CN102426282B - Brushless direct current motor system and torque current detection circuit thereof - Google Patents
Brushless direct current motor system and torque current detection circuit thereof Download PDFInfo
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- CN102426282B CN102426282B CN201110238624.3A CN201110238624A CN102426282B CN 102426282 B CN102426282 B CN 102426282B CN 201110238624 A CN201110238624 A CN 201110238624A CN 102426282 B CN102426282 B CN 102426282B
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Abstract
The invention provides a brushless direct current motor system and a torque current detection circuit thereof. The torque current detection circuit comprises a detection unit and an amplification and acquisition unit, wherein one end of the detection unit is connected to a connection point of the positive electrode of a direct-current power supply and diodes parallely connected with a plurality of switching tubes on an upper bridge arm of an inverter circuit; the other end of the detection unit is connected to connection points of input terminals of the plurality of switching tubes on the upper bridge arm of the inverter circuit; the amplification and acquisition unit is connected with the detection unit in parallel and is used for acquiring current which passes through the detection unit so as to obtain torque current. In the torque current detection circuit, the influence of follow current of motor winding inductance on instantaneous phase current is fully taken into consideration, so that the torque current in a motor winding is accurately detected; and the circuit is easy to implement and the universality is high.
Description
Technical field
The present invention relates to brushless direct current motor technical field, particularly relate to a kind of brushless direct current motor system and brushless direct current motor torque current testing circuit thereof.
Background technology
At present, three-phase brushless DC motor adopts the method detecting phase current instantaneous value or bus current instantaneous value to realize producing in motor winding the electric current of moment (namely usually, torque current) closed-loop control, thus effectively suppress the torque ripple of brushless direct current motor.Wherein, phase current instantaneous value method needs 3 independently current sensor and current regulators, circuit redundancy, and software simulating is complicated; Bus current instantaneous value method have ignored the afterflow effect of motor winding inductance, circulation in freewheel current is formed in inverter circuit and motor winding, cannot be detected by the current sensor be installed on bus.
For above problem, for the lower brachium pontis switch modulation mode of the inverter circuit of brushless direct current motor system in " brushless direct current motor New type of current detection method " that people such as meeting the lattice people was published on " micromotor " the 1st phase in 2010, propose a kind of advantageous torque current detecting topological structure as shown in Figure 1.As shown in Figure 1, this torque current detects topological structure between direct supply and inverter circuit, adds two coil L
1and L
2, the torque current of detection is i=i
1+ i
2, wherein, i
1and i
2be respectively and flow through coil L
1and L
2electric current.This topological structure can detect electric current torque current simply and effectively, and then realizes the closed-loop control of electric current, thus can effectively suppress motor torque to fluctuate.But, self inductance effect due to inductance itself can affect the size of current of electric, and this detects electric current cannot collect ECU (electronic control unit) by collection value in real time, therefore adopt inductance torque current accuracy of detection can be caused not high enough to current of electric detection, the electric current of motor bus can not be reflected in real time.
Summary of the invention
In order to solve the problem, the invention provides a kind of brushless direct current motor system and brushless direct current motor torque current testing circuit thereof, to detect the torque current in motor winding more simply, more accurately.
In order to realize above object, the invention provides a kind of brushless direct current motor torque current testing circuit for brushless direct current motor system, described brushless direct current motor system comprises direct supply, inverter circuit and brushless direct current motor, it is characterized in that, described torque current testing circuit comprises: detecting unit, its one end is connected to the tie point of the parallel diode of multiple switching tubes of the positive pole of described direct supply and the upper brachium pontis of described inverter circuit, and the other end is connected to the tie point of the input terminal of multiple switching tubes of the upper brachium pontis of described inverter circuit; Amplify collecting unit, it is in parallel with described detecting unit, for gathering the electric current by detecting unit, to obtain the torque current of described brushless direct current motor.
Preferably, described detecting unit is a resistance.
Preferably, described amplification collecting unit is AD8210 chip.
Preferably, described torque current testing circuit also comprises: filter unit, its be connected to described amplification collecting unit and for control described brushless direct current motor ECU between.In this case, described amplification collecting unit amplifies the voltage at described detecting unit two ends, and described filter unit carries out filtering to the voltage amplified by described amplification collecting unit, and the voltage of filtering is outputted to ECU.
Preferably, described filter unit is RC wave filter.
In addition, the invention provides corresponding brushless direct current motor system, it comprises above-mentioned torque current testing circuit.
Brushless direct current motor torque current testing circuit provided by the present invention has taken into full account the impact of freewheel current on instantaneous phase currents of motor winding inductance, thus accurately detects the torque current in motor winding, and realizing circuit is simple, and versatility is better.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the brushless direct current motor system of prior art;
Fig. 2 is the circuit diagram of the brushless direct current motor system comprising brushless direct current motor torque current testing circuit of the present invention;
Fig. 3 is the circuit diagram of the brushless direct current motor system of the brushless direct current motor torque current testing circuit comprising the embodiment of the present invention.
Embodiment
Below, present invention is described with embodiment with reference to the accompanying drawings.
Fig. 2 is the circuit diagram of the brushless direct current motor system comprising brushless direct current motor torque current testing circuit of the present invention.As shown in Figure 2, this brushless direct current motor system comprises motor drive module, brushless direct current motor and brushless direct current motor torque current testing circuit provided by the invention, wherein, motor drive module comprises direct supply U and inverter circuit, and inverter circuit is made up of switching tube Kt1-Kt6 and sustained diode 1-D6; Brushless direct current motor comprises three winding inductances, adopts the control mode of three-phase six-beat conducting between two.Here, motor drive module and brushless direct current motor all belong to prior art, therefore omit it herein and describe in detail.Below, will be described in detail brushless direct current motor torque current testing circuit provided by the invention.
Brushless direct current motor torque current testing circuit provided by the invention comprises detecting unit and amplifies collecting unit, wherein, one end of detecting unit is connected to the tie point of the parallel diode of multiple switching tubes of the positive pole of direct supply U and the upper brachium pontis of inverter circuit, and the other end is connected to the tie point of the input terminal of multiple switching tubes of the upper brachium pontis of inverter circuit; Amplifying collecting unit in parallel with detecting unit, for detecting the electric current I 2 by detecting unit, wherein, being the motor torque electric current that will detect by the electric current I 2 of detecting unit.
In addition, brushless direct current motor torque current testing circuit provided by the invention also can comprise filter unit, its be connected to amplify collecting unit and for control brushless direct current motor ECU between.In this case, amplify the voltage that collecting unit amplifies described detecting unit two ends, filter unit carries out filtering to the voltage amplified by amplifying collecting unit, and the voltage of filtering is outputted to ECU (particularly, the AD end of ECU).Here, because ECU belongs to the technology of well known to a person skilled in the art, therefore the descriptions thereof are omitted.
Brushless direct current motor torque current testing circuit according to an embodiment of the invention is shown in Fig. 3.In the present embodiment, detecting unit is for detecting resistance R4, and amplify collecting unit and adopt AD8210 chip (well-known device), filter unit adopts RC wave filter.By detecting the electric current I 2=I1+I3 of resistance R4, wherein, I1 is the drive current that direct supply U exports, I3 be motor winding inductance the electric current I a, Ib and Ic that produce through the freewheel current of upper brachium pontis fly-wheel diode, wherein the direction of electric current I 1, I2 and I3 with the direction shown in Fig. 2 for positive dirction.It should be noted that, when there being freewheel current, I3 is non-vanishing, and when not having freewheel current, I3 is zero.
Below, be divided into non-commutation moment and commutation moment that the testing process of motor torque electric current is described respectively in each phase winding electric current.
As shown in Figure 2, suppose that the transfer sequence of brushless direct current motor is followed successively by AB → AC → BC → BA → CA → CB → AB, arranging switching tube Kt1, Kt3, Kt5 has a switching tube to be in conducting state at any time all the time, makes motor drive module effectively drive brushless direct current motor like this.In embodiments of the present invention, the testing process of torque current is described for switching tube Kt1 conducting all the time.
(1) in the testing process of non-commutation moment motor torque electric current
When AB state, switching tube Kt1 conducting all the time, now, under current return, brachium pontis switching tube Kt6 can be divided into conducting (PWM_ON) and (PWM_OFF) two kinds of situations of shutoff.
1, when Kt6 is in PWM_ON
When switching tube Kt1 conducting, Kt6 conducting, current return forms closed loop through I1, Kt1, A phase winding, B phase winding, Kt6.Now, by the electric current I c=0 of the current Ib=-I1 of the electric current I a=I1 of motor A phase winding, B phase winding, C phase winding, be namely I2=I1 (I3=0) by detecting the electric current of resistance R4.
2, when Kt6 is in PWM_OFF
When switching tube Kt1 conducting, Kt6 turn off, current return forms closed loop through I2, Kt1, A phase winding, B phase winding, sustained diode 3, I3.Now, Ia=I2, Ib=-I2, Ic=0 are I2=I3 (I1=0) by detecting the electric current of resistance R4.
Therefore, in the non-commutation moment, be I1 by the electric current I 2 that detects resistance R4 when PWM_ON state, be I3 when PWM_OFF state, the electric current I 2 namely by detecting resistance R4 reflects the torque current of motor in real time.
(2) in the testing process of commutation moment motor torque electric current
Analyze to AC State Commutation for AB state, switching tube Kt1 conducting all the time, when commutation, B phase winding electric current can not reduce to zero instantaneously, but carries out afterflow by diode D3.Now, under current return, brachium pontis can be divided into switching tube Kt2 conducting (PWM_ON) and (PWM_OFF) two kinds of situations of shutoff.
1, when Kt2 is in PWM_ON
Have two current returns when Kt2 is in PWM_ON, wherein, a current return forms current closed-loop through I1, switching tube Kt1, winding A, winding C, switching tube Kt2; Other one is continuous current circuit, forms closed loop through winding B, diode D3, I3, switching tube Kt1, winding A, is now I2=I1+I3 by detecting the electric current of resistance R4.
2, when Kt2 is in PWM_OFF
Also have two current returns when Kt2 is in PWM_OFF, wherein, one forms current closed-loop through winding C, diode D5, I3, switching tube Kt1, winding A, and this loop is C phase afterflow ring; Another is continuous current circuit, forms current closed-loop through winding B, diode D3, I3, switching tube Kt1, winding A, and this loop is V phase afterflow ring.Be now I2=I3 (I1=0) by detecting the electric current of resistance R4.
Therefore in the commutation moment, no matter be PWM_ON or PWM_OFF state, reflected the torque current of motor in real time by the electric current detecting resistance R4, and acquisition precision be higher.
Here point out, adopt resistance as detecting unit in the present embodiment, therefore compared with the torque current testing circuit shown in Fig. 1, the self inductance effect do not existed due to inductance itself can affect the problem of the size of current of electric, therefore, in real time collection value can be collected ECU, and torque current accuracy of detection is high, also can reflects the electric current of motor bus in real time.In addition, owing to make use of AD8210, so the precision detected is higher, more real time reaction the electric current of motor bus can be gone out.
Below with reference to drawings and Examples to invention has been detailed description, but should be appreciated that, the present invention is not limited to above disclosed exemplary embodiment.Claim should be given to explain the most widely, to contain all modification of disclosed exemplary embodiment, equivalent structure and function.Such as, except detecting resistance R4, described detecting unit can also be special current collection circuit; Amplify the amplification acquisition chip that collecting unit can also take other known different accuracy; Filter unit can gather special filtering chip.
Claims (5)
1. for a brushless direct current motor torque current testing circuit for brushless direct current motor system, described brushless direct current motor system comprises direct supply, inverter circuit and brushless direct current motor, it is characterized in that, described torque current testing circuit comprises:
Detecting unit, described detecting unit is a resistance, this resistance one end is connected to the tie point of the parallel diode of multiple switching tubes of the positive pole of described direct supply and the upper brachium pontis of described inverter circuit, and the other end is connected to the tie point of the input terminal of multiple switching tubes of the upper brachium pontis of described inverter circuit; Wherein, there are two kinds of situations in the commutation moment by the electric current of described detecting unit, a kind of situation comprises two parts, the drive current that a part exports for direct supply, another part be the electric current that produces of motor winding inductance through the freewheel current of upper brachium pontis fly-wheel diode, the electric current of described detecting unit be above-mentioned two-part and; Another kind of situation is that the electric current of detecting unit equals electric current that motor winding inductance the produces freewheel current through upper brachium pontis fly-wheel diode;
Amplify collecting unit, it is in parallel with described detecting unit, for gathering the electric current by detecting unit, to obtain the torque current of described brushless direct current motor.
2. brushless direct current motor torque current testing circuit according to claim 1, is characterized in that, described amplification collecting unit is AD8210 chip.
3. brushless direct current motor torque current testing circuit according to claim 1, is characterized in that, also comprise:
Filter unit, its be connected to described amplification collecting unit and for control described brushless direct current motor electronic control unit between,
Described amplification collecting unit amplifies the voltage at described detecting unit two ends, and described filter unit carries out filtering to the voltage amplified by described amplification collecting unit, and the voltage of filtering is outputted to described electronic control unit.
4. brushless direct current motor torque current testing circuit according to claim 3, is characterized in that, described filter unit is RC wave filter.
5. a brushless direct current motor system, comprises the brushless direct current motor torque current testing circuit according to any one in claim 1-4.
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|---|---|---|---|
| CN201110238624.3A CN102426282B (en) | 2011-08-18 | 2011-08-18 | Brushless direct current motor system and torque current detection circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110238624.3A CN102426282B (en) | 2011-08-18 | 2011-08-18 | Brushless direct current motor system and torque current detection circuit thereof |
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| CN102426282A CN102426282A (en) | 2012-04-25 |
| CN102426282B true CN102426282B (en) | 2015-01-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104678163A (en) * | 2014-12-30 | 2015-06-03 | 东南大学 | Direct-current motor winding current sampling circuit and sampling method thereof |
| CN108900118A (en) * | 2018-08-13 | 2018-11-27 | 魏海峰 | A kind of brshless DC motor commutation current control method |
| CN109975648A (en) * | 2019-04-24 | 2019-07-05 | 重庆理工大学 | A kind of motor bridge circuit power switch tube short circuit online test method |
| CN113829894A (en) * | 2021-10-29 | 2021-12-24 | 重庆长安新能源汽车科技有限公司 | Pulse current determination method and system in high-frequency pulse heating process of power battery |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101001075A (en) * | 2006-01-11 | 2007-07-18 | 海尔集团公司 | Torque control device and method of DC variable frequency compressor |
| CN101076939A (en) * | 2004-10-07 | 2007-11-21 | Trw有限公司 | Motor drive control |
| CN101272114A (en) * | 2007-03-22 | 2008-09-24 | 海尔集团公司 | Frequency conversion control device of DC motor |
| CN102013827A (en) * | 2007-01-15 | 2011-04-13 | 深圳航天科技创新研究院 | Inverter module for controlling brushless direct current (DC) motor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2910177B2 (en) * | 1990-07-05 | 1999-06-23 | 松下電器産業株式会社 | Motor drive |
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- 2011-08-18 CN CN201110238624.3A patent/CN102426282B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101076939A (en) * | 2004-10-07 | 2007-11-21 | Trw有限公司 | Motor drive control |
| CN101001075A (en) * | 2006-01-11 | 2007-07-18 | 海尔集团公司 | Torque control device and method of DC variable frequency compressor |
| CN102013827A (en) * | 2007-01-15 | 2011-04-13 | 深圳航天科技创新研究院 | Inverter module for controlling brushless direct current (DC) motor |
| CN101272114A (en) * | 2007-03-22 | 2008-09-24 | 海尔集团公司 | Frequency conversion control device of DC motor |
Non-Patent Citations (2)
| Title |
|---|
| JP平4-67791A 1992.03.03 * |
| 无刷直流电动机新型电流检测方法;逄格民 等;《微电机》;20101231;第43卷(第1期);第91-93页 * |
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