| 摘要 |
<p>PROBLEM TO BE SOLVED: To solve the problem when a motor obtaining an electromagnetic force by an interaction between a current applied to a coil and a magnetic field of a magnet is used for the drive of an apparatus sensitive to a magnetic field, the expected performance of the apparatus can not be exhibited due to leakage magnetic field from the motor and, in order to shield the apparatus from the leakage magnetic field, the dimensions and cost of the apparatus are increased. SOLUTION: An auxiliary coil, generating a magnetic field, which cancels a leakage magnetic field is provided in a neighborhood of a drive coil. At that time, the coil is provided so as not to make an electromagnetic force applied to the coil give harmful influence upon an expected performance of a motor.</p> |
