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This paper describes an adjustable-speed motor with a quadratic-torque load such as fans, blowers, pumps, and compressors. The motor is characterized by being driven by the modular multilevel cascaded inverter based on doublestar chopper cells (MMCI-DSCC) A design for both mean dc-capacitor voltage and ac-voltage fluctuation in each dc capacitor used within DSCC is carried out to provide a design...
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,...
Three-phase capacitor motor with main winding and auxiliary winding vertically arranged in space can effectively weaken the harmonic MMF (magnetic motive force), and raise efficiency and power factor. In this paper, performance of new three-phase capacitor motor in frequency control system is analyzed. Through the contrast experiment between the new three-phase capacitor motor and three-phase induction...
This paper presents a simple and low cost single-phase to three-phase cycloconverter topology for driving an induction motor with a single-phase ac supply. Only seven naturally communicated thyristors and one phase balancer capacitor are employed, so the resulting cycloconverter-motor drive system is cheap and compact. Using discrete hopping frequency technique, a single-phase to three-phase modulation...
This paper proposes an overmodulation method for improving the voltage utilization of NPC type 3-level inverter for traction drives. The conventional railway vehicle has used a vector control to MI=0.907 and a slip-frequency control from MI=0.907 to the six-step mode. The slip-frequency control has less output torque dynamics than the vector control. In this paper, the linear region of NPC type 3-level...
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