Fault Tolerant Primary Permanent Magnet Vernier Linear Motor

Abstract

The invention discloses a fault-tolerate primary permanent magnetic vernier linear motor, which is applied to the field of high-reliability linear driving and comprises a primary winding, a secondary winding and an armature winding; the secondary winding is a simple salient pole structure with ladder-shaped teeth and is longer than the primary winding, an air gap exists between the primary and secondary windings, armature teeth with even number are uniformly distributed on the primary winding, a set of concentrated winding is wound on each armature tooth, a fault-tolerate tooth is arranged between adjacent two armature teeth, a permanent magnet with the magnetizing direction being parallel to the central symmetrical axis of the armature is attached to the lower face of each armature tooth, the permanent magnets are uniformly distributed on each armature tooth, the magnetizing direction of each permanent magnet is in N-S and S-N alternative arrangement, and the magnetizing directions of the permanent magnets on all armature tooth are same in arranging sequence; and the height of the fault-tolerate tooth is equal to the sum of the heights of the armature tooth with the face being attached to the permanent magnetic and the permanent magnet. The fault-tolerate primary permanent magnetic vernier linear motor is simple in structure, large in pushing force, small in pushing force pulse, high in reliability and strong in the running property of the motor with the fault and fault-tolerate property.

Description

technical field [0001] The invention relates to a primary permanent-magnet vernier linear motor, which can be used in high-reliability and high-efficiency linear motion fields such as rail transportation and low-speed high-thrust. Background technique [0002] Linear motor is a kind of transmission device that directly converts electrical energy into mechanical energy of linear motion without any intermediate conversion mechanism, so it has obvious advantages over traditional transmission methods, such as simple structure, no wear, high precision, and high efficiency. Therefore, linear motors are more and more widely used. [0003] At present, linear drive technology is gradually being applied to rail transit. The linear induction motor has a simple mechanical structure, but its working efficiency is relatively low, and it is also sensitive to changes in the air gap; compared with the electric excitation linear motor, the permanent magnet linear motor has higher efficiency,...

AI Technical Summary

Problems solved by technology

At present, most permanent magnet vernier motors use 3-phase armature windings, and the fractional slot double-layer concentrated winding structure with the number of slots per pole and each phase q=1 / 2. This structure is easy to saturate the magnetic density of the armature teeth of the motor. Thereby reducing the use efficiency of permanent magnets and reducing the back EMF of the motor

Secondly, the double-layer concentrated winding does not have high fault tolerance performance, resulting in a high degree of coupling between phases. When a phase fails, the magnetic field of the other two normal phases will be seriously affected by the magnetic field generated by the faulty phase, resulting in system failure. Cannot operate normally, does not have the ability to operate with faults, and has poor fault tolerance

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