6 results about "Flux density distribution" patented technology

The invention discloses a motor high-frequency magnetic field, electromagnetic force and loss calculation method. The method comprises the steps of calculating a motor armature magnetomotive force according to the number of turns and a slot matrix of a motor in combination with a phase current of the motor at any moment; establishing a motor quasi-static finite element model, and extracting a slot leakage magnetic field generated under fundamental current simulation; simplifying the finite element model, and calculating total slot leakage flux density distribution of a motor armature and a slot leakage magnetic field generated by a permanent magnet; calculating a complex slot leakage magnetic field permeability function of the motor armature by combining the armature magnetomotive force; calculating a motor armature slot leakage magnetic field according to the armature magnetomotive force and the magnetic conductance function; synthesizing the motor armature slot leakage magnetic field and the slot leakage magnetic field generated by the permanent magnet to obtain quasi-static distribution of the leakage magnetic field at the cross section of the motor conductor; solving a two-dimensional eddy current field mathematical model according to the differential equation of the time-harmonic field in combination with the quasi-static distribution result of the leakage magnetic field to obtain the distribution condition of the time-harmonic field magnetic field at the conductor cross section; and calculating the electromagnetic force and loss of the motor according to the distribution condition of the magnetic field of the time-harmonic field.

The application discloses a low-vibration permanent magnet motor with harmonic directional suppression rotor modification and a design method thereof, determines the structure and size of the permanent magnet motor, analyzes electromagnetic performance of the motor, determines the harmonic order and phase of the radial permanent magnet flux density, analyzes vibration characteristics of the motor, determines the main vibration frequency and the radial force order of the leading vibration, so as to determine the order of the radial permanent magnet flux density which needs to be reduced, analyzes the relationship between the air gap permeance and the flux density, determines the order and phase of the air gap permeance which needs to be added according to the radial permanent magnet flux density distribution which needs to be reduced, establishes a compensation function by adding the air gap permeance which is opposite to the radial permanent magnet flux density which needs to be reduced, and determines the position and shape of the modification according to the period and shape of the compensation function, and determines the depth of the modification by considering the torque performance and stress of the motor. According to the method, the specific radial permanent magnet flux density harmonic can be directly reduced, the vibration response can be effectively suppressed, and the torque performance of the motor is not changed.

The invention provides a coil eddy current loss calculation method, device and equipment based on model simulation, and relates to the technical field of power systems, and the method comprises the steps: carrying out the simulation calculation according to a pre-constructed transformer coil simulation model, and obtaining the out-of-window flux density distribution and in-window flux density distribution of each turn of wire in a transformer coil; in the end area of the transformer coil, the transverse magnetic density in the out-window magnetic density distribution is larger than the transverse magnetic density in the in-window magnetic density distribution, and the longitudinal magnetic density in the out-window magnetic density distribution is smaller than the longitudinal magnetic density in the in-window magnetic density distribution; and obtaining the transverse eddy-current loss and the longitudinal eddy-current loss of the wire based on the outside-window magnetic density distribution, the inside-window magnetic density distribution and the iron yoke covering length corresponding to the wire, and further calculating the coil eddy-current loss of the transformer coil. According to the method, the influence of the iron yoke on the flux density distribution can be considered, and the accuracy of coil eddy current loss calculation is improved.

The invention discloses a composite material flat wire motor copper loss optimization method based on field-circuit coupling. The method comprises the following steps: dividing each layer of flat wire conductor in a stator slot of a flat wire motor into a plurality of basic rectangular units according to rows and columns on a section; calculating the flux density of each basic rectangular unit at each moment by using a finite element method, calculating the alternating current loss and the direct current loss of each basic rectangular unit, and accumulating calculation results to obtain the alternating current loss and the direct current loss of each layer of flat wire conductor; the minimum total copper loss of each layer of flat wire conductor is taken as an optimization target, a genetic algorithm is adopted to carry out optimization by taking a material variable of each basic rectangular unit as a gene to obtain the material selection of each basic rectangular unit in each layer of flat wire conductor, the material variable is the conductivity of a material, and the material variable is selected from a plurality of candidate values. Through the selection and distribution of the conductive material of the basic rectangular unit, the flux density distribution in the groove is accurately matched with the conductivity of the material, the copper consumption is reduced, and the optimization result has high precision and high calculation speed.

The utility model provides a motor and a compressor, and relates to the technical field of motors. The motor comprises a motor stator and a motor rotor, the motor rotor is arranged inside the motor stator, a plurality of first slotted holes are formed in the motor stator in the circumferential direction of the motor stator, a plurality of second slotted holes are formed in the motor rotor in the circumferential direction of the motor rotor, and the motor at least meets one of the following formulas: (Q1 * TS) / HC1 is larger than 5.4 and smaller than or equal to 6.0, (Q2 * TR) / HC2 is larger than or equal to 3.5 and smaller than or equal to 4.1, and (Q1 * TS) / (Q2 * TR) is larger than or equal to 0.9 and smaller than or equal to 1.2; wherein Q1 is the number of the first groove holes, Q2 is the number of the second groove holes, TS is the average tooth width of the first groove holes, TR is the average tooth width of the second groove holes, HC1 is the average groove yoke width of the first groove holes, HC2 is the distance between the second groove holes and the circle center of the motor rotor, the magnetic circuit flux density distribution of the motor is reasonable, and the probability of bad problems is reduced.

This application discloses a neutron flux density distribution measurement device and system, relating to the field of nuclear industry technology. The device includes: M first optical fibers, each arranged at a corresponding test location in the core of a critical device; each first optical fiber is filled with a neutron-sensitive material; M is a positive integer; a luminescence intensity measurement unit connected to each first optical fiber, used to measure the luminescence intensity of the first optical fiber corresponding to each test location to obtain M luminescence intensities; and a computer connected to the luminescence intensity measurement unit, used to acquire the M luminescence intensities and determine the neutron flux density distribution at each test location based on the M luminescence intensities. According to the embodiments of this application, this device can reduce disturbances to the neutron field within the reactor and can quickly and easily monitor the neutron flux density distribution within the reactor in real time.