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This paper presents an energy harvester based on an improved eccentric rotor to generate electrical power from human body motion. An eccentric mass is suspended by a rotational spring to enhance the mechanical energy captured from low and random frequencies. An analytical model of the sprung eccentric rotor is developed to explore the power generation at a volume of 1 cm3. To compare with the conventional...
An energy exchange relation of the permanent magnet synchronous motor control system is analyzed firstly. Then a novel control strategy using the rotor kinetic energy is proposed. A load estimation method is put forward for the load and inertia ripple. The simulation and experiment results demonstrate the effectiveness of the proposed control strategy and the method.
A novel design of a nonlinear full-order observer for sensorless vector controlled induction motors is proposed in this paper. It is known that the speed-sensorless vector control drive system of induction motors does not perform satisfactorily at the low speed, which is caused by the voltage model and its emf calculation of motors. The nonlinear full-order observer system abandons the voltage model...
Generator retaining ring is one of the maximum stress parts. The safety performance of hydrogen-cooled generator retaining ring directly affects the operation of generators and the influencing factors were studied in this paper. The mechanics of cracks on the retaining ring was analyzed. Using ANSYS finite element analysis software, the stress on the retaining ring of running generator is analyzed,...
The brushless doubly fed machines (BDFM) have been widely researched. The BDFM system has lots of advantages such as brushless, simplicity, robustness and reliability, and a much smaller power electronic converter compared to a conventional AC induction machine. The BDFM as a new type of AC machine and is attractive for converter-fed variable speed drive applications and variable-speed constant-frequency...
This paper presents a new method for dynamical control of the linear motor which consists of Halbach permanent array. This motor is designed for micro-motion or micro-location precision instruments. Based on a novel mathematic model of the linear motor, which takes the lateral and normal force into account, an improved field-oriented control method is applied. This method enables the operation of...
In this paper, the relationship between rotor position and phase voltages of permanent magnet (PM) brushless DC motors(BLDCM) is analyzed, a novel sensorless position control method for BLDCM is proposed, which is based on adaptive wavelet neural network(WNN). In this method, a multiple inputs-single output wavelet neural network model is built according to the analysis of sensorless position and...
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