초록 ▼

When a wind velocity sensor detects a wind velocity higher than a predetermined level, a timer device starts a waiting timer function during an operation timer period shorter than the waiting timer period. After the waiting timer period is over, the waiting timer function is switched to an operation

When a wind velocity sensor detects a wind velocity higher than a predetermined level, a timer device starts a waiting timer function during an operation timer period shorter than the waiting timer period. After the waiting timer period is over, the waiting timer function is switched to an operation timer function, and a switching relay switches a generator to a motor only during an operation timer period. Then, a driving circuit performs a start assisting rotation. After the operation timer period is over, the waiting timer period re-starts. This process is repeated. When during this period, the number of rotations of a rotor monitored by a rotation number measuring device, based on the output voltage Vm of a three-phase conduction coil exceeds a predetermined number of rotations, the charging of a battery by a three-phase generator is started.

대표청구항 ▼

The invention claimed is: 1. A lift type fixed pitch horizontal windmill, comprising:a short-circuit unit for short-circuiting output of a generator and making a blade of the windmill continue to rotate slowly, when wind blows at speed exceeding an operational limit; anda determination unit for dete

The invention claimed is: 1. A lift type fixed pitch horizontal windmill, comprising:a short-circuit unit for short-circuiting output of a generator and making a blade of the windmill continue to rotate slowly, when wind blows at speed exceeding an operational limit; anda determination unit for determining whether to re-start the windmill when a short-circuit current becomes less than a predetermined threshold value by comparing the short-circuit current generated by said short-circuit unit with the predetermined threshold value.