CN103066917A - Wound-rotor asynchronous motor cascade speed control method - Google Patents
Wound-rotor asynchronous motor cascade speed control method Download PDFInfo
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- CN103066917A CN103066917A CN2012105366674A CN201210536667A CN103066917A CN 103066917 A CN103066917 A CN 103066917A CN 2012105366674 A CN2012105366674 A CN 2012105366674A CN 201210536667 A CN201210536667 A CN 201210536667A CN 103066917 A CN103066917 A CN 103066917A
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Abstract
The invention provides a wound-rotor asynchronous motor cascade speed control method, and belongs to the field of motor speed control. Additional electromotive force which is in the same frequency with rotor electromotive force is arranged in a rotor return circuit in serial-in mode, and amplitudes and phases of the additional electromotive force are changed to achieve speed control. When a motor runs at a low speed, a device generating the additional electromotive force is utilized, absorbed slip power is fed back to a power grid or sent back again to a shaft of the motor for output, and therefore the motor has high power when running at the lower speed. By means of the wound-rotor asynchronous motor cascade speed control method, power factors are improved, inverter volume is reduced, the structure is simple and reliable, and the method is an ideal speed control scheme and can be widely used in the field of wound-rotor asynchronous motor speed control.
Description
Technical field
The invention belongs to the electric machine speed regulation control field, relate in particular to a kind of method for controlling speed regulation for wire wound asynchronous motor.
Background technology
The cascade adjustable-speed system of wire wound asynchronous motor is comprised of wire wound asynchronous motor, uncontrollable rectifier, SCR inverter, transformer, filter inductance.Uncontrollable rectifier wherein is comprised of the three-phase bridge diode, and SCR inverter is comprised of the three-phase bridge thyristor.Whole circuit structure as shown in Figure 1.Uncontrollable rectifier is made into direct current to slip electromotive force, the electric current of asynchronous motor rotor.Behind filter inductance L, through SCR inverter dc inversion is become to exchange again, become the anti-electrical network of sending back to of suitable voltage by transformer.Change the inversion angle of SCR inverter, the voltage that can change the inverter two ends namely changes the size of additional electromotive force, realizes the low synchronous tandem control of asynchronous motor.
For under subsynchronous electric motor state, rotor voltage is rectified into first direct voltage, and then introduces an additional direct electromotive force., control the amplitude of this direct electromotive force., just can regulate the rotating speed of asynchronous motor.Certainly this direct current additional electric driving important and influential persons there is certain specification requirement.At first, it should be level and smooth adjustable, to satisfy the requirement to the motor speed smooth adjustment; Secondly, from energy-conservation angle, the device of wishing to produce additional direct electromotive force. can absorb to survey from asynchronous motor rotor and transmit the slip power that comes and be used.Scheme is to adopt the silicon con trolled rectifier device that is operated in active inversion as the power supply that produces additional direct electromotive force. preferably.
The tandem control of wire wound asynchronous motor, under the constant condition of load torque, the electromagnetic power of asynchronous motor is constant, the copper loss of rotor consumption is directly proportional with slip, is called again slip power so copper loss of rotor consumes.During the speed governing of rotor series resistor, rotating speed is transferred lowlyer, and then slip power is larger, and power output is less, and efficient is lower, so the speed governing of rotor series resistor is very uneconomical.
Summary of the invention
Technical problem to be solved by this invention provides a kind of tandem control method of wire wound asynchronous motor, it seals in the additional electromotive force with rotor motor-driven gesture same frequency in rotor loop, realize speed governing by amplitude and the phase place that changes additional electromotive force, make motor when low-speed running, still have higher power.
Technical scheme of the present invention is: the tandem control method that a kind of wire wound asynchronous motor is provided, be included in the additional electromotive force that seals in the rotor loop with rotor motor-driven gesture same frequency, realize speed governing by amplitude and the phase place that changes additional electromotive force, it is characterized in that: in rotor loop, seal in the additional electromotive force with rotor motor-driven gesture same frequency, realize speed governing by amplitude and the phase place that changes additional electromotive force; When the motor low-speed running, utilize to produce the device of additional electromotive force, this part slip power that absorbs is fed back to electrical network or send back on the motor reel again and export, so just make motor when low-speed running, still have higher power.
Concrete, its described tandem control method is rectified into direct voltage with the motor rotor electromotive force first, then introduces a direct current additional electromotive force, regulates the amplitude of direct current additional electromotive force, regulates the rotating speed of asynchronous motor.
Its described tandem control method is DC chopper CH in parallel between motor rotor rectifier and inverter; Described DC chopper CH is operated on off state; When it was connected, the rotor rectifier circuit was by short circuit, motor operation rotor short-circuit state; When it disconnected, motor operation was at the tandem state; On the one hand, the inversion angle with inverter remains on reactive power; On the other hand, come regulating electric machine rotating speed by the duty ratio (namely changing inverter voltage) that changes chopper.
Further, the duty ratio of described change chopper realizes by changing inverter voltage.
Its described tandem control method is controlled direct voltage with chopper, and it is constant that the pilot angle of inverter is set as the minimum value of permission, can reduce idle consumption, and improve the system power factor.
Compared with the prior art, advantage of the present invention is: not only improved power factor, reduced the capacity of inverter, and structure being also simple and reliable, is a kind of comparatively ideal speed-regulating scheme.
Description of drawings
Fig. 1 is that the system of Cascade Speed Regulation for AC Asynchronous Motor consists of schematic diagram;
Fig. 2 is copped wave control string line governing system schematic diagram of the present invention.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing.
Among Fig. 1, the cascade adjustable-speed system of wire wound asynchronous motor is comprised of wire wound asynchronous motor, uncontrollable rectifier, SCR inverter, transformer, filter inductance.Uncontrollable rectifier wherein is comprised of the three-phase bridge diode, and SCR inverter is comprised of the three-phase bridge thyristor.Uncontrollable rectifier is made into direct current to slip electromotive force, the electric current of asynchronous motor rotor.Behind filter inductance L, through SCR inverter dc inversion is become to exchange again, become the anti-electrical network of sending back to of suitable voltage by transformer.Change the inversion angle of SCR inverter, the voltage that can change the inverter two ends namely changes the size of additional electromotive force, realizes the low synchronous tandem control of asynchronous motor.
Among Fig. 2, provided the cascade adjustable-speed system schematic diagram of copped wave control, CH is DC chopper among the figure, and available triode thyristor maybe can turn-off power electronic device and form, and the latter can simplify chopper circuit greatly.
As shown in the figure, DC chopper CH in parallel between motor rotor rectifier and inverter; Described DC chopper CH is operated on off state; When it was connected, the rotor rectifier circuit was by short circuit, motor operation rotor short-circuit state; When it disconnected, motor operation was at the tandem state; On the one hand, the inversion angle with inverter remains on reactive power; On the other hand, come regulating electric machine rotating speed by the duty ratio (namely changing inverter voltage) that changes chopper.
The duty ratio of its described change chopper realizes by changing inverter voltage.
Its described tandem control method is controlled direct voltage with chopper, and it is constant that the pilot angle of inverter is set as the minimum value of permission, can reduce idle consumption, and improve the system power factor.
In order to change the rotor current of wire wound asynchronous motor, except rotor loop crosstalk resistance, can also in rotor loop, seal in the additional electromotive force with rotor motor-driven gesture same frequency, realize speed governing by amplitude and the phase place that changes additional electromotive force.Like this, when low-speed running, slip power only has sub-fraction to consume at the resistance of rotor winding itself, and most of additional electromotive force that is sealed in absorbs, recycling produces the device of additional electromotive force, manage this part slip power that absorbs is fed back to electrical network (or send back on the motor reel and export), so just make motor when low-speed running, still have higher power, this high efficiency speed regulating method that seals in additional electromotive force in the coiling type asynchronous motor rotor loop is called and is tandem control.
Compared with the prior art, technical scheme of the present invention has not only improved power factor, has reduced the capacity of inverter, and structure is also simple and reliable, is a kind of comparatively ideal speed-regulating scheme.
The present invention can be widely used in the speed regulating control field of wire wound asynchronous motor.
Claims (5)
1. the tandem control method of a wire wound asynchronous motor is included in the additional electromotive force that seals in the rotor loop with rotor motor-driven gesture same frequency, realizes speed governing by amplitude and the phase place that changes additional electromotive force, it is characterized in that:
In rotor loop, seal in the additional electromotive force with rotor motor-driven gesture same frequency, realize speed governing by amplitude and the phase place that changes additional electromotive force;
When the motor low-speed running, utilize to produce the device of additional electromotive force, this part slip power that absorbs is fed back to electrical network or send back on the motor reel again and export, so just make motor when low-speed running, still have higher power.
2. according to the tandem control method of wire wound asynchronous motor claimed in claim 1, the described tandem control method of its feature is rectified into direct voltage with the motor rotor electromotive force first, then introduce a direct current additional electromotive force, regulate the amplitude of direct current additional electromotive force, regulate the rotating speed of asynchronous motor.
3. according to the tandem control method of wire wound asynchronous motor claimed in claim 1, it is characterized in that described tandem control method DC chopper CH in parallel between motor rotor rectifier and inverter; Described DC chopper CH is operated on off state; When it was connected, the rotor rectifier circuit was by short circuit, motor operation rotor short-circuit state; When it disconnected, motor operation was at the tandem state; On the one hand, the inversion angle with inverter remains on reactive power; On the other hand, come regulating electric machine rotating speed by the duty ratio (namely changing inverter voltage) that changes chopper.
4. according to the tandem control method of wire wound asynchronous motor claimed in claim 3, it is characterized in that the duty ratio of described change chopper realizes by changing inverter voltage.
5. according to the tandem control method of wire wound asynchronous motor claimed in claim 3, it is characterized in that described tandem control method controls direct voltage with chopper, and it is constant that the pilot angle of inverter is set as the minimum value of permission, can reduce idle consumption, and improve the system power factor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210536667.4A CN103066917B (en) | 2012-12-12 | 2012-12-12 | A kind of tandem control method of wire wound asynchronous motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210536667.4A CN103066917B (en) | 2012-12-12 | 2012-12-12 | A kind of tandem control method of wire wound asynchronous motor |
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| Publication Number | Publication Date |
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| CN103066917A true CN103066917A (en) | 2013-04-24 |
| CN103066917B CN103066917B (en) | 2016-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210536667.4A Active CN103066917B (en) | 2012-12-12 | 2012-12-12 | A kind of tandem control method of wire wound asynchronous motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103780194A (en) * | 2014-01-06 | 2014-05-07 | 中国矿业大学 | Double fed motor speed regulating control method |
Citations (5)
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|---|---|---|---|---|
| US20050251310A1 (en) * | 2002-07-05 | 2005-11-10 | Jurgen Bohm | Method for steering a vehicle with superimposed steering |
| CN2775934Y (en) * | 2005-01-15 | 2006-04-26 | 刘晓兰 | Full control high frequency chopping and full control active inverter type motor speed changing controller |
| CN201146481Y (en) * | 2008-01-18 | 2008-11-05 | 上海普电节能科技有限公司 | Medium-voltage motor slip-control digital intelligence speed-regulating device without speed sensor |
| CN201174681Y (en) * | 2008-02-02 | 2008-12-31 | 上海普电节能科技有限公司 | Slip ratio controlling digital intelligent speed regulating device for motor with electric grid fast switching function |
| CN202103627U (en) * | 2011-06-18 | 2012-01-04 | 天津博通达能源科技股份有限公司 | Full control chopper full control active inversion motor speed regulation controlling means |
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2012
- 2012-12-12 CN CN201210536667.4A patent/CN103066917B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050251310A1 (en) * | 2002-07-05 | 2005-11-10 | Jurgen Bohm | Method for steering a vehicle with superimposed steering |
| CN2775934Y (en) * | 2005-01-15 | 2006-04-26 | 刘晓兰 | Full control high frequency chopping and full control active inverter type motor speed changing controller |
| CN201146481Y (en) * | 2008-01-18 | 2008-11-05 | 上海普电节能科技有限公司 | Medium-voltage motor slip-control digital intelligence speed-regulating device without speed sensor |
| CN201174681Y (en) * | 2008-02-02 | 2008-12-31 | 上海普电节能科技有限公司 | Slip ratio controlling digital intelligent speed regulating device for motor with electric grid fast switching function |
| CN202103627U (en) * | 2011-06-18 | 2012-01-04 | 天津博通达能源科技股份有限公司 | Full control chopper full control active inversion motor speed regulation controlling means |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103780194A (en) * | 2014-01-06 | 2014-05-07 | 中国矿业大学 | Double fed motor speed regulating control method |
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| CN103066917B (en) | 2016-01-20 |
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