Marine propulsion water-cooling permanent magnet synchronous motor

Abstract

The utility model relates to a marine propulsion water-cooling permanent magnet synchronous motor, which comprises a water-cooling circulation system, a permanent magnet energy conversion system, a temperature measurement protection device and a detection limiting device, wherein the water cooling circulation system comprises a front end cover, a stainless steel joint, a stainless steel corrugated pipe, a base and a rear end cover; the permanent magnet energy conversion system comprises a motor permanent magnet rotor, a junction box and a motor stator; the temperature measurement protection device comprises an electric brush device, a winding thermodetector, a winding moisture-proof heating belt and a bearing thermodetector; the detection limiting device comprises a connecting plate, a power-off brake, a connecting disc, an encoder and a protective cover. According to the utility model, the weak magnetic performance of the permanent magnet motor is better in terms of physical design; the back electromotive force is sinusoidal as much as possible, the influence of the motor back electromotive force harmonic on the driving system is reduced, and the control precision of the whole control system is improved; energy is saved, and long-term operation cost is reduced; and the motor has relatively high power density, so that the material utilization rate of the motor is optimal.

Description

Technical Field

[0001] The utility model relates to the technical field of marine motors, in particular to a marine propulsion water-cooled permanent magnet synchronous motor. Background Art

[0002] Permanent magnet synchronous motors have the advantages of high efficiency and energy saving, high power factor, low vibration, low noise, small size and light weight compared to similar asynchronous motors. They can directly drive the load, simplify the equipment transmission chain, improve system efficiency, reduce mechanical loss and extend equipment life. The external characteristic efficiency curve of permanent magnet synchronous motors is higher than that of asynchronous motors not only when running at full load, but also more than 20% higher than that of synchronous motors when running at light load.

[0003] Based on the above advantages of permanent magnet synchronous motor, especially in the current national "energy conservation and emission reduction" background, its application prospects are extremely broad. The design adopts optimized electromagnetic scheme and compact structure, with high power and high power density of permanent magnet motor as the main development direction.

[0004] High-performance permanent magnet motors are the basis for achieving mechatronics. The combination of power electronics technology, microelectronic control technology and permanent magnet synchronous motor technology has catalyzed a number of new and high-performance mechatronics products. The development of small, light, high-power-density marine propulsion water-cooled permanent magnet synchronous motors for promotion and application on green ships has a good development prospect and is the main development direction of marine motors.

[0005] The prior art has the following problems regarding permanent magnet motors:

[0006] 1. Speed-regulating permanent magnet synchronous motor (PMSM) is the main power source of modern AC servo control systems. PMSM needs to have the characteristics of low-speed high torque output, strong overload capacity and wide speed regulation range, while also reducing weight and noise to improve drive efficiency. However, when the motor output power is constant, in the constant torque speed regulation stage below the rated speed, the increase in low-speed torque will inevitably lead to a decrease in the rated speed. Since weak magnetic control is required above the rated speed, if the maximum speed remains unchanged, the weak magnetic speed regulation range of the motor will also increase accordingly; therefore, the weak magnetic speed regulation capability of PMSM is of great significance to improving the performance of marine propulsion motor drive systems; however, the existing technology for improving the weak magnetic speed regulation performance of PMSM drive systems mainly focuses on optimizing the weak magnetic control algorithm;

[0007] 2. Cogging torque is one of the unique problems of permanent magnet motors. It is a key problem that must be considered and solved in the design and manufacture of high-performance permanent magnet motors. The interaction between the permanent magnet and the slotted armature core in the permanent magnet motor inevitably produces cogging torque, which leads to torque fluctuations, vibrations and noise, and affects the control accuracy of the system.

[0008] 3. Since the vector control system of the permanent magnet synchronous motor needs to detect the precise position of the rotor and give the phase current according to the sinusoidal current waveform based on the position of the rotor, the rotor position detection accuracy directly determines the control accuracy of the motor; however, the detection method of the existing technology is not sufficient to provide sufficient control accuracy. Utility Model Content

[0009] In view of the above problems, the utility model provides a marine propulsion water-cooled permanent magnet synchronous motor, which aims to improve the weak magnetic performance of the permanent magnet motor from the perspective of physical design; make the back electromotive force as sinusoidal as possible, reduce the influence of the motor back electromotive force harmonics on the drive system, and improve the control accuracy of the entire control system; save energy and reduce long-term operating costs; have a higher power density, so that the utilization rate of the motor's own materials is optimal.

[0010] In order to solve the above problems, the technical solution provided by the utility model is:

[0011] A marine propulsion water-cooled permanent magnet synchronous motor comprises a water cooling circulation system, a permanent magnet energy conversion system, a temperature measurement protection device, and a detection limit device; wherein:

[0012] The water cooling circulation system includes a front cover, a stainless steel joint, a stainless steel bellows, a machine base, and a rear cover;

[0013] The permanent magnet energy conversion system includes a motor permanent magnet rotor, a junction box, and a motor stator;

[0014] The temperature measuring protection device comprises a brush device, a winding temperature measuring instrument, a winding moisture-proof heating belt, and a bearing temperature measuring instrument;

[0015] The detection limit device comprises a connecting plate, a power-off brake, a connecting plate, an encoder and a protective cover.

[0016] Preferably, one of the stainless steel joints is welded directly above the front end cover as a water inlet; and one of the stainless steel joints is welded 35 degrees clockwise of the front end cover as a water outlet;

[0017] A stainless steel joint is welded at 35 degrees clockwise in front of the machine base as a water inlet; a stainless steel joint is welded at 35 degrees counterclockwise in the rear of the machine base as a water outlet;

[0018] A stainless steel joint is welded directly above the rear end cover as a water outlet; and a stainless steel joint is welded 35 degrees clockwise from the rear end cover to the shaft tail as a water inlet.

[0019] Preferably, the front end cover is connected to the machine base through a stopper; the water outlet of the front end cover is connected to the water inlet of the machine base through the stainless steel bellows;

[0020] The rear end cover is connected to the machine base through a stopper; the water inlet of the rear end cover is connected to the water outlet of the machine base through the stainless steel bellows.

[0021] Preferably, magnetic steel is built into the permanent magnet rotor of the motor;

[0022] The magnetic steel is of V-shaped structure and is manufactured by adopting segmented inclined pole process.

[0023] Preferably, a magnetic steel slot for mounting the magnetic steel is provided in the permanent magnet rotor of the motor;

[0024] After the magnetic steel is installed in the magnetic steel slot, epoxy resin is filled into the magnetic steel slot, and the magnetic steel slot is sealed front and back by end plates, and finally the magnetic steel is fixed in the magnetic steel slot by tightening screws.

[0025] Preferably, the brush device is mounted on the outer surface of the front end cover by screws; and the bottom of the brush device is in contact with the permanent magnet rotor.

[0026] Preferably, the winding temperature meter is built into the winding of the motor stator; the lead wire of the winding temperature meter is introduced into the junction box;

[0027] The winding moisture-proof heating belt is built into the winding of the motor stator; and the lead wire of the winding moisture-proof heating belt is introduced into the junction box.

[0028] Preferably, the bearing temperature meter comprises a front bearing temperature meter and a rear bearing temperature meter; wherein:

[0029] The sensing component of the front bearing temperature measuring instrument is placed at 30 degrees counterclockwise to the right of the front end cover; the lead wire of the front bearing temperature measuring instrument is introduced into the junction box;

[0030] The sensor component of the rear bearing temperature meter is placed 30 degrees clockwise to the left of the rear end cover; the lead wire of the rear bearing temperature meter is introduced into the junction box.

[0031] Preferably, the connecting plate is connected to the rear end cover by means of a stopper; the connecting plate is also connected to the protective cover by means of a stopper; the connecting plate is also connected to the power-off brake by means of screws;

[0032] The power-off brake is connected to the coupling disc through a stopper;

[0033] The encoder is fixed to the tail of the permanent magnet rotor through a flat key and is connected to the coupling disk through an elastic connecting sheet.

[0034] Compared with the prior art, the utility model has the following advantages:

[0035] 1. Since the marine propulsion water-cooled permanent magnet synchronous motor of the present invention adopts a permanent magnet built-in V-shaped magnetic circuit structure, the weak magnetic performance of the permanent magnet motor can be improved in terms of physical design;

[0036] 2. Since the marine propulsion water-cooled permanent magnet synchronous motor of the present invention adopts rotor skew poles and segmented magnetic steel to weaken the tooth slot torque, a more ideal air gap magnetic flux waveform is obtained by optimizing the magnetic circuit, so that the back electromotive force is made as sinusoidal as possible, reducing the influence of the motor back electromotive force harmonics on the drive system and improving the control accuracy of the entire control system; further, the permanent magnet motor using the technical solution of the present invention can more accurately test the performance of the motor design solution when performing ANSYS multi-physics field joint simulation, and can also achieve optimization of the control algorithm.

[0037] 3. Since the marine propulsion water-cooled permanent magnet synchronous motor of the present invention adopts a sensor encoder as a detection device for motor position and speed sampling, the control accuracy is greatly improved;

[0038] 4. Since the efficiency and power factor of the marine propulsion water-cooled permanent magnet synchronous motor of the present invention are both higher than 0.95, the quality factor of the power grid is improved, so there is no need to add a power factor compensator, which saves energy and reduces long-term operating costs. The purchase cost of the motor can be recovered by saving electricity in one year;

[0039] 5. Since the marine propulsion water-cooled permanent magnet synchronous motor of the present invention adopts a water cooling circulation system to reduce the temperature rise of the motor, it has a higher power density, optimizes the utilization rate of the motor's own materials, and can be further used to completely replace asynchronous motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1a It is a schematic diagram of the overall structure of the motor structure of a specific embodiment of the utility model;

[0041] Figure 1b It is a three-dimensional schematic diagram of the appearance of a specific embodiment of the utility model;

[0042] Figure 2a A schematic diagram of a half-section structure of a motor structure according to a specific embodiment of the utility model;

[0043] Figure 2b It is a schematic diagram of the full cross-section structure of the motor structure of a specific embodiment of the utility model;

[0044] Figure 3 This is a schematic diagram of pipeline connection of a specific embodiment of the utility model.

[0045] Among them: 1. Water cooling circulation system, 2. Permanent magnet energy conversion system, 3. Temperature measurement and protection device, 4. Detection limit device, 5. Brush device, 6. Front cover, 7. Winding temperature meter, 8. Winding moisture-proof heating belt, 9. Junction box, 10. Machine base, 11. Motor stator, 12. Motor permanent magnet rotor, 13. Rear cover, 14. Connecting plate, 15. Power-off brake, 16. Coupling plate, 17. Encoder, 18. Protective cover, 19. Bearing temperature meter, 20. Stainless steel joint, 21. Stainless steel bellows. DETAILED DESCRIPTION

[0046] The present invention is further illustrated below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0047] like Figure 1a to Figure 1b As shown, a marine propulsion water-cooled permanent magnet synchronous motor comprises a water cooling circulation system 1, a permanent magnet energy conversion system 2, a temperature measurement protection device 3, and a detection limit device 4; wherein:

[0048] like Figure 2a to Figure 2b As shown, the water cooling circulation system 1 includes a front cover 6 , a stainless steel joint 20 , a stainless steel bellows 21 , a machine base 10 , and a rear cover 13 .

[0049] In this specific embodiment, a stainless steel joint 20 is welded directly above the front end cover 6 as a water inlet; and a stainless steel joint 20 is welded 35 degrees clockwise of the front end cover 6 as a water outlet.

[0050] In this specific embodiment, a stainless steel joint 20 is welded at 35 degrees clockwise in front of the machine base 10 as a water inlet; and a stainless steel joint 20 is welded at 35 degrees counterclockwise in the rear of the machine base 10 as a water outlet.

[0051] In this specific embodiment, a stainless steel joint 20 is welded directly above the rear end cover 13 as a water outlet; a stainless steel joint 20 is welded 35 degrees clockwise from the rear end cover 13 to the shaft tail as a water inlet.

[0052] In this specific embodiment, the front end cover 6 is connected to the machine base 10 through a stopper; the water outlet of the front end cover 6 is connected to the water inlet of the machine base 10 through a stainless steel bellows 21.

[0053] In this specific embodiment, the rear end cover 13 is connected to the machine base 10 through a stopper; the water inlet of the rear end cover 13 is connected to the water outlet of the machine base 10 through a stainless steel bellows 21.

[0054] It should be noted that, through the communication between the front end cover 6, the rear end cover 13 and the base 10, an internal cavity water circulation is formed, thereby ensuring the smooth flow of the water path.

[0055] It should be noted that the front cover 6, the rear cover 13 and the base 10 adopt a circulating water structure, the purpose of which is to reduce the temperature rise of the motor while better matching the high power density of the permanent magnet motor, effectively reducing the size of the motor, and being suitable for the limited space of the cabin.

[0056] The permanent magnet energy conversion system 2 includes a motor permanent magnet rotor 12 , a junction box 9 , and a motor stator 11 .

[0057] In this specific embodiment, magnetic steel is built into the permanent magnet rotor 12 of the motor.

[0058] In this specific embodiment, the magnetic steel is of V-shaped structure and is manufactured by using a segmented inclined pole process.

[0059] It should be noted that the purpose of adopting a V-shaped magnetic circuit structure in the rotor is to improve the weak magnetic performance, so that it has the characteristics of low-speed and high-torque output, strong overload capacity and a wide speed regulation range; in addition, it can also reduce weight and noise and improve driving efficiency; the rotor skew poles and magnetic steel segmentation weaken the tooth torque, and a more ideal air gap magnetic density waveform is obtained by optimizing the magnetic circuit, so that the back EMF is as sinusoidal as possible, reducing the impact of the motor back EMF harmonics on the drive system and improving the control accuracy of the entire control system.

[0060] In this specific embodiment, a magnetic steel slot for installing a magnetic steel is provided in the permanent magnet rotor 12 of the motor.

[0061] In this specific embodiment, after the magnet is installed in the magnet slot, epoxy resin is filled into the magnet slot, and the magnet slot is sealed front and back by end plates, and finally the magnet is fixed in the magnet slot by tightening screws.

[0062] like Figure 3 As shown, the temperature measuring protection device 3 includes a brush device 5, a winding temperature measuring device 7, a winding moisture-proof heating belt 8, and a bearing temperature measuring device 19.

[0063] In this specific embodiment, the brush device 5 is mounted on the outer surface of the front end cover 6 by screws; the bottom of the brush device 5 is in contact with the permanent magnet rotor.

[0064] It should be noted that the purpose of the bottom of the brush device 5 being in contact with the permanent magnet rotor is to suppress the shaft current.

[0065] In this specific embodiment, the bearing temperature meter 19 includes a front bearing temperature meter and a rear bearing temperature meter; wherein:

[0066] The sensing component of the front bearing temperature meter is placed 30 degrees counterclockwise horizontally to the right of the front end cover 6; the lead wire of the front bearing temperature meter is introduced into the junction box 9.

[0067] The sensor component of the rear bearing temperature meter is placed at 30 degrees clockwise to the left of the rear end cover 13; the lead wire of the rear bearing temperature meter is introduced into the junction box 9.

[0068] In this specific embodiment, the winding temperature meter 7 is built into the winding of the motor stator 11 ; the lead wires of the winding temperature meter 7 are introduced into the junction box 9 .

[0069] In this specific embodiment, the winding moisture-proof heating belt 8 is built into the winding of the motor stator 11 ; the lead wires of the winding moisture-proof heating belt 8 are introduced into the junction box 9 .

[0070] The detection limit device 4 comprises a connecting plate 14 , a power-off brake 15 , a connecting plate 16 , an encoder 17 , and a protective cover 18 .

[0071] In this specific embodiment, the connecting plate 14 is connected to the rear end cover 13 by means of a stopper; the connecting plate 14 is also connected to the protective cover 18 by means of a stopper; the connecting plate 14 is also connected to the power-off brake 15 by means of screws.

[0072] In this specific embodiment, the power-off brake 15 is connected to the coupling plate 16 by means of a stopper.

[0073] The encoder 17 is fixed to the tail of the permanent magnet rotor through a flat key and is connected to the coupling disc 16 by an elastic connecting sheet.

[0074] It should be noted that the brake limit device is used for rapid braking of the hull; the sensor encoder 17 is used for sampling the motor rotor position and speed, which directly determines the vector control accuracy of the motor; the shaft current suppression device and the bearing and winding temperature measuring devices are provided to effectively protect the normal operation of the motor.

[0075] It should be further explained that the insulation level of the motor winding is excellent, the coil uses high-performance electromagnetic wire, the motor as a whole adopts CCS marine design standards, the overall sealing performance is good, and it can adapt to the harsh environment of ships or offshore facilities, such as high temperature, high humidity, high salinity, etc., to ensure its long-term and stable operation.

[0076] It should be further explained that the motor body of this specific embodiment is a brushless structure with excellent load characteristics, and the output torque at low frequency is larger than that of an asynchronous motor, and soft starting and soft stopping can be achieved.

[0077] After testing under actual working conditions, the efficiency and power factor of the motor in this specific embodiment are both higher than 0.95, which improves the quality factor of the power grid and does not require a power factor compensator, saving energy and reducing long-term operating costs. The efficiency and power factor of the motor in other frequency conversion ranges are also much higher than those of traditional motors, and have a higher power density, which optimizes the utilization rate of the motor's own materials.

[0078] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than those clearly stated in each claim. On the contrary, as reflected in the attached claims, the utility model is in a state with less than all the features of the disclosed individual embodiments. Therefore, the attached claims are hereby expressly incorporated into the detailed description, with each claim acting alone as a separate preferred embodiment of the utility model.

[0079] The disclosed embodiments are described above to enable any person skilled in the art to implement or use the present invention. Various modifications of these embodiments are obvious to those skilled in the art, and the general principles defined herein may also be applied to other embodiments without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure is not limited to the embodiments given herein, but is consistent with the broadest scope of the principles and novel features disclosed in the present application.

[0080] The above description includes examples of one or more embodiments. Of course, it is not possible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", just as "including," is explained as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

[0081] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A water-cooled permanent magnet synchronous motor for marine propulsion, characterized in that: It comprises a water cooling circulation system (1), a permanent magnet energy conversion system (2), a temperature measurement protection device (3), and a detection limit device (4); wherein: The water cooling circulation system (1) comprises a front end cover (6), a stainless steel joint (20), a stainless steel bellows (21), a machine base (10), and a rear end cover (13); The permanent magnet energy conversion system (2) comprises a motor permanent magnet rotor (12), a junction box (9), and a motor stator (11); The temperature measuring protection device (3) comprises a brush device (5), a winding temperature measuring instrument (7), a winding moisture-proof heating belt (8), and a bearing temperature measuring instrument (19); The detection limit device (4) comprises a connecting plate (14), a power-off brake (15), a connecting plate (16), an encoder (17), and a protective cover (18).

2. The marine propulsion water-cooled permanent magnet synchronous motor according to claim 1, characterized in that: A stainless steel joint (20) is welded directly above the front end cover (6) as a water inlet; a stainless steel joint (20) is welded 35 degrees clockwise of the front end cover (6) as a water outlet; A stainless steel joint (20) is welded at a position 35 degrees clockwise in front of the machine base (10) as a water inlet; a stainless steel joint (20) is welded at a position 35 degrees counterclockwise in the rear of the machine base (10) as a water outlet; A stainless steel joint (20) is welded directly above the rear end cover (13) as a water outlet; and a stainless steel joint (20) is welded 35 degrees clockwise from the rear end cover (13) facing the shaft tail as a water inlet.

3. The marine propulsion water-cooled permanent magnet synchronous motor according to claim 2, characterized in that: The front end cover (6) is connected to the machine base (10) by means of a stopper; the water outlet of the front end cover (6) is connected to the water inlet of the machine base (10) by means of the stainless steel bellows (21); The rear end cover (13) is connected to the machine base (10) through a stopper; the water inlet of the rear end cover (13) is connected to the water outlet of the machine base (10) through the stainless steel bellows (21).

4. The marine propulsion water-cooled permanent magnet synchronous motor according to claim 3 is characterized in that: The motor permanent magnet rotor (12) has magnetic steel built in; The magnetic steel is of V-shaped structure and is manufactured by adopting segmented inclined pole process.

5. The marine propulsion water-cooled permanent magnet synchronous motor according to claim 4, characterized in that: The motor permanent magnet rotor (12) is provided with a magnetic steel slot for mounting the magnetic steel; After the magnetic steel is installed in the magnetic steel slot, epoxy resin is filled into the magnetic steel slot, and the magnetic steel slot is sealed front and back by end plates, and finally the magnetic steel is fixed in the magnetic steel slot by tightening screws.

6. The marine propulsion water-cooled permanent magnet synchronous motor according to claim 5, characterized in that: The brush device (5) is mounted on the outer surface of the front end cover (6) by means of screws; the bottom of the brush device (5) is in contact with the permanent magnet rotor (12).

7. The marine propulsion water-cooled permanent magnet synchronous motor according to claim 6, characterized in that: The winding temperature measuring instrument (7) is built into the winding of the motor stator (11); the lead wire of the winding temperature measuring instrument (7) is introduced into the junction box (9); The winding moisture-proof heating belt (8) is built into the winding of the motor stator (11); and the lead wire of the winding moisture-proof heating belt (8) is introduced into the junction box (9).

8. The marine propulsion water-cooled permanent magnet synchronous motor according to claim 7, characterized in that: The bearing temperature measuring instrument (19) comprises a front bearing temperature measuring instrument and a rear bearing temperature measuring instrument; wherein: The sensing component of the front bearing temperature measuring instrument is placed at a position 30 degrees counterclockwise to the right of the front end cover (6); the lead wire of the front bearing temperature measuring instrument is introduced into the junction box (9); The sensor component of the rear bearing temperature measuring instrument is placed at a position 30 degrees clockwise to the left of the rear end cover (13); the lead wire of the rear bearing temperature measuring instrument is introduced into the junction box (9).

9. The marine propulsion water-cooled permanent magnet synchronous motor according to claim 8, characterized in that: The connecting plate (14) is connected to the rear end cover (13) by means of a stopper; the connecting plate (14) is also connected to the protective cover (18) by means of a stopper; the connecting plate (14) is also connected to the power-off brake (15) by means of screws; The power-off brake (15) is connected to the coupling disc (16) through a stopper; The encoder (17) is fixed to the tail of the permanent magnet rotor (12) via a flat key, and is connected to the coupling disk (16) via an elastic connecting sheet.

Images