CN205304654U - Brushless double -fed motor's asynchronous soft start structure - Google Patents
Brushless double -fed motor's asynchronous soft start structure Download PDFInfo
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- CN205304654U CN205304654U CN201521124972.8U CN201521124972U CN205304654U CN 205304654 U CN205304654 U CN 205304654U CN 201521124972 U CN201521124972 U CN 201521124972U CN 205304654 U CN205304654 U CN 205304654U
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Abstract
The utility model provides a brushless double -fed motor's asynchronous soft start structure, relates to brushless double -fed motor technical field, and the asynchronous starting structure includes the converter, the output of converter meets brushless double -fed motor's control winding PC, and brushless double -fed motor's power winding PP connects to power frequency power supply through contactor KM3, the utility model discloses in, through the converter that adopts PWM ( pulse width modulation ) formula, connecing the short circuit device that is used for short circuit power winding PP at power winding PP, the software control of deuterogamying makes the utility model discloses a converter need not to use the braking circuit, also need not to utilize frequency sensitive rheostat (or adjustable resistor ) to reduce the pick -up current, more need not to use starting resistance to come short circuit control winding, only needs to increase a short circuit device on hardware architecture, and the cooperation software control just can realize brushless double -fed motor's undercurrent, the soft start of low cost, and brushless double -fed motor's asynchronous soft start 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 soft start structure of a kind of brushless double-fed motor.
Background technology
Brushless dual-feed motor is a kind of New-type electric machine. Brushless dual-feed motor develops from cascade machine, overlaps stator winding (respectively power winding P by twoPWith control winding PC) and the rotor of particular design realize brushless structure; By the variable voltage variable frequency control realization brushless dual-feed motor variable speed constant frequency generator or electrical variable frequency adjustable speed that control winding are 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 motor characteristic. Specifically power winding PPAdding power frequency supply excitation, control winding and add variable-frequency power sources excitation, control to increase to 0Hz around class frequency 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 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 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 the various problems that starting current identical when starting is excessive brought with asynchronous machine. The problem excessive in order to solve starting current, the asynchronous starting method that prior art mainly adopts 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 in that to avoid weak point of the prior art to provide the asynchronous soft start structure of a kind of brushless double-fed motor, this asynchronous soft start respective outer side edges software controls just can both solve the problem that starting current is excessive, solves again the problem that volume is big and cost is high.
The purpose of this utility model is achieved through the following technical solutions:
Thering is provided the asynchronous soft start structure of a kind of brushless double-fed motor, including converter, the output of described converter meets the control winding P of brushless double-fed motorC, the power winding P of brushless double-fed motorPSwitch KM3 by the 3rd and be connected to power frequency supply. In this utility model, described converter is PWM formula converter, described power winding PPIt is connected to for short circuit power winding PPShorted device.
Described shorted device is the 4th switch KM4, and described 4th switch KM4 is connected to power winding PpAnd between 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��
Described rectification circuit is three phase full bridge uncontrollable rectifier circuit VR, and the output of described three phase full bridge uncontrollable rectifier circuit VR terminates described bus capacitor C.
Described rectification circuit also includes the first switch KM1, soft start resistance R, second switch KM2 and input reactance device L, three-phase alternating-current supply meets the first switch KM1, second switch KM2, input reactance device L and described three phase full bridge uncontrollable rectifier circuit VR successively, and soft start resistance is in parallel with second switch KM2.
The beneficial effects of the utility model:
The asynchronous soft start structure of a kind of brushless double-fed motor of the present utility model, by adopting PWM(pulse width modulation) converter of formula, at power winding PPIt is connected to for short circuit power winding PPShorted device, first with shorted device by power winding PPShort circuit, then control the electric voltage frequency of converter output and amplitude carrys out starting brushless doubly-fed motor, after waiting the stabilization of speed of brushless double-fed motor, control converter output to should the frequency of rotating speed, then by power winding PPIt is connected to power frequency supply, then control converter and be gradually reduced output frequency, until output continuous current excitation, then complete the asynchronous soft start structure of brushless double-fed motor, converter of the present utility model is without using braking circuit, starting current is reduced without utilizing frequency sensitive trheostat (or adjustable resistor), more without using startup resistance to carry out short circuit control winding, hardware configuration only need to increase a shorted device, software is coordinated to control to achieve that the small area analysis of brushless double-fed motor, the soft start of low cost, the simple in construction of the asynchronous soft start 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, under the premise 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 a kind 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 soft start structure of a kind of brushless double-fed motor of the present embodiment, as it is shown in figure 1, include converter, the output of described converter meets the control winding P of brushless double-fed motorC, the power winding P of brushless double-fed motorPBeing connected to power frequency supply by catalyst KM3, in this utility model, described converter is PWM formula converter, described power winding PPIt is connected to for short circuit power winding PPShorted device.
Described shorted device is catalyst KM4, and described catalyst KM4 is connected to power winding PpAnd between catalyst 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��
Described rectification circuit is three phase full bridge uncontrollable rectifier circuit VR, and the output of described three phase full bridge uncontrollable rectifier circuit VR terminates described bus capacitor C.
Described rectification circuit also includes input catalyst KM1, soft start resistance R, soft start catalyst KM2 and input reactance device L, 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, and soft start resistance is in parallel with soft start catalyst KM2.
The asynchronous soft start structure of the present embodiment, is controlled by following control mode:
Step A: disconnect catalyst KM3, realizes the catalyst KM4 Guan Bi in parallel with catalyst KM3 power winding PPShort circuit, brushless double-fed motor is now equivalent to common asynchronous moter;
Step A1: disconnect catalyst KM2 and catalyst KM3, closes catalyst KM1, detects DC bus-bar voltage, after DC bus-bar voltage reaches preset range, closes KM2, completes the soft start of PWM formula converter.
Step B: incrementally increasing the output of PWM formula converter to the voltage magnitude and the frequency that control winding, the rotating speed of brushless double-fed motor can be gradually increased therewith;
Step C: when motor rotating speed close to synchronous rotational speed and stable after, control the excitation of the frequency of PWM formula converter output control corresponding to the actual speed of brushless double-fed motor winding;
Step D: disconnecting catalyst KM4, Guan Bi catalyst KM3 realizes power winding PPAccess power frequency encourages, 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;
Step E: after motor enters synchronous operation pattern, controls PWM formula 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 starting process, contactless contactor state all remains unchanged.
The asynchronous soft start structure of a kind of brushless double-fed motor of the present embodiment, by adopting PWM(pulse width modulation) converter of formula, at power winding PPIt is connected to for short circuit power winding PPShorted device, first with shorted device by power winding PPShort circuit, then control the electric voltage frequency of converter output and amplitude carrys out starting brushless doubly-fed motor, after waiting the stabilization of speed of brushless double-fed motor, control converter output to should the frequency of rotating speed, then by power winding PPIt is connected to power frequency supply, then control converter and be gradually reduced output frequency, until output continuous current excitation, then complete the asynchronous soft start structure of brushless double-fed motor, converter of the present utility model is without using braking circuit, starting current is reduced without utilizing frequency sensitive trheostat (or adjustable resistor), more without using startup resistance to carry out short circuit control winding, hardware configuration only need to increase a shorted device, software is coordinated to control to achieve that the small area analysis of brushless double-fed motor, the soft start of low cost, the simple in construction of the asynchronous soft start 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; but not 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 replacement, without deviating from the spirit and scope of technical solutions of the utility model.
Claims (5)
1. an asynchronous soft start structure for brushless double-fed motor, including converter, the output of described converter meets the control winding (P of brushless double-fed motorC), the power winding (P of brushless double-fed motorP) it is connected to power frequency supply by the 3rd switch (KM3), it is characterised in that: described converter is PWM formula converter, described power winding (PP) be connected to for short circuit power winding (PP) shorted device.
2. the asynchronous soft start structure of a kind of brushless double-fed motor as claimed in claim 1, it is characterised in that: described shorted device is the 4th switch (KM4), and described 4th switch (KM4) is connected to power winding (PP) and the 3rd switch (KM3) between.
3. the asynchronous soft start structure of a kind of brushless double-fed motor as claimed in claim 1, it is characterized in that: rectification circuit that described converter includes exporting three-phase alternating-current supply rectification, be connected to the bus capacitor (C) of the outfan of rectification circuit, be 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).
4. the asynchronous soft start structure of a kind of brushless double-fed motor as claimed in claim 3, it is characterized in that: described rectification circuit is three phase full bridge uncontrollable rectifier circuit (VR), the output of described three phase full bridge uncontrollable rectifier circuit (VR) terminates described bus capacitor (C).
5. the asynchronous soft start structure of a kind of brushless double-fed motor as claimed in claim 4, it is characterized in that: described rectification circuit also includes the first switch (KM1), soft start resistance (R), second switch (KM2) and input reactance device (L), three-phase alternating-current supply connects the first switch (KM1), second switch (KM2), input reactance device (L) and described three phase full bridge uncontrollable rectifier circuit (VR) successively, and soft start resistance is in parallel with second switch (KM2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201521124972.8U CN205304654U (en) | 2015-12-31 | 2015-12-31 | Brushless double -fed motor's asynchronous soft start structure |
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| CN201521124972.8U CN205304654U (en) | 2015-12-31 | 2015-12-31 | Brushless double -fed motor's asynchronous soft start structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105471340A (en) * | 2015-12-31 | 2016-04-06 | 易事特集团股份有限公司 | Starting structure, starting method and starting device for brushless double-feed motor |
| 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 |
-
2015
- 2015-12-31 CN CN201521124972.8U patent/CN205304654U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105471340A (en) * | 2015-12-31 | 2016-04-06 | 易事特集团股份有限公司 | Starting structure, starting method and starting device for brushless double-feed motor |
| 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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