CN104993605A - Circuit compensation network of non-contact power supply ultrasonic vibration system based on efficiency - Google Patents

Abstract

The invention discloses a circuit compensation network of a non-contact power supply ultrasonic vibration system for realizing maximum transmission efficiency. The circuit compensation network comprises a primary compensation network and a secondary compensation network. The primary compensation network is connected between an ultrasonic power supply and a primary coil of a non-contact electromagnetic coupler to compensate reactive power of the system and make voltage and current output by the power supply in phase. The secondary compensation network is connected between a secondary coil of the non-contact electromagnetic coupler and an ultrasonic vibrator to realize highest-efficiency energy transmission by optimizing the parameters of a secondary compensation element(s), wherein the compensation element(s) is/are an inductor or/and a capacitor. The circuit compensation network of the invention can be applied to rotary ultrasonic machining, ultrasonic welding, and other occasions in which a non-contact electromagnetic coupler needs to be adopted to supply power to an ultrasonic vibrator. Highest-efficiency energy transmission is realized by optimizing the parameters of the secondary compensation element(s).

Description

Based on the circuit compensation network of the non-contact power ultrasonic vibration system of efficiency

Technical field

The present invention relates to a kind of noncontact rotary electromagnetic coupler that adopts is the technology that ultrasonic transducer is powered, particularly a kind of circuit compensation method of seeking the maximum transmitted efficiency realizing this noncontact energy transmission system.

Background technology

Rotary ultrasonic ripple processing and utilization consolidation formula diamond tool (plating formula or sintered type diamond tool) does ultrasonic vibration, and the mode of High Rotation Speed is processed simultaneously.Be widely used in the processing of hard brittle material as engineering ceramics, composite material, titanium alloy etc., the processing of rotary ultrasonic ripple effectively can improve material removing rate, improves workpiece surface quality and extend cutter life.The supply power mode of traditional rotary ultrasonic ripple lathe many employings electric brush slip ring.The supply power mode of this contact easily produces spark and wearing and tearing, can not be used in inflammable and explosive adverse circumstances, and restricted to the speed of mainshaft.Non-contact rotary electromagnetic coupler can address these problems well, and is widely used in rotary ultrasonic apparatus.If publication number is CN101213042A, publication date is that the Chinese patent application on July 2nd, 2008 discloses one " ultrasonic machining spindle device ", and adopting without core structure is that ultrasonic transducer is powered.For another example notification number is CN102151867B, and the day for announcing is disclose in the Chinese invention patent on May 29th, 2013 " a kind of rotary ultrasonic wave head based on machine tool accessories ", and the cylinder coupling rotary electromagnetic coupler adopting secondary monocycle magnetic core is that transducer is powered.For another example, publication number is CN1324713A, and publication date is that the Chinese patent application in December 5 calendar year 2001 discloses one " having the toolroom machine of supersonic adaptor ", and the rotary electromagnetic coupler adopting circular U-shaped concentric magnetic core cylinder induction is that transducer is powered.

Non-contact rotary electromagnetic coupler also also exists some shortcomings.Contain partial air path owing to existing between the magnetic core of major-minor limit in gap and magnetic circuit, make noncontact rotary electromagnetic coupler there is larger leakage flux.The energy that leakage flux makes primary coil launch can not be absorbed by secondary coil completely, and some is stored in coupler inside, not only limit its power delivery capabilities, and adds own loss.The load of rotary electromagnetic coupler is ultrasonic vibration system (transducer, ultrasonic transformer and instrument), ultrasonic vibration system need work in its resonance frequency place could obtain maximum transformation efficiency and amplitude, transducer shows as a capacitive element but not purely resistive at its resonance frequency place, this will inevitably consume a large amount of reactive powers, reduces system power factor and efficiency of transmission.Address these problems and must increase compensating element, and inductance or electric capacity, with the reactive power of bucking-out system, improve power delivery performance.Notification number is CN201393181Y, the day for announcing is disclose " rotary type non-contact ultrasonic electric signal transmission device " in the Chinese utility model patent on January 27th, 2010, comprise shell, former limit magnetic core coil, secondary magnetic core coil and driving shaft, shell is fixedly connected with formation stationary part with the magnetic core excircle of former limit magnetic core coil, secondary magnetic core coil and driving shaft connect and compose rotor portion, have certain interval between former limit magnetic core coil and secondary magnetic core coil.The magnetic core of described former limit magnetic core coil and secondary magnetic core coil is coaxially arranged.The rotary electromagnetic coupler adopting the induction of can-like magnetic core end face or circular U-shaped concentric magnetic core cylinder induction is that transducer is powered, the wherein monolateral compensation of main limit circuit, secondary makes itself and transducer capacitance resonance improve the efficiency of transmission of system by optimizing self-induction of loop (i.e. coil turn), main limit with the reactive power of bucking-out system, makes electric power output voltage current in phase position by compensating inductance electric capacity.But monolateral compensation is owing to defining coupler secondary self-inductance, the design of coupler is made to have limitation, all ultrasonic vibrators can not be applicable to, therefore secondary also needs to increase compensating element, Optimization Compensation component value and secondary self-induction are to realize the transmission of optimum efficiency simultaneously, bilateral Compensation Design is more flexible, is more suitable for production practices.

Summary of the invention

For problems of the prior art, the invention provides a kind of circuit compensation network of the non-contact power ultrasonic vibration system based on efficiency, mentality of designing of the present invention is based on secondary series inductance or the basic bilateral compensation topology of electric capacity, secondary shunt inductance or electric capacity two kinds, adopt the compensating form of main limit and secondary compensating inductance and/or electric capacity simultaneously, wherein, main limit circuit compensation network is used for the reactive power of offset supply, make electric power output voltage current in phase position, secondary circuit compensating network is used for realizing maximum efficiency of transmission.

In order to solve the problems of the technologies described above, the circuit compensation network of a kind of non-contact power ultrasonic vibration system based on efficiency that the present invention proposes, non-contact power ultrasonic vibration system wherein comprises non-contact electromagnetic coupler, described non-contact electromagnetic coupler comprises the main limit magnetic core and secondary magnetic core that have gap each other, described main limit magnetic core is wound with main sideline circle, described secondary magnetic core is wound with secondary coil, described main sideline circle is connected with main limit compensating network, described secondary coil is connected with the secondary compensating network be made up of compensating element, ultrasonic-frequency power supply produces supersonic frequency alternating current, main sideline circle is given by electrical energy transfer through described main limit compensating network, described secondary coil is transferred to again by electromagnetic induction principle, ultrasonic electric energy is transferred to ultrasonic transducer by described secondary compensating network, the microvibration that ultrasonic transducer is produced by inverse piezoelectric effect is amplified vibration transmission oscillator after amplitude through ultrasonic transformer.

Further, the present invention is based on the circuit compensation network of the non-contact power ultrasonic vibration system of efficiency, wherein:

Described secondary compensating network is made up of the compensating element, of connecting with secondary coil, and described compensating element, is inductance or electric capacity, and the reactance of its compensating element, meets following formula:

X _s＝-ωL _s-X _t

Wherein: the reactance of Xs-secondary series compensation element, Ls-secondary coil self-induction, Xt-ultrasonic vibrator equivalent reactance, the angular frequency of ω-power output signal.

Described secondary compensating network is made up of the compensating element, in parallel with secondary coil, and described compensating element, is inductance or electric capacity, and the susceptance of its compensating element, meets following formula:

$B_s=\frac{R_p{\mathrm{\ωL}}_s}{R_p{R}_s^2+{\mathrm{\ω}}^2{M}^2{R}_s+R_p{\mathrm{\ω}}^2{L}_s^2}+\frac{X_t}{R_t^2\×X_t^2}$

Wherein: wherein: the susceptance of Bs-secondary shunt compensation element, the angular frequency of ω-power output signal, Rp-main sideline circle AC resistance, Rs-secondary coil AC resistance, Ls-secondary coil self-induction, M-mutual inductance, Xt-ultrasonic vibrator equivalent reactance, Rt-ultrasonic vibrator equivalent resistance.

Compared with prior art, the invention has the beneficial effects as follows:

Because circuit compensation network of the present invention is derived based on electromagnetic coupled mutual inductance coupling model, only be concerned about the parameters such as the mutual inductance of non-contact electromagnetic coupler and self-induction, and have nothing to do with the actual physical structure size of coupler, therefore, go for the non-contact electromagnetic coupler of various different structure size, various different noncontact rotary electromagnetic coupler as shown in Figure 2.

Secondly, circuit compensation network of the present invention is in derivation, only be concerned about equivalent resistance Rt and equivalent reactance Xt two parameters of ultrasonic vibrator, and do not relate to the physical structure size of ultrasonic vibrator, therefore, go for the ultrasonic vibration system of the non-contact power of various occasion, be not only confined to the ultrasonic vibrator structure shown in Fig. 1.

In circuit compensation network of the present invention, main limit compensating network is the reactive power in order to bucking-out system, and make electric power output voltage current in phase position, its structure is unrestricted, as long as the compensating network possessing this function is just passable.

Accompanying drawing explanation

The Energy Transfer schematic diagram of Fig. 1 non-contact power ultrasonic wave process unit;

The noncontact rotary electromagnetic coupler of Fig. 2 different structure form; Wherein (a) is U-shaped concentric magnetic core cylinder induction coil version, b () is upper and lower can-like magnetic core cylinder induction coil version, c () is upper and lower can-like magnetic core end face induction coil version, d () is secondary monocycle magnetic core cylinder induction coil version, (e) is without magnetic core cylinder induction coil version.

Fig. 3 is the equivalent-circuit model of Fig. 1;

Fig. 4 is the reduced form of cross high cumulant shown in Fig. 3;

Fig. 5 bilateral compensation topology-secondary series compensation;

Fig. 6 bilateral compensation topology-secondary shunt compensation;

Fig. 7 coupler winding mode and core structure schematic diagram;

The main limit self-induction of loop of Fig. 8 experiment measuring and the relation of coil turn;

The secondary coil self-induction of Fig. 9 experiment measuring and the relation of coil turn;

The relation of Figure 10 experiment measuring major-minor limit AC resistance and coil turn;

Figure 11 coil and Litz line schematic diagram;

The efficiency of transmission of Figure 12 secondary series compensation and the relation of coil turn;

The efficiency of transmission of Figure 13 secondary shunt compensation and the relation of coil turn.

In figure:

1-ultrasonic-frequency power supply 2-main limit compensating network

3-main sideline circle 4-secondary coil

5-secondary magnetic core 6-main limit magnetic core

7-secondary compensating network 8-transducer

9-ultrasonic transformer 10-cutter

Gap Ui-supply voltage between the magnetic core of g-major and minor limit

Ii-source current Rp-main sideline circle AC resistance

The main winding current of Lp-main limit self-induction of loop Ip-

M-mutual inductance Rs-secondary coil AC resistance

Ls-secondary coil self-induction Is-secondary coil electric current

It-transducer current R0-piezoelectric ceramic static resistance

C0-piezoelectric ceramic direct capacitance L1-ultrasonic vibrator dynamic inductance

C1-ultrasonic vibrator dynamic capacity R1-ultrasonic vibrator dynamic electric resistor

The equivalent mechanical load resistance Zt-ultrasonic vibrator equiva lent impedance of RL-ultrasonic vibrator

Rt-ultrasonic vibrator equivalent resistance Xt-ultrasonic vibrator equivalent reactance

The susceptance of the reactance Bs-secondary shunt compensation element of Xs-secondary series compensation element

Embodiment

Be described in further detail technical solution of the present invention below in conjunction with the drawings and specific embodiments, described specific embodiment only explains the present invention, not in order to limit the present invention.

As shown in Figure 1, the circuit compensation network of a kind of non-contact power ultrasonic vibration system based on efficiency of the present invention, non-contact power ultrasonic vibration system wherein comprises non-contact electromagnetic coupler, described non-contact electromagnetic coupler comprises the main limit magnetic core 6 and secondary magnetic core 5 that have gap g each other, described main limit magnetic core 6 is wound with main sideline circle 3, described secondary magnetic core 5 is wound with secondary coil 4, described main sideline circle 3 is connected with main limit compensating network 2, it is characterized in that, described secondary coil 4 is connected with the secondary compensating network 7 be made up of compensating element, ultrasonic-frequency power supply 1 produces supersonic frequency alternating current, main sideline circle 3 is given by electrical energy transfer through described main limit compensating network 2, described secondary coil 4 is transferred to again by electromagnetic induction principle, ultrasonic electric energy is transferred to ultrasonic transducer by described secondary compensating network 7, the microvibration that ultrasonic transducer 8 is produced by inverse piezoelectric effect to be amplified vibration transmission after amplitude to ultrasonic vibrator through ultrasonic transformer 9.

Because circuit compensation network of the present invention is derived based on electromagnetic coupled mutual inductance coupling model, only be concerned about the parameters such as the mutual inductance of non-contact electromagnetic coupler and self-induction, and have nothing to do with the actual physical structure size of coupler, therefore, go for the non-contact electromagnetic coupler of various different structure size, various different noncontact rotary electromagnetic coupler as shown in Figure 2.

The equiva lent impedance of piezoelectric ultrasonic vibrator

Be illustrated in figure 3 the equivalent-circuit model of Fig. 1.Piezoelectric ceramic static resistance R ₀very large, be usually left in the basket.L ₁, C ₁and R ₁represent the quality of ultrasonic vibrator, rigidity and damping respectively.The equiva lent impedance of ultrasonic vibrator can represent with formula (1)-(5), and therefore Fig. 3 can be simplified to shown in Fig. 4.

$Z_t=\frac{1}{{\mathrm{\ω}}^2{C}_0^2}\·\frac{R_m}{R_m^2+{({\mathrm{\ωL}}_1-1/\mathrm{\ωC})}^2}-j[\frac{1}{\mathrm{\ω}{C}_0}+\frac{1}{{\mathrm{\ω}}^2{C}_0^2}\·\frac{{\mathrm{\ωL}}_1-1/\mathrm{\ωC}}{R_m^2+{(\mathrm{\ω}{L}_1-1/\mathrm{\ωC})}^2}]---\left(1\right)$

$C=\frac{C_0{C}_1}{C_0+C_1}---\left(2\right)$

R _m＝R ₁+R _L(3)

$R_t=\frac{1}{{\mathrm{\ω}}^2{C}_0^2}\·\frac{R_m}{R_m^2+{({\mathrm{\ωL}}_1-1/\mathrm{\ωC})}^2}---\left(4\right)$

$X_t=-[\frac{1}{\mathrm{\ω}{C}_0}+\frac{1}{{\mathrm{\ω}}^2{C}_0^2}\·\frac{{\mathrm{\ωL}}_1-1/\mathrm{\ωC}}{R_m^2+{({\mathrm{\ωL}}_1-1/\mathrm{\ωC})}^2}]---\left(5\right)$

In order to obtain maximum electroacoustic transformation efficiency and amplitude, ultrasonic vibrator is generally operational in its mechanical resonant frequency place (ω _s):

${\mathrm{\ω}}_s=1/\sqrt{L_1{C}_1}---\left(6\right)$

Bring formula (6) into formula (4) and (5), equivalent resistance and the reactance of ultrasonic vibrator under resonance frequency can be obtained:

$\left\{\begin{array}{c}{R}_t=\frac{R_m}{{\mathrm{\ω}}_s^2{C}_0^2{R}_m^2+1}\\ X_t=-\frac{{\mathrm{\ω}}_s{C}_0{R}_m^2}{{\mathrm{\ω}}_s^2{C}_0^2{R}_m^2+1}\end{array}\right.---\left(7\right)$

(1) secondary series compensation

Described secondary compensating network 7 is made up of the compensating element, of connecting with secondary coil 4, and described compensating element, is inductance or electric capacity, is illustrated in figure 5 the equivalent circuit diagram of secondary series compensation network.

Secondary circuit can represent with reflected umpedance Zr the effect on main limit, and the power that reflected umpedance Zr obtains is exactly the power that main limit is transferred to secondary.The real part of reflected umpedance is the active power that reflected resistance Rr represents that main limit is transferred to secondary, and the imaginary part of reflected umpedance is the reactive power that reflected reactance Xr represents that main limit is transferred to secondary.

The impedance Z of secondary circuit _scan be defined as

Z _s＝R _s+R _t+j(ωL _s+X _s+X _t) (8)

The expression formula of reflected umpedance is

$Z_r=\frac{{\mathrm{\ω}}^2{M}^2}{Z_s}---\left(9\right)$

Bring formula (8) into formula (9) can obtain

$\left\{\begin{array}{c}{R}_r=\frac{{\mathrm{\ω}}^2{M}^2(R_s+R_t)}{{(R_s+R_t)}^2+{(\mathrm{\ω}{L}_s+X_t+X_s)}^2}\\ X_r=-\frac{{\mathrm{\ω}}^2{M}^2(\mathrm{\ω}{L}_s+X_t+X_s)}{{(R_s+R_t)}^2+{(\mathrm{\ω}{L}_s+X_t+X_s)}^2}\end{array}\right.---\left(10\right)$

The power transmission efficiency of non-contact electromagnetic coupler is

${\mathrm{\η}}_{\mathrm{transf}}={\mathrm{\η}}_p\×{\mathrm{\η}}_s=\frac{R_r}{R_r+R_p}\×\frac{R_t}{R_s+R_t}---\left(11\right)$

Bring formula (10) into formula (11) can obtain

${\mathrm{\η}}_{\mathrm{transf}}=\frac{{\mathrm{\ω}}^2{M}^2{R}_t}{R_p{(R_s+R_t)}^2+R_p{({\mathrm{\ωL}}_s+X_t+X_s)}^2+{\mathrm{\ω}}^2{M}^2(R_s+R_t)}---\left(12\right)$

Order

$\frac{d{\mathrm{\η}}_{\mathrm{transf}}}{{\mathrm{dX}}_s}=0---\left(13\right)$

Can obtain

X _s＝-ωL _s-X _t(14)

Wherein: the reactance of Xs-secondary series compensation element, Ls-secondary coil self-induction, Xt-ultrasonic vibrator equivalent reactance, the angular frequency of ω-power output signal.

When the reactance value Xs of secondary series compensation element meets formula (14), be the optimum secondary series compensation element reactive realizing maximum transmitted efficiency, compensating element, may be inductance or electric capacity this to be determined by final result of calculation.X _s=ω L or-1/ ω C, wherein L and C is inductance value and the capacitance of series compensation element respectively.

(2) secondary shunt compensation

Described secondary compensating network 7 is made up of the compensating element, in parallel with secondary coil 4, and described compensating element, is inductance or electric capacity, is illustrated in figure 6 the equivalent circuit diagram of secondary shunt compensation network.

Impedance (the Z of secondary circuit _s) can be defined as

$Z_s=R_s+j{\mathrm{\ωL}}_s+\frac{1}{{\mathrm{jB}}_s+\frac{1}{R_t+j{X}_t}}---\left(15\right)$

Bring formula (15) into formula (9) can obtain

$\left\{\begin{array}{c}{R}_r=\frac{{\mathrm{\ω}}^2{M}^2[R_t+{(1-B_s{X}_t)}^2{R}_s+B_s^2{R}_t^2{R}_s]}{{[R_t(1-{\mathrm{\ωL}}_s{B}_s)+(1-B_s{X}_t)R_s]}^2+{[\mathrm{\ω}{L}_s+X_t(1-{\mathrm{\ωL}}_s{B}_s)+B_s{R}_t{R}_s]}^2}\\ X_r=\frac{{\mathrm{\ω}}^2{M}^2[(R_t^2+X_t^2)(1-\mathrm{\ω}{L}_s{B}_s)B_s-X_t-{\mathrm{\ωL}}_s+2{\mathrm{\ωL}}_s{X}_t{B}_s]}{{[R_t(1-{\mathrm{\ωL}}_s{B}_s)+(1-B_s{X}_t)R_s]}^2+{[\mathrm{\ω}{L}_s+X_t(1-{\mathrm{\ωL}}_s{B}_s)+B_s{R}_t{R}_s]}^2}\end{array}\right.---\left(16\right)$

The power transmission efficiency of non-contact electromagnetic coupler is

${\mathrm{\η}}_{\mathrm{transf}}={\mathrm{\η}}_p\×{\mathrm{\η}}_s=\frac{R_r}{R_p+R_r}\×\frac{R_t}{R_s[{(X_t{B}_s-1)}^2+R_t^2{B}_s^2]+R_t}---\left(17\right)$

Bring formula (16) into formula (17) can obtain

${\mathrm{\η}}_{\mathrm{transf}}=\frac{{\mathrm{\ω}}^2{M}^2{R}_t}{\left\{\begin{array}{c}{R}_p{[R_t(1-{\mathrm{\ωL}}_s{B}_s)+(1-B_s{X}_t)R_s]}^2\\ +R_p{[{\mathrm{\ωL}}_s+X_t(1-{\mathrm{\ωL}}_s{B}_s)+B_s{R}_t{R}_s]}^2\\ +{\mathrm{\ω}}^2{M}^2[R_t+{(1-B_s{X}_t)}^2{R}_s+B_s^2{R}_t^2{R}_s]\end{array}\right\}}---\left(18\right)$

Order

$\frac{d{\mathrm{\η}}_{\mathrm{transf}}}{{\mathrm{dB}}_s}=0---\left(19\right)$

Can obtain

$B_s=\frac{R_p{\mathrm{\ωL}}_s}{R_p{R}_s^2+{\mathrm{\ω}}^2{M}^2{R}_s+R_p{\mathrm{\ω}}^2{L}_s^2}+\frac{X_t}{R_t^2+X_t^2}---\left(20\right)$

Wherein: the susceptance of Bs-secondary shunt compensation element, the angular frequency of ω-power output signal, Rp-main sideline circle AC resistance, Rs-secondary coil AC resistance, Ls-secondary coil self-induction, M-mutual inductance, Xt-ultrasonic vibrator equivalent reactance, Rt-ultrasonic vibrator equivalent resistance.

When the susceptance value Bs of secondary shunt compensation element meets formula (20), be the optimum secondary shunt compensation element susceptance realizing maximum transmitted efficiency, compensating element, may be inductance or electric capacity this to be determined by final result of calculation.B _s=ω C or-1/ ω L, wherein L and C is inductance value and the capacitance of shunt compensation element respectively.

Embodiment:

Below for concentric magnetic core cylinder inductive electromagnetic coupler U-shaped shown in Fig. 7, the concrete grammar that compensating element, and coil are optimized is described, this non-contact electromagnetic coupler adopts manganese-zinc ferrite PC40 material, and dimensional parameters is in table 1, and transducer electrical parameter used is in table 2.Coupler coil self-induction measured by experiment and the relation of AC resistance and coil turn are shown in Fig. 8-10, and between coil, coupling coefficient k is in table 3.

The dimensional parameters (mm) of table 1U type concentric magnetic core cylinder inductive electromagnetic coupler

d1	d2	d3	d4	H	a	b	g
								65	82	84	101	25	18	4	1

Table 2 ultrasonic vibrator electrical parameter

C 0[nF]	C 1[nF]	L 1[mH]	R 1[Ω]	R L[Ω]	f s[KHz]
						6.693846	1.180532	22.964342	16.285	0	30.567

The relation of table 3 coupling coefficient k and coil turn

Visible, when adopting outer winding mode, when namely keeping the gap between main and sub-coil constant, the coupling coefficient of coupler also remains unchanged substantially, is about 0.975.Therefore following self-induction of loop and the relation formula between AC resistance and coil turn can be simulated according to experimental measurements

$\left\{\begin{array}{c}{L}_p=1.0402N_p^{1.9986}\\ L_s=1.0006N_s^{2.0044}\end{array}\right.---\left(21\right)$

$\left\{\begin{array}{c}{R}_p=0.0214N_p^{1.1269}\\ R_s=0.0201N_s^{1.1197}\end{array}\right.---\left(22\right)$

The computing formula of coupler mutual inductance is shown in (23)

$M=k\×\sqrt{L_p{L}_s}---\left(23\right)$

(21) are brought into (23) and just establish relational expression between mutual inductance and coil turn, wherein, k gets 0.975, electromagnetic coupler parameter involved in such Fig. 5 and Fig. 6 just can be expressed with coil turn, and the efficiency of transmission of formula (12) and (18) just can be converted into the function of coil turn.

Except experiment measuring method, also obtain coupler self-induction, mutual inductance and the relation between AC resistance and coil turn by theory calculate.Theoretical method is based on following formula:

$L_p=\frac{N_p^2}{R_{\mathrm{mp}}}---\left(24\right)$

$L_s=\frac{N_s^2}{R_{\mathrm{ms}}}---\left(25\right)$

$k=\frac{{\mathrm{\φ}}_M}{{\mathrm{\φ}}_M+{\mathrm{\φ}}_L}---\left(26\right)$

$R_{\mathrm{ac}}=R_{\mathrm{dc}}[1+2{\left(\frac{n_{\mathrm{str}}{d}_{\mathrm{str}}}{D_{\mathrm{Litz}}}\right)}^2[\frac{d_{\mathrm{str}}\sqrt{f_s}}{0.1044}\left]\right]---\left(27\right)$

Wherein: Np-main limit coil turn, the Ns-secondary coil number of turn, Rmp-main limit magnetic circuit reluctance, Rms-subsidiary magnetic route magnetic resistance, the coupling coefficient between k-major-minor limit, φ _m-couples magnetic flux, φ _l-leakage flux, R _ac-coil AC resistance, R _dc-coil D.C. resistance, n _strthe number of single, thin in-Litz line, d _strthe diameter (see Figure 11) of-single, thin, D _litztotal external diameter (see Figure 11) of-Litz line, f _stransducer series resonance frequency.

The magnetic resistance of magnetic circuit and the coupling coefficient method in paper " magnetic circuit model of novel non-contact transformer and the optimization thereof " literary composition delivered of " Proceedings of the CSEE " the 30th volume the 27th phase of can copying calculates.

Optimal compensation parameter (formula 14 and 20) based on efficiency is brought into expression formula (12) and (18) of efficiency of transmission, namely no matter how many coil turns is for remaining that compensating element, is optimal value.Meanwhile, formula (21) (22) (23) are treated the expression formula (12) into defeated efficiency and (18), just can obtain the relation of efficiency of transmission and coil turn.As shown in Figure 12 and Figure 13.

If the efficiency of transmission of designing requirement coupler is more than 0.98, so get in Figure 12 and Figure 13, the region that 0.98 contour surrounds, have many group major-minor limits number of turn to meet the demands, the design of such coupler can more flexibly and be easy to realize.

As the electromagnetic coupler number of turn is designed to Ns=8, Np=60, i.e. Ls=64.627 μ H, Lp=3.7mH, M=478.27 μ H.

Secondary series compensation capacitance 431.33nF, efficiency is 0.9833.

Secondary Shunt compensation capacitor 60.611nF, efficiency is 0.9817.

Comparative example

Notification number is CN201393181Y, and the day for announcing is that in the Chinese utility model patent " rotary type non-contact ultrasonic electric signal transmission device " on January 27th, 2010, the compensation condition of secondary is:

$L_s=\frac{C_0{R}_1^2}{({\mathrm{\ω}}_s^2{C}_0^2{R}_1^2+1)}---\left(28\right)$

For transducer shown in table 2, can obtain Ls=1.7744 μ H, so can calculate the secondary coil number of turn according to formula (19) is

Visible coupler adopts core structure to be difficult to obtain so little self-induction.According to " calculating of single-turn circular coil inductance " of " Inner Mongol Normal University journal natural science (Chinese) version " volume the 1st phase March the 28th in 1999, known for single turn air core coil when its radius is 38mm, self-induction is about 1.7744 μ H.According to the air core coil without magnetic core, leakage flux can be very large, not have closed magnetic circuit, and leakage flux can produce eddy current loss in metal medium around.Except producing larger electromagnetic radiation, coupling coefficient is also lower, and this reduces the efficiency of transmission of coupler on the contrary.Also can be found out by efficiency of transmission computing formula below, it is inadequate for only optimizing secondary self-induction, and efficiency of transmission is also relevant with coefficient of mutual inductance, and coefficient of mutual inductance M is larger, and efficiency of transmission is higher, and lower self-induction can cause lower mutual inductance, can reduce efficiency of transmission on the contrary.

${\mathrm{\η}}_{\mathrm{transf}}=\frac{{\mathrm{\ω}}^2{M}^2{R}_t}{R_p{(R_s+R_t)}^2+{\mathrm{\ω}}^2{M}^2(R_s+R_t)}=\frac{1}{\frac{R_p{(R_s+R_t)}^2}{{\mathrm{\ω}}^2{M}^2{R}_t}+\frac{R_s}{R_t}+1}---\left(29\right)$

Therefore can find out, in this comparative example, secondary self compensation is inapplicable.

Although invention has been described by reference to the accompanying drawings above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; when not departing from present inventive concept, can also make a lot of distortion, these all belong within protection of the present invention.

Claims (5)

1. the circuit compensation network based on the non-contact power ultrasonic vibration system of efficiency, non-contact power ultrasonic vibration system wherein comprises non-contact electromagnetic coupler, described non-contact electromagnetic coupler comprises main limit magnetic core (6) and secondary magnetic core (5) that have gap each other, described main limit magnetic core (6) is wound with main sideline circle (3), described secondary magnetic core (5) is wound with secondary coil (4), described main sideline circle (3) is connected with main limit compensating network (2), it is characterized in that, described secondary coil (4) is connected with the secondary compensating network (7) be made up of compensating element, ultrasonic-frequency power supply (1) produces supersonic frequency alternating current, main sideline circle (3) is given by electrical energy transfer through described main limit compensating network (2), described secondary coil (4) is transferred to again by electromagnetic induction principle, ultrasonic electric energy is transferred to ultrasonic transducer by described secondary compensating network (7), the microvibration that ultrasonic transducer (8) is produced by inverse piezoelectric effect to be amplified vibration transmission after amplitude to ultrasonic vibrator through ultrasonic transformer (9).

2. the circuit compensation network of a kind of non-contact power ultrasonic vibration system based on efficiency according to claim 1, it is characterized in that, described secondary compensating network (7) is made up of the compensating element, of connecting with secondary coil (4), and described compensating element, is inductance or electric capacity.

3. the circuit compensation network of a kind of non-contact power ultrasonic vibration system based on efficiency according to claim 1, it is characterized in that, described secondary compensating network (7) is made up of the compensating element, in parallel with secondary coil (4), and described compensating element, is inductance or electric capacity.

4. the circuit compensation network of a kind of non-contact power ultrasonic vibration system based on efficiency according to claim 2, it is characterized in that, the reactance of compensating element, meets following formula:

X _s＝-ωL _s-X _t

Wherein: the reactance of Xs-secondary series compensation element, Ls-secondary coil self-induction, Xt-ultrasonic vibrator equivalent reactance, the angular frequency of ω-power output signal.

5. the circuit compensation network of a kind of non-contact power ultrasonic vibration system based on efficiency according to claim 3, it is characterized in that, the susceptance of compensating element, meets following formula:

Wherein: the susceptance of Bs-secondary shunt compensation element, the angular frequency of ω-power output signal, Rp-main sideline circle AC resistance, Rs-secondary coil AC resistance, Ls-secondary coil self-induction, M-mutual inductance, Xt-ultrasonic vibrator equivalent reactance, Rt-ultrasonic vibrator equivalent resistance.