A ducted generator

Abstract

A ducted generator includes a housing and a main generator disposed within the housing. The housing includes a fan blade assembly connected to the main generator by transmission, and a rectifier and voltage-stabilizing module for rectifying and stabilizing the three-phase alternating current generated by the main generator into direct current. The housing includes a fan housing for accommodating the fan blade assembly, a thin-walled cylinder connected to the rear end of the fan housing, and an open cylinder connected to the rear end of the thin-walled cylinder. The stator assembly of the main generator is assembled within the thin-walled cylinder. A raised platform is connected to the outer wall of the open cylinder; the inner cavity of the raised platform is connected to the inner cavity of the open cylinder for accommodating the rectifier and voltage-stabilizing module. The front end of the thin-walled cylinder is connected to the fan housing via a plurality of reinforcing ribs; one end of the reinforcing rib is connected to the outer wall of the thin-walled cylinder, and the other end is connected to the inner wall of the fan housing. A fixing plate is provided at the upper opening of the raised platform; a socket for external electrical connection is provided on the fixing plate. The present invention integrates the mechanical structure and electrical structure of the motor into an integrated package, resulting in a small size, high integration, a large range of operating speed variations, and stable output direct current.

Description

Technical Field

[0001] The present invention belongs to the field of wind generator manufacturing, and in particular relates to a ducted generator. Background Art

[0002] Whether in the field of aviation power supply or industrial power generation, existing technologies for wind turbines, to meet the demand for wind-generated DC power, employ variable pitch control. Specifically, the blades rotate about their central axis, varying the blade angle of attack within a certain range to regulate the motor speed and output voltage within a certain range. However, variable pitch design is complex and requires cumbersome fixing methods, increasing the probability of failure. Furthermore, the limited blade rotation angle results in a narrow motor output range. This is particularly true for situations where the air density varies approximately three times, and the motor speed also varies approximately three times. The reliability of the variable pitch structure is low, impacting the efficiency of the wind turbine. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art and provide a ducted generator with an integrated motor mechanical structure and electrical structure, a small size and high integration, a large range of operating speed variation, and stable output DC power.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a ducted generator, including a shell and a main generator placed in the shell; the main generator includes a stator assembly and a rotor assembly.

[0005] The shell is provided with a fan blade assembly connected to the main generator in a transmission manner, and a rectification and voltage stabilization module for rectifying and stabilizing the three-phase alternating current generated by the main generator into direct current.

[0006] The shell comprises a wind cover for accommodating the fan blade assembly, a thin-walled cylinder connected to the rear end of the wind cover, and an open cylinder connected to the rear end of the thin-walled cylinder.

[0007] The stator assembly is assembled in the thin-walled cylinder.

[0008] The outer wall of the open cylinder is connected with a raised platform; the inner cavity of the raised platform is connected with the inner cavity of the open cylinder to accommodate the rectifier and voltage stabilization module.

[0009] A sealing partition is provided in the open cylinder to separate the inner cavity of the open cylinder from the inner cavity of the thin-walled cylinder; a bearing chamber is provided on the side of the partition facing the inner cavity of the thin-walled cylinder; a wire threading opening is provided between the inner cavity of the thin-walled cylinder and the inner cavity of the raised platform; the lead wire of the main generator passes through the wire threading opening and is electrically connected to the rectifier and voltage stabilization module.

[0010] The front end of the thin-walled cylinder is connected to the wind shield via a plurality of reinforcing ribs; one end of the reinforcing rib is connected to the outer wall of the thin-walled cylinder, and the other end is connected to the inner wall of the wind shield.

[0011] The rotor assembly includes a rotating shaft, a rotor core arranged on the rotating shaft, and magnetic steel.

[0012] An end cover is provided at the front end of the thin-walled cylinder; two angular contact bearings for positioning the rotating shaft are provided in the end cover, and a rear bearing for positioning the rotating shaft is provided in the sealed partition bearing chamber; the rear end of the rotating shaft is installed in the bearing chamber via the rear bearing.

[0013] It also includes a locking ring for transmission connection between the rotating shaft and the fan blade assembly.

[0014] The front end of the rotating shaft passes through two angular contact bearings, the fan blade assembly, the locking ring and is connected with the front nut.

[0015] A sealed rear cover is provided at the rear end of the open cylinder, and a sealed fixing plate is provided at the upper opening of the raised platform; a socket for external electrical connection is provided on the fixing plate.

[0016] The stator assembly includes a stator core and a stator winding.

[0017] The wind cover is cylindrical, and the central axis of the wind cover, the central axis of the thin-walled cylinder, and the central axis of the open cylinder are located in the same straight line.

[0018] The fan blade assembly includes a central tube and 12 blades evenly distributed along the circumference of the central tube.

[0019] Two angular contact bearings are installed face to face to bear radial loads and axial loads in two directions, thereby improving the bearing's load-bearing capacity.

[0020] The end cover is provided with a step hole; two angular contact bearings are installed in the step hole; and one side of the end cover is connected to a bearing end plate.

[0021] The front nut is a bullet head nut.

[0022] The rectifier and voltage stabilization module includes a circuit board that integrates a rectifier, a voltage stabilizer, and a DC / DC converter; the rectifier includes a three-phase rectifier circuit and a filter capacitor assembly for converting the three-phase AC power output by the generator into DC power; the voltage stabilizer includes a sampling circuit for sampling the DC voltage output from the filter capacitor assembly and a voltage stabilization control circuit for adjusting the full-wave or half-wave output of the generator to the input end of the DC / DC converter based on the DC voltage collected by the sampling circuit; the circuit board is a double-sided board, with the DC / DC converter arranged on one side of the circuit board and the electronic components of the rectifier and voltage stabilizer arranged on the other side of the circuit board; the circuit board has a square structure; the length of the circuit board is no more than 60 mm and the width is no more than 47 mm.

[0023] The three-phase rectifier circuit includes a field effect transistor Q1, a field effect transistor Q2, a field effect transistor Q3, a field effect transistor Q4, a field effect transistor Q5, and a field effect transistor Q6; the drains of the field effect transistors Q1, Q2, and Q3 are connected and connected to Vin+ of the DC / DC converter; the source S of the field effect transistor Q1 and the drain D of the field effect transistor Q4 are connected to the A-phase lead wire of the generator; the source S of the field effect transistor Q2 and the drain D of the field effect transistor Q5 are connected to the B-phase lead wire of the generator; the source S of the field effect transistor Q3 and the drain D of the field effect transistor Q6 are connected to the C-phase lead wire of the generator; the sources of the field effect transistors Q4, Q5, and Q6 are connected and connected to GND.

[0024] The field effect transistors Q1, Q2, Q3, Q4, Q5 and Q6 are all N-channel field effect transistors; and the outer dimensions of the N-channel field effect transistors are 5 mm*6 mm.

[0025] The filter capacitor assembly includes a filter capacitor C1 and a filter capacitor C2 connected in parallel. The positive electrode of the filter capacitor assembly is connected to the Vin+ terminal, and the negative electrode of the filter capacitor assembly is connected to the GND terminal.

[0026] Six N-channel field-effect transistors are used to form a three-phase full-wave / half-wave rectifier circuit to convert the three-phase AC power output by the generator into DC power. After filtering through two capacitors, it is output to the voltage stabilizing circuit. The voltage stabilizing circuit adjusts the full-wave / half-wave output of the generator by sampling the DC voltage, so that the rectified output voltage does not exceed the maximum input voltage of the DC / DC converter, so that the generator finally outputs a stable voltage.

[0027] The full-wave rectifier output and the input of the voltage regulator circuit are connected by printed wires on the circuit board, which can greatly save space compared to the connection between multiple independent modules using terminal posts and terminal lugs.

[0028] The three-phase lead wires of the generator are directly welded to the three-phase lead wire pads on the circuit board, which can greatly save space compared to the connection between the terminal posts and the terminal lugs.

[0029] The selected N-channel field-effect transistor has a withstand voltage of 250V and a current of 25A, with an external dimension of only 5mm*6mm. Diodes with the same withstand voltage and current are only available in DIP plug-in packages, with an external dimension of 34mm*15.5mm, which is much larger than 5mm*6mm. Using six N-channel field-effect transistor body diodes to form a three-phase full-wave / half-wave rectifier circuit can greatly save space.

[0030] The beneficial effects of the present invention are as follows: compared with the prior art, the rectifier and voltage-stabilizing module with an integrated rectifier and voltage-regulating circuit of the present invention integrates the mechanical structure and electrical structure of the motor into an integrated installation, and is compact; the rectifier and voltage-stabilizing module not only converts the AC power generated by the rotation of the main generator into the DC power required by the external power source, but also avoids the hidden danger of unstable voltage output caused by unstable wind speed when the fan rotates to generate electricity, thereby ensuring the stability of the output voltage; at the same time, the rectifier circuit can withstand a larger range of speed variations, and the corresponding operating speed range of the motor is also increased; BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is an exploded view of the ducted generator of the present invention;

[0032] Figure 2 This is a cross-sectional view of the bullet nut of the present invention;

[0033] Figure 3 This is a front view of the locking ring of the present invention;

[0034] Figure 4 This is a right side view of the locking ring of the present invention;

[0035] Figure 5 This is a front view of the fan of the present invention;

[0036] Figure 6 This is a left side view of the fan of the present invention;

[0037] Figure 7 This is a cross-sectional view of the end cover assembly of the present invention;

[0038] Figure 8 is a cross-sectional view of the end cover of the present invention;

[0039] Figure 9 is a three-dimensional diagram of the housing of the present invention;

[0040] Figure 10 This is a left side view of the housing of the present invention;

[0041] Figure 11 for Figure 9 AA cross-sectional view;

[0042] Figure 12 This is the second perspective view of the housing of the present invention;

[0043] Figure 13 This is a left side view of the rotor assembly of the present invention;

[0044] Figure 14 This is a front view of the rotor assembly of the present invention;

[0045] Figure 15 This is a front view of the back cover of the present invention;

[0046] Figure 16This is a left side view of the rear cover of the present invention;

[0047] Figure 17 It is a three-dimensional schematic diagram of the present invention;

[0048] Figure 18 is a cross-sectional view of the present invention;

[0049] Figure 19 This is the front view of the rectifier and voltage stabilizing module of the present invention;

[0050] Figure 20 This is a circuit diagram of the rectifier and voltage stabilization module of the present invention.

[0051] In the figure, 1, bullet head nut, 2, locking ring, 3, fan blade assembly (fan), 4, end cover assembly, 5, fan cover, 6, rotor assembly, 61, shaft, 7, bearing, 8, rectifier and voltage regulator module, 9, fixing plate, 10, socket, 11, back cover, 12, stator assembly; 101, left end matching end face, 102, internal matching nut, 103, right side bullet head arc surface; 201, locking ring and rotor assembly matching plane, 202, locking ring and rotor assembly matching circumferential surface, 203, locking ring and fan fixing protrusion, 204, lock The fixing end surface of the tightening ring and the bullet nut; 301, the fan weight reduction reinforcement rib, 302, the matching surface between the fan and the locking ring boss, 304, the matching end surface between the fan and the bearing; 401, the double bearing of the end cover assembly, 402, the fixing hole, 404, the double bearing position of the end cover, 405, the stopper, 407, the bearing end plate, 408, the screw, 409, the bushing, 410, the bolt; 501, the matching surface between the fan cover and the fan, 502, the bell mouth of the fan cover, 503, the matching mounting hole between the thin-walled cylinder and the end cover assembly, 504, the matching surface between the thin-walled cylinder and the stator assembly, 505, rear bearing position, 506, arc-shaped notch for fan hood outlet, 507, mounting hole for the opening cylinder and rear cover, 508, outlet boss, 509, reinforcing rib, 510, circuit board fixing position, 511, sealing plug, 512, through hole; 601, flattened surface for rotor assembly and locking ring, 602, thread for rotor assembly and bullet nut; 801, three-phase AC input phase A, 802, three-phase AC input phase B, 803, three-phase AC input phase C, 804, three-phase AC input neutral point, 805, DC output 2 8V+, 806, DC output 28V-, 807, circuit board and DC-DC power supply VCC, 808, circuit board and DC-DC grounding, 809, circuit board and DC-DC VIN, 810, circuit board and DC-DC 28V+, 811, circuit board and DC-DC 28V-; 1101, rear cover boss, 1102, fixing hole on the rear cover boss that cooperates with the open cylinder, 1103, stop 1 for the rear cover and the open cylinder, 1104, stop 2 for the rear cover and the open cylinder. DETAILED DESCRIPTION

[0052] Figure 1-18 As shown, a ducted generator includes a housing and a main generator disposed within the housing; the main generator includes a stator assembly 12 and a rotor assembly 6. The stator assembly 12 includes a stator core and a stator winding. The rotor assembly 6 includes a rotating shaft 61, a rotor core disposed on the rotating shaft, and magnets. The housing is provided with a fan blade assembly 3 connected to the main generator in a transmission manner, and a rectifier and voltage stabilization module 8 for rectifying and stabilizing the three-phase AC power generated by the main generator into DC power. The housing includes a cylindrical hood 5 for accommodating the fan blade assembly 3, a thin-walled cylinder 51 connected to the rear end of the hood 5, and an open cylinder 52 connected to the rear end of the thin-walled cylinder 51. A raised platform 53 is connected to the outer wall of the open cylinder 52. The inner cavity of the raised platform 53 is connected to the inner cavity of the open cylinder 52 to accommodate the rectifier and voltage stabilization module 8. The central axis of the hood 5, the central axis of the thin-walled cylinder 51, and the central axis of the open cylinder 52 are located in the same straight line.

[0053] The fan blade assembly 3 includes a central tube 31 and 12 blades 32 evenly distributed along the circumference of the central tube, which are used to rotate and generate electricity under the influence of external wind. The central axis of the central tube 31 is in the same straight line as the central axis of the wind cover 5. The central tube 31 includes a central hole connected to the rotating shaft and 12 weight-reducing ribs 301 for support. The central hole is designed to be a circular hole that matches the generator to ensure concentricity with the motor shaft installation and reduce mechanical losses; 12 weight-reducing ribs 301 are designed in the fan blade cavity to reduce weight while increasing the strength of the fan blades; 4 circumferentially symmetrical square grooves 302 are designed between the weight-reducing ribs, and the square grooves are used to fix with the four protrusions of the locking ring to ensure the firmness of the installation.

[0054] The end face of the locking ring 2 is designed with four circumferentially evenly distributed protrusions 203 for fixing with the square groove of the fan blade; the inner hole ensures concentricity with the main generator, and there are two U-shaped straight grooves 201 formed by wire cutting in the hole for fixing with the milled flat end of the main generator shaft to achieve mechanical transmission;

[0055] The bullet nut 1 is designed in the form of a streamlined bullet head to reduce air resistance; the thread is designed to be a reverse thread, and when the fan rotates counterclockwise and accelerates, the bullet nut 1 is tightened and fixed.

[0056] The main generator includes an end cover assembly, a stator assembly 12 , a rotor assembly 6 , and a bearing 7 ; at the same time, the rectifier and voltage stabilization module 8 is fixed inside the housing and sealed by a rear cover 11 .

[0057] The main generator's mid-end cover assembly consists of an end cover 4, two angular contact bearings 401, a bearing end plate 407, and screws 408. A bearing seat is designed on the right side of the end cover assembly for securely mounting the angular contact bearings. The two angular contact bearings are mounted face-to-face, capable of withstanding radial loads and axial loads in both directions, improving the bearing's load-bearing capacity. The bearing end plate 407 is assembled to the bearing end face via bolts 410, tightening the bearing axially. The end cover 4 is secured to the six mounting holes 503 in the thin-walled cylinder 51 via six screws 408 evenly spaced around the circumference. Through holes 512 are provided on the fan hood 5 at locations corresponding to the mounting holes 503 to facilitate tightening the screws 408.

[0058] A stop 405 is designed on the outer circumference of the end cover, and its size matches the size of the stator inner stop.

[0059] There is a bell-shaped wind shield 5 on the outside of the generator, and the cavity at the left end of the wind shield is designed as a bell-shaped mouth 502. The front end of the bell-shaped mouth can increase the air intake, and the rear end cavity cooperates with the fan blades; a thin-walled shell 51 with a slightly smaller diameter is designed at the rear end of the wind shield, and the thin-walled shell mainly cooperates with the stator assembly 12 to fix the stator assembly; six reinforcing ribs 509 are evenly distributed on the circumference of the outer circle of the thin-walled shell, and the other end of the reinforcing rib is connected to the inner cavity of the wind shield. The design of the reinforcing ribs reduces the weight of the entire wind shield while ensuring the strength of the motor housing and the wind shield, and connects the small-diameter thin-walled shell and the large-diameter wind shield cavity into one. The gap between the reinforcing ribs can be used as a channel for the fan blades to exhaust air. The wind blown out by the fan blades also takes away the heat from the surface of the main generator for heat dissipation of the main generator body.

[0060] The stator assembly consists of a stator core and stator winding. The stator winding adopts a star-shaped winding method, and the neutral point lead is led out together with the three-phase leads; the neutral point lead can be used for the rectifier and voltage stabilization module.

[0061] The thin-walled cylinder 51 is equipped with six mounting holes evenly spaced around its circumference. These six mounting holes correspond to the six fixing holes 402 on the end cap, and the center-to-center distance between these mounting holes matches that of the fixing holes on the end cap. To facilitate wiring, a wire threading opening (arc-shaped notch 506) is provided between the inner cavity of the thin-walled cylinder 51 and the inner cavity of the raised platform 53. This gap ensures that the three-phase and neutral lead wires can pass smoothly from the front housing to the rear end to connect with the circuitry. A sealing plug 511 with a threading hole is located at the arc-shaped notch 506. The interior of the housing is hollow, enclosing the rectifier and voltage regulator module. This not only integrates the mechanical and electrical components into a single structure, but also reduces weight, shortens the overall length of the motor, and improves the system's sealing and protection.

[0062] The left end of the rotor assembly shaft 61 is provided with a milled flat fixed to the locking ring, and the shaft end is designed with a thread, which cooperates with the bullet nut 1 to lock the fan.

[0063] Bearings are designed at the front and rear ends of the rotor assembly. The three-bearing design not only combines the internal dynamic structure of the motor (including the fan and the rotor assembly of the main generator) with the static structure (end cover, main generator housing assembly, rear cover, etc.), but also reduces the impact of increased motor length on concentricity.

[0064] The left end of the rear cover is designed with two inner stops 1103 and 1104 for positioning with the open cylinder; the rear cover is also designed with two square bosses 1101, which have threaded fixing holes that match the mounting holes on the shell assembly.

[0065] The rear end of the shell is a cavity with an elevated platform, in which a rectifier and voltage regulator module is installed.

[0066] The top of the raised platform 53 is equipped with a protruding flange 531 that facilitates the assembly of the fixing plate 9. The flange 531 has four mounting holes for the fixing plate 9, which is secured to the raised platform flange 531 via bolts. The distance between the lower end of the flange 531 and the central axis of the cylindrical hood 5 is greater than the outer diameter of the hood 5.

[0067] The rectifier and voltage regulator module is a circuit board with rectification and voltage regulation functions. It contains components such as a rectifier, voltage regulator, and DC / DC converter. The circuit board and DC-DC converter are mounted together using the solder holes shown in the diagram to ensure both mechanical and electrical connection.

[0068] like Figure 19 、 20 As shown, the rectifier and voltage regulator module 8 includes a circuit board that integrates a rectifier, a voltage regulator, and a DC / DC converter. The rectifier output and the voltage regulator input are connected by printed wires on the circuit board. The circuit board is a double-sided board, with the DC / DC converter (810) arranged on one side of the circuit board and the electronic components of the rectifier and voltage regulator arranged on the other side of the circuit board.

[0069] The rectifier includes a three-phase rectifier circuit and a filter capacitor assembly for converting the three-phase AC power output from the generator into DC power. The voltage regulator includes a sampling circuit for sampling the DC voltage output from the filter capacitor assembly and a voltage regulation control circuit for adjusting the full-wave or half-wave output of the generator to the input of the DC / DC converter based on the DC voltage collected by the sampling circuit. The voltage regulation control circuit can withstand fluctuations in air density and unstable speed.

[0070] The three-phase rectifier circuit includes a field effect transistor Q1 (818), a field effect transistor Q2 (806), a field effect transistor Q3 (808), a field effect transistor Q4 (805), a field effect transistor Q5 (807), and a field effect transistor Q6 (809). The filter capacitor assembly includes a filter capacitor C1 (813) and a filter capacitor C2 (814) arranged in parallel, with the positive electrode of the filter capacitor assembly connected to the Vin+ terminal and the negative electrode of the filter capacitor assembly connected to the GND terminal.

[0071] N-channel field effect transistor Q1 (818), N-channel field effect transistor Q2 (806), N-channel field effect transistor Q3 (808), N-channel field effect transistor Q4 (805), N-channel field effect transistor Q5 (807), N-channel field effect transistor Q6 (809), filter capacitor C1 (813), filter capacitor C2 (814), voltage stabilization control circuit (815), A phase lead wire (801), B phase lead wire (802), C phase lead wire (803), generator neutral line N lead wire (804), DC / DC converter (810), 28V+ lead wire (817), 28V- lead wire (816) are all integrated on the circuit board.

[0072] Among them, the field effect transistor Q1 (818), the field effect transistor Q2 (806), and the field effect transistor Q3 (808) are connected to the drain; the field effect transistor Q4 (805), the field effect transistor Q5 (807), and the field effect transistor Q6 (809) are connected to the source.

[0073] The gates of the field effect transistor Q1 (818), the field effect transistor Q2 (806), the field effect transistor Q3 (808), the field effect transistor Q4 (805), the field effect transistor Q5 (807), and the field effect transistor Q6 (809) are connected to the sources.

[0074] Field effect transistor Q1 (818), field effect transistor Q2 (806), and field effect transistor Q3 (808) are connected to a common drain; field effect transistor Q4 (805), field effect transistor Q5 (807), and field effect transistor Q6 (809) are arranged in parallel on the circuit board, and the middle pads of the field effect transistors are all cooled by nine vias on the circuit board.

[0075] Field effect transistors Q1 (818), Q2 (806), and Q3 (808) are connected to a common drain; the body diodes of field effect transistors Q4 (805), Q5 (807), and Q6 (809) form a three-phase full-wave / half-wave rectifier circuit, which converts the three-phase alternating current output by the generator into direct current. The voltage stabilization control circuit can withstand the situation where the air density changes and the speed is unstable.

[0076] The filter capacitor C1 (813) and the filter capacitor C2 (814) filter the rectified DC power and are connected to the Vin+ (811) and Vin- (812) pins of the DC / DC converter (10).

[0077] The sampling circuit (819) and the voltage stabilization control circuit (815) are both prior art. The main features of the rectifier and voltage stabilization module of the present invention are that a small MOS tube replaces a diode for rectification, saving space, and automatic full-wave / half-wave switching. The sampling circuit (819) samples the DC voltage after three-phase full-wave rectification and outputs it to the voltage stabilization control circuit (815). After receiving the output of the sampling circuit, the voltage stabilization control circuit (815) judges the voltage. When the sampling voltage exceeds the threshold, the control circuit disconnects Vin- (812) from GND and connects it to the generator neutral line N, so that the generator output is converted from full-wave rectification to half-wave rectification and output to the input end of the DC / DC converter (810); when the sampling voltage is lower than the threshold, the control circuit disconnects Vin- (812) from the generator neutral line N and connects it to GND, so that the generator output is converted from half-wave rectification to full-wave rectification and output to the input end of the DC / DC converter (810), so as to adapt to the input voltage range requirement of the DC / DC converter (810), thereby enabling the voltage stabilizer to output a stable 28V voltage.

[0078] The A-phase lead wire (801), the B-phase lead wire (802), the C-phase lead wire (803), and the generator neutral line N lead wire (804) are connected to the pads on the circuit board by welding.

[0079] During assembly of the ducted generator of the present invention, the rotor assembly is first placed within the housing assembly, followed by the end cap assembly. The outer stop of the end cap assembly mates with the inner stop on the housing assembly to ensure concentricity between the end cap assembly and the stator assembly. This design reduces mechanical losses caused by misalignment during operation. Six cross-slotted countersunk screws secure the end cap and housing assembly together, preventing circumferential movement of the ducted generator during operation. During rotor assembly, the fan boss mates with the inner bearing ring of the end cap assembly for axial positioning. The inner wire-cut square of the locking ring aligns with the milled flat on the shaft to provide radial locking. Four square chucks are provided on the outer end face to secure the fan within the slot. The outer bullet nut (1) is tightened by applying glue to the reverse thread of the shaft extension, securing the end face to the locking ring. During operation, the incoming air drives the fan to rotate, which in turn drives the locking ring. The rotation of the locking ring simultaneously rotates the shaft and the bullet nut (1). This not only transmits the fan's external rotational speed to the main generator, achieving mechanical transmission, but also effectively prevents relative motion between the fan and main generator shafts, improving transmission efficiency. Bearings at either end of the shaft mate with the bearing chambers in the end cap assembly on the left end and the bearing chambers on the partition on the right end, respectively, for shaft positioning and axial support. The circuit board is placed at the rear end of the housing, with the notch H2 on the circuit board aligned with the step H1 (i.e., the partition) inside the open cylinder. The partition, designed on the inner wall of the open cylinder, creates a step H1 that is lower than the circuit board notch and smaller than H2. This step not only strengthens the housing but also allows the circuit board to be positioned during assembly. The step is designed to be lower than the height of the solder joints in the notch, preventing electrical contact between components on the circuit board and the housing, potentially causing a short circuit. Thermally conductive adhesive is then applied to the entire circuit board area, preventing loosening of components on the circuit board while also improving heat dissipation, ensuring the board's rigidity and enhancing the reliability of the ducted generator. Finally, the mounting plate is secured to the raised platform using screws, flat washers, and lightweight spring washers.

[0080] In addition to converting the AC power generated by the main generator into DC power for external use, the rectifier and voltage regulator module also needs to stabilize the voltage within the required range within a certain speed range to ensure output voltage stability. Because the motor's operating speed range varies significantly with incoming current velocity and altitude, and to ensure the minimum output voltage (after rectification) at low speeds, the motor's output voltage (after rectification) can exceed 62V at high speeds. To prevent the DC / DC input voltage from exceeding the maximum 62V at high motor speeds, the circuit board incorporates a control circuit that automatically switches from full-wave rectification to half-wave rectification. This means that at low motor speeds, the DC / DC input voltage (the circuit board's output voltage) is provided by the motor's three-phase full-wave rectification. When the full-wave rectified voltage reaches a set threshold (e.g., 54V), the DC / DC input voltage automatically switches to the motor's three-phase half-wave rectification. This calculation ensures that the DC / DC input voltage meets the specification requirements throughout the motor's operating speed range, effectively preventing damage to the DC / DC module caused by excessive input voltage at high motor speeds. When in use, the fan and the generator run coaxially to achieve energy transfer; the rectifier and voltage stabilizing module are electrically connected through welding methods such as soldering; and mechanical fixation is achieved through connection methods such as stoppers, screws, and nuts.

[0081] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A ducted generator comprising a housing and a main generator disposed within the housing; the main generator comprising a stator assembly (12) and a rotor assembly (6); characterized in that: The housing is provided with a fan blade assembly (3) connected to the main generator in a transmission manner, and a rectifying and voltage stabilizing module (8) for rectifying and stabilizing the three-phase alternating current generated by the main generator into direct current; the housing comprises a wind shield (5) for accommodating the fan blade assembly (3), a thin-walled cylinder (51) connected to the rear end of the wind shield (5), and an open cylinder (52) connected to the rear end of the thin-walled cylinder (51); a stator assembly (12) is assembled in the thin-walled cylinder (51); an outer wall of the open cylinder (52) is connected to a raised platform (53); the raised platform (53) The inner cavity is connected to the inner cavity of the open cylinder (52) to accommodate the rectifier and voltage stabilizing module (8); a partition (54) is provided in the open cylinder (52) for separating the inner cavity of the open cylinder (52) from the inner cavity of the thin-walled cylinder (51); a bearing chamber (505) is provided on the side of the partition (54) facing the inner cavity of the thin-walled cylinder; a threading hole is provided between the inner cavity of the thin-walled cylinder (51) and the inner cavity of the raising platform (53); the main generator lead wire passes through the threading hole and is electrically connected to the rectifier and voltage stabilizing module (8); the thin-walled cylinder (51) The front end is connected to the wind shield (5) via a plurality of reinforcing ribs (509); one end of the reinforcing rib (509) is connected to the outer wall of the thin-walled cylinder (51), and the other end is connected to the inner wall of the wind shield (5); the rotor assembly includes a rotating shaft (61), a rotor core arranged on the rotating shaft, and a magnetic steel; the front end of the thin-walled cylinder (51) is provided with an end cover (4); two angular contact bearings (401) for positioning the rotating shaft (61) are provided in the end cover (4), and a rear bearing for positioning the rotating shaft (61) is provided in the bearing chamber (505) of the sealing partition (54). (7); the rear end of the rotating shaft (61) is mounted in the bearing chamber (505) via the rear bearing (7); and further comprises a locking ring (2) for connecting the rotating shaft (61) to the fan blade assembly (3); the front end of the rotating shaft (61) passes through two angular contact bearings (401), the fan blade assembly (3), the locking ring (2) and is connected to the front nut (1); the rear end of the open cylinder (52) is provided with a rear cover (11), and the upper opening of the raising platform (53) is provided with a fixing plate (9); the fixing plate (9) is provided with a socket (10) for external electrical connection.

2. The ducted generator according to claim 1, wherein: The wind hood (5) is cylindrical, and the central axis of the wind hood (5), the central axis of the thin-walled cylinder (51), and the central axis of the open cylinder (52) are located on the same straight line.

3. The ducted generator according to claim 1, wherein: The fan blade assembly (3) comprises a central cylinder (31) and 12 blades (32) evenly distributed along the circumference of the central cylinder.

4. The ducted generator according to claim 1, wherein: The two angular contact bearings (401) are mounted face to face to bear radial loads and axial loads in two directions, thereby improving the bearing capacity.

5. The ducted generator according to claim 1, wherein: The end cover (4) is provided with a stepped hole; two angular contact bearings (401) are installed in the stepped hole; and a bearing end plate (407) is connected to one side of the end cover (4).

6. The ducted generator according to claim 1, wherein: The front nut (1) is a bullet head nut.

7. The ducted generator according to claim 1, wherein: The rectifier and voltage stabilization module (8) includes a circuit board integrating a rectifier, a voltage stabilizer, and a DC / DC converter; the rectifier includes a three-phase rectifier circuit and a filter capacitor component for converting the three-phase alternating current output by the generator into direct current; the voltage stabilizer includes a sampling circuit for sampling the direct current voltage output from the filter capacitor component, and a voltage stabilization control circuit for adjusting the full-wave or half-wave output of the generator to the input end of the DC / DC converter according to the direct current voltage collected by the sampling circuit; the circuit board is a double-sided board, the DC / DC converter is arranged on one side of the circuit board, and the electronic components of the rectifier and the voltage stabilizer are arranged on the other side of the circuit board; the circuit board is a square structure; the length of the circuit board is not more than 60 mm, and the width is not more than 47 mm.

8. The ducted generator according to claim 7, characterized in that: The three-phase rectifier circuit includes a field effect transistor Q1, a field effect transistor Q2, a field effect transistor Q3, a field effect transistor Q4, a field effect transistor Q5, and a field effect transistor Q6; the drains of the field effect transistors Q1, Q2, and Q3 are connected and connected to Vin+ of the DC / DC converter; the source S of the field effect transistor Q1 and the drain D of the field effect transistor Q4 are connected to the A-phase lead wire of the generator; the source S of the field effect transistor Q2 and the drain D of the field effect transistor Q5 are connected to the B-phase lead wire of the generator; the source S of the field effect transistor Q3 and the drain D of the field effect transistor Q6 are connected to the C-phase lead wire of the generator; the sources of the field effect transistors Q4, Q5, and Q6 are connected and connected to GND.

9. The ducted generator according to claim 8, characterized in that: The field effect transistors Q1, Q2, Q3, Q4, Q5 and Q6 are all N-channel field effect transistors; and the outer dimensions of the N-channel field effect transistors are 5 mm*6 mm.

10. The ducted generator according to claim 7, characterized in that: The filter capacitor assembly includes a filter capacitor C1 and a filter capacitor C2 connected in parallel. The positive electrode of the filter capacitor assembly is connected to the Vin+ terminal, and the negative electrode of the filter capacitor assembly is connected to the GND terminal.

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