Variable pole pitch long primary bilateral linear induction motor

Abstract

The invention discloses a primary bilateral linear induction motor with variable pole distance and long distance, which is used as a driving power source by electromagnetic ejection from aircraft carrier aircraft. During the initial design, processing and manufacture of the motor, the pole distance of the manufacturing motor is different at different ejection displacements. The pole distance can be continuously changed or the pole distance can be changed in stages. The manufacturing process can be processed by CNC machine tools. During the ejection process of the carrier-based aircraft, there is no need to detect the ejection speed or ejection displacement, and the current frequency and magnitude of the primary coil winding remain unchanged, optimizing the ejection control method. The structure of the invention can solve the problem of limited frequency of the inverter, reduce the loss of the linear motor in the ejection process of the carrier aircraft, improve the efficiency of the linear motor, and simplify the control mode of the linear motor.

Description

technical field [0001] The invention relates to the technical field of electromagnetic ejection of carrier-based aircraft, in particular to a long primary bilateral linear induction motor used as a linear drive system. Background technique [0002] At present, the linear motors driven by electromagnetic ejection at home and abroad mainly use long primary bilateral linear induction motors. The structure of the motor is simple, the secondary mass is small, the manufacturing and operating costs are low, the operation is safe and reliable, and the switching frequency of the high-power switching device of the inverter is low, so it can be better applied to the electromagnetic ejection system of the carrier aircraft. [0003] However, the linear induction motors used for driving electromagnetic ejection are all constant-pole-pitch linear motors. By changing the current frequency of the primary winding, the magnitude of the electromagnetic thrust is changed to control the ejection ...

AI Technical Summary

Problems solved by technology

Furthermore, with the continuous increase of the ejection speed, the current frequency required by the traditional fixed-pole long-distance primary bilateral linear induction motor continues to increase, and the frequency of the inverter must be limited. The increase of the current frequency at high speeds will increase the loss of the motor.

Images