CN207339693U - A kind of brushless DC motor control system without position sensor - Google Patents
A kind of brushless DC motor control system without position sensor Download PDFInfo
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- CN207339693U CN207339693U CN201721366851.3U CN201721366851U CN207339693U CN 207339693 U CN207339693 U CN 207339693U CN 201721366851 U CN201721366851 U CN 201721366851U CN 207339693 U CN207339693 U CN 207339693U
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Abstract
A kind of brushless DC motor control system without position sensor of the utility model, is related to brshless DC motor control field；Including controller, line counter electromotive force detection circuit, brshless DC motor, inverter, LC resonance circuit and DC power supply Us, the controller connects brushless direct current motor by line counter electromotive force detection circuit, the controller connects inverter, the controller connects LC resonance circuit, and the DC power supply Us passes sequentially through LC resonance circuit and inverter and powers to brushless direct current motor；The utility model solves the shortcomings that Control System for Brushless DC switching loss is larger, greatly improves the control efficiency of whole system；The shortcomings that position sensor brushless direct current motor volume is not easy to reduce is overcome, have also been enlarged the application range of brushless direct current motor.
Description
Technical field
A kind of brushless DC motor control system without position sensor of the utility model is related to brshless DC motor
Control field.
Background technology
Brushless direct current motor replaces mechanical commutation using electronics commutation, has not only remained the superiority of direct current generator, but also go
Except direct current generator has the shortcomings that mechanical phase changer, therefore it is widely used in many fields.Traditional is brushless straight
Galvanic electricity motivation uses Driven by inverter, and power tube uses the working method of rigid on/off.Since power tube is not ideal component,
The electric current and voltage of power tube cannot be mutated, can be there are a crossover region, therefore produce switching loss, while bring serious electricity
Magnetic disturbance, greatly reduces the efficiency of inverter, also influences the reliability of system.
Soft switch circuit is different from for the traditionally hard switching circuit of rigid switching power switch, it can lead to
The resonance of inductance and capacitance is crossed, power switch is worked under the conditions of no-voltage or zero current, so as to be greatly reduced inverse
Become the switching loss of device, suppress electromagnetism and noise jamming.
In addition, conventional brushless DC motor control system all carries out commutation detection using position sensor, although using
It is relatively easy, but complexity is installed, and the introducing of sensor adds the volume and cost of motor, leverages brushless straight
The application range of galvanic electricity motivation.
Utility model content
In view of the above-mentioned problems, the utility model provides a kind of brushless DC motor position Sensorless Control system
System, using the direct current soft switch circuit based on LC resonance, makes all power switch all work under soft switching conditions, switching loss
Reduce, greatly improve the control efficiency of whole system；Using line counter electromotive force detection circuit, traditional position sensing is eliminated
Device, reduce motor volume, it is cost-effective while, have also been enlarged the application range of brushless direct current motor
What the purpose of this utility model was realized in：
A kind of brushless DC motor control system without position sensor, it is characterised in that anti-including controller, line
Electromotive force detection circuit, brushless direct current motor, inverter, LC resonance circuit and DC power supply Us, the LC resonance circuit according to
Secondary connection inverter, brushless direct current motor, line counter electromotive force detection circuit and controller, the DC power supply Us are passed sequentially through
LC resonance circuit and inverter are powered to brushless direct current motor.
Further, a kind of brushless DC motor control system without position sensor, the line are anti-electronic
Gesture detection circuit includes resistance R5, resistance R6 and resistance R7, and branch is in parallel successively before inverter accesses brushless direct current motor
Three resistance R5, R6 and R7 are accessed, resistance R5, R6 and R7 opposite side is connected to S points.
Further, a kind of brushless DC motor control system without position sensor, the LC resonance electricity
Road includes resistance R1, resistance R2, capacitance C1, capacitance C2, capacitance Cr, inductance Lr, thyristor Sa, thyristor Sb and IGBT element
SL；One end connection resistance R1, the capacitance C1 of DC power supply Us and other end connection thyristor Sa, Sb and capacitance Cr of SL, SL, crystalline substance
Other end connection capacitance C1, C2 and resistance R1, R2 of the other end connection inductance Lr, inductance Lr of brake tube Sa, Sb, capacitance Cr,
C2, resistance R2 are connected with the other end of DC power supply Us.
Further, a kind of brushless DC motor control system without position sensor, the inverter bag
Include IGBT element T1, IGBT element T2, IGBT element T3, IGBT element T4, IGBT element T5, IGBT elements T6, two pole of afterflow
Pipe D1, sustained diode 2, sustained diode 3, sustained diode 4, sustained diode 5 and sustained diode 6；T1 and
D1, T2 and D2, T3 and D3, T4 and D4, T5 and D5, T6 and D6 are in parallel respectively, and T1 and T2, T3 and T4, T5 and T6 connect respectively,
Then by T1 and T2 series arms, T3 and T4 series arms, T5 and T6 series arms, R3 and R4 series arms and capacitance Cr simultaneously
Connection, is powered by the LC resonance circuit.
Beneficial effect：
1st, a kind of brushless DC motor control system without position sensor described in the utility model, it is anti-electric using line
EMF detection circuit, the point of the zero crossing of line counter electromotive force just with the 30 ° of electrical angles that are delayed after counter electromotive force zero passage coincide, just
It is the accurate location of motor commutation well, this detection circuit is fairly simple, then with advanced controller is closed, can save
Position sensor, while reducing motor volume, and can guarantee that brushless direct current motor is normally run.
2nd, a kind of brushless DC motor control system without position sensor described in the utility model, using LC resonance
Circuit, makes capacitance progress discharge and recharge by resonant tank when switching tube is turned on and off the voltage vanishing at capacitance both ends,
I.e. switching tube both end voltage is zero, it is achieved thereby that reduce the purpose of the loss of switching tube, while to the ripple of electric current and voltage
Inhibition is notable, reduces electromagnetic interference.
3rd, a kind of brushless DC motor control system without position sensor described in the utility model, controller pass through
Line counter electromotive force detection circuit connects brushless direct current motor, controller connection inverter, and controller connects LC resonance circuit, directly
Galvanic electricity source Us passes sequentially through LC resonance circuit and inverter and powers to brushless direct current motor, the letter of the utility model circuit structure
It is single, it is easy to accomplish.
Brief description of the drawings
Fig. 1 is a kind of brushless DC motor control system without position sensor structure diagram.
Fig. 2 is a kind of brushless DC motor control system without position sensor topology schematic diagram.
Fig. 3 is LC resonance soft switch circuit equivalent circuit diagram.
In figure：1 controller, 2 line counter electromotive force detection circuits, 3 brushless direct current motors, 4 inverters, 5LC resonance circuits.
Embodiment
The utility model embodiment is described in further detail below in conjunction with the accompanying drawings.
Embodiment one
A kind of brushless DC motor control system without position sensor, it is characterised in that including controller 1, line
Counter electromotive force detection circuit 2, brushless direct current motor 3, inverter 4, LC resonance circuit 5 and DC power supply Us, the LC resonance
Circuit 5 is sequentially connected inverter 4, brushless direct current motor 3, line counter electromotive force detection circuit 2 and controller 1, the direct current
Source Us passes sequentially through LC resonance circuit 5 and inverter 4 is powered to brushless direct current motor 3.
A kind of brushless DC motor control system without position sensor, including the detection of controller 1, line counter electromotive force
Circuit 2, brushless direct current motor 3, inverter 4, LC resonance circuit 5 and DC power supply Us；Controller 1 passes through signal conditioning circuit
Connect LC resonance circuit 5 respectively and inverter 4, controller 1 are connected by signal conditioning circuit and line counter electromotive force detection circuit 2
Brushless direct current motor 3, DC power supply Us passes sequentially through LC resonance circuit 5 and inverter 4 is powered to brushless direct current motor 3,
DC power supply Us is connected by LC resonance circuit 5 with 4 circuit of three-phase inverter, the output of 4 circuit of inverter again with it is brushless straight
The supply input of galvanic electricity motivation 3 is connected.High performance controller 1 uses DSP, FPGA etc., and line counter electromotive force detection circuit 2 passes through
Detection and analysis to 3 line counter electromotive force correlative of brushless direct current motor, obtain accurate commutation signal and PWM duty cycle to drive
The normal operation of dynamic inverter 4, so as to fulfill the stable operation of brushless direct current motor；Meanwhile by the analysis of controller 1
Calculate, the control signal of auxiliary switch in LC resonance circuit 5 can also be obtained so that inverter 4 completes each commutation and PWM
During modulation, it can ensure under power switch work sofe switch pattern therein；Signal conditioning circuit is that analog signal is transformed to
For data acquisition, control process, the circuit for performing the digital signal for calculating display reading or other purposes.
Embodiment two
Specifically, a kind of brushless DC motor control system without position sensor, as shown in Fig. 2, described
Line counter electromotive force detection circuit 2 includes resistance R5, resistance R6 and resistance R7, inverter 4 access brushless direct current motor 3 before according to
Secondary branch access in parallel three resistance R5, R6 and R7, resistance R5, R6 and R7 opposite side are connected to S points.
Specifically, a kind of brushless DC motor control system without position sensor, as shown in Fig. 2, described
LC resonance circuit 5 include resistance R1, resistance R2, capacitance C1, capacitance C2, capacitance Cr, inductance Lr, thyristor Sa, thyristor Sb and
IGBT elements SL；One end connection resistance R1, the capacitance C1 of DC power supply Us and other end connection thyristor Sa, Sb of SL, SL and
Other end connection capacitance C1, C2 and resistance R1, R2 of the other end connection inductance Lr, inductance Lr of capacitance Cr, thyristor Sa, Sb,
Capacitance Cr, C2, resistance R2 are connected with the other end of DC power supply Us.
Specifically, a kind of brushless DC motor control system without position sensor, as shown in Fig. 2, described
Inverter 4 include IGBT element T1, IGBT element T2, IGBT element T3, IGBT element T4, IGBT element T5, IGBT elements T6,
Sustained diode 1, sustained diode 2, sustained diode 3, sustained diode 4, sustained diode 5 and fly-wheel diode
D6；T1 and D1, T2 and D2, T3 and D3, T4 and D4, T5 and D5, T6 and D6 are in parallel respectively, T1 and T2, T3 and T4, T5 and T6 points
Do not connect, then by T1 and T2 series arms, T3 and T4 series arms, T5 and T6 series arms, R3 and R4 series arms and electricity
It is in parallel to hold Cr, is powered by the LC resonance circuit 5.
It is one as shown in Fig. 2, being a kind of brushless DC motor control system without position sensor topology schematic diagram
As LC resonance circuit 4 is added on the basis of control system, LC resonance circuit 4 is included by a pair of of resistance R1, R2 and a pair of of capacitance
The bleeder circuit of C1, C2 composition；By 3 auxiliary switches, i.e. 1 IGBTSL and 2 high speed thyristor Sa, Sb, the control of composition
Unit；And the resonant element being made of 1 resonant inductance Lr and 1 resonant capacitance Cr.Can be by controlling auxiliary switch
Break-make, makes resonance occurs between Lr and Cr, obtains the no-voltage break-make condition of main switching device.
The inverter by six IGBT elements T1, T2, T3, T4, T5, T6 and six sustained diodes 1, D2, D3,
D4, D5, D6 are formed.T1 and D1, T2 and D2, T3 and D3, T4 and D4, T5 and D5, T6 and D6 is in parallel, then T1 and T2 is connected,
T3 and T4 series connection, T5 and T6 series connection, then by the branch circuit parallel connection of T1, T3, T5, branch and connect R3, R4 on the right side of Cr, by above
LC resonance circuit 5 power.
The line counter electromotive force detection circuit be before inverter circuit accesses motor branch three resistance R5 of access in parallel,
R6、R7.Resistance opposite side is connected to S points.
Embodiment three
As shown in figure 3, since resonant process is very short, it is constant that load current I0, which can be assumed, is equivalent to an electricity
Stream source.DC tache voltage is reduced to zero, and the process for then rising to supply voltage again is exactly one and is based on LC resonance type direct current
The process of the Zero voltage transition of Sofe Switch, this process are segmented into following several stages：1st, auxiliary switch SL is turned on, auxiliary switch
Sa, Sb end, and resonant capacitance Cr both end voltage UCr sizes are Us, and DC power supply is by SL directly to load supplying.2nd, in master
Before switch needs commutation or pwm signal saltus step, start resonance circuit work first, trigger Sa, simultaneously turn off SL, Sb appoints right work
Make in cut-off state.Resonance is occurred by Sa between resonant capacitance Cr and resonant inductance Lr, Cr is at the same time to load discharge.Work as electric discharge
After end, Sa ends naturally, and resonant capacitance Cr both end voltages UCr is equal to 0, and any action of main switching device at this time meets soft
Switching Condition, load current carry out afterflow by sustained diode.3rd, with the change for being switched on or off state of main switch,
Sb is triggered, SL, Sa still end, and Lr charges, and iLr is eventually equal to I0, and electric current is decreased to 0, D and ends naturally in D.Sb is led
Logical, SL, Sa still end, and resonance occurs by Sb between Cr and Lr, charges to Cr, UCr rises to Us.4th, triggering SL, Sa are carved
Still end, power supply is directly to load electricity.ISL is linearly increasing to I0, and iLr is then linearly reduced to 0, Sb to be ended naturally.So far, one
Transfer process terminates, and is returned to the original state of circuit.
Embodiment four
The line counter electromotive force detection circuit of the utility model uses zero crossing detection of back EMF, specific as follows：
Step a, three-phase stator winding is full symmetric, and counter electromotive force is trapezoidal wave, and flat part is equal to 120 ° of electrical angles；
Step b, the influence such as slot effect and armature-reaction is ignored；
Step c, armature winding is distributed in stator inner surface uniformly continuous；
Step d, magnetic circuit is unsaturated, disregards vortex and magnetic hystersis loss.
Then the voltage equation of three-phase windings is as follows：
Wherein, ua, ub, ucThreephase stator terminal voltage is represented successively；ia, ib, icThreephase stator electric current is represented successively；ea, eb,
ecThree phase back-emfs are represented successively；R represents stator winding resistance；L represents equivalent inductance；unThe voltage of generator neutral point is represented,
Then the equation of counter electromotive force is represented by；
The equation that outlet counter electromotive force is derived by publicity 2 is：
Wherein, uab, ubc, ucaRepresent the line voltage between three-phase windings.
Based on above formula, the oscillogram of the preferable phase back-emf of brushless direct current motor 2 and line counter electromotive force is obtained,
In one electric cycle, line back electromotive force zero-crossing coincides with the point of 30 ° of corresponding phase back-emf zero crossing and delay, this is proper
It is exactly the accurate location of motor commutation well.
Claims (4)
1. a kind of brushless DC motor control system without position sensor, it is characterised in that including controller (1), line
Counter electromotive force detection circuit (2), brushless direct current motor (3), inverter (4), LC resonance circuit (5) and DC power supply Us, institute
State LC resonance circuit (5) and be sequentially connected inverter (4), brushless direct current motor (3), line counter electromotive force detection circuit (2) and control
Device (1) processed, the DC power supply Us pass sequentially through LC resonance circuit (5) and inverter (4) and are supplied to brushless direct current motor (3)
Electricity.
A kind of 2. brushless DC motor control system without position sensor according to claim 1, it is characterised in that
The line counter electromotive force detection circuit (2) includes resistance R5, resistance R6 and resistance R7, and brushless dc is accessed in inverter (4)
Branch's access in parallel three resistance R5, R6 and R7, resistance R5, R6 and R7 opposite side are connected to S points successively before motivation (3).
3. a kind of brushless DC motor control system without position sensor according to claim 1 or claim 2, its feature exist
In the LC resonance circuit (5) includes resistance R1, resistance R2, capacitance C1, capacitance C2, capacitance Cr, inductance Lr, thyristor Sa, crystalline substance
Brake tube Sb and IGBT element SL；One end connection resistance R1, the capacitance C1 of DC power supply Us and the other end connection thyristor of SL, SL
Sa, Sb and capacitance Cr, other end connection capacitance C1, C2 and resistance of the other end connection inductance Lr, inductance Lr of thyristor Sa, Sb
R1, R2, capacitance Cr, C2, resistance R2 are connected with the other end of DC power supply Us.
A kind of 4. brushless DC motor control system without position sensor according to claim 3, it is characterised in that
The inverter (4) includes IGBT element T1, IGBT element T2, IGBT element T3, IGBT element T4, IGBT elements T5, IGBT
Element T6, sustained diode 1, sustained diode 2, sustained diode 3, sustained diode 4, sustained diode 5 and afterflow
Diode D6；T1 and D1, T2 and D2, T3 and D3, T4 and D4, T5 and D5, T6 and D6 are in parallel respectively, T1 and T2, T3 and T4, T5 and
T6 connects respectively, then by T1 and T2 series arms, T3 and T4 series arms, T5 and T6 series arms, R3 and R4 series arms
It is in parallel with capacitance Cr, powered by the LC resonance circuit (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721366851.3U CN207339693U (en) | 2017-10-23 | 2017-10-23 | A kind of brushless DC motor control system without position sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721366851.3U CN207339693U (en) | 2017-10-23 | 2017-10-23 | A kind of brushless DC motor control system without position sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207339693U true CN207339693U (en) | 2018-05-08 |
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ID=62366328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721366851.3U Expired - Fee Related CN207339693U (en) | 2017-10-23 | 2017-10-23 | A kind of brushless DC motor control system without position sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207339693U (en) |
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2017
- 2017-10-23 CN CN201721366851.3U patent/CN207339693U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180508 Termination date: 20181023 |
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| CF01 | Termination of patent right due to non-payment of annual fee |