CN103384127A - Drive control system of brushless electric machine and control method for same - Google Patents
Drive control system of brushless electric machine and control method for same Download PDFInfo
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- CN103384127A CN103384127A CN2012101335183A CN201210133518A CN103384127A CN 103384127 A CN103384127 A CN 103384127A CN 2012101335183 A CN2012101335183 A CN 2012101335183A CN 201210133518 A CN201210133518 A CN 201210133518A CN 103384127 A CN103384127 A CN 103384127A
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Abstract
The invention discloses a drive control system of a brushless electric machine. The drive control system of the brushless electric machine comprises the brushless electric machine, a single-chip microcomputer and a control circuit, the control circuit comprises three partial voltage branch circuits, the partial voltage branch circuits are in three-phase star connection, the free ends of the partial voltage branch circuits are electrically connected with three stator windings of the brushless electric machine respectively, the three-phase star connecting ends of the partial voltage branch circuits are in ground connection, and the A/D end of the single-chip microcomputer is respectively and electrically connected with the partial voltage branch circuits. The invention further provides a control method for the drive control system of the brushless electric machine. Through the technical scheme, the drive control system of the brushless electric machine and the control method for the drive control system of the brushless electric machine have the advantages that a phase voltage is collected through the single-chip microcomputer, operation processing is carried out on the phase voltage to obtain an accurate reversing signal, and therefore the brushless electric machine is driven to operate, a comparator does not need to be arranged, and due to the fact that elements are reduced, a peripheral circuit is simple, cost is low, and reliability is high.
Description
Technical field
The present invention relates to a kind of driving control system and control method thereof of brushless electric machine, be specifically related to for family's fan, without the blade fan field, a kind of with chip microcontroller without driving control system and the control method thereof of Hall without the brushless electric machine of comparator.
Background technology
At present, on market, most of brushless electric machines of controlling without Hall are all to carry out conversion to rotor-position signal with comparator, its operation principle is: respectively three phase voltage signals are carried out the filtering of RC dividing potential drop, an and then virtual mid-point voltage signal, owing to being 120 degree commutations, so all the time, have one and be in mutually not on-state, virtual mid-point voltage signal and not road child's a phase signals compare, just can access the crossover point signal of a back electromotive force, then be exactly a commutation signal with 30 ° of angles of this signal lag.This control method can normally be controlled the running of brushless electric machine, but also can bring hidden danger: RC filtering meeting causes phase shift, can cause commutation inaccurate if deal with improperly, and motor is difficult to be operated in a good state; Because needs use three road comparators, peripheral circuit is very various, and cost is higher, and circuit is complicated, easily breaks down.
Summary of the invention
For solving the problems of the technologies described above, the object of the present invention is to provide a kind of driving control system and control method thereof of brushless electric machine, effectively control brushless electric machine and obtain a correct commutation signal, thereby drive the brushless electric machine operation, do not need to arrange comparator, peripheral circuit is simple, and cost is low, and reliability is high.
For achieving the above object, technical scheme of the present invention is as follows: a kind of driving control system of brushless electric machine, comprise brushless electric machine, single-chip microcomputer and control circuit, described control circuit comprises three dividing potential drop branch roads, described dividing potential drop branch road is done the three-phase Y-connection, the free end of described dividing potential drop branch road is electrically connected to three stator winding of described brushless electric machine respectively, the three-phase Y-connection end ground connection of described dividing potential drop branch road, and the A/D end of described single-chip microcomputer is electrically connected to described dividing potential drop branch road respectively.
Preferably, described dividing potential drop branch road is provided with at least one divider resistance.
Preferably, described dividing potential drop branch road is done the three-phase symmetrical Y-connection.
A kind of control method of driving control system of brushless electric machine has the following step:
(1). when brushless electric machine was worked, its three terminal A, B, C produced back-emf signal;
(2). back-emf signal acts directly on the dividing potential drop branch road that is electrically connected to brushless electric machine, and obtains phase voltage Va, Vb, Vc;
(3). because the A/D of single-chip microcomputer end is electrically connected to the dividing potential drop branch road respectively, single-chip microcomputer to collect phase voltage Va, Vb, Vc carries out calculation process;
(4). due to Va+Vb+Vc=3Vn, single-chip microcomputer enlarges three times with the phase voltage that collects, and by calculation process, can access a correct commutation signal with 3Vn, thereby drives the brushless electric machine operation.
Adopt the beneficial effect of the technical program to be: to gather phase voltage by single-chip microcomputer, phase voltage is carried out calculation process, obtain a correct commutation signal, thereby drive the brushless electric machine operation, do not need to arrange comparator, owing to having reduced element, peripheral circuit is simple, and cost is low, and reliability is high.
Description of drawings
In order to be illustrated more clearly in the technical scheme in embodiment of the present invention technology, the below will do to introduce simply to the accompanying drawing of required use in the embodiment technical description, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is electrical structure schematic diagram of the present invention.
Numeral and the represented corresponding component title of letter in figure:
1. motor 2. single-chip microcomputer 3. control circuit 4. dividing potential drop branch road 5. dividing potential drop branch road 6. dividing potential drop branch road A. stator winding terminal B. stator winding terminal C. stator winding terminal R. divider resistances.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Embodiment 1
As shown in Figure 1, the driving control system of a kind of brushless electric machine of the present invention, comprise brushless electric machine 1, single-chip microcomputer 2 and control circuit 3, control circuit 3 comprises three dividing potential drop branch roads 4,5,6, dividing potential drop branch road 4,5,6 is done the three-phase Y-connection, dividing potential drop branch road 4,5,6 free end are electrically connected to terminal A, B, the C of the stator winding of brushless electric machine 1 respectively, dividing potential drop branch road 4,5,6 three-phase Y-connection end ground connection, and the A/D end of single-chip microcomputer 2 is electrically connected to dividing potential drop branch road 4,5,6 respectively.In the present embodiment, dividing potential drop branch road 4,5,6 is done the three-phase symmetrical Y-connection, and is respectively equipped with two divider resistance R.When brushless electric machine is worked, its three terminal A, B, C produce back-emf signal, single-chip microcomputer 1 gathers phase voltage, and phase voltage is carried out calculation process, obtains a correct commutation signal, thereby drive the brushless electric machine operation, do not need to arrange comparator, owing to having reduced element, peripheral circuit is simple, cost is low, and reliability is high.
A kind of control method of driving control system of brushless electric machine has the following step:
(1). when brushless electric machine was worked, its three terminal A, B, C produced back-emf signal;
(2). back-emf signal acts directly on the dividing potential drop branch road that is electrically connected to brushless electric machine, and obtains phase voltage Va, Vb, Vc;
(3). because the A/D of single-chip microcomputer end is electrically connected to the dividing potential drop branch road respectively, single-chip microcomputer to collect phase voltage Va, Vb, Vc carries out calculation process;
(4). due to Va+Vb+Vc=3Vn, single-chip microcomputer enlarges three times with the phase voltage that collects, and by calculation process, can access a correct commutation signal with 3Vn, thereby drives the brushless electric machine operation.
The back-emf signal that produces when working due to brushless electric machine obtains phase voltage through after control circuit, gathers phase voltage by single-chip microcomputer, phase voltage is enlarged three times, by calculation process, can access a correct commutation signal with 3Vn, thereby drive the brushless electric machine operation.Saved external comparator, peripheral circuit is simple, and cost is low, has high cost performance, and due to after the element minimizing, its reliability improves simultaneously.
All the other are identical with embodiment 1, and difference is, the dividing potential drop branch road is provided with three divider resistances.Divider resistance is provided with at least one, and according to the difference of work requirements, the dividing potential drop branch road arranges the divider resistance of varying number, thereby satisfies work requirements.
Adopt the beneficial effect of the technical program to be: to gather phase voltage by single-chip microcomputer, phase voltage is carried out calculation process, obtain a correct commutation signal, thereby drive the brushless electric machine operation, do not need to arrange comparator, owing to having reduced element, peripheral circuit is simple, and cost is low, and reliability is high.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from the spirit or scope of the present invention, realization in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (4)
1. the driving control system of a brushless electric machine, it is characterized in that, comprise brushless electric machine, single-chip microcomputer and control circuit, described control circuit comprises three dividing potential drop branch roads, described dividing potential drop branch road is done the three-phase Y-connection, the free end of described dividing potential drop branch road is electrically connected to three stator winding of described brushless electric machine respectively, the three-phase Y-connection end ground connection of described dividing potential drop branch road, and the A/D end of described single-chip microcomputer is electrically connected to described dividing potential drop branch road respectively.
2. the driving control system of a kind of brushless electric machine according to claim 1, is characterized in that, described dividing potential drop branch road is provided with at least one divider resistance.
3. the driving control system of a kind of brushless electric machine according to claim 1 and 2, is characterized in that, described dividing potential drop branch road is done the three-phase symmetrical Y-connection.
4. the control method of the driving control system of a brushless electric machine, is characterized in that, the driving control system of described brushless electric machine is the driving control system of the described brushless electric machine of claim 1, and its control method has the following step:
(1). when brushless electric machine was worked, its three terminal A, B, C produced back-emf signal;
(2). back-emf signal acts directly on the dividing potential drop branch road that is electrically connected to brushless electric machine, and obtains phase voltage Va, Vb, Vc;
(3). because the A/D of single-chip microcomputer end is electrically connected to the dividing potential drop branch road respectively, single-chip microcomputer to collect phase voltage Va, Vb, Vc carries out calculation process;
(4). due to Va+Vb+Vc=3Vn, single-chip microcomputer enlarges three times with the phase voltage that collects, and by calculation process, can access a correct commutation signal with 3Vn, thereby drives the brushless electric machine operation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101335183A CN103384127A (en) | 2012-05-03 | 2012-05-03 | Drive control system of brushless electric machine and control method for same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101335183A CN103384127A (en) | 2012-05-03 | 2012-05-03 | Drive control system of brushless electric machine and control method for same |
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| CN103384127A true CN103384127A (en) | 2013-11-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112154600A (en) * | 2019-10-30 | 2020-12-29 | 深圳市大疆创新科技有限公司 | Motor control device, equipment, system and control method thereof |
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| CN201307843Y (en) * | 2008-09-27 | 2009-09-09 | 刘瑜 | Commutation point detection circuit of sensorless and brushless DC motor |
| EP1516422B1 (en) * | 2002-06-21 | 2010-04-21 | International Business Machines Corporation | A control circuit and method for a sensorless brushless motor |
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| EP1516422B1 (en) * | 2002-06-21 | 2010-04-21 | International Business Machines Corporation | A control circuit and method for a sensorless brushless motor |
| CN201307843Y (en) * | 2008-09-27 | 2009-09-09 | 刘瑜 | Commutation point detection circuit of sensorless and brushless DC motor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112154600A (en) * | 2019-10-30 | 2020-12-29 | 深圳市大疆创新科技有限公司 | Motor control device, equipment, system and control method thereof |
| CN112154600B (en) * | 2019-10-30 | 2024-03-26 | 深圳市大疆创新科技有限公司 | Motor control device, equipment, system and control method thereof |
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Application publication date: 20131106 |