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This paper studies a soft starter of six-phase BLDC motor, presents a soft start method based on complex programmable logic device (CPLD), analyzes the soft starting process of six-phase BLDC motor and the influence of PWM carrier frequency and duty on starting process, employs back EMF zero crossing detection circuit to detect the rotor position, designs the hardware circuit and program of the soft...
This paper introduces a time stepping finite element analysis (FEA) model coupling circuit-field and movement used in analyzing multi-phase permanent magnet brushless DC (BLDC) motors, presents the element analysis about the coupling problem of control circuit and field, adopts the interpolation moving boundary method to solve rotation problem of the rotor, and employs the above model to analyze the...
Because permanent magnets (PMs) exist in the d-axis magnetic circuit of tangentially magnetized PM synchronous motor, its magnetic field and calculation of inductance parameter is different from common synchronous motor. A new analytic method of calculation of PM motor inductance parameter is proposed in this paper, which is based on basic air gap magnetic field and is more convenient than the conventional...
Electric motors are operated with cyclical loading on Nodding Donkey oil pump. This varying load impacts motor efficiency, energy consumption which is the largest part cost for the operation of oil-well pumping units. And high loss of energy is a common and urgent problem in all oil fields. Based on the research on beam pumping units operating, this paper presents a novel method of energy saving,...
A trapezoidal waveform is usually used instead of the actual back EMF in numerous research literatures on simulation of brushless DC (BLDC) motors, which causes the errors to the simulation and calculation of the motor. This paper adopts the flux linkage changing rate matrixes of the permanent magnets to calculate the back EMF, establishes the mathematical model of a 30 kW six-phase BLDC motor based...
By the equivalent surface current method, the paper get the analytical algorithms of air-gap magnetic field in PM (permanent magnet) motor, which is with tile-form poles and magnetized by different modes. From the results, an ideal flat-roofed wave of air-gap magnetic field is produced under radial magnetization; while, an arc-roofed wave produced under parallel magnetization. Because it's difficult...
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