| 摘要 |
<p>In one construction of the invention, the motor comprises a flat annular disk mounted for rotation on a motor shaft, and the stator comprises a plurality of tooth-shaped polar portions facing other polar portions on either side of the annular disk in a direction parallel to the shaft of the disk. The annular disk contains portions of alternating polarity which sequentially pass the tooth-shaped polar portions during rotation of the disk. Maximum torque per Ampere-turn is accomplished by setting a minimum air-gap width in the range defined by the relationship 0.389 P + 1.4 </= P/E </= 0.706 P + 1.85, with P being the space in millimeters between the centers of the magnetic poles of like polarities of a multipolar permanent magnet arrangement disposed on the rotor and between the centers of regions of minimum width of the air-gap, and E being the width in millimeters of the space between opposite parts of permeable magnetic material. The present invention further provides very good dynamic characteristics such as power rate and acceleration.</p> |
