Fault-tolerance permanent magnet linear motor

Abstract

The invention discloses a fault-tolerance permanent magnet linear motor, which is applied to the field of linear driving with high reliability and high efficiency. The fault-tolerance permanent magnet linear motor comprises a stator, a mover and armature windings, wherein the length of the mover is smaller than that of the stator, a plurality of armature teeth are uniformly distributed on the stator at intervals, the armature windings are wound on the armature teeth, a set of armature windings is arranged in a tooth groove of each armature tooth, an insulation tooth is arranged between every two adjacent armature teeth, permanent magnets are pasted and arranged on the end parts of the armature teeth, the height of the insulation teeth is larger than that of the armature teeth pasted and provided with the permanent magnets, and the mover is in a projected electrode shape formed by a mover iron core and a plurality of mover teeth. The invention has the advantages of simple structure, high power density and high reliability, and is favorable for reducing the tooth groove force of the motor. Physical isolation, heat isolation and magnetic circuit decoupling exist between phases of the motor, the permanent magnets are favorable for heat dissipation, and the motor has strong fault operation and fault-tolerance performance.

Description

technical field [0001] The invention relates to a permanent magnet linear motor in the field of electric engineering and motor technology, which is applied to the field of high reliability and high efficiency linear drive such as artificial heart and electromagnetic gun. Background technique [0002] Linear motor is an additional device that can realize direct transmission without converting rotary motion into linear motion. It can eliminate various positioning errors caused by intermediate links, improve the positioning accuracy of the entire system, simplify the structure of the system, and reduce the system. weight and volume. [0003] At present, there are two types of linear motors commonly used: one is an electric excitation motor based on a linear induction motor, and its defects are: the power factor, power density and efficiency are not high; the other is a permanent magnet linear synchronous motor. The main permanent magnet motor, compared with the linear inductio...

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Problems solved by technology

[0003] At present, there are two types of linear motors commonly used: one is an electric excitation motor based on a linear induction motor, and its defects are: the power factor, power density and efficiency are not high; the other is a permanent magnet linear synchronous motor. The main permanent magnet motor, compared with the linear induction motor, has a high force index, small size, light weight, and has the function of generating brake. It has the dual advantages of both the permanent magnet motor and the linear motor, but its defect is: fault tolerance Poor performance, unable to meet the high requirements of high reliability and continuous operation, such as artificial heart, electromagnetic gun, etc.

[0005] The primary permanent magnet linear motor with double salient pole structure is a new type of permanent magnet linear motor that has appeared in recent years. This type of motor combines many advantages of the rotary stator permanent magnet motor and the linear motor, and has a simple structure, low manufacturing cost, High efficiency; but on the other hand, the primary permanent magnet linear motor adopts the traditional structure of 2 sets of windings per slot, and short-circuit faults between phase windings may occur, and its magnetic flux path forms a loop through adjacent phases, resulting in a large mutual inductance between phases , when one of the phases fails, it will affect the normal operation of the other non-faulty phases of the motor

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