CN203883734U - Low-harmonic-wave full-digital random PWM technology high-speed control frequency conversion apparatus - Google Patents
Low-harmonic-wave full-digital random PWM technology high-speed control frequency conversion apparatus Download PDFInfo
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- CN203883734U CN203883734U CN201420258355.6U CN201420258355U CN203883734U CN 203883734 U CN203883734 U CN 203883734U CN 201420258355 U CN201420258355 U CN 201420258355U CN 203883734 U CN203883734 U CN 203883734U
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Abstract
The utility model discloses a low-harmonic-wave full-digital random PWM technology high-speed control frequency conversion apparatus including a power and control unit, a motor, a user interface, and a user power supply, the input end of a three-phase AC power supply is connected with the power and control unit, the power and control unit is connected with the motor, the user interface, and the user power supply, the power and control unit includes a leakage-protector and air-switch contactor, a frequency converter, a DC reactor, a brake unit, and a brake resistor, the leakage-protector and air-switch contactor is connected with an input AC reactor and an input AC filter, the input AC reactor and the input AC filter are connected with the frequency converter, the frequency converter is connected with the DC reactor, the brake unit, the brake resistor, an output AC reactor, and the input AC filter, and the brake unit is connected with the brake resistor. The apparatus provided is reliable in work, simple in maintenance, obvious in energy-saving effect, and high in practicality, has no pollution to electrical network, as well as can be used as a substitute for a conventional speed regulation energy-saving device.
Description
Technical field
The utility model relates to a kind of converter plant, is specifically related to the digital random PWM technology high-speed of low harmonic wave and controls converter plant.
Background technology
Along with improving constantly of self-turn-off device technical merit, pulse modulation technology also reaches its maturity, PWM ac variable frequency speed regulation, with its high efficiency, High Power Factor, good output waveform, advantages of simple structure and simple, is widely applied in the equipment such as Underground Fan, water pump, paper machine.The basic principle of variable-frequency control technique is the relation being directly proportional to working power incoming frequency according to motor speed, by changing motor working power frequency, reach the object that changes motor speed, it is substantially all to adopt space vector random PWM that current PWM technology high-speed is on the market controlled converter plant, realization is to the soft start of motor and stepless speed control, its corresponding speed is fast not, noise is large, not high for the degree of regulation of level and smooth stepless time adjustment.
Utility model content
Because the above-mentioned defect of prior art, the utility model provides the digital random PWM technology high-speed of a kind of low harmonic wave to control converter plant, realized reliable operation, safeguard simple, pollution-free to electrical network, energy-saving effect obviously practical, can substitute traditional speed-regulating energy-saving device.
For achieving the above object, the utility model provides the digital random PWM technology high-speed of low harmonic wave to control converter plant, comprise power and control unit, motor, user interface and user's power supply, three-phase alternating-current supply input is connected with control unit with power, and power is connected with motor, user interface and user's power supply respectively with control unit; Described power and control unit comprise that leaking guarantor's sky opens contactor, frequency converter, direct current reactor, brake unit and brake resistance, leakage guarantor sky is driven contactor and is connected with input AC reactor, input AC filter, input AC reactor, input AC filter are all connected with frequency converter, frequency converter is connected with direct current reactor, brake unit, brake resistance, output AC reactor and input AC filter respectively, and brake unit is connected with brake resistance.
As preferably, described frequency converter is also connected with user's power supply 4 with user interface 3 respectively.
As preferably, described output AC reactor is all connected with motor 2 with input AC filter 19.
The beneficial effects of the utility model:
1, high-speed response, low noise, low harmonic wave, on a large scale, the level and smooth stepless speed regulation of high accuracy; There is general external interface terminal, can same computer, PLC is online, is convenient to realize automatic control; Inside establish function many, can meet different process requirement; Soft start, soft stop, have electric current restriction and slip compensation is controlled; The starting of motor direct-on-line, starting torque is large, and starting current is little, reduces the impact to electrical network and equipment, and has torque magnification function, saves soft starter device;
2, power factor is high, saves Electric capacity compensation device; Be combined with squirrel-cage rotor motor, make governing system safeguard simple economy more; Defencive function is perfect, easy maintenance; Volume is little, lightweight, and floor space is little.
3, harmonic content is low, digital random PWM is controlled motor, and harmonic content requires far below national standard and other frequency converter at the same level, and rotating speed control precision is high, frequency converter static accuracy >=99.8% that digital random PWM is controlled, meets the requirement of blower fan, load of the pumps completely.
4, control mode is flexible: can realize the conversion of speed governing operation and full speed running, open loop operation and operation with closed ring conversion (or manually operation and the conversion of operation automatically), control the conversion of controlling with a distant place on the spot.Can conveniently realize with DCS system or other computer network and being connected.
5, two 485 communication ports, two 485 communication ports are supported MODBUS agreement, the practicable Long-distance Control kit function of standard operation panel, 600 meters farthest, expansion card: user's secondary development card, molding machine interface card, PG feedback card, air compressor machine control card, communications adapter, Power Supply Monitoring card, phase sequence test card etc.;
6, power-on self-test function: carry out inner and outside power-on self-test, if motor is with capacitive load, motor ground connection ,+10V power supply output abnormality, simulation output abnormality, broken string etc.
Below with reference to accompanying drawing, the technique effect of design of the present utility model, concrete structure and generation is described further, to understand fully the purpose of this utility model, feature and effect.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Embodiment
With reference to Fig. 1, this embodiment is by the following technical solutions: the digital random PWM technology high-speed of low harmonic wave is controlled converter plant, comprise power and control unit 1, motor 2, user interface 3 and user's power supply 4, three-phase alternating-current supply input is connected with control unit 1 with power, and power is connected with motor 2, user interface 3 and user's power supply 4 respectively with control unit 1; Described power and control unit 1 comprise that leaking guarantor's sky opens contactor 11, frequency converter 14, direct current reactor 15, brake unit 16 and brake resistance 17, leakage guarantor sky is driven contactor 11 and is connected with input AC reactor 12, input AC filter 13, input AC reactor 12, input AC filter 13 are all connected with frequency converter 14, frequency converter 14 is connected with direct current reactor 15, brake unit 16, brake resistance 17, output AC reactor 18 and input AC filter 19 respectively, and brake unit 16 is connected with brake resistance 17.
User interface 3 in this embodiment comprises analog quantity IO terminal, relay output interface key-press input interface, serial bus interface, switching value IO terminal, pulse IO terminal, LED/LCD display interface and fieldbus; User's power supply 4 comprises the multiple power sources such as 10V, 24V.
What above-mentioned power and control unit 1 adopted is existing control module, and its existing control module has multiple, existing not burden in addition.The utility model connects combination by existing module, has realized reliable operation, safeguards the digital random PWM technology high-speed control of the obvious practical low harmonic wave of simple, pollution-free to electrical network, energy-saving effect converter plant, can substitute traditional speed-regulating energy-saving device.
The operation principle of this embodiment is as follows:
The basic principle that random PWM is controlled is by Measurement for Inverter output voltage wave mode and asynchronous motor stator current phasor, according to existing direct computation of DFT computing formula and field orientation principle, respectively the exciting voltage of asynchronous motor and torque current are controlled, thereby reached the object of controlling induction motors torque.
Concrete way is: stator current Ia, the Ib by asynchronous motor under three phase coordinate systems, Ic, by three-phase～bis-phase inversion, equivalence becomes the alternating current Ia1Ib1 under two-phase rest frame, by pressing rotor field-oriented rotation transformation, (Im1 is equivalent to the exciting current of DC motor for direct current Im1, It1 under equivalence one-tenth synchronous rotating frame again; It1 is equivalent to the armature supply being directly proportional to torque), then imitate the control method of DC motor, try to achieve the controlled quentity controlled variable of DC motor, through corresponding coordinate inverse transformation, realize the control to asynchronous motor.Its essence is alternating current motor is equivalent to DC motor, respectively to speed, two, magnetic field component carries out independent control.
By controlling rotor flux, then decompose stator current and obtain torque and two, magnetic field component, through coordinate transform, realize quadrature or decoupling zero and control.
This embodiment reliable operation, safeguard simple, pollution-free to electrical network, energy-saving effect obviously practical, can substitute traditional speed-regulating energy-saving device.
More than describe preferred embodiment of the present utility model in detail.Should be appreciated that those of ordinary skill in the art just can make many modifications and variations according to design of the present utility model without creative work.Therefore, all technical staff in the art comply with design of the present utility model on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment, all should be in the determined protection range by claims.
Claims (3)
1. the digital random PWM technology high-speed of low harmonic wave is controlled converter plant, it is characterized in that, comprise power and control unit (1), motor (2), user interface (3) and user's power supply (4), three-phase alternating-current supply input is connected with control unit (1) with power, and power is connected with motor (2), user interface (3) and user's power supply (4) respectively with control unit (1), described power and control unit (1) comprise that leaking guarantor's sky drives contactor (11), frequency converter (14), direct current reactor (15), brake unit (16) and brake resistance (17), leak guarantor's sky and drive contactor (11) and input AC reactor (12), input AC filter (13) is connected, input AC reactor (12), input AC filter (13) is all connected with frequency converter (14), frequency converter (14) respectively with direct current reactor (15), brake unit (16), brake resistance (17), output AC reactor (18) is connected with input AC filter (19), brake unit (16) is connected with brake resistance (17).
2. the digital random PWM technology high-speed of low harmonic wave according to claim 1 is controlled converter plant, it is characterized in that, described frequency converter (14) is also connected with user's power supply (4) with user interface (3) respectively.
3. the digital random PWM technology high-speed of low harmonic wave according to claim 1 is controlled converter plant, it is characterized in that, described output AC reactor (18) is all connected with motor (2) with input AC filter (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420258355.6U CN203883734U (en) | 2014-05-21 | 2014-05-21 | Low-harmonic-wave full-digital random PWM technology high-speed control frequency conversion apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420258355.6U CN203883734U (en) | 2014-05-21 | 2014-05-21 | Low-harmonic-wave full-digital random PWM technology high-speed control frequency conversion apparatus |
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| CN203883734U true CN203883734U (en) | 2014-10-15 |
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| CN201420258355.6U Expired - Fee Related CN203883734U (en) | 2014-05-21 | 2014-05-21 | Low-harmonic-wave full-digital random PWM technology high-speed control frequency conversion apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993730A (en) * | 2015-07-10 | 2015-10-21 | 河南理工大学 | Transforming method of random space vector PWM strategies |
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2014
- 2014-05-21 CN CN201420258355.6U patent/CN203883734U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993730A (en) * | 2015-07-10 | 2015-10-21 | 河南理工大学 | Transforming method of random space vector PWM strategies |
| CN104993730B (en) * | 2015-07-10 | 2017-04-19 | 河南理工大学 | Transforming method of random space vector PWM strategies |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141015 Termination date: 20160521 |
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| CF01 | Termination of patent right due to non-payment of annual fee |