CN205265574U - Brushless double -fed motor's low -cost start structure - Google Patents
Brushless double -fed motor's low -cost start structure Download PDFInfo
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- CN205265574U CN205265574U CN201521124602.4U CN201521124602U CN205265574U CN 205265574 U CN205265574 U CN 205265574U CN 201521124602 U CN201521124602 U CN 201521124602U CN 205265574 U CN205265574 U CN 205265574U
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Abstract
The utility model provides a brushless double -fed motor's low -cost start structure, relates to brushless double -fed motor technical field, and its structure includes the converter, the converter includes the rectifier circuit with the three -phase AC power supply rectified output, connect in the BUS capacitors of rectifier circuit's output (C), the three -phase full bridge inverter (VI) parallelly connected with BUS capacitors (C), be used for control bus electric capacity (C) whether to connect to three -phase full bridge inverter (VI's) control circuit through being equipped with, can be used to break off the direct current output of converter, supply softwareengineer through this low cost of software control start structure again, but the resource of make full use of converter itself, need not use starting resistance promptly, full accuse switch tube device through software control inverter circuit, just can replace starting resistance with control winding (PC) short circuit, can reduce motor corollary equipment's quantity, and reduces cost.
Description
Technical field
The utility model relates to brushless dual-feed motor technical field, and the low cost that particularly relates to a kind of brushless double-fed motor starts structure.
Background technology
Brushless dual-feed motor is a kind of New-type electric machine. Brushless dual-feed motor develops from cascade machine, realizes brushless structure by two cover stator winding (be respectively power winding and control winding) and the rotor of particular design; By the variable voltage variable frequency control of controlling winding being realized to brushless dual-feed motor variable speed constant frequency generator or electrical variable frequency adjustable speed operation. While operation as motor, relate to starting problem. The startup of brushless double-fed motor refers to that motor is 0 to rise to the process of nature synchronous speed N from rotating speed.
At present brushless double-fed motor Starting mode can be divided into synchronous startup and asynchronous starting, and synchronous startup 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 adds power frequency supply excitation, controls winding and adds variable-frequency power sources excitation, controls winding frequency and is increased to 0Hz from-50Hz, and corresponding motor rotating speed just can be increased to N from 0, thus actuating motor. The synchronous problem starting is to need flat-out frequency converter, and this and brushless double-fed motor can use the original intention of part capacity Frequency Converter Control to disagree, so the Starting mode of main flow or asynchronous starting.
Asynchronous starting is that brushless double-fed motor only has power winding to add driving source, controls winding short circuit or configures special starting device, and now motor meets asynchronous machine characteristic. Asynchronous starting particularly need to solve excessive the brought variety of issue of starting current identical while startup with asynchronous machine when high-power brushless double-fed motor asynchronous starting. 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, and still, which has increased electric drilling match equipment and production run cost greatly.
Utility model content
The purpose of this utility model is to avoid weak point of the prior art and provides a kind of low cost of brushless double-fed motor to start structure, can utilize the low cost of this brushless double-fed motor of software control to start structure to realize the object that reduces costs, reduces electric drilling match equipment and cost for software engineer.
The purpose of this utility model is achieved through the following technical solutions:
Provide a kind of low cost of brushless double-fed motor to start structure, comprise frequency converter, described frequency converter comprises the rectification circuit of three-phase alternating-current supply rectification output, is connected to the bus capacitor C of the output of rectification circuit, the three phase full bridge inverter circuit VI in parallel with bus capacitor C, in the utility model, the low cost of described brushless double-fed motor starts structure and comprises the control circuit that whether is connected to three phase full bridge inverter circuit VI for control bus capacitor C.
Described control circuit is bus-tie circuit breaker KD, described bus-tie circuit breaker KDBe serially connected with on the bus between bus capacitor C and three phase full bridge inverter circuit VI.
The input of rectification circuit is connected to frequency converter soft starting circuit.
Described frequency converter soft starting circuit comprises the first K switch M1, soft start resistance R, second switch KM2, input reactance device L, not control rectifying circuit VR of three phase full bridge, three-phase alternating-current supply meets not control rectifying circuit VR of the first K switch M1, second switch KM2, input reactance device L and three phase full bridge successively, and soft start resistance R is in parallel with second switch KM2.
The output of three phase full bridge inverter circuit VI meets the control winding P of brushless double-fed motorC, the power winding P of brushless double-fed motorPBe connected with power frequency supply through the 3rd K switch M3.
The beneficial effects of the utility model:
The low cost of a kind of brushless double-fed motor of the present utility model starts structure, can carry out software control for software engineer, by disconnecting the direct current output of frequency converter, whole switching tube VT1 of the upper and lower brachium pontis of conducting three phase full bridge inverter circuit VI, VT2, VT3, VT4, VT5, VT6 are with short circuit control winding PC, can make full use of frequency converter own resources, do not need to use starting resistance, by the full control switching tube device of software control inverter circuit, just can replace starting resistance will control winding PCShort circuit, the quantity that can reduce electric drilling match equipment, saves cost.
Further, the low cost of a kind of brushless double-fed motor of the present utility model start structure can be for software engineer upper by software control three phase full bridge inverter circuit VI, lower brachium pontis switching tube VT1, VT3, VT5, VT2, VT4, VT6 conducting simultaneously, make electric current on Motor Control winding by upper, the switching device of lower brachium pontis is shared jointly, the electric current that flows through switching device can be greatly reduced, and then the starting current of reduction motor, without special configuration frequency sensitive trheostat or adjustable resistor, also can use the frequency converter that there is no braking circuit, and then the quantity of saving cost and reducing electric drilling match equipment.
Brief description of the drawings
Utilize accompanying drawing to be described further utility model, but the embodiment in accompanying drawing does not form any restriction of the present utility model, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to the following drawings other accompanying drawing.
Fig. 1 is the circuit diagram that the low cost of a kind of brushless double-fed motor of the present utility model starts structure.
Detailed description of the invention
With the following Examples the utility model is further described.
The low cost of a kind of brushless double-fed motor of the present embodiment starts structure, as shown in Figure 1, comprise frequency converter, described frequency converter comprises the rectification circuit of three-phase alternating-current supply rectification output, is connected to the bus capacitor C of the output of rectification circuit, the three phase full bridge inverter circuit VI in parallel with bus capacitor C, in the utility model, the low cost of described brushless double-fed motor starts structure and comprises the control circuit that whether is connected to three phase full bridge inverter circuit VI for control bus capacitor C.
Described control circuit is bus-tie circuit breaker KD, described bus-tie circuit breaker KDBe serially connected with on the bus between bus capacitor C and three phase full bridge inverter circuit VI.
The input of rectification circuit is connected to frequency converter soft starting circuit.
Described frequency converter soft starting circuit comprises the first K switch M1, soft start resistance R, second switch KM2, input reactance device L, not control rectifying circuit VR of three phase full bridge, three-phase alternating-current supply meets not control rectifying circuit VR of the first K switch M1, second switch KM2, input reactance device L and three phase full bridge successively, and soft start resistance R is in parallel with second switch KM2.
The output of three phase full bridge inverter circuit VI meets the control winding P of brushless double-fed motorC, the power winding P of brushless double-fed motorPBe connected with power frequency supply through the 3rd K switch M3.
The low cost of a kind of brushless double-fed motor of the present embodiment starts structure, can carry out software control for software engineer, by disconnecting the direct current output of frequency converter, whole switching tube VT1 of the upper and lower brachium pontis of conducting three phase full bridge inverter circuit VI, VT2, VT3, VT4, VT5, VT6 are with short circuit control winding PC, can make full use of frequency converter own resources, do not need to use starting resistance, by the full control switching tube device of software control inverter circuit, just can replace starting resistance will control winding PCShort circuit, the quantity that can reduce electric drilling match equipment, saves cost.
Further, the low cost of a kind of brushless double-fed motor of the present embodiment starts structure can be for software engineer by software control, and control method is as follows:
This method comprises the following step of carrying out successively:
The first step: be serially connected with bus-tie circuit breaker K by the bus between the bus capacitor C at frequency converter and three phase full bridge inverter circuit VID, and then disconnect bus-tie circuit breaker KDDisconnect the direct current output of frequency converter;
Second step: then whole switching tube VT1 of the upper and lower brachium pontis of conducting three phase full bridge inverter circuit VI, VT2, VT3, VT4, VT5, VT6 are with short circuit control winding PC。
The 3rd step: power frequency supply is added to power winding P by closed the 3rd contactor KM3p, make motor asynchronous starting.
The 4th step: after motor start-up stable operation, closed the first contactor KM1, make three-phase alternating-current supply through soft start resistance R, input reactance device L and three phase full bridge not control rectifying circuit VR come to charge to bus capacitor C, when DC bus-bar voltage reaches after preset range, the closed second contactor KM2 in parallel with soft start resistance R again, complete the soft start of frequency converter, follow closed bus-tie circuit breaker K againD, whole switching tubes of the three phase full bridge inverter circuit VI of shutoff frequency converter, control frequency converter and export suitable frequency to controlling winding PC, the actual speed of this frequency and motor matches, so by motor by power winding PpThe asynchronous operation state of one group of Power supply is transferred to controls winding PCWith power winding PpTwo groups of synchronous operation states that power supply is powered simultaneously.
The 5th step: when motor enters after synchronous operation pattern, control frequency converter and reduce gradually output frequency, until be output as direct current, now brushless double-fed motor just operates in nature synchronous speed N, completes start-up course.
In start-up course, the on off state of contactless contactor state and other gate-controlled switch devices all remains unchanged.
The present embodiment is by controlling upper and lower brachium pontis switching tube VT1, VT3, VT5, VT2, VT4, the VT6 conducting simultaneously of three phase full bridge inverter circuit VI, electric current on Motor Control winding is shared jointly by the switching device of upper and lower brachium pontis, the electric current that flows through switching device can be greatly reduced, and then the starting current of reduction motor, without special configuration frequency sensitive trheostat or adjustable resistor, also can use the frequency converter that there is no braking circuit, and then save the quantity of cost and reduction electric drilling match equipment.
Finally should be noted that; above embodiment is only in order to illustrate the technical solution of the utility model; but not restriction to the utility model protection domain; although the utility model has been done to explain with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify or be equal to replacement the technical solution of the utility model, and not depart from essence and the scope of technical solutions of the utility model.
Claims (5)
1. a brushless double-fed motor low cost starts structure, comprise frequency converter, described frequency converter comprises the rectification circuit of three-phase alternating-current supply rectification output, is connected to the bus capacitor (C) of the output of rectification circuit, the three phase full bridge inverter circuit (VI) in parallel with bus capacitor (C), it is characterized in that: the low cost of described brushless double-fed motor starts structure and comprises the control circuit that whether is connected to three phase full bridge inverter circuit (VI) for control bus electric capacity (C).
2. a kind of brushless double-fed motor low cost as claimed in claim 1 starts structure, it is characterized in that: described control circuit is bus-tie circuit breaker (KD), described bus-tie circuit breaker (KD) be serially connected with on the bus between bus capacitor (C) and three phase full bridge inverter circuit (VI).
3. a kind of brushless double-fed motor low cost as claimed in claim 1 starts structure, it is characterized in that: the input of rectification circuit is connected to frequency converter soft starting circuit.
4. a kind of brushless double-fed motor low cost as claimed in claim 3 starts structure, it is characterized in that: described frequency converter soft starting circuit comprises not control rectifying circuit (VR) of the first switch (KM1), soft start resistance (R), second switch (KM2), input reactance device (L), three phase full bridge, three-phase alternating-current supply connects not control rectifying circuit (VR) of the first switch (KM1), second switch (KM2), input reactance device (L) and three phase full bridge successively, and soft start resistance (R) is in parallel with second switch (KM2).
5. a kind of brushless double-fed motor low cost as claimed in claim 3 starts structure, it is characterized in that: the output of three phase full bridge inverter circuit (VI) meets the control winding (P of brushless double-fed motorC), the power winding (P of brushless double-fed motorP) be connected with power frequency supply through the 3rd switch (KM3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521124602.4U CN205265574U (en) | 2015-12-31 | 2015-12-31 | Brushless double -fed motor's low -cost start structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521124602.4U CN205265574U (en) | 2015-12-31 | 2015-12-31 | Brushless double -fed motor's low -cost start structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205265574U true CN205265574U (en) | 2016-05-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521124602.4U Active CN205265574U (en) | 2015-12-31 | 2015-12-31 | Brushless double -fed motor's low -cost start structure |
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| Country | Link |
|---|---|
| CN (1) | CN205265574U (en) |
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2015
- 2015-12-31 CN CN201521124602.4U patent/CN205265574U/en active Active
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| GR01 | Patent grant |