We developed recently a high speed DC linear motor which uses on-board normal-conducting DC electromagnets and air-core track coils to produce both thrust and lift. Subsequent research has been aimed at applying the linear motor to a new-type of railway system. Past of this research had been directed toward the train operation control system for the DC linear motor, and has resulted in the evolution of a new control system in which constant speed running and station stopping of trains are successfully achieved.

Active-Synchronization Control System Used in DC Linear Motor

A DC linear motor (DCLM) which is now under development by authors, employs a simple mechanism including a conventional DC excited and iron cored electromagnet on-board, which is characterized in its capability to obtain both lift and thrust simultaneously. In order to realize a maglev system provided with a linear motor, it seems to be very important matter to reduce vehicle weight of on-board devices which affects reduction of installation cost and increase of energy efficiency. We have developed a boil-off cooling system to be used for on-board electromagnet in DCLM system and suceeded in remarkable weight reduction.

Study on miniaturization of electromagnet for DC linear motor

We have constructed a test facility for the linear motor car mainly to examine its propulsion characteristics. The 3.3 ton vehicle has a 2 ton propulsion force and can be accelerated to 165 Km/h in 200 m. In this paper, our investigation of the field-magnet and armature coils on the ground is reported. We discuss the correspondence of our theoretical analysis with the results of experiments. We believe that the results of our investigation can be readily applied to an actural DCLM line.

Development of a DC Linear Motor (II) Research for a Ground Coil and a Field-Magnet

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Development of a DC Linear Motor (II) Research for a Ground Coil and a Field-Magnet