CN1224153A - Electrically enclosed AC variable frequency asynchronous dynamometering machine system - Google Patents
Electrically enclosed AC variable frequency asynchronous dynamometering machine system Download PDFInfo
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- CN1224153A CN1224153A CN 98112319 CN98112319A CN1224153A CN 1224153 A CN1224153 A CN 1224153A CN 98112319 CN98112319 CN 98112319 CN 98112319 A CN98112319 A CN 98112319A CN 1224153 A CN1224153 A CN 1224153A
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Abstract
A work measuring system is composed of two inverters, two squirrel-cage asynchronous motors, a frequency controller and two shaft couplers. Two inverters, between which a frequency controller is connected, are respectively connected with two squirrel-cage asynchronous motors. Said motors are connected via shaft couplers to the rotating part of the machine to be measured. It features use of a rectifier unit with inputs connected to three-phase AC power network and outputs to form DC bus directly connected to two inverters.
Description
The present invention relates to the electrically enclosed AC variable frequency asynchronous electric motor type electric dynamometer system of a kind of measurement variator (as gear-shift mechanism, fluid torque-converter, transmission for vehicles and transfer gear etc.) torque, rotating speed, power, efficient and characteristic etc.
At present, the traditional measuring system of variator mainly contains following two types, and the one, the open dynamometer system of power circuit, the 2nd, the closed dynamometer system of power circuit.The open dynamometer system of power circuit, its testing equipment is made up of three parts, thick motivation, tried toothed gearing and the power consumption load device.Its power just flows to the power consumption load device by prime mover, and power circuit is opening, and the test energy becomes heat energy and all is consumed.The power consumption load device that adopts has mechanical brake, magnetic powder brake, eddy current absorption dynamometer, hydraulic dynamometer and Electric Dynamometer etc.The major advantage of this class pilot system is that structure is simpler, flexible configuration, and equipment investment is relatively low.But the shortcoming of its maximum is to cause very big energy dissipation.In order to regain the test energy, energy savings, people generally use the closed dynamometer system of power circuit, be that power flows to charger by prime mover, except that the essential power attenuation of system, all the other power return to prime mover by charger, constitute the closed system of power circuit.Comprising two types again, is respectively that mechanical output stream is closed and electrical power flow is closed.Both compare, and electric closed system structure is comparatively simple, adds carried convenient, and accuracy of measurement is higher.The electricity closed system mainly contains following two kinds, the one, direct current generator formula electricity closed system, it by two it encourage the direct current that the direct current dynamometer motor forms and seal power-measuring system.The rotating part of two motors is connected to each other, the public direct current network of armature winding input in parallel.Regulate the exciting current of two motors, make one to do the motor operation, another is made generator and loads.The electric energy that generator sends feeds back to direct current network through armature winding.The advantage of this system is an energy savings, and is simple in structure, speed governing and add carried convenient, but because direct current generator has commutator, complex structure, power-carrying and limit speed are very restricted, and are difficult to satisfy high-speed, high capacity Testing requirement.The high-precision requirement of measuring also is difficult to reach.
Above technology derives from Dec, 1988 China Machine Press and publishes " experimental technique of gear and equipment " book that Zhu's filial piety record etc. is write.The 2nd, AC induction motor formula electricity closed system, though the DC motor speed-regulating performance is good, complex structure.Compare with direct current generator, mouse cage AC formula asynchronous machine is simple in structure, and is firm reliable, safeguards that high speed performance is good easily.Therefore AC speed regulating is the target that people pursue for a long time all the time.Because the develop rapidly of Power Electronic Technique, the AC converter of superior performance have obtained using widely, have replaced DC speed regulation in a lot of fields.Existing electrically enclosed AC variable frequency asynchronous dynamometer system, include frequency converter, the squirrel-cage asynchronism dynamometer motor, shaft coupling, a frequency converter links to each other on circuit with a squirrel-cage asynchronism dynamometer motor, another frequency converter links to each other on circuit with another squirrel-cage asynchronism dynamometer motor, two dynamometer motors are connected to each other by the rotating part of shaft coupling and tested machinery, two frequency converters are connected with three phase network, power by three phase network, regulate the frequency of frequency converter, make a dynamometer motor do the motor operation by inverter supply, drag another dynamometer motor by tested machinery and make generator operation by inverter supply, generated energy is fed back to three phase network by frequency converter, constitute the electric closed system of power circuit.The dynamometer machine that Switzerland AVL company produces is exactly this type, can directly be used for forming this electric closed system.The advantage of this system is that the test energy obtains reclaiming, and has saved the energy; Adopted simple in structurely, firm reliable, safeguarded easily, the squirrel-cage asynchronism dynamometer motor that high speed performance is good, the high capacity of measuring equipment, high-speed, high-precision requirement more easily reach; Adopted variable-frequency control technique ripe, superior performance, defencive function is strong, the good reliability of equipment, automatization level height.In addition, this conductively closed formation is will make the electric power that the dynamometer machine of generating load operating sends to turn back to the three-phase alternating current electrical network by frequency converter, again by electrical network to the power supply of measurement of power motor, it is the electric power closed system that constitutes by three phase network.Also there is the problem of two aspects at present in this system, the one, must adopt frequency converter with four quadrant running or special inversion to return net arrangement, have a large capacity and a wide range and can not adopt, price relatively cheap many plain edition PWM frequency converters.Bigger problem is that electric power is returned net by the frequency converter inversion and can be brought the different harmonic pollution of degree to electrical network.And place capacity is big more, influences also serious more.In order to suppress the interference of harmonic wave to electrical network, must take a series of interference protection measure, increased the equipment gross investment, and problem still can not get thorough solution, therefore, preventing to cause the electrical network public hazards is the problem that this type systematic faced all the time.
The object of the present invention is to provide a kind of electrically enclosed AC variable frequency asynchronous dynamometer system of the electric power inner loop of using for transmission test.
The present invention includes inverter, the squirrel-cage asynchronism dynamometer motor, frequency controller, shaft coupling, an inverter links to each other on circuit with a squirrel-cage asynchronism dynamometer motor, another inverter links to each other on circuit with another squirrel-cage asynchronism dynamometer motor, be connected with frequency controller between two inverters, two dynamometer motors are connected to each other by the rotating part of shaft coupling and tested machinery, it is characterized in that also comprising a rectification unit, the input termination three-phase alternating current net of rectification unit, output terminal constitutes the direct current bus-bar, two inverters are parallel-connected on the direct current bus-bar, when electrically enclosed AC variable frequency asynchronous dynamometer system is worked, two inverters are output as two dynamometer motors provides the AC frequency conversion power supply, when increasing the frequency of a dynamometer motor or reducing the frequency of another dynamometer motor by frequency controller, can make wherein one to do the motor operation, another supersynchronous speed is made the generator load operating, the alternating current that is sent returns to motor by inverter, so constituted the electric power round-robin electricity closed system of asynchronous generator and asynchronous motor inside, and do not need generated energy is fed back to AC network, from AC network through the electric power of rectification unit input only in order to replenish inner power attenuation, bring the harmonic pollution problem thereby solved to electrical network.
Feature of the present invention also is there are three or many by the squirrel-cage asynchronism dynamometer motor of inverter power supply, every inverter all and be connected on the direct current bus-bar, dynamometer motor is connected to each other by the rotating part of shaft coupling and tested machinery.In automobile gear device, transfer gear test, just need a dynamometer machine to drag two dynamometer motor generatings sometimes, and two dynamometer machines drag a dynamometer motor generating as motor conversely as motor.
The present invention has following characteristics compared with the prior art:
1. the electric energy that sends of generator turns back to the input end of motor rather than is consumed, and has saved the energy greatly.The economy of energy of particularly saving in the long duration test of product is worth very considerable;
What 2. system adopted is simple in structure, firm squirrel cage asynchronous motor.High rotating speed, high precision and the high reliability of test macro is that direct current power-measuring system institute is incomparable;
3. the electric energy that sends of generator constitutes generator by inverter and circulates with the motor interior electric power, does not return AC network and do not need to return net arrangement by inversion.The harmonic pollution that this has just eliminated AC network has saved the equipment investment expense that the net arrangement costliness is returned in inversion.Reduce loss, improved system effectiveness.Simplify controlling unit, improved the reliability of equipment operation;
4. system can adopt the rectification unit of commercialization plain edition series, inverter to form, and very easily realizes high capacity, seriation, and cost is much relatively cheap.
The present invention is applicable to the measurement of power, torque, rotating speed, efficient and characteristic of plant equipment such as gear device, fluid torque-converter, transmission for vehicles, transfer gear and various types of vehicles gearing and the simulation test of duty.Be furnished with computer interface, can realize Automatic Control and detection.
Fig. 1 is a structural principle block diagram of the present invention.
Fig. 2 is the connection diagram that the present invention has three dynamometer motors.
Below in conjunction with accompanying drawing the present invention is elaborated.
The present invention includes inverter 2 and 3, squirrel-cage asynchronism dynamometer motor 4 as shown in Figure 1 With 5, frequency controller 6, shaft coupling 8 and 9, inverter 2 and squirrel-cage asynchronism dynamometer motor 4 link to each other, and inverter 3 links to each other with another squirrel-cage asynchronism dynamometer motor 5, two inverters 2 And being connected with frequency controller 6 between 3, dynamometer motor 4 and 5 is by shaft coupling 8 and 9 and quilt Test-run a machine tool rotating part 7 is connected to each other, and characterized by further comprising a rectification unit 1, rectification The input termination three-phase alternating current net of unit 1, output consists of direct current bus-bar, two inverters 2 and the 3 direct current bus-bars that insert in parallel. When the electricity envelope is worked with AC variable frequency asynchronous dynamometer system, Three phase network is through rectification unit 1, for inverter 2 and 3 provides dc source, and inverter 2 and 3 For dynamometer motor 4 and 5 provides the AC frequency conversion power supply, by frequency controller 6, increase a survey The frequency of merit motor 4 or when reducing the frequency of another dynamometer motor 5 can make dynamometer motor 4 do The motor operation, another dynamometer motor 5 supersynchronous speeds are made the generator load operating, and institute sends Alternating current return to inverter 2 by inverter 3, flow to again motor 4, so consist of The electric closed system of asynchronous generator and motor interior electrical power circulation, and do not need generating Energy feedback is given AC network, from AC network through the electrical power of rectification unit input only in order to replenish Inner power attenuation mainly comprises the resistance loss of rectification unit, inverter, dynamometer motor Copper loss, iron loss, machinery consumption etc., thus the harmonic pollution problem of bringing to electrical network solved, simultaneously Also save energy and returned the expensive expense of net arrangement.
Feature of the present invention is that also the squirrel-cage asynchronism dynamometer motor has three or many, such as accompanying drawing 2 Be depicted as three, wherein the squirrel-cage asynchronism dynamometer motor 4 and other two by inverter power supply Platform passes through shaft coupling by the squirrel-cage asynchronism dynamometer motor 5 and 10 of separately inverter power supply respectively 8,9 and 11 and the rotating part of tested machinery be connected to each other, when electrically enclosed AC variable frequency asynchronous Dynamometer system when work, increase by 4 frequency or reduce 5 and 10 frequency can make 4 do electronic The machine operation, 5 and 10 supersynchronous speeds are made the generator load operating, perhaps conversely, reduce 4 Frequency or increase by 5 and 10 frequency and can make 5 and 10 to make motor operation, 4 supersynchronous speed Degree is made the generator load operating, has so just consisted of a measurement of power motor and Duo Tai measurement of power generator Or the electric closed system of many measurement of power motor and a measurement of power generator electrical power circulation. In automobile gear device, the transfer gear test, sometimes just need two measurement of powers of a measurement of power motor run The generator generating, and conversely, measurement of power generator generating of two measurement of power motor runs.
Embodiment:
Adopt a 15KW rectification unit, provide direct supply to two 7.5KW inverters, inverter is output as two 7.5KW squirrel-cage asynchronism dynamometer motors the AC frequency conversion power supply is provided.Two dynamometer motors are by the coaxial connection of tested gear device.Start frequency controller the stator current frequency of measurement of power generator is slowly descended, the electric power of sending turns back to motor by inverter, forms the electric closed system of power circuit.
Claims (2)
1. electrically enclosed AC variable frequency asynchronous power-measuring system, include inverter 2 and 3, squirrel-cage asynchronism dynamometer motor 4 and 5, frequency controller 6, shaft coupling 8 and 9, inverter 2 links to each other with squirrel-cage asynchronism dynamometer motor 4, inverter 3 links to each other with squirrel-cage asynchronism dynamometer motor 5, be connected with frequency controller 6 between two inverters 2 and 3, dynamometer motor 4 and 5 by shaft coupling 8 and 9 and tested mechanical rotation part 7 be connected to each other, the invention is characterized in and also comprise a rectification unit 1, the input termination three-phase alternating current net of rectification unit 1, output terminal constitutes the direct current bus-bar, two inverters 2 and the 3 direct current bus-bars that insert in parallel.
2. a kind of electrically enclosed AC dynamometer system according to claim 1, it is characterized in that the squirrel-cage asynchronism dynamometer motor has three or many, wherein one by the squirrel-cage asynchronism dynamometer motor 4 of inverter power supply and other two respectively by the squirrel-cage asynchronism dynamometer motor 5 and 10 of separately inverter power supply, dynamometer motor 4,5,10 is connected to each other by the rotating part of shaft coupling 8,9,11 and tested machinery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98112319 CN1110694C (en) | 1998-01-20 | 1998-01-20 | Electrically enclosed AC variable frequency asynchronous dynamometering machine system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98112319 CN1110694C (en) | 1998-01-20 | 1998-01-20 | Electrically enclosed AC variable frequency asynchronous dynamometering machine system |
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| Publication Number | Publication Date |
|---|---|
| CN1224153A true CN1224153A (en) | 1999-07-28 |
| CN1110694C CN1110694C (en) | 2003-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98112319 Expired - Fee Related CN1110694C (en) | 1998-01-20 | 1998-01-20 | Electrically enclosed AC variable frequency asynchronous dynamometering machine system |
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| CN (1) | CN1110694C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102401712A (en) * | 2011-09-29 | 2012-04-04 | 武汉华中数控股份有限公司 | Loading device of electric dynamometer |
| CN102494820A (en) * | 2011-12-28 | 2012-06-13 | 北京市三一重机有限公司 | Electric dynamometer |
| CN103900749A (en) * | 2014-03-05 | 2014-07-02 | 北京欧润特科技有限公司 | Energy-saving type chassis dynamometer |
-
1998
- 1998-01-20 CN CN 98112319 patent/CN1110694C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102401712A (en) * | 2011-09-29 | 2012-04-04 | 武汉华中数控股份有限公司 | Loading device of electric dynamometer |
| CN102494820A (en) * | 2011-12-28 | 2012-06-13 | 北京市三一重机有限公司 | Electric dynamometer |
| WO2013097374A1 (en) * | 2011-12-28 | 2013-07-04 | 湖南三一智能控制设备有限公司 | Electric dynamometer |
| CN102494820B (en) * | 2011-12-28 | 2014-07-23 | 北京市三一重机有限公司 | Electric dynamometer |
| CN103900749A (en) * | 2014-03-05 | 2014-07-02 | 北京欧润特科技有限公司 | Energy-saving type chassis dynamometer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1110694C (en) | 2003-06-04 |
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