opposite direction with its hithermost magnetic pole of the stator along setting direction of rotation
Draw, thus motor is started by the opposite direction of the direction of rotation of setting, this is not permitted in impeller for air exchange fan.To above-mentioned
Situation, the technical program be based on ferromagnetic saturation principle, dexterously find and using permanent magnet flux it is identical with main flux direction when pair
Iron circuit, which increases magnetic, declines motor inductance so that electric current increases with otherwise then electric current reduces the phenomenon, is sentenced with this current difference
Disconnected, adjustment motor pulls in the SBR of operation, reaches the necessary directional starting of the impeller of motor and its driving, because
And single rotor-position detecting element need not can be set, thus reduce cost.
Especially, the technical program reduces the complexity of prior art such ventilator motor starting control program and right
The fast-response energy of component and the EMC Requirements of circuit arrangement, thus cost is reduced and properties of product are more stable.
The technical program " electric current meets regulation " is judged i.e. based on " current difference " by on-line checking
Or the setting determined with experiment statisticses judges.For on-line checking, the step is specially：
--- connect the switch make AC power at least two half-wave voltage by the regulation angle of flow put on it is described around
Group, each described half-wave voltage interval one is enough the time for making the rotor reliably stop；Therefore detection produces in the winding
Each electric current, the numerical value of each electric current present obvious size point and after occurring less electric current again, i.e., described electricity
Stream meets regulation, and the switch is persistently connected by the AC mains cycle with the regulation angle of flow immediately, and motor enters synchronous
Operation.
The step is specially further：
The switch is connected, the 1st half-wave voltage of the AC power is put on the winding by the regulation angle of flow, and
The 1st electric current that therefore detection produces in the winding, after the time that one is enough to make the rotor reliably stop, the alternating current
Another 1 half-wave voltage in source puts on the winding by the regulation angle of flow, and detects the 2nd electric current therefore produced in the winding；
If --- the 2nd electric current is significantly less than the 1st electric current, i.e., described electric current meets regulation, and the switch persistently presses institute immediately
State AC mains cycle to connect with the regulation angle of flow, motor enters synchronous operation；
--- otherwise, after the time that one is enough to make the rotor reliably stop, making the AC power 1 half-wave electricity again
Pressure puts on the winding by the regulation angle of flow, and detects the 3rd electric current therefore produced in the winding；
If --- each electric current or the smaller before in each electric current, i.e., described electric current before the 3rd electric current is significantly less than
Meet regulation, the switch is persistently connected by the AC mains cycle with the regulation angle of flow immediately, and motor enters synchronous transport
OK；
--- otherwise, after the time that one is enough to make the rotor reliably stop, making the AC power 1 half-wave electricity again
Pressure puts on the winding by the regulation angle of flow, and detects the 4th electric current therefore produced in the winding；
If --- each electric current or the smaller before in each electric current, i.e., described electric current before the 4th electric current is significantly less than
Meet regulation, the switch is persistently connected by the AC mains cycle with the regulation angle of flow immediately, and motor enters synchronous transport
OK；
..., so repeat, until therefore the winding produce electric current be significantly less than before each electric current or close to it
Smaller in preceding each electric current, i.e., described electric current meets regulation, and the switch persistently presses the AC mains cycle and rule immediately
Determine angle of flow connection, motor enters synchronous operation.
It is controlled with on-line checking, it is possible to decrease the requirement to product and its institute's bringing onto load uniformity.
One of further design of above-mentioned technical proposal is：The electric current is the wink at identical regulation moment in power supply each cycle
Duration, and the regulation moment be desirably no more than the cycle of AC power 1/8.Rotor is generally connect due to its inertia in the switch
It is not significantly changed position after logical in the cycle short time of AC power 1/8, thus keeps to iron circuit saturation so that electric current
The influence of difference, and can have faster response, preferably implement the directional starting control of ventilation fan.
The two of the further design of above-mentioned technical proposal are：Each AC power half-wave voltage is same polarity.This sets
In respect of beneficial to the influence for avoiding rotor magnetic pole uniformity.
Technical scheme and effect will be further described with reference to accompanying drawing in a specific embodiment.
Brief description of the drawings
Fig. 1 is ventilation fan motor electromagnetism basic structure schematic diagram of the embodiment of the present invention；
Fig. 2 is ventilation fan electromotor control circuit schematic diagram of the embodiment of the present invention；
Fig. 3 is that ventilation fan motor of the embodiment of the present invention a, c start situation signal waveform schematic diagram；
Fig. 4 is that ventilation fan motor of the embodiment of the present invention d, b start situation signal waveform schematic diagram；
Fig. 5 is that ventilation fan motor of embodiment of the present invention e starts situation signal waveform schematic diagram.
Fig. 6 is the main Visual figures of the basic mechanical structure of ventilation fan of the embodiment of the present invention.
Embodiment
Ventilation fan of the embodiment of the present invention is described in the authorized earlier application CN201110303632.1 of the applicant
Improve and form on the basis of embodiment.
The basic mechanical structure of ventilation fan of the embodiment of the present invention is as shown in fig. 6, it inherits Fig. 1 institutes in CN201110303632.1
Show that structure includes：
--- it is fixed on the motor 2 of casing；
--- the aial flow impeller 1 of the motor output shaft rotate counterclockwise is directly connected in, it has 4 blades；Press
Blast requirement, the number of blade can also be 3,5 or 6, but had better not be more than 8, and be as far as possible odd number piece, be made an uproar with reducing vibration
Sound.Impeller is injection molding, diameter 100mm.Impeller should not be bigger, and rotary inertia is preferably as far as possible small, to coordinate motor 2 still less
Big staring torque；
--- motor 2 is inner rotor motor, including stator 100 and p-m rotor 200.
The motor electromagnetism basic structure of ventilation fan of the embodiment of the present invention is as shown in Fig. 2 it is inherited
Structure includes shown in Fig. 2 in CN201110303632.1：
--- rotor 200, is that its section is divided into 4 symmetrical 90 with two orthogonal symmetry axis 4000Sector
And each radial magnetizing is N, S, N, S 4 pole p-m rotors；
--- stator 100 is made up of circular iron core 101 and winding 12 with 4 salient poles；Winding 12 is each in 4 salient poles
Around a coil part with Insulating frame, then by around to being connected in series as 4 poles, and thus produce wearing for 4 poles when being powered
The main flux of air gap more between rotor；
--- gradual change is narrowed the width of air gap in the counterclockwise direction between each salient pole of stator core 101 and rotor 200；Therefore exist
Free state be no power and without outer gas stream and rotational structure it is good in the case of, rotor 200 is attracted by stator core, respectively
The geometrical axis of pole is the permanent magnet flux axis 700,800 for passing through air gap between rotor respectively with the geometry of adjacent stators salient pole
Axis is that to pass through the main flux axis 500,600 of air gap between rotor be reference, one is deflected in the counterclockwise direction less sharp
Angle Ω.It is 5 that the present embodiment, which designs the mechanical angle,0(electrical angle 100).The angle can change with the ratio that gradual change is narrowed, and influence
Detent torque and efficiency.The design can avoid in a free state rotor stay in its axis overlapped with the axis of stator salient poles and
Make so-called " dead point " position that detent torque is zero during energization, the reluctance torque formed, which is also helped, prevents the rotor in operating
Torque is not produced when alternating current zero passage and is stalled；
Main variation compared to structure shown in CN201110303632.1 Fig. 2 is：Hall element 300 shown in figure is cancelled.
Ventilation fan of embodiment of the present invention electromotor control circuit is as shown in figure 3, it inherits Fig. 3 in CN201110303632.1
Shown circuit includes：
--- bidirectional thyristor 4, its main electrode is connected with winding 12 to be followed by toward ac power supply terminal 5；
--- single-chip microcomputer 6, its output circuit 63 is access to the trigger electrode 41 of bidirectional thyristor 4, if output pulse is that triggering is brilliant
Brake tube 4 is turned on, and AC power half-wave voltage now is to start to put on input winding 12 until the half-wave zero passage terminates, with this
Voltage synchronous and delayed pulse current input winding 12.
--- the shaping circuit being made up of resistance 7 and diode 8,9 and 5V dc sources VDD, its input is access to exchange
Power supply terminal 5, output B in the polarity of voltage positive half-wave of ac power supply terminal 5 for 1 negative half-wave when be 0, and output B by 1 change
For 0 or i.e. AC supply voltage zero crossing at the time of be changed into 1 from 0.Output B is access to the input circuit 61 of single-chip microcomputer 6, provides it
AC power crossover point signal.
Main variation compared to circuit shown in CN201110303632.1 figures includes：
--- the circuit that former Hall element 300 and its output are access to single-chip microcomputer input is cancelled；
--- the former one end directly connect publicly of winding 12 is changed to connect publicly through resistance 13, the resistance be detect by around
The sample resistance of the electric current of group 12；The converted circuit 621 of tie point of winding 12 and resistance 13 is access to the input circuit of single-chip microcomputer
62, for checking by the electric current of winding 12 in the voltage drop of resistance 13 and with electric current of this determination by winding 12.
Above-mentioned change-over circuit 621 may be designed as isolating clamp circuit：
--- the tested alternating voltage of sampling transformer primary connection, secondary superposition one is higher than tested alternating voltage peak
Single-chip microcomputer is inputted after constant DC voltage, the instantaneous value that can determine that alternating voltage is changed through A/D.Certainly, also it can select containing upper
The chip for stating function and single-chip microcomputer replaces single-chip microcomputer 6 and change-over circuit 621.In addition it is also possible to which current transformer replaces resistance 13
The sampling of the electric current by winding 12 is obtained with sampling transformer, the power consumption of detection circuit can be therefore reduced.
The plug-in of single-chip microcomputer 6 checks the level of input circuit 61,62 essentially according to setting procedure, through measuring, comparing, sentence
Not, the pulse of triggering IGCT 4 is exported by output circuit 63.5 kinds of starting each signal waveforms of situation of motor of the embodiment of the present invention
As shown in Figure 3, Figure 4：
--- 51 be the voltage waveform of ac power supply terminal 5；
--- 52 be the waveform that shaping circuit exports B；
--- 531,532,533 be the waveform for the voltage that corresponding starting situation puts on winding 12；
--- 54a~e is the waveform of the electric current of winding 12；
--- 551,552,553 be the voltage pulse ripple that the output circuit 63 of single-chip microcomputer 6 is exported to the trigger electrode 41 of IGCT 4
Shape.
Cycle when the present embodiment ac power frequency is 50Hz is 20ms, and plug-in includes performing the following steps：
Delay to, the output of single-chip microcomputer 6 are played from the 1st positive zero crossing (voltage becomes just, similarly hereinafter from negative) of AC supply voltage
Circuit 63 is to the output voltage pulse k1 of trigger electrode 41 of IGCT 4, and IGCT 4 turns on, and makes the 1st positive polarity half-wave of AC power
Voltage v1 with (10-t0) ms angles of flow put on winding 12 produce the 1st electric current (refer to electric current a1, b1, c1, d1 in Fig. 3, Fig. 4 and
E1, similarly hereinafter), the 1st electric current is detected, when especially lighting 2ms from the zero passage (it is located in Fig. 3, Fig. 4 at current waveform small circle, under
Instantaneous value together)；
Through 1s, (speed that rotor stops after visual power-off has been adjusted, and to be limited to indicating value in Fig. 3, Fig. 4 more because of map sheet
Times, similarly hereinafter) after, from AC supply voltage, 1 positive zero passage lights delay to, the touching to IGCT 4 of output circuit 63 of single-chip microcomputer 6 again
The output voltage pulse k2 of pole 41 is sent out, IGCT 4 is turned on again, make AC power and 1 positive polarity half-wave voltage v2 is with (10-t0)
The ms angles of flow put on winding 12 and produce the 2nd electric current (referring to electric current a2, b2, c2, d2 and e2 in Fig. 3, Fig. 4, similarly hereinafter), detection electricity
Flow the 2nd electric current, especially its from the zero passage light 2ms when instantaneous value；
Compare the 1st, the 2nd electric current, if the 2nd electric current is significantly less than the 1st electric current, the output circuit 63 of single-chip microcomputer 6 presses alternating current
The source cycle, which continuously exports the voltage pulse kt for lighting delay t2 from each zero passage to the trigger electrode 41 of IGCT 4, continues IGCT 4
Ground is same with defect sine wave (forward position of each half-wave small half of arch of corresponding defect due to delay t2 conductings, similarly hereinafter) conducting
Step voltage vt puts on winding 12 and produces synchronizing current it, and motor enters synchronous operation；
Otherwise, after 1s, from AC supply voltage, 1 positive zero passage lights delay to again, and the output circuit 63 of single-chip microcomputer 6 is to crystalline substance
The output voltage pulse k3 of trigger electrode 41 of brake tube 4, IGCT 4 is turned on again, makes AC power 1 positive polarity half-wave voltage v3 again
Winding 12 is put on (10-t0) ms angles of flow and produces the 3rd electric current (referring to electric current a3, b3, c3 and d3 in Fig. 3, Fig. 4, similarly hereinafter),
Detect the 3rd electric current, especially its from the zero passage light 2ms when instantaneous value；
Compare the electric current of the 1st, the 2nd and the 3rd, if the 3rd electric current is significantly less than the 1st, the 2nd electric current or close to smaller therein,
The output circuit 63 of single-chip microcomputer 6 is continuously exported from each zero passage to the trigger electrode 41 of IGCT 4 by AC mains cycle and lights delay
The synchronizing voltage vt that t2 voltage pulse kt is made IGCT 4 and constantly turned on defect sine wave puts on winding 12 and produces synchronization
Electric current it, motor enters synchronous operation；
Otherwise, after 1s, from AC supply voltage, 1 positive zero passage lights delay to again, and the output circuit 63 of single-chip microcomputer 6 is to crystalline substance
The output voltage pulse k4 of trigger electrode 41 of brake tube 4, IGCT 4 is turned on again, makes AC power 1 positive polarity half-wave voltage v4 again
Winding 12 is put on (10-t0) ms angles of flow and produces the 4th electric current (referring to the electric current a4 and c4 in Fig. 3, similarly hereinafter), the electricity of detection the 4th
Stream, its instantaneous value ... when especially lighting 2ms from the zero passage is so repeated, until obvious in the electric current that the winding is produced
Less than one of each electric current before or close to smaller therein, the output circuit 63 of single-chip microcomputer 6 presses AC mains cycle to brilliant lock
The trigger electrode 41 of pipe 4 continuously exports the voltage pulse kt that delay t2 is lighted from each zero passage, and it is constantly sinusoidal with defect to make IGCT 4
The logical synchronizing voltage vt of waveguide puts on winding 12 and produces synchronizing current it, and motor enters synchronous operation.It is specifically shown in Fig. 3 and figure
Five kinds of starting situations of a~e in 4.
The current signal of a situations sees 54a in Fig. 3：
--- the 2nd electric current a2 being obviously reduced after the 1st electric current a1 is detected, thus is detecting 4th close with a2
After electric current a4 immediately, i.e., apply to winding 12 after 4 half-wave voltages, motor is entered synchronous operation；The output electricity of single-chip microcomputer 6
Road 63 is seen 551 in Fig. 4 to the situation of the output voltage pulse of trigger electrode 41 of IGCT 4.
The current signal of B situations sees 54b in Fig. 4：
--- detect the 3rd electric current b3 being obviously reduced after the 1st electric current b1, the 2nd electric current b2, thus detecting and b3
After the 4th close electric current b4 immediately, i.e., apply to winding 12 after 3 half-wave voltages, motor is entered synchronous operation；Single-chip microcomputer
6 output circuit 63 is seen 552 in Fig. 4 to the situation of the output voltage pulse of trigger electrode 41 of IGCT 4.
The current signal of c situations sees 54c in Fig. 3：
--- it is substantially small to detect 2nd electric current c2s of the 1st electric current c1 than after, thus is detecting 4th close with c1
After electric current c4 immediately, i.e., apply to winding 12 after 4 half-wave voltages, motor is entered synchronous operation；The output electricity of single-chip microcomputer 6
Road 63 is seen 551 in Fig. 4 to the situation of the output voltage pulse of trigger electrode 41 of IGCT 4.
The current signal of d situations sees 54d in Fig. 4：
--- it is substantially small to detect 2nd electric current d2s of the 1st electric current d1 than after, thus is detecting 3rd close with d1
After electric current d3 immediately, i.e., apply to winding 12 after 3 half-wave voltages, motor is entered synchronous operation, the output electricity of single-chip microcomputer 6
Road 63 is seen 552 in Fig. 4 to the situation of the output voltage pulse of trigger electrode 41 of IGCT 4.
The current signal of e situations sees 54e in Fig. 5：
--- the 2nd electric current e2 detected after the 1st electric current e1 is substantially small, thus immediately, i.e., applies 2 half to winding 12
After wave voltage, motor is entered synchronous operation, the output voltage of trigger electrode 41 from the output circuit 63 of single-chip microcomputer 6 to IGCT 4
The situation of pulse is seen 553 in Fig. 5.
" obvious " described above refers to difference more than 30%, and " close " refers to difference within 10%.
There can be following design modification：
--- by experiment, the electric current of " substantially small " that is repeatedly obtained to above-mentioned on-line checking is averaged, and gives one
Fixed tolerance and remembered in single-chip microcomputer, should as the setting of technical solution of the present invention " electric current meets regulation "
Method can reduce the number of above-mentioned input ac power voltage half-wave compared to on-line checking, but can be influenceed by homogeneity of product；
--- when current instantaneous value, which is derived from the zero passage, lights 2ms, delay t0, t2 generally can use 1ms, and concrete numerical value can root
According to adjustment is needed, minimum can use zero, and now the angle of flow is 1800Even if, with complete sine wave shaped voltage；
--- negative polarity half-wave voltage, or positive and negative polarity half-wave voltage can also be used to use with, but mixed meeting is by rotor magnetic
The influence of property uniformity.
Further, it is also possible to there is following design to change：
--- the number of poles of motor stator and rotor may be designed in 6 poles or 8 poles.Because of synchronous rotational speed reduction, the maximum of impeller
Diameter can accordingly increase：Number of poles is 6 poles, and impeller diameter is not more than 130mm；Number of poles is 8 poles, and impeller diameter is not more than 150mm；
If --- ventilation fan be used for directly to outdoor exhaust, be preferably designed as standard GB/T 14806 described in covering and partition type change
Gas is fanned, for example, set the sideboard of wind pressure type, electrodynamic type or linkage type described in the standard in the air stream outlet of ventilation fan casing
Or shutter.The design coordinates motor still less big staring torque, and the sideboard or shutter are operated in ventilation fan
Shi Zhangkai, is closed during stopping, can avoiding the rotor of impeller reversion motor by outside reversely air stream drives before starting, so that open
Dynamic difficulty.
--- impeller is also designed to turn clockwise, and only needs in design according to description before by used term
" counterclockwise " is changed to " clockwise ".
Claims (5)
1. a kind of low-power ventilating fan of small permanent magnetic sychronous motor direct drive, including：
--- the impeller rotated according to predetermined direction, it is axial-flow type and injection molding；
--- the motor of the direct drive impeller, the winding of stator is by regulation around to being access to AC power；Motor rotor
For p-m rotor, its number of poles is identical with the number of poles of stator；The width of air gap is set in each pole lower edge between the stator and rotor
Direction of rotation narrow, thus in a free state, the axis of each pole of rotor using the axis of the hithermost pole of stator one as reference,
A sharp angle is deflected along the direction of rotation of setting；
--- with one switch, AC power through winding power from the switch to motor stator；
--- with a control circuit, switched on-off described in control；
It is characterized in that：
--- the number of poles of motor stator is 4 poles, and impeller diameter is not more than 100mm；Or the number of poles of motor stator is 6 poles,
Impeller diameter is not more than 130mm；Or the number of poles of motor stator is 8 poles, impeller diameter is not more than 150mm；
--- control circuit；Including detection circuit and plug-in, the plug-in contains to be opened as described in the signal driving detected
Close the starting control step of the electric current to control the AC power to input the winding；
The step includes：
A) switch is connected, described 1 half-wave voltage of AC power is put on the winding by the regulation angle of flow, and detect
Therefore the electric current produced in the winding；
If b) electric current meets regulation, the switch is persistently connected by the AC mains cycle with the regulation angle of flow immediately,
Motor enters synchronous operation；Otherwise, after the time that one is enough to make the rotor reliably stop, since step a) in repetition
State process；
The step is specially：
Connecting the switch makes AC power at least two half-wave voltage put on the winding by the regulation angle of flow, described
Each half-wave voltage interval one is enough the time for making the rotor reliably stop；Each electricity that therefore detection produces in the winding
Stream, the numerical value of each electric current present obvious size point and after there is less electric current, i.e., described electric current meets regulation, institute
State switch persistently to connect with the regulation angle of flow by the AC mains cycle immediately, motor enters synchronous operation.
2. according to ventilation fan described in claim 1, it is characterised in that the step is specially further：
The switch is connected, the 1st half-wave voltage of the AC power is put on the winding by the regulation angle of flow, and detect
Therefore the 1st electric current produced in the winding, after the time that one is enough to make the rotor reliably stop, making the AC power
Another 1 half-wave voltage puts on the winding by the regulation angle of flow, and detects the 2nd electric current therefore produced in the winding；
If --- the 2nd electric current is significantly less than the 1st electric current, i.e., described electric current meets regulation, and the switch is persistently handed over as described immediately
Stream power cycle is connected with the regulation angle of flow, and motor enters synchronous operation；
--- otherwise, after the time that one is enough to make the rotor reliably stop, making the AC power again 1 half-wave voltage by
The regulation angle of flow puts on the winding, and detects the 3rd electric current therefore produced in the winding；
If --- each electric current or the smaller before in each electric current before the 3rd electric current is significantly less than, i.e., described electric current meet
Regulation, the switch is persistently connected by the AC mains cycle with the regulation angle of flow immediately, and motor enters synchronous operation；
--- otherwise, after the time that one is enough to make the rotor reliably stop, making the AC power again 1 half-wave voltage by
The regulation angle of flow puts on the winding, and detects the 4th electric current therefore produced in the winding；
If --- each electric current or the smaller before in each electric current before the 4th electric current is significantly less than, i.e., described electric current meet
Regulation, the switch is persistently connected by the AC mains cycle with the regulation angle of flow immediately, and motor enters synchronous operation；
So repeat, until therefore in each electric current before the electric current that the winding is produced is significantly less than or before in each electric current
Smaller, i.e., described electric current meets regulation, and the switch persistently turns on corner connection by the AC mains cycle and regulation immediately
Logical, motor enters synchronous operation.
3. according to ventilation fan described in claim 1 or 2, it is characterised in that when the electric current is identical regulation in power supply each cycle
The instantaneous value at quarter.
4. according to ventilation fan described in claim 3, it is characterised in that the regulation moment is not more than the AC power 1/8 week
Phase.
5. according to ventilation fan described in claim 1 or 2, it is characterised in that each AC power half-wave voltage is same polarity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510475613.5A CN105071721B (en) | 2015-08-05 | 2015-08-05 | A kind of low-power ventilating fan of small permanent magnetic sychronous motor direct drive |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510475613.5A CN105071721B (en) | 2015-08-05 | 2015-08-05 | A kind of low-power ventilating fan of small permanent magnetic sychronous motor direct drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105071721A CN105071721A (en) | 2015-11-18 |
| CN105071721B true CN105071721B (en) | 2017-10-10 |
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| CN201510475613.5A Active CN105071721B (en) | 2015-08-05 | 2015-08-05 | A kind of low-power ventilating fan of small permanent magnetic sychronous motor direct drive |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105673539B (en) * | 2016-04-05 | 2018-03-30 | 江门市金羚排气扇制造有限公司 | A kind of single-phase axial fan |
| CN106151077B (en) * | 2016-08-09 | 2018-10-16 | 江门市金羚排气扇制造有限公司 | A kind of small-power reversible ventilation fan |
| CN106870414B (en) * | 2017-02-23 | 2019-02-01 | 江门市金羚排气扇制造有限公司 | A kind of small ventilator of single-phase motor driving |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5598071A (en) * | 1994-07-11 | 1997-01-28 | Seagate Technology | Method for starting and commutating a permanent-magnet direct current motor having a single phase winding |
| CN102330702A (en) * | 2011-10-04 | 2012-01-25 | 叶露微 | Low-power ventilating fan |
| CN104806540A (en) * | 2015-04-06 | 2015-07-29 | 叶露微 | Small-power ventilation fan directly driven by permanent magnet motor |
-
2015
- 2015-08-05 CN CN201510475613.5A patent/CN105071721B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5598071A (en) * | 1994-07-11 | 1997-01-28 | Seagate Technology | Method for starting and commutating a permanent-magnet direct current motor having a single phase winding |
| CN102330702A (en) * | 2011-10-04 | 2012-01-25 | 叶露微 | Low-power ventilating fan |
| CN104806540A (en) * | 2015-04-06 | 2015-07-29 | 叶露微 | Small-power ventilation fan directly driven by permanent magnet motor |
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| CN105071721A (en) | 2015-11-18 |
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