Long stroke constant acceleration line electromotor and its control method

Abstract

A long-stroke constant acceleration straight-line motor as well as a relevant control method, relates to the field of motors and control thereof. The invention resolves the problem in the prior constant acceleration straight line motors that the primary coil current is difficult to be controlled in the low speed section. The invention comprises a stator and a mover; wherein, the stator comprises a primary iron core and a primary coil; the motor is in a long-primary and short-secondary structure; the primary iron core and the primary coil in the stator is divided into a plurality of segments in the movement direction; each segment is also separated into a plurality of stages, and each stage is a separate unit; the separate unit can be controlled separately; the slot number, the tooth shape and the dimensions of primary iron cores in each stage are identical in each segment; total cross section area of conductors of the primary coil in each slot is the same; in adjacent segments in the movement acceleration direction of the mover, the number of serial connection turns of each phase of the primary coil increases successively; but the cross section area of the coil conductor decreases successively. The inventive motor structure can also lower power consumption, capacity and cost of driving systems, and improve the efficiency and the reliability thereof.

Description

technical field [0001] The invention relates to a long-stroke linear motor running at constant acceleration and a control method thereof, belonging to the field of motors. Background technique [0002] Typical applications of linear motors with long strokes and constant acceleration include trains driven by linear motors (subway trains, high-speed maglev trains), and electromagnetic ejection of aircraft carriers. When the train leaves or enters the station, it is generally necessary to control the train to accelerate or decelerate with a constant acceleration; and when the carrier-based aircraft uses an electromagnetic catapult to take off from the ship, it also needs to apply a constant thrust (acceleration) to the aircraft. In order to improve the propulsion efficiency, the linear motors used in these occasions usually adopt a structure with a fixed primary (armature) and a moving secondary, and the primary is divided into several sections, each of which is controlled sepa...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the primary winding current in the low-speed section is difficult to control in the existing constant-acceleration linear motor, the present invention provides a long-stroke constant-acceleration linear motor and its control method

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