Abstract
Abstract The hybrid excitation synchronous motor (HESM), which aim at combining the advantages of permanent magnet motor and wound excitation motor, have the characteristics of low-speed high-torque hill climbing and wide speed range. Firstly, a new kind of HESM is presented in the paper, and its structure and mathematical model are illustrated. Then, based on a space voltage vector control, a novel flux-weakening method for speed adjustment in the high speed region is presented. The unique feature of the proposed control method is that the HESM driving system keeps the q-axis back-EMF components invariable during the flux-weakening operation process. Moreover, a copper loss minimization algorithm is adopted to reduce the copper loss of the HESM in the high speed region. Lastly, the proposed method is validated by the simulation and the experimental results.
Highlights
The hybrid excitation synchronous motor (HESM) which is a wide speed-range machine derived from the permanent magnet synchronous motor (PMSM), contains two coexisting excitation sources: permanent magnet and excitation winding
Comparing with the traditional PMSM vector control system, the HESM control system adds 3 functional sub-modules, which are the If PWM sub-module, the If Driver sub-module and the Current Distributor submodule, respectively
According to the proposed HESM control methods and the simulation results, a HESM controller based on TMS320F2812 + AT89C55WD architecture is set up, and the driving experiments are carried out correspondingly
Summary
The hybrid excitation synchronous motor (HESM) which is a wide speed-range machine derived from the permanent magnet synchronous motor (PMSM), contains two coexisting excitation sources: permanent magnet and excitation winding. The former generates the main air-gap magnetic flux and the latter produces the auxiliary one. Because of the excitation winding which can increase or reduce the flux of the air-gap magnetic field by changing the amplitude and direction of its current, the motor have the characteristics of low-speed hightorque and wide speed range. By comparing the above two methods with the non-flux-weakening control method through simulations and experiments, it can be validated that the copper loss minimization control method have the widest speed range.
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