| 摘要 |
<p>PURPOSE:To reduce torque fluctuation and drag fluctuation by forming rotor blades integrally with and spiral about the rotary shaft of the windmill. CONSTITUTION:The spiral rotor blades 11, 12 are arranged about the rotary shaft of the windmill, which connects the rotary shafts 16, 17, so as to be symmetrical to the shaft and so as to have the angles of twist of 180 deg.. The spiral rotor blades 11, 12 are fixed to respective end plates 13, 15 at the uppermost and lowermost section thereof. The ratio of areas of dynamic blade, receiving torque in a direction to rotate the windmill, and brake blade, receiving torque into the direction of braking, becomes constant independently from a rotating angle theta, therefore, there is little torque fluctuation. The area of projection of the windmill is also constant independently from the rotary angle theta and, therefore, the drag force, effecting on the whole of the windmill, will never be fluctuated substantially.</p> |
