JP3025108B2 - Traction drive gearbox for wind turbine generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traction drive gearbox for a wind turbine generator.

[0002]

2. Description of the Related Art FIG. 3 shows a wind turbine structure described in Japanese Patent Application No. 03-24167. In the figure, reference numeral 1 denotes a wing, which rotates in response to wind. This rotation is transmitted to the traction drive gearbox 2 via the blade input shaft 4 supported by the bearing 7 and transmitted to the generator 3 via the output shaft 5 to generate electric power. Here, the traction drive gearbox 2 and the generator 3
Is stored in the nacelle 6, which is attached to the top of the tower 8. Now, traction drive gearbox 2
Is, as shown in FIG. 4, a two-stage acceleration type directly connected two-up gear of the planetary roller type, rotation N _I blade input shaft 4
Is transmitted to the ring roller storage frame 10 in which the ring roller 9 of the one-stage gearbox is stored, and also rotates the sun shaft 12 via the planetary roller 11 of the one-stage gearbox. The rotation N _s of the sun shaft 12 becomes the input rotation of the two-stage gearbox side,
The output shaft 5 on the generator side is rotated at a predetermined speed increase ratio. The speed increase ratio is uniquely determined by the diameter ratio of each roller. It is determined by the normal force obtained by the fit and the traction coefficient between the rollers.

[0003]

In a wind turbine generator, a torque exceeding a design value may be generated due to a strong wind.
Equipment stability must be ensured against excessive torque. For such excessive torque, the conventional traction drive gearbox has the following problems. (1) When an external force greater than the design transmission torque acts, a large slip (slip) occurs between the rollers, causing damage such as galling and seizure. (2) If an attempt is made to transmit an abnormal external force torque that occurs infrequently, the speed increasing device becomes extremely large and heavy.
Not cost effective. (3) When a strong wind due to approaching a low pressure exceeds the design value, an anemometer detects this and there is a safety device to stop the power generator, but gusts accelerate the blades rapidly and generate excessive torque in a short time There is no protection device for the situation.

An object of the present invention is to solve the above-mentioned problems and to provide a compact traction drive intensifier for a wind turbine generator capable of ensuring safety against excessive torque.

[0005]

In view of the fact that an excessive load torque acts on the traction drive gearbox, the slip between the rollers increases, and the input shaft rotation speed N _I on the blade side is taken into consideration.
If the traction drive gearbox is shifting to an excessive slip state due to the slip rate obtained from the simultaneous measurement of the two points of the output shaft rotation speed No and the generator side, the generator is stopped as in the case of strong wind, and the compact Ensuring the safety of the traction drive gearbox with the same size.

It is to be noted that the generator stop for the excessive slip is determined first when the first set value is exceeded and the slip ratio increases with the passage of time.
Assume that the set value is exceeded.

[0007]

The traction drive gearbox has less noise and lower manufacturing cost than the gear system. However, when an excessive load torque that does not effectively contribute to power generation acts, a large slip occurs between the rollers constituting the traction drive, and if it is left as it is, a trouble such as galling or seizure occurs in a portion where the excessive slip occurs.

[0008] In contrast, according to the (Means for Solving the Problems), the input shaft rotational speed N _I and the output shaft speed No
The simultaneous measurement of the two points constantly monitors the magnitude of the slip rate (does not identify the part where the slip occurs), and reduces the generator load before reaching the slip state that may cause serious damage. It is possible to prevent trouble beforehand.

Further, it is not necessary to use excessive torque that does not contribute to power generation as a design condition of the traction drive gearbox, and a lightweight, compact, low-cost, low-noise windmill gearbox can be provided.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. In the figure, 2 is a traction drive gearbox, 3
Is a generator, 4 is an input shaft, 5 is an output shaft, 13 is a first stage gearbox, 14 is a second stage gearbox, 15 is an input shaft speed detector,
Reference numeral 16 denotes an output shaft rotation number detector, 17 denotes a rotation ratio meter, 18 denotes a calculator, 19 denotes a differentiator, and 20 denotes a comparator / determiner.

[0011] The rotational speed N _I of the input shaft 4 of the blade side is measured by the rotation speed detector 15 measures the rotational speed No of the output shaft 5 of the generator side in the rotational speed detector 16. And these signals are
After entering the arithmetic unit 18 through the rotation ratio meter 17, the slip ratio is calculated, and then the time fine value of the slip ratio is calculated by the differentiator 19. The determined values are compared and determined by the comparator / determiner 20, and when the threshold value is exceeded, a signal for setting the generator load to zero is issued. Here, the slip ratio S is represented by S = (1−No / N _I · 1 / i) × 100 (1) However, the first threshold value (first set value) set in advance is i = the speed increase ratio.
Traction coefficient as shown in is the slip ratio S ₁ as the maximum value. The second threshold value (second set value), the traction coefficient f _TD is the slip ratio S ₂ of the high-slip side obtained using the design of the traction drive speed increaser.

[0012]

According to the present invention, there is provided a traction drive gearbox for a wind turbine generator, wherein the traction drive gearbox is provided between a blade and a generator. A rotational speed detector provided for each of the shafts, and an arithmetic unit for calculating a slip ratio between the two shafts and a change in the slip ratio based on the rotational speeds detected by the two detectors, wherein the slip ratio is a first set value. The following effects are obtained by configuring the generator to have a load of zero when it exceeds the slip rate and increases with time and when the slip rate exceeds the second set value.

There is no need to use excessive torque that does not contribute to power generation as a design condition of the traction drive gearbox, and a lightweight, compact, low-cost, low-noise windmill gearbox can be realized. Therefore, it is possible to install a wind turbine generator in a high-quality wind energy generation area that could not be located due to noise problems. Further, since excessive torque does not act, the reliability and durability of the device are improved.

[Brief description of the drawings]

FIG. 1 is a block diagram for monitoring a slip ratio according to an embodiment of the present invention.

FIG. 2 is a diagram showing a relationship between a slip ratio and a traction coefficient.

FIG. 3 is a schematic diagram of a general wind turbine generator.

FIG. 4 is a longitudinal sectional view of a conventional planetary roller traction drive speed increasing device for wind turbine power generation.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

[Explanation of symbols]

 2 Traction Drive Gearbox 4 Input Shaft 5 Output Shaft 15 Input Shaft Revolution Detector 16 Output Shaft Revolution Detector 17 Rotation Ratio Meter 18 Computing Unit 19 Differentiator 20 Comparing / Determining Unit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-199955 (JP, A) JP-A-2-157483 (JP, A) JP-A-5-79450 (JP, A) JP-A 57-1999 208849 (JP, A) JP-A-61-112780 (JP, A) JP-A-63-25864 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02P 9/00 F16H 61 / 00 F16H 13/08

Claims (1)

(57) [Claims] 1. A wind turbine generator provided with a traction drive speed increasing device between a blade and a generator, wherein a rotation speed detector provided on each of an input shaft and an output shaft of the traction drive speed increasing device; An arithmetic unit for determining a slip ratio between both axes and a change in the slip ratio based on the number of revolutions detected by the detector, wherein the slip ratio exceeds a first set value and the slip ratio increases over time; and A traction drive intensifier for a wind turbine generator, wherein the load on the generator is reduced to zero when the slip ratio exceeds a second set value.