Power transmission device of natural energy recovery system

Abstract

The excessive rotation of an electric motor can be prevented with an easy and reliable constitution without relying upon a friction providing means. The power transmission device comprises the electric motor (Mo), a reduction gear (Go) connected to the electric motor (Mo) and having an output shaft (64A), and a fluid brake mechanism (FBo) which is installed in a power transmission path between the electric motor (Mo) and the output shaft (64A) of the reduction gear (Go) and in which a fluid increasing the rotational resistance of the power transmission path when the rotational speed of the output shaft (64A) is increased is used as a medium.

Description

technical field [0001] The invention relates to a power transmission device of a natural energy recovery system, in particular to a power transmission device of a natural energy recovery system with the function of preventing the motor from over-rotating speed. Background technique [0002] Among the wind power generators disclosed in Japanese Unexamined Patent Publication No. 2007-146858, there is disclosed a wind power generator equipped with a yaw control (azimuth control) mechanism. The yaw control mechanism is configured as follows: unit and make the windmill blade always face the wind direction so that the wind force can effectively act on the wing. This Japanese Patent Laid-Open No. 2007-146858 discloses the following technology: if the wind speed sensor detects a strong wind such as a typhoon, the friction brake installed on the motor is activated, and the rotation of the wind speed generating unit is fixed or braked to prevent the motor from of overspeed. [0003]...

AI Technical Summary

Problems solved by technology

[0007] In addition, in the technology disclosed in Japanese Patent Application Laid-Open No. 2005-113899, the above-mentioned friction brake is designed to operate, but this is only when the rotation is stopped, that is, when the state is temporarily stopped. During rotation, when a rotational force based on a strong gust of wind is applied in the same direction of rotation, since the friction brake was not designed to work from the beginning, there is also a problem that the motor directly enters a super high-speed rotation state and cannot fully respond.

[0008] In addition, the friction brake control formed in the above-mentioned Japanese Patent Laid-Open No. 2007-146858 and Japanese Patent Laid-Open No. 2005-113899 is a control in which the "control part" issues an electric or hydraulic control command based on the detection of a sensor or the like to operate the friction brake. So there are problems like low reliability

This is because, if such a large fluctuating load occurs from the beginning, if the weather or weather conditions that are very different from usual are considered, it can be considered that when the sensor fails due to storms or lightning strikes, or the control board of the control unit is flooded , or when the wiring is physically disconnected, the braking command itself that executes the braking cannot be issued

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