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The PRM which uses reluctance torque positively and reduced the amount of magnets relatively, and the industrial low-voltage inverter to which the PRM control function is applied has been developed. Though exact motor parameters may not be known, the inverter has a control method which on-site PMM control commissioning can be performed easily for such the case. The combination test of the PRM and...
A compressor which is used in liquefied natural gas (LNG) plant is mainly driven by turbine engine, but consideration for electrically driven compressor by a motor is increasing. Particularly, application of a motor driven by an inverter has the advantage of adjustable speed control of compressor. However, there is a concern of compressor train stop due to inverter failure. To eliminate this concern,...
This paper presents a novel motor surge voltage suppression system which utilizes a newly developed surge suppression cable. The feature of the system is that the surge suppression cable is connected in parallel with the motor terminal those independent from the main cable, and there is no need to connect any passive filter component for suppressing the motor surge voltage. The advantage of this method...
This paper presents one of the methods to improve a input current waveform of a neutral point type step-down converter circuit which we developed before. A neutral point type step-down converter circuit shares switching devices with half bridge inverter, and it is the circuit which can constitute an electronic ballast of a one converter method. A neutral point type step-down converter circuit has...
This paper presents a neutral-point type buck-boost converter that can decrease input current harmonics and reduce the generation of inrush current at start when turning on. It is possible to utilize this circuit as a converter for the electronic ballast, and the switches in the converter are shared with the inverter for the lighting. It is confirmed by experiments that the proposed electronic ballast...
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