Positioning force complementary double-stator cylindrical linear motor

Abstract

The invention discloses a positioning force complementary double-stator cylindrical linear motor; an inner stator ring or an outer stator ring comprises a permanent magnet and two circular U-shaped teeth which have the same structure and have the U-shaped grooves being towards a dynamic ring; the permanent magnets are excited along an axial direction and are clamped between the two circular U-shaped teeth; two sets of circular armature windings are inlaid in the two U-shaped grooves of the circular U-shaped teeth; the tooth pitch between the salient pole teeth of every two inner side surfaces on the inner side circular surface of the dynamic ring is the same with that between the salient pole teeth of every two outer side surfaces on an outer side surface of the dynamic ring, and all the salient pole teeth on the inner side surface and all the salient pole teeth on the outer side surface are staggered by one-fourth teeth pitch; the U-shaped groove width, the tooth width and the permanent magnet width of the circular U-shaped teeth of the inner stator ring and those of the circular U-shaped teeth of the outer stator ring are different; and the positioning force variation frequency on the inner side and that on the outer side of the dynamic ring are twice of reverse potential variation frequency, the positioning force on the inner side and on the outer side is complementary, and the positioning force is reduced.

Description

technical field [0001] The invention relates to a linear motor structure, in particular to a double-stator cylindrical linear motor, which is suitable for fields such as artificial heart pumps with limited space volume. Background technique [0002] In some special applications, such as the field of artificial heart pumps, the application space is very limited, and small-sized motors are required. Therefore, it is required to make full use of the limited space volume and increase the power density, which is the key to the design of this type of motor. [0003] Double-stator cylindrical linear motors generate greater thrust than ordinary cylindrical linear motors. At present, there are mainly two types of double-stator cylindrical linear motors: one is a double-stator cylindrical linear induction motor, the primary inner and outer stators are respectively located on the inner and outer sides of the mover, and both the stator and the mover are composed of iron cores. There ar...

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Problems solved by technology

The other is a double-stator cylindrical linear oscillating motor with transverse flux. Its two concentric stator core rings are placed side by side on the outside of the mover core. The disadvantage is that the axial length of the motor is increased, and compared with The structure of placing a stator in the hollow part of the mover has a low power density. In addition, the coils on each tooth corresponding to the two stators are connected in series, and a single stator winding cannot be controlled separately.

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