DIRECT-ACTING TYPE MOTOR

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PROBLEM TO BE SOLVED : To solve a problem of a direct-acting type motor which is called as a voice coil motor because the direct-acting type motor is a motor using Lorentz force based on relative motion of a permanent magnet and a coil and thus is similar to a voice coil of an audio speaker, but increases the cost because rare earth (rare earth element) must be used to enhance the performance because of use of the permanent magnet as a core portion, has difficulties in durability such as crack or reduction of magnetic force of the magnet, and requires maintenance inspection for long-term use. SOLUTION : A permanent magnet of a prior art is replaced by a magnetic body of iron or iron alloy, and a coil energization amount is adjusted according to the direct-acting displacement amount of the magnetic body to induce mechanical power. The generated force is not Lorentz force, but the force based on the electromagnetic action of the rod-like magnetic body and the coil (force occurring from magnetic energy), whereby a direct-acting type motor having no permanent magnet can be implemented. SELECTED DRAWING : Figure 14 COPYRIGHT : (C)2016, JPO&INPIT