CN104993628A - Speed regulation method of three-phase AC adjustable-speed motor of rotor power frequency AC excitation - Google Patents
Speed regulation method of three-phase AC adjustable-speed motor of rotor power frequency AC excitation Download PDFInfo
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- CN104993628A CN104993628A CN201510350387.8A CN201510350387A CN104993628A CN 104993628 A CN104993628 A CN 104993628A CN 201510350387 A CN201510350387 A CN 201510350387A CN 104993628 A CN104993628 A CN 104993628A
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Abstract
The invention provides a speed regulation method of a three-phase AC adjustable-speed motor of rotor power frequency AC excitation. The speed regulation method comprises a stator, a coil wound rotor with a commutator, a stator three-phase voltage regulator connected with the stator, a rotor three-phase voltage regulator connected with a winding rotor, three-phase electric brushes installed on a rotary electric brush rack, and an electric brush rack drive. The speed regulation method of the adjustable-speed motor comprises the following steps: the coil wound rotor with the commutator adopts a winding method of an DC rotor winding, and the winding is connected to the commutator; the coil wound rotor with the commutator is connected to an output end of the rotor three-phase voltage regulator through the rotor commutator and the three-phase electric brushes, and the power frequency three-phase AC excitation is provided for the winding rotor; the three-phase electric brushes are uniformly distributed and installed on the rotary electric brush rack at equal-angle intervals, and contact the rotor commutator; and inclined angles between the three-phase electric brushes and the stator winding are adjusted. Large-torque speed regulation within a large speed regulation scope is achieved, the structure is simple, and cost is low.
Description
Technical field
The present invention relates to motor technology field, particularly relate to a kind of speed regulating method of three-phase AC speed-regulating motor of rotor industrial frequency AC excitation.
Background technology
In more than 200 year historical process in the past, electromagnetic elder generation have invented direct current, three-phase alternating current, have invented DC motor and alternating current motor, synchronous motor, asynchronous motor, servomotor etc.But the speed governing of motor plays a part very important in world today's industrial production and daily life.The speed regulating method of DC motor:
change excitation resistance;
change armature voltage;
change armature resistance.The most frequently used in these methods is change armature voltage speed governing, because it is not when affecting motor breakdown torque, motor can be made to obtain broad speed adjustable range.The speed adjusting performance of direct current machine is very good, but compared with current widely used alternating current machine, direct current machine needs a set of powerful DC power supply, and alternating current machine does not then need; The brush-system of direct current machine belongs to mechanical friction, needs often to safeguard (changing brush, cleaning commutator), and alternating current machine does not then have these; The spark of carbon brush can cause electromagnetic interference to a large amount of electronic system used; Volume ratio alternating current machine with the direct current machine of power is large; Present AC converter is very ripe, can meet most speed governing requirement.
It is all depend on the principle that three-phase electricity alternately forms rotating magnetic field to carry out work that current alternating current motor comprises threephase asynchronous and synchronous motor.Wherein threephase asynchronous is by rotor slippage Absorption Current excitation and acting.The rotor of threephase asynchronous has two kinds of forms: squirrel-cage and Wound-rotor type.The rotor windings of wire wound asynchronous motor is similar to stator winding.It is embedding with in rotor with insulated conductor, and the winding number of phases and number of pole-pairs are all equal with stator winding, and wherein three leading-out terminals are connected on three slip rings of one end of rotating shaft, then by the brush that three slip ring sliding contacts are static, is connected with external circuit.
The speed regulating method of induction motor:
pole changing: be generally based on two speed changes the connection in series-parallel relational implementation of motor winding by the switching over of outside.This multiple-speed motor is mostly cage-type rotor motor, and its structure is similar to basic system asynchronous motor;
change supply power voltage speed governing: change a kind of speed regulating method that the speed governing of stator supply power voltage is asynchronous machine, after stator supply power voltage reduces, rotor slippage increases, and realizes reducing rotating speed object, but mechanical properties;
change rotor resistance speed governing: wire wound asynchronous motor can access additional resistance by slip ring and brush in rotor windings loop, start and speed adjusting performance in order to improve;
rotor tandem control: introduce the method that additional potential carries out speed governing in wound rotor loop, be called the tandem control of wire wound asynchronous motor, the superiority of rotor crosstalk gesture to reclaim slip power, comprises low synchronous tandem control and supersynchronous tandem control two kinds of situations.The total power factor of Cascade Speed Regulation Systems is low, and the high order harmonic component of generation has pollution to electrical network;
frequency control: frequency control utilizes the synchronous speed of asynchronous motor with the characteristic of frequency change, by the mode of speed regulation that the power supply changing motor realizes frequently, frequency control belongs to the speed governing changing power parameter, is both applicable to synchronous motor, and is also applicable to asynchronous motor;
chopped Mode Feedback speed governing: on the stator of asynchronous machine, addition of in insulating mutually with primary winding and present winding (also known as regulating winding), be used for accepting the electric slip power that rotor shifts out, interior feedback winding is under the effect of rotating magnetic field, generation frequency is the induced potential E3 of f1, constant amplitude, convertor assembly makes interior feedback winding be operated in generating state, accepted electric slip power is passed through electromagnetic induction again, be transferred to stator primary winding in the other direction, the input power of stator is reduced, balance each other with mechanical output, realize stepless speed regulation;
brushless dual-feed motor: brushless dual-feed motor only has a stator, a cage rotor, a set of common magnetic circuit after improving, have the winding of the different number of pole-pairs of two covers in stator, one group claims power winding, connects three phase network, another group claims controlled winding, connects converter plant.When two kinds of winding numbers of pole-pairs are determined, the stepless speed regulation of motor can be realized by the output frequency changing controlled winding frequency converter;
rotor operated type three-phase shunt excitation alternating-current commutator motor: this motor is equipped with double winding in the rotor of band commutator, and one is the three-phase alternating current winding of being drawn by slip ring and brush, and it is by three-phase alternating current electrical network feed, as former limit; Another is the commutator winding of being drawn by the brush on commutator, it is connected into closed-loop path respectively by brush and stator winding, form the secondary of motor, the open-angle of brush is adjustable, three pairs of brushes can also circumferentially move to required optional position simultaneously, and because this motor adopts rotor feed type, whole electric energy of whole motor enter from rotor limit through brush and slip ring entirely, therefore voltage can not be too high, generally within 500V.
Existing various speed regulating method, respectively has pluses and minuses:
1, pole changing only has 2-3 kind fixed rotating speed, can not stepless speed regulation;
2, change supply power voltage speed governing, belong to slip regulating speed, mechanical properties;
3, change rotor resistance speed governing, be used for improving startability, mechanical properties;
4, rotor tandem control, adopts thyristor or frequency converter, has harmonic pollution;
5, frequency control, has harmonic pollution, and the larger cost of power is higher;
6, Chopped Mode Feedback speed governing, has harmonic pollution;
7, brushless dual-feed motor, has harmonic pollution;
8, rotor operated type three-phase shunt excitation alternating-current commutator motor, voltage is limited, capacity constraint.
Summary of the invention
The technical problem to be solved in the present invention is, a kind of speed regulating method of three-phase AC speed-regulating motor of rotor industrial frequency AC excitation is provided, this speed-regulating control device is three-phase regulator, structure is simple, cost is low, do not produce high order harmonic component, there is the governor control characteristics of DC motor low speed high torque, the wide feature of adjustment of rotational speed scope.
The technical scheme adopted is:
A speed regulating method for the three-phase AC speed-regulating motor of rotor industrial frequency AC excitation, this adjustable-speed motor comprises stator, the wound rotor with commutator, the stator three-phase regulator be connected with stator, the rotor three-phase voltage regulator be connected with wound rotor, is contained in three-phase electricity brush on electric rotating brush holder and brush carrier driver.The speed regulating method of this adjustable-speed motor comprises the following steps:
One, with the wound rotor of commutator, adopt the method for winding of DC rotor winding, winding is connected on commutator, and the method for attachment of DC rotor winding and phase changer comprises lap winding, wave winding and all can be used; The pass of winding coil span groove number and rotor core groove number is: coil spread groove number (L)=rotor core groove number (M)/three-phase electricity brush number (D), wherein three-phase electricity brush number (D)=rotor magnetic pole number (N) * 3/2.Rotor core groove number (M) should be kept for the integral multiple of three-phase electricity brush number (D), if coil spread groove number (L) obtains non-integer, then round downwards;
Two, by the wound rotor with commutator by being connected on the output of rotor three-phase voltage regulator outside rotor commutator and three-phase electricity brush, power frequency three-phase alternating current excitation is provided to wound rotor, by the phase sequence of adjustment three-phase electricity brush, make rotor-exciting magnetic field rotation direction identical with stator field direction of rotation, excitation field rotates on rotor, excitation field rotating speed and rotor speed have nothing to do, only relevant with supply frequency with wound rotor number of pole-pairs, wound rotor excitation field rotating speed computational methods are identical with stator field rotating speed computational methods;
Three, make three-phase electricity brush equiangularly interval, be uniformly distributed and be arranged on electric rotating brush holder, contact with rotor commutator; Be 3 when brush quantity and between brush during 120 °, interval, rotor form 2 grades of rotating magnetic fields; When brush quantity is 6 and 60 °, interval distribution between brush, when homophase brush is in parallel, form 4 grades of rotating magnetic fields at rotor; Two brushes not homophase that each brush is adjacent with front and back;
Four, the three-phase electricity brush that rotor axle rotates is adjusted, the angle between adjustment three-phase electricity brush and stator winding, and then the phase place angle between adjustment rotor-exciting magnetic field and stator field;
Five, adjust the phase place angle between three-phase electricity brush and stator winding, rotor-exciting magnetic field can be made to overlap completely with the phase place of stator field, the locking phase that the polarity reaching rotor magnetic pole and magnetic pole of the stator is attracted each other;
Time above-mentioned rotor-exciting magnetic field and stator field are in locking phase, rotor-exciting produces reactive power, and along with the increase of rotor excited voltage, stator reactive power reduces, and power factor improves; Along with the further raising of rotor excited voltage, stator power factor reaches 1, then can proceed to capacitive state, to electrical network feedback reactive power.
The above-mentioned phase place angle passed through between adjustment three-phase brush and stator winding, makes rotor-exciting magnetic field fall to lagging behind in a rotational direction stator field certain angle, and along with the increase of rotor excited voltage, the power output of motor increases; When load is constant, rotor speed rises; During underloading, supersynchronous rotating speed can be obtained.
The above-mentioned phase place angle passed through between adjustment three-phase brush and stator winding, when making rotor-exciting magnetic field fall to being ahead of in a rotational direction stator field certain angle, along with the increase of rotor excited voltage, motor speed reduces, until stop.
Feature of the present invention is:
1, the problem that AC motor rotor can not adopt industrial-frequency alternating current excitation is solved,
2, speed-regulating control device is three-phase regulator, and structure is simple, and cost is low, without the need to power electric component, does not produce high order harmonic component;
3, there is the governor control characteristics of DC motor low speed high torque; Adjustment of rotational speed scope is wide, operation is level and smooth, overload is started and brake torque is large, and can be suitable for Fraquent start, braking, can maintain rotating speed constant when load sharply changes;
4, there is the characteristic of synchronous motor, the power factor of stator can be adjusted by rotor-exciting;
5, have the characteristic of wound rotor tandem control, rotor speed can exceed synchronous speed;
6, speed adjustable range is broad, in speed adjustable range, any rotating speed can adjust power output.Both can constant-power speed regulation, also can speed regulation by constant torque; Both can run by low speed high torque, also can the little torque of low speed run.
7, be applicable to the frequent fluctuation of load, when the fluctuation of load, rotating speed changes automatically, when load increases suddenly, automatically enters low speed high torque and exports, when load reduction, automatically improve rotating speed.
8, stators and rotators can both input active power, improves the power density of motor.
9, motor of the present invention is to rotor speed to stator voltage sensitive, and rotor speed excursion is large.When reducing stator supply power voltage, rotor speed declines, and carries out three-phase alternating current power frequency excitation simultaneously, rotor torque will be made to increase, realize the large torque speed governing in large speed adjustable range to rotor.
Accompanying drawing explanation
Fig. 1 is that stators and rotators of the present invention and power frequency thereof are powered pressure and speed regulating system schematic diagram.
Fig. 2 is rotor of the present invention and power supply voltage-regulating system schematic diagram thereof.
Fig. 3 is that stator field of the present invention turns to identical with rotor-exciting magnetic field, phrase overlap schematic diagram.
Fig. 4 is that rotor-exciting magnetic field of the present invention turns to identical with stator field, and rotor-exciting magnetic phase falls behind schematic diagram.
Embodiment
A speed regulating method for the three-phase AC speed-regulating motor of rotor industrial frequency AC excitation, this example is the motor of two poles for stator, stator connecting stator three-phase regulator.Comprise motor casing, cooling system, electric machine controller, stator 1, the wound rotor 2 with commutator, three-phase electricity brush 3, rotatable brush carrier 5, brush carrier drive unit 6, stator three-phase regulator 7, rotor three-phase voltage regulator 8.Described stator 1 connects stator three-phase regulator 7.Described three-phase electricity brush 3 is with 120 ° of angularly intervals, be uniformly distributed and be arranged on rotatable brush carrier 5, with rotor commutator 4 reliable contacts, rotatable brush carrier 5 and rotor coaxial, with fluted disc, pinion on brush carrier drive unit 6 servo-driver can drive rotatable brush carrier 5 rotor axle to rotate, the angle between adjustment three-phase electricity brush and stator winding, and then the phase place angle between adjustment rotor-exciting magnetic field and stator field.By the phase place angle between adjustment three-phase electricity brush and stator winding, make the phase coincidence of rotor-exciting magnetic field and stator field, enter locking phase.Three-phase electricity brush 3 is connected with rotor three-phase voltage regulator 8 by cable, and rotor three-phase voltage regulator 8 connects power frequency three-phase alternating-current powered circuit, and rotor three-phase voltage regulator 8 provides power frequency three-phase alternating current by three-phase electricity brush 3 and rotor commutator 4 pairs of wound rotors 2.By the phase sequence that adjustment three-phase electricity brush is connected with three-phase regulator, make rotor-exciting magnetic field rotation direction identical with stator field direction of rotation.Described stator is three-phase alternating current stator, identical with common threephase asynchronous stator, produces rotating magnetic field by three-phase alternating current, drives wound rotor to rotate acting.The described wound rotor with commutator, identical with direct current wound rotor structure, winding is short-circuited winding, and one end is with commutator, and the method for attachment of rotor windings and commutation sheet adopts lap winding.When supply frequency is 50Hz, the rotary speed of stator field 9 is 3000 revs/min.Three brushes produce the rotor-exciting magnetic field 10 of 50Hz on rotor at the three-phase alternating current of access, the rotating speed in rotor-exciting magnetic field 10 is constant rotational speed, identical with stator field 9 rotating speed, have nothing to do with rotor speed.
When rotor-exciting magnetic field 10 is in locking phase with stator field 9 time, the whole of rotor-exciting generation are reactive power, and along with the increase of rotor excited voltage, stator reactive power reduces, and power factor improves.Along with the further raising of rotor excited voltage, stator power factor reaches 1, then can proceed to capacitive state, to electrical network feedback reactive power.
When rotor-exciting magnetic field 10 falls to suitably lagging behind in a rotational direction stator field 9 certain angle time, along with the increase of rotor excited voltage, the power output of motor increases.When load is constant, rotor speed rises; During underloading, supersynchronous rotating speed can be obtained.
Motor of the present invention is to rotor speed to stator voltage sensitive, and rotor speed excursion is large.When reducing stator supply power voltage, rotor speed declines, and carries out three-phase alternating current power frequency excitation simultaneously, rotor torque will be made to increase, realize the large torque speed governing in large speed adjustable range to rotor.
Claims (4)
1. the three-phase AC speed-regulating electric motor speed adjusting method of a rotor industrial frequency AC excitation, this adjustable-speed motor comprises stator (1), the wound rotor (2) with commutator (4), the stator three-phase regulator (7) be connected with stator, the rotor three-phase voltage regulator (8) be connected with wound rotor, is contained in three-phase electricity brush (3) on electric rotating brush holder (5) and brush carrier driver (6), it is characterized in that the speed regulating method of this adjustable-speed motor comprises the following steps:
1), with the wound rotor (2) of commutator, adopt the preparation method of DC rotor, rotor windings is connected on commutator (4), and the method for attachment of rotor windings and phase changer (4) comprises lap winding, wave winding or frog winding; The pass of winding coil span groove number and rotor core groove number is: coil spread groove number (L)=rotor core groove number (M)/three-phase electricity brush number (D), wherein three-phase electricity brush number (D)=rotor magnetic pole number (N) × 3/2; Rotor core groove number (M) should be kept for the integral multiple of three-phase electricity brush number (D), if coil spread groove number (L) obtains non-integer, then round downwards;
2), by the wound rotor (2) with commutator (4) by being connected on the output of rotor three-phase voltage regulator outside commutator (4) and three-phase electricity brush (3), power frequency three-phase alternating current excitation is provided to wound rotor (2), by the phase sequence of adjustment three-phase electricity brush (3), make rotor-exciting magnetic field (10) direction of rotation identical with stator field (9) direction of rotation, excitation field is in the upper rotation of wound rotor (2), and excitation field rotating speed is only relevant with supply frequency with wound rotor number of pole-pairs;
3), make three-phase electricity brush (3) equiangularly interval, be uniformly distributed and be arranged on electric rotating brush holder (5), contact with commutator (4); When brush quantity is 3, and between brush during 120 °, interval, in the upper formation 2 grades of rotating magnetic fields of wound rotor (2); When brush quantity is 6, and 60 °, interval distribution between brush, when homophase brush is in parallel, form 4 grades of rotating magnetic fields at wound rotor (2); Two brushes not homophase that each brush is adjacent with front and back;
4), the electric rotating brush holder (5) that rotates of adjustment rotor axle, the angle between adjustment three-phase electricity brush (3) and stator winding, and then the phase place angle between adjustment rotor-exciting magnetic field (10) and stator field (9);
5) the phase place angle, between adjustment three-phase electricity brush and stator winding, makes rotor-exciting magnetic field (10) reach with stator field (9) locking phase that rotor magnetic pole is attracted each other with the polarity of magnetic pole of the stator, phase place overlaps completely.
2. the three-phase AC speed-regulating electric motor speed adjusting method of a kind of rotor industrial frequency AC excitation according to claim 1, when it is characterized in that described rotor-exciting magnetic field (10) and stator field (9) are in locking phase, rotor-exciting produces reactive power, along with the increase of rotor excited voltage, stator reactive power reduces, and power factor improves; Along with the further raising of rotor excited voltage, stator power factor reaches 1, then can proceed to capacitive state, to electrical network feedback reactive power.
3. the three-phase AC speed-regulating electric motor speed adjusting method of a kind of rotor industrial frequency AC excitation according to claim 1, it is characterized in that the described phase place angle passed through between adjustment three-phase brush and stator winding, rotor-exciting magnetic field is made to fall to lagging behind in a rotational direction stator field certain angle, along with the increase of rotor excited voltage, the power output of motor increases; When load is constant, rotor speed rises; During underloading, supersynchronous rotating speed can be obtained.
4. the three-phase AC speed-regulating electric motor speed adjusting method of a kind of rotor industrial frequency AC excitation according to claim 1, it is characterized in that the described phase place angle of working as by adjusting between three-phase brush and stator winding, when making rotor-exciting magnetic field fall to being ahead of in a rotational direction stator field certain angle, along with the increase of rotor excited voltage, motor speed reduces, until stop.
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| CN201510350387.8A CN104993628B (en) | 2015-06-24 | 2015-06-24 | A kind of speed regulating method of the three-phase AC speed-regulating motor of rotor industrial frequency AC excitation |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110417306A (en) * | 2018-04-28 | 2019-11-05 | 钱罗奋 | Double one keys of characteristic of the strong tractive force motor series excitation synchronously control of electric vehicle drive method |
| CN113131491A (en) * | 2021-04-25 | 2021-07-16 | 哈尔滨理工大学 | Reactive power regulation method and device for phase modulator rotor in static state |
| TWI750052B (en) * | 2021-03-05 | 2021-12-11 | 中華汽車工業股份有限公司 | Switching motor drive control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113131491B (en) * | 2021-04-25 | 2022-08-30 | 哈尔滨理工大学 | Reactive power regulation method and device for phase modulator rotor in static state |
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