Low speed multiblade wind turbine
View Patent ↗A wind turbine for a region with an average wind speed of less than 5 m/s includes a rotor comprising a rotor hub and multiple blades connected to the rotor hub. The rotor is configured for rotation with a starting torque and a torque-magnitude-profile-over-time. Each blade has multiple sections distributed between a blade root and a blade tip, and each section has a chord length and an angle of twist. The chord length is a first non-dimensional value from 0 to 1 and the angle of twist is specified in radian. The first and second non-dimensional values are convertible to dimensional values in meters by multiplying the first non-dimensional values by a maximum chord length.
1. A wind turbine for a region with a yearly average wind speed of less than 5 m/s, comprising:
a rotor comprising a rotor hub wherein the rotor has a rotor diameter and is configured for rotation with a starting torque and a torque-magnitude-profile-over-time; and
a plurality of blades wherein each blade of the plurality of blades:
is connected to the rotor hub;
extends radially about the rotor hub;
has a blade root and a blade tip; and
has a plurality of sections distributed longitudinally between the blade root and the blade tip, wherein each section of the plurality of sections has a chord length and an angle of twist set forth in Table 5;
wherein the plurality of blades includes three or more blades;
wherein the chord length is a first non-dimensional value from 0 to 1 and the angle of twist is specified in radian; and
wherein the first non-dimensional value is convertible to a dimensional value in meters by multiplying the first non-dimensional value of the chord length.
2. The wind turbine of claim 1 , wherein the rotor diameter is about 5 meters.
3. The wind turbine of claim 2 , wherein the region with the yearly average wind speed of less than 5 m/s has the yearly average wind speed of about 3.56 m/s.
4. The wind turbine of claim 3 , wherein the starting torque of the rotor is greater than 25 N-m.
5. The wind turbine of claim 1 , wherein the torque-magnitude-profile-over-time of the rotor includes a slope, wherein the slope logarithmically increases over time during a first 10 seconds of rotation.
6. The wind turbine of claim 1 , wherein the maximum chord length is about 1.1 m.
7. A wind turbine for a region with a yearly average wind speed of less than 5 m/s, comprising:
a rotor comprising a rotor hub wherein the rotor has a rotor diameter and is configured for rotation with a starting torque and a torque-magnitude-profile-over-time; and
a plurality of blades wherein each blade of the plurality of blades:
is connected to the rotor hub;
extends radially about the rotor hub;
has a blade root and a blade tip; and
has a plurality of sections distributed longitudinally between the blade root and the blade tip, wherein each section of the plurality of sections has a chord length and an angle of twist set forth in Table 6;
wherein the plurality of blades includes three or more blades;
wherein the chord length is a first non-dimensional value from 0 to 1 and the angle of twist is specified in radian; and
wherein the first non-dimensional value is convertible to a dimensional value in meters by multiplying the first non-dimensional value of the chord length.
8. The wind turbine of claim 7 , wherein the rotor diameter is about 5 meters.
9. The wind turbine of claim 8 , wherein the region with the yearly average wind speed of less than 5 m/s has the yearly average wind speed of about 3.56 m/s.
10. The wind turbine of claim 9 , wherein the starting torque is greater than 25 N-m.
11. The wind turbine of claim 7 , wherein the torque-magnitude-profile-over-time includes a slope, wherein the slope logarithmically increases over time during a first 10 seconds of rotation.
12. The wind turbine of claim 7 , wherein the maximum chord length is about 1.1 m.