CN103065763B - A kind of magnet charger based on flywheel energy storage - Google Patents
A kind of magnet charger based on flywheel energy storage Download PDFInfo
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- CN103065763B CN103065763B CN201310015259.9A CN201310015259A CN103065763B CN 103065763 B CN103065763 B CN 103065763B CN 201310015259 A CN201310015259 A CN 201310015259A CN 103065763 B CN103065763 B CN 103065763B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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Abstract
The invention discloses a kind of magnet charger based on flywheel energy storage, comprise energy-storage units and the unit that magnetizes; Energy-storage units adopts energy accumulation device for fly wheel, and it comprises rectifier, current transformer, controller, electric motor units and flywheel mechanism.The present invention by Flywheel energy storage technique together with magnet charger combine with technique, using energy accumulation device for fly wheel as highpowerpulse discharge power supply, in order to magnetize, unit provides energy, and when having given full play to flywheel as energy-storage travelling wave tube, high power density, long-life, the distinguishing feature such as do not pollute the environment; Traditional capacitive magnetizing apparatus is compared, and discharge and recharge is often, long service life, cost be also lower, and the discharge and recharge time is short, more efficiently, and the requirement of more realistic production.
Description
Technical field
The invention belongs to the technical field that magnetizes, be specifically related to a kind of magnet charger based on flywheel energy storage.
Background technology
Along with the development that the technology such as motor, domestic electronic, computer, communication are maked rapid progress, permanent magnetic material demand is increasing, and performance requirement is more and more higher.At present, permanent magnet adopts the materials such as neodymium iron boron, ferrite, aluminium nickel cobalt mostly, and have the features such as coercive force is large, stable performance, these composite materials after magnet charger big current magnetizes instantaneously, just can need be magnetized.
Existing magnet charger is divided into three kinds by the power supply presentation mode that magnetizes: pulsed magnet charger, electromagnet type magnet charger and capacitive magnetizing apparatus.
Pulsed magnet charger uses two-phase power supply to power, and its voltage is low, energy is little, can only produce the magnetic field needed, restricted application in the solenoid of very little at internal diameter (Φ less than 30);
Electromagnet type magnet charger can be accomplished very large, and magnetic field does not need to charge and directly sets up, but due to its solenoid be fixed on iron core, the workpiece be magnetized during work is positioned at solenoid outside, its magnetic field can only reach 2-2.4T, and cost is also high, and practical application effect is not good;
The magnet charger of present actual use is mostly adopt capacitive magnetizing apparatus, the pulse high current that capacitive magnetizing apparatus utilizes capacitor discharge to produce produces magnetic field by solenoid and magnetizes to magnetic material, enough magnetic field can be produced theoretically in the solenoid of any specification, but its charging capacitor capacity needs very large, bulky capacitor not only cost is high but also take up room large, because capacitor charge and discharge number of times is limited, useful life is short, in actual production, need often to change electric capacity, cause cost increase, and, electrochemical capacitor in process of production, need to use a large amount of chemical articles, very large destruction can be caused to environment, do not meet eco-friendly principle.
Summary of the invention
For the above-mentioned technological deficiency existing for prior art, the invention provides a kind of magnet charger based on flywheel energy storage, can infinitely discharge and recharge, long service life, take up room little.
Based on a magnet charger for flywheel energy storage, comprise energy-storage units and the unit that magnetizes; Described energy-storage units is by discharge and recharge for the unit that magnetizes is powered, and producing magnetic field after described unit energising of magnetizing for material to be magnetized magnetizes;
Described energy-storage units adopts energy accumulation device for fly wheel, and it comprises rectifier, current transformer, controller, electric motor units and flywheel mechanism;
Described rectifier is used for the alternating current of three phase network to be converted to direct current;
For electric motor units is powered after described current transformer is used for that described direct current is converted to alternating current, for the unit that magnetizes is powered simultaneously after the alternating current that electric motor units produces being converted to direct current;
Described electric motor units operates for driving flywheel mechanism; Under charge mode, its electric energy provided by current transformer is converted to mechanical energy, utilizes flywheel mechanism to operate and this mechanical energy is stored; Under discharge mode, the mechanical energy that flywheel mechanism stores is converted to electric energy thus produces alternating current by it;
Described controller is for controlling described current transformer.
Preferably, described flywheel mechanism comprises casing, main shaft and flywheel, and described electric motor units comprises two polyphase machines; Described main shaft is located in casing, and the upper, middle and lower portion of main shaft installs the first polyphase machine, flywheel and the second polyphase machine respectively;
Described polyphase machine comprises rotor and stator, and described rotor is installed on main shaft, and described stator has n phase winding, and every phase winding is distributed winding and along air gap circumference mal-distribution;
Described current transformer is n phase current transformer; The positive-negative input end of its DC side is corresponding with the positive-negative output end of rectifier to be connected, and the n phase output terminals of AC connects by filter reactance is corresponding with the n phase winding of stator, n be greater than 4 natural number; Can be realized driving and the suspension of flywheel head shaft by two polyphase machines, without the need to magnetic bearing, simple and compact for structure, reliability is high.
Preferably, be positioned at the auxiliary balance permanent-magnetic clamp main shaft on the upside of the first polyphase machine being arranged with and having air gap for a pair, be positioned at the axial suspension permanent-magnetic clamp main shaft on the downside of the second polyphase machine being arranged with and having air gap for a pair; The axial suspension of flywheel head shaft can be ensured.
Preferably, be positioned on the upside of the first polyphase machine and be positioned on the main shaft on the downside of the second polyphase machine and be separately installed with two auxiliary bearings by the support of bearing; Can be used for when fly wheel system suspends fault or low speed supporting flywheel rotor, in case the wearing and tearing of spline are generated heat and lose supporting functions, cause motor damage.
Preferably, be arranged with cooling package outside described polyphase machine, described cooling package is fixed on internal side of shell by cooling holder; Can effectively cool to motor.
Described casing comprises base, lower carriage, support arm and upper bracket; Lower carriage is located on base, and upper bracket is connected with lower carriage by support arm.
Preferably, between described rectifier positive-negative output end, be parallel with electric capacity, the fluctuation of flywheel discharge process median generatrix voltage can be suppressed, also reduce the control difficulty of system simultaneously.
The described unit that magnetizes is made up of switching tube and magnetizing coil, one end of switching tube is connected with the positive input terminal of current transformer DC side, the other end of switching tube is connected with one end of magnetizing coil, the other end of magnetizing coil is connected with the negative input end of current transformer DC side, and the control pole of switching tube is connected with controller.
Preferably, described controller is connected with magnetic flux density detector, and described magnetic flux density detector is for detecting the magnetic flux density of material to be magnetized; Controller is controlled the process of magnetizing, and shows the degree that magnetizes of material to be magnetized.
Preferably, described rectifier is connected with current transformer by precharge control unit; Described precharge control unit is made up of resistance and contactor; Wherein: one end of resistance is connected with one end of contactor normally opened contact K1 and connects the positive output end of rectifier, the other end of resistance is connected with the other end of contactor normally opened contact K1 and connects the positive input terminal of current transformer DC side, one end of contactor normally opened contact K2 is connected with the negative output terminal of rectifier, the other end of contactor normally opened contact K2 is connected with the negative input end of current transformer DC side, and the power on/off of contactor coil is controlled by described controller; The moment impact electric current that powers on can be suppressed the impact of rectifier and electric capacity and additional power source, prevent from causing system failure.
Described controller comprises:
Signal acquisition module, for gathering DC bus-bar voltage and the DC bus current of the stator phase currents of polyphase machine, rotor displacement amount and current transformer;
Signal transacting control module, for carrying out computing, output pwm signal according to magnetic suspension control strategy and flywheel charge and discharge control strategy to the signal that signal gathering unit collects;
Driver module, for isolating described pwm signal and exporting after power amplification, to control the break-make of device for power switching in current transformer.
Described signal processing control unit adopts DSP.
Described signal gathering unit comprises voltage sensor, current sensor, speed probe and eddy current displacement sensor, and described eddy current displacement sensor is installed on main shaft by mounting bracket.
Flywheel energy storage technique combines with the technology of magnetizing by the present invention, in charging process, is first arranged by the charge power of controller to system, and the three-phase alternating current of electrical network enters the precharge control unit of DC bus after rectifier rectification; The energy accumulation device for fly wheel charging initial stage of magnet charger, first charged by the pre-charge resistance in precharge control unit, D.C. contactor is connected again after a period of time, after completing pre-charge process, rectifier power source access DC bus, produce charging control signal by the DSP in controller again, the PWM charging control signal that controller produces controls opening and shutoff of IGBT device for power switching in current transformer, completes the constant current charge process of energy accumulation device for fly wheel.
After energy accumulation device for fly wheel charging process completes, Speed of Reaction Wheels becomes rated speed, and now flywheel enters high speed idling state, and the dominant loss that flywheel runs is the idling loss of flywheel self, and the flywheel of magnet charger will maintain at a high speed, low power operation state.
Magnet charger treat the material that magnetizes magnetize time, change the control strategy of flywheel by controller and make it to enter discharge mode, turn off control signal with Time Controller output contactor, realize energy release process fast.When electric discharge starts, controller makes the coil blackout of D.C. contactor in precharge control unit, and rectifier stops input energy.Simultaneously, controller drives power switch conducting in the unit that makes to magnetize, fly-wheel motor will enter the second quadrant and be in generator operation state, along with the reduction of Speed of Reaction Wheels, the mechanical energy stored in flywheel is being discharged rapidly by magnetizing coil after electric power generation, current transformer rectification, because the resistance of magnetizing coil is very little, so will pass through the very large electric current that magnetizes in magnetizing coil, and producing great magnetic field by magnetizing coil, the moment realizing treating the material that magnetizes magnetizes.
After magnet charger has magnetized instantaneously, by magnetic flux density detector can detect magnetize after magnetic flux in material, the result of detection feeds back to controller by magnetic flux density detector.Controller is produced by flux detection algorithm, flux detection drive current, and the magnetic flux density completed being magnetized material detects, and determines the operating state of next step magnet charger.
Advantageous Effects of the present invention is:
(1) the present invention by Flywheel energy storage technique together with magnet charger combine with technique, using energy accumulation device for fly wheel as highpowerpulse discharge power supply, in order to magnetize, unit provides energy, when having given full play to flywheel as energy-storage travelling wave tube, high power density, long-life, the distinguishing feature such as do not pollute the environment.
(2) fly wheel energy storage type magnet charger of the present invention, compared with traditional capacitive magnetizing apparatus, discharge and recharge is often, long service life, cost be also lower; Complete a work period compared with existing magnet charger, the discharge and recharge time is short, more efficiently, and the requirement of more realistic production.
(3) polyphase machine theory combines with the Suspension Mechanism of magnetic bearing machine by the present invention, integrated polyphase machine drives with suspension function in one, without the need to additionally adding radial magnetic bearing, axial space not outside occupying volume, decrease radial two ends magnetic bearings control assembly, structure is compacter, and its bearing rigidity, space availability ratio and electromagnetic efficiency etc. all improve a lot.
Accompanying drawing explanation
Fig. 1 is the structural representation of magnet charger of the present invention.
Fig. 2 is the structural representation of polyphase machine rotor and stator.
Fig. 3 is the structural representation of electric motor units and flywheel mechanism.
Fig. 4 is the control flow schematic diagram of controller of the present invention.
Embodiment
In order to more specifically describe the present invention, below in conjunction with the drawings and the specific embodiments, technical scheme of the present invention and related work principle thereof are described in detail.
As shown in Figure 1, a kind of magnet charger based on flywheel energy storage, comprises energy accumulation device for fly wheel and the unit that magnetizes; Wherein:
Energy accumulation device for fly wheel is used for by discharge and recharge for the unit that magnetizes is powered, and it comprises rectifier, current transformer, controller, electric motor units and flywheel mechanism;
Rectifier is used for the alternating current of three phase network to be converted to direct current; In present embodiment, rectifier adopts the uncontrollable rectifier bridge of three-phase six bridge arm structure, and each brachium pontis adopts some Diode series to form; Be parallel with electric capacity C between rectifier positive-negative output end, the fluctuation of flywheel discharge process median generatrix voltage can be suppressed, also reduce the control difficulty of system simultaneously.
For electric motor units is powered, for the unit that magnetizes is powered simultaneously after the alternating current that electric motor units produces being converted to direct current after current transformer is used for that the direct current that rectifier exports is converted to alternating current; In present embodiment, current transformer is 6 phase current transformers, and it is six phase 12 bridge arm structures, and each brachium pontis is in series by several IGBT, and current transformer DC side is connected with rectifier by precharge control unit, and precharge control unit is made up of resistance R and contactor; Wherein: one end of resistance R is connected with one end of contactor normally opened contact K1 and connects the positive output end of rectifier, the other end of resistance R is connected with the other end of contactor normally opened contact K1 and connects the positive input terminal of current transformer DC side, one end of contactor normally opened contact K2 is connected with the negative output terminal of rectifier, the other end of contactor normally opened contact K2 is connected with the negative input end of current transformer DC side, and the power on/off of contactor coil is controlled by controller.6 phase output terminals of AC side of converter are connected with electric motor units by filter reactance, filter reactance not only effectively can reduce the noise that flywheel energy storage system high-frequency PWM switch is introduced, reduce the electromagnetic interference to current vortex sensor, and effectively can reduce the total harmonic distortion (THD) of electric machine phase current, reduce loss and the temperature rise of motor.
Electric motor units operates for driving flywheel mechanism; Under charge mode, its electric energy provided by current transformer is converted to mechanical energy, utilizes flywheel mechanism to operate and this mechanical energy is stored; Under discharge mode, the mechanical energy that flywheel mechanism stores is converted to electric energy thus produces alternating current by it; In present embodiment, electric motor units comprises two polyphase machines, and as shown in Figure 2, polyphase machine comprises rotor (7b, 11b) and stator (7a, 11a); On the main shaft 1 that rotor (7b, 11b) is mounted on flywheel mechanism and be two to pole, rotor permanent magnet is radially same polarity arrangement, and the rotor core between permanent magnet is become another identical polarity by alternating magnetization; Stator (7a, 11a) has 6 phase windings, and 6 phase windings connect by filter reactance is corresponding with 6 phase output terminals of AC side of converter; Every phase winding is distributed winding and along air gap circumference mal-distribution, makes polyphase windings not only containing odd space harmonics, also containing even space harmonics; Each phase winding adopts distributed winding, causes number of times little compared with high space harmonics.In Fig. 2, A+ and A-represents the direction of A phase winding respectively: enter paper and by paper out, other the like.6 phase stator winding shown in figure are symmetric distributed winding, and adjacent π/3 that are separated by space, form 6 symmetrical systems, but every phase winding is not in relation to air gap circumference symmetry.
As shown in Figure 3, flywheel mechanism comprises casing, main shaft 1 and flywheel 9, and main shaft 1 is located in casing, and the upper, middle and lower portion of main shaft 1 installs the first polyphase machine 7, flywheel 9 and the second polyphase machine 11 respectively;
Casing comprises base 14, lower carriage 13, support arm 8 and upper bracket 4; Lower carriage 13 is located on base 14, and upper bracket 4 is connected with lower carriage 13 by support arm 8; The vacuum pumping of shell domestic demand, surrounds a flywheel vacuum chamber 10.
Flywheel 9 is made up of flywheel inner ring 9a and flywheel outer shroud 9b, inner and outer ring adopts high specific strength carbon fibre composite flywheel, its tensile strength is higher than metal material, the safe handling rotating speed making flywheel not occur to destroy greatly improves, the linear velocity allowed can reach 500-1000m/s, substantially increases the energy storage density of flywheel energy storage system and the rotating speed of flywheel safe handling.
Be positioned at the auxiliary balance permanent-magnetic clamp 17 main shaft 1 on the upside of the first polyphase machine 7 being arranged with and having air gap for a pair, be positioned at the axial suspension permanent-magnetic clamp 12 main shaft 1 on the downside of the second polyphase machine 11 being arranged with and having air gap for a pair; The axial suspension of flywheel head shaft can be ensured.
Be positioned on the upside of the first polyphase machine 7 and be positioned on the main shaft 1 on the downside of the second polyphase machine 11 and be separately installed with two auxiliary bearings (18,16) by the support of bearing 3; Auxiliary bearing adopts high-speed ball bearing, can be used for supporting flywheel rotor when fly wheel system suspends fault or low speed, in case the wearing and tearing of spline are generated heat and lose supporting functions, causes motor damage.
Polyphase machine is arranged with cooling package 6 outside (7,11), and cooling package 6 is fixed on internal side of shell by cooling holder 5; Cooling package adopts cooling pipe component, and blasthole and apopore lay respectively at the both sides of casing axis, can effectively cool to motor.
The two ends of main shaft 1 are radially separately installed with two pairs of eddy current displacement sensors (2,15) by mounting bracket, and two eddy current displacement sensors of every a pair become mutual at right angle setting.
Controller is used for providing pwm signal for the device for power switching IGBT in current transformer, and it comprises: signal acquisition module, signal transacting control module and driver module; Wherein:
Signal acquisition module is for gathering the stator phase currents i of polyphase machine
a~ i
f, rotor displacement amount θ and current transformer DC bus-bar voltage U
dcwith DC bus current I
dc; It comprises voltage sensor, current sensor, speed probe and eddy current displacement sensor.
Signal transacting control module is used for carrying out computing, output pwm signal according to magnetic suspension control strategy and flywheel charge and discharge control strategy to the signal that signal gathering unit collects; In present embodiment, signal processing control unit adopts DSP.
Driver element module is isolated pwm signal and is exported after power amplification, to control the break-make of device for power switching IGBT in current transformer.
Produce magnetic field after the unit that magnetizes energising to magnetize for material to be magnetized, it is made up of IGBT pipe S and magnetizing coil L, the collector electrode of IGBT pipe S is connected with the positive input terminal of current transformer DC side, the emitter of IGBT pipe S is connected with one end of magnetizing coil L, the other end of magnetizing coil L is connected with the negative input end of current transformer DC side, and the gate pole of IGBT pipe S is connected with controller.
The resistance of magnetizing coil L is very little, and when IGBT pipe S opens, energy accumulation device for fly wheel exports energy, by very large electric current, will produce great magnetic field in coil, and complete instantaneously and treat magnetizing of the material that magnetizes in magnetizing coil L.Suppose under the operating state that magnetizes, the output voltage that energy accumulation device for fly wheel produces is U, and the resistance in magnetizing coil loop is R
l, induction reactance is Z
l, according to Ohm's law, the moment of IGBT pipe S conducting, the electric current produced in magnetizing coil L is I
l=U/ (Z
l+ R
l), then according to maxwell's circuital law, can obtain the magnetic field intensity producing magnetic field in magnetizing coil L is H=N*I
l/ L, magnetic induction density B=H/ μ, wherein μ is magnetic permeability, and because the process of magnetizing completes instantaneously, the magnetic field produced in coil is very big, can complete the moment for the treatment of the material that magnetizes instantaneously to magnetize.
Controller is connected with magnetic flux density detector, and it is for detecting the magnetic flux density of material to be magnetized; Controller is controlled the process of magnetizing, and shows the degree that magnetizes of material to be magnetized, whether qualified to judge the properties of product of this batch.
Present embodiment adopts i
d=0 control strategy controls above-mentioned two surface-adhered type permanent magnetism polyphase machines, the concrete signal processing of controller as shown in Figure 4:
At torque plane (d
1-q
1), realize flywheel charge and discharge control rapidly and efficiently by rotor field-oriented vector control: first sensor sample DC bus-bar voltage U
dc, DC bus current I
dc, stator current i
a~ i
f, the signal such as rotor displacement amount θ, after over-sampling modulate circuit and heterogeneous coordinate transform, obtain the value of feedback under synchronous rotating frame and feedforward value.
Under charge mode, given rotating speed ω
m *with feedback rotational speed omega
m(wherein
p is rotor number of poles) do difference after, try to achieve the set-point i of torque plane current through rotating speed outer shroud pi regulator
q1s *, then obtain the set-point v of voltage through the control of current inner loop pi regulator
d1s *and v
q1s *, obtained the switching drive signal of each power device by PWM pulse-width modulation, realize the constant current charge process of flywheel energy storage system.
Under discharge mode, given DC bus-bar voltage v
dc *with feedback DC bus-bar voltage U
dcby busbar voltage outer shroud pi regulator and the load current I that feedovers after doing difference
dcadd up and obtain i
dc *, through alternating current-direct current side steady state power equilibrium relation (
wherein Ψ
mfor permanent magnet flux linkage,
) calculate the specified rate i of interior circular current
q1s *, then obtain the set-point v of voltage through the control of current inner loop adjuster
d1s *and v
q1s *, after coordinate inversion, then obtained the switching drive signal of each power device by PWM pulse modulation technology, also reduce DC voltage fluctuation while realizing the feedback of fly wheel system energy stabilization, improve the antijamming capability of load current.The polyphase machine of two coaxial connections realizes quick, the stable charge and discharge control of flywheel energy storage system under controller coordinate controls.
At suspended planar (d
2-q
2), by regulating controllable radial power to control rotor displacement, realize the stable suspersion of flywheel head shaft.The generation of radial load comes from torque field and suspension magnetic interacts, and the generation that namely torque field is suspending power provides bias magnetic field.Orientation on rotor flux rotor magnetic linkage is by the excitation component i of stator torque current
d2scontrol, current i
q2swith rotor flux Ψ
d1rbetween achieve decoupling zero, there is good speed adjusting performance.First radial X, Y two actual displacement amount α and β on direction is obtained, with given displacement α by eddy current displacement sensor
*and β
*after doing to differ from relatively, obtain radial suspending power reference value F through PID adjuster
α *and F
β *.By suspending power Current calculation formula (
wherein L
1sand L
2sthe first and second planar inductors, g
0for gas length, Ψ
mfor permanent magnet flux linkage), ask for the reference value i of suspended planar electric current
q2s *and i
d2s *, then obtain the set-point v of voltage through the control of current inner loop adjuster
d2s *and v
q2s *, after coordinate inversion, then obtained the switching drive signal of each power device by PWM pulse modulation technology, realize the suspension of radial four degrees of freedom of flywheel energy storage system.
Flywheel energy storage technique combines with the technology of magnetizing by present embodiment, in charging process, is first arranged by the charge power of controller to system, and the three-phase alternating current of electrical network enters the precharge control unit of DC bus after rectifier rectification; The energy accumulation device for fly wheel charging initial stage of magnet charger, first charged by the pre-charge resistance in precharge control unit, D.C. contactor is connected again after a period of time, after completing pre-charge process, rectifier power source access DC bus, produce charging control signal by the DSP in controller again, the PWM charging control signal that controller produces controls opening and shutoff of IGBT device for power switching in current transformer, completes the constant current charge process of energy accumulation device for fly wheel.
After energy accumulation device for fly wheel charging process completes, Speed of Reaction Wheels becomes rated speed, and now flywheel enters high speed idling state, and the dominant loss that flywheel runs is the idling loss of flywheel self, and the flywheel of magnet charger will maintain at a high speed, low power operation state.
Magnet charger treat the material that magnetizes magnetize time, change the control strategy of flywheel by controller and make it to enter discharge mode, turn off control signal with Time Controller output contactor, realize energy release process fast.When electric discharge starts, controller makes the coil blackout of D.C. contactor in precharge control unit, and rectifier stops input energy.Simultaneously, controller drives power switch conducting in the unit that makes to magnetize, fly-wheel motor will enter the second quadrant and be in generator operation state, along with the reduction of Speed of Reaction Wheels, the mechanical energy stored in flywheel is being discharged rapidly by magnetizing coil after electric power generation, current transformer rectification, because the resistance of magnetizing coil is very little, so will pass through the very large electric current that magnetizes in magnetizing coil, and producing great magnetic field by magnetizing coil, the moment realizing treating the material that magnetizes magnetizes.
After magnet charger has magnetized instantaneously, by magnetic flux density detector can detect magnetize after magnetic flux in material, the result of detection feeds back to controller by magnetic flux density detector.Controller is produced by flux detection algorithm, flux detection drive current, and the magnetic flux density completed being magnetized material detects, and determines the operating state of next step magnet charger.
After once having magnetized, the circulation that present embodiment will reenter under the control of the controller " recharge-discharge-magnetize ".
Claims (1)
1., based on a magnet charger for flywheel energy storage, comprise energy-storage units and the unit that magnetizes; Described energy-storage units for the unit that magnetizes is powered, produces magnetic field after described unit energising of magnetizing by discharge and recharge; It is characterized in that:
Described energy-storage units adopts energy accumulation device for fly wheel, and it comprises rectifier, current transformer, controller, electric motor units and flywheel mechanism; Wherein:
Described rectifier is used for the alternating current of three phase network to be converted to direct current;
For electric motor units is powered after described current transformer is used for that described direct current is converted to alternating current, for the unit that magnetizes is powered simultaneously after the alternating current that electric motor units produces being converted to direct current;
Described electric motor units operates for driving flywheel mechanism; Under charge mode, its electric energy provided by current transformer is converted to mechanical energy, utilizes flywheel mechanism to operate and this mechanical energy is stored; Under discharge mode, the mechanical energy that flywheel mechanism stores is converted to electric energy thus produces alternating current by it;
Described controller is for controlling described current transformer;
Described flywheel mechanism comprises casing, main shaft and flywheel, and described electric motor units comprises two polyphase machines; Described main shaft is located in casing, and the upper, middle and lower portion of main shaft installs the first polyphase machine, flywheel and the second polyphase machine respectively;
Described polyphase machine comprises rotor and stator, and described rotor is installed on main shaft, and described stator has n phase winding, and every phase winding is distributed winding and along air gap circumference mal-distribution;
Described current transformer is n phase current transformer; The positive-negative input end of its DC side is corresponding with the positive-negative output end of rectifier to be connected, and the n phase output terminals of AC connects by filter reactance is corresponding with the n phase winding of stator, n be greater than 4 natural number;
Be positioned at the auxiliary balance permanent-magnetic clamp main shaft on the upside of the first polyphase machine being arranged with and having air gap for a pair, be positioned at the axial suspension permanent-magnetic clamp main shaft on the downside of the second polyphase machine being arranged with and having air gap for a pair;
Be positioned on the upside of the first polyphase machine and be positioned on the main shaft on the downside of the second polyphase machine and be separately installed with two auxiliary bearings by the support of bearing;
Be arranged with cooling package outside described polyphase machine, described cooling package is fixed on internal side of shell by cooling holder; Electric capacity is parallel with between described rectifier positive-negative output end;
Described controller is connected with magnetic flux density detector, and described magnetic flux density detector is for detecting the magnetic flux density of material to be magnetized;
Described rectifier is connected with current transformer by precharge control unit; Described precharge control unit is made up of resistance and contactor; Wherein: one end of resistance is connected with one end of contactor normally opened contact K1 and connects the positive output end of rectifier, the other end of resistance is connected with the other end of contactor normally opened contact K1 and connects the positive input terminal of current transformer DC side, one end of contactor normally opened contact K2 is connected with the negative output terminal of rectifier, the other end of contactor normally opened contact K2 is connected with the negative input end of current transformer DC side, and the power on/off of contactor coil is controlled by described controller;
Described controller comprises:
Signal acquisition module, for gathering DC bus-bar voltage and the DC bus current of the stator phase currents of polyphase machine, rotor displacement amount and current transformer;
Signal transacting control module, for carrying out computing, output pwm signal according to magnetic suspension control strategy and flywheel charge and discharge control strategy to the signal that signal gathering unit collects;
Driver module, for isolating described pwm signal and exporting after power amplification, to control the break-make of device for power switching in current transformer.
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| CN105337398A (en) * | 2015-11-18 | 2016-02-17 | 珠海格力节能环保制冷技术研究中心有限公司 | Energy feedback method and system for magnetic bearing |
| CN106199095A (en) * | 2016-07-25 | 2016-12-07 | 大连华锐重工集团股份有限公司 | Double-feed current transformer formula high-current generation device |
| CN107123503B (en) * | 2017-06-29 | 2019-01-18 | 辽宁科技学院 | Pre-regulation and control device for permanent magnet motor rotor magnetization |
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