Cylindrical linear motor having low cogging forces

摘要

Cogging forces of a cylindrical linear motor are reduced with a linear motor having a rotor with eight poles and a stator with 36 toroidal coils (optionally multiples of eighteen toroidal coils) inserted into slots (N1 to N36) (or a multiple of 36 slots). The toroidal coils extend in the circumferential direction of the stator, are of equal size, and are arranged axially one behind the other. All the terminals of the toroidal coils are located in an axially extending connector channel. The two terminals of each coil are connected according to a specific connection scheme.

主权项

1. A cylindrical linear motor, comprising:
a cylindrical rotor having eight poles, and a cylindrical stator comprising a winding having 36 coaxial toroidal coils of equal size forming a first basic winding and extending in a circumferential direction of the stator, with the toroidal coils arranged axially one behind the other, said stator having an axial connector channel, wherein each toroidal coil has a left-hand terminal and a right-hand terminal located in the connector channel, with the left-hand terminals being connected to the right-hand terminals as follows:
A(n*3+1)L to A(n*3+6)R, with the left-hand terminals being connected to the right-hand terminals AiR as follows:
A(n*3+3)L to A(n*3+5)L, and with the right-hand terminals being connected to the right-hand terminals as follows:
A(n*3+2)R to A(n*3+4)R, wherein A(i)L indicates the i-th left-hand terminal, A(i)R indicates the i-th right-hand terminal, and n=0 . . . 10 for all terminals, and wherein the terminals A2L, A1L, and A3R are each connected to a corresponding phase of a three-phase system, and the terminals A34L, A36L, and A35R are connected together at a star point.