Symmetric type direct drive ocean current generator set with large ratio of length to diameter

Abstract

The invention discloses a symmetric type direct drive ocean current generator set with a large ratio of length to diameter. The symmetric type direct drive ocean current generator set is characterized in that an inner stator winding is wound on an inner stator hollow supporting shaft; outer rotor magnetic steel covers the outer side wall of an outer rotor rotating bracket; the outer rotor rotating bracket sleeves the inner stator hollow supporting shaft through a water-lubricating bearing sleeve; an impeller is fixedly mounted on the outer surface of the outer rotor magnetic steel; an output cable is placed in the hollow part of the inner stator hollow supporting shaft; one end of the output cable is connected with the output end of the inner stator winding, and the other end of the output cable penetrates out of the hollow supporting shaft and is connected with an external electric power receiving end; a filter screen used for filtering water flow is arranged at the end part of the outer rotor rotating bracket. According to the symmetric type direct drive ocean current generator set with the large ratio of length to diameter, the stress state of the device is improved, the reliability is improved, the radial dimension at the same power is effectively reduced, the flow stopping effect is reduced, the flow field characteristics are optimized, and the efficiency is improved; besides, the ratio of length to diameter is increased, the heat dissipation performance is better, and the expansion of the power level of the generator set is facilitated.

Description

technical field [0001] The invention belongs to an ocean current generator set in the field of new energy power generation, and in particular relates to a symmetrical direct-drive ocean current generator set with a large length-to-diameter ratio. Background technique [0002] As a kind of marine renewable energy, ocean current energy has the advantages of rich resources, high energy density, and strong regularity, so it has become a subject frontier and research hotspot that scientists attach importance to. But so far, domestic and foreign research has mostly focused on the commercial application of ocean current (or tidal current or ocean current) energy at high and medium velocity. In fact, the annual average velocity of currents in my country's vast sea areas, such as the East China Sea, most of the South China Sea, and the coast of the Jiaodong Peninsula, is only about 1m / s, and even less than 0.5m / s in some periods. In addition, these current energy utilization power g...

AI Technical Summary

Problems solved by technology

The flow field at low flow rate is unstable, the energy density is relatively low, and it is easy to be damaged. The radial flow increases due to the large radial size and large blocking area, which will inevitably destroy the flow field characteristics.

On the other hand, the radial size is large, and there may be no problem with heat dissipation on a 100-watt low-power unit, but when the power of the unit rises to a certain level, the internal stator has a large radial size, and the heat dissipation problem is bound to become prominent

In short, the existing direct-drive power generation devices are not conducive to the large-scale development of power levels

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