CN105515470A - Rotor position detection circuit for direct-current brushless motors - Google Patents
Rotor position detection circuit for direct-current brushless motors Download PDFInfo
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- CN105515470A CN105515470A CN201610034663.4A CN201610034663A CN105515470A CN 105515470 A CN105515470 A CN 105515470A CN 201610034663 A CN201610034663 A CN 201610034663A CN 105515470 A CN105515470 A CN 105515470A
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- electromotive force
- detection circuit
- direct
- brushless motor
- circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/14—Electronic commutators
- H02P6/16—Circuit arrangements for detecting position
- H02P6/18—Circuit arrangements for detecting position without separate position detecting elements
- H02P6/182—Circuit arrangements for detecting position without separate position detecting elements using back-emf in windings
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention provides a rotor position detection circuit for direct-current brushless motors, which comprises three sets of detection circuits, and each set of detection circuit detects the counter electromotive force of one phase of a direct-current brushless motor; in each set of detection circuit, the counter electromotive force is inputted into the detection circuit, voltage division is first carried out by a resistor network, direct current is then isolated by capacitors, filtration is then carried out by a resistor-capacitor network, so that a counter electromotive force signal with reference voltage as a center is obtained, and finally by comparing the reference voltage, the zero-crossing point of the counter electromotive force is obtained by detection; according to the zero-crossing points of the counter electromotive forces of the three phases of the direct-current brushless motor obtained by the three sets of detection circuits, the rotor position of the direct-current brushless motor is obtained. Compared with the typical detection circuit, the circuit can accurately detect the zero-crossing points, increases the working efficiency of the motor, and is low in heat. Moreover, the circuit does not need to adjust and match the front-end resistor-capacitor network, and therefore is convenient and flexible.
Description
Technical field
The present invention relates to technical field of motors, be specially a kind of rotor position detection circuit of DC brushless motor.
Background technology
Permanent-magnet brushless DC electric machine is because its non-commutation spark, reliable, easy to maintenance, structure are simple, without many merits such as excitation losses, since appearance the 1950's, just obtained applying more and more widely in a lot of occasion.Traditional permanent-magnet brushless DC electric machine all needs an additional position transducer, in order to provide necessary commutation signal to inverter bridge.Its existence brings a lot of inconvenience to the application of DC brushless motor: first, and position transducer can increase volume and the cost of motor; Secondly, the position transducer that line is numerous can reduce motor reliability of operation, even if the Hall element be most widely used now, also there is magnetic immunity region to a certain degree; Again, in the operational environment that some is severe, as in the compressor of air conditioner of sealing, due to the severe corrosive of cold-producing medium, conventional position transducer just cannot use at all; In addition, the installation accuracy of transducer also can affect the runnability of motor, increases the technology difficulty of producing.For all adverse effects that position transducer brings, over nearly ten or twenty year, the position Sensorless Control of permanent-magnet brushless DC electric machine is research topic comparatively popular both at home and abroad always.
Position Sensorless Control, in the process of motor rotation, rotor-position signal as inverter bridge power device commutation conducting sequential remains needs, only this signal is no longer provided by position transducer, and should be replaced by new position signalling detection method, the complexity of motor is namely reduced with the complexity improving circuit and control.So, the core of current permanent-magnet brushless DC electric machine position Sensorless Control research and key are exactly framework one rotor-position signal detection line, indirectly obtain reliable rotor-position signal from software and hardware two aspects, so as to the corresponding power device of triggering and conducting, drive motors operates.
In DC brushless motor, by the effect of the resultant magnetic field that stator winding produces, rotor rotates along certain direction.Motor stator is placed with armature winding, and therefore, rotor is once rotate the situation that will form conductor cutting magnetic line in space.According to the law of electromagnetic induction, conductor cutting magnetic line can produce Induction Heating in the conductor.So will produce induced potential in the stator windings when rotor rotates, i.e. motion electromotive force, is commonly referred to as back electromotive force or back-emf.
There is the three-phase brushless dc motor main circuit of trapezoidal BEMF waveform as shown in Figure 1.OUT-U, OUT-V and OUT-W are that the three-phase of full bridge inverter exports, direct-driving motor.Three R1 resistance form star-like connection, fictionalize neutral point.RF resistance is current sense resistor, protects for overcurrent.RA and RB resistance forms potential-divider network, forms reference voltage.Neutral point voltage compares with reference voltage, thus gets altogether 6 zero crossings of three-phase inverse electromotive force within an electrical degree cycle.The drive waveforms of OUT-U phase and OUT-V phase as can see from Figure 2, the third line waveform is the waveform of three-phase neutral point, and fourth line waveform is the output waveform of comparator, wherein contains the zero crossing information of inverse electromotive force.Solid line is the reference voltage of comparator negative input end.
The advantage of this back-emf zero-crossing detection circuit above-mentioned is that structure is simple, cost is low, but shortcoming is also fairly obvious.The reference voltage of comparator negative input end needs to adjust, and this just will inevitably make the zero crossing that detects and real zero-crossing point there are some phase errors, and when causing motor to run, existence is more or less shaken.Under same loading condition, bus current becomes large, electric efficiency step-down, and heating increases.Can production process be increased when a large amount of production simultaneously, lose time, thus raise the cost.The zero crossing waveform that comparator detects in addition does not comprise phase sequence information, necessary hypothesis driven phase sequence during use, otherwise there is the risk driving step-out.
Summary of the invention
For solving prior art Problems existing, the present invention proposes a kind of rotor position detection circuit of DC brushless motor, inverse electromotive force zero-crossing detection circuit is improved, use the direct current signal in electric capacity separation inverse electromotive force, and each road inverse electromotive force and reference voltage are compared, thus complete zero-crossing examination.
Technical scheme of the present invention is:
The rotor position detection circuit of described a kind of DC brushless motor, is characterized in that: comprise three groups of testing circuits, often organizes the phase inverse electromotive force that testing circuit detects DC brushless motor respectively; Often organizing in testing circuit, inverse electromotive force input detecting circuit, first voltage division processing is carried out by resistor network, direct current is separated again by electric capacity, then by resistance-capacitance network filtering, obtain the inverse electromotive force signal centered by reference voltage, finally compare with reference voltage, detect the zero crossing obtaining inverse electromotive force; According to the DC brushless motor three-phase inverse electromotive force zero crossing that three groups of testing circuits obtain, obtain the rotor-position of DC brushless motor.
Beneficial effect
The present invention detects the inverse electromotive force of each phase of DC brushless motor respectively by testing circuit, in testing circuit, by resistance-capacitance network, the DC component in inverse electromotive force is separated, and compare with fixing reference voltage, the real zero-crossing point of each phase inverse electromotive force can be obtained.
Compared with the testing circuit of classics, this circuit zero-crossing examination is accurate, and improve the operating efficiency of motor, caloric value is low.And this circuit need not carry out adjustment coupling to the resistance-capacitance network of front end, convenient, flexible, although circuit cost increase is a bit, be the reduction of production link, improve efficiency, balance overall cost and still decline.
Accompanying drawing explanation
Fig. 1: classical inverse electromotive force zero-crossing detection circuit;
Fig. 2: zero crossing waveform schematic diagram;
Fig. 3: the inverse electromotive force testing circuit after improvement.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
Because current back-emf zero-crossing detection circuit exists problem as described in the background art, the present embodiment improves inverse electromotive force testing circuit, comprise three groups of testing circuits, often organize the phase inverse electromotive force that testing circuit detects DC brushless motor respectively; Often organizing in testing circuit, inverse electromotive force input detecting circuit, first voltage division processing is carried out by resistor network, direct current is separated again by electric capacity, then by resistance-capacitance network filtering, obtain the inverse electromotive force signal centered by reference voltage, finally compare with reference voltage, detect the zero crossing obtaining inverse electromotive force.
For A opposite potential, the resistance pressure-dividing network that PA_OUTU signal is consisted of R26 and R34 resistance, amplitude will be original 1/11, C15 electric capacity filters the flip-flop in back-emf signal, again through the low-pass filter network of R31 and C17 formation, obtain the back-emf signal centered by reference voltage CAMP_REF, compare with reference voltage CAMP_REF, obtain the zero crossing of A opposite potential.
The last DC brushless motor three-phase inverse electromotive force zero crossing obtained according to three groups of testing circuits, obtains the rotor-position of DC brushless motor.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, those of ordinary skill in the art can change above-described embodiment within the scope of the invention when not departing from principle of the present invention and aim, revising, replacing and modification.
Claims (1)
1. a rotor position detection circuit for DC brushless motor, is characterized in that: comprise three groups of testing circuits, often organizes the phase inverse electromotive force that testing circuit detects DC brushless motor respectively; Often organizing in testing circuit, inverse electromotive force input detecting circuit, first voltage division processing is carried out by resistor network, direct current is separated again by electric capacity, then by resistance-capacitance network filtering, obtain the inverse electromotive force signal centered by reference voltage, finally compare with reference voltage, detect the zero crossing obtaining inverse electromotive force; According to the DC brushless motor three-phase inverse electromotive force zero crossing that three groups of testing circuits obtain, obtain the rotor-position of DC brushless motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610034663.4A CN105515470A (en) | 2016-01-19 | 2016-01-19 | Rotor position detection circuit for direct-current brushless motors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610034663.4A CN105515470A (en) | 2016-01-19 | 2016-01-19 | Rotor position detection circuit for direct-current brushless motors |
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| CN105515470A true CN105515470A (en) | 2016-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610034663.4A Pending CN105515470A (en) | 2016-01-19 | 2016-01-19 | Rotor position detection circuit for direct-current brushless motors |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208840A (en) * | 2016-08-29 | 2016-12-07 | 杭州士腾科技有限公司 | Control system and control method |
| CN110557057A (en) * | 2019-08-05 | 2019-12-10 | 浙江芯菲智能科技有限公司 | Back electromotive force zero-crossing detection circuit of permanent magnet brushless direct current motor |
| CN115912801A (en) * | 2023-01-04 | 2023-04-04 | 娄底市创微达电器有限公司 | Device and method for detecting position of rotor of brushless direct current motor |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05236786A (en) * | 1992-02-20 | 1993-09-10 | Fujitsu General Ltd | Rotor position detecting method for commutatorless motor |
| CN201051732Y (en) * | 2007-02-02 | 2008-04-23 | 浙江大学 | Pure hardware independent device for no sensor brushless DC electromotor start |
| CN202495904U (en) * | 2012-03-31 | 2012-10-17 | 苏州大一装备科技有限公司 | Electronic commutation detection circuit of brushless dc motor without positioning sensors |
| US20120326647A1 (en) * | 2011-06-21 | 2012-12-27 | Richtek Technology Corp | Zero-crossing detection circuit and commutation device using the zero-crossing detection circuit |
| CN203219231U (en) * | 2013-05-14 | 2013-09-25 | 哈尔滨理工大学 | Back electromotive force zero cross detection circuit of brushless direct current motor |
| CN106134513B (en) * | 2009-10-22 | 2013-10-23 | 北京卫星制造厂 | A kind of outer rotor brushless DC motor is without sensor numeral commutating circuit |
| CN203289362U (en) * | 2013-05-23 | 2013-11-13 | 利尔达科技集团股份有限公司 | Control device for brushless motor |
| CN203554345U (en) * | 2013-09-11 | 2014-04-16 | 常州信息职业技术学院 | Constant phase shifting and changing signal detector for brushless DC motor |
-
2016
- 2016-01-19 CN CN201610034663.4A patent/CN105515470A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05236786A (en) * | 1992-02-20 | 1993-09-10 | Fujitsu General Ltd | Rotor position detecting method for commutatorless motor |
| CN201051732Y (en) * | 2007-02-02 | 2008-04-23 | 浙江大学 | Pure hardware independent device for no sensor brushless DC electromotor start |
| CN106134513B (en) * | 2009-10-22 | 2013-10-23 | 北京卫星制造厂 | A kind of outer rotor brushless DC motor is without sensor numeral commutating circuit |
| US20120326647A1 (en) * | 2011-06-21 | 2012-12-27 | Richtek Technology Corp | Zero-crossing detection circuit and commutation device using the zero-crossing detection circuit |
| CN202495904U (en) * | 2012-03-31 | 2012-10-17 | 苏州大一装备科技有限公司 | Electronic commutation detection circuit of brushless dc motor without positioning sensors |
| CN203219231U (en) * | 2013-05-14 | 2013-09-25 | 哈尔滨理工大学 | Back electromotive force zero cross detection circuit of brushless direct current motor |
| CN203289362U (en) * | 2013-05-23 | 2013-11-13 | 利尔达科技集团股份有限公司 | Control device for brushless motor |
| CN203554345U (en) * | 2013-09-11 | 2014-04-16 | 常州信息职业技术学院 | Constant phase shifting and changing signal detector for brushless DC motor |
Non-Patent Citations (3)
| Title |
|---|
| 朱亚丽: "《模拟电路及其产品安装调试》", 31 March 2015, 中国电力出版社 * |
| 林明耀等: "反电势法无位置传感器无刷直流电机最佳换相逻辑分析", 《中小型电机》 * |
| 田德文等: "空调用永磁无刷直流电动机控制器设计", 《微电机》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208840A (en) * | 2016-08-29 | 2016-12-07 | 杭州士腾科技有限公司 | Control system and control method |
| CN110557057A (en) * | 2019-08-05 | 2019-12-10 | 浙江芯菲智能科技有限公司 | Back electromotive force zero-crossing detection circuit of permanent magnet brushless direct current motor |
| CN115912801A (en) * | 2023-01-04 | 2023-04-04 | 娄底市创微达电器有限公司 | Device and method for detecting position of rotor of brushless direct current motor |
| CN115912801B (en) * | 2023-01-04 | 2024-02-02 | 娄底市创微达电器有限公司 | Device and method for detecting rotor position of direct-current brushless motor |
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Application publication date: 20160420 |