In this paper, a double-stator tubular PM (DSTPM)
motor has been newly proposed, which has two tubular stators
and one tubular mover. The magnetic circuits of the inner stator
and the outer stator are in series, thus reducing the motor radial
length. As a result, the motor volume can be saved, and the
motor force capability can be improved. Its topology and electromagnetic
performance are presented and analyzed. In order
to accurately calculate the cogging force and the end force of the
proposed four-slot/seven-pole motor, three slot/pole combinations
are modeled and analyzed, namely, 4-slot/7-pole, 8-slot/14-pole,
and 12-slot/21-pole ones. Then, the end teeth are optimized to
minimize the detent force. A new control strategy is proposed
to improve thrust force performance. By using the finite-element
method, the proposed motor is verified.