| Adding an excitation coil to the rotor of the mixed rotor motor can enhance the air-gap field regulation ability of the permanent magnet motor effectively and adding a temperature sensor can prevent the damage of the permanent magnet in the over-temperature situation.However,both the rotor excitation coil and the temperature sensor need external power supply,and the power supply demand may change with the variation of working state of the motor.Using slip ring to power the equipment will introduce mechanical friction loss and using parallel generator structure is complicated to realize.Therefore,it is necessary to study a relatively simple structure of non-contact power supply system to meet the power supply demand of mixed motor rotor equipment,which not only be able to supply power to the dual load without contact,but also be able to achieve independent control of the output.In order to meet the power supply demand of rotor equipment,the following research is carried out in this paper:(1)Topology selection and gain analysis of dual-channel non-contact power supply system.Firstly,the principle of choosing each cascaded circuit topologies is described,and the gain of each cascaded circuit topologies are analyzed,which provides a basis for the subsequent research on dual-frequency dual-channel output decoupling control.Then,the output gain of system in the presence and absence of ipsilateral coupling and cross coupling of the dual-channel coupler is compared and analyzed,concluding that the dual-frequency dual-channel energy transmission coupling is mainly caused by the coupling of coupler in proposed system,which reveals the dual-channel energy transmission decoupling can be achieved by the decoupling of coupler.(2)Because in the single-inverter dual-channel wireless power transfer system the coupling between two channels of coupler will lead to the coupling of two channel energy transmission,a decoupling method of the rotating dual-channel coupler is proposed to eliminate the coupling of dual-channel energy transmission in this paper.Firstly,based on the decoupling principle of partially overlapping bipolar coils,the structure and decoupling basic method of the rotating dual-channel coupler is proposed.Then,the equivalent circuit model of coupler was established,and the expressions of ipsilateral mutual inductance and crossinductance were deduced;the electromagnetic simulation model of coupler was established,and the relationship between ipsilateral mutual inductance and cross-inductance and coil parameters of the coupler was studied by simulation.Finally,the decoupling method of the rotary dual-channel coupler is proposed,and coupler designed by the decoupling method is applied to the dual-frequency dual-channel wireless power transfer system,the experimental results show that the decoupling performance of the decoupling method is good.(3)Because of output control coupling of the fundamental channel and third harmonic channel in the single-inverter dual-channel wireless power transfer system it is difficult to realize the independent control of dual-frequency dual-channel output,in this paper a dualfrequency dual-channel output decoupling control system is proposed to eliminate the coupling of dual-channel control.Firstly,this paper introduces the dual-frequency dualchannel wireless power transfer system whose coupling of dual-channel energy transmission is eliminated,demonstrates the realization method of asymmetric phase shift switch drive,and derives the expression of the overall gain of the system.Then,the implementation of the control decoupling algorithm is analyzed from the perspective of control execution selection,and on this basis the dual-frequency dual-channel output decoupling control system and corresponding control flow are given.Finally,the performance of dual-channel output decoupling control system is verified through simulation and experiment,and the results of simulation and experiment show that control system can realize decoupling control of the dualchannel output. |
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