CN102426282A - 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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- CN102426282A CN102426282A CN2011102386243A CN201110238624A CN102426282A CN 102426282 A CN102426282 A CN 102426282A CN 2011102386243 A CN2011102386243 A CN 2011102386243A CN 201110238624 A CN201110238624 A CN 201110238624A CN 102426282 A CN102426282 A CN 102426282A
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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 the brushless direct current motor technical field, relate in particular to a kind of brushless direct current motor system and brushless direct current motor torque current testing circuit thereof.
Background technology
At present; The electric current that the method that detects phase current instantaneous value or bus current instantaneous value that three-phase brushless DC motor adopts usually realizes producing in the motor windings moment (promptly; Torque current) closed-loop control, thus the torque ripple of brushless direct current motor suppressed effectively.Wherein, phase current instantaneous value method needs 3 independently current sensor and current regulators, and circuit is redundant, and software is realized complicated; Bus current instantaneous value method has been ignored the afterflow effect of motor winding inductance, and circulation in freewheel current forms in inverter circuit and motor winding can't be through being installed on the current sensor senses on the bus.
To above problem; Be published in the following brachium pontis switch modulation mode that is directed against the inverter circuit of brushless direct current motor system in " the brushless direct current motor New type of current detection method " on " micromotor " 2010 the 1st phases people such as meeting the lattice people, proposed 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 has increased by two coil L between direct supply and inverter circuit
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 the electric current torque current simply and effectively, and then realizes the closed-loop control of electric current, thereby can suppress the motor torque fluctuation effectively.But; Because the self inductance effect of inductance itself can influence the size of current of electric; And this detects electric current can't collect ECU (electronic control unit) with the collection value in real time; So adopt inductance can cause that to the current of electric detection torque current accuracy of detection is not high enough, can not reflect the electric current of motor bus in real time.
Summary of the invention
In order to address the above problem, the present 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 the motor windings more simply, more accurately.
In order to realize above purpose; The present invention provides a kind of brushless direct current motor torque current testing circuit that is used for brushless direct current motor system; Said brushless direct current motor system comprises direct supply, inverter circuit and brushless direct current motor; It is characterized in that; Said torque current testing circuit comprises: detecting unit, one of which end are connected to the tie point of parallel diode of a plurality of switching tubes of last brachium pontis of positive pole and the said inverter circuit of said direct supply, and the other end is connected to the tie point of input terminal of a plurality of switching tubes of the last brachium pontis of said inverter circuit; Amplify collecting unit, it is parallelly connected with said detecting unit, is used to gather the electric current through detecting unit, to obtain the torque current of said brushless direct current motor.
Preferably, said detecting unit is a resistance.
Preferably, said amplification collecting unit is the AD8210 chip.
Preferably, said torque current testing circuit also comprises: filter unit, it is connected said amplification collecting unit and is used to control between the ECU of said brushless direct current motor.In this case, said amplification collecting unit amplifies the voltage at said detecting unit two ends, and said filter unit carries out filtering to the voltage that amplifies through said amplification collecting unit, and the voltage of filtering is outputed to ECU.
Preferably, said filter unit is the RC wave filter.
In addition, the present invention provides corresponding brushless direct current motor system, and 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 influence of the freewheel current of motor winding inductance to instantaneous phase current, thereby accurately detects the torque current in the motor windings, and realizes that circuit is simple, and versatility is better.
Description of drawings
Fig. 1 is the circuit diagram of the brushless direct current motor system of prior art;
Fig. 2 is the circuit diagram that comprises the brushless direct current motor system of brushless direct current motor torque current testing circuit of the present invention;
Fig. 3 is the circuit diagram of brushless direct current motor system that comprises the brushless direct current motor torque current testing circuit of the embodiment of the invention.
Embodiment
Below, will present invention is described with reference to accompanying drawing and embodiment.
Fig. 2 is the circuit diagram that comprises the brushless direct current motor system of 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 in twos.Here, motor drive module and brushless direct current motor all belong to prior art, so this paper omits its detailed description.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 parallel diode of a plurality of switching tubes of last brachium pontis of positive pole and the inverter circuit of direct supply U, and the other end is connected to the tie point of input terminal of a plurality of switching tubes of the last brachium pontis of inverter circuit; It is parallelly connected with detecting unit to amplify collecting unit, is used to detect the electric current I 2 through detecting unit, wherein, the electric current I 2 through detecting unit be the motor torque electric current that will detect.
In addition, brushless direct current motor torque current testing circuit provided by the invention also can comprise filter unit, and it is connected the amplification collecting unit and is used to control between the ECU of brushless direct current motor.In this case, amplify collecting unit and amplify the voltage at said detecting unit two ends, filter unit carries out filtering to the voltage that amplifies through the amplification collecting unit, and the voltage of filtering is outputed to ECU (AD of ECU end particularly).Here, because ECU belongs to the technology of well known to a person skilled in the art, therefore the descriptions thereof are omitted.
Shown brushless direct current motor torque current testing circuit according to an embodiment of the invention among Fig. 3.In the present embodiment, detecting unit amplifies collecting unit and adopts AD8210 chip (well-known device) for detecting resistance R 4, and filter unit adopts the RC wave filter.Through detecting the electric current I 2=I1+I3 of resistance R 4; Wherein, I1 is the drive current of direct supply U output, and electric current I a, Ib and the Ic that I3 produces for the motor windings inductance is through the freewheel current of last brachium pontis fly-wheel diode, and wherein the direction of electric current I 1, I2 and I3 is a positive dirction with the direction shown in Fig. 2.Need to prove that when freewheel current, I3 is non-vanishing, when not having freewheel current, I3 is zero.
Below, each phase winding electric current is divided into the motor torque electric current is explained in non-commutation constantly respectively with the commutation moment testing process.
As shown in Figure 2; The transfer sequence of supposing brushless direct current motor is followed successively by AB → AC → BC → BA → CA → CB → AB; Switching tube Kt1, Kt3, Kt5 are set has a switching tube to be in conducting state at any time all the time, makes motor drive module drive brushless direct current motor effectively like this.In embodiments of the present invention, with switching tube Kt1 conducting all the time be the testing process of example explanation torque current.
(1) in the non-commutation testing process of motor torque electric current constantly
When the AB state, switching tube Kt1 conducting all the time, at this moment, brachium pontis switching tube Kt6 can be divided into conducting (PWM_ON) and (PWM_OFF) two kinds of situation of shutoff under the current return.
1, when Kt6 is in PWM_ON
Under the situation of switching tube Kt1 conducting, Kt6 conducting, current return forms closed loop through I1, Kt1, A phase winding, B phase winding, Kt6.At this moment, through the electric current I a=I1 of motor A phase winding, the current Ib of B phase winding=-I1, the electric current I c=0 of C phase winding is I2=I1 (I3=0) through the electric current that detects resistance R 4 promptly.
2, when Kt6 is in PWM_OFF
Under the situation that 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.At this moment, Ia=I2, Ib=-I2, Ic=0 is I2=I3 (I1=0) through the electric current that detects resistance R 4.
Therefore, in non-commutation constantly, the electric current I 2 through detecting resistance R 4 is I1 when the PWM_ON state, when the PWM_OFF state, is I3, has promptly reflected the torque current of motor in real time through the electric current I 2 that detects resistance R 4.
(2) in the commutation testing process of motor torque electric current constantly
Is that example is analyzed with the AB state to the commutation of AC state, switching tube Kt1 conducting all the time, and B phase winding electric current can not reduce to zero moment when commutation, but carries out afterflow through diode D3.At this moment, brachium pontis can be divided into switching tube Kt2 conducting (PWM_ON) and (PWM_OFF) two kinds of situation of shutoff under the current return.
1, when Kt2 is in PWM_ON
Two current returns are arranged when Kt2 is in PWM_ON, and 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, and be I2=I1+I3 through the electric current that detects resistance R 4 this moment.
2, when Kt2 is in PWM_OFF
Two current returns are also arranged when Kt2 is in PWM_OFF, and wherein, process winding C, diode D5, I3, switching tube Kt1, a winding A form current closed-loop, and this loop is a C phase afterflow ring; Another is a continuous current circuit, forms current closed-loop through winding B, diode D3, I3, switching tube Kt1, winding A, and this loop is a V phase afterflow ring.Be I2=I3 (I1=0) through the electric current that detects resistance R 4 this moment.
Therefore in commutation constantly, no matter be PWM_ON or PWM_OFF state, reflected the torque current of motor through the real-time current that detects resistance R 4, and acquisition precision be than higher.
Here point out; Adopt resistance as detecting unit in the present embodiment, therefore compare, do not exist because the self inductance effect of inductance itself can influence the problem of the size of current of electric with torque current testing circuit shown in Figure 1; Therefore; Can in real time the collection value be collected ECU, and the torque current accuracy of detection is high, also can reflects the electric current of motor bus in real time.In addition, owing to utilized AD8210,, more can real time reaction go out the electric current of motor bus so the precision that detects is higher.
Below with reference to accompanying drawing and embodiment the present invention is described in detail, still, should be appreciated that, the present invention is not limited to above disclosed exemplary embodiment.Should give claim to explain the most widely, to contain all modification, equivalent structure and the function of disclosed exemplary embodiment.For example, except detecting resistance R 4, said detecting unit can also be special current acquisition circuit; Amplify collecting unit and can also take the amplification acquisition chip of other known different accuracy; Filter unit can be gathered special-purpose filtering chip.
Claims (7)
1. brushless direct current motor torque current testing circuit that is used for brushless direct current motor system, said brushless direct current motor system comprises direct supply, inverter circuit and brushless direct current motor, it is characterized in that, said torque current testing circuit comprises:
Detecting unit, one of which end are connected to the tie point of parallel diode of a plurality of switching tubes of last brachium pontis of positive pole and the said inverter circuit of said direct supply, and the other end is connected to the tie point of input terminal of a plurality of switching tubes of the last brachium pontis of said inverter circuit;
Amplify collecting unit, it is parallelly connected with said detecting unit, is used to gather the electric current through detecting unit, to obtain the torque current of said brushless direct current motor.
2. brushless direct current motor torque current testing circuit according to claim 1 is characterized in that, said detecting unit is a resistance.
3. brushless direct current motor torque current testing circuit according to claim 1 is characterized in that said detecting unit is the current acquisition circuit.
4. brushless direct current motor torque current testing circuit according to claim 1 is characterized in that said amplification collecting unit is the AD8210 chip.
5. brushless direct current motor torque current testing circuit according to claim 1 is characterized in that, also comprises:
Filter unit, it is connected said amplification collecting unit and is used to control between the electronic control unit of said brushless direct current motor,
Said amplification collecting unit amplifies the voltage at said detecting unit two ends, and said filter unit carries out filtering to the voltage that amplifies through said amplification collecting unit, and the voltage of filtering is outputed to said electronic control unit.
6. brushless direct current motor torque current testing circuit according to claim 5 is characterized in that said filter unit is the RC wave filter.
7. a brushless direct current motor system comprises according to any one the described brushless direct current motor torque current testing circuit among the claim 1-6.
Priority Applications (1)
| 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 |
Applications Claiming Priority (1)
| 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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| Publication Number | Publication Date |
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| CN102426282A true CN102426282A (en) | 2012-04-25 |
| CN102426282B CN102426282B (en) | 2015-01-28 |
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| CN201110238624.3A Expired - Fee Related CN102426282B (en) | 2011-08-18 | 2011-08-18 | Brushless direct current motor system and torque current detection circuit thereof |
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Cited By (4)
| 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 (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0467791A (en) * | 1990-07-05 | 1992-03-03 | Matsushita Electric Ind Co Ltd | Motor driver |
| 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 |
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2011
- 2011-08-18 CN CN201110238624.3A patent/CN102426282B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0467791A (en) * | 1990-07-05 | 1992-03-03 | Matsushita Electric Ind Co Ltd | Motor driver |
| 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 |
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Non-Patent Citations (1)
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|---|
| 逄格民 等: "无刷直流电动机新型电流检测方法", 《微电机》 * |
Cited By (4)
| 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 |
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| CN102426282B (en) | 2015-01-28 |
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