Linear permanent-magnet generator

Abstract

The invention discloses a linear permanent-magnet generator, which comprises a primary iron core, a primary coil, a secondary iron core and a non-magnetic material shaft. The primary iron core, the primary coil, the secondary iron core and the non-magnetic material shaft are arranged in turn from the outside to inside; the primary coil is wound on the interior of the primary iron core; the non-magnetic material shaft is embedded in the secondary iron core; and a permanent magnet of a Halbach array is also sleeved outside the secondary iron core, and the permanent magnet enhances the magnetic field outside the permanent magnet and weakens the magnetic field inside the permanent magnet. The Halbach permanent-magnet array is applied to the linear generator and has the advantages of improving the power density of the generator, improving the utilization rate of the permanent magnet and simultaneously reducing eddy-current loss in the secondary iron core; therefore, the structure of an electric motor is simplified, the electric motor runs more stably, and the volume and weight of the generator are reduced.

Description

technical field [0001] The invention belongs to the field of linear generators. In particular, it is a cylindrical linear generator, which can be used in new power generation technologies such as ocean wave power generation. Background technique [0002] With the decrease of coal, oil and other non-renewable energy sources and the increasing environmental pollution caused by them, people began to seek more clean and renewable energy sources to generate electricity. Wave energy is a clean, non-polluting, and inexhaustible source of energy. The ocean, which accounts for 71% of the earth's surface, contains about 50 billion kilowatts of energy, of which the wave energy is about 2.5 billion kilowatts. According to the estimate of the World Energy Council: the wave energy that can be developed every day exceeds 2×10 12 Watts, it is estimated that there are 17520×10 12 Watt-hours of wave energy are available for exploitation. And the wave energy that can be converted and util...

AI Technical Summary

Problems solved by technology

The power generation devices studied in the early stage all drive the rotating motor through the intermediate conversion device to generate electricity, which causes two major drawbacks to the wave generator: 1. Due to the existence of the intermediate mechanism, the structure of the generator is complicated and the body is bulky; 2. Due to the intermediate mechanism The energy loss in the medium, resulting in low power generation efficiency

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