Low-speed high-thrust-density linear motor

Abstract

The invention relates to a low-speed high-thrust-density linear motor which comprises a motor short primary and a motor long secondary arranged opposite to the motor short primary, wherein an air gap (5) is reserved between the motor short primary and the motor long secondary; the motor short primary comprises a stator core (1), stator teeth (3) uniformly distributed at the periphery of the stator core (1), a stator winding (2) and stator permanent magnets (4); the stator core (1) is of an open slot stator structure, i.e., the stator core (1) is provided with a stator slot (8), the stator permanent magnets (4) are uniformly distributed between every two adjacent stator teeth (3), and the stator winding (2) is inserted into the stator slot (8); the motor long secondary comprises an active cell yoke (7) and active cell permanent magnets (6); and the active cell permanent magnets (6) are embedded into the active cell yoke (7) alternately and equidistantly in a horizontal direction. In the low-speed high-thrust-density linear motor provided by the invention, the magnetic modulation rings in a magnetic gear are replaced by the stator teeth, thereby simplifying the machining process, improving the reliability of the device and reducing the system manufacturing cost.

Description

technical field [0001] The invention relates to a novel magnetic field modulation type permanent magnet direct drive linear motor, which can realize low speed and high thrust density, and belongs to the technology of linear motors. Background technique [0002] Permanent magnet synchronous linear motors have outstanding advantages such as simple structure, fast response, good follow-up, and maintenance-free, and are widely used in high-performance linear drive systems. However, it also has the obvious disadvantage of large thrust fluctuation amplitude, which directly affects positioning and trajectory tracking accuracy, and brings about motion stability problems at low speeds. The usual speed regulation measures can only obtain low speed without increasing the torque, which limits the improvement of the performance of the permanent magnet synchronous linear motor and the expansion of the application field. Traditionally, a gearbox is used as an intermediate link for speed r...

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Problems solved by technology

[0003]Technical problem: This invention aims at the relatively low thrust density of traditional linear motors at low speeds, and proposes a low-speed, high-thrust density linear motor to solve the problem of existing transmission devices In order to solve the problems of low power density, mechanical wear and noise of the mechanical speed-increasing gearbox, at the same time, the double air gap mechanism of the new magnetic gear composite motor is improved, and the magnetic adjustment fixed parts composed of magnetic conductive blocks and non-magnetic materials are omitted. And the permanent magnets are embedded between the stator teeth. The content of the present invention is designed around the low-speed and high-thrust density operation performance of the linear motor

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