| 摘要 |
An electromagnetic linear drive has a stationary unit, a mobile unit centered and coaxially placed with respect to the stationary unit and an enclosing assembly made of diamagnetic material to support and protect the stationary unit and the mobile unit. The stationary unit contains a coil, wound around a bobbin made of non-conductive and diamagnetic material including a stationary magnet coaxially attached to the lateral face of the bobbin. The mobile unit includes a mobile magnet fastened to a shaft made of diamagnetic material which holds, positions and further transfer the linear motion of the mobile magnet to the driven device. Two stationary units are used to obtain controlled movement in both direction. The permanent magnets are magnetized in the direction of their thickness, coaxially positioned and arranged to repulse each other. The coils are connected in series with the magnetic fields opposed. The mobile unit is moved by synergetic attraction and repulsive forces of a bi-directional rectangular electric current, generated by a bridge type circuit through the coils of the stationary units. This invention has higher output force and operating frequency created by eliminating ferromagnetic materials. This linear drive directly converts electric energy to linear motion. It can be used where precise movement is required or in applications such as pumps, robotics, loudspeakers and underwater communications.
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