Eddy current separator equivalent circuit and eddy current separator

Abstract

Eddy current separator equivalent circuit and eddy current separator, which relate to the field of separators. Aiming at the problem that there is no eddy current separator with the best separation effect from the circuit perspective in the prior art, the technical solution provided by the present invention is as follows: The eddy current separator equivalent circuit includes: resistor R<subgt;1< / subgt>, resistor R<subgt;2', resistor R<subgt;3', resistor R<subgt;m, impedance X<subgt;1σ, impedance X<subgt;2σ', impedance X<subgt;3σ', impedance X<subgt;m, voltage source E<subgt;1', voltage source E<subgt;2 and voltage source E<subgt;3; The two ends of the main circuit are used as the input terminals of the circuit. Resistor R<subgt;1, impedance X<subgt;1σ, resistor R<subgt;2', impedance X<subgt;2σ', resistor R<subgt;3', impedance X<subgt;3σ', voltage source E<subgt;1' and voltage source E<subgt;3 are connected in series on the main circuit; Branch one is connected in parallel with resistor R<subgt;1, impedance X<subgt;1σ and the input terminal. Resistor R<subgt;m and impedance X<subgt;m are connected in series on branch one; Branch two is connected in parallel with resistor R<subgt;3', impedance X<subgt;3σ', voltage source E<subgt;1' and voltage source E<subgt;3. Voltage source E<subgt;2 is arranged on the second main circuit; The output terminal of the parallel circuit of resistor R<subgt;3', impedance X<subgt;3σ' and voltage source E<subgt;1'. It is applicable to the separation work of non-ferrous metal blocks and provides a reference for the research and design of linear motors.

Description

Technical Field

[0001] It relates to the field of sorting machines, specifically to the sorting of non-ferrous metal blocks. Background Art

[0002] Currently, in the field of eddy current sorting machine technology, the equivalent circuit research can give an implementation scheme with the best sorting effect from the circuit perspective. This technology can improve the evaluation system of eddy current sorting machines. Through circuit parameters and combined with the material quantity, the linear segment and arc rotation speed of the eddy current sorting machine can be established, the optimal material quantity can be determined, and the optimal rotation speed can be given.

[0003] Figure 1 For the sorting process of the eddy current sorting machine, the sorted metal in the figure is a copper block. The eddy current sorting machine can also be used to sort other metals. The magnetic roller of the eddy current sorting machine is driven by an asynchronous motor. The conveyor belt speed is v, the angular velocity of the magnetic roller is ω, the permanent magnet distribution on the cross-section of the magnetic roller is alternately distributed with N and S, and half of an adjacent permanent magnet and the other half of an adjacent permanent magnet form a closed loop.

[0004] However, most of the existing eddy current sorting machines in the prior art focus on the sorting paths of different metals, the analysis of the influence of metal shapes on the sorting effect, and the analysis of the radial and tangential forces on the sorting effect. The equivalent circuit analysis of the eddy current sorting machine helps to improve the metal sorting effect and save energy consumption. So far, the equivalent circuit analysis of the eddy current sorting machine has not been proposed in the existing literature. There is no technical solution to establish the equivalent circuit of the eddy current sorting machine by combining the equivalent circuits of the asynchronous motor and the linear motor at the front end of the generator, resulting in a technical gap in the field of sorting machines and a lack of an eddy current sorting machine that gives the best sorting effect from the circuit perspective. Summary of the Invention

[0005] Aiming at the problem that the equivalent circuit analysis of the eddy current sorting machine has not been proposed in the prior art and there is a lack of an eddy current sorting machine that gives the best sorting effect from the circuit perspective in the prior art, the technical solution provided by the present invention is as follows:

[0006] The equivalent circuit of the eddy current sorting machine, the circuit includes: resistor R1, resistor R2', resistor R3', resistor R m , impedance X 1σ , impedance X 2σ ', impedance X 3σ ', impedance X m , voltage source E1', voltage source E2 and voltage source E3;

[0007] The circuit further includes: a main path, a first branch and a second branch;

[0008] Both ends of the main path are used as the input terminals of the circuit, and the resistor R1, impedance X 1σ , resistor R2', impedance X2σ ', resistor R3', impedance X 3σ ', voltage source E1' and voltage source E3;

[0009] The first branch is in parallel with the resistor R1, impedance X 1σ and the input terminal, and the resistor R m and impedance X m ;

[0010] The second branch is in parallel with the resistor R3', impedance X 3σ ', voltage source E1' and voltage source E3, and the voltage source E2 is arranged on the second main path;

[0011] The resistor R3', impedance X 3σ ' and voltage source E1' are in parallel with the output terminal of the circuit.

[0012] For the asynchronous motor, a preferred embodiment is provided, and the resistor R1, resistor R2', resistor R3' and resistor R m are respectively: the resistance of the stator side winding of the asynchronous motor, the resistance of the rotor side winding of the asynchronous motor, the equivalent resistance after reduction of the metal block, and the excitation resistance of the asynchronous motor.

[0013] For the asynchronous motor, a preferred embodiment is provided, and the impedance X 1σ , impedance X 2σ ', impedance X 3σ ' and impedance X m are respectively: the leakage reactance of the stator side winding of the asynchronous motor, the leakage reactance of the rotor side winding of the asynchronous motor, the equivalent leakage reactance after reduction of the metal block, and the excitation reactance of the asynchronous motor.

[0014] For the asynchronous motor, a preferred embodiment is provided, and the voltage source E1' is: the induced electromotive force of the metal block with the frequency reduced to the stator side.

[0015] For the asynchronous motor, a preferred embodiment is provided, and the devices on the main path are successively: resistor R1, impedance X 1σ , resistor R2', impedance X 2σ ', resistor R3', impedance X 3σ ' and voltage source E1' and voltage source E3.

[0016] For the asynchronous motor, a preferred embodiment is provided, and one end of the resistor R m is connected between the impedance X 1σ and resistor R2', and one end of the impedance X m is connected to the resistor R m , and the other end is connected between the voltage source E3 and voltage source E2.

[0017] Based on the same inventive concept, the present invention also provides an eddy current separator, which includes the equivalent circuit of the non-current separator described above.

[0018] To introduce asynchronous operation, a preferred embodiment is provided. The separator further includes: an asynchronous motor, and the asynchronous motor includes a linear motor equivalent circuit;

[0019] The equivalent circuit includes: resistance R4, resistance R s , impedance X 4σ , impedance X 5σ and impedance X m0 ;

[0020] The resistance R4, resistance R s , impedance X 4σ and impedance X 5σ are connected in series on the first main path, and both ends of the first main path are used as the input terminals of the equivalent circuit;

[0021] The impedance X m0 is in parallel with the resistance R s and impedance X 5σ .

[0022] To introduce asynchronous operation, a preferred embodiment is provided. The devices on the first main path are in sequence: resistance R4, resistance R s , impedance X 4σ and impedance X 5σ .

[0023] To introduce asynchronous operation, a preferred embodiment is provided. The resistance R4, resistance R s , impedance X 4σ , impedance X 5σ and impedance X m0 are respectively in sequence: primary winding resistance, secondary resistance referred to the primary, primary leakage reactance, secondary leakage reactance referred to the primary, and magnetizing reactance.

[0024] The eddy current separator provided by the present invention is internally provided with a high-speed rotating permanent magnet roller. Through the high-speed rotating magnet roller, a high-frequency alternating magnetic field is generated below the conveyor belt of the separator. When non-ferrous metals pass through the magnetic field area, eddy currents are generated inside. The interaction between the eddy currents inside the metal block and the magnetic density generates an eddy current force, which separates the non-ferrous metals from the mixed waste. Due to the special structure and principle, this environmental protection electrical equipment is applicable to various occasions for separating non-ferromagnetic metals.

[0025] The equivalent circuit of the eddy current separator provided by the present invention gives an implementation scheme for the best separation effect from the circuit perspective. This scheme improves the evaluation system of the eddy current separator. Through the circuit parameters and combined with the material quantity, the linear segment and arc rotation speeds of the eddy current separator can be determined, the best material quantity can be determined, and the best rotation speed can be given.

[0026] The eddy current separator provided by the present invention can establish the optimal operation mode of the eddy current separator by adjusting the slip ratio when the actual situation of the material restricts the operation of the eddy current separator at any load.

[0027] It is suitable for application in the sorting work of non-ferrous metal blocks and provides a reference for the research and design of linear motors. Description of the Drawings

[0028] Figure 1 It is a schematic diagram of the non-ferrous metal sorting process mentioned in the background art;

[0029] Figure 2 In (a) is a schematic diagram of the electromagnetic field of the linear motor mentioned in Embodiment 1, and (b) is a schematic diagram of the electromagnetic field of the eddy current separator;

[0030] Figure 3 It is a schematic diagram of the block diagram of the equivalent circuit of the eddy current separator mentioned in Embodiment 1;

[0031] Figure 4 It is a schematic diagram of the electro-magnetic-force correspondence relationship mentioned in Embodiment 1;

[0032] Figure 5 In (a) is a schematic diagram of the circuit principle of the equivalent circuit of the linear motor mentioned in Embodiment 1, and (b) is a schematic diagram of the circuit principle of the equivalent circuit of the eddy current separator;

[0033] Figure 6 It is a schematic diagram of the circuit principle of the equivalent circuit of the permanent magnet linear generator mentioned in Embodiment 1;

[0034] Figure 7 It is a schematic diagram of the circuit principle of the integrated equivalent circuit mentioned in Embodiment 1;

[0035] Figure 8 It is a schematic diagram of the efficiency characteristic curve of P2-s2 of the separator mentioned in Embodiment 1;

[0036] Figure 9 It is the s2-power factor efficiency characteristic curve of the separator mentioned in Embodiment 1;

[0037] Figure 10 It is the P2-efficiency efficiency characteristic curve of the separator mentioned in Embodiment 1;

[0038] Figure 11 It is the P2-power factor characteristic of the separator mentioned in Embodiment 1. Detailed Embodiment

[0039] To make the advantages and beneficial effects of the technical solution provided by the present invention more clearly reflected, the technical solution provided by the present invention will now be described in detail with reference to the accompanying drawings. Specifically:

[0040] Embodiment 1. Combining Figures 1-11 To describe this embodiment, this embodiment provides an equivalent circuit of an eddy current separator. The circuit includes: resistor R1, resistor R2', resistor R3', resistor R m , impedance X 1σ , impedance X 2σ ', impedance X 3σ ', impedance X m , voltage source E1', voltage source E2, and voltage source E3;

[0041] The circuit further includes: a main path, a first branch, and a second branch;

[0042] Both ends of the main path serve as the input terminals of the circuit. The resistor R1, impedance X 1σ , resistor R2', impedance X 2σ ', resistor R3', impedance X 3σ ', voltage source E1', and voltage source E3 are connected in series on the main path;

[0043] The first branch is connected in parallel with the resistor R1, impedance X 1σ , and the input terminals. The resistor R m and impedance X m are connected in series on the first branch;

[0044] The second branch is connected in parallel with the resistor R3', impedance X 3σ ', voltage source E1', and voltage source E3. The voltage source E2 is provided on the second main path;

[0045] The resistor R3', impedance X 3σ ', and voltage source E1' are connected in parallel to the output terminal of the circuit.

[0046] Specifically:

[0047] This embodiment combines the equivalent circuit of an asynchronous motor and the equivalent circuit of a permanent magnet linear motor to give a general equivalent circuit of an eddy current separator, explores a feeding and separating material quantity scheme, gives a method for determining the speeds of the linear section and the arc rotation section of the eddy current separator, and finally gives the optimal material quantity and rotational speed ratio.

[0048] A traditional rotating induction motor includes a stator (including a core lamination and a three-phase winding) and a rotor (permanent magnet type, squirrel cage type, wound type, etc.). The stator and rotor of the rotating motor are cut along the radial direction from the center of the rotating shaft, and the circumferential structure of the stator and rotor is pulled into a straight line to form a theoretical model of a linear motor. As Figure 2 (a) shows, after three-phase currents are applied to the three-phase windings of the linear motor, a sinusoidal traveling wave magnetic field is generated in the air gap, and its direction moves along the phase sequence straight line. As Figure 2As shown in (b), different from the linear motor, the magnetic flux density of the magnetic roller of the eddy current separator is generated by the magnetic poles of the permanent magnet, and its magnetic flux density is very similar to that of the linear motor, only containing odd - order sine waveforms, and the magnetic flux density rotates synchronously with the magnetic roller.

[0049] Combined with the analysis of the operating mechanism of the linear motor, the magnetic roller structure of the eddy current separator is driven by an asynchronous motor. Here, it can be understood that there is a cascaded part in the equivalent circuit. The equivalent circuit of the asynchronous motor incorporates the equivalent circuit of the linear motor and has a counter - traction effect. The asynchronous motor drives the eddy current separator, and the equivalent circuit part of the eddy current separator is based on the equivalent circuit theory of the linear motor.

[0050] Under static conditions, the magnetic flux density around the magnetic roller shows a sinusoidal change along the circumference of the magnetic roller. As Figure 2 shown in (b), under the condition that the magnetic roller rotates at an angular velocity ω, the external magnetic flux density of the magnetic roller rotates at an angular velocity λ n ω at a high speed. λ n is related to the number of magnetic poles. As a result, eddy currents are generated in non - ferrous metals. This process can be regarded as an asynchronous motor driving the rotor of a generator. The magnetic roller is the equivalent generator rotor, and the eddy currents generated inside the non - ferrous metals are equivalent to the stator winding currents.

[0051] Figure 3 It is a schematic block diagram of the equivalent circuit of the eddy current separator.

[0052] Based on the efficiency calculation methods of asynchronous and linear induction motors, explore the motor models with the magnetic roller of the eddy current separator as the primary side and the separated metal as the secondary side, and establish an equivalent mathematical model and equivalent circuit for studying the separation mechanism efficiency of the eddy current separator. By calculating and analyzing the equivalent parameters in the model circuit, seek the electromagnetic energy conversion process and conversion efficiency during the separation of non - ferrous metals. Starting from the new circuit theory of the eddy current separator, establish the equivalent circuit of the eddy current separator, and how to adjust the feeding material quantity, conveyor belt, and magnetic roller speed, etc.

[0053] When non - ferrous metals leave the conveyor belt, due to the large distance from the magnetic source, the magnetic flux density around them decreases sharply, and the eddy currents and eddy current forces inside the non - ferrous metals decrease sharply. The specific corresponding relationship is as Figure 4 shown in the electro - magnetic - force correspondence. Only the following three states of non - ferrous metals are considered in the equivalent circuit:

[0054] (1) The vertical component of the eddy current force acting on the non - ferrous metal is less than its own gravity, and the horizontal component of the eddy current force is less than the static friction force between the non - ferrous metal and the conveyor belt. The non - ferrous metal moves uniformly on the conveyor belt and has no relative movement with the conveyor belt;

[0055] (2) The vertical component of the eddy current force acting on the non - ferrous metal is equal to its own gravity, but it still has not left the conveyor belt;

[0056] (3) When the vertical component of the eddy current force on non-ferrous metals is greater than their own gravity, the moment they leave the conveyor belt.

[0057] Compared with the situation where the eddy current force is equal to or slightly greater than the gravity, the electromagnetic force at other positions is small and the force effect is not obvious. In the invention, the equivalent circuit of the eddy current separator should focus on the equivalent circuit of the position near where the eddy current force on the block is equal to its own gravity. The study of this equivalent circuit has great physical significance.

[0058] The external magnetic field of non-ferrous metals is generated by permanent magnets. The movement of the equivalent rotor (magnetic roller) is driven by an asynchronous motor. Based on the characteristic that the permanent magnet device has no excitation circuit, the equivalent circuit model of the permanent magnet eddy current separator has no excitation branch (with Rm and Xm). According to the working principle and electromagnetic coupling relationship of the eddy current separator, the equivalent circuit diagram is drawn as shown in Figure 5 (a) and 5(b).

[0059] The magnetic roller structure of the eddy current separator is driven by this asynchronous motor, and the feeding speed of the feeder is constant. Assuming that non-ferrous metals are evenly distributed in the waste, then it is a constant power load relative to the asynchronous motor. The combination of the magnetic roller of the eddy current separator and non-ferrous metals is approximated as a linear motor model. Each piece of non-ferrous metal in the magnetic field area on the conveyor belt has magnetic coupling with the magnetic roller, which are the primary side of the magnetic roller and the secondary side of non-ferrous metals respectively.

[0060] Figure 5 (b), R m is the excitation resistance of the asynchronous motor, R1 is the resistance of the stator side winding of the asynchronous motor, R2’ is the resistance of the rotor side winding of the asynchronous motor, R3’ is the equivalent resistance after the metal block is reduced, X m is the excitation reactance of the asynchronous motor, X 1σ is the leakage reactance of the stator side winding of the asynchronous motor, X 2σ ’ is the leakage reactance of the rotor side winding of the asynchronous motor, X 3σ ’ is the equivalent leakage reactance after the metal block is reduced, E1’ is the induced electromotive force of the metal block with the frequency reduced to the stator side, c1 is the frequency reduction coefficient on the metal block side, and s2 is the slip rate between the magnetic roller and the metal block.

[0061] Figure 5 (a), R4 is the resistance of the primary winding, R5 is the secondary resistance reduced to the primary, X 4σ is the primary leakage reactance, X m0 is the magnetization reactance, X 5σ is the secondary leakage reactance reduced to the primary. The calculation methods of the above parameters are the same as those of the rotating motor. K r (s) and K x (s) are the correction coefficients of the longitudinal dynamic end effect on the secondary resistance and magnetization reactance respectively; C r (s) and C x(s) are the correction coefficients of the secondary resistance and magnetizing reactance due to the transverse dynamic end effect; K f is the correction coefficient of the secondary resistance due to the skin effect.

[0062] Among them

[0063]

[0064] In the formula, r is the circumferential radius of the magnetic roller, n2 is the rotor speed, n3 is the circumferential movement speed of the metal block with the rotor shaft as the center of the circle, and v is the rotational linear speed of the conveyor belt.

[0065] From Figure 5 the equivalent circuit of (b), it can be seen that the input power input to the motor from the power supply side is

[0066]

[0067] Among them, m1 represents the number of phases, U1 represents the stator input voltage, and I1 represents the stator current.

[0068] A part of the input power is consumed on the resistor R1 and converted into heat energy, and its value is

[0069]

[0070] The total iron loss corresponds to the loss on R m in the equivalent circuit, that is

[0071]

[0072] After removing the stator copper loss and iron loss from the input power, the remaining power is transmitted to the rotor through electromagnetic induction, and these powers are the electromagnetic power P e , and its value is

[0073] P e = P in - p Cu1 - p Fe (6)

[0074] Among them, p Cu1 represents the stator copper loss, and p Fe represents the stator iron loss.

[0075] A part of the electromagnetic power is also consumed on the resistor R2, denoted as P Cu2 , and the remaining power is input to the rotor side to drive the magnetic roller to rotate, denoted as P1.

[0076]

[0077] Among them, I'2 represents the rotor current.

[0078] Input power on the rotor side of the induction motor

[0079] P1 = P in -p Cu1 -p Fe -p Cu2 (8)

[0080] After P1 flows into the magnetic roller side, in the input power P1, there is still a part of the power used to overcome bearing friction and wind friction, and this part is denoted as mechanical loss p Ω , and there is also a part to offset the additional loss p Δ , the part after deducting the mechanical loss and the additional loss is the output power P2, that is

[0081] P2 = P1 - p Δ -p Ω (9)

[0082] ∑p = p Fe +p Cu1 +p Cu2 +p Δ +p Ω (10)

[0083] Among them, ∑p represents the total loss, P2 represents the input power, p Δ represents the additional loss, p Ω represents the mechanical loss, p Cu2 represents the rotor copper loss.

[0084] Then there is

[0085] P2 = P in -∑p = P in -p Fe -p Cu1 -p Cu2 -p Δ -p Ω (11)

[0086] The efficiency of the separator is

[0087]

[0088] For the metal block side, it can be equivalent to a permanent magnet linear generator, and its equivalent circuit is as Figure 6 (a) shown

[0089] If the metal block is equivalent to a metal thin plate, then the magnetic induction intensity generated in the metal block can be calculated by the following formula

[0090]

[0091] Among them, Φ represents the main magnetic flux between the magnetic roller and the metal block, and θ represents the initial phase angle.

[0092] Its effective value is

[0093]

[0094] where B m is the magnetic flux density amplitude, A is the magnetic flux area, and f3 is the frequency of the electric quantity on the metal block side.

[0095] If you want to derive the equivalent circuit of the separator, you need to perform frequency reduction on the electric quantity on the metal block side and reduce it to the stator side frequency f1, as shown in the following formula

[0096]

[0097] where n1 is the rotational speed of the stator rotating magnetic field, n2 is the rotational speed of the rotor, n3 is the rotational speed of the circular motion of the metal block with the rotor shaft as the center, p1 is the number of rotor magnetic poles, p2 is the number of magnetic roller magnetic poles, f1 is the stator side electric quantity frequency, E1’ is the induced electromotive force of the metal block in the magnetic field with a changing frequency of f1, and c1 is the frequency reduction coefficient, where

[0098] From Figure 6 (a), the following formula can be obtained

[0099]

[0100] where I3' represents the current on the metal block side after reduction.

[0101] That is, the equivalent circuit diagram is obtained, as shown in Figure 6 (b). By integrating the equivalent circuit, the equivalent circuit is obtained as shown in Figure 5 (b)

[0102] as shown.

[0103] On the condition of ignoring additional losses such as wind resistance friction of the magnetic roller, analyzing the equivalent circuit shows that P1 can also be expressed as

[0104]

[0105] The mechanical loss p Ω and additional loss p Δ in formula (19) are both fixed values, so P2 ∝ s2 2 .

[0106] The power factor, efficiency, etc. of the separator change with the load condition. Taking a three-phase squirrel-cage asynchronous motor driving a magnetic roller as an example, its working characteristic curve is made. Its rated power is 3kW, rated voltage is 380V, rated speed is 957r / min, and the stator winding is Y-connected.

[0107] Figure 7 、 Figure 8They are the P2-s2 curve and the s2-power factor curve at rated voltage and rated frequency respectively.

[0108] The efficiency of the separator varies with the load condition. Figure 9 It is the P2-η efficiency characteristic curve, which is similar to the efficiency characteristic curve of an induction motor. The maximum efficiency appears near full load.

[0109] The working principle of the separator is that an induction motor drives the load to run. For an induction motor, its power factor is very low when it is no-load, generally not exceeding 0.2. As the load increases, the power factor also increases. When the load reaches near the rated load, the power factor is the highest. If the load continues to increase, the power factor decreases. The maximum value of the power factor appears near full load. The variation curve is as Figure 10 shown.

[0110] It can be seen from each curve that when the separator operates near the rated power, both the power factor and the efficiency are relatively high and more economical. Therefore, an appropriate feed rate should be selected to make the separator work near the rated power, and the appropriate slip rate s2 between the magnetic roller and the metal block can be obtained according to the rated power of the separator. According to Equation (19), if the operation of the eddy current separator at any load is restricted due to the actual situation of the material, the optimal operation mode of the eddy current separator can be established by adjusting the slip rate s2.

[0111] Embodiment 2: This embodiment further limits the equivalent circuit of the eddy current separator provided in Embodiment 1 to an induction motor. The resistance R1, resistance R2', resistance R3' and resistance R m are respectively: the resistance of the stator side winding of the induction motor, the resistance of the rotor side winding of the induction motor, the equivalent resistance after the metal block is reduced, and the excitation resistance of the induction motor.

[0112] Embodiment 3: This embodiment further limits the equivalent circuit of the eddy current separator provided in Embodiment 1 to an induction motor. The impedance X 1σ , impedance X 2σ ', impedance X 3σ ' and impedance X m are respectively: the leakage reactance of the stator side winding of the induction motor, the leakage reactance of the rotor side winding of the induction motor, the equivalent leakage reactance after the metal block is reduced, and the excitation reactance of the induction motor.

[0113] Embodiment 4: This embodiment further limits the equivalent circuit of the eddy current separator provided in Embodiment 1 to an induction motor. The voltage source E1' is: the induced electromotive force of the metal block with the frequency reduced to the stator side.

[0114] Embodiment 5: This embodiment further limits the equivalent circuit of the eddy current separator provided in any one of Embodiments 1 to 4 to an induction motor. The devices on the main circuit are in sequence: resistance R1, impedance X1σ , resistor R2', impedance X 2σ ', resistor R3', impedance X 3σ ', voltage source E1' and voltage source E3.

[0115] Embodiment Six: This embodiment provides an asynchronous limitation to the equivalent circuit of the eddy current separator provided in Embodiment Five. The resistor R m is connected at one end between the impedance X 1σ and the resistor R2'. The impedance X m is connected at one end to the resistor R m , and at the other end between the voltage source E3 and the voltage source E2.

[0116] Embodiment Seven: This embodiment provides an eddy current separator, which includes the equivalent circuit of the non-current separator described above.

[0117] Embodiment Eight: This embodiment provides an asynchronous limitation to the eddy current separator provided in Embodiment Seven. The separator further includes: an asynchronous motor, and the asynchronous motor includes a linear motor equivalent circuit;

[0118] The equivalent circuit includes: resistor R4, resistor R s , impedance X 4σ , impedance X 5σ and impedance X m0 ;

[0119] The resistor R4, resistor R s , impedance X 4σ and impedance X 5σ are connected in series on the first main path, and both ends of the first main path serve as the input terminals of the equivalent circuit;

[0120] The impedance X m0 is in parallel with the resistor R s and impedance X 5σ .

[0121] Embodiment Nine: This embodiment provides an asynchronous limitation to the eddy current separator provided in Embodiment Eight. The components on the first main path are, in sequence: resistor R4, resistor R s , impedance X 4σ and impedance X 5σ .

[0122] Embodiment Ten: This embodiment provides an asynchronous limitation to the eddy current separator provided in any one of Embodiments Seven to Nine. The resistor R4, resistor R s , impedance X 4σ , impedance X 5σ and impedance X m0They are, in sequence: primary winding resistance, secondary resistance referred to the primary, primary leakage reactance, secondary leakage reactance referred to the primary, and magnetizing reactance.

[0123] The above provides a detailed asynchronous description of the technical solutions of the present invention through several specific embodiments to highlight the advantages and beneficial effects of the present invention. However, the above-mentioned several specific embodiments are not used as a limitation to the present invention. Any reasonable improvements and changes to the present invention, reasonable combinations and improvements of the implementation manners, etc., within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. Equivalent circuit of eddy current separator, characterized in that, The circuit includes: resistor R1, resistor R2', resistor R3', resistor R m , impedance X 1σ , impedance X 2σ ', impedance X 3σ ', impedance X m , voltage source E1', voltage source E2, and voltage source E3; The circuit further includes: a main path, a first branch, and a second branch; Both ends of the main path serve as the input terminals of the circuit, and the resistor R1, impedance X are connected in series on the main path 1σ , resistor R2', impedance X 2σ ', resistor R3', impedance X 3σ ', voltage source E1' and voltage source E3; The first branch is in parallel with the resistor R1, the impedance X 1σ and the input terminal, and the resistor R m and the impedance X m are connected in series on the first branch; The second branch is connected in parallel with the resistor R3', the impedance X 3σ ', the voltage source E1' and the voltage source E3, and the voltage source E2 is arranged on the second branch; The resistor R3', impedance X 3σ ' and the voltage source E1' are connected in parallel to the output terminal of the circuit; the resistor R1, resistor R2', resistor R3' and resistor R m are respectively, in sequence: the stator side winding resistance of the asynchronous motor, the rotor side winding resistance of the asynchronous motor, the equivalent resistance after reduction of the metal block, and the excitation resistance of the asynchronous motor; The impedance X 1σ , the impedance X 2σ ', the impedance X 3σ ' and the impedance X m are successively and respectively: the leakage reactance of the stator side winding of the asynchronous motor, the leakage reactance of the rotor side winding of the asynchronous motor, the equivalent leakage reactance after reduction of the metal block, and the excitation reactance of the asynchronous motor; The voltage source E1' is: the induced electromotive force of the metal block with the frequency reduced to the stator side.

2. The equivalent circuit of the eddy current separator according to claim 1, wherein The devices on the main road are, in sequence: resistor R1, impedance X 1σ , resistor R2', impedance X 2σ ', resistor R3', impedance X 3σ ', voltage source E1' and voltage source E3.

3. The equivalent circuit of the eddy current separator according to claim 2, characterized in that, The resistor R m has one end connected between 1σ the impedance X and the resistor R2', and the impedance X m has one end connected to the resistor R m and the other end connected between the voltage source E3 and the voltage source E2.

4. Eddy current separator, characterized in that, The separator includes: the equivalent circuit of the eddy current separator described in Claim 1.

5. The eddy current separator according to claim 4, characterized in that The separator further includes: an asynchronous motor, and the asynchronous motor includes an equivalent circuit of a linear motor; The equivalent circuit includes: resistor R4, resistor R s , impedance X 4σ , impedance X 5σ , and impedance X m0 ; The resistor R4 and resistor R s , impedance X 4σ and impedance X 5σ are connected in series on the first main path, and both ends of the first main path serve as the input terminals of the equivalent circuit; The impedance X m0 is in parallel with the resistor R s and the impedance X 5σ in parallel; The resistor R4, resistor R s , impedance X 4σ , impedance X 5σ , and impedance X m0 are successively: the primary winding resistance, the secondary resistance referred to the primary, the primary leakage reactance, the secondary leakage reactance referred to the primary, and the magnetizing reactance.

6. The eddy current separator according to claim 5, characterized in that, The devices on the main path 1 are, in sequence: resistor R4, resistor R s , impedance X 4σ and impedance X 5σ .

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