Generator without coupling of rotating speed and generating frequency
By decoupling the rotational speed and generation frequency through a full-power converter, a stable power supply for the shaft-driven generator was achieved, solving the problem of unstable generation frequency and improving the stability and economy of the ship's power system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-04-07
AI Technical Summary
Existing shaft-driven generators with coupled rotational speed and power generation frequency cause unstable power generation frequency in ships, affecting normal equipment operation, increasing equipment costs and maintenance difficulty, and reducing energy utilization efficiency.
The system employs a full-power converter to decouple the speed and generation frequency, and connects to the ship's power grid via the full-power converter. It includes a machine-side filter, a phase-advancing converter, a DC circuit, an outgoing converter, and a grid-side filter, along with control units and auxiliary units, to achieve stable power conversion and monitoring.
It provides a stable power supply, improves the stability and reliability of the ship's power system, reduces equipment costs and maintenance difficulty, and enhances energy utilization efficiency.
Smart Images
Figure CN224097551U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of generator, concretely is a kind of rotational speed and power generation frequency uncoupling generator. BACKGROUND
[0002] In the ship power system, shaft generator is an important power generation equipment, which uses the shafting rotating mechanical energy of ship main engine to generate electricity, and provides power support for the ship. The rotational speed of the traditional shaft generator is closely coupled with the power generation frequency, which means that the change of the rotational speed of the ship main engine will directly lead to the change of the power generation frequency of the generator, and the fluctuation of the rotational speed of the generator will directly lead to the instability of its power generation frequency.
[0003] During actual navigation, the rotational speed of the main engine is affected by various factors, such as different navigation conditions (sailing, cruising, docking, etc.), external environment (wind, waves, water flow, etc.), making it difficult to maintain constant rotational speed. Due to the coupling of rotational speed and power generation frequency, the power generation frequency will be unstable, which has obvious defects in many applications that require high stability of power, for example, unstable frequency will affect the normal operation of various electrical equipment on the ship, reduce the service life of the equipment, and even cause equipment failure. Lighting systems, communication equipment and various power equipment on the ship require high stability of power supply frequency, and frequency fluctuation may cause flickering, communication interruption and abnormal operation of power equipment.
[0004] In addition, in order to cope with the instability of power generation frequency, the ship has to be equipped with additional frequency stabilization equipment, which not only increases the complexity of the ship power system, but also increases the cost and maintenance difficulty of the equipment. At the same time, the energy consumption of additional equipment also reduces the overall energy utilization efficiency of the ship.
[0005] In summary, the existing rotational speed and power generation frequency coupled shaft generator has many drawbacks in practical application, and cannot meet the needs of efficient and stable operation of the ship. SUMMARY
[0006] The utility model aims at providing a kind of rotational speed and power generation frequency uncoupling generator, to solve the problem that the existing rotational speed and power generation frequency coupled shaft generator has many drawbacks in practical application, and cannot meet the needs of efficient and stable operation of the ship as proposed in the above background.
[0007] In order to achieve the above object, the utility model provides the following technical scheme: a kind of rotational speed and power generation frequency uncoupling generator, including generator main shaft and its fixed generator rotor, the outside of the generator rotor is covered with the generator stator coaxial with it, the generator stator is electrically connected with full-power converter, in turn is electrically connected with ship power grid;The motor main shaft is ship main shaft;The generator rotor includes rotor iron core that is sleeved on the motor main shaft, permanent magnet is penetrated in the inside of the rotor iron core;The full-power converter includes converter shell, power unit, control unit, auxiliary unit are arranged in the inside of the converter shell.
[0008] Preferably, the rotor iron core includes rubber antiskid layer that is coated on the motor main shaft, two semicircular annular iron core half rings are provided on the outside of the rubber antiskid layer, the two ends of the two iron core half rings are provided with axially outwardly extending and semicircular tubular fixed shaft pipe, the junction of the two semicircular tubular fixed shaft pipes is integrally fixed by bolt, a plurality of axially arranged iron core grooves are uniformly arranged on the outer wall of the two semicircular annular iron core half rings, and a permanent magnet is penetrated in each iron core groove;A magnet baffle is sleeved on the outside of the circular pipe formed by the two fixed shaft pipes, and the magnet baffle is also provided in two halves, and through holes are uniformly arranged on the magnet baffle, and iron core threaded holes coaxial with the through holes are arranged on the two side circular surfaces of the rotor iron core, and the magnet baffle and the rotor iron core can be connected into an integral whole by using bolts.
[0009] Preferably, the generator stator includes two groups of bearings that are sleeved on the motor main shaft and located on the outside of the two fixed shaft pipes, the upper and lower sides of the two bearings are respectively provided with a generator upper shell and a generator lower shell, and the junction of the generator upper shell and the generator lower shell is integrally connected by bolt, the bottom of the generator lower shell is provided in the cabin by using generator support, and stator iron cores are fixedly arranged on the inner walls of the generator upper shell and the generator lower shell, the stator iron cores are arranged in a circular ring shape, and stator windings are penetrated in the stator iron cores, the stator windings are electrically connected with a junction box arranged at the top of the generator upper shell, and the junction box is electrically connected with the full-power converter.
[0010] Preferably, the power unit includes machine-side filter, phase advancer, direct-current circuit, outcoming converter and grid-side filter electrically connected in sequence between the junction box and ship power grid.
[0011] Preferably, the control unit includes a controller and is electrically connected to the leading-phase converter and the outgoing-phase converter; the control unit also includes a current sensor connected in series with the leading-phase converter and the outgoing-phase converter, a voltage sensor connected in parallel with the leading-phase converter and the outgoing-phase converter, and a temperature sensor, wherein the current sensor, the voltage sensor and the temperature sensor are electrically connected to the controller.
[0012] Preferably, the auxiliary unit includes a power supply circuit and a protection circuit electrically connected to the control unit.
[0013] Compared with the prior art, the beneficial effects of this utility model are:
[0014] 1. This utility model achieves decoupling between the rotational speed and the generating frequency of the shaft-driven generator through a full-power converter. This makes the generator's generating frequency unaffected by fluctuations in the rotational speed of the ship's main shaft, enabling it to provide stable and high-quality electrical energy to the ship's power grid, effectively improving the stability and reliability of the ship's power system, and meeting the stable power requirements of various electrical equipment on board.
[0015] 2. The rotor and stator of the shaft-driven generator both adopt a two-half structure, which makes installation and maintenance convenient;
[0016] 3. The complete full-power converter configuration can efficiently convert and filter the electrical energy output from the generator, ensuring that the power quality output to the ship's power grid meets the requirements and reducing the impact of harmonics on the power grid; the control unit monitors the working status of the converter in real time, realizing precise control of the converter, improving the stability and reliability of the system, and responding in a timely manner when abnormal situations occur to protect equipment safety.
[0017] 4. The shaft-driven generator provided by this utility model has a compact overall structure and is easy to install. It can effectively utilize ship space and reduce the space occupied by ship equipment. Its efficient and stable power generation performance and perfect protection and control functions reduce the operating and maintenance costs of the ship's power system and improve the economy and safety of ship operation. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of this utility model;
[0019] Figure 2 A schematic diagram of the generator rotor and magnet baffle;
[0020] Figure 3 This is a schematic diagram of the generator stator;
[0021] In the diagram: Motor spindle-1, Generator rotor-2, Rotor core-21, Rubber anti-slip layer-211, Core half-ring-212, Fixed shaft tube-213, Core groove-214, Magnet baffle-215, Through hole-216, Core threaded hole-217, Permanent magnet-22, Generator stator-3, Bearing-31, Generator upper housing-32, Generator lower housing-33, Stator core-34, Stator winding-35, Junction box- 36, Full-power converter - 4, Converter housing - 41, Power unit - 42, Machine-side filter - 421, Leading-phase converter - 422, DC circuit - 423, Outgoing-phase converter - 424, Grid-side filter - 425, Control unit - 43, Controller - 431, Current sensor - 432, Voltage sensor - 433, Temperature sensor - 434, Auxiliary unit - 44, Power supply circuit - 441, Protection circuit - 442. Detailed Implementation
[0022] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments.
[0023] Please refer to Figures 1-3 , Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 A schematic diagram of the generator rotor and magnet baffle; Figure 3 This is a schematic diagram of the generator stator.
[0024] This utility model provides a generator with uncoupled speed and power generation frequency. By decoupling the speed and power generation frequency of the shaft-driven generator, the power generated by the decoupled shaft-driven generator remains at a constant voltage and can be directly connected to the ship's power grid for use by the ship's electrical equipment. It includes a generator main shaft 1, on which a generator rotor 2 that can rotate synchronously is fixed. A generator stator 3 coaxial with the generator rotor 2 is covered on the outside of the generator rotor 2. The generator stator 3 is electrically connected to a full-power converter 4, and is electrically connected to the ship's power grid through the full-power converter 4.
[0025] The motor spindle 1 is the ship's main shaft. A shaft-driven generator is installed on the ship's main shaft to convert the ship's surplus kinetic energy into electrical energy and supply power to the ship's electrical grid, thereby saving the ship's fuel.
[0026] The generator rotor 2 includes a rotor core 21 sleeved on the motor main shaft 1, and a permanent magnet 22 is inserted inside the rotor core 21;
[0027] The rotor core 21 includes a rubber anti-slip layer 211 covering the motor spindle 1. The rubber anti-slip layer 211 ensures the rotor core 21 is securely fixed, allowing it to rotate synchronously with the motor spindle 1. Two semi-circular iron core half-rings 212 are arranged on the outer side of the rubber anti-slip layer 211. Each end of the two iron core half-rings 212 has an axially extending, semi-circular tubular fixing shaft tube 213. The joint of the two semi-circular tubular fixing shaft tubes 213 is bolted together, thus forming a circular rotor core from the two semi-circular iron core half-rings 212. The outer walls of the two semi-circular iron core half-rings 212 are annularly... Multiple axially arranged iron core grooves 214 are evenly distributed, and a permanent magnet 22 is inserted into each iron core groove 214. In addition, a magnet baffle 215 is sleeved on the outside of the circular tube composed of two fixed shaft tubes 213. The magnet baffle 215 is also arranged in two halves, and through holes 216 are evenly distributed in a ring on the magnet baffle 215. The two annular surfaces of the rotor iron core 21 are provided with iron core thread holes 217 coaxial with the through holes 216. The magnet baffle 215 can be connected to the rotor iron core 21 as a whole by bolts, so that the axial movement of the permanent magnet 22 can be prevented by the limitation of the two magnet baffles 215.
[0028] The generator stator 3 includes two sets of bearings 31 sleeved on the motor main shaft 1 and located on the outside of the fixed shaft tubes 213 on both sides. The upper and lower sides of the two bearings 31 are respectively provided with the upper generator housing 32 and the lower generator housing 33. The upper generator housing 32 and the lower generator housing 33 are bolted together. The bottom of the lower generator housing 33 is set in the cabin by a generator bracket. The inner walls of the upper generator housing 32 and the lower generator housing 33 are fixedly provided with stator cores 34. The stator cores 34 are arranged in a ring shape and stator windings 35 are passed through the stator cores 34. The stator windings 35 are electrically connected to the junction box 36 located on the top of the upper generator housing 32 and are electrically connected to the full-power converter 4 through the junction box 36.
[0029] The full-power converter 4 includes a converter housing 41, and a power unit 42, a control unit 43, and an auxiliary unit 44 are arranged inside the converter housing 41.
[0030] The power unit 42 includes a generator-side filter 421, a phase-advancing converter 422, a DC circuit 423, an outgoing converter 424, and a grid-side filter 425, which are sequentially and electrically connected between the junction box 36 and the ship's power grid. The generator-side filter 421 is used to reduce the output voltage variation rate and improve the electrical stress borne by the generator. The phase-advancing converter 422 is used to convert the alternating current with varying frequency and voltage output from the generator into direct current. The DC circuit 423 is used to smooth the DC voltage and reduce current ripple of the converted DC voltage to ensure DC voltage stability and provide a stable DC power supply for subsequent inverters. The outgoing converter 424 is used to invert the stabilized DC voltage into alternating current with the same voltage and frequency as the grid and connect it to the grid. The grid-side filter 425 is used to filter out high-frequency harmonics in the grid-connected current, prevent converter switching noise from polluting the grid, and also prevent grid harmonics from entering the converter.
[0031] The control unit 43 includes a controller 431, which serves as the control center of the full-power converter 4 and is electrically connected to the leading-phase converter 422 and the output-phase converter 424. The controller 431 coordinates the operation of the leading-phase converter 422 and the output-phase converter 424 to ensure the stable operation of the full-power converter 4 and efficient power conversion. The control unit 43 also includes a current sensor 432 connected in series with the leading-phase converter 422 and the output-phase converter 424, a voltage sensor 433 connected in parallel with the voltage sensor 433 and the temperature sensor 434, respectively. The current sensor 432, the voltage sensor 433, and the temperature sensor 434 are electrically connected to the controller 431.
[0032] The auxiliary unit 44 includes a power supply circuit 441 and a protection circuit 442 electrically connected to the control unit 43. The power supply circuit 441 provides a stable DC power supply to the control unit 43. The protection circuit 442 has functions such as overcurrent protection, overvoltage protection, undervoltage protection, and overheat protection. When the converter malfunctions, it quickly cuts off the circuit or takes corresponding protective measures to prevent damage to power devices and other components, thereby improving the reliability and stability of the system.
[0033] Although embodiments of the present invention have been shown and described, it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, it will be understood by those skilled in the art that all other embodiments obtained by making various changes, modifications, substitutions and alterations to these embodiments without departing from the principles and spirit of the present invention and without creative effort are within the scope of protection of the present invention.
Claims
1. A generator with uncoupled rotational speed and generating frequency, characterized in that: The system includes a generator main shaft (1) and a generator rotor (2) fixed thereon. A generator stator (3) is coaxially mounted on the outside of the generator rotor (2). The generator stator (3) is electrically connected to a full-power converter (4) and then electrically connected to the ship's power grid. The generator main shaft (1) is the ship's main shaft. The generator rotor (2) includes a rotor core (21) sleeved on the generator main shaft (1). A permanent magnet (22) is inserted inside the rotor core (21). The full-power converter (4) includes a converter housing (41). A power unit (42), a control unit (43), and an auxiliary unit (44) are arranged inside the converter housing (41).
2. The generator with uncoupled rotational speed and generating frequency according to claim 1, characterized in that: The rotor core (21) includes a rubber anti-slip layer (211) covering the motor spindle (1). Two semi-circular iron core half-rings (212) are provided on the outer side of the rubber anti-slip layer (211). Both ends of the two iron core half-rings (212) are provided with axially extending, semi-circular tubular fixed shaft tubes (213). The joint of the two semi-circular tubular fixed shaft tubes (213) is bolted together. Multiple axially arranged iron core grooves (214) are evenly distributed in a ring on the outer wall of the two semi-circular iron core half-rings (212). A permanent magnet (22) is inserted into a core groove (214); a magnet baffle (215) is sleeved on the outside of a circular tube composed of two fixed shaft tubes (213), and the magnet baffle (215) is also set in two halves, and through holes (216) are evenly distributed in a ring on the magnet baffle (215), and core thread holes (217) coaxial with the through holes (216) are provided on both sides of the rotor core (21), so that the magnet baffle (215) and the rotor core (21) can be connected as one unit by bolts.
3. The uncoupled generator of rotational speed and generating frequency according to claim 2, characterized in that: The generator stator (3) includes two sets of bearings (31) sleeved on the motor main shaft (1) and located on the outside of the fixed shaft tubes (213) on both sides. The upper and lower sides of the two bearings (31) are respectively provided with the upper housing (32) and the lower housing (33). The upper housing (32) and the lower housing (33) are bolted together. The bottom of the lower housing (33) is set in the cabin by a generator bracket. The inner walls of the upper housing (32) and the lower housing (33) are fixedly provided with stator cores (34). The stator cores (34) are arranged in a ring shape and stator windings (35) are passed through the stator cores (34). The stator windings (35) are electrically connected to the junction box (36) set on the top of the upper housing (32) and are electrically connected to the full power converter (4) through the junction box (36).
4. The generator with uncoupled rotational speed and power generation frequency according to claim 3, characterized in that: The power unit (42) includes a machine-side filter (421), an incoming phase converter (422), a DC circuit (423), an outgoing phase converter (424), and a grid-side filter (425) that are electrically connected in sequence between the junction box (36) and the ship's power grid.
5. The uncoupled generator of rotational speed and generating frequency according to claim 4, characterized in that: The control unit (43) includes a controller (431) and is electrically connected to the leading-phase converter (422) and the outgoing-phase converter (424); the control unit (43) also includes a current sensor (432) connected in series with the leading-phase converter (422) and the outgoing-phase converter (424), a voltage sensor (433) connected in parallel with the leading-phase converter (422) and the outgoing-phase converter (424), and a temperature sensor (434), the current sensor (432), the voltage sensor (433) and the temperature sensor (434) are electrically connected to the controller (431).
6. The uncoupled generator of rotational speed and generating frequency according to claim 5, characterized in that: The auxiliary unit (44) includes a power supply circuit (441) and a protection circuit (442) that are electrically connected to the control unit (43).