Linear induction motor
Abstract
Abstract A POLYPHASE LINEAR INDUCTION MOTOR COMPRISING A PRIMARY MEMBER HAVING MAGNETIC MATERIAL FORMED WITH A POLYPHASE WINDING AND , FOR CO-OPERATING WITH THE PRIMARY MEMBER, A SECONDARY MEMBER COMPRISING ELECTRICALLY CONDUCTIVE MATERIAL BACKED BY FURTHER MAGNETIC MATERIAL IS SO ARRANGED THAT THE WORKING FLUX PASSES IN LOW RELUCTANCE PATHS LYING SUBSTANTIALLY IN PLANES DIRECTED TRANSVERSELY OF THE MOTOR. THE DEPTH OF MAGNETIC MATERIAL REQUIRED FOR A PARTICULAR AIR GAP FLUX DENSITY IS THEREFORE SUBSTANTIALLY INDEPENDENT OF THE POLE PITCH SO THAT LARGE POLE PITCHES AND HENCE HIGH SYNCHRONOUS SPEEDS CAN BE ACHIEVED WITH TOLERABLE DEPTHS OF MAGNETIC MATERIAL. A PARTICULAR APPLICATION OF THE INVENTION IS TO HIGH SPEED TRANSPORTATION SYSTEMS IN WHICH THE SECONDARY MEMBER FORMS PART OF THE PREPARED TRACK.
Inventors
No inventors recorded.
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |