CN105471340A - Starting structure, starting method and starting device for brushless double-feed motor - Google Patents
Starting structure, starting method and starting device for brushless double-feed motor Download PDFInfo
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- CN105471340A CN105471340A CN201511014220.0A CN201511014220A CN105471340A CN 105471340 A CN105471340 A CN 105471340A CN 201511014220 A CN201511014220 A CN 201511014220A CN 105471340 A CN105471340 A CN 105471340A
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- fed motor
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Abstract
The invention provides a starting structure and a starting method for a brushless double-feed motor, and relates to the technical field of brushless double-feed motors. The starting structure comprises a converter, wherein output of the converter is connected with a control winding P<c> of the brushless double-feed motor; and a power winding P<p> of the brushless double-feed motor is connected to a fundamental frequency power supply through a third switch KM3. According to the starting structure, by a PWM (pulse width modulation) converter, a short circuit device for shorting the power winding P<p> is connected with the power winding and is matched with software control, so that the converter provided by the invention reduces a starting current without a brake circuit or a frequency-sensitive rheostat (or an adjustable resistor), and shorts the control winding P<c> without a starting resistor; only one short circuit device needs to add in hardware structure; low-current and low-cost soft starting of the brushless double-feed motor can be achieved by matching the starting method; the starting structure of the brushless double-feed motor is simple in structure; and the equipment volume can be reduced.
Description
Technical field
The present invention relates to brushless dual-feed motor technical field, particularly relate to a kind of startup structure and starting method of brushless dual-feed motor, the method is by setting up functional module construction, come by computer program computer for controlling system, these computer program instructions store in a computer-readable storage medium.
Background technology
Brushless dual-feed motor is a kind of New-type electric machine.Brushless dual-feed motor develops from cascade machine, (is respectively power winding P by two cover stator winding
pwith controlled winding P
c) and the rotor of particular design realize brushless structure; By to controlled winding P
cvariable voltage variable frequency control realization brushless dual-feed motor variable speed constant frequency generator or electrical variable frequency adjustable speed run.During as motor running, relate to starting problem.The startup of brushless double-fed motor refers to that motor is 0 process rising to nature synchronous speed N from rotating speed.
Current brushless double-fed motor Starting mode can be divided into synchronous averaging and asynchronous starting, and synchronous averaging is that brushless double-fed motor two overlaps stator winding and adds driving source simultaneously, and now motor shows synchronous machine characteristic.Specifically power winding P
padd power frequency supply excitation, controlled winding P
cadd variable frequency power supply excitation, controlled winding P
cfrequency is increased to 0Hz from-50Hz, and corresponding motor rotating speed just can be increased to N from 0, thus actuating motor.The problem of synchronous averaging is to need flat-out frequency converter, and this and brushless double-fed motor can use the original intention of portion capacity Frequency Converter Control to disagree, so the Starting mode of main flow or asynchronous starting.
Asynchronous starting is the power winding P of brushless double-fed motor
padd driving source, controlled winding P
cshort circuit or configure special starting device, now motor meets asynchronous motor properties.Asynchronous starting particularly high-power brushless double-fed motor asynchronous starting time need to solve excessive the brought various problems of starting current identical when starting with asynchronous machine.In order to solve the excessive problem of starting current, the asynchronous starting method that prior art mainly adopts is the Starting mode that special configuration frequency sensitive trheostat or adjustable resistor start, but which considerably increases electric drilling match equipment and production run cost.
Summary of the invention
The object of the invention is to avoid weak point of the prior art and startup structure and starting method that a kind of brushless dual-feed motor is provided, this startup respective outer side edges starting method just both can solve the excessive problem of starting current, solved again the problem that electric drilling match equipment is many and cost is high.
Object of the present invention is achieved through the following technical solutions:
There is provided a kind of startup structure of brushless double-fed motor, comprise frequency converter, the output of described frequency converter meets the controlled winding P of brushless double-fed motor
c, the power winding P of brushless double-fed motor
ppower frequency supply is connected to by the 3rd K switch M3.In the present invention, described frequency converter is PWM formula frequency converter, described power winding P
pbe connected to for short circuit power winding P
pshorted device.
Described shorted device is the 4th contactor KM4, and described shorting contact KM4 is connected to power winding P
pand between the 3rd K switch M3.
The three-phase full-bridge inverting circuit VI that described frequency converter comprises three-phase alternating-current supply uncontrollable rectifier circuit VR, is connected to the bus capacitor C of uncontrollable rectifier circuit VR output, is connected to the output of bus capacitor C, the controlled winding P of the output termination brushless double-fed motor of three-phase full-bridge inverting circuit VI
c.
Described frequency converter also comprises input contactor KM1, soft start resistance R, soft start contactor KM2 and input reactance device L, three-phase alternating-current supply meets input contactor KM1, soft start contactor KM2, input reactance device L and described three phase full bridge uncontrollable rectifier circuit VR successively, and soft start resistance R is in parallel with soft start contactor KM2.
A starting method for brushless double-fed motor, for controlling the startup structure of above-described a kind of brushless double-fed motor, comprises the steps:
A: by power winding P
pshort circuit;
B: increase PWM formula frequency converter gradually and export controlled winding P to
cvoltage magnitude and frequency, the rotating speed of brushless double-fed motor can increase thereupon gradually;
C: when the rotating speed of motor close to synchronous speed and stable after, controls PWM formula frequency converter output controlled winding P corresponding to the actual speed of brushless double-fed motor
cthe excitation of frequency;
D: by power winding P
pthe excitation of access power frequency, pulls brushless double-fed motor into synchronous operation state that two groups of driving sources act on simultaneously by the asynchronous operation state of one group of driving source;
E: after motor enters synchronous operation pattern, control PWM formula frequency converter reduces output frequency gradually, until export continuous current excitation, now brushless double-fed motor operates in nature synchronous speed N, completes the soft start of motor.
Steps A specifically disconnects the 3rd K switch M3, utilizes shorted device by power winding P
pshort circuit.
Steps A is by disconnecting the 3rd K switch M3 further, will be connected to power winding P
pand the 4th contactor KM4 between the 3rd K switch M3 closes to realize power winding P
pshort circuit.
Step D is particular by disconnection the 4th contactor KM4, and closed 3rd K switch M3 realizes power winding P
pthe excitation of access power frequency.
After described steps A before step B, perform steps A 1: disconnect second switch KM2 and the 3rd K switch M3, closed contactor KM1, detect DC bus-bar voltage, after DC bus-bar voltage reaches preset range, closed second switch KM2, completes the soft start of PWM formula frequency converter.
beneficial effect of the present invention:
The startup structure of a kind of brushless double-fed motor of the present invention, by adopting PWM(pulse width modulation) frequency converter of formula, at power winding P
pbe connected to for short circuit power winding P
pshorted device, first utilize shorted device by power winding P
pshort circuit, then control PWM formula frequency converter exports controlled winding P to
cvoltage magnitude and frequency, after waiting the stabilization of speed of brushless double-fed motor, control PWM formula frequency converter exports should the frequency of rotating speed, then by power winding P
pbe connected to power frequency supply, then control frequency converter and reduce output frequency gradually, until export continuous current excitation, then complete the startup structure of brushless double-fed motor, this starting method of startup respective outer side edges of brushless double-fed motor of the present invention, circuit exports controlled winding P to by control PWM formula frequency converter
cvoltage magnitude and frequency change and export controlled winding P to
celectric current, thus replace frequency sensitive trheostat (or adjustable resistor) reduce starting current, without using frequency sensitive trheostat (or adjustable resistor), more without the need to using starting resistance to carry out short circuit controlled winding P
c, hardware configuration only need increase a shorted device, coordinate this starting method just can realize the small area analysis of brushless double-fed motor, the soft start of low cost, the structure of the startup structure of brushless double-fed motor is simple, can reduce equipment volume.
Accompanying drawing explanation
Utilize accompanying drawing to be described further invention, but the embodiment in accompanying drawing does not form any limitation of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the following drawings.
Fig. 1 is the circuit diagram of the asynchronous dynamic structure of a kind of brushless double-fed motor of the present invention.
Embodiment
The invention will be further described with the following Examples.
The startup structure of a kind of brushless double-fed motor of the present embodiment, belong to asynchronous starting structure, as shown in Figure 1, comprise frequency converter, described frequency converter comprises the first contactor KM1, soft start resistance R, soft start second contactor KM2, input reactance device L and three phase full bridge uncontrollable rectifier circuit VR, is connected to the bus capacitor C of the output of rectification circuit, is connected to the three-phase full-bridge inverting circuit VI of the output of bus capacitor C, the controlled winding P of the output termination brushless double-fed motor of three-phase full-bridge inverting circuit VI
c.
Three-phase alternating-current supply meets the first contactor KM1, soft start second contactor KM2, input reactance device L and described three phase full bridge uncontrollable rectifier circuit VR successively, soft start resistance R is in parallel with soft start second contactor KM2, bus capacitor C described in the output termination of described three phase full bridge uncontrollable rectifier circuit VR.
The output of described frequency converter meets the controlled winding P of brushless double-fed motor
c, the power winding P of brushless double-fed motor
pbe connected to power frequency supply by the 3rd contactor KM3, in the present embodiment, described frequency converter is PWM formula frequency converter, described power winding P
pbe connected to the 4th contactor KM4, the 4th contactor KM4 is connected to power winding P
pand between the 3rd contactor KM3.
The control method of the startup structure of above brushless double-fed motor is as follows:
Steps A: disconnect the 3rd contactor KM3, power winding P will be connected to
pand the 4th contactor KM4 between the 3rd contactor KM3 closes to realize power winding P
pshort circuit, brushless double-fed motor is now equivalent to common asynchronous moter;
Steps A 1: disconnect the second contactor KM2 and the 3rd contactor KM3, closed contactor KM1, detects DC bus-bar voltage, and after DC bus-bar voltage reaches preset range, closed KM2, completes the soft start of PWM formula frequency converter.
Step B: increase PWM formula frequency converter gradually and export controlled winding P to
cvoltage magnitude and frequency, the rotating speed of brushless double-fed motor can increase thereupon gradually;
Step C: when the rotating speed of motor close to synchronous speed and stable after, controls PWM formula frequency converter output controlled winding P corresponding to the actual speed of brushless double-fed motor
cthe excitation of frequency;
Step D: disconnect the 4th contactor KM4, closed 3rd contactor KM3 realizes power winding P
pthe excitation of access power frequency, pulls brushless double-fed motor into synchronous operation state that two groups of driving sources act on simultaneously by the asynchronous operation state of one group of driving source;
Step e: after motor enters synchronous operation pattern, control PWM formula frequency converter reduces output frequency gradually, until export continuous current excitation, now brushless double-fed motor operates in nature synchronous speed N, completes the soft start of motor.
In starting process, the on off state of contactor all remains unchanged.
The starting method of a kind of brushless double-fed motor of the present embodiment, belongs to asynchronous starting method, exports controlled winding P to by control PWM formula frequency converter
cvoltage magnitude and frequency change and export controlled winding P to
celectric current, thus replace frequency sensitive trheostat (or adjustable resistor) reduce starting current, can make without using frequency sensitive trheostat (or adjustable resistor), frequency converter without the need to using braking circuit, more without the need to using starting resistance to carry out short circuit controlled winding P
c, hardware configuration only need increase a shorted device, coordinate this starting method just can realize the small area analysis of brushless double-fed motor, the soft start of low cost, the structure of the startup structure of brushless double-fed motor is simple, can reduce equipment volume.
The method provided herein, all or part of step wherein by setting up functional module construction, can have been come by computer program instructions computer for controlling system.These computer program instructions store in a computer-readable storage medium.
Finally should be noted that; above embodiment is only in order to illustrate technical scheme of the present invention; but not limiting the scope of the invention; although done to explain to the present invention with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to technical scheme of the present invention or equivalent replacement, and not depart from essence and the scope of technical solution of the present invention.
Claims (9)
1. a startup structure for brushless double-fed motor, comprises frequency converter, and the output of described frequency converter meets the controlled winding P of brushless double-fed motor
c, the power winding P of brushless double-fed motor
pbe connected to power frequency supply by the 3rd K switch M3, it is characterized in that: described frequency converter is PWM formula frequency converter, described power winding P
pbe connected to for short circuit power winding P
pshorted device.
2. the startup structure of a kind of brushless double-fed motor as claimed in claim 1, is characterized in that: described shorted device is the 4th K switch M4, and described 4th K switch M4 is connected to power winding P
pand between the 3rd K switch M3.
3. the startup structure of a kind of brushless double-fed motor as claimed in claim 1, it is characterized in that: the three-phase full-bridge inverting circuit VI that described frequency converter comprises three-phase alternating-current supply uncontrollable rectifier circuit VR, is connected to the bus capacitor C of uncontrollable rectifier circuit VR output, is connected to the output of bus capacitor C, the controlled winding P of the output termination brushless double-fed motor of three-phase full-bridge inverting circuit VI
c.
4. the startup structure of a kind of brushless double-fed motor as claimed in claim 3, it is characterized in that: described frequency converter also comprises input contactor KM1, soft start resistance R, soft start contactor KM2 and input reactance device L, three-phase alternating-current supply meets input contactor KM1, soft start contactor KM2, input reactance device L and described three phase full bridge uncontrollable rectifier circuit VR successively, and soft start resistance R is in parallel with soft start contactor KM2.
5. a starting drive for brushless double-fed motor, is characterized in that: for controlling the startup structure of a kind of brushless double-fed motor according to claim 1, comprise call successively as lower module:
Modules A: for by power winding P
pshort circuit;
Module B: export controlled winding P to for increasing PWM formula frequency converter gradually
cvoltage magnitude and frequency, the rotating speed of brushless double-fed motor can increase thereupon gradually;
Module C: for the rotating speed when motor close to synchronous speed and stable after, controls PWM formula frequency converter output controlled winding P corresponding to the actual speed of brushless double-fed motor
cthe excitation of frequency;
Module D: for by power winding P
pthe excitation of access power frequency, pulls brushless double-fed motor into synchronous operation state that two groups of driving sources act on simultaneously by the asynchronous operation state of one group of driving source;
Module E: after entering synchronous operation pattern when motor, control PWM formula frequency converter reduces output frequency gradually, until export continuous current excitation, now brushless double-fed motor operates in nature synchronous speed N, completes the soft start of motor.
6. the starting drive of a kind of brushless double-fed motor as claimed in claim 5, is characterized in that: the power winding P of brushless double-fed motor
pbe connected to power frequency supply by the 3rd K switch M3, modules A specifically disconnects the 3rd K switch M3, utilizes shorted device by power winding P
pshort circuit.
7. the starting drive of a kind of brushless double-fed motor as claimed in claim 6, is characterized in that: described shorted device is for being connected to power winding P
pand the 4th K switch M4 between the 3rd K switch M3, modules A is by disconnecting the 3rd K switch M3 further, is closed by the 4th K switch M4 and realizes power winding P
pshort circuit.
8. the starting drive of a kind of brushless double-fed motor as claimed in claim 7, is characterized in that: module D is particular by disconnection the 4th K switch M4, and closed 3rd K switch M3 realizes power winding P
pthe excitation of access power frequency.
9. the starting drive of a kind of brushless double-fed motor as claimed in claim 6, it is characterized in that: described rectification circuit also comprises input contactor KM1, soft start resistance R, soft start contactor KM2 and input reactance device L, three-phase alternating-current supply meets input contactor KM1 successively, soft start contactor KM2, input reactance device L and described three phase full bridge uncontrollable rectifier circuit VR, soft start resistance R is in parallel with soft start contactor KM2, after described modules A before module B, calling module A1: for disconnecting second switch KM2 and the 3rd K switch M3, closed contactor KM1, detect DC bus-bar voltage, after DC bus-bar voltage reaches preset range, closed second switch KM2, complete the soft start of PWM formula frequency converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511014220.0A CN105471340A (en) | 2015-12-31 | 2015-12-31 | Starting structure, starting method and starting device for brushless double-feed motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511014220.0A CN105471340A (en) | 2015-12-31 | 2015-12-31 | Starting structure, starting method and starting device for brushless double-feed motor |
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| Publication Number | Publication Date |
|---|---|
| CN105471340A true CN105471340A (en) | 2016-04-06 |
Family
ID=55608736
Family Applications (1)
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|---|---|---|---|
| CN201511014220.0A Pending CN105471340A (en) | 2015-12-31 | 2015-12-31 | Starting structure, starting method and starting device for brushless double-feed motor |
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| CN106357166A (en) * | 2016-10-12 | 2017-01-25 | 北京中金新源科技有限公司 | Power efficiency energy-saving controller |
| CN106953560A (en) * | 2017-03-13 | 2017-07-14 | 湖南利能科技股份有限公司 | A kind of high-voltage brushless double feedback electric engine heavy load starting control system and method |
| CN107666266A (en) * | 2017-09-21 | 2018-02-06 | Tcl空调器(中山)有限公司 | Transducer air conditioning control method, control device and storage medium |
| CN113236525A (en) * | 2021-06-11 | 2021-08-10 | 西安热工研究院有限公司 | Method for transforming steam-driven water feeding pump into double-fed motor driven water feeding pump and starting method |
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| CN106953560B (en) * | 2017-03-13 | 2023-08-01 | 湖南利能科技股份有限公司 | Heavy-load starting control system and method for high-voltage brushless double-fed motor |
| CN107666266A (en) * | 2017-09-21 | 2018-02-06 | Tcl空调器(中山)有限公司 | Transducer air conditioning control method, control device and storage medium |
| CN113236525A (en) * | 2021-06-11 | 2021-08-10 | 西安热工研究院有限公司 | Method for transforming steam-driven water feeding pump into double-fed motor driven water feeding pump and starting method |
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Application publication date: 20160406 |
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