双并列转子永磁直驱电机转子不平衡力分析与优化

doi:10.19595/j.cnki.1000-6753.tces.230427

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Abstract

Most parallel synchronous drive equipment such as two-roll mill and twin-screw pump are driven by induction motor with synchronous mechanical gear. Such drive system has problems such as large volume, poor synchronization of master and slave shafts and the need for regular maintenance. Dual-parallel rotor permanent magnet direct-driven motor has gradually come into view.
Due to the limitation of distance between rotating shafts, part of stator core and windings will be cut off in the design of dual-parallel rotor permanent magnet direct-driven motor, resulting in unbalanced rotor electromagnetic force. In order to suppress the unbalanced electromagnetic force on the rotor to the maximum extent, this paper analyzes the reasons for the asymmetry of inductance parameters of the motor windings from the double-parallel rotor structure, discusses and calculates the inductance parameters of the motor with windings pitch of 4 and 3, and proposes to balance the three-phase inductance through reasonable design of coil pitch and windings distribution. On this basis, the mathematical model of the total electromagnetic force on the rotor is constructed, the source and influencing factors of each component force are analyzed theoretically, and the influence of each component force on the total electromagnetic force on the rotor is studied. Five optimization methods are proposed to optimize the electromagnetic force on the rotor, including optimizing the duty angle, optimizing the coupling distance, adopting the asymmetric stator end structure, adopting the eccentric rotor structure and eliminating part of the unit motors. Finally, the optimization effects of different methods and their effects on torque ripple are discussed, and the advantages and disadvantages of different optimization methods are summarized, which lays a foundation for the research and development of dual-parallel rotor permanent magnet direct-driven motor.
The following conclusions can be drawn from the simulation analysis: 1) When the dual-parallel rotor permanent magnet direct-driven motor adopts the modular structure, the long-pitch coil will make the three-phase inductance parameters asymmetric, and the three-phase inductance can be effectively balanced by reasonable selection of the winding pitch and the head end of the A-phase winding. 2) The electromagnetic force F_totalon the rotor consisted of the electromagnetic force F₁ between the stator with windings and the corresponding rotor, the magnetic force F_mag between two permanent magnet rotors in the coupling area, the force F_end between the core end and the rotor outside the duty area in the coupling area, the magnetic resistance force F_end,cogof the rotor against the core end in the coupling area and additional electromagnetic force F_ad. The X direction force of F_total is related to the above forces, while the Y direction force of F_total is only relevant to F₁. F₁, F_mag and F_endare the most important components of F_total. 3) According to the analysis of the F_total, five methods are proposed to weaken the F_total, including optimizing the duty angle, optimizing the coupling distance, adopting the asymmetric structure of the stator end, adopting the eccentric structure of the rotor and eliminating part of the unit motors. The influence law of the five optimization methods on the electromagnetic force is given, and the advantages and disadvantages of the five optimization methods are discussed. Among them, the method with rotor eccentric structure has the best optimization effect, but it requires higher processing technology. The method of eliminating partial unit motors is the most practical. 4) The adoption of five optimization methods can make the motor output rated electromagnetic torque. In practical application, the combination of various optimization methods can be considered.

Key words： Dual-parallel rotor permanent magnet direct-driven motor electromagnetic force optimization method

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TM351

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	Tao Dajun
	Chen Yang
	Li Zheng
	Ge Baojun

Cite this article:

Tao Dajun,Chen Yang,Li Zheng等. Analysis and Optimization of Unbalanced Electromagnetic Force on the Rotor of Dual-parallel Rotor Permanent Magnet Direct-driven Motor[J]. Transactions of China Electrotechnical Society, 0, (): 8930-.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.230427 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/8930

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