Mechanical braking system of variable-pitch motor

Abstract

According to the mechanical braking system of the variable-pitch motor, a fixed disc surrounds a rotating shaft of a motor assembly and is fixedly arranged at an end cover of the motor assembly; the movable disc is slidably arranged on the rotating shaft through an internal spline, and corresponding tooth groove structures are arranged on the opposite faces of the movable disc and the fixed disc. A check ring is arranged on the rotating shaft on the outer side of the movable disc; on the inner side of the movable disc, the rotating shaft is provided with a spring of which the end part is propped against the movable disc along the axial direction; the shifting spring is linked by the shifting shaft, used for pushing the movable disc to slide along the rotating shaft from the outer side face of the movable disc and matched with the fixed disc through a tooth groove structure. The movable disc and the rotating shaft are locked by the fixed disc through a tooth groove structure; the shifting spring is rotated through the shifting shaft, and then the movable disc is shifted to slide along the rotating shaft to be meshed with and separated from the fixed disc. The separation is realized by the elastic force of the spring. The shifting shaft is driven by a gear motor through a shaft head, a transmission gap between the movable disc and the fixed disc is detected by a position sensor, and positioning of the movable disc is achieved through power on and power off of the gear motor.

Description

Technical Field

[0001] This invention relates to a braking system, specifically a mechanical braking system for a pitch motor, belonging to the technical field of wind power pitch systems. Background Technology

[0002] With the rapid development of the wind power industry, more and more pitch motors are being used in wind turbine pitch systems. As the core actuator of the pitch system, the pitch motor drives the pitch gearbox and transmission mechanism, ultimately rotating the blades. Ensuring that the pitch motor can reliably and quickly stop and remain stationary when needed is crucial for ensuring safe wind turbine operation, preventing runaway accidents, and protecting the mechanical structure from impact damage. Especially in emergency situations such as grid failures or control system malfunctions, the pitch system must be able to independently, safely, and effectively perform feathering actions or maintain a feathered position. In these situations, the reliability of the braking system directly affects the overall safety of the wind turbine.

[0003] Currently, the main braking solutions applied to pitch motors include: spring-loaded mechanical brakes, hydraulic brakes, and electric brakes.

[0004] Among them, spring-loaded mechanical brakes are the most widely used. Their principle is to use spring force to push friction pads against the brake disc (usually fixed to the motor shaft), generating braking torque to achieve braking; when energized, electromagnetic force overcomes the spring force, causing the friction pads to separate and releasing the brake. However, in practical applications, they still face many challenges and shortcomings, especially including spring reliability issues, friction material stability, brake temperature rise and heat dissipation issues, braking status monitoring, maintenance complexity, and weight and cost issues.

[0005] Therefore, developing a new type of pitch motor mechanical braking system that is more reliable, easier to maintain, has condition monitoring capabilities, and is lightweight and low-cost is of urgent technical demand and significant engineering value for improving the operational safety, reliability, and availability of wind turbine generators and reducing the total life-cycle maintenance costs. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a mechanical braking system for a pitch motor.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A mechanical braking system for a pitch motor includes a fixed plate, a moving plate, and a deflector spring; The rotating shaft of the fixed disc ring motor assembly is fixed to the end cover of the motor assembly; The moving disk is slidably sleeved on the rotating shaft via an internal spline, and has a corresponding toothed groove structure on the opposite side of the fixed disk; a retaining ring is provided on the rotating shaft on the outer side of the moving disk; and a spring is fitted on the rotating shaft on the inner side of the moving disk to press against the moving disk along the axial direction and at its end. The spring is linked to the pivot shaft and is used to push the moving plate along the pivot shaft from the outer side of the driven plate. It engages with the fixed plate through the toothed structure.

[0008] The aforementioned dial is mounted on the brake housing and is driven by the shaft of the geared motor.

[0009] Furthermore, the aforementioned brake housing is equipped with a resolver and a resolver connector. The resolver is used to monitor the speed signal of the rotating shaft and transmit it through the resolver connector; the signal is used to drive the geared motor.

[0010] Furthermore, the aforementioned geared motor includes a position sensor and a low-voltage connector; The position sensor is used to control the position of the moving plate by recording the position of the spring; The low-voltage connector is used to switch the power supply to the geared motor on and off according to the feedback from the position sensor, so as to fix the position of the moving plate.

[0011] Furthermore, the aforementioned resolver is sealed by a resolver cover plate.

[0012] The advantages of this invention are: The present invention discloses a mechanical braking system for a pitch motor. Through a toothed structure, a fixed plate locks the moving plate and the rotating shaft. A deflector shaft rotates a spring, which in turn causes the moving plate to slide along the rotating shaft, achieving engagement and disengagement with the fixed plate. Disengagement is achieved by the spring force. The deflector shaft is driven by a geared motor via a shaft head. The transmission gap between the moving and fixed plates is detected by a position sensor, and the positioning of the moving plate is achieved by energizing and de-energizing the geared motor.

[0013] The mechanical braking system of the pitch motor of the present invention has a simple structure, is easy to use and maintain, has condition monitoring capabilities, achieves lightweight and low cost, and has strong practicality and wide applicability. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the external structure of a mechanical braking system.

[0015] Figure 2 This is a schematic diagram of a mechanical braking system.

[0016] Figure 3 This is an assembly drawing of the geared motor and braking system (left view A1, right view A2).

[0017] Figure 4 This is a schematic diagram of the transmission clearance C.

[0018] Figure 5 This is a schematic diagram of the structure of the fixed plate (B1) and the moving plate (B2).

[0019] The meanings of the markings in the attached diagram are as follows: Motor assembly 1, shaft 11, bearing 12, end cover 13, high voltage connector 14; Braking mechanism 2, spring 20, fixed plate 21, moving plate 22, brake housing 23, resolver connector 24, retaining ring 25, resolver 26, deflector spring 27, resolver cover plate 28, deflector shaft 29, fixed plate tooth groove 221, moving plate tooth groove 231, internal spline 232. Gear motor 3, position sensor 31, low-voltage connector 32, transmission clearance C. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0021] A mechanical braking system for a pitch motor comprises a braking mechanism 2 and a geared motor 3. The braking mechanism is attached to and acts on the motor assembly 1.

[0022] The motor assembly includes a rotating shaft 11, a bearing 12, and an end cover 13 connected to the braking mechanism; wherein the bearing is installed inside the end cover, and the rotating shaft is connected to the braking mechanism through the end cover. The braking mechanism 2 is installed on the outside of the end cover.

[0023] The braking mechanism 2 consists of a spring 20, a fixed plate 21, a moving plate 22, a brake housing 23, a retaining ring 25, a deflector spring 27, and a deflector shaft 29.

[0024] The fixed disc ring shaft is fixedly mounted on the end cover. The moving disc is designed with internal splines, which are mounted on the rotating shaft 11 and match the spline teeth on the surface of the rotating shaft 11. Through the internal spline 232, the moving disc can slide axially along the rotating shaft, and the rotating shaft 11 can drive the moving disc 22 to rotate.

[0025] On the outer side of the moving plate, a retaining ring 25 is fixed on the rotating shaft 11 to limit the moving plate; on the inner side of the moving plate, the rotating shaft is equipped with a spring that presses against the moving plate along the axial direction and at its end; through the elastic force of the spring, a transmission gap C is formed between the moving plate and the fixed plate.

[0026] That is, the moving disc can slide and compress the spring on the rotating shaft. When the spring is compressed, the transmission gap C becomes smaller and can be less than 0. When the spring rebounds, the transmission gap C is greater than 0.

[0027] The opposing surfaces of the moving plate and the fixed plate are provided with matching tooth groove structures: when the transmission clearance C is less than 0, the tooth groove of the fixed plate and the tooth groove of the moving plate are coupled to each other, the moving plate is locked by the fixed plate, the shaft is braked and cannot rotate; when the transmission clearance is greater than 0, the tooth groove 221 of the fixed plate and the tooth groove 231 of the moving plate are disengaged, the moving plate is unlocked, and the shaft can rotate freely.

[0028] The rotational clearance C between the moving plate and the fixed plate is controlled by a spring. The spring 27 is fixed on the pivot shaft 29. Rotating the pivot shaft drives the spring to press against the moving plate, causing the moving plate to slide on the pivot shaft and compress the spring 20. The compression of the moving plate by the spring makes the transmission clearance C less than 0. When the spring moves away from the moving plate, the spring will spring the moving plate back to the retaining ring limit position, at which point the transmission clearance is greater than 0.

[0029] The derailleur is mounted on the brake housing 23 and is driven by the geared motor 3.

[0030] The geared motor includes a position sensor, a low-voltage connector, and a shaft. The geared motor is mounted on the brake housing and energized via the low-voltage connector. The shaft drives the shift shaft to compress or release the shift spring from the moving disc. The position sensor records the shift spring position to control the transmission clearance C.

[0031] The brake housing is also equipped with a resolver and a resolver connector. The resolver monitors the motor shaft speed signal and transmits the signal through the resolver connector. The resolver is sealed by a resolver cover plate.

[0032] When the motor assembly needs to brake, the motor assembly controls the speed to 0 speed through the control device. When the resolver monitors the shaft speed and it is near 0, it controls the geared motor to drive the shift shaft to rotate. The shift spring rotates with the shift shaft and presses the moving plate onto the fixed plate. At this time, the transmission clearance C is less than 0. The moving plate is locked onto the fixed plate through the tooth groove. The position sensor records the position of the shift spring and feeds back the position signal. The low-voltage connector is de-energized, the geared motor stops working, and the shaft brakes with the moving plate, and the motor is locked.

[0033] When the motor assembly needs to be braked and released, the geared motor drives the shift shaft to rotate, the shift spring disengages from the moving plate, and the spring pushes the moving plate back to the retaining ring. At this time, the transmission clearance C is greater than 0, and the moving plate and the shaft can rotate freely. The position sensor records the position of the shift spring and feeds back the position signal, and the motor assembly is powered on and rotates. After the resolver monitors the shaft speed signal, the low-voltage connector is de-energized, the geared motor stops working, and the shaft rotates with the moving plate, and the motor rotates freely.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A mechanical braking system for a pitch motor, characterized in that, It includes a fixed plate (21), a moving plate (22), and a detacher spring (27); The fixed plate (21) rings the rotating shaft (11) of the motor assembly and is fixed to the end cover (13) of the motor assembly; The moving disk (22) is slidably sleeved on the rotating shaft (11) via an internal spline (232), and has a corresponding toothed groove structure on the opposite side of the fixed disk (21); a retaining ring (25) is provided on the rotating shaft on the outside of the moving disk; and a spring (20) is fitted on the rotating shaft on the inside of the moving disk to press against the moving disk along the axial direction and at the end. The spring (27) is linked by the pivot shaft (29) and is used to push the driven disc (22) to slide along the pivot shaft (11) from the outer side of the driven disc (22), and engages with the fixed disc (21) through the toothed structure.

2. The system according to claim 1, characterized in that, The dial (29) is mounted on the brake housing and is driven by the shaft of the geared motor (3).

3. The system according to claim 2, characterized in that, The brake housing is equipped with a resolver and a resolver connector. The resolver is used to monitor the speed signal of the rotating shaft (11) and transmit it through the resolver connector. The signal is used to drive the geared motor (3).

4. The system according to claim 3, characterized in that, The geared motor (3) includes a position sensor (31) and a low-voltage connector (32); The position sensor (31) is used to control the position of the moving plate (22) by recording the position of the spring; The low-voltage connector (32) is used to switch the power supply of the geared motor (3) on and off according to the feedback of the position sensor (31) to fix the position of the moving plate (22).

5. The system according to claim 3, characterized in that, The resolver is sealed by a resolver cover plate (28).

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