CN100426657C - Fully digital dual-feedback speed-adjusting device of high-voltage motor - Google Patents
Fully digital dual-feedback speed-adjusting device of high-voltage motor Download PDFInfo
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- CN100426657C CN100426657C CNB200610136917XA CN200610136917A CN100426657C CN 100426657 C CN100426657 C CN 100426657C CN B200610136917X A CNB200610136917X A CN B200610136917XA CN 200610136917 A CN200610136917 A CN 200610136917A CN 100426657 C CN100426657 C CN 100426657C
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Abstract
The high-voltage motor full-digital dual-feed speed regulator comprises: a four-CPU control box with input end connected following sensors and potentiometer and output end connected with the trigger input end of following rectifier, three sets of thyristor inverse-parallel full-control bridge rectifier, a rectification transformer with three output windings, three sets of rotor current sensors, one set of dipper current sensor, one set of stator voltage sensor, and a frequency-fixed potentiometer. This invention simplifies control line greatly, and ensures the high-voltage motor running stably on condition of high-efficiency and energy-saving.
Description
Technical field
The present invention relates to a kind of motor speed control device, especially relate to a kind of high-tension winding formula motor dual-feedback speed-adjusting device.
Background technology
The existing main speed-regulating scheme of the motor of high-tension winding formula at present, is a cascade speed regulator.The problem of tandem control maximum be motor when speed governing operation, power factor extreme difference, the essential reactive power compensator that increases in addition during actual motion.Doubly-fed adjustable speed not only can fundamentally solve the problem of the power factor difference of high-voltage motor when speed governing operation, can also realize that alternating current machine carries out speed governing operation more than synchronous speed.It is a kind of speed-regulating scheme that has more prospect.Doubly-fed adjustable speed not only can be applied in blower fan, water pump, also can extensively adopt in frontiers such as wind power generation.Though doubly-fed adjustable speed system advanced technology, the control circuit complexity.Simultaneously, general doubly-fed adjustable speed system requirements rotor winding has 4 or 6 output on lines, and common coiling electric motor has only 3 on lines, 3 cover slip rings.So, on common electric machine, adopt doubly-fed adjustable speed also to need necessary improvement is carried out in its rotor winding outlet, this will greatly influence applying of doubly-fed adjustable speed.
Summary of the invention
The present invention is intended to overcome existing high-tension winding formula motor cascade speed-regulating when operation, the power factor extreme difference, the essential defective that increases reactive power compensator in addition during actual motion, provide a kind of control circuit simple, the power factor height can directly apply to the fully digital dual-feedback speed-adjusting device of high-voltage motor of common coiling electric motor.
Technical scheme of the present invention is: it comprises four CPU system controlled by computer casees, 3 cover thyristor inverse parallel fully controlled bridge rectifiers, rectifier transformer with 3 cover output windings, 3 cover rotor current transducers, 1 cover stator current transducer, 1 cover stator voltage transducer, 1 frequency setting potentiometer, described current sensor, voltage sensor all is connected with four CPU system controlled by computer case inputs with potentiometer, the output of described system controlled by computer case is connected to the triggering input of 3 cover thyristor inverse parallel fully controlled bridge rectifiers, the power input of every cover rectifier links to each other with the output winding of a cover rectifier transformer, and the output of 3 cover rectifiers connects the output of formation three-phase according to Y connection and connects with high-voltage motor rotor winding through contactor.
Beneficial effect of the present invention: finish whole controlled function of double-fed adjusting device with four CUP system controlled by computer casees, greatly simplify the control circuit of double-fed adjusting device, realized the software implementation of hardware controls function; The rectifier transformer of the independent output of 3 covers windings and the mode of connection that connects respectively of 3 groups of thyristor inverse parallel fully controlled bridges have guaranteed that dual-feedback speed-adjusting device can directly power to the rotor of the common high-tension winding formula motor that has only 3 on lines.By the closed-loop control of power factor, can make high-voltage motor speed governing operation stably under the most energy-efficient condition.
Description of drawings
Fig. 1 is the functional-block diagram of one embodiment of the invention;
Fig. 2 is a system controlled by computer case functional-block diagram embodiment illustrated in fig. 1.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
With reference to accompanying drawing, present embodiment comprises four CPU system controlled by computer case A, 3 cover thyristor inverse parallel fully controlled bridge rectifier A1-A3, rectifier transformer T with 3 cover output windings, 3 cover rotor current transducer TA2-TA4,1 cover stator current transducer TA1,1 cover stator voltage transducer TV, 1 frequency setting potentiometer RP: described current sensor, voltage sensor all is connected with four CPU system controlled by computer case inputs with potentiometer, the output of microcomputer case is connected to the triggering input of 3 cover thyristor inverse parallel fully controlled bridge rectifiers, the power input of every cover rectifier links to each other with the output winding of a cover rectifier transformer, and the output of 3 cover rectifiers connects the output of formation three-phase according to Y connection and connects with high-voltage motor M rotor winding through contactor KM3.
3 dual port RAM chips are contained in four CPU system controlled by computer case inside, and each dual port RAM chip joins with the host CPU bus with from the CPU internal bus respectively.
The stator voltage transducer links to each other with four CPU system controlled by computer casees with the stator current transducer.
The basic principle of doubly-fed adjustable speed is to utilize a cover three-phase alternating current low-frequency power to inject the rotor winding, the static relatively operation logic of rotating magnetic field according to the generation of induction electromotor rotor winding current, in the time of can drawing the doubly-fed adjustable speed operation, the relational expression of the rotating speed of motor and rotor current frequency and phase sequence is:
ω1＝ω1±ω2 (1)
S＝(ω1-ωr)/ω1＝±ω2/ω1 (2)
In the formula: ω 1 is the electric angle speed of stator rotating magnetic field, and ω 2 is the electric angle speed of rotor rotating magnetic field.
When ω 1 identical with ω 2 direction of rotation, get "+" in formula (1) and the formula (2), motor is lower than the synchronous speed operation, when ω 1 is opposite with ω 2 direction of rotation, getting "-" in formula (1) and the formula (2) is that motor is higher than the synchronous speed operation, when ω 2=0, low-frequency power feed-in DC excitation electric current, motor moves with synchronous speed.
The low-frequency power of doubly-fed adjustable speed system requires to have the ability of energy two-way flow, output frequency is generally below 1/3rd of power frequency, and friendship-friendship low-frequency power of forming with 3 groups of thyristor inverse parallel fully controlled bridges is to realize the both economical reliable technique scheme of this low-frequency power.In the present invention as shown in Figure 1, A1～A3 three cover thyristor inverse parallel full-bridges connect respectively with three cover auxiliary winding of rectifier transformer, and the output of A1～A3 is connected into wye connection, has just constituted the major loop of friendship-friendship low frequency power supply system.For so huge thyristor group (totally 36 thyristors), if finish the triggering control task with general control circuit, circuit will be very complicated huge, and reliability will reduce greatly, only use a system controlled by computer case just to finish this task among the present invention.
If no matter the system controlled by computer case in the dual-feedback speed-adjusting device is all to be difficult to competent so many control tasks on the hardware or on software, must to have a plurality of CPU to work in coordination with and just can finish with the scheme of a singlechip CPU only.Microcomputer case of the present utility model has used 4 16-bit single-chip processor CPU to constitute Control System of Microcomputer.See accompanying drawing 2.This one of them carry out system's computing and control for host CPU, three subordinate CPU are responsible for the triggering control of the thyristor inverse parallel full-bridge of phase low frequency output separately.Between the master and slave CPU by dual port RAM as data exchange interface, realized the high-speed channel of control information.Guaranteed the requirement of the real-time of system's control.Specific practice is that each subordinate CPU constitutes an independently Single Chip Microcomputer (SCM) system by its internal bus, finish controlled function separately, in this internal bus, hang up a dual port RAM chip, an other side of dual port RAM directly inserts the bus system of host CPU, such 3 dual port RAM chips become the direct memory cell of host CPU again, make and need not communications protocol between the master and slave CPU by complexity, just can be pellucidly direct reading of data mutually, realized the expansion of master and slave structural high-speed data exchange and hardware corridor.Thereby control the every control strategy that triggers 36 thyristors and finish the doubly-fed adjustable speed system simultaneously hardware guarantee is provided for having realized a system controlled by computer case.
The technical problem of another solution of doubly-fed adjustable speed system is a system control strategy, in the present invention, the control strategy of dual-feedback speed-adjusting device is the power factor closed-loop control, this be by among Fig. 1 to the detection of motor stator U phase current and stator V, W line voltage, the calculating of host CPU in microsystem, power factor when obtaining the motor actual motion, and compare with the power factor of microcomputer inner setting, through the rotor current amplitude of software PID s operation control friendship-friendship low-frequency power output, reach the purpose that makes motor keep the firm power factor to move.
Another control strategy of the present invention is the output frequency of friendship-friendship low-frequency power, controls principle by him and carries out, and directly controls rotor frequency by RP potentiometer among Fig. 1, promptly rotating speed of motor is implemented open loop control.Can not be used in installation rate transducer on the motor like this, simplified system disposes the application that is beneficial to doubly-fed adjustable speed.
Among the present invention, liquid activated rheostat R and starting contactor KM1 are used for the startup of motor, and rotor short circuit contactor KM2 is used for motor and moves in rated speed.The KM3 contactor is used to hand over-hand over the input of low-frequency power, makes motor enter the doubly-fed adjustable speed operation.
Claims (2)
1, a kind of fully digital dual-feedback speed-adjusting device of high-voltage motor, it is characterized in that, it comprises four CPU system controlled by computer casees, 3 cover thyristor inverse parallel fully controlled bridge rectifiers, rectifier transformer with 3 cover output windings, 3 cover rotor current transducers, 1 cover stator current transducer, 1 cover stator voltage transducer, 1 frequency setting potentiometer, described current sensor, voltage sensor all is connected with four CPU system controlled by computer case inputs with potentiometer, the output of described system controlled by computer case is connected to the triggering input of 3 cover thyristor inverse parallel fully controlled bridge rectifiers, the power input of every cover rectifier links to each other with the output winding of a cover rectifier transformer, and the output of 3 cover rectifiers connects the output of formation three-phase according to Y connection and connects with high-voltage motor rotor winding through contactor.
2, fully digital dual-feedback speed-adjusting device of high-voltage motor according to claim 1 is characterized in that: 3 dual port RAM chips are contained in described four CPU system controlled by computer case inside, and each dual port RAM chip joins with the host CPU bus with from the CPU internal bus respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB200610136917XA CN100426657C (en) | 2006-12-22 | 2006-12-22 | Fully digital dual-feedback speed-adjusting device of high-voltage motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB200610136917XA CN100426657C (en) | 2006-12-22 | 2006-12-22 | Fully digital dual-feedback speed-adjusting device of high-voltage motor |
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| CN101018039A CN101018039A (en) | 2007-08-15 |
| CN100426657C true CN100426657C (en) | 2008-10-15 |
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| CNB200610136917XA Expired - Fee Related CN100426657C (en) | 2006-12-22 | 2006-12-22 | Fully digital dual-feedback speed-adjusting device of high-voltage motor |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255600A (en) * | 2010-05-18 | 2011-11-23 | 赵金荣 | Rotor voltage and speed regulation device |
| CN102340270B (en) * | 2011-08-16 | 2013-12-25 | 沈阳工业大学 | Programmable logic controller (PLC)-and-frequency-converter-based energy saving control system and method for doubly-fed motor |
| CN108306572B (en) * | 2018-01-29 | 2020-03-24 | 西门子工厂自动化工程有限公司 | Method, device, system, processor and terminal for controlling brushless doubly-fed motor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1014665B (en) * | 1986-01-11 | 1991-11-06 | 冶金部北京钢铁设计研究总院 | Alternately changeable-frequency speed-regulation system |
| CN2588657Y (en) * | 2002-08-31 | 2003-11-26 | 李志军 | Intelligent static phase advancer |
| CN1828573A (en) * | 2005-03-01 | 2006-09-06 | 华为技术有限公司 | Multiple-CPU system and its control method |
-
2006
- 2006-12-22 CN CNB200610136917XA patent/CN100426657C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1014665B (en) * | 1986-01-11 | 1991-11-06 | 冶金部北京钢铁设计研究总院 | Alternately changeable-frequency speed-regulation system |
| CN2588657Y (en) * | 2002-08-31 | 2003-11-26 | 李志军 | Intelligent static phase advancer |
| CN1828573A (en) * | 2005-03-01 | 2006-09-06 | 华为技术有限公司 | Multiple-CPU system and its control method |
Non-Patent Citations (4)
| Title |
|---|
| 双口RAM在嵌入式多CPU***中的应用. 唐永辉，徐鸣谦，乌建中.计算机应用与IT技术，第26卷第1期. 2005 |
| 双口RAM在嵌入式多CPU***中的应用. 唐永辉，徐鸣谦，乌建中.计算机应用与IT技术，第26卷第1期. 2005 * |
| 绕线转子异步电动机转子频率鉴频调速. 李少军.济南大学学报，第5卷第2期. 1995 |
| 绕线转子异步电动机转子频率鉴频调速. 李少军.济南大学学报，第5卷第2期. 1995 * |
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