Linear synchronous motor having variable pole pitches

Details Linear synchronous motor having variable pole pitches Linear synchronous motor having variable pole pitches

1991-04-25

1993-05-04

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Linear

318135, 104282, H02K 4100, B60L 1304

Patent

active

052084965

ABSTRACT:
A linear synchronous motor for a high speed, ground transportation vehicle is provided. The motor includes a linear stator assembly that is divided into sections. The stator assembly has an air gap and generates a magnetic field traveling wave therein from a constant frequency alternating current. The traveling wave has variable speeds and accelerations along different sections of the stator. A rotor assembly has a plurality of magnets forming at least one pole-pitch of a variable length. The rotor assembly is coupled to the vehicle and disposed in the air gap of the stator and runs laterally therewith, producing an attractive force between a magnetic field of the rotor and the traveling wave of the stator. The magnetic field of the rotor propels the vehicle. The magnetic field of the rotor also generates a levitation force levitating the vehicle. A synchronizing unit is operatively associated with the rotor assembly to vary the length of the pole-pitch so that the pole-pitch length is substantially equal to one-half the length of the traveling wave at any given position along the linear stator assembly.

REFERENCES:
patent: 3934183 (1976-01-01), Saufferer
patent: 4131811 (1978-12-01), Apsit et al.
patent: 4603640 (1986-08-01), Miller et al.
patent: 4742255 (1988-05-01), Nakagawa et al.
patent: 4953470 (1990-09-01), Yamaguchi
Argonne National Laboratory: Maglev Vehicles and Superconductor Technology: Integration of High-Speed Ground Transportation into the Air Travel System; L. R. Johnson et al.; Apr. 1989.

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