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High-frequency current in the bearings of variable-frequency motors coupled with their shafts is a common issue that will shorten the bearings lifetime ultimately. A new method, which could be used to suppress high-frequency discharge bearing current, was proposed in this paper. In this method, an electromagnetic shielding slot wedge (ESLW) was used to reduce the capacitive coupling between the stator...
The research on variable frequency system mainly focuses on the developing of system performance, while the negative effects of the system is ignored. The bearing currents issue is a typical negative effect. In this paper, a lumped common mode model of a variable frequency induction motor driven by PWM inverter is proposed and the formulas of the key parameters in the model are presented and impedance...
The purpose of this design is to make waves can be converted to electrical energy, and a new wave permanent magnet linear generator is proposed. The new designed permanent magnet linear generator moves with the waves up and down, by changing the loop with the reluctance to change the size of the magnetic flux coupled windings, which will have a generator winding EMF. The buoy structure uses the holistic...
The 3-D temperature rise of flameproof induction motor are analyzed and computed by using finite element method. The heat resource of the motor, the equivalent coefficient of heat conductivity for the stator coil, and the coefficient of heat convection in the air-gap are analyzed. The complex heat exchanges between the stator and air-gap and that between the rotor and air-gap by convection are specially...
This paper presents a novel strategy to model the structures in the end winding of flameproof motor and calculate the magnetic field in this region. The three dimensional (3-D) nonlinear anisotropic magnetic field including the eddy current losses is calculated by utilizing the magnetic vector potential formulation. With the help of Biot-Savart's law, the magnetic field caused by the currents in the...
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