CN205453568U - Brushless double -fed motor's asynchronous starting structure - Google Patents
Brushless double -fed motor's asynchronous starting structure Download PDFInfo
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- CN205453568U CN205453568U CN201521124687.6U CN201521124687U CN205453568U CN 205453568 U CN205453568 U CN 205453568U CN 201521124687 U CN201521124687 U CN 201521124687U CN 205453568 U CN205453568 U CN 205453568U
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Abstract
Brushless double -fed motor's asynchronous starting structure relates to brushless double -fed motor technical field, and the asynchronous starting structure includes the converter, and brushless double -fed motor's power winding (PP) connects to power frequency power supply through third switch (KM3), the converter includes the rectifier circuit of three -phase AC power supply rectified output (VR), connects in the BUS capacitors (C) of rectifier circuit's (VR) output, connects in the three -phase full bridge inverter (VI) of BUS capacitors's (C) output, three -phase full bridge inverter's (VI) output termination brushless double -fed motor's control winding (PC), rectifier circuit's (VR) input termination has converter soft start circuit, the utility model discloses a brushless double -fed motor's asynchronous starting structure can supply software engineer to control through software, can realize brushless double -fed motor's undercurrent, low -cost soft start, and brushless double -fed motor's asynchronous starting structure's simple structure can reduce the equipment volume.
Description
Technical field
This utility model relates to brushless dual-feed motor technical field, particularly relates to the asynchronous starting structure of brushless double-fed motor.
Background technology
Brushless dual-feed motor is New-type electric machine.Brushless dual-feed motor develops from cascade machine, by two set stator winding (respectively power winding PPWith control winding PC) and the rotor of particular design realize brushless structure；By to controlling winding PCVariable 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.
At present 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 motor characteristic.Specifically power winding PPAdd power frequency supply excitation, control winding PCAdd variable-frequency power sources excitation, control winding PCFrequency increase to 0Hz from-50Hz, corresponding motor rotating speed just can increase to N from 0, thus actuating motor.Synchronous averaging has a problem in that the flat-out converter of needs, and this can use the original intention of portion capacity Frequency Converter Control to disagree with brushless double-fed motor, so the Starting mode of main flow or asynchronous starting.
Asynchronous starting is that brushless double-fed motor two overlaps stator winding and only has a set of winding to add driving source, another set of short circuit in winding or configure special starting device, and now motor meets asynchronous motor properties.Need during asynchronous starting particularly high-power brushless double-fed motor asynchronous starting to solve excessive the brought various problems of starting current identical when starting with asynchronous machine.The problem excessive in order to solve starting current, the asynchronous starting method that prior art mainly uses is special configuration frequency sensitive trheostat or the Starting mode of adjustable resistor startup, but, which considerably increases electric drilling match equipment and production run cost.
Utility model content
The purpose of this utility model is to avoid weak point of the prior art to provide the asynchronous starting structure of brushless double-fed motor, this asynchronous starting structure is available for software engineer and is controlled by software, just can both solve the problem that starting current is excessive, solve again the problem that electric drilling match equipment is many and cost is high.
The purpose of this utility model is achieved through the following technical solutions:
There is provided the asynchronous starting structure of brushless double-fed motor, including converter, the power winding P of brushless double-fed motorPIt is connected to power frequency supply by the 3rd switch KM3, described converter include by three-phase alternating-current supply rectification export rectification circuit, be connected to the outfan of rectification circuit bus capacitor C, be connected to the outfan of bus capacitor C three-phase full-bridge inverting circuit VI, three-phase full-bridge inverting circuit VI output termination brushless double-fed motor control winding PC, in this utility model, the input of described rectification circuit is connected to converter soft starting circuit.
Described rectification circuit includes three phase full bridge uncontrollable rectifier circuit VR, described converter soft starting circuit includes current-limiting circuit and whether is connected to the control circuit of described three phase full bridge uncontrollable rectifier circuit VR for controlling this current-limiting circuit, and the input of described current-limiting circuit terminates the input of described three phase full bridge uncontrollable rectifier circuit VR.
Described current-limiting circuit is soft start resistance R, and described control circuit is second switch KM2, and described soft start resistance R is in parallel with second switch KM2.
Described rectification circuit is further connected with the first switch KM1 and input reactance device L, and three-phase alternating-current supply meets the first switch KM1, converter soft starting circuit, input reactance device L and three phase full bridge uncontrollable rectifier circuit VR successively.
The beneficial effects of the utility model:
The asynchronous starting structure of brushless double-fed motor of the present utility model, by being provided with the soft starting circuit of converter at the rectification circuit of converter, realizes the soft start of converter first with the soft starting circuit of converter, then by the control winding P of statorCShort circuit, at stator power winding PPAccess power frequency supply encourages, and the rotating speed of motor is gradually increased；When motor rotating speed close to synchronous rotational speed and stable after, control converter and export control winding P corresponding with the actual speed of brushless double-fed motorCThe excitation of frequency, the asynchronous operation state of one group of driving source pull brushless double-fed motor into synchronous operation state that two groups of driving sources act on simultaneously；After motor enters synchronous operation pattern, control converter and be gradually reduced output frequency, until output continuous current excitation, now brushless double-fed motor operates in nature synchronous speed N, complete the soft start of motor, this asynchronous soft-start method of the asynchronous starting respective outer side edges of brushless double-fed motor of the present utility model, converter can be made without using braking circuit, without utilizing frequency sensitive trheostat (or adjustable resistor) to reduce starting current, more without using startup resistance to carry out short circuit control winding PCHardware configuration only need to configure a converter soft starting circuit, this asynchronous soft-start method is coordinated to achieve that the soft start of the small area analysis of brushless double-fed motor, low cost, the simple in construction of the asynchronous starting structure of brushless double-fed motor, equipment volume can be reduced.
Accompanying drawing explanation
Utilize accompanying drawing that utility model is described further, but the embodiment in accompanying drawing does not constitute any restriction of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to the following drawings.
Fig. 1 is the circuit diagram of the asynchronous dynamic structure of brushless double-fed motor of the present utility model.
Detailed description of the invention
With the following Examples this utility model is further described.
The asynchronous starting structure of the brushless double-fed motor of the present embodiment, as shown in Figure 1, including converter, described converter include by three-phase alternating-current supply rectification export rectification circuit, be connected to the outfan of rectification circuit bus capacitor C, be connected to the outfan of bus capacitor C three-phase full-bridge inverting circuit VI, three-phase full-bridge inverting circuit VI output termination brushless double-fed motor control winding PC。
Described rectification circuit includes inputting catalyst KM1, soft start resistance R, soft start catalyst KM2, input reactance device L and three phase full bridge uncontrollable rectifier circuit VR, three-phase alternating-current supply meets input catalyst KM1, soft start catalyst KM2, input reactance device L and described three phase full bridge uncontrollable rectifier circuit VR successively, soft start resistance is in parallel with soft start catalyst KM2, and the output of described three phase full bridge uncontrollable rectifier circuit VR terminates described bus capacitor C.
The output of described converter meets the control winding P of brushless double-fed motorC, the power winding P of brushless double-fed motorPIt is connected to power frequency supply by catalyst KM3.
The control method of the asynchronous starting structure of brushless double-fed motor is as follows:
The asynchronous soft-start method of brushless double-fed motor, for being controlled the asynchronous starting structure of above-described brushless double-fed motor, comprises the steps:
A: disconnect soft start catalyst KM2 and catalyst KM3, closes catalyst KM1, detects DC bus-bar voltage, after DC bus-bar voltage reaches preset range, closes soft start catalyst KM2, thus realizes the soft start of converter；
B: under the three-phase of control full bridge inverter VI, the switching tube of brachium pontis VT2, VT4, VT6 simultaneously turns on or on three-phase, the switching tube of brachium pontis VT1, VT3, VT5 simultaneously turns on shorted stator control winding PC；
C: Guan Bi catalyst KM3 realizes at stator power winding PPAccess power frequency supply encourages, and the rotating speed of motor is gradually increased；
D: when motor rotating speed close to synchronous rotational speed and stable after, control converter and export control winding P corresponding with the actual speed of brushless double-fed motorCThe excitation of frequency, the asynchronous operation state of one group of driving source pull brushless double-fed motor into synchronous operation state that two groups of driving sources act on simultaneously；
E: after motor enters synchronous operation pattern, controls converter and is gradually reduced output frequency, until output continuous current excitation, now brushless double-fed motor operates in nature synchronous speed N, completes the soft start of motor.
In start-up course, contactless contactor state all keeps constant.
The asynchronous starting structure of the brushless double-fed motor of the present embodiment, by being provided with the soft starting circuit of converter at the rectification circuit of converter, it is available for software engineer to be controlled by software, and then converter can be made without using braking circuit, without utilizing frequency sensitive trheostat (or adjustable resistor) to reduce starting current, more without using startup resistance to carry out short circuit control winding PCHardware configuration only need to configure a converter soft starting circuit, this asynchronous soft-start method is coordinated to achieve that the soft start of the small area analysis of brushless double-fed motor, low cost, the simple in construction of the asynchronous starting structure of brushless double-fed motor, equipment volume can be reduced.
Finally should be noted that; above example is only in order to illustrate the technical solution of the utility model; rather than the restriction to this utility model protection domain; although having made to explain to this utility model with reference to preferred embodiment; it will be understood by those within the art that; the technical solution of the utility model can be modified or equivalent, without deviating from the spirit and scope of technical solutions of the utility model.
Claims (4)
1. the asynchronous starting structure of brushless double-fed motor, including converter, the power winding (P of brushless double-fed motorP) it is connected to power frequency supply by the 3rd switch (KM3), described converter includes rectification circuit three-phase alternating-current supply rectification exported, is connected to the bus capacitor (C) of the outfan of rectification circuit, is connected to the three-phase full-bridge inverting circuit (VI) of the outfan of bus capacitor (C), the control winding (P of the output termination brushless double-fed motor of three-phase full-bridge inverting circuit (VI)C), it is characterised in that: the input of described rectification circuit is connected to converter soft starting circuit.
2. the asynchronous starting structure of brushless double-fed motor as claimed in claim 1, it is characterized in that: described rectification circuit includes three phase full bridge uncontrollable rectifier circuit (VR), described converter soft starting circuit includes current-limiting circuit and whether is connected to the control circuit of described three phase full bridge uncontrollable rectifier circuit (VR) for controlling this current-limiting circuit, and the input of described current-limiting circuit terminates the input of described three phase full bridge uncontrollable rectifier circuit (VR).
3. the asynchronous starting structure of brushless double-fed motor as claimed in claim 2, it is characterized in that: described current-limiting circuit is soft start resistance (R), described control circuit is second switch (KM2), and described soft start resistance (R) is in parallel with second switch (KM2).
4. the asynchronous starting structure of brushless double-fed motor as claimed in claim 3, it is characterized in that: described rectification circuit is further connected with the first switch (KM1) and input reactance device (L), three-phase alternating-current supply connects the first switch (KM1), converter soft starting circuit, input reactance device (L) and three phase full bridge uncontrollable rectifier circuit (VR) successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521124687.6U CN205453568U (en) | 2015-12-31 | 2015-12-31 | Brushless double -fed motor's asynchronous starting structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521124687.6U CN205453568U (en) | 2015-12-31 | 2015-12-31 | Brushless double -fed motor's asynchronous starting structure |
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| CN205453568U true CN205453568U (en) | 2016-08-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105471341A (en) * | 2015-12-31 | 2016-04-06 | 易事特集团股份有限公司 | Asynchronous starting structure, asynchronous starting method and asynchronous starting device of brushless doubly-fed machine |
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- 2015-12-31 CN CN201521124687.6U patent/CN205453568U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105471341A (en) * | 2015-12-31 | 2016-04-06 | 易事特集团股份有限公司 | Asynchronous starting structure, asynchronous starting method and asynchronous starting device of brushless doubly-fed machine |
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