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Patent Agency Ranking
公开(公告)号：US20200287450A1
公开(公告)日：2020-09-10
申请号：US16060890
申请日：2017-06-07
Inventor： Dawei LI , Kangfu XIE , Ronghai QU
Abstract: The present invention discloses a stator, a rotor and a multi-working-harmonic permanent magnet motor using the above rotor and the stator, wherein the N poles and the S poles are alternately distributed in a circumference direction of the rotor core or the stator core; any N pole comprises at least one N-pole permanent magnet; any S pole comprises at least one S-pole permanent magnet; and at least two adjacent N pole and S pole has different widths. According to the invention, through the arrangement of magnetic poles with different widths on a rotor or a stator, it is possible to generate magnetic fields containing a plurality of harmonic magnetic fields with high amplitudes so that the harmonic magnetic fields can interact with the magnetic fields generated by the armature windings of the permanent motor to realize the superposition of multi-part torques, thereby further enhancing the outputted torque of the motor. In addition, with the invention, the harmonic permanent fields can be completely decoupled on the frequency, thereby significantly improving the fault tolerance performance of the motor, and as a dual-mechanical-port motor, the motor of the invention can be applied to electric vehicles and other relevant variable transmission field.
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公开(公告)号：US20220216777A1
公开(公告)日：2022-07-07
申请号：US17606737
申请日：2021-01-21
Inventor： Dawei LI , Li FANG , Xiang REN , Ronghai QU
IPC: H02K21/22 , H02K1/2791
Abstract: A method includes calculating an initial phase θgv of each air gap working magnetic field Bgv required to generate positive back EMF based on certain parameters of each armature harmonic vth; generating Bgv and maximizing a sum of equivalent air gap flux density amplitude Beqv of each of the air gap working magnetic fields Bgv while calculating a phase θmv and a pole arc coefficient αv corresponding to each permeance harmonic; designing a number, a position(s) and a length(s) along a circumference of modulation teeth corresponding to each of the permeance harmonics based on the phase θmv and the pole arc coefficient αv, such that a generated permeance model is consistent with the phase θmv of each of the permeance harmonics; and optimizing radial dimensions of modulation teeth corresponding to each of the permeance harmonics to maximize the sum of equivalent air gap flux density amplitude Beqv.
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3.发明公开公开(公告)号：US20240265164A1
公开(公告)日：2024-08-08
申请号：US18695934
申请日：2022-03-15
Inventor： Yawei WANG , Yuhang CHENG , Ronghai QU
CPC classification number: G06F30/17 , G06G7/62 , H02K19/103
Abstract: The present invention discloses a method for determining a tooth magnetic flux density ratio and an optimal split ratio of a motor, relating to the field of motor design. The method includes: under the condition that different numbers of series turns per slot are given, performing analytic calculation to acquire a plurality of stator slot area and current density curves with a motor split ratio being an independent variable; using a magnetic flux density ratio to acquire tooth and yoke thicknesses of a motor when at different split ratios, acquiring a model of the motor, and then performing finite element simulation on the motor model to acquire a plurality of average torque curves with the motor split ratio being an independent variable; acquiring a motor split ratio corresponding to the maximum value of each average torque curve, and substituting the same into a corresponding current density curve to acquire current density at maximum average torque for the different number of series turns per slot; and acquiring a motor split ratio when maximum current density is not exceeded and the average torque is at maximum, and using the same as the optimal split ratio of the motor. In the present invention, the optimal split ratio of a motor is rapidly and accurately determined by means of finite element simulation in combination with analytic calculation.
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公开(公告)号：US20230336039A1
公开(公告)日：2023-10-19
申请号：US17765847
申请日：2021-01-21
Inventor： Dawei LI , Li FANG , Xiang REN , Ronghai QU
Abstract: A vernier permanent magnet motor with a stator having coded auxiliary teeth which belongs to the technical field of permanent magnet motors. The motor includes a stator and a rotor that are coaxially sleeved, and an air gap is formed between the stator and the rotor. Coded auxiliary tooth structures are provided on a side surface in the stator close to the air gap, and first permanent magnets are provided on part of the coded auxiliary tooth structures. A plurality of pairs of second permanent magnets and ferromagnets are arranged around a side surface in the rotor close to the air gap. The first permanent magnets and the ferromagnets generate a first magnetic field, the second permanent magnets and the coded auxiliary tooth structures generate a second magnetic field, and the magnetic fields are superimposed to form working magnetic fields.
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公开(公告)号：US20190229668A1
公开(公告)日：2019-07-25
申请号：US16312750
申请日：2018-02-11
Inventor： Dong JIANG , An LI , Ronghai QU , Wubin KONG , Zixiang YU
Abstract: The present invention discloses an open-winding motor drive topology and a modulation method thereof. Each bridge arm includes an upper bridge arm power switching device and a lower bridge arm power switching device, an upper node of the upper bridge arm power switching device is connected to a DC bus voltage, a lower node of the lower bridge arm power switching device is connected to a power ground, and a lower node of the upper bridge arm power switching device and an upper node of the lower bridge arm power switching device are connected as an output node of the bridge arm; the output node of the first bridge arm is connected to a left node of a A-phase stator winding of the open-winding motor, the output node of the second bridge arm is connected to a right node of the A-phase stator winding and a left node of a B-phase stator winding of the open-winding motor, the output node of the third bridge arm is connected to a right node of the B-phase stator winding and a left node of a C-phase stator winding of the open-winding motor, and the output node of the fourth bridge arm is connected to a right node of the C-phase stator winding of the open-winding motor. The invention improves the power density of the drive, thereby ensuring the working performance of the motor.
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