This paper presents a novel design of speed control for a permanent magnet synchronous motor (PMSM).In the double loop of PMSM speed adjustment systems, the current loop adopts PI control and the speed controller adopts compound control strategy with particle swarm optimization (PSO). Simulation results show that the proposed controller is superior to the traditional PI controller. It has good dynamic and static characteristics, such as quick response and less steady-state error.
This paper proposed a microstrip antenna with the operating bands of LTE700, LTE900 and LTE1800 for mobile device applications. This antenna was printed using FR-4 substrate material. The overall dimension of the antenna is 135 mm x 32 mm x 1.6 mm with 50 Ω impedance. The usage of ground plane can generate resonant modes to expand the bands at low frequency. Operating frequency bands of the antenna for the LTE and GSM/GPS/IMT-2000 meet the specification with 6 dB return loss.It is well suitable to be used for mobile device application.
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