CN105471327A - Motor low-frequency driving control algorithm - Google Patents
Motor low-frequency driving control algorithm Download PDFInfo
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- CN105471327A CN105471327A CN201510585415.4A CN201510585415A CN105471327A CN 105471327 A CN105471327 A CN 105471327A CN 201510585415 A CN201510585415 A CN 201510585415A CN 105471327 A CN105471327 A CN 105471327A
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Abstract
The invention provides motor low-frequency driving control algorithm. Firstly, a silicon controlled rectifier driving control motor device is constructed, that is to say, a first silicon controlled rectifier group, a second silicon controlled rectifier group and a third silicon controlled rectifier group are respectively constructed by a first silicon controlled rectifier VT1 and a second silicon controlled rectifier VT4 in anti-parallel connection, a third silicon controlled rectifier VT3 and a fourth silicon controlled rectifier VT6 in anti-parallel connection, and a fifth silicon controlled rectifier VT5 and a sixth silicon controlled rectifier VT2 in anti-parallel connection. An A phase wire is connected with an A phase terminal of a motor through the first silicon controlled rectifier group, a B phase wire is connected with a B phase terminal of the motor through the second silicon controlled rectifier group, a C phase wire is connected with a C phase terminal of the motor through the third silicon controlled rectifier group, in addition, Ua, Ub and Uc respectively stand for an A phase voltage, a B phase voltage and a C phase voltage. By adopting such a structure, the defects in the prior art that the currents are respectively discontinuous and the motor generates heat severely under a low frequency are overcome.
Description
Technical field
The invention belongs to the converter technique field of water supply, draining, irrigation and sewage disposal, be specifically related to a kind of motor low frequency driving control algolithm.
Background technology
Soft starter adopts by silicon controlled voltage regulating mode usually, electric moter voltage raises gradually, thus motor speed raises gradually, reach soft start motor object, reduce motor starting currents, but often adopt voltage regulating mode, motor torque diminishes, the deliquescing of motor curve characteristic, starting current, at 3 ~ 4 times, also has certain impact to electrical network.When not changing hardware SCR structure, employing variable frequency control algorithm as usual, motor torque becomes large, starting current, at 2 times, reduces and impacts, if motor is the words of heavy-load start electrical network, Regulation Control is improper, can not heavy-load start, and variable frequency control better can play motor performance, drives heavily loaded motor.
Summary of the invention
Object of the present invention provides a kind of motor low frequency driving control algolithm, first controllable silicon drived control electric machine is built, namely by the first controllable silicon VT1 and the second controllable silicon VT4 of reverse parallel connection, 3rd controllable silicon VT3 of reverse parallel connection and the 4th controllable silicon VT6, 5th controllable silicon VT5 and the 6th controllable silicon VT2 of reverse parallel connection form the first Group of Silicon Controlled Rectifier respectively, second Group of Silicon Controlled Rectifier, 3rd Group of Silicon Controlled Rectifier, A phase line is connected by the A phase terminal of the first Group of Silicon Controlled Rectifier with motor, B phase line is connected by the B phase terminal of the second Group of Silicon Controlled Rectifier with motor, C phase line is connected by the C phase terminal of the 3rd Group of Silicon Controlled Rectifier with motor, use Ua in addition, Ub, Uc is respectively A phase voltage, B phase voltage, C phase voltage.The electric current that such structure avoids prior art is all discontinuous, the motor feels hot when low frequency more serious defect also.
In order to overcome deficiency of the prior art, the invention provides a kind of solution of motor low frequency driving control algolithm, specific as follows:
A kind of motor low frequency driving control algolithm, step is as follows:
Step 1: first build controllable silicon drived control electric machine, namely by the first controllable silicon VT1 and the second controllable silicon VT4 of reverse parallel connection, 3rd controllable silicon VT3 of reverse parallel connection and the 4th controllable silicon VT6, 5th controllable silicon VT5 and the 6th controllable silicon VT2 of reverse parallel connection form the first Group of Silicon Controlled Rectifier respectively, second Group of Silicon Controlled Rectifier, 3rd Group of Silicon Controlled Rectifier, A phase line is connected by the A phase terminal of the first Group of Silicon Controlled Rectifier with motor, B phase line is connected by the B phase terminal of the second Group of Silicon Controlled Rectifier with motor, C phase line is connected by the C phase terminal of the 3rd Group of Silicon Controlled Rectifier with motor, use Ua in addition, Ub, Uc is respectively A phase voltage, B phase voltage, C phase voltage,
Step 2: according to motor equivalent mathematical model, obtains the equation as shown in formula (1):
Wherein: Te: torque, Pe: power of motor, Ω
1: power supply angular speed, R
1: motor stator impedance X
1 σ: motor stator leakage reactance,
rotor equiva lent impedance,
rotor equivalent inductive reactance, S: revolutional slip, U
1for stator winding terminal voltage, calculated by formula (1): torque and voltage, revolutional slip relation, carry out soft starter variable frequency control according to this relation, specific as follows:
When needs export setpoint frequency, by gathering outside voltage phase signal, current signal, power-factor angle, enters the motor equivalent mathematical model described in inside, passes through Fuzzy Calculation, draw should trigger which silicon (VT1 ~ VT6), according to equation U at this phase point
1≈ E
1=4.44 × f
1× N
1× φ
1× K
w1, wherein f1 is supply frequency, and N1 is that stator winding is often in series the number of turn, K
w1for fundamental wave winding coefficient, Φ 1 is motor every pole magnetic flux, by means of frequency decrease, E1 also will decline, i.e. E1/f1=constant, otherwise motor can cross magnetic, cause vibrations and heating, need great starting voltage by this formulae discovery motor in this phase place, thus change into silicon controlled Trigger Angle, Eg: setpoint frequency triggers, and E1, also because reducing by half, meets E1/f1=constant, actual measurement voltage, power-factor angle, the area triggering equivalent waveform also should reduce by half, and meets E1 also because reducing by half.
Described setpoint frequency numerical value is 50/n....50/3,50/2,50.
Described electrode low frequency driving algorithm adopts classification frequency conversion, and electric current, voltage are discontinuous.
Present invention incorporates the advantage of frequency converter and soft starter, the variable frequency control of the low and frequency converter of the cost as soft starter, does not need the accurate application industry of frequency conversion or occasion at some, needs again motor low-frequency operation, as fire protection sector.Reach same object, but cost greatly reduces.Cost declines more than 50%
Accompanying drawing explanation
Fig. 1 is silicon controlled connection diagram of the present invention.
Fig. 2 is the equivalent circuit diagram of motor of the present invention.
Fig. 3 is design sketch of the present invention.
Embodiment
Soft starter variable frequency control, interchange can only be carried out n frequency division, frequency is discontinuous, and as 50/n....50/3,50/2,50. methods are merged n cycle alternating-current, and its positive half cycle only allows the conducting of forward half-wave, negative half period only allow reverse half-wave conducting.Such soft starter variable frequency control, interchange can only be carried out n frequency division, frequency is discontinuous, as 50/n....50/3,50/2,50, voltage, electric current is also all discontinuous, and when low frequency, it is more serious that the motor feels hot.
Below in conjunction with accompanying drawing, summary of the invention is described further:
With reference to shown in Fig. 1, Fig. 2 and Fig. 3, motor low frequency driving control algolithm, step is as follows:
Step 1: first build controllable silicon drived control electric machine, namely by the first controllable silicon VT1 and the second controllable silicon VT4 of reverse parallel connection, 3rd controllable silicon VT3 of reverse parallel connection and the 4th controllable silicon VT6, 5th controllable silicon VT5 and the 6th controllable silicon VT2 of reverse parallel connection form the first Group of Silicon Controlled Rectifier respectively, second Group of Silicon Controlled Rectifier, 3rd Group of Silicon Controlled Rectifier, A phase line is connected by the A phase terminal of the first Group of Silicon Controlled Rectifier with motor, B phase line is connected by the B phase terminal of the second Group of Silicon Controlled Rectifier with motor, C phase line is connected by the C phase terminal of the 3rd Group of Silicon Controlled Rectifier with motor, use Ua in addition, Ub, Uc is respectively A phase voltage, B phase voltage, C phase voltage,
Step 2: according to motor equivalent mathematical model, obtains the equation as shown in formula (1):
Wherein: Te: torque, Pe: power of motor, Ω
1: power supply angular speed, R
1: motor stator impedance X
1 σ: motor stator leakage reactance,
rotor equiva lent impedance,
rotor equivalent inductive reactance, S: revolutional slip, U
1for stator winding terminal voltage, calculated by formula (1): torque and voltage, revolutional slip relation, carry out soft starter variable frequency control according to this relation, specific as follows:
When needs export setpoint frequency, by gathering outside voltage phase signal, current signal, power-factor angle, enters the motor equivalent mathematical model described in inside, passes through Fuzzy Calculation, draw should trigger which silicon (VT1 ~ VT6), according to equation U at this phase point
1≈ E
1=4.44 × f
1× N
1× φ
1× K
w1, wherein f1 is supply frequency, and N1 is that stator winding is often in series the number of turn, K
w1for fundamental wave winding coefficient, Φ 1 is motor every pole magnetic flux, by means of frequency decrease, E1 also will decline, i.e. E1/f1=constant, otherwise motor can cross magnetic, cause vibrations and heating, need great starting voltage by this formulae discovery motor in this phase place, thus change into silicon controlled Trigger Angle, Eg: setpoint frequency triggers, and E1, also because reducing by half, meets E1/f1=constant, actual measurement voltage, power-factor angle, the area triggering equivalent waveform also should reduce by half, and meets E1 also because reducing by half.Described setpoint frequency numerical value is 50/n....50/3,50/2,50.
Described electrode low frequency driving algorithm adopts classification frequency conversion, and electric current, voltage are discontinuous.
The present invention adopts by silicon controlled voltage regulating mode according to soft starter usually, electric moter voltage raises gradually, thus motor speed raises gradually, reach soft start motor object, reduce motor starting currents, but often adopt voltage regulating mode, motor torque diminishes, the deliquescing of motor curve characteristic, starting current, at 3 ~ 4 times, also has certain impact to electrical network.And when not changing hardware SCR structure, employing variable frequency control algorithm as usual, motor torque becomes large, starting current, at 2 times, reduces and impacts, if motor is the words of heavy-load start electrical network, Regulation Control is improper, can not heavy-load start, and variable frequency control better can play motor performance, drives heavily loaded motor.
Particularly, the present invention can reach variable frequency control object, and n frequency division is carried out in interchange, and frequency is discontinuous, and as 50/n....50/3,50/2,50. methods are merged n cycle alternating-current, and its positive half cycle only allows the conducting of forward half-wave, negative half period only allow reverse half-wave conducting.As shown in Figure 3: solid line is outside actual voltage signal, dotted line is for controlling motor frequency conversion effect envelope.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be do not depart from technical solution of the present invention content, according to technical spirit of the present invention, within the spirit and principles in the present invention, to any simple amendment that above embodiment is done, equivalent replacement and improvement etc., within the protection range all still belonging to technical solution of the present invention.
Claims (3)
1. a motor low frequency driving control algolithm, is characterized in that, step is as follows:
Step 1: first build controllable silicon drived control electric machine, namely by the first controllable silicon VT1 and the second controllable silicon VT4 of reverse parallel connection, 3rd controllable silicon VT3 of reverse parallel connection and the 4th controllable silicon VT6, 5th controllable silicon VT5 and the 6th controllable silicon VT2 of reverse parallel connection form the first Group of Silicon Controlled Rectifier respectively, second Group of Silicon Controlled Rectifier, 3rd Group of Silicon Controlled Rectifier, A phase line is connected by the A phase terminal of the first Group of Silicon Controlled Rectifier with motor, B phase line is connected by the B phase terminal of the second Group of Silicon Controlled Rectifier with motor, C phase line is connected by the C phase terminal of the 3rd Group of Silicon Controlled Rectifier with motor, use Ua in addition, Ub, Uc is respectively A phase voltage, B phase voltage, C phase voltage,
Step 2: according to motor equivalent mathematical model, obtains the equation as shown in formula (1):
Wherein: Te: torque, Pe: power of motor, Ω
1: power supply angular speed, R
1: motor stator impedance X
1 σ: motor stator leakage reactance,
rotor equiva lent impedance,
rotor equivalent inductive reactance, S: revolutional slip, U
1for stator winding terminal voltage, calculated by formula (1): torque and voltage, revolutional slip relation, carry out soft starter variable frequency control according to this relation, specific as follows:
When needs export setpoint frequency, by gathering outside voltage phase signal, current signal, power-factor angle, enters the motor equivalent mathematical model described in inside, passes through Fuzzy Calculation, draw should trigger which silicon (VT1 ~ VT6), according to equation U at this phase point
1≈ E
1=4.44 × f
1× N
1× φ
1× K
w1, wherein f1 is supply frequency, and N1 is that stator winding is often in series the number of turn, K
w1for fundamental wave winding coefficient, Φ 1 is motor every pole magnetic flux, by means of frequency decrease, E1 also will decline, i.e. E1/f1=constant, otherwise motor can cross magnetic, cause vibrations and heating, need great starting voltage by this formulae discovery motor in this phase place, thus change into silicon controlled Trigger Angle, Eg: setpoint frequency triggers, and E1, also because reducing by half, meets E1/f1=constant, actual measurement voltage, power-factor angle, the area triggering equivalent waveform also should reduce by half, and meets E1 also because reducing by half.
2. motor low frequency driving control algolithm according to claim 1, is characterized in that described setpoint frequency numerical value is 50/n....50/3,50/2,50.
3. motor low frequency driving control algolithm according to claim 2, it is characterized in that described electrode low frequency driving algorithm adopts classification frequency conversion, and electric current, voltage is discontinuous.
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| CN201510585415.4A CN105471327A (en) | 2015-09-15 | 2015-09-15 | Motor low-frequency driving control algorithm |
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| CN201510585415.4A CN105471327A (en) | 2015-09-15 | 2015-09-15 | Motor low-frequency driving control algorithm |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106230333A (en) * | 2016-08-17 | 2016-12-14 | 珠海格力节能环保制冷技术研究中心有限公司 | Direct current generator fan-out capability control method and system |
| CN106908724A (en) * | 2017-03-02 | 2017-06-30 | 国家电网公司 | A kind of large-scale phase modifier scene no-load characteristic measurement method |
| CN110417306A (en) * | 2018-04-28 | 2019-11-05 | 钱罗奋 | Double one keys of characteristic of the strong tractive force motor series excitation synchronously control of electric vehicle drive method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101075796A (en) * | 2007-04-19 | 2007-11-21 | 蒋贞荣 | Flexible starter for electric motor |
-
2015
- 2015-09-15 CN CN201510585415.4A patent/CN105471327A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101075796A (en) * | 2007-04-19 | 2007-11-21 | 蒋贞荣 | Flexible starter for electric motor |
Non-Patent Citations (2)
| Title |
|---|
| 王正昊: "晶闸管分级变频软起动研究", 《中国优秀硕士学位论文全文数据库（信息科技辑）》 * |
| 马莉丽: "桥门式起重机电机拖动系统能效及其控制研究", 《中国博士学位论文全文数据库（工程科技Ⅱ辑）》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106230333A (en) * | 2016-08-17 | 2016-12-14 | 珠海格力节能环保制冷技术研究中心有限公司 | Direct current generator fan-out capability control method and system |
| CN106230333B (en) * | 2016-08-17 | 2018-10-02 | 珠海格力电器股份有限公司 | Method and system for controlling output capacity of direct current motor |
| CN106908724A (en) * | 2017-03-02 | 2017-06-30 | 国家电网公司 | A kind of large-scale phase modifier scene no-load characteristic measurement method |
| CN110417306A (en) * | 2018-04-28 | 2019-11-05 | 钱罗奋 | Double one keys of characteristic of the strong tractive force motor series excitation synchronously control of electric vehicle drive method |
| CN110417306B (en) * | 2018-04-28 | 2021-03-30 | 钱罗奋 | Series-excitation synchronous control dual-characteristic one-key driving method for electric vehicle high-traction motor |
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Application publication date: 20160406 |
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