CN104702174A - Control system and control method for brushless direct current motor - Google Patents
Control system and control method for brushless direct current motor Download PDFInfo
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- CN104702174A CN104702174A CN201510098672.5A CN201510098672A CN104702174A CN 104702174 A CN104702174 A CN 104702174A CN 201510098672 A CN201510098672 A CN 201510098672A CN 104702174 A CN104702174 A CN 104702174A
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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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- 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
- H02P6/188—Circuit arrangements for detecting position without separate position detecting elements using the voltage difference between the windings
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- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses a control system and a control method for a brushless direct current motor. The control system for the brushless direct current motor comprises a direct current bus connected with a power supply, an inverter connected between the direct current bus and the brushless direct current motor, a resistance network connected with a first node, a second node and a third node, and a controller used for detecting the voltage of each of a first middle point and a second middle point and controlling the brushless direct current motor according to the zero-cross point of the voltage between the first middle point and the second middle point, wherein the direct current bus has the first middle point; the inverter has the first node, second node and third node connected with end points of a three-phase stator winding of the brushless direct current motor; the resistance network has the second middle point. The control system for the brushless direct current motor is capable of precisely controlling the brushless direct current motor according to the zero-cross point of the voltage between the first middle point and the second middle point, the hardware circuit is simplified, and the system cost is lowered.
Description
Technical field
The present invention relates to technical field of motors, particularly relate to a kind of control system of brshless DC motor and a kind of control method of brshless DC motor.
Background technology
The Sensorless Control Technique of brshless DC motor comprises back electromotive force method, and wherein back electromotive force method comprises triple-frequency harmonics method.
In traditional triple-frequency harmonics method, first the voltage signal between resistor network mid point and brshless DC motor three-phase windings neutral point is detected, then through low pass filter filtering high-frequency PWM (Pulse Width Modulation, pulse width modulation) obtain the harmonic signal of the back electromotive force of brshless DC motor after signal, the zero crossing of the harmonic signal after last detection filter the electrical degree of phase shift 30 ° can obtain the commutation point of the three-phase windings of brshless DC motor.But, the method needs brshless DC motor three-phase windings neutral point known, and the voltage signal of detection can produce phase shift after low pass filter conditioning, make to detect obtain there is deviation between commutation point and actual commutation point, reduce the control performance of brshless DC motor.
In addition, the triple-frequency harmonics method improved by detecting voltage signal between resistor network mid point and DC bus mid point to obtain the harmonic signal of the back electromotive force of brshless DC motor, and obtains the commutation point of the three-phase windings of brshless DC motor after filtering with after phase-shift processing.Although the method is known without the need to brshless DC motor three-phase windings neutral point, but, still need low pass filter to carry out filtering process to voltage signal, make to detect obtain there is deviation between commutation point and actual commutation point, reduce the control performance of brshless DC motor.
Summary of the invention
The present invention is intended to solve one of technical problem in correlation technique at least to a certain extent.
For this reason, one object of the present invention is the control system proposing a kind of brshless DC motor, accurately can control, simplify hardware circuit, reduce system cost according to the zero crossing of voltage between the first mid point and the second mid point to brshless DC motor.
Another object of the present invention is the control method proposing a kind of brshless DC motor.
To achieve these goals, the control system of the brshless DC motor that one aspect of the present invention embodiment proposes, comprising: DC bus, described DC bus is connected with power supply, and wherein, described DC bus has the first mid point; Inverter, described inverter is connected between described DC bus and brshless DC motor, and described inverter has the first node that is connected with the threephase stator winding end points of described brshless DC motor to the 3rd node; Resistor network, described resistor network is connected to the 3rd node with described first node respectively, described resistor network has the second mid point, wherein, the voltage between the threephase stator winding mid point of the voltage between described first mid point and the second mid point and described brshless DC motor and described second mid point is equal; And controller, described controller for detecting the voltage of described first mid point and the second mid point, and controls described brshless DC motor according to the zero crossing of voltage between described first mid point and described second mid point.
According to the control system of the brshless DC motor of the embodiment of the present invention, controller detects the voltage of the first mid point of DC bus and the second mid point of resistor network, and controls brshless DC motor according to the zero crossing of voltage between the first mid point of DC bus and the second mid point of resistor network.Therefore, the control system of the brshless DC motor of the embodiment of the present invention is known without the need to the threephase stator winding mid point of brshless DC motor, simultaneously carry out without the need to low pass filter the control that filtering process can realize brshless DC motor, eliminate the error caused because low pass filter produces phase shift, improve the control performance of brshless DC motor, simplify hardware circuit, reduce system cost.
According to one embodiment of present invention, described resistor network comprises: the first resistance is to the 3rd resistance, described first resistance is corresponding with the threephase stator winding end points of described brshless DC motor connected respectively to one end of the 3rd resistance, and described first resistance is connected with described second mid point respectively to the other end of the 3rd resistance.
According to one embodiment of present invention, described first resistance is equal to the resistance of the 3rd resistance.
According to one embodiment of present invention, described controller is according to the zero crossing of the zero crossing determination back electromotive force triple-frequency harmonics of voltage between described first mid point and described second mid point, and the zero crossing of zero crossing determination back electromotive force according to described back electromotive force triple-frequency harmonics, and generate three-phase windings commutation signal according to the zero crossing of described back electromotive force.
To achieve these goals, the present invention on the other hand embodiment proposes the control method of brshless DC motor, the control system of described brshless DC motor comprises DC bus, inverter and resistor network, wherein, described DC bus has the first mid point, described resistor network has the second mid point, voltage between the threephase stator winding mid point of the voltage between described first mid point and the second mid point and described brshless DC motor and described second mid point is equal, and described control method comprises the following steps: the voltage detecting described first mid point and the second mid point; And according to the zero crossing of voltage between described first mid point and described second mid point, described brshless DC motor is controlled.
According to the control method of the brshless DC motor of the embodiment of the present invention, first detect the voltage of the first mid point and the second mid point, then according to the zero crossing of voltage between the first mid point and the second mid point, brshless DC motor is controlled.Therefore, the control method of the brshless DC motor of the embodiment of the present invention is known without the need to the threephase stator winding mid point of brshless DC motor, simultaneously carry out without the need to low pass filter the control that filtering process can realize brshless DC motor, eliminate the error caused because low pass filter produces phase shift, improve the control performance of brshless DC motor, simplify hardware circuit, reduce system cost.
According to one embodiment of present invention, according to the zero crossing of voltage between described first mid point and described second mid point, described brshless DC motor is controlled, specifically comprise: according to the zero crossing of the zero crossing determination back electromotive force triple-frequency harmonics of voltage between described first mid point and described second mid point; According to the zero crossing of the zero crossing determination back electromotive force of described back electromotive force triple-frequency harmonics; And generate three-phase windings commutation signal according to the zero crossing of described back electromotive force, control to realize described brushless direct current motor sensorless.
According to one embodiment of present invention, described resistor network comprises the first resistance to the 3rd resistance, described first resistance is corresponding with the threephase stator winding end points of described brshless DC motor connected respectively to one end of the 3rd resistance, and described first resistance is connected with described second mid point respectively to the other end of the 3rd resistance.
According to one embodiment of present invention, described first resistance is equal to the resistance of the 3rd resistance.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the control system of brshless DC motor according to an embodiment of the invention;
Fig. 2 is the oscillogram of the phase back-emf of brshless DC motor according to an embodiment of the invention;
Fig. 3 is current direction schematic diagram according to an embodiment of the invention;
Fig. 4 is PWM triple-frequency harmonics position Sensorless Control schematic diagram according to an embodiment of the invention; And
Fig. 5 is the flow chart of the control method of brshless DC motor according to the embodiment of the present invention.
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.
Below with reference to the accompanying drawings the control system of the brshless DC motor of the embodiment of the present invention and the control method of brshless DC motor are described.
Fig. 1 is the circuit diagram of the control system of brshless DC motor according to an embodiment of the invention.As shown in Figure 1, the control system of this brshless DC motor comprises DC bus 10, inverter 20, resistor network 30 and controller (not specifically illustrating in figure).
Wherein, DC bus 10 is connected with power supply, and DC bus 10 has the first mid point h.Inverter 20 is connected between DC bus 10 and brshless DC motor, and inverter 20 has first node a, the Section Point b and the 3rd node c that are connected with the threephase stator winding end points of brshless DC motor.Resistor network 30 is connected with the 3rd node c with first node a, Section Point b respectively, resistor network 30 has the second mid point s, and the voltage between the threephase stator winding mid point n of the voltage between the first mid point h and the second mid point s and brshless DC motor and the second mid point s is equal.Controller for detecting the voltage of the first mid point h and the second mid point s, and controls brshless DC motor according to the zero crossing of voltage between the first mid point h and the second mid point s.
According to one embodiment of present invention, as shown in Figure 1, resistor network 30 comprises the first resistance R1, the second resistance R2 and the 3rd resistance R3, wherein, first resistance R1, the second resistance R2 are connected with one end of the 3rd resistance R3 is corresponding with the threephase stator winding end points of brshless DC motor respectively, and the first resistance R1, the second resistance R2 are connected with the second mid point s respectively with the other end of the 3rd resistance R3.
Wherein, the resistance of the first resistance R1, the second resistance R2 and the 3rd resistance R3 is equal.
Particularly, as shown in Figure 1, usually adopt 120 ° of square wave type of drive to drive brshless DC motor to run, when not considering commutation process, any time all only has the conducting of two-phase stator winding.
As shown in Figure 2, the phase back-emf of brshless DC motor is trapezoidal wave.Carry out to the trapezoidal wave shown in Fig. 2 the odd harmonic that Fourier transform can obtain comprising first-harmonic, by known to the amplitude analysis of odd harmonic, the main component of phase back-emf except first-harmonic of brshless DC motor is triple-frequency harmonics.Therefore, the phase back-emf of the brshless DC motor shown in Fig. 2 represents by following formula (1):
e≈E
1sinθ+E
3sin3θ (1)
Wherein, e is the phase back-emf of brshless DC motor, E
1for the basic amplitude of phase back-emf, E
3for the triple-frequency harmonics amplitude of phase back-emf, θ is the rotor position angle of brshless DC motor.
Due to the electrical degree of emf phase mutual deviation 120 ° in phase place of the threephase stator winding of brshless DC motor, therefore, the phase back-emf sum of the threephase stator winding of brshless DC motor represents with following formula (2):
e
a+e
b+e
c≈3E
3sin3θ (2)
Wherein, e
afor a phase back-emf of stator winding, e
bfor the b phase back-emf of stator winding, e
cfor the c phase back-emf of stator winding.
In addition, as shown in Figure 1, the end-point voltage of the threephase stator winding of brshless DC motor represents with following formula (3):
Wherein, u
anfor a phase end-point voltage of stator winding, u
bnfor the b phase end-point voltage of stator winding, u
cnfor the c phase end-point voltage of stator winding, R is stator winding resistance, L
sfor stator winding inductance, i
afor a phase current of stator winding, i
bfor the b phase current of stator winding, i
cfor the c phase current of stator winding.
According to the known i of Kirchhoff's current law (KCL)
a+ i
b+ i
c=0, and according to above-mentioned formula (2) and formula (3) known, the end-point voltage sum of the threephase stator winding of brshless DC motor and the phase back-emf sum of threephase stator winding meet following formula (4):
u
an+u
bn+u
cn＝e
a+e
b+e
c≈3E
3sin3θ (4)
In addition, as shown in Figure 1, according to Kirchhoff's second law:
Wherein, u
nsfor the voltage between threephase stator winding mid point n and the second mid point s, u
sabe the voltage between the second mid point s and first node a, u
sbbe the voltage between the second mid point s and Section Point b, u
scbe the voltage between the second mid point s and the 3rd node c.
Further, according to the known u of Kirchhoff's second law
sa+ u
sb+ u
sc=0, therefore, three formulas in above-mentioned formula (5) are added the voltage that can obtain between the threephase stator winding mid point n of brshless DC motor and the second mid point s, represent with following formula (6):
From above-mentioned formula (6), the threephase stator winding mid point n of brshless DC motor only differs a negative sign with the voltage between the second mid point s with the triple-frequency harmonics of the phase back-emf of the stator winding of brshless DC motor.Therefore, in the control system of traditional brshless DC motor, first controller detects the voltage signal between the threephase stator winding mid point n of brshless DC motor and the second mid point s in real time, and by low pass filter, the high-frequency switching signal in this voltage signal is carried out filtering, then namely the zero crossing of the voltage signal of controller detection after filtering process obtains the zero crossing of the triple-frequency harmonics of phase back-emf, and then obtain the zero crossing of phase back-emf, the commutation signal of threephase stator winding is obtained after the electrical degree of phase shift 30 °, thus realize the position Sensorless Control of brshless DC motor.
But, when voltage signal between the threephase stator winding mid point n by detecting brshless DC motor and the second mid point s controls brshless DC motor, need the threephase stator winding mid point n of brshless DC motor known, need low pass filter to process the voltage signal detected simultaneously, hardware circuit is complicated, and the phase shift of low pass filter can produce certain error.Therefore, in an embodiment of the present invention, by virtual mid point reconstruct PWM triple-frequency harmonics to determine the commutation signal of threephase stator winding, thus the position Sensorless Control of brshless DC motor is realized.
According to one embodiment of present invention, controller is according to the zero crossing of the zero crossing determination back electromotive force triple-frequency harmonics of voltage between the first mid point h and the second mid point s, and the zero crossing of zero crossing determination back electromotive force according to back electromotive force triple-frequency harmonics, and generate three-phase windings commutation signal according to the zero crossing of back electromotive force.
Particularly, as shown in Figure 3, flow into c phase for electric current from a phase of stator winding to flow out.Wherein, power switch tube S 1 adopts PWM to control, and power switch tube S 2 keeps conducting state, when power switch tube S 1 and power switch tube S 2 conducting simultaneously, according to Kirchhoff's second law:
u
ah+u
hs+u
sn+u
na＝0 (7)
Wherein, u
ahfor the voltage between first node a and the first mid point h, u
hsbe the voltage between the first mid point h and the second mid point s, u
snbe the voltage between the second mid point s and threephase stator winding mid point n, u
nafor the voltage between threephase stator winding mid point n and first node a.
Further,
wherein, U
dcfor DC bus-bar voltage, bring above-mentioned formula (7) into and can obtain following formula (8):
u
hs＝u
ns＝-E
3sin 3θ (8)
From above-mentioned formula (8), in power switch tube S 1 conduction period, the voltage u between the first mid point h and the second mid point s
hsand the voltage u between the threephase stator winding mid point n of brshless DC motor and the first mid point s
nsequal.Therefore, the zero crossing of the triple-frequency harmonics of phase back-emf can be obtained by the zero crossing detecting the voltage between the first mid point h and the second mid point s, thus obtain the zero crossing of phase back-emf, and then generate the commutation signal of three-phase windings according to the zero crossing of phase back-emf.Under other five kinds of conducting states, there is similar principle, repeat no more here.
Further, as shown in Figure 4, voltage between the first mid point h and the second mid point s whether zero passage (ZCP as in Fig. 4) is detected in the power switch pipe conduction period of the upper brachium pontis of inverter 20, when the voltage zero-cross between the first mid point h and the second mid point s being detected, digital signal processor starts and starts timing, the electrical degree that rotor position angle time delay is 30 ° can obtain the commutation point (CMP as in Fig. 4) of brshless DC motor, thus realizes the position Sensorless Control of brshless DC motor.
In sum, according to the control system of the brshless DC motor of the embodiment of the present invention, controller detects the voltage of the first mid point of DC bus and the second mid point of resistor network, and controls brshless DC motor according to the zero crossing of voltage between the first mid point of DC bus and the second mid point of resistor network.Therefore, the control system of the brshless DC motor of the embodiment of the present invention is known without the need to the threephase stator winding mid point of brshless DC motor, simultaneously carry out without the need to low pass filter the control that filtering process can realize brshless DC motor, eliminate the error caused because low pass filter produces phase shift, improve the control performance of brshless DC motor, simplify hardware circuit, reduce system cost.
Fig. 5 is the flow chart of the control method of brshless DC motor according to the embodiment of the present invention.Wherein, the control system of brshless DC motor comprises DC bus, inverter and resistor network, DC bus has the first mid point h, resistor network has the second mid point s, and the voltage between the threephase stator winding mid point n of the voltage between the first mid point h and the second mid point s and brshless DC motor and the second mid point s is equal.
According to one embodiment of present invention, as shown in Figure 1, resistor network comprises the first resistance to the 3rd resistance, and the first resistance is corresponding with the threephase stator winding end points of brshless DC motor connected respectively to one end of the 3rd resistance, and the first resistance is connected with the second mid point respectively to the other end of the 3rd resistance.
Wherein, the first resistance is equal to the resistance of the 3rd resistance.
As shown in Figure 5, the control method of this brshless DC motor comprises the following steps:
S1, detects the voltage of the first mid point h and the second mid point s.
S2, controls brshless DC motor according to the zero crossing of voltage between the first mid point h and the second mid point s.
According to one embodiment of present invention, according to the zero crossing of voltage between the first mid point h and the second mid point s, brshless DC motor is controlled, specifically comprise: according to the zero crossing of the zero crossing determination back electromotive force triple-frequency harmonics of voltage between the first mid point h and the second mid point s; According to the zero crossing of the zero crossing determination back electromotive force of back electromotive force triple-frequency harmonics; And generate three-phase windings commutation signal according to the zero crossing of back electromotive force, control to realize brushless direct current motor sensorless.
Particularly, from above-mentioned formula (6), the threephase stator winding mid point n of brshless DC motor only differs a negative sign with the voltage between the second mid point s with the triple-frequency harmonics of the phase back-emf of the stator winding of brshless DC motor.Therefore, in the control method of traditional brshless DC motor, first the voltage signal between the threephase stator winding mid point n of brshless DC motor and the second mid point s is detected in real time, and by low pass filter, the high-frequency switching signal in this voltage signal is carried out filtering, then namely the zero crossing detecting the voltage signal after filtering process obtains the zero crossing of the triple-frequency harmonics of phase back-emf, and then obtain the zero crossing of phase back-emf, the commutation signal of threephase stator winding is obtained after the electrical degree of phase shift 30 °, thus realize the position Sensorless Control of brshless DC motor.
But, when voltage signal between the threephase stator winding mid point n by detecting brshless DC motor and the second mid point s controls brshless DC motor, need the threephase stator winding mid point n knowing brshless DC motor, need low pass filter to process the voltage signal detected simultaneously, hardware circuit is complicated, and the phase shift of low pass filter can produce certain error.Therefore, in an embodiment of the present invention, by virtual mid point reconstruct PWM triple-frequency harmonics to determine the commutation signal of threephase stator winding, thus the position Sensorless Control of brshless DC motor is realized.
From above-mentioned formula (8), in power switch tube S 1 conduction period, the voltage u between the first mid point h and the second mid point s
hsand the voltage u between the threephase stator winding mid point n of brshless DC motor and the first mid point s
nsequal.Therefore, the zero crossing of the triple-frequency harmonics of phase back-emf can be obtained by the zero crossing detecting the voltage between the first mid point h and the second mid point s, thus obtain the zero crossing of phase back-emf, and then generate the commutation signal of three-phase windings according to the zero crossing of phase back-emf.
As shown in Figure 4, voltage between the first mid point h and the second mid point s whether zero passage (ZCP as in Fig. 4) is detected in the power switch pipe conduction period of the upper brachium pontis of inverter, when the voltage zero-cross between the first mid point h and the second mid point s being detected, digital signal processor starts and starts timing, the electrical degree that rotor position angle time delay is 30 ° can obtain the commutation point (CMP as in Fig. 4) of brshless DC motor, thus realizes the position Sensorless Control of brshless DC motor.
According to the control method of the brshless DC motor of the embodiment of the present invention, first detect the voltage of the first mid point and the second mid point, then according to the zero crossing of voltage between the first mid point and the second mid point, brshless DC motor is controlled.Therefore, the control method of the brshless DC motor of the embodiment of the present invention is known without the need to the threephase stator winding mid point of brshless DC motor, simultaneously carry out without the need to low pass filter the control that filtering process can realize brshless DC motor, eliminate the error caused because low pass filter produces phase shift, improve the control performance of brshless DC motor, simplify hardware circuit, reduce system cost.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification or example and different embodiment or example can carry out combining and combining by those skilled in the art.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
Describe and can be understood in flow chart or in this any process otherwise described or method, represent and comprise one or more for realizing the module of the code of the executable instruction of the step of specific logical function or process, fragment or part, and the scope of the preferred embodiment of the present invention comprises other realization, wherein can not according to order that is shown or that discuss, comprise according to involved function by the mode while of basic or by contrary order, carry out n-back test, this should understand by embodiments of the invention person of ordinary skill in the field.
In flow charts represent or in this logic otherwise described and/or step, such as, the sequencing list of the executable instruction for realizing logic function can be considered to, may be embodied in any computer-readable medium, for instruction execution system, device or equipment (as computer based system, comprise the system of processor or other can from instruction execution system, device or equipment instruction fetch and perform the system of instruction) use, or to use in conjunction with these instruction execution systems, device or equipment.With regard to this specification, " computer-readable medium " can be anyly can to comprise, store, communicate, propagate or transmission procedure for instruction execution system, device or equipment or the device that uses in conjunction with these instruction execution systems, device or equipment.The example more specifically (non-exhaustive list) of computer-readable medium comprises following: the electrical connection section (electronic installation) with one or more wiring, portable computer diskette box (magnetic device), random access memory (RAM), read-only memory (ROM), erasablely edit read-only memory (EPROM or flash memory), fiber device, and portable optic disk read-only memory (CDROM).In addition, computer-readable medium can be even paper or other suitable media that can print described program thereon, because can such as by carrying out optical scanner to paper or other media, then carry out editing, decipher or carry out process with other suitable methods if desired and electronically obtain described program, be then stored in computer storage.
Should be appreciated that each several part of the present invention can realize with hardware, software, firmware or their combination.In the above-described embodiment, multiple step or method can with to store in memory and the software performed by suitable instruction execution system or firmware realize.Such as, if realized with hardware, the same in another embodiment, can realize by any one in following technology well known in the art or their combination: the discrete logic with the logic gates for realizing logic function to data-signal, there is the application-specific integrated circuit (ASIC) of suitable combinational logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) etc.
Those skilled in the art are appreciated that realizing all or part of step that above-described embodiment method carries is that the hardware that can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, this program perform time, step comprising embodiment of the method one or a combination set of.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing module, also can be that the independent physics of unit exists, also can be integrated in a module by two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.If described integrated module using the form of software function module realize and as independently production marketing or use time, also can be stored in a computer read/write memory medium.
The above-mentioned storage medium mentioned can be read-only memory, disk or CD etc.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, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (8)
1. a control system for brshless DC motor, is characterized in that, comprising:
DC bus, described DC bus is connected with power supply, and wherein, described DC bus has the first mid point;
Inverter, described inverter is connected between described DC bus and brshless DC motor, and described inverter has the first node that is connected with the threephase stator winding end points of described brshless DC motor to the 3rd node;
Resistor network, described resistor network is connected to the 3rd node with described first node respectively, described resistor network has the second mid point, wherein, the voltage between the threephase stator winding mid point of the voltage between described first mid point and the second mid point and described brshless DC motor and described second mid point is equal; And
Controller, described controller for detecting the voltage of described first mid point and the second mid point, and controls described brshless DC motor according to the zero crossing of voltage between described first mid point and described second mid point.
2. the control system of brshless DC motor as claimed in claim 1, it is characterized in that, described resistor network comprises:
First resistance is to the 3rd resistance, and described first resistance is corresponding with the threephase stator winding end points of described brshless DC motor connected respectively to one end of the 3rd resistance, and described first resistance is connected with described second mid point respectively to the other end of the 3rd resistance.
3. the control system of brshless DC motor as claimed in claim 2, it is characterized in that, described first resistance is equal to the resistance of the 3rd resistance.
4. the control system of brshless DC motor as claimed in claim 1, it is characterized in that, described controller is according to the zero crossing of the zero crossing determination back electromotive force triple-frequency harmonics of voltage between described first mid point and described second mid point, and the zero crossing of zero crossing determination back electromotive force according to described back electromotive force triple-frequency harmonics, and generate three-phase windings commutation signal according to the zero crossing of described back electromotive force.
5. the control method of a brshless DC motor, it is characterized in that, the control system of described brshless DC motor comprises DC bus, inverter and resistor network, wherein, described DC bus has the first mid point, described resistor network has the second mid point, and the voltage between the threephase stator winding mid point of the voltage between described first mid point and the second mid point and described brshless DC motor and described second mid point is equal, and described control method comprises the following steps:
Detect the voltage of described first mid point and the second mid point; And
According to the zero crossing of voltage between described first mid point and described second mid point, described brshless DC motor is controlled.
6. the control method of brshless DC motor as claimed in claim 5, is characterized in that, control, specifically comprise according to the zero crossing of voltage between described first mid point and described second mid point to described brshless DC motor:
According to the zero crossing of the zero crossing determination back electromotive force triple-frequency harmonics of voltage between described first mid point and described second mid point;
According to the zero crossing of the zero crossing determination back electromotive force of described back electromotive force triple-frequency harmonics; And
Zero crossing according to described back electromotive force generates three-phase windings commutation signal, controls to realize described brushless direct current motor sensorless.
7. the control method of brshless DC motor as claimed in claim 5, it is characterized in that, described resistor network comprises the first resistance to the 3rd resistance, described first resistance is corresponding with the threephase stator winding end points of described brshless DC motor connected respectively to one end of the 3rd resistance, and described first resistance is connected with described second mid point respectively to the other end of the 3rd resistance.
8. the control method of brshless DC motor as claimed in claim 7, it is characterized in that, described first resistance is equal to the resistance of the 3rd resistance.
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| CN106059409A (en) * | 2016-05-27 | 2016-10-26 | 北京航空航天大学 | Position sensor-free brushless direct-current motor rotor phase commutation error correction method and control system |
| CN109143064A (en) * | 2018-08-01 | 2019-01-04 | 浙江东方机电有限公司 | Counter electromotive force test device and method in permanent magnet synchronous motor commutation process |
| CN109143064B (en) * | 2018-08-01 | 2020-11-24 | 浙江东方机电有限公司 | Counter electromotive force testing device and method in reversing process of permanent magnet synchronous motor |
| CN109921696A (en) * | 2019-02-25 | 2019-06-21 | 湖南长高思瑞自动化有限公司 | A kind of the zero crossing commutator and control method of permanent-magnet brushless DC electric machine |
| WO2021016782A1 (en) * | 2019-07-29 | 2021-02-04 | 广东美的白色家电技术创新中心有限公司 | Commutation control method and device for brushless direct current motor, and storage medium |
| US11689140B2 (en) | 2019-07-29 | 2023-06-27 | Guangdong Midea White Home Appliance Technology Innovation Center Co., Ltd. | Commutation control method and device for brushless direct current motor, and storage medium |
| CN110829907A (en) * | 2019-10-29 | 2020-02-21 | 河海大学 | Electro-magnetic doubly salient motor position sensorless commutation control method based on neutral point voltage sampling |
| CN110829907B (en) * | 2019-10-29 | 2021-03-02 | 河海大学 | Neutral point-based electro-magnetic doubly salient motor position-sensorless commutation method |
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