Cylindrical Linear Pulse Motor with Interior Permanent Magnet Mover

Abstract

The linear pulse motors (LPM) operate in an open-loop control mode similarly to a rotary stepper motor, and therefore serve as an effective positioning actuator when used in conjunction with digital electronic control circuits. The linear motion without any mechanical linkage results in several advantages for precision positioning actuators. While flat LPMs are generally used in industrial applications, these LPMs result in a heavier and more complex mover support mechanism due to the high attraction force between the stator and mover. A cylindrical LPM, however, can accomplish the same object with a simple, lightweight support mechanism because the attraction force is reduced in a cylindrical structure.
In this paper, a new cylindrical LPM with interior permanent magnet mover is proposed. And new configurations to reduce the thrust imbalance are examined. Dynamic force is also examined. It is cleared that the cylindrical LPM with interior permanent magnet mover is very effective to improve the thrust imbalance and increase dynamic thrust force.