CN2367016Y - Arrangement for regulating speed of ac motor - Google Patents
Arrangement for regulating speed of ac motor Download PDFInfo
- Publication number
- CN2367016Y CN2367016Y CN 99228061 CN99228061U CN2367016Y CN 2367016 Y CN2367016 Y CN 2367016Y CN 99228061 CN99228061 CN 99228061 CN 99228061 U CN99228061 U CN 99228061U CN 2367016 Y CN2367016 Y CN 2367016Y
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- speed
- motor
- stator
- electric motor
- floatation electric
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Abstract
The utility model relates to a device for regulating a speed of an AC motor. A rotary speed of a prime mover and a load speed are connected in a floating mode through a feed motor. The carrying capacity is used for impelling the feed motor to generate electricity. The stepless speed regulation of the following simultaneous constant turning moment of the whole device is implemented. If the feed motor works under an electric condition, an output rotary speed is superposed based on the speed which is higher than the rotary speed of an original motor. The stepless speed change of the oversynchronous constant turning moment is implemented. The utility model has the advantages of wide range of the speed regulation, high efficiency of the speed regulation and high power factor. A slip power can be fed back to an electric network on a slow running occasion. Therefore, the utility model has the advantage of favorable low-speed characteristic.
Description
The utility model relates to the speed governing of alternating current machine, particularly to the stepless speed regulation of cage-type rotor asynchronous motor.
Alternating current machine normally produces rotating magnetic field with alternating current and drives the output of rotor rotation acquisition machinery in stator coil, because the fixed-frequency of alternating current.Therefore, the speed governing of alternating current machine becomes a difficult problem.At present, comparatively complicated to the stepless speed regulation mode of asynchronous machine, it is generally acknowledged that easier mode is, realize speed governing by the voltage of regulating stator winding, its shortcoming is that speed efficiency is low, and power factor is low, and loss is big during low speed, heating is serious, influences electrical machinery life, so economy is bad.Another kind is frequency control, and the method that adopt to change the power supply frequency realizes, its shortcoming be supersynchronous during with low cruise torque descend, and must be furnished with special-purpose variable frequency power supply, its user that costs an arm and a leg is difficult for accepting.With the utility model contrast have two kinds in the mode of speed regulation of using, a kind of is the electromagnetic slip clutches speed regulating device, claim slip electric motor again, it is that cage electromotor is rotated with the armature that constant speed drives electromagnetic clutch as prime mover, realize to its magnetic pole being the adjusting of the rotating speed of driven rotor by control to the electromagnetic clutch exciting current, the shortcoming of this kind speed governing is turned speed and can only be regulated in the following scope of the rotating speed of prime mover, and the low cruise loss is big, efficient lower (efficient only is 80-85% during high speed).Another kind of be tandem control, promptly in wire wound asynchronous motor rotor loop, seal in the additional electromotive force with the rotor electromotive force same frequency,, realize the adjusting of motor speed by changing the amplitude size and the phase place of additional electromotive force.The shortcoming of this kind speed governing is that alignment circuit is comparatively complicated, rectifier need be arranged, contravariant transformer etc.
For overcoming above deficiency, the speed regulating device that the utility model provides are according to mechanics principle and law of conservation of energy, utilize the invertibity of the electromechanical energy conversion of motor, the rotating speed of alternating current machine is separated, realize that alternating current machine electric energy feedback reaches the effect of control rotating speed.
The utility model device adds peripheral unit by at least two known motors and constitutes, in two motors, a suspension, one fixing, the stator casing of floatation electric motor is provided with axial output shaft, and the stator casing of floatation electric motor is supported by bearing, bearing is fixed in ground again with after support connects, the stator casing of floatation electric motor or armature spindle the two one of with the armature spindle driving coupling of fixed electrical machinery, the stator coil of floatation electric motor links to each other with electrical network by conducting slip ring, and the stator of fixed electrical machinery also is connected on the electrical network.The armature spindle of floatation electric motor or stator axis also can with the stator casing of another floatation electric motor or armature spindle the two one of driving coupling, and can and the like series connection, form multistep speed regulation, the stator coil of the multistage floatation electric motor that is connected in series all links to each other with electrical network by conducting slip ring.Also be provided with inverter on the stator coil of floatation electric motor or the stator coil of fixed electrical machinery and the circuit that electrical network is connected.Floatation electric motor can be permanent magnet synchronous motor, and fixed electrical machinery can be asynchronous machine, between the stator conducting ring terminal of magneto and electrical network inverter is set.
Below in conjunction with drawings and Examples principle of the present utility model and structure are described further.
Fig. 1 is the utility model speed regulating device schematic diagrames;
Fig. 2 is a kind of structure of floatation electric motor among Fig. 1;
Fig. 3 is the another kind of structure of the utility model speed regulating device.
Referring to Fig. 1, the utility model speed regulating device add peripheral unit by two motors and constitute, and A is a fixed electrical machinery, selects squirrel cage induction motor for use, and its stator coil links to each other with electrical network.B is a floatation electric motor, select permagnetic synchronous motor for use, the stator case of floatation electric motor is supported by bearing, can rotate around axis, its stator line links to each other with electrical network by conducting slip ring, armature spindle 15 driving coupling of the stator end cap of floatation electric motor B and motor A, (directly transmission or gear indirect drive), therefore when the rotor of motor A rotated, the stator that can drive motor B was around coaxial rotation.C is the inverter that is connected between motor and the electrical network, and 3 is the floatation electric motor rotor of output shaft axle.
Fig. 2 is a kind of enforcement structure of floatation electric motor among Fig. 1, and motor is supported on bearing 2 and 13 by the drive sleeve 12 that combines as a whole with stator end cap 5, and bearing 2 and 13 is fixed on the shell front and rear cover 4, and end cap 4 is fixed in ground after combining as a whole with tube-like envelope 6.3 is rotor axis of electric, is supported on bearing 1 and 14.10 is stator line bag, and 11 is rotor, and 9 is stator casing, and 7 is three conducting slip rings, is communicated with the back with 8 contacts of three brushes and is connected with electrical network.
Fig. 3 is the another kind of driving coupling structure of the utility model floatation electric motor and fixed electrical machinery.The armature spindle 15 of fixed electrical machinery A and the armature spindle 3 usefulness couplings 17 rigidity interlinks of floatation electric motor B when motor A rotor rotates, can drive the armature spindle 3 coaxial rotations of motor B, and 16 for being located at the axial output shaft on the floatation electric motor B stator casing end cap.
Speed control principle and embodiment:
Embodiment 1: as Fig. 1, after the asynchronous motor energized, begin rotation, the stator that drives synchronous motor simultaneously rotates, at this moment the rotor of synchronous motor still is in halted state under the situation of no external magnetic field, owing to adopt the effect in the magnetic field of magnet rotor, stator produces induced potential with the magnetic field of cutting rotor, and synchronous motor has just entered generating state, has formed a generator.After generator is connected load, will produce induced current, this electric current produces magnetic field force again, and the drive p-m rotor rotates.The size of control load electric current has just been controlled the rotating speed of exporting, and at this moment the driving rotating speed of the rotating speed of motor and generator is poor, is exactly the mechanical load rotating speed.Speed adjustable range is between 0-N1, and N1 is fixed electrical machinery (prime mover) rotating speed.Poor in order to obtain stable rotating speed, and the energy of generator is fully used, and having added an inverter, the voltage of stabilized power supply has just been stablized output speed, with the whole feedback grids of slip power, realized low-speed high-efficiency, the energy-saving run of this device simultaneously.This device is in running, and motor is in optimal operational condition all the time, and synchronous machine also has the effect of compensation power factor, so power factor (PF) is also high.This device has adopted the rotating speed separation, with simply adding, subtracts method and just can obtain different rotating speeds.
Embodiment 2: as Fig. 1, asynchronous motor drives the synchronous motor stator rotation, and with synchronous motor stator feeding DC power supply, produce a fixed magnetic field, because the mutual sucking action device output speed of synchronous motor stator field and p-m rotor is the rotating speed of asynchronous motor.
Embodiment 3: as Fig. 1, turn round in the same way behind the power supply of phase sequence if in the stator of synchronous motor, feed with asynchronous motor, the rotating speed that synchronous motor begins with asynchronous motor serves as that base speed is to this running in the same way more than rotating speed, the rotating speed of this device will be the rotating speed sum of synchronous motor and asynchronous motor, the incoming frequency of regulating synchronous machine just can be regulated the rotating speed of this device, and whole device begins to do supersynchronous operation.The speed adjustable range upper limit can reach N1+N2.
Embodiment 4: as Fig. 3, the fixed electrical machinery rotor of output shaft axle directly is connected with the floatation electric motor armature spindle, and the axle that links with the suspension stator is 16 as driven shaft.Identical with embodiment 1 principle, begin rotation after the asynchronous motor energized, the magnet rotor that drives synchronous motor simultaneously rotates, because the action of a magnetic field of p-m rotor, stator produces induced potential with the magnetic field of cutting rotor, and synchronous motor has entered generating state.After generator is connected load, will produce induced current, this electric current produces magnetic field force again, and drives stator and rotated and adopt, and the size of control load electric current has just been controlled the torque that motor is exported.Can reach embodiment 1,2 too with this connected mode, 3 speed governing effect.
Embodiment 5: adopt above structure to realize the high-speed cruising of this device, can adopt the multipolar dynamo mechanical connection manner, every grade of motor all the preceding stage rotating speed as the one-level rotating speed of base speed to adjusted self.Every grade of motor directly drops into electrical network, and operation in the same way, and does not need inverter, also can realize the high-speed cruising of this device.As: the rated speed of three grades of motors is respectively N1, N2, N3.Zhuan Zhi specified output speed is exactly N=N1+N2+N3 so, so, has just realized high-speed cruising at an easy rate.If wish to obtain higher rotating speed, the connection progression that only needs to increase motor gets final product.
Embodiment 6: adopt embodiment 1,2 mode also can realize the step speed change operation of this device, as two rotating speed of motor is that N1, N2 (establish: N1＞N2), can utilize the method for positive reversal connection motor steering to obtain N1, N1-N2, four kinds of speed of N2, N1+N2 after adopting above structure to connect, wherein: N1-N2 represents that N1 is opposite with the N2 direction of rotation, output speed is the poor of two motor speeds, and N1+N2 represents that N1 is identical with the N2 direction of rotation, and output speed is two motor speed sums.Increase the connection progression of motor as required, can also obtain more rotating speed level.Present embodiment need not inverter.
Floatation electric motor in this device and fixed electrical machinery do not have clearly regulation on running status, floatation electric motor can be used as speed governing, also can be used as prime mover, fixed electrical machinery also can be used as prime mover, also can be used as speed governing uses, speed governing effect in the above-described embodiments all can reach, but inverter preferably is connected between the motor and electrical network that is used for speed governing.When floatation electric motor is used as speed governing, also available other motive force substitutes of fixed electrical machinery, as petrol engine, Diesel engine etc.If asynchronous motor is connect AC power, the motor output end that suspends synchronously inserts adjustable resistance, at this moment similar known wound motor rotor series resistance speed; When if floatation electric motor is done speed governing synchronously, also available electromagnetic clutch field coil is introduced p-m rotor as the generator output winding, the generating state of similar electromagnetic clutch speed governing this moment.
The utility model connects with load speed the rotating speed of prime mover with the mode of floating by a feed motor, promote the generating of feed motor with load force, realize the following synchronously constant-torque stepless speed-regulating of whole device, as with the feed machine operation in motoring condition, then output speed is the superposition more than former motor speed, realizes hypersynchronous permanent torque infinitely variable speeds.The utility model has the advantages that to have speed-regulating range width, the speed efficiency height, the power factor height, during low cruise, slip power is feedback grid all, so low-speed characteristic is good, utilizes known original motor structure, and the cost of device is also just lower.
Claims (4)
1. speed regualtion of AC motor device, it is characterized in that adding peripheral unit by at least two known motors constitutes, in two motors, a suspension, one fixing, the stator casing of floatation electric motor is provided with axial output shaft, and the stator casing of floatation electric motor is supported by bearing, bearing is fixed in ground again with after support connects, the stator casing of floatation electric motor or armature spindle the two one of with the armature spindle driving coupling of fixed electrical machinery, the stator coil of floatation electric motor links to each other with electrical network by conducting slip ring, and the stator of fixed electrical machinery also is connected on the electrical network.
2, speed regualtion of AC motor device according to claim 1, it is characterized in that the armature spindle of floatation electric motor or stator axis also can with the stator casing of another floatation electric motor or armature spindle the two one of driving coupling, and can and the like series connection, form multistep speed regulation, the stator coil of the multistage floatation electric motor that is connected in series all links to each other with electrical network by conducting slip ring.
3. also be provided with inverter on the speed regualtion of AC motor device according to claim 1 and 2, the stator coil that it is characterized in that the stator coil of floatation electric motor or fixed electrical machinery and the circuit that electrical network is connected.
4. speed regualtion of AC motor device according to claim 3 is characterized in that floatation electric motor is a permanent magnet synchronous motor, and fixed electrical machinery is the programme of cage asynchronous motor, between the stator conducting ring terminal of magneto and electrical network inverter is set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99228061 CN2367016Y (en) | 1999-04-23 | 1999-04-23 | Arrangement for regulating speed of ac motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99228061 CN2367016Y (en) | 1999-04-23 | 1999-04-23 | Arrangement for regulating speed of ac motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2367016Y true CN2367016Y (en) | 2000-03-01 |
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ID=34017499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99228061 Expired - Fee Related CN2367016Y (en) | 1999-04-23 | 1999-04-23 | Arrangement for regulating speed of ac motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2367016Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103264320A (en) * | 2013-04-10 | 2013-08-28 | 南京航空航天大学 | Method and device for realizing large current and high rotation speed electric conduction |
| CN108306455A (en) * | 2018-02-06 | 2018-07-20 | 广东力源工程技术有限公司 | A kind of electric device and its starting method for dragging large inertia load |
-
1999
- 1999-04-23 CN CN 99228061 patent/CN2367016Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103264320A (en) * | 2013-04-10 | 2013-08-28 | 南京航空航天大学 | Method and device for realizing large current and high rotation speed electric conduction |
| CN103264320B (en) * | 2013-04-10 | 2016-04-27 | 南京航空航天大学 | A kind of method and device thereof realizing big current height rotating speed conduction |
| CN108306455A (en) * | 2018-02-06 | 2018-07-20 | 广东力源工程技术有限公司 | A kind of electric device and its starting method for dragging large inertia load |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |