CN85104745A - The power control method of variable frequency speed modulation of asynchronous motor - Google Patents
The power control method of variable frequency speed modulation of asynchronous motor Download PDFInfo
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- CN85104745A CN85104745A CN 85104745 CN85104745A CN85104745A CN 85104745 A CN85104745 A CN 85104745A CN 85104745 CN85104745 CN 85104745 CN 85104745 A CN85104745 A CN 85104745A CN 85104745 A CN85104745 A CN 85104745A
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Abstract
The power control method of variable frequency speed modulation of asynchronous motor is a kind of new control method that is used for the current source inverter of asynchronous motor drive.It is to keep under current source inverter DC side and the condition that the active power of AC side equates, the control dc voltage, and realize variable frequency speed modulation of asynchronous motor.This control method has overcome the defect of the too drastic or unexcited of asynchronous machine that the control method of V/f=constant commonly used occurs, can make asynchronous machine at different frequency, stable operation under the different loads is for variable frequency speed modulation of asynchronous motor uses and the widely-used condition of having created of the asynchronous machine of each generic request closed-loop drive in the economize on electricity of blower fan, pump class.
Description
The invention belongs to a kind of new control method of asynchronous motor AC speed regulating.
Asynchronous machine is simple in structure, and maintenance workload is little, can be used for bad working environment, so be widely used in the Electric Drive of industrial all departments.Load current and exciting curent owing to asynchronous machine is coupled again, so the speed regulating control of asynchronous machine is again the most difficult in the various motors.
The current source inverter that is used for asynchronous motor drive is a kind of simple and reliable, invest less, widely used inverter.With the asynchronous machine of current source inverter frequency control, in blower fan, pump class and the demanding Electric Drive of adjusting speed accuracy, all has purposes widely.
The current source inverter that is used for asynchronous motor drive, commonly used both at home and abroad is the control method of V/f=constant at present.Because current source inverter is straight, hand over the voltage relationship of side non-linear, this control method can not adapt to the load variations in the running, and when load was light, power factor cos ψ reduced, and alternating voltage U
～Increase, cause that motor is too drastic; When too drastic when serious, even cause the short circuit of current source inverter load-side.When load was heavy, power factor cos ψ increased, and makes alternating voltage U
～Reduce, cause the motor unexcited; When unexcited is serious, even cause the motor stall.For overcoming this technical barrier, the country of advanced technology is at the vector control method of the asynchronous motor drive of research applied current source inventer in the world.But this method complexity also has considerable difficulty in industrial practicality.The asynchronous machine of the current source inverter frequency control of present industrial practice remains the control method of using the Vf=constant, but this method can only work under more stable load, and just inapplicable in the bigger occasion of load variations.
The present invention is exactly in order to solve the problems of the technologies described above, overcome the shortcoming of the control method existence of V/f=constant, make the asynchronous machine of current source inverter speed governing frequently can stable operation under arbitrary load, optional frequency, proposed a kind of power control method of new control method-variable frequency speed modulation of asynchronous motor.
Main points of the present invention are: keeping under current source inverter DC side and the condition that the active power of AC side equates, and control dc voltage Ud, and realize variable frequency speed modulation of asynchronous motor.
Expression formula: UdId=
U～I～cosψ
Ud＝
U～cosψI～/Id
By the characteristic of current source inverter determined I～/the Id=constant, this constant depends on the mode of connection.
∴Ud＝KU～cosψ
In the formula: Ud-current source inverter dc voltage
Id-current source inverter DC side electric current
U
～-current source inverter AC side voltage
I
～-current source inverter ac-side current
Cos ψ-asynchronous motor power factor
The K-constant
Therefore, Ud is directly proportional with the product of U～cos ψ.
Implementation step:
1. with load characteristic and condition of work input computer, draw the Ud/f function curve.
2. the continuous detecting that is in operation goes out Ud and the U under the actual loading
～Value, the input computer calculates corresponding cos ψ value.Or directly continuous detecting goes out cos ψ value and imports computer, and this cos ψ value is imported in the Ud control ring, multiply each other as a parameter and Ud/f function, and with it as U
～Set-point, realize the closed-loop adjustment of Ud Ud and actual loading being adapted, it is Ud=KU～cos ψ that realization Ud is directly proportional with U～cos ψ, and the frequency control of speed closed loop.
3. when the needs supersynchronous speed was moved, this moment, frequency surpassed power frequency, and the Ud/f functional relation still can be kept current source inverter both sides active power and equate U
～Be limited in the 380V weak magnetic field operation, load current is no more than the motor rated current.
The embodiment of the invention: finished control 17KW motor and under various loads, moved.Finished a motor bringing onto load, another empty load of motor is by the operation of the multiple asynchronous motors of same current source inverter power supply.
Facts have proved that the present invention has following effect:
1. the present invention makes the asynchronous machine of current source inverter frequency control can stable operation in the situation of load variations, has guaranteed stability and the reliability of operation.
2. the present invention can be used for the AC speed regulating of water pump, fan-type asynchronous machine, with saves energy, can economize on electricity 10～30%. The asynchronous machine that also can be used for each generic request closed-loop drive satisfies the requirement that all kinds of manufacturing machines are used for abominable working environment.
3. the present invention's asynchronous motor speed-regulating system of can be used for the multiple motors transmission and under different loads, moving.
4. the present invention both can be used on the following permanent excitation operation of power frequency, also can be used on the above weak magnetic field operation of power frequency, and maximum speed is subjected to the structural limitations of motor itself.
[note]: the related documents of prior art:
1.V the related documents of f=constant:
" controllable silicon frequency control (continuous volume) "
Scientific literature publishing house Chongqing branch is published
2. the relevant document of vector control:
" the Shi Liang Bian Change control system (upper and lower) of asynchronous motor frequency-changing speed-regulating "
" electric drive " magazine 1984 4,5 phases
Claims (4)
1, a kind of method of variable frequency speed modulation of asynchronous motor, it comprises the method that realizes variable frequency control asynchronous machine rotating speed with current source inverter, it is characterized in that keeping under current source inverter DC side and the condition that the active power of AC side equates, control dc voltage Ud, the power control method of the frequency control that realization asynchronous machine exciting curent under different loads, different frequency is constant.
2, a kind of power control method according to the described variable frequency speed modulation of asynchronous motor of claim 1, it is characterized in that continuous detecting goes out U under the actual loading～and Ud value, calculate corresponding cos ψ value, or directly continuous detecting goes out cos ψ value, this cos ψ value is input in the Ud control ring, multiply each other as a parameter and Ud/f function, product is as U
～Set-point and realize asynchronous machine terminal voltage U
～Closed-loop adjustment, and the frequency control of speed closed loop.
3, a kind of power control method according to the described variable frequency speed modulation of asynchronous motor of claim 1 is characterized in that it includes the manufacture method of working out the Ud/f function curve according to different loads characteristic and condition of work.
4, a kind of power control method of the frequency control according to claim 1,2 described asynchronous machines, it is characterized in that when frequency when power frequency is above, still can make the supersynchronous weak magnetic field operation of asynchronous machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85104745 CN85104745A (en) | 1985-06-21 | 1985-06-21 | The power control method of variable frequency speed modulation of asynchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85104745 CN85104745A (en) | 1985-06-21 | 1985-06-21 | The power control method of variable frequency speed modulation of asynchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN85104745A true CN85104745A (en) | 1986-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85104745 Pending CN85104745A (en) | 1985-06-21 | 1985-06-21 | The power control method of variable frequency speed modulation of asynchronous motor |
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| CN (1) | CN85104745A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111756305A (en) * | 2020-06-21 | 2020-10-09 | 中车永济电机有限公司 | Locomotive auxiliary converter topological structure |
-
1985
- 1985-06-21 CN CN 85104745 patent/CN85104745A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111756305A (en) * | 2020-06-21 | 2020-10-09 | 中车永济电机有限公司 | Locomotive auxiliary converter topological structure |
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