Heteropolar magnet

Details Heteropolar magnet Heteropolar magnet

1985-03-29

1987-01-13

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Linear

104291, 104294, 104292, 318135, H02K 4100

Patent

active

046366660

ABSTRACT:
An excitation arrangement for a long stator drive, particularly a synchronous long stator drive for rapid transit systems having combined generation of propelling and carrying forces comprises at least one heteropolar magnet which has a plurality of channels extending at right angles to the long stator direction and which are open at their pole plane lying opposite the long stator and in which magnetic coils assigned to the conductors are disposed. In order to improve the dynamic properties of the magnet, a subdivision of the magnetic coils generating the magnetic field is provided. Differing electrical behavior for slow and fast changes in the voltage driving the coil current is achieved by a tight coupling of one of the sub-coils to a short-circuit coil. Given slow changes in the drive voltage, a magnetic force resulting from the entire coil flux occurs. Given fast changes in the drive voltage, a dynamic reduction of the effective coil inductance leads to a fast current and magnetic force changes.

REFERENCES:
patent: 3167168 (1965-01-01), Park
patent: 4131811 (1978-12-01), Apsit et al.

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