CN204794776U - Brushless no hall motor -drive circuit - Google Patents
Brushless no hall motor -drive circuit Download PDFInfo
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- CN204794776U CN204794776U CN201520518356.4U CN201520518356U CN204794776U CN 204794776 U CN204794776 U CN 204794776U CN 201520518356 U CN201520518356 U CN 201520518356U CN 204794776 U CN204794776 U CN 204794776U
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Abstract
The utility model discloses a brushless no hall motor -drive circuit, including singlechip, two buttons, with the three -phase circuit that brushless motor connects is with the electric current detection circuit who is connected of three -phase circuit, with the inside circuit connection's of motor back electromotive force detection circuitry, singlechip, three -phase circuit and motor internal circuit electricity are in proper order connected, and back electromotive force detection circuitry's output, electric current detection circuitry's output and 2 buttons all are connected with the monolithic is electromechanical. The utility model has the characteristics of guarantee the reliable control of motor, prolonged the life of motor.
Description
Technical field
The utility model relates to brushless electric machine control technology field, especially relates to a kind of structure simple, controls more accurate, accelerates brushless Hall-free motor-drive circuit faster.
Background technology
Change along with audio-visual products " little, light, thin " and the mute of household appliances and luxury models demand increase, brushless DC motor requirement increases sharply.Brshless DC motor electronic commutation instead of brush and commutator, has highly reliable, high efficiency, life-span length, speed governing advantage easily.
Brushless electric machine with Hall element exists Hall element easily to be damaged, and wiring quantity is more, can not adapt to high temperature or wet environment, the shortcoming that complete machine cost is higher.
Chinese patent mandate publication number: CN203675019U, authorize publication date on June 25th, 2014, disclose a kind of driving circuit of brushless electric machine, the brushless electric machine comprising single-chip microcomputer, brushless electric machine drive plate and be connected with brushless electric machine drive plate, also comprise the brushless electric machine speed-regulating control circuit, brushless electric machine positive and reverse rotation control circuit and the brushless electric machine power supply circuits that are connected with brushless electric machine drive plate with single-chip microcomputer, described brushless electric machine speed-regulating control circuit is output circuit pulse width modulating signal being changed into analog voltage signal; Brushless electric machine positive and reverse rotation control circuit utilizes single chip machine controlling circuit break-make, and what realize motor rotates and reverse commutation function; Brushless electric machine power supply circuits utilize single chip machine controlling circuit break-make, promote the on-off function of power supply circuits through triode and two-stage metal-oxide-semiconductor.The weak point of this invention is, circuit cannot be revised, and is unfavorable for the updating and upgrading of a product.
Summary of the invention
Goal of the invention of the present utility model can not adapt to high temperature or wet environment, the deficiency that complete machine cost is higher in order to what overcome drive unit of the prior art, provides a kind of structure simple, controls more accurate, accelerate brushless Hall-free motor-drive circuit faster.
To achieve these goals, the utility model is by the following technical solutions:
A kind of brushless Hall-free motor-drive circuit, comprises single-chip microcomputer, two buttons, the three-phase circuit be connected with described brushless electric machine, the current detection circuit be electrically connected with three-phase circuit, the counter electromotive force detection circuit be connected with motor internal circuit; Single-chip microcomputer, three-phase circuit and motor internal circuit are electrically connected successively, and the output of counter electromotive force detection circuit, the output of current detection circuit and 2 buttons are all electrically connected with single-chip microcomputer.
Current detection circuit is used for the current detecting of motor, and for controlling, motor accelerates single-chip microcomputer, stable operation, improves the reliability and stability of motor.
The utility model adopts counter electromotive force detection circuit to measure back electromotive force, structure is simple, and convenience of calculation, has saved hardware cost, adopt the method for zero passage and commutation to control motor to accelerate and stable operation, do not need wait 30 degree of angle commutations again, motor is run and controls more accurately, to accelerate faster, iteration optimization algorithms is have employed in commutation calculates, reduce back electromotive force error, improve the angle precision of commutation, ensure that the accurate of commutation and stability.
Simple circuit of the present utility model, makes motor adapt to different application scenarios by update routine, is convenient to the upgrading of product; Can detect and judge the fault that motor runs voluntarily, the fault that self-healing part non-hardware is damaged, ensure that the reliable control of motor, extend the useful life of motor, be conducive to manufacturer and product is optimized further.
Therefore, the utility model has simple circuit, is convenient to upgrading, starter motor that can be rapid and stable, complete monitoring motor is from the whole process starting to stopping, and motor speed is high, stable, can detect and judge the fault that motor runs voluntarily, the fault that self-healing part non-hardware is damaged, ensure that the reliable control of motor, extends the feature in the useful life of motor.
As preferably, described counter electromotive force detection circuit comprises 6 resistance Rp and 3 the electric capacity Cn for filtering high fdrequency component; Wherein, 3 resistance Rp one end are electrically connected with A, B and C of motor internal circuit respectively, and the other end is all electrically connected with a pin of single-chip microcomputer; Other 3 resistance Rp one end are electrically connected with A, B and C of motor internal circuit respectively, and the other end is electrically connected with 3 pins of single-chip microcomputer respectively; 3 electric capacity Cn one end are all electrically connected with A, B and C of motor internal circuit, 3 equal ground connection of the electric capacity Cn other end.
As preferably, described current detection circuit comprises resistance R9, resistance R10, resistance R11 and resistance R12, electric capacity C2 and electric capacity C3, amplifier D2; Resistance R9 one end is electrically connected with three-phase circuit, the resistance R9 other end is electrically connected with the in-phase input end of amplifier D2, resistance R11 one end, electric capacity C2 one end, resistance R12 one end and electric capacity C3 one end respectively, resistance R10 mono-termination 3V voltage, the resistance R10 other end is electrically connected with the inverting input of amplifier D2, the resistance R11 other end and the electric capacity C2 other end all connect 0.3V voltage, the resistance R12 other end and the electric capacity C3 other end are all electrically connected with the output of amplifier D2, and the output of amplifier D2 is electrically connected with single-chip microcomputer.
As preferably, also comprise resistance R14 and amplifier D3; The output of amplifier D2 is electrically connected with the reverse phase input of amplifier D3, and the in-phase input end of amplifier D3 is connected with 1.6V voltage, and the output of amplifier D3 is electrically connected with single-chip microcomputer.
As preferably, described three-phase circuit comprises 6 field effect transistor, resistance R13, electric capacity C4 and electric capacity C5; 6 field effect transistor are respectively field effect transistor M1, field effect transistor M2, field effect transistor M3, field effect transistor M4, field effect transistor M5 and field effect transistor M6; 6 field effect transistor are all electrically connected with brushless electric machine, field effect transistor M2, field effect transistor M4 and field effect transistor M6 are all by resistance R13 ground connection, electric capacity C4 and electric capacity C5 one end are all electrically connected with field effect transistor M1, field effect transistor M3 and field effect transistor M5, electric capacity C4 and electric capacity C5 other end ground connection.
As preferably, the model of single-chip microcomputer is 89C52.
Therefore, the utility model has following beneficial effect: simple circuit, be convenient to upgrading, starter motor that can be rapid and stable, complete monitoring motor is from the whole process starting to stopping, and motor speed is high, stable, can detect and judge the fault that motor runs voluntarily, the fault that self-healing part non-hardware is damaged, ensure that the reliable control of motor, extends the useful life of motor.
Accompanying drawing explanation
Fig. 1 is a kind of circuit diagram of three-phase circuit of the present utility model and current detection circuit;
Fig. 2 is a kind of circuit diagram of single-chip microcomputer of the present utility model and button;
Fig. 3 is a kind of circuit diagram of motor internal circuit of the present utility model and counter electromotive force detection circuit;
Fig. 4 is a kind of schematic diagram that PWM of the present utility model becomes acceleration wave.
In figure: single-chip microcomputer 1, button 2, three-phase circuit 3, current detection circuit 4, motor internal circuit 5, counter electromotive force detection circuit 6, motor 7.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is further described.
Embodiment is as shown in Figure 1 and Figure 2 a kind of brushless Hall-free motor-drive circuit, comprise single-chip microcomputer 1, two buttons 2, the three-phase circuit 3 be connected with motor 7, the current detection circuit 4 be electrically connected with three-phase circuit, the counter electromotive force detection circuit 6 be connected with the motor internal circuit 5 shown in Fig. 3; Single-chip microcomputer, three-phase circuit and motor internal circuit are electrically connected successively, and the output of counter electromotive force detection circuit, the output of current detection circuit and 2 buttons are all electrically connected with single-chip microcomputer.Current detection circuit comprises resistance R9, resistance R10, resistance R11 and resistance R12, electric capacity C2 and electric capacity C3, amplifier D2; Resistance R9 one end is electrically connected with three-phase circuit, the resistance R9 other end is electrically connected with the in-phase input end of amplifier D2, resistance R11 one end, electric capacity C2 one end, resistance R12 one end and electric capacity C3 one end respectively, resistance R10 mono-termination 3V voltage, the resistance R10 other end is electrically connected with the inverting input of amplifier D2, the resistance R11 other end and the electric capacity C2 other end all connect 0.3V voltage, the resistance R12 other end and the electric capacity C3 other end are all electrically connected with the output of amplifier D2, and the output of amplifier D2 is electrically connected with single-chip microcomputer.
Also comprise resistance R14 and amplifier D3; The output of amplifier D2 is electrically connected with the reverse phase input of amplifier D3, and the in-phase input end of amplifier D3 is connected with 1.6V voltage, and the output of amplifier D3 is electrically connected with single-chip microcomputer.
Three-phase circuit comprises 6 field effect transistor, resistance R13, electric capacity C4 and electric capacity C5; 6 field effect transistor are respectively field effect transistor M1, field effect transistor M2, field effect transistor M3, field effect transistor M4, field effect transistor M5 and field effect transistor M6; 6 field effect transistor are all electrically connected with brushless electric machine, field effect transistor M2, field effect transistor M4 and field effect transistor M6 are all by resistance R13 ground connection, electric capacity C4 and electric capacity C5 one end are all electrically connected with field effect transistor M1, field effect transistor M3 and field effect transistor M5, electric capacity C4 and electric capacity C5 other end ground connection.The model of single-chip microcomputer is 89C52.
As shown in Figure 3, counter electromotive force detection circuit comprises 6 resistance Rp and 3 the electric capacity Cn for filtering high fdrequency component; Wherein, 3 resistance Rp one end are electrically connected with A, B and C of motor internal circuit respectively, and the other end is all electrically connected with a pin of single-chip microcomputer; Other 3 resistance Rp one end are electrically connected with A, B and C of motor internal circuit respectively, and the other end is electrically connected with 3 pins of single-chip microcomputer respectively; 3 electric capacity Cn one end are all electrically connected with A, B and C of motor internal circuit, 3 equal ground connection of the electric capacity Cn other end.
The course of work of the present utility model is as follows:
Step 100, electric motor starting
Be provided with PWM that wave period reduces gradually in the register of single-chip microcomputer and become acceleration wave and the constant PWM neutral wave of wave period, motor pole logarithm p, motor rotating speed of target n, the cycle t0 corresponding with rotating speed of target, wherein
it is all corresponding with the phase conduction state that 6 are arranged in order with the waveform of PWM neutral wave that PWM becomes acceleration wave; Two buttons are respectively and start button and close button; Work as n=12000, during p=1, then
millisecond.
As shown in Figure 4, the phase conduction state that PWM becomes acceleration wave and PWM neutral wave is followed successively by that AB is conducted, AC is conducted, BC is conducted, BA is conducted, CA is conducted and CB is conducted, AB is conducted, AC is conducted, BC is conducted, BA is conducted, CA is conducted and CB is conducted respectively with the corner 0 to 60 ° of rotor, 60 ° to 120 °, 120 ° to 180 °, 180 ° to 240 °, 240 ° to 300 °, 300 ° corresponding successively to 360 °;
Step 200, motor stabilizing accelerates
Step 210, as shown in Figure 3, single-chip microcomputer per interval T1=1 millisecond, the back electromotive force V that counter electromotive force detection circuit detects is read in circulation
ywith three-phase separate voltage U A2, UB2 and UC2;
For each back electromotive force V read
yall be handled as follows with three-phase separate voltage U A2, UB2 and UC2:
Single-chip microcomputer becomes according to current PWM the phase place that acceleration wave knows current conducting;
When AB phase or BA are conducted, single-chip microcomputer utilizes formula
| Δ E
c|=V
y+ UA2+UB2-2UC2 calculates the absolute value of back electromotive force difference | Δ E
c|;
When CB phase or BC are conducted, single-chip microcomputer utilizes formula
| Δ E
a|=V
y+ UC2+UB2-2UA2 calculates the absolute value of back electromotive force difference | Δ E
a|;
When AC phase or CA are conducted, single-chip microcomputer utilizes formula | Δ E
b|=V
y+ UC2+UA2-2UB2 calculates the absolute value of back electromotive force difference | Δ E
b|;
Store side-play amount threshold value e in register, the absolute value of setting back electromotive force difference is | Δ Ex|, wherein, | Δ Ex| is | Δ E
a|, | Δ E
b| or | Δ E
c|, setting iterative increment is Δ u (k); E=20 millisecond, Δ u (k) is-0.2 millisecond.
(7-1) single-chip microcomputer utilizes formula | Δ Ex| '=| Δ Ex|+ Δ u (k) calculates | and Δ Ex| ', then makes | Δ Ex|=| Δ Ex| ';
(7-2) step (7-1) is returned, until | Δ Ex| '≤e, makes | Δ Ex|=| Δ Ex| ';
Step 220, single-chip microcomputer utilizes formula
calculate each moment b
1angle of overlap α, as α ∈ [A1, A2], the PWM that Single-chip Controlling exports becomes acceleration wave commutation; The b1 moment of each commutation is stored in register by single-chip microcomputer;
Wherein, k is the constant of setting, ω and b
1the PWM in moment becomes acceleration wave frequency and is directly proportional; | Δ Ex| is | Δ E
a|, | Δ E
b| or | Δ E
c|, A1, A2 are the commutation angular range upper limit value and lower limit value of setting;
As shown in Figure 4, A, B and C are respectively the voltage waveform that single-chip microcomputer flows to A, B and C of three-phase circuit, and the AB that abscissa marks represents that AB is conducted, AC represents that AC is conducted, BC represents that BC is conducted, BA represents that BA is conducted, CA represents that CA is conducted and CB represents that CB is conducted;
If current time PWM becomes being conducted into AB corresponding to acceleration wave, the next waveform exported should be the corresponding waveform that is conducted with AC, but the angle of overlap α ∈ [A1 of current time, A2], then the direct saltus step of waveform that the Single-chip Controlling next one exports is that AC is conducted corresponding waveform.A1＝29.67°，B1＝30.23°。
Step 300, the stable operation of motor
Single-chip microcomputer reads the moment b of continuous 7 commutations
11, b
12..., b
17, utilize formula t '=b
17-b
11calculate current cycle t ', as t '≤t
0, then Single-chip Controlling exports PWM neutral wave; Repeat step 200, utilize angle of overlap α to control motor stabilizing and run.
PWM becomes acceleration and is gradually varied to t0 from 200 milliseconds wave period, in order to not cause step-out phenomenon, setting PWM change accelerates wave period in 200 milliseconds to 100 milliseconds change procedures, gradually changes to 100 milliseconds by 200 milliseconds, 180 milliseconds, 160 milliseconds, 140 milliseconds, 120 milliseconds;
PWM change accelerates wave period in 100 milliseconds to 0 millisecond change procedures, gradually changes to 40 milliseconds by 100 milliseconds, 90 milliseconds, 80 milliseconds, 70 milliseconds, 60 milliseconds, 50 milliseconds;
PWM become accelerate wave period at 40 milliseconds in t0 change procedure, change successively at interval of 5 milliseconds.PWM becomes the setting at mechanical periodicity interval of acceleration wave, effectively avoids interval variation too fast and the appearance of motor desynchronizing situation that causes.T is 2 milliseconds.The present invention is mainly used in the personal care products such as shaver.
Should be understood that the present embodiment is only not used in restriction scope of the present utility model for illustration of the utility model.In addition should be understood that those skilled in the art can make various changes or modifications the utility model, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the utility model instruction.
Claims (6)
1. a brushless Hall-free motor-drive circuit, it is characterized in that, comprise single-chip microcomputer (1), two buttons (2), the three-phase circuit (3) be connected with described brushless electric machine, the current detection circuit (4) be electrically connected with three-phase circuit, the counter electromotive force detection circuit (6) be connected with motor internal circuit (5); Single-chip microcomputer, three-phase circuit and motor internal circuit are electrically connected successively, and the output of counter electromotive force detection circuit, the output of current detection circuit and 2 buttons are all electrically connected with single-chip microcomputer.
2. brushless Hall-free motor-drive circuit according to claim 1, is characterized in that, described counter electromotive force detection circuit comprises 6 resistance Rp and 3 the electric capacity Cn for filtering high fdrequency component; Wherein, 3 resistance Rp one end are electrically connected with A, B and C of motor internal circuit respectively, and the other end is all electrically connected with a pin of single-chip microcomputer; Other 3 resistance Rp one end are electrically connected with A, B and C of motor internal circuit respectively, and the other end is electrically connected with 3 pins of single-chip microcomputer respectively; 3 electric capacity Cn one end are all electrically connected with A, B and C of motor internal circuit, 3 equal ground connection of the electric capacity Cn other end.
3. brushless Hall-free motor-drive circuit according to claim 1, is characterized in that, described current detection circuit comprises resistance R9, resistance R10, resistance R11 and resistance R12, electric capacity C2 and electric capacity C3, amplifier D2; Resistance R9 one end is electrically connected with three-phase circuit, the resistance R9 other end is electrically connected with the in-phase input end of amplifier D2, resistance R11 one end, electric capacity C2 one end, resistance R12 one end and electric capacity C3 one end respectively, resistance R10 mono-termination 3V voltage, the resistance R10 other end is electrically connected with the inverting input of amplifier D2, the resistance R11 other end and the electric capacity C2 other end all connect 0.3V voltage, the resistance R12 other end and the electric capacity C3 other end are all electrically connected with the output of amplifier D2, and the output of amplifier D2 is electrically connected with single-chip microcomputer.
4. brushless Hall-free motor-drive circuit according to claim 3, is characterized in that, also comprises resistance R14 and amplifier D3; The output of amplifier D2 is electrically connected with the reverse phase input of amplifier D3, and the in-phase input end of amplifier D3 is connected with 1.6V voltage, and the output of amplifier D3 is electrically connected with single-chip microcomputer.
5. brushless Hall-free motor-drive circuit according to claim 1, is characterized in that, described three-phase circuit comprises 6 field effect transistor, resistance R13, electric capacity C4 and electric capacity C5; 6 field effect transistor are respectively field effect transistor M1, field effect transistor M2, field effect transistor M3, field effect transistor M4, field effect transistor M5 and field effect transistor M6; 6 field effect transistor are all electrically connected with brushless electric machine, field effect transistor M2, field effect transistor M4 and field effect transistor M6 are all by resistance R13 ground connection, electric capacity C4 and electric capacity C5 one end are all electrically connected with field effect transistor M1, field effect transistor M3 and field effect transistor M5, electric capacity C4 and electric capacity C5 other end ground connection.
6. the brushless Hall-free motor-drive circuit according to claim 1 or 2 or 3 or 4 or 5, it is characterized in that, the model of single-chip microcomputer is 89C52.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520518356.4U CN204794776U (en) | 2015-07-16 | 2015-07-16 | Brushless no hall motor -drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520518356.4U CN204794776U (en) | 2015-07-16 | 2015-07-16 | Brushless no hall motor -drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204794776U true CN204794776U (en) | 2015-11-18 |
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|---|---|---|---|
| CN201520518356.4U Expired - Fee Related CN204794776U (en) | 2015-07-16 | 2015-07-16 | Brushless no hall motor -drive circuit |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208841A (en) * | 2016-08-30 | 2016-12-07 | 上海德麦电子科技有限公司 | A kind of sinusoidal control device without DC brushless motor suddenly |
-
2015
- 2015-07-16 CN CN201520518356.4U patent/CN204794776U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208841A (en) * | 2016-08-30 | 2016-12-07 | 上海德麦电子科技有限公司 | A kind of sinusoidal control device without DC brushless motor suddenly |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151118 Termination date: 20160716 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |