A linear homopolar motor and its control method

Abstract

The invention discloses a linear homopolar motor and a control method, which belong to the field of motors. The motor includes: a primary iron core, a secondary iron core, an armature winding, an excitation coil and a guiding coil; the primary iron core consists of k "E" characters Shaped iron cores are connected in sequence, k≥2, k "E" shaped iron cores are aligned along the connection direction, the distance between adjacent "E" shaped iron cores is equal, and the distance between adjacent "E" shaped iron cores Grooves are formed between the middle core arms, and the ends of the core arms on both sides of the "E"-shaped core are bent toward the inside; the secondary core is composed of multiple segmented cores, and the gap between two adjacent segmented cores is The distances are equal, and an equal-length air gap is formed between the secondary iron core and the primary iron core; the armature winding is arranged in (k‑1) grooves in the primary iron core; the excitation coil is wound on the primary iron On the core; the guide coil is wound on the core arms on both sides of the primary core. The invention enables the motor to integrate the functions of propulsion, suspension and guidance, and reduces the cost of the motor.

Description

technical field [0001] The invention belongs to the field of motors, and more specifically relates to a linear homopolar motor and a control method. Background technique [0002] In recent years, due to the advantages of high efficiency, low noise and fast speed, maglev trains have attracted widespread attention. Maglev trains often use linear synchronous motors or linear induction motors as drive motors. Linear induction motors are simple in structure and low in cost, but their power factor is low, requiring the use of large vehicle-mounted inverters, which increases the weight of the train; and when the speed increases, the thrust of linear induction motors is seriously attenuated, so they are only suitable for medium and low speed applications. Linear synchronous motors have high control precision and no obvious thrust attenuation, and are suitable for high-speed applications; however, the track needs to be laid with a large number of windings or permanent magnets, which...

AI Technical Summary

Problems solved by technology

The linear induction motor has a simple structure and low cost, but its power factor is low, and it needs to be used in conjunction with a large vehicle-mounted inverter, resulting in an increase in the weight of the train; and when the speed increases, the thrust of the linear induction motor is severely attenuated, and it is only suitable for medium and low speed applications.

The linear synchronous motor has high control precision and no obvious thrust attenuation, which is suitable for high-speed occasions; however, the track needs to lay a large number of windings or permanent magnets, which is expensive

In addition, the existing maglev trains often use additional suspension and guidance devices to achieve stable and controllable suspension and guidance functions, and the cost is relatively high

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