Patent ID: 7412071

Claim:
A low-inductance electromagnetic drive without driving a magnetic flux circuit, comprising: a magnetic pole; a drive coil; an upper magnetic inductive board; a permanent-magnet; a lower magnetic-inductive board, said magnetic pole being integrated with said lower magnetic-inductive lower board, said permanent magnet being located between said upper magnetic-inductive board and said lower magnetic-inductive board, wherein said drive coil at least partially surrounds said magnetic pole and is movable in an axial direction; a first fastening coil with an inductance substantially equivalent to an inductance of said drive coil, wherein said first fastening coil is aligned in a position in said magnetic flux circuit and connected with said drive coil in opposite phase to receive the equivalent and opposite excitation; and, said first fastening coil is located between drive coil and said magnetic pole, fixed to said magnetic pole, and connected with said drive coil by opposite phase to obtain the smallest inductance and equivalent excitation of opposite phase.