41results about How to "Eliminate mutual inductance" patented technology

The present invention relates to a cylinder type flux-reversal linear machine. The invention relates to the field of electric machine and settles the problems of low efficiency, large eddy current loss, complex technique and effect to control precision and dynamic characteristic in prior linear machine. The armature core of phase unit according to the invention is an annular core which is uniformly installed with 2n teeth on the inner circumstance, wherein n is a natural number. The armature winding of phase unit is a concentrated winding. Each coil is corresponding winded on each tooth of armature core of phase unit. The winding directions of coils on adjacent teeth are opposite. All coils on the teeth of armature core of same phase unit are connected in series to a same phase unit armature winding. The phase unit armature windings are connected in series or in parallel to each phase armature winding. A permanent magnet is adhibited on the teeth of armature core of phase unit. The phase unit armature core center distance taut between two adjacent phase armature units in axial direction and the tooth pitch taup of secondary teeth along the axial direction satisfy a relationship: taut=ktaup+ / -(1 / m)taup, wherein k and m are natural numbers, and m is a phase number and is larger than or equal to 3. The cylinder type flux-reversal linear machine not only can be used as a motor, but also can be used as a generator.

The invention discloses a transverse magnetic flux multi-phase reluctance motor, and relates to a reluctance motor, which solves the problem that magnetic coupling is existed between phases in a traditional multi-phase permanent magnet synchronous motor to affect the control precision of current. The reluctance motor consists of a stator and a rotor, wherein m phase armature units are arranged inan enclosure along an axial direction in sequence, and each phase armature unit is staggered in a 360 DEG / m electrical angle along a circumference direction in sequence; an armature coil is embedded in an annular space formed among first to third circular iron core sections; permanent magnets are fixedly arranged on the internal surfaces of the first and the third circular iron core sections along the circumference direction with alternated N-pole and S-pole in sequence; and a pole distance taum between every adjacent two permanent magnets and a tooth space taup of rotor teeth arranged along the circumference direction satisfy the formula of 2taum=taup. The reluctance motor disclosed by the invention eliminates the alternating mutual inductance, improves control accuracies of motor current and electromagnetic torque and dynamic property of ta system; and improves the reliability and the safety of the motor since the permanent magnets are located above the stator.

The invention relates to an electromagnetic prospecting sending-receiving integration method and a device. The invention is suitable for the fields of geophysical prospecting, engineering geological prospecting, underground military target detection, nondestructive inspection and the like. The technical scheme of the invention is as follows: arranging an inner receiving coil (1) in a sending coil (3); arranging an outer receiving coil (2) outside the sending coil (3); ensuring that magnetic flux passing through the inner receiving coil (1) and the outer receiving coil (2) is equivalent and is in opposite sign under the action of primary field; mutually offsetting primary field induced voltage; and only outputting a secondary field signal. The device comprises a transmitter (4), a sending coil (3), an inner receiving coil (1), an outer receiving coil (2), a signal conditioning circuit (5) and a receiver (6), wherein the inner receiving coil (1) is connected with the outer receiving coil (2), and the coil (1) and the coil (2) are connected with the signal conditioning circuit (5). The invention has the advantages of eliminating primary field influence, reducing signal dynamic range, expanding the practicability of small-wire frame same-point device and realizing integration of the sending coil and the receiving coil.

The invention discloses an asymmetrical bipolar coil that can be used in a modularized wireless power transmission system. The coil is wound clockwise or counterclockwise from the inside to the outside or from the outside to the inside to form a rectangle, and then in the opposite direction. The direction continues to form another rectangle from the outside to the inside or from the inside to the outside, and finally forms a double rectangular structure with two rectangles on the left and right, and the left and right sides of the coil present an asymmetric shape; the asymmetric The shape includes at least one of the following situations: 1) the shape of the left and right sides of the coil is asymmetrical; 2) the number of turns on the left and right side of the coil is asymmetrical; 3) the line spacing between the left and right sides of the coil is asymmetrical. The use of the asymmetric bipolar coil of the present invention can effectively eliminate the mutual inductance between coils on the same side, which is of great significance to improving system transmission efficiency and reducing system control difficulty, and is beneficial to the development of modular wireless power transmission systems.

The invention discloses a method for achieving decoupling of multiple emission coils arranged in a single row of a wireless electric energy transmission system. The system according to the method comprises N emission coils, wherein N is more than or equal to 3, and all emission coils are arranged in a single row. According to the method, a common branch reactance component is arranged between coupled power emitters, and inductance between the two emission coils comprising the common branch reactance component is eliminated by configuration. By the method, the inductance between two adjacent emission coils can be eliminated, and the inductance between the two emission coils isolated by one of the emission coils also can be eliminated. By the method, the system transmission efficiency is improved, and the system control difficulty is reduced.

The invention discloses an air core coil mutual inductance coefficient error elimination method and application based on a rotation cancellation principle. The method comprises steps of enabling a rotating disc to rotate by 360 DEG / n relative to a current carrying lead, measuring a voltage of an air core coil, rotating the rotating disc by the same degree and measuring a voltage, and performing n times of rotation; obtaining mutual inductance coefficients according to voltage and current values; and performing weighted average of the mutual inductance coefficients to obtain the accurate mutual inductance coefficient value of the air core coil. The invention discloses an air core coil current measurement method. The air core coil mutual inductance coefficient error elimination method is used for obtaining the mutual inductance coefficient, the rotating disc is rotated at the same degree by many times to obtain multiple groups of voltages of the air core coil, currents are obtained according to the mutual inductance coefficients and the voltages, and the accurate value of a tested current is obtained by weighted average of the multiple groups of currents. Under a precondition that factors of the air core coil symmetry, the current carrying lead cross section, the tested current central position and the like are unknown, the instability of the mutual inductance coefficient is reduced, influences on currents can be eliminated, and the measurement accuracy of the air core coil is improved.

A transverse flux cylinder type permanent magnet linear synchronous motor relates to the field of motor, and settles the problems of low efficiency, large eddy current loss, complex technique and effect to the control precision and dynamic characteristic. The transverse flux cylinder type permanent magnet linear synchronous motor of the invention comprises a primary stage, a secondary stage and anair gap. The number of phase armature units is S=nm, wherein n is a natural number. The number of axial magnetic poles formed by secondary permanent magnets is P=2i, wherein is a natural number. When no common divisor exists between S and P, the S phase armature units are equally divided to m groups along the axial direction, and each n adjacent phase armature units belong to one phase. When a highest common divisor j exists between S and P, the S phase armature units are equally divided into mj parts along the axial direction, and windings on each adjacent n / j phase armature units belong toone phase. The phase unit armature core tooth pitch taut between two adjacent phase armature units along the axial direction and the pole distance taup along the axial permanent magnet satisfies a relationship mktaut=(mk+ / -1)taup, wherein m and k are natural numbers, and m is the phase number of motor. The motor not only can be used as an electric motor, but also can be used as a generator.

The invention discloses a superconductive controllable reactor, which comprises a first segmented magnetic yoke, a second segmented magnetic yoke, a working coil, a superconductive excitation coil group and a low-temperature dewar, wherein the first segmented magnetic yoke is an iron core; the second segmented magnetic yoke comprises an excitation iron core group and two same cambered iron cores; the excitation iron core group consists of a plurality of excitation iron cores which are distributed and clamped in the two cambered iron cores of the second segmented magnetic yoke at equal radians; each excitation iron core is sleeved on each superconductive excitation coil; the inductance values of the superconductive excitation coils are the same, and the superconductive excitation coil group is formed by connecting the superconductive excitation coils in series; the two adjacent superconductive excitation coils are sequentially connected with one another according to homonymy terminals and synonym terminals; the number of the superconductive excitation coils and the number of the excitation iron cores are the same and even; and the superconductive excitation coils and the excitation iron cores are arranged in the non-magnetic low-temperature dewar. The superconductive controllable reactor can continuously and adjustably compensate the reactive power of a power grid in a large scale, so that reactive power balance is realized, the stability of a power transmission system is improved, the power transmission capacity is improved, and system overvoltage is suppressed.