CN108092461A - A kind of electromagnetic type power generator based on body kinetic energy - Google Patents
A kind of electromagnetic type power generator based on body kinetic energy Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/18—Structural association of electric generators with mechanical driving motors, e.g. with turbines
- H02K7/1807—Rotary generators
- H02K7/1861—Rotary generators driven by animals or vehicles
Abstract
The invention belongs to technical field of power generation, disclose a kind of electromagnetic type power generator based on body kinetic energy, including：Using human motion analysis, intend the relevant information of the position of arrangement power generator according to limbs, determine unbalanced rotor relative dimensions parameter in power generator；According to the electromagnetic damping information of coil in the loaded state, the design parameter of rotor coil is adjusted, ensureing the amplitude energy of human body motive position can drive unbalanced rotor persistently to do circle rotation movement；Using the three-dimensional static of Ansoft three-dimensional modules, Transient module, simulation analysis are carried out to model output parameters, verify the electromagnetic type power generator based on body kinetic energy.System is embedded in including stator permanent magnet in stator base, arrangement rotor pedestal above stator permanent magnet, damascene wiring iron core on rotor pedestal, wound coil winding on iron-core coil.The present invention is small, light-weight, is easy to be combined generated energy in acquisition human motion with human body position is converted into electric energy.
Description
Technical field
The invention belongs to technical field of power generation more particularly to a kind of electromagnetic type power generator based on body kinetic energy.
Background technology
In recent years, with the civil micros such as palm PC, microcam electronic equipment and display the helmet, it is infrared into
The rapid development of the military hardwares such as picture, wireless telecommunications, the powerup issue of these electronic equipments also gradually cause domestic and international scientific research
The concern of worker.There is the defects of storage electricity is few, service life is short in traditional chemical accumulator, to a certain extent not
It disclosure satisfy that modern electronic equipment requirement.Particularly during army's modernization construction, Modern Electronic equipment is significantly sent out
Exhibition and equipment, and these equipment are required for steady and sustained power supply to power, if using traditional chemical battery powered, these are equipment
The battery of power supply by be soldier heavy burden.In addition, traditional chemical battery there is it is apparent the defects of：Firstth, it stores energy
Amount and the finiteness for electric life, make it be needed replacing after service life, cause environmental pollution and recycling problem；Second, it passes
Battery volume of uniting is larger, constrains the micromation and integrated of electricity consumption equipment.Thus, it is new to light, heat, wind, wave, tide energy etc.
The acquisition and utilization of the energy have been to be concerned by more and more people, however the utilization of the above-mentioned energy is subject to region, time etc. all a plurality of
Part limits.Limb motion in human walking procedure is richly stored with energy, and convenient for acquisition and utilizes.Do not influencing people
In the case of class normal activity, a kind of electricity energy harvester is studied, by endlessly energy is converted into stabilization in human motion
Electric energy provide power supply for these electronic equipments, will be future life bring great convenience.At present, it is real by energy collection technology
The conversion of existing vibrational energy is the problem in a unusual forward position.For vibrational energy acquisition research mainly have electromagnetic type, piezoelectric type,
Electrostatic, magnetostriction type, triboelectrification formula, combined type etc. adopt energy principle, and wherein piezoelectric type energy acquisition mode shakes miniature
Great research application is obtained in energy acquisition, but brittle fracture easily occurs for piezoelectric material so that its application is limited
System, and electromagnetic vibration energy acquisition mode has without driving power, environmental suitability is strong, frequency acquisition Duan Guang, output electricity
Flow the advantages that larger.The research of electromagnetic energy acquisition mode is to realize the important method of vibrational energy conversion, and research is more
It is ripe.Early in 2003, Hong Kong Chinese University had developed a kind of AA batteries miniature power generating device, sent the P-to-P voltage of 1.44V
With the power output of 20 μ W, however its small output power it is more demanding to the power attenuation of post processing circuitry and it is actual should
Small power can not provide sufficient electric energy for most of electrical equipments in.King, which wears, red et al. has studied a kind of sandwich electricity
Magnetic energy collector can generate the maximum output voltage of 125mV, but its voltage is unable to reach the cut-in voltage value of diode, so
Fine start voltage post processing circuitry is needed, drastically increases cost.Duffy and Carroll proposes one kind and is positioned over sole
The sliding magnet generator of interior collector's walking energy can provide the output power of 1mW.Electromagnetic energy harvester at present
Output voltage is greatly all in millivolt level, output power only number milliwatt.It is low for electromagnetic energy harvester output voltage, power
The problem of, research how to improve output voltage and power with reach can practical level have important practical significance.
In conclusion problem existing in the prior art is：Electromagnetic type body kinetic energy harvester output voltage, power are low.
The content of the invention
In view of the problems of the existing technology, the present invention provides a kind of electromagnetic type power generator based on body kinetic energy,
The present invention is achieved in that a kind of electromagnetic type power generator based on body kinetic energy, described to be based on body kinetic energy
Electromagnetic type power generator comprise the following steps：
Step 1 using human motion analysis, is intended the movement velocity of the position of arrangement power generator according to limbs, is accelerated
Degree, the relevant information of vibration amplitude, determine unbalanced rotor relative dimensions parameter；
Step 2 according to the electromagnetic damping information of coil in the loaded state, adjusts the design parameter of rotor coil, ensures
The amplitude energy at human motion position can drive unbalanced rotor persistently to do circle rotation movement；
Step 3, using the three-dimensional static of the Ansoft three-dimensional modules of Ansoft Maxwell softwares, Transient module,
Simulation analysis are carried out to output parameters such as model voltage, electric current, power, verify the electromagnetic type power generator based on body kinetic energy.
Further, the equation of motion of the power generator can be by an X(t)=AxThe reciprocating linear vibration of sin ω t is applied
It is added in the unbalanced rotor of generator, wherein, AxTo be applied to the amplitude of acceleration on rotor, ω adds to be applied on rotor
The angular frequency of speed draws the equation of motion of rotor when its is horizontally disposed：
When device is arranged vertically, the effect of gravity, the equation of motion table of rotor are added in the force analysis of rotor
State for：
In formula：M is rotor quality, and a is the distance from rotation axis to rotor centroid, AxFor input acceleration amplitude, J is
The moment of inertia, θ be rotor the anglec of rotation, ω by application oscillating movement angular frequency, CeIt is damped for electromechanics.
Further, the primary condition of the rotor autoexcitation rotation is：
Further, the relation of the effective length of the value and coil of the open circuit electromotive force of the generator is：
In formula：VTemFor generator output open-circuit voltage, B be coil effective length position remnant field, leff
For the effective length of coil, lrFor the radius of rotor, lwFor the physical length of coil；
The total length of coil spiral is about：
In formula, NTFor coil total number of turns, it is defined as every layer of coil turn and is multiplied by the coil number of plies, D0For the outer diameter of coil,
DiFor the internal diameter of coil；
Magnetic field at magnet z is calculated as：
T in formulamRepresent the thickness of magnet, r1Represent the radius of magnet.
Further, the power for being transferred to load resistance is expressed as：
In formula, RLRepresent generator external load resistance, RTintRepresent the resistance of generator coil；
Generator coil resistance is acquired by the resistance formula calculating of conducting wire：
Wherein, ρ be winding wire resistivity, lwFor winding wire length, NcRepresent number of coils, A is the transversal of conducting wire
Area；
Electromagnetic damping is expressed as：
The electromagnetic damping of generator depends on the load resistance of kinetic energy harvester, and is inversely proportional with load resistance.
It is described to be based on another object of the present invention is to provide a kind of electromagnetic type power generator based on body kinetic energy
The stator permanent magnet of the electromagnetic type power generator of body kinetic energy is embedded in stator base, arrangement rotor base above stator permanent magnet
Seat, damascene wiring iron core on rotor pedestal, wound coil winding on iron-core coil.
Further, the electromagnetic type power generator comprehensive selection based on body kinetic energy and design its basic size centered on
120 degree of angle, rotor radius 50mm, be highly 20mm, rotor by four groups of a diameter of 0.15mm copper conductors and with orthogonal ring around
Line mode forms single-phase output around head and the tail series connection.
Advantages of the present invention and good effect are：Electromagnetic type power generator based on body kinetic energy has small, weight
Gently, it is easy to be combined to gather generated energy in human motion with human body position and is converted into electric energy, is not required to specially take
Band.Device is diameter 100mm, the cylinder of thickness 50mm, small volume, and gross mass about only has 390g, compared to Afghanistan
For average every 5 days 88 section AA batteries of U.S. army nearly weigh the carrying amount of 2640g, there is great portability.Electromagnetic type generation technology
With it is simple in structure, material is readily available.Compared with existing ambient vibration energy collecting device, body kinetic energy power generator is adopted
Collection body kinetic energy is converted into electric energy, Energy distribution extensively and from the influence of the factors such as region, weather, time, environment, energy
Source is relatively stable and abundant.Compared with similar achievement in research, kinetic energy is gathered to be had with the output voltage and power of conversion equipment
Significantly promoted, be not required micro energy lose, fine start voltage high cost post processing circuitry cooperation, electrical equipment can be directly fed
Or charge after common current rectifying and wave filtering circuit module completes AC-DC conversion for accumulator, equipment is only led by epoxy resin, copper
The cheap material such as line, iron core is made, simple in structure to be easy to get, compared with existing high battery price, electric cost
It is relatively low.
Description of the drawings
Fig. 1 is the electromagnetic type power generator flow chart provided in an embodiment of the present invention based on body kinetic energy；
Fig. 2 is the structure diagram of Ansoft three-dimensional modules provided in an embodiment of the present invention；
In figure：1st, stator permanent magnet；2nd, stator base；3rd, iron-core coil；4th, coil windings；5th, rotor pedestal.
Fig. 3 horizontal front-rear direction accelerating curve schematic diagrames when being people's walking provided in an embodiment of the present invention.
Fig. 4 is two provided in an embodiment of the present invention different testers in normal leg speed walking Zhong Suoce foots acceleration
Gait feature signal waveforms；Wherein transverse axis unit is ms, and longitudinal axis unit is acceleration of gravity；
In figure：(a) vertical direction acceleration；(b) horizontal direction acceleration.
Fig. 5 is the Distribution of Magnetic Field schematic diagram of coil unbalanced rotor model provided in an embodiment of the present invention；
In figure：(a) in rotor coil and rotor core magnetic field distribution situation；(b) magnetic field is in stator permanent magnet
Distribution situation.
Fig. 6 is that coil flux amount provided in an embodiment of the present invention changes with time relation schematic diagram.
Fig. 7 is that open-circuit voltage provided in an embodiment of the present invention changes with time relation schematic diagram.
Fig. 8 is output power provided in an embodiment of the present invention with resistance change schematic diagram.
Fig. 9 is that output voltage provided in an embodiment of the present invention changes over time schematic diagram.
Figure 10 is that output current provided in an embodiment of the present invention changes over time schematic diagram.
Specific embodiment
In order to further understand the content, features and effects of the present invention, the following examples are hereby given, and coordinate attached drawing
Detailed description are as follows.
The structure of the present invention is explained in detail below in conjunction with the accompanying drawings.
As shown in Figure 1, the electromagnetic type power generator provided in an embodiment of the present invention based on body kinetic energy comprises the following steps：
S101：Using human motion analysis, intend according to limbs the movement velocity of the position of arrangement power generator, acceleration,
The relevant information of vibration amplitude determines unbalanced rotor relative dimensions parameter；
S102：According to the electromagnetic damping information of coil in the loaded state, the design parameter of rotor coil, guarantor are adjusted
The amplitude energy of body motive position can drive unbalanced rotor persistently to do circle rotation movement；
S103：It is right using the three-dimensional static of the Ansoft three-dimensional modules of Ansoft Maxwell softwares, Transient module
The output parameters such as model voltage, electric current, power carry out simulation analysis, verify the electromagnetic type power generator based on body kinetic energy.
As shown in Fig. 2, power generator threedimensional model is embedded in including stator permanent magnet 1 in stator base 2, stator permanent magnet
Rotor pedestal 5 is inlayed in 1 top, damascene wiring iron core 3 on rotor pedestal 5, wound coil winding 4 on iron-core coil 3.
The application principle of the present invention is further described below in conjunction with the accompanying drawings.
The unbalanced rotor of equipment designed by the present invention is the segment that radius is 50mm, and position of centre of gravity is away from the center of circle
The position of 38mm, concrete analysis are as follows：The work of the power generator is collection of energy and electromagnetic induction based on unbalanced rotor
Electric energy transforming principle.
The accelerating curve of ankle horizontal direction when Fig. 3 show day for human beings Chang Buhang.In figure G points to A points be foot in walking
It lands the stage stopped on the ground, acceleration zero, and amplitude variation is almost nil；A points land for foot into driving phase
Afterwards, the heel liftoff stage lifted, there are no liftoff, the acceleration of A points to B points reversely slowly increases ball of foot for one at this time
The process added；Then B points start rapid positive direction increase to C point acceleration, and after C points lift for heel, ball of foot lifts, foot
At the time of will starting to swing, the rapid positive increase of acceleration.To E points, for foot, recovery phase, acceleration forward direction subtract C points forward
It is small, and inversely increase；At the time of E points terminate recovery phase for gait cycle, heel starts to contact ground, E points acceleration hair
Raw mutation, and tend towards stability reaching the variation of F points post-acceleration.
People's acceleration of ankle in walking is applied in unbalanced rotor, and unbalanced rotor is caused to rotate, device acquisition
Kinetic energy in human motion and by the rotation that transform linear motion is unbalanced rotor, the kinetic energy of rotor rotation by permanent magnet,
Air gap, coil, the magnetic flux path of iron core form the coupling of air-gap field, and changing for coil flux amount is caused in rotor rotation process
Become, and then by faraday electromagnetic induction theoremIt understanding, coil forms electromotive force and produces electricl energy output, from
And body kinetic energy is converted into electric energy.
The new unbalanced rotor formula body kinetic energy acquisition that the present invention is proposed and designed is with conversion equipment mainly by air gap point
Two parts of stator and rotor are divided into, there is the couplings of air-gap field between the two.Device master-plan is cylindrical structure,
A diameter of 100mm, high 50mm.In rotor structure, according to the analysis and research to human leg's movement characteristic, according under
The calculating of the equation of motion in literary theory analysis considers that the electromagnetic damping of the device for converting electric energy under a fixed load rotates rotor
Influence, ensureing that rotor can be under human normal walking under the Essential Performance Requirements that continuously run, comprehensive selection and design
120 degree of angle, rotor radius 50mm centered on its basic size, highly it is 20mm, rotor is led by four groups of a diameter of 0.15mm copper
Line simultaneously forms single-phase output with orthogonal ring winding mode around head and the tail series connection.
Fig. 4 show gait feature signal wave of two different testers in normal leg speed walking Zhong Suoce foots acceleration
Shape figure, wherein transverse axis unit are ms, and longitudinal axis unit is gravity acceleration gn。
According to being analyzed in figure, the equation of motion of power generator can be approximately by an X(t)=AxThe reciprocating linear of sin ω t
Vibration is applied in the unbalanced rotor of generator, wherein, AxTo be applied to the amplitude of acceleration on rotor, ω turns to be applied to
The angular frequency of acceleration on son draws the equation of motion of rotor when its is horizontally disposed：
When device is arranged vertically, the effect of gravity is added in the force analysis of rotor, so the movement side of rotor
Journey can be expressed as：
In formula：M is rotor quality, and a is the distance from rotation axis to rotor centroid, AxFor input acceleration amplitude, J is
The moment of inertia, θ be rotor the anglec of rotation, ω by application oscillating movement angular frequency, CeIt is damped for electromechanics.
Rotor autoexcitation rotation primary condition be：
Inequality (3) shows that there is continuous self-excitation to rotate, and rotor, which needs to have, is more than applied vibration angular frequency
The initial angular velocity of rate.
Inequality (4) shows that too big electromagnetic damping will cause unbalanced rotor can not autoexcitation rotation.
The relation of the value of the open circuit electromotive force of generator and the effective length of coil is：
In formula：VTemFor generator output open-circuit voltage, B be coil effective length position remnant field, leff
For the effective length of coil, lrFor the radius of rotor, lwFor the physical length of coil.
The total length of coil spiral is about：
In formula, NTFor coil total number of turns, it is defined as every layer of coil turn and is multiplied by the coil number of plies, D0For the outer diameter of coil,
DiFor the internal diameter of coil.
Because meeting is away from coil in permanent magnet rotary course, the remanent magnetism of coil must be recalculated, at magnet z
Magnetic field can be calculated as：
T in formulamRepresent the thickness of magnet, r1Represent the radius of magnet.
Because coil is all cascaded, so, the internal resistance of motor is the series connection of 4 independent resistors.Due to per a period of time
It carves and there was only 4 blocks of effective magnet, so voltage can be considered as four voltage sources of series connection, thus, it is transferred to the power of load resistance
It is represented by：
In formula, RLRepresent generator external load resistance, RTintRepresent the resistance of generator coil.
Generator coil resistance can be calculated by the resistance formula of conducting wire and acquired：
Wherein, ρ be winding wire resistivity, lwFor winding wire length, NcRepresent number of coils, A is the transversal of conducting wire
Area.
According to above-mentioned analysis, it can be seen that maximum power output value is generated at optimum load resistance, and optimum load is electric
Resistance value is equal to the coil internal resistance value of motor.It can also draw, the size of electromagnetic damping is by the size depending on load resistance.Cause
And output power can be defined according to electromagnetic damping, in order to find electromagnetic damping value, need to find first by coil and magnet it
Between electromagnetic force caused by torque.
According to formula (2), electromagnetic torque is defined as：
The power that can also be defined as due to torque on angular frequency, the torque as caused by electromagnetic damping can define
For：
Formula 11 is made to distinguish with formula 12 equal, then electromagnetic damping is represented by：
Above formula shows that the electromagnetic damping of generator depends on the load resistance of kinetic energy harvester, and and load resistance
It is inversely proportional.
According to formula (4)It can determine the value of electromagnetic damping, and then determined according to formula (13) in coil
The sum of resistance value and external resistance.Output power during according to interior resistance and external resistance equal value reaches maximum, so as to respectively
Obtain the value of interior resistance and external resistance.It is the ruler that can obtain coil according to the numerical value of interior resistance and the cross-sectional area of winding wire
It is very little, and the relative size according to electromagnetic damping value and coil and iron core cross-sectional area carries out coil parameter adjustment.
The plant bulk finally obtained is：Device total height is 50mm；Air-gap separation is 5mm between rotor；Stator is high
It spends for 25mm, a diameter of 100mm；Stator is center of circle fluting 16 groups of permanent magnets of arrangement along the inside circumference away from stator center of circle 38mm,
Permanent magnet is a diameter of 18mm, the cylinder of a height of 7.5mm；The fan-shaped cylinder that rotor is 120 degree of central angle, radius is 50mm；
Rotor is center of circle fluting 4 groups of coils of arrangement and iron core along the circular arc away from fan-shaped circle center distance 38mm, and iron core is diameter 6mm, height
The cylinder of 20mm, coil form the cylinder of a diameter of 18mm, high 20mm for enameled wire around iron core, and every group of coil is each on rotor
Spacing is 1 degree away from rotor side 2 degree of central angles, both sides upper rotor part central angle between accounting for 40 degree, two groups of fan shape center angle coil.
As shown in figure 5, by the simulation analysis of magnetostatic field, draw the Distribution of Magnetic Field of mounted cast, show and turn in (a) figure
The distribution situation in magnetic field in subcoil and rotor core, it can be seen that the flux density in rotor core is larger, flux density phase in coil
Ground is answered to reduce, but flux density is more uniform in coil, illustrates that the presence of iron core enhances the magnetic field in coil.(b) shown in figure
Distribution situation of the magnetic field in stator permanent magnet, the flux density at magnetic blow out centre is smaller, and magnetic field is increased from center to outer rim
Trend.
In transient field emulation setting, the 2Hz leg speeds walked with human normal are set as the rotating speed of rotor, to simplify program
Setting is at the uniform velocity rotated the rotation of unbalanced rotor is driven to be assumed to be in human body walking.It is tested by Transient, obtains model
Output parameter.Fig. 6 is with the rotation of rotor, and the magnetic flux through coil changes with time relation, and Fig. 7 is coil rotor
Open-circuit voltage versus time curve.
As can be seen that magnetic flux generates good sinusoidal waveform with the rotation of rotor in coil, peak flux is reachable
About 0.475Wb；With the rotation of rotor, open-circuit voltage does sinusoidal variations, and maximum peak voltage can reach 38V, open circuit electricity
Corrugating sine is preferable.
For power generator model under ohmic load state, rotor rotation causes stator permanent magnet relative rotation, forms rotation
Magnetic field occurs alternation by the magnetic linkage of rotor coil, so as to form electrical potential difference at coil both ends, is formed by dispatch from foreign news agency resistance circuit
Closed circuit exports electric energy.In simulations, carried out the value of load resistance from 10 Ω to 310 Ω using 10 Ω as difference at equal intervals
Scan operation is parameterized, the output power with the variation model of resistance constantly changes, and physical relationship is as shown in Figure 8.
The analysis of connecting resistance variable parameter scanning result is learnt outside device, the load resistance for being 230 Ω in access resistance value
When output power about reach maximum, output power virtual value is about 1.6W at this time.
According to Transient as a result, when load resistance is 230 Ω, the output voltage and electric current of the model are respectively depicted as
Shown in Fig. 9 and Figure 10.
As can be seen that the waveform output of load voltage is good sine wave, crest voltage 24.2V；Load current
Waveform for sine wave, peak point current is about 0.0964A, and the available peak power output of device is 1.6W.
The above is only the preferred embodiments of the present invention, and not makees limitation in any form to the present invention,
Every technical spirit according to the invention belongs to any simple modification made for any of the above embodiments, equivalent variations and modification
In the range of technical solution of the present invention.
Claims (7)
- A kind of 1. electromagnetic type power generator based on body kinetic energy, which is characterized in that the electromagnetic type hair based on body kinetic energy Electric installation comprises the following steps：Step 1, using human motion analysis, foundation limbs are intended arranging the movement velocity of the position of power generator, acceleration, shake The relevant information of dynamic amplitude, determines unbalanced rotor relative dimensions parameter；Step 2 according to the electromagnetic damping information of coil in the loaded state, adjusts the design parameter of rotor coil；Step 3, using the three-dimensional static of the Ansoft three-dimensional modules of Ansoft Maxwell softwares, Transient module, to mould Type voltage, electric current, power output parameter carry out simulation analysis, verify the electromagnetic type power generator based on body kinetic energy.
- 2. the electromagnetic type power generator based on body kinetic energy as described in claim 1, which is characterized in that the power generator The equation of motion can be by an X(t)=AxThe reciprocating linear vibration of sin ω t is applied in the unbalanced rotor of generator, In, AxTo be applied to the amplitude of acceleration on rotor, ω is the angular frequency for being applied to acceleration on rotor, show that its is horizontally disposed When rotor the equation of motion：<mrow> <mo>(</mo> <msup> <mi>ma</mi> <mn>2</mn> </msup> <mo>+</mo> <mi>J</mi> <mo>)</mo> <mover> <mi>&theta;</mi> <mo>&CenterDot;&CenterDot;</mo> </mover> <mo>+</mo> <msub> <mi>C</mi> <mi>e</mi> </msub> <mover> <mi>&theta;</mi> <mo>&CenterDot;</mo> </mover> <mo>=</mo> <msub> <mi>maA</mi> <mi>x</mi> </msub> <msup> <mi>&omega;</mi> <mn>2</mn> </msup> <mi>s</mi> <mi>i</mi> <mi>n</mi> <mi>&theta;</mi> <mi>s</mi> <mi>i</mi> <mi>n</mi> <mi>&omega;</mi> <mi>t</mi> <mo>;</mo> </mrow>When device is arranged vertically, the effect of gravity is added in the force analysis of rotor, the equation of motion of rotor is expressed as：<mrow> <mo>(</mo> <msup> <mi>ma</mi> <mn>2</mn> </msup> <mo>+</mo> <mi>J</mi> <mo>)</mo> <mover> <mi>&theta;</mi> <mo>&CenterDot;&CenterDot;</mo> </mover> <mo>+</mo> <msub> <mi>C</mi> <mi>e</mi> </msub> <mover> <mi>&theta;</mi> <mo>&CenterDot;</mo> </mover> <mo>=</mo> <msub> <mi>maA</mi> <mi>x</mi> </msub> <msup> <mi>&omega;</mi> <mn>2</mn> </msup> <mi>s</mi> <mi>i</mi> <mi>n</mi> <mi>&theta;</mi> <mi>s</mi> <mi>i</mi> <mi>n</mi> <mi>&omega;</mi> <mi>t</mi> <mo>-</mo> <mi>m</mi> <mi>g</mi> <mi>a</mi> <mi> </mi> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mi>&theta;</mi> <mo>;</mo> </mrow>In formula：M is rotor quality, and a is the distance from rotation axis to rotor centroid, AxFor input acceleration amplitude, J is inertia Square, θ be rotor the anglec of rotation, ω by application oscillating movement angular frequency, CeIt is damped for electromechanics.
- 3. the electromagnetic type power generator based on body kinetic energy as described in claim 1, which is characterized in that the rotor autoexcitation The primary condition of rotation is：<mrow> <mo>|</mo> <mover> <mi>&theta;</mi> <mo>&CenterDot;</mo> </mover> <msub> <mo>|</mo> <mrow> <mi>t</mi> <mo>=</mo> <mn>0</mn> </mrow> </msub> <mo>></mo> <mi>&omega;</mi> <mo>;</mo> </mrow><mrow> <mfrac> <mrow> <mn>2</mn> <msub> <mi>C</mi> <mi>e</mi> </msub> </mrow> <mrow> <msub> <mi>A</mi> <mi>x</mi> </msub> <mi>m</mi> <mi>a</mi> <mi>&omega;</mi> </mrow> </mfrac> <mo><</mo> <mn>1.</mn> </mrow>
- 4. the electromagnetic type power generator based on body kinetic energy as described in claim 1, which is characterized in that the generator is opened The relation of the value of road electromotive force and the effective length of coil is：<mrow> <msub> <mi>V</mi> <mrow> <mi>T</mi> <mi>e</mi> <mi>m</mi> </mrow> </msub> <mo>=</mo> <mn>3</mn> <msub> <mi>Bl</mi> <mrow> <mi>e</mi> <mi>f</mi> <mi>f</mi> </mrow> </msub> <msub> <mi>l</mi> <mi>r</mi> </msub> <mover> <mi>&theta;</mi> <mo>&CenterDot;</mo> </mover> <mo>;</mo> </mrow><mrow> <msub> <mi>l</mi> <mrow> <mi>e</mi> <mi>f</mi> <mi>f</mi> </mrow> </msub> <mo>=</mo> <mfrac> <msub> <mi>l</mi> <mi>w</mi> </msub> <mi>&pi;</mi> </mfrac> <mo>;</mo> </mrow>In formula：VTemFor generator output open-circuit voltage, B be coil effective length position remnant field, leffFor line The effective length of circle, lrFor the radius of rotor, lwFor the physical length of coil；The total length of coil spiral is about：<mrow> <msub> <mi>l</mi> <mi>w</mi> </msub> <mo>=</mo> <msub> <mi>&pi;N</mi> <mi>T</mi> </msub> <mfrac> <mrow> <msub> <mi>D</mi> <mn>0</mn> </msub> <mo>+</mo> <msub> <mi>D</mi> <mi>i</mi> </msub> </mrow> <mn>2</mn> </mfrac> <mo>;</mo> </mrow>In formula, NTFor coil total number of turns, it is defined as every layer of coil turn and is multiplied by the coil number of plies, D0For the outer diameter of coil, DiFor The internal diameter of coil；Magnetic field at magnet z is calculated as：<mrow> <msub> <mi>B</mi> <mi>z</mi> </msub> <mo>=</mo> <mfrac> <mi>B</mi> <mn>2</mn> </mfrac> <mrow> <mo>(</mo> <mfrac> <mrow> <msub> <mi>t</mi> <mi>m</mi> </msub> <mo>+</mo> <mi>z</mi> </mrow> <msqrt> <mrow> <msubsup> <mi>r</mi> <mn>1</mn> <mn>2</mn> </msubsup> <mo>+</mo> <msup> <mrow> <mo>(</mo> <msub> <mi>t</mi> <mi>m</mi> </msub> <mo>+</mo> <mi>z</mi> <mo>)</mo> </mrow> <mn>2</mn> </msup> </mrow> </msqrt> </mfrac> <mo>-</mo> <mfrac> <mi>z</mi> <msqrt> <mrow> <msubsup> <mi>r</mi> <mn>1</mn> <mn>2</mn> </msubsup> <mo>+</mo> <msup> <mi>z</mi> <mn>2</mn> </msup> </mrow> </msqrt> </mfrac> <mo>)</mo> </mrow> <mo>;</mo> </mrow>T in formulamRepresent the thickness of magnet, r1Represent the radius of magnet.
- 5. the electromagnetic type power generator based on body kinetic energy as described in claim 1, which is characterized in that be transferred to load resistance Power be expressed as：<mrow> <msub> <mi>P</mi> <mrow> <mi>T</mi> <mi>e</mi> <mi>m</mi> </mrow> </msub> <mo>=</mo> <mfrac> <msup> <mrow> <mo>&lsqb;</mo> <mrow> <mo>(</mo> <mfrac> <msub> <mi>R</mi> <mi>L</mi> </msub> <mrow> <msub> <mi>R</mi> <mi>L</mi> </msub> <mo>+</mo> <msub> <mi>R</mi> <mrow> <mi>T</mi> <mi>int</mi> </mrow> </msub> </mrow> </mfrac> <mo>)</mo> </mrow> <msub> <mi>V</mi> <mrow> <mi>T</mi> <mi>e</mi> <mi>m</mi> </mrow> </msub> <mo>&rsqb;</mo> </mrow> <mn>2</mn> </msup> <msub> <mi>R</mi> <mi>L</mi> </msub> </mfrac> <mo>;</mo> </mrow>In formula, RLRepresent generator external load resistance, RTintRepresent the resistance of generator coil；Generator coil resistance is acquired by the resistance formula calculating of conducting wire：<mrow> <msub> <mi>R</mi> <mrow> <mi>T</mi> <mi>int</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>N</mi> <mi>c</mi> </msub> <mfrac> <mrow> <msub> <mi>&rho;l</mi> <mi>w</mi> </msub> </mrow> <mi>A</mi> </mfrac> <mo>;</mo> </mrow>Wherein, ρ be winding wire resistivity, lwFor winding wire length, NcRepresent number of coils, A is the cross section of conducting wire Product；Electromagnetic damping is expressed as：<mrow> <msub> <mi>C</mi> <mi>e</mi> </msub> <mo>=</mo> <mfrac> <msup> <mrow> <mo>(</mo> <msub> <mi>Bl</mi> <mrow> <mi>e</mi> <mi>f</mi> <mi>f</mi> </mrow> </msub> <msub> <mi>l</mi> <mi>r</mi> </msub> <mo>)</mo> </mrow> <mn>2</mn> </msup> <mrow> <msub> <mi>R</mi> <mi>L</mi> </msub> <mo>+</mo> <msub> <mi>R</mi> <mrow> <mi>T</mi> <mi>int</mi> </mrow> </msub> </mrow> </mfrac> <mo>;</mo> </mrow>The electromagnetic damping of generator depends on the load resistance of kinetic energy harvester, and is inversely proportional with load resistance.
- 6. a kind of electromagnetic type power generator based on body kinetic energy as described in claim 1, which is characterized in that described to be based on human body The stator permanent magnet of the electromagnetic type power generator of kinetic energy is embedded in stator base, arrangement rotor pedestal above stator permanent magnet, Damascene wiring iron core on rotor pedestal, wound coil winding on iron-core coil.
- 7. the electromagnetic type power generator based on body kinetic energy as claimed in claim 6, which is characterized in that described to be moved based on human body Can electromagnetic type power generator comprehensive selection and design its basic size centered on 120 degree of angle, rotor radius 50mm, be highly 20mm, rotor form single-phase defeated by four groups of a diameter of 0.15mm copper conductors and with orthogonal ring winding mode around head and the tail series connection Go out.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108734891A (en) * | 2018-06-15 | 2018-11-02 | 陈培高 | A kind of medical apparatus applied to medical system |
| CN108734891B (en) * | 2018-06-15 | 2021-02-05 | 李爱红 | Medical instrument applied to medical system |
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