CN201690304U - Alternating current variable frequency transmission device - Google Patents
Alternating current variable frequency transmission device Download PDFInfo
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- CN201690304U CN201690304U CN2010201790832U CN201020179083U CN201690304U CN 201690304 U CN201690304 U CN 201690304U CN 2010201790832 U CN2010201790832 U CN 2010201790832U CN 201020179083 U CN201020179083 U CN 201020179083U CN 201690304 U CN201690304 U CN 201690304U
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Abstract
The utility model relates to an alternating current variable frequency transmission device applicable to industrial transmission control systems in papermaking, power, metallurgy, coal mines and the like. The alternating current variable frequency transmission device comprises a frequency converter, a variable frequency motor and a coupling, and is structurally characterized in that: the variable frequency motor is a permanent magnet synchronous motor; the frequency converter is connected with a power frequency power supply, and the output end of the frequency converter is connected with the permanent magnet synchronous motor; the output end of the permanent magnet synchronous motor is connected with the coupling; and the coupling is connected with a load. The alternating current variable frequency transmission device overcomes the defects of the prior art, omits a mechanical speed changing box, and can realize low-speed direct drive and speed regulation with frequency variation.
Description
Technical field
The utility model relates to a kind of industrial transmission device, and particularly a kind of AC frequency conversion transmission device is applicable to industrial driving control systems such as papermaking, electric power, metallurgy, colliery.
Background technology
A large amount of variable-frequency motors that use drag loaded work piece machinery in the industrial production at present, usually the industrial transmission device that adopts is referring to Fig. 1, by frequency converter 1 ' control of conversion motor 2 ', variable-frequency motor 2 ' drives the 6 ' work of control load machinery by shaft coupling 3 '---mechanical gear box 4 '---shaft coupling 5 ' again with current signal.The variable-frequency motor 2 ' that this transmission device uses generally is the Asynchronous Frequency-variable buncher, and the Asynchronous Frequency-variable buncher has simple in structure, and reliable operation, the life-span is long, cost is low, the advantage that maintenance is easy.But the generation of its rotating magnetic field needs to draw reactive power from electrical network, so power factor (PF) is low, more so, this has increased the loss of circuit and electrical network greatly during underloading, has lost a large amount of electric energy virtually.Simultaneously, variable-frequency motor needs mechanical gear box 4 ' supporting in this transmission device, not only increases installation cost, and the structure of mechanical gear box 4 ' and lubricating system etc. can cause the appearance of its problem such as gear damage when low speed turns round continuously.
Summary of the invention
Technical problem to be solved in the utility model is, overcomes the defective that prior art exists, and provides a kind of and saves that mechanical gear box, low speed directly drive, the AC frequency conversion transmission device by frequency control.
The technical scheme in the invention for solving the above technical problem is: this AC frequency conversion transmission device, comprise frequency converter, variable-frequency motor and shaft coupling, its design feature is: described variable-frequency motor is a permagnetic synchronous motor, frequency converter is connected with power frequency supply, the output of frequency converter connects permagnetic synchronous motor, the permagnetic synchronous motor output connects shaft coupling, and shaft coupling is connected with load.
Use the permanent magnet synchronous AC machine to substitute the AC frequency conversion transmission device of common variable-frequency motor and mechanical gear box, its frequency converter is transformed to the frequency signal that needs with power frequency supply and flows to permagnetic synchronous motor, rotating speed or torque by the control permagnetic synchronous motor, realization has feedback and does not have the vector control of feeding back permagnetic synchronous motor, passes to stable speed of load and power by shaft coupling.It is little, in light weight, energy-efficient that permanent magnet synchronous motor has a volume, control performance is good, make low speed easily again directly drives, eliminate mechanical reduction gear, can carry out advantages such as speed governing by the variation of frequency, this AC frequency conversion transmission device can be widely used in industrial driving control system.
The utility model AC frequency conversion transmission device, described permagnetic synchronous motor adopts many permanent magnet synchronous motors, and frequency converter is selected independently frequency converter for use.Power to permagnetic synchronous motor with frequency converter independently, the permagnetic synchronous motor rotating speed is strictly followed the power converter frequency and is changed, and this is outer synchronous mode permagnetic synchronous motor operation.
The utility model AC frequency conversion transmission device, the soft start frequency converter that described frequency converter adopts output frequency progressively to rise from low to high.The soft start frequency converter is to solve the starting problem of permagnetic synchronous motor.
The utility model compared with prior art has the following advantages: 1, adopt the permanent magnet synchronous AC machine to adopt the AC frequency conversion gear efficiency height, energy-conservation of common variable-frequency motor and mechanical gear box.At first, the Asynchronous Frequency-variable buncher that common variable-frequency motor adopts is an induction machine, absorb energy from electrical network and set up the motor main field, causes the certain energy loss; And rare earth permanent-magnetic material is installed in the permanent-magnetic synchronous motor rotor, no longer absorb the electrical network energy to set up motor-field, and rotor and stator field synchronous operation, non-inductive electric current in the rotor winding, eliminate rotor resistance copper loss and magnetic hysteresis loss, saved electric energy, improved electric efficiency.Secondly, save mechanical gear box, directly reduce the configuration of transmission device, both reduced energy consumption, reduce the damages such as gear in the transmission device again, improve the transmission device stability in use.2, the employing of permagnetic synchronous motor adopts the Asynchronous Frequency-variable buncher to be beneficial to the quality factor that improve electrical network, reduces the loss of power transmission and transformation line.Permagnetic synchronous motor does not need the induced current excitation, and there is reactive current hardly in stator winding, and the power factor height of motor is near 1; Reduce stator current, stator loss is reduced, further improved efficiency of motor.3, the utility model transmission device detent torque is big, energy index good, velocity accuracy is high.According to frequency converter V/F characteristic, when low-frequency start, though main field is low in the Asynchronous Frequency-variable buncher, power factor is low, starting current is very big, detent torque is very little; And the main field of permagnetic synchronous motor is constant, and stator current all is an active current almost, and starting current is little, detent torque is big.The efficiency curve of Asynchronous Frequency-variable buncher and power factor curve are the peaked wave curve, in the time of when in a single day rated point is left in the motor operation near, the product of electric efficiency and power factor, the energy index that is motor descends rapidly, the frequency control motor velocity variations is big, when the Asynchronous Frequency-variable buncher is worked under 60% load, and its decrease in efficiency 15%, power factor descends 30%, and energy index descends 40%; And the approximate level curve of the efficient of permagnetic synchronous motor and power factor curve, when motor had only 20% load, the energy index of permagnetic synchronous motor still be a fully loaded more than 80%, was beneficial to the service efficiency of raising electric energy and the quality factor of electrical network.Permagnetic synchronous motor itself is a synchronous motor, the given absolute synchronization of motor speed and frequency converter, when particularly dragging several motors with a frequency converter, the velocity accuracy height, this be the Asynchronous Frequency-variable buncher can not compare.4, the motor long service life of the utility model transmission device.Because permagnetic synchronous motor efficient height, current of electric is little, electric machine temperature rise is low, can effectively prolong the useful life of motor.5, the utility model transmission device can reduce frequency inverter capacity.Because of the permanent-magnetic synchronous motor stator electric current is little, can reduces frequency inverter capacity, thereby reduce the power transmission and distribution capacity.
Description of drawings
Fig. 1 is a prior art industry transmission structures block diagram.
Fig. 2 the utility model embodiment AC frequency conversion transmission structures block diagram.
Embodiment
Below by embodiment, in conjunction with the accompanying drawings the utility model is further elaborated.
Example structure is referring to Fig. 1, and this AC frequency conversion transmission device comprises frequency converter 1, variable-frequency motor and shaft coupling 3, and variable-frequency motor is adopted as permagnetic synchronous motor 2.As shown in the figure, frequency converter 1 is connected with power frequency supply, and the output of frequency converter 1 connects permagnetic synchronous motor 2, and shaft coupling 3 two ends connect permagnetic synchronous motor 2 outputs such as grade and load 4 respectively.During work, frequency converter 1 is transformed to the frequency signal that needs with power frequency supply and flows to permagnetic synchronous motor 2; Control requires to select automatically the control of speed control or power according to transmission device, rotating speed or torque by control permagnetic synchronous motor 2, realization has feedback and does not have the vector control of feeding back permagnetic synchronous motor 2, and permagnetic synchronous motor 2 stable speed and power pass to the load 4 that need drive by shaft coupling 3.Use permagnetic synchronous motor 2 to substitute the AC frequency conversion transmission device of existing common variable-frequency motor and mechanical gear box,, directly reduced the equipment investment and the energy consumption of transmission device without mechanical gear box among Fig. 24 ' and shaft coupling 5 '.Simultaneously, the problems such as damage of the mechanical gear box gear when low speed turns round continuously that complements one another with variable-frequency motor have fundamentally been solved.
The operation of permagnetic synchronous motor 2 has outer synchronous mode and motor synchronizing formula two classes.
Independently variable frequency power supply is used in outer synchronous mode permagnetic synchronous motor operation, and promptly frequency converter is powered to permagnetic synchronous motor, and the permagnetic synchronous motor rotating speed is strictly followed the variable frequency power supply frequency and changed.Outer synchronous mode operation is usually used in open loop control, because the strict relationship of rotating speed and frequency, this operational mode is adapted at the occasion of the strict synchronous operation of many permanent magnet synchronous motors and uses, can select the frequency converter of a larger capacity for use, simultaneously to many permanent magnet synchronous motors power supplies, this frequency converter must can be realized soft start, and its output frequency can progressively rise to from low to high to solve the Start-up of Synchronous Motor problem.
The permagnetic synchronous motor of motor synchronizing formula, the rotating magnetic field position that its stator winding produces is determined by the position of p-m rotor, can automatically keep 90 ° space angle is arranged with the rotor field, to produce maximum motor torque, the rotating speed of rotating magnetic field is then strictly determined by the rotating speed of p-m rotor.The permagnetic synchronous motor that moves with this kind mode is except that still needing the inverter switching device circuit, the transducer that also needs an energy detection rotor position, the switch work of inverter, promptly the multiphase current that obtains of permanent-magnetic synchronous motor stator winding is controlled by the signal that detecting apparatus for rotor position provides fully.Self synchronous permagnetic synchronous motor operational mode is analyzed as can be known from principle, and it has the characteristic of DC motor, and stable starting torque is arranged, and can start voluntarily, and can be similar to DC motor motor is carried out closed-loop control.
The use of permagnetic synchronous motor on wind power generation is fairly simple, adds the structure that the wheel hub of being with blade is load with magneto alternator exactly.
Permagnetic synchronous motor material basic parameter is as follows: number of poles 120 utmost points; Normal speed 20rpm; Rated power 1500KW; Unloaded electromotive force 780V; Rated current 1268A; Maximum current 1390A; Load voltage 690V; Stator phase of impedance 17.5mOhm; Stator phase reactance 1.396mH; Rated frequency 20Hz.
Claims (3)
1. AC frequency conversion transmission device, comprise frequency converter, variable-frequency motor and shaft coupling, it is characterized in that: described variable-frequency motor is a permagnetic synchronous motor, frequency converter is connected with power frequency supply, the output of frequency converter connects permagnetic synchronous motor, the permagnetic synchronous motor output connects shaft coupling, and shaft coupling is connected with load.
2. AC frequency conversion transmission device according to claim 1 is characterized in that: described permagnetic synchronous motor adopts many permanent magnet synchronous motors, and frequency converter is selected independently frequency converter for use.
3. AC frequency conversion transmission device according to claim 2 is characterized in that: the soft start frequency converter that described frequency converter adopts output frequency progressively to rise from low to high.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201790832U CN201690304U (en) | 2010-04-30 | 2010-04-30 | Alternating current variable frequency transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201790832U CN201690304U (en) | 2010-04-30 | 2010-04-30 | Alternating current variable frequency transmission device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201690304U true CN201690304U (en) | 2010-12-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201790832U Expired - Fee Related CN201690304U (en) | 2010-04-30 | 2010-04-30 | Alternating current variable frequency transmission device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201690304U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208830A (en) * | 2016-08-29 | 2016-12-07 | 山东欧瑞安电气有限公司 | A kind of plastic granulating reactor permanent magnet direct-drive system |
| CN109236177A (en) * | 2018-11-26 | 2019-01-18 | 天津市东睿泰合科技有限公司 | A kind of asynchronously or synchronously motor-driven drill power system |
-
2010
- 2010-04-30 CN CN2010201790832U patent/CN201690304U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208830A (en) * | 2016-08-29 | 2016-12-07 | 山东欧瑞安电气有限公司 | A kind of plastic granulating reactor permanent magnet direct-drive system |
| CN109236177A (en) * | 2018-11-26 | 2019-01-18 | 天津市东睿泰合科技有限公司 | A kind of asynchronously or synchronously motor-driven drill power system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20101229 Termination date: 20160430 |