CN209692662U - The control system of wound rotor asynchronous motor power-factor improvement - Google Patents
The control system of wound rotor asynchronous motor power-factor improvement Download PDFInfo
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- CN209692662U CN209692662U CN201920313593.5U CN201920313593U CN209692662U CN 209692662 U CN209692662 U CN 209692662U CN 201920313593 U CN201920313593 U CN 201920313593U CN 209692662 U CN209692662 U CN 209692662U
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Abstract
The utility model relates to a kind of control systems of wound rotor asynchronous motor power-factor improvement, including KM1 contactor, KM2 contactor, RSTStart-up resistor, step-up transformer, tunable capacitor, rotor speed measuring circuit, cpu controller, driver and actuator；Wherein, rotor speed measuring circuit is connected with wound rotor asynchronous motor and cpu controller respectively, and driver is connected with cpu controller and actuator respectively, and actuator is connected with a phase, b phase, c phase step-up transformer secondary side tunable capacitor；A phase, b phase, c phase step-up transformer primary side are connected with KM2 contactor, and KM1 contactor is connected with a, b, c three-phase start-up resistor.The utility model not only increases rotor-side power factor, reduces rotor current, and it improves stator side power factor, reduce stator current, rotor windings loss and stator winding loss are reduced simultaneously, improve the efficiency and overload capacity of asynchronous motor.
Description
Technical field
The utility model belongs to the industrial application of Electrified Transmission, and in particular to a kind of wound rotor asynchronous motor power
The control system that factor improves.
Background technique
In industrial and mining enterprises, the consumption of power system reactive power is mainly three-phase AC asynchronous motor, therefore high-power
Asynchronous motor reactive compensation is the energy-efficient main path of industrial and mining enterprises.Currently, the mode of reactive power compensation is main both at home and abroad
There are two types of: one is motor stator side shunt capacitors；Another kind is that asynchronous motor rotor circuit is concatenated into phase device.
The method of asynchronous motor stator side the parallel power condenser, improves only the power factor of power grid, reduces line
Road electric current, and there is no any improvement to motor working condition itself, motor stator electric current is not reduced, and reactive loss is still
Larger, motor power factor is still lower.And compensation capacity be it is fixed, cannot be adjusted at any time according to actual loading, therefore,
Even power factor can not compensate optimum state on route.
The method of asynchronous motor rotor circuit string rotation phase modifier, can be reduced stator current, but, event high to environmental requirement
Barrier rate is high, service life is short, maintenance cost is high.And phase modifier manufacture difficulty is rotated, specification is few, is difficult to realize most with motor
Good matching.In addition, will lead to electric motor protecting movement stop jumping when rotation phase modifier breaks down, or even burn out motor, influencing to give birth to
It produces.
There is the asynchronous motor rotor based on Control Technique of Microcomputer and power electronic technique in later period the 1990s
Circuit string Static Phase Generator, it is generally connected to asynchronous motor rotor side, and Static Phase Generator improves asynchronous motor itself
Working condition, stator current sharp fall, stator winding loss are also reduced therewith, and stator side power factor significantly improves, fixed
Sub- temperature rise significantly reduces, to extend motor service life, improves the efficiency and overload capacity of motor.Simultaneously as quiet
Only phase advancer uses closed-loop control, can, motor load variation is automatically tracked, makes motor power factor compensation always in best
State realizes the best match with motor.
However, on the other hand, asynchronous motor rotor circuit string Static Phase Generator but results in the increasing of rotor current
Add, and then result in the increase of rotor windings loss, while rotor-side power factor also being caused to decline, on rotor temperature rise is significant
It rises, to influence motor service life, reduces the efficiency and overload capacity of motor.See on the whole, stator side because go here and there it is static into
Phase device and increased advantage finally by rotor-side because caused by string Static Phase Generator disadvantage offset.
Therefore, although asynchronous motor solves asynchronous motor stator electric current by rotor loop string Static Phase Generator
Greatly, the disadvantage that stator side power factor is low, stator loss is high, but introduce the increase of asynchronous motor rotor electric current, rotor
The problem of side power factor reduces, rotor loss increases.
Summary of the invention
To overcome the shortcomings of the above reactive compensation implementation method, the utility model proposes a kind of wound rotor asynchronous motor function
The control system that rate factor improves, not only increases rotor-side power factor, reduces rotor current, and improve stator side
Power factor reduces stator current, and therefore, the utility model had both reduced rotor windings loss, also reduces stator winding
Loss, improves the efficiency of asynchronous motor；Rotor and stator temperature rise are also reduced simultaneously, improves the overload of asynchronous motor
Ability.
It the purpose of this utility model and solves its technical problem and adopts the following technical solutions to realize.It is practical according to this
A kind of control system of wound rotor asynchronous motor power-factor improvement of novel proposition, including KM1 contactor, KM2 contactor,
RSTStart-up resistor, step-up transformer, tunable capacitor, rotor speed measuring circuit, cpu controller, driver and actuator；It is described
RSTStart-up resistor, step-up transformer, tunable capacitor include a phase, b phase, c phase；
Wherein, the input terminal of the rotor speed measuring circuit is connected with wound rotor asynchronous motor M, rotor speed measurement
The output end of circuit is connected with the input terminal of cpu controller, and the output end of cpu controller is connected with the input terminal of driver, drives
The output end of dynamic device is connected with the input terminal of actuator, the output end of actuator and a phase step-up transformer secondary side tunable capacitor,
B phase step-up transformer secondary side tunable capacitor, c phase step-up transformer secondary side tunable capacitor are connected；A phase step-up transformer one
Secondary side, b phase step-up transformer primary side, c phase step-up transformer primary side are connected with KM2 contactor, KM2 contactor also with around
The a phase of line style asynchronous motor M, b phase, c phase rotor windings are connected；The KM1 contactor and a phase start-up resistor RSTa, b phase
Start-up resistor RSTb, c phase start-up resistor RSTcBe connected, KM1 contactor also with a phase of wound rotor asynchronous motor M, b phase, c phase
Rotor windings are connected.
It the purpose of this utility model and solves its technical problem also following technical scheme can be used to further realize.
The control system of wound rotor asynchronous motor power-factor improvement above-mentioned, wherein pass through the KM1 contactor
Realize the series resistance starting of wound rotor asynchronous motor；Realize that wound rotor asynchronous motor seals in by the KM2 contactor
Capacitor improves power factor；And KM1 contactor and KM2 contactor are not also turned on.
The control system of wound rotor asynchronous motor power-factor improvement above-mentioned, wherein pass through the RSTStarting electricity
The starting of wound rotor asynchronous motor is realized in resistance；Amplify the control signal of cpu controller output by the driver；Pass through
The actuator adjusts the capacitance of variable capacitance.
The control system of wound rotor asynchronous motor power-factor improvement above-mentioned, wherein pass through the cpu controller
Set the stator frequency f of asynchronous motor1, number of pole-pairs np, rotor leakage inductance LlrWith the transformation ratio k of step-up transformer；And the CPU
The revolving speed that controller is measured also according to rotor speed measuring circuit calculates the capacitance for changing variable capacitance, and generates control letter
Number.
The utility model utilizes series resonance principal, seals in capacitor by rotor loop and realizes that the anti-side of leakage inductance is offset in capacitive reactance
Method not only increases rotor-side power factor, reduces rotor current, and improves stator side power factor, reduces and determine
Electron current.Therefore, rotor windings loss had both been reduced, stator winding loss has been also reduced, improves the efficiency of asynchronous motor；
Rotor and stator temperature rise are also reduced simultaneously, improve the overload capacity of asynchronous motor.It can using high transformation ratio step-up transformer
To realize that capacitive reactance becomes smaller method, solves and led since rotor-sided rotor current underfrequency and rotor leakage inductance resist too small
Cause seals in the excessive problem of capacitor's capacity, to reduce costs.
The above description is merely an outline of the technical solution of the present invention, in order to better understand the skill of the utility model
Art means, and in order to allow the above and other objects, features and advantages of the utility model can be more clearly understood, it is special below to lift
Preferred embodiment, and cooperate attached drawing, detailed description are as follows.
Detailed description of the invention
Fig. 1 is the control device block diagram of wound rotor asynchronous motor power-factor improvement.
Fig. 2 is the phasor diagram (inductive load) of wound rotor asynchronous motor.
Fig. 3 is the phasor diagram (resistive load) of wound rotor asynchronous motor.
Specific embodiment
Further to illustrate that the utility model is the technical means and efficacy reaching predetermined goal of the invention and being taken, below
In conjunction with attached drawing and preferred embodiment, to according to the utility model proposes a kind of wound rotor asynchronous motor power-factor improvement
Control system, specific embodiment, structure, feature and its effect, detailed description is as follows.
As shown in connection with fig. 1, on hardware circuit, a kind of wound rotor asynchronous motor power factor of the utility model
Improved control system includes: KM1 contactor, KM2 contactor, RSTStart-up resistor, step-up transformer, tunable capacitor, rotor turn
Fast measuring circuit, cpu controller, driver and actuator.The RSTStart-up resistor, step-up transformer, tunable capacitor include a
Phase, b phase, c phase.
M refers to exchange wound rotor asynchronous motor, the input terminal of rotor speed measuring circuit and winding type asynchronous electricity in Fig. 1
Motivation M be connected, the output end of rotor speed measuring circuit is connected with the input terminal of cpu controller, the output end of cpu controller and
The input terminal of driver is connected, and the output end of driver is connected with the input terminal of actuator, and output end and a phase of actuator are boosted
Circuit Fault on Secondary Transformer tunable capacitor, b phase step-up transformer secondary side tunable capacitor, c phase step-up transformer secondary side tunable capacitor
It is connected；A phase step-up transformer primary side, b phase step-up transformer primary side, c phase step-up transformer primary side are contacted with KM2
Device is connected, and KM2 contactor is also connected with a phase of wound rotor asynchronous motor M, b phase, c phase rotor windings；The KM1 contact
Device and a phase start-up resistor RSTa, b phase start-up resistor RSTb, c phase start-up resistor RSTcIt is connected, KM1 contactor is also different with winding-type
The a phase, b phase, c phase rotor windings for walking motor M are connected.
The hardware circuit of the utility model and its effect are illustrated separately below.
KM1 and KM2 contactor
KM1 contactor is the series resistance starting for wound rotor asynchronous motor；And KM2 contactor is different for winding-type
Step motor seals in capacitor, to improve power factor.KM1 contactor and KM2 contactor are not also turned on.KM1 contactor is only used
KM1 contactor disconnects after starting, starting, and KM2 contactor is connected.
RSTStart-up resistor
RSTStart-up resistor is the starting for wound rotor asynchronous motor, reduces inrush current to reach and increases
The purpose of dynamic torque.
Rotor speed measuring circuit
Rotor speed measuring circuit is used to measure the revolving speed of rotor, to calculate the rotor angular frequency of rotor current.It is described
Rotor speed measuring circuit be a kind of speed measuring device, can be used existing tachometer generator, photoelectric encoder etc. realization.
Step-up transformer
Step-up transformer be in order to reduce due to rotor leakage inductance resist it is too small caused by cross large capacitance, can be used existing
Step-up transformer.
Tunable capacitor
Tunable capacitor be in order to offset in real time because rotor current angular frequency variation caused by rotor loop leakage inductance resistance due to
It is arranged, existing tunable capacitor can be used.
Cpu controller
Cpu controller, on the one hand, for setting some parameters, such as the stator frequency f of setting asynchronous motor1, extremely right
Number np, rotor leakage inductance LlrWith the transformation ratio k of step-up transformer；On the other hand, the revolving speed measured according to rotor speed measuring circuit,
Cpu controller calculates the capacitance for changing variable capacitance according to formula (1) to (6), and then generates control signal, by driver
Control actuator is removed in amplification, so that the capacitance for adjusting variable capacitance is calculated value.The cpu controller can use existing
Singlechip controller or dsp controller etc..
Driver
Driver is a kind of for amplifying the amplifier of the control signal of cpu controller output, is to provide function for actuator
The device of rate (energy).
Actuator
Actuator is used to adjust the capacitance of variable capacitance, and stepper motor can be used.
The control method of wound rotor asynchronous motor power-factor improvement is carried out using control system shown in FIG. 1 are as follows:
It by cpu controller setup parameter, specifically includes: setting the stator frequency f of asynchronous motor1, number of pole-pairs np, turn
Sub- leakage inductance LlrWith the transformation ratio k of step-up transformer；The rotor for measuring asynchronous motor using rotor speed measuring circuit is mechanical
The number of pole-pairs n of revolving speed n and asynchronous motorp, according to formula (1):Calculate the rotor angle of asynchronous motor
Speed omegar；Utilize the stator frequency f of asynchronous motor1, according to formula (2): ω1=2 π f1Calculate the same of asynchronous motor
Walk angular velocity omega1；Utilize the rotor velocity ω of asynchronous motorrWith synchronous angular velocity ω1, according to formula (3): ωs=ω1-
ωrCalculate the angular frequency of rotor currents；Utilize known parameters (the rotor leakage inductance L of asynchronous motorlr) and rotor current angle
Frequencies omegas, according to formula (4): ZL=ωsLlrCalculate the anti-Z of leakage inductance of rotor loopL.Using series resonance principal, according to public affairs
Formula (5):Calculate the equivalent capacity capacitance C' for sealing in asynchronous motor rotor circuit；Using
Know that transformation ratio is the step-up transformer of k, according to formula (6):It calculates and seals in asynchronous motor rotor circuit
Actual capacitance capacitance C.Then, the control signal for changing tunable capacitor capacitance is issued using cpu controller, using driver
To control signal amplification, and then actuator is controlled, achievees the purpose that change tunable capacitor capacitance, to realize improvement asynchronous electric
The power factor of machine.
The calculation formula (1) to (6) is used to calculate the capacitance for realizing rotor loop series resonance.
Fig. 2 is the phasor diagram (inductive load) when wound rotor asynchronous motor does not have series capacitance, and Fig. 3 is winding type asynchronous
Phasor diagram (resistive load) when motor in series resonant capacitance.By Fig. 2 and Fig. 3 compare it can be seen from due to series resonance, make
Rotor loop from original inductive load becomes resistive load so that rotor loop rotor power factor angle becomes 0, and
Rotor current reaches minimum, so that the power-factor angle and stator current in stator circuit also become smaller significantly.
The above descriptions are merely preferred embodiments of the present invention, not makees in any form to the utility model
Limitation, any person skilled in the art do not departing within the scope of technical solutions of the utility model, practical new according to this
The technical spirit of type any simple modification, equivalent change and modification to the above embodiments, still fall within the utility model
In the range of technical solution.
Claims (1)
1. a kind of control system of wound rotor asynchronous motor power-factor improvement, it is characterised in that including KM1 contactor, KM2
Contactor, RSTStart-up resistor, step-up transformer, tunable capacitor, rotor speed measuring circuit, cpu controller, driver and execution
Device；The RSTStart-up resistor, step-up transformer, tunable capacitor include a phase, b phase, c phase；
Wherein, the input terminal of the rotor speed measuring circuit is connected with wound rotor asynchronous motor M, rotor speed measuring circuit
Output end be connected with the input terminal of cpu controller, the output end of cpu controller is connected with the input terminal of driver, driver
Output end be connected with the input terminal of actuator, output end and a phase step-up transformer secondary side tunable capacitor, b phase of actuator
Step-up transformer secondary side tunable capacitor, c phase step-up transformer secondary side tunable capacitor are connected；A phase step-up transformer is primary
Side, b phase step-up transformer primary side, c phase step-up transformer primary side are connected with KM2 contactor, KM2 contactor also with coiling
The a phase of type asynchronous motor M, b phase, c phase rotor windings are connected；The KM1 contactor and a phase start-up resistor RSTa, b phase opens
Dynamic resistance RSTb, c phase start-up resistor RSTcIt is connected, KM1 contactor also turns with a phase of wound rotor asynchronous motor M, b phase, c phase
Sub- winding is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920313593.5U CN209692662U (en) | 2019-03-12 | 2019-03-12 | The control system of wound rotor asynchronous motor power-factor improvement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920313593.5U CN209692662U (en) | 2019-03-12 | 2019-03-12 | The control system of wound rotor asynchronous motor power-factor improvement |
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| Publication Number | Publication Date |
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| CN209692662U true CN209692662U (en) | 2019-11-26 |
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ID=68604607
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| CN201920313593.5U Expired - Fee Related CN209692662U (en) | 2019-03-12 | 2019-03-12 | The control system of wound rotor asynchronous motor power-factor improvement |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109889123A (en) * | 2019-03-12 | 2019-06-14 | 洛阳理工学院 | The control system and control method of wound rotor asynchronous motor power-factor improvement |
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2019
- 2019-03-12 CN CN201920313593.5U patent/CN209692662U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109889123A (en) * | 2019-03-12 | 2019-06-14 | 洛阳理工学院 | The control system and control method of wound rotor asynchronous motor power-factor improvement |
| CN109889123B (en) * | 2019-03-12 | 2024-04-02 | 洛阳理工学院 | Control system and control method for improving power factor of wound-rotor asynchronous motor |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191126 Termination date: 20210312 |