Electrical generator or motor structure – Dynamoelectric – Linear
Patent
1996-04-12
1998-02-10
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Linear
318135, 104282, H02K 4103
Patent
active
057172617
ABSTRACT:
A Linear Synchronous Motor for a high-speed, ground transportation vehicle includes a linear extended guideway stator assembly containing two extended symmetrical three-phase stator windings supported on the guideway and a rotor installed on the vehicle chassis and having an even number of identical units. When the winding is powered by three-phase sinusoidal current of constant frequency, the traveling wave of the sinusoidal current arises and runs along the stator. By varying the length of the turns of the stator windings, the velocity of the traveling wave is variable on different sections of the guideway, which include acceleration section, constant velocity section and deceleration section. Each of the rotor units includes vertically magnetized permanent magnets and two "C"-shaped steel cores which close the magnetic lines through two parallel air gaps. The permanent magnets move downward and upward within the "C"-shaped steel cores. The turns of the stator windings pass through the air gaps in the rotor units, so that the traveling wave interacts with the magnetic field in the air gaps and creates the Lorenz force propelling the vehicle. Two synchronizing devices are operatively associated with the rotor to coordinate the length of the turns of the stator windings with the length of the pole-pitch of the rotor. One of the synchronizing devices controls movement of the permanent magnets upward and downward with respect to the "C"-shaped steel cores to change the pole-pitch of the rotor step-wise, and another one moves the units of the rotor apart and together to change the pole-pitch of the rotor smoothly. As the result, the linear synchronous motor provides the vehicle motion with designated speed at any section of the guideway/stator.
REFERENCES:
patent: 5208496 (1993-05-01), Tozoni et al.
patent: 5225726 (1993-07-01), Tozoni
Jones Judson H.
Stephan Steven L.
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