Half-type permanent magnet shaft generator for high-power-density ship

Abstract

The invention relates to a high-power-density marine split-type permanent magnet shaft generator, which comprises a split-type stator, a split-type rotor and a cooling chamber, and is characterized in that a circulating water channel is arranged on the outer wall of a base of the split-type stator and is connected through a cooling water pipe; an air inlet and an air outlet are formed in two ends of the base; the cooling chamber is integrated at the top of the generator; the split-half rotor comprises a permanent magnet, a rotor core, a rotor support and an expansion sleeve. The rotor core is provided with a plurality of ventilation holes in the axial direction. The generator adopts a stator surface water cooling and forced air cooling mixed cooling system, and a water cooling channel and an air cooling channel operate independently and dissipate heat cooperatively. Through the structural design of the generator, the stator and the rotor of the generator are fully cooled, the heat dissipation efficiency of the generator is improved, and the power density of the generator is improved. A generator rotor permanent magnet is of a tangential structure, and the power density of the generator is further improved. And the ventilation holes are axially added to the rotor iron core, so that the weight of the rotor is reduced, and the influence on the original shafting of the ship is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and more specifically, relates to a high power density marine split permanent magnet shaft generator structure. Background Art

[0002] Installing a shaft generator on existing ships can help the ships save fuel and reduce carbon emissions. In order not to affect the shipping requirements of the ships, a split shaft generator with a short installation period is usually adopted. Most of the existing split shaft generators adopt a water jacket cooling structure, which directly cools only the stator core part, with a low power density, a heavy rotor weight, and a great impact on the original ship shafting.

[0003] Most of the existing split shaft generators adopt water cooling of the machine base, but the rotor has difficulty in dissipating heat, resulting in too high a temperature of the permanent magnet, and there is a risk of demagnetization. For example, the compact permanent magnet generator of patent CN114498993B adopts a double helix water jacket and an air-water cooler, and the cooling is concentrated on the stator. The rotor relies on air cooling, but it does not adopt a split structure and is not combined with the design of axial ventilation holes. CN117134568A proposes a split permanent magnet shaft-mounted generator, which uses a shrink fit to connect the rotor and the main shaft, but only relies on air cooling or simple water cooling, without a hybrid cooling system, and the cooling effect of the permanent magnet is limited. CN102377286A discloses the combination of air cooling channels and liquid cooling channels in the stator and rotor of the main motor, but does not involve a split structure or a tangential layout of the permanent magnets. The cooling path is limited to the liquid cooling and air cooling circulation of the stator yoke, and no cooling chamber is integrated. CN118157350A proposes the coordinated cooling of the water path and the air path, and segmented ventilation of the stator and rotor, but the structure is integral, and it is impossible to disassemble and assemble the ship's main shaft without disassembly, and the layout of the permanent magnets is not optimized. Therefore, it is necessary to significantly improve the power density and heat dissipation efficiency through the split stator and rotor design, the integration of axial ventilation holes and cooling chambers. Summary of the Invention

[0004] The purpose of the present invention is to propose a high power density marine split permanent magnet shaft generator. Compared with an electric excitation generator, a permanent magnet generator has higher efficiency and is more suitable for the requirements of reducing carbon emissions. By adding an integrated cooling chamber at the upper part of the generator and adding axial ventilation holes to the rotor core, axial ventilation is added to the end of the generator winding, the inner surface of the stator, and the rotor. The circulating water channel outside the stator frame can cool the stator core part. By superimposing the two cooling methods, the heat generated by the generator can be effectively removed, the power density of the generator can be greatly improved, and the volume and weight of the motor can be reduced; the permanent magnet of the generator rotor is of a tangential structure, which can improve the power density of the generator; the axial ventilation holes are added to the rotor core, which reduces the rotor weight and also reduces the impact on the original ship shafting.

[0005] To achieve the above object, the technical solution of the present invention is: a high-power density marine split-type permanent magnet shaft generator, comprising: a split stator, a split rotor, a cooling chamber, split end covers, and split cover plates.

[0006] The split stator includes a frame in two parts, an upper and a lower part, a stator core, and a stator winding. A circulating water channel is provided on the outer wall of the frame and is connected through cooling water pipes; air inlets and outlets are provided at both ends of the upper part of the frame.

[0007] The cooling chamber is integrated at the top of the generator and includes a cooling core, a cooling fan, a winding outlet box, and a measuring terminal box.

[0008] The split rotor includes permanent magnets, a rotor core, a rotor bracket, and a shrink disc. The rotor core is provided with a plurality of ventilation holes along the axial direction.

[0009] The generator adopts a hybrid cooling system of surface water cooling of the stator and forced air cooling of the cooling chamber. The water cooling channel and the air cooling channel operate independently and cooperate to dissipate heat.

[0010] Further, the frame of the split stator is split into an upper frame and a lower frame along the horizontal plane, and the two are connected by bolts. The circulating water channel is distributed on the outer wall of the frame, and cooling water flows into the circulating water channel through the inlet flange and flows out through the outlet flange.

[0011] Further, the stator core is closely attached to the inner wall of the frame, and the circulating water channel cools the stator core after passing through water; the split stator is connected together by bolts.

[0012] Further, the split rotor is fixed to the ship's main shaft through a shrink disc, and the permanent magnets are embedded in the grooves of the rotor core.

[0013] Further, the rotor core is fixed to the surface of the rotor bracket by bolts, and a number of axial ventilation holes are evenly arranged in the circumferential direction of the rotor core.

[0014] Further, the air cooling path of the cooling chamber is: the cooling fan drives the air flow to flow through the end of the stator winding, the air gap between the stator and the rotor, and the axial ventilation holes of the rotor in sequence. After the hot air flow enters the cooling chamber, it is cooled by the water-cooled core and then circulates.

[0015] Further, the split end covers and split cover plates are used to enclose the motor, so that the protection class of the motor reaches IP44.

[0016] Further, the generator selects to lead out wires from the left side, right side, or upper side of the cooling chamber according to the on-site conditions of the ship.

[0017] Further, when the motor is operating normally, one path of cooling water flows in from the cooling core body water inlet in the cooling chamber, and after fully exchanging heat with the hot air flowing into the cooling chamber through the cooling core body, it flows out from the cooling core body water outlet; the cooling fan forms a high-pressure flow field in the cavity on the air inlet side of the machine base. Driven by the fluid pressure, the cooling air flow enters the motor from the air inlet of the machine base, flows through the end of the motor winding on the air inlet side, flows through the air gap between the stator and the rotor and the axial ventilation duct of the rotor to the air outlet of the machine base, and enters the cooling chamber after cooling the end of the winding on the air outlet side, realizing full cooling of the inner surface of the stator, the end of the winding, and the rotor area; one path of cooling water enters at the water inlet flange of the machine base, flows through the circulating water channel outside the machine base, fully exchanges heat with the heat transferred to the inner wall of the machine base, and then flows out from the water outlet flange of the machine base, thereby cooling the stator core and the straight part of the stator winding.

[0018] The beneficial effects of the present invention are as follows:

[0019] Through the design of the generator structure, both the stator and the rotor of the generator are fully cooled, improving the power density of the generator. The permanent magnet of the generator rotor is of a tangential structure, further improving the power density of the generator. Ventilation holes are added axially to the rotor core, reducing the rotor weight and also reducing the impact on the original shafting of the ship. Description of the Drawings

[0020] Figure 1 is the overall structural schematic diagram of the generator of the present invention;

[0021] Figure 2 is the front view of the generator of the present invention;

[0022] Figure 3 is the axial sectional view of the generator of the present invention;

[0023] Figure 4 is the rotor diagram of the generator of the present invention;

[0024] Figure 5 is the internal cooling air duct diagram of the generator of the present invention. Detailed Embodiments

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention.

[0026] Refer to Figures 1 to 5 , a high-power density marine split permanent magnet shaft generator in this embodiment mainly consists of a split stator 4, a split rotor 18, a cooling chamber 5, a split end cover 1, and a split cover plate 3.

[0027] The split stator 4 includes a split frame 16, a split stator core 20, and a stator winding 17. A circulating water channel 19 is provided outside the split frame 16. The upper and lower split frame circulating water channels are connected by a cooling water pipe 6. The split stator core 20 is closely attached to the inner wall of the frame. After the circulating water channel passes through water, it can cool the stator core part of the motor. Air inlets and outlets are provided at both ends of the upper part of the frame. The split stator is connected together by bolts.

[0028] The cooling chamber 5 integrates a cooling core 11, a cooling fan 15, the main outgoing line 9 of the generator, and a measuring outgoing line box 8. The cooling chamber integrates a measuring junction box, a main junction box, and a cooler into one body. Compared with the independent installation of three independent components on the generator, the volume and weight are reduced. The cooling core 11 intakes water through the water inlet 12 at the lower part and discharges water through the water outlet 10 at the upper part.

[0029] The split rotor 18 includes a permanent magnet 26, a split rotor core 21, a split rotor bracket 22, a split connection flange 23, and a split expansion sleeve 24. Among them, the permanent magnet 26 is embedded in the split rotor core 21. The split rotor bracket 22 and the split connection flange 23 are bolted together. The split rotor 18 and the ship's main shaft 2 are tightened and fixed by an expansion sleeve 24.

[0030] The split rotor core 21 is fixed on the surface of the split rotor bracket 22 by bolts, and axial ventilation holes 25 are provided in the rotor core.

[0031] The split end covers 1 and the split cover plates 3 are used to enclose the motor and increase the protection level of the motor.

[0032] The generator can be connected to an external cable through the outlet 9 on both sides of the cooling chamber or the upper outlet 7 according to the ship's on-site conditions.

[0033] The working principle of this embodiment in actual application is as follows:

[0034] A stream of cooling water flows in from the water inlet 12 of the cooling core 11 in the cooling chamber 5, and after sufficient heat exchange with the hot air flowing into the cooling chamber through the cooling core, it flows out from the water outlet 10 of the cooling core. The cooling fan 15 forms a high-pressure flow field in the cavity on the air inlet side of the frame. Driven by the fluid pressure, the cooling air flow enters the motor from the air inlet of the frame. The cooling air flow flows through the end of the motor winding 17 on the air inlet side, flows through the air gap between the stator core 20 and the rotor core 21 and the rotor axial ventilation duct 25 to the air outlet of the frame, and enters the cooling chamber 5 after cooling the end of the winding on the air outlet side, achieving full cooling of the inner surface of the stator, the end of the winding, and the rotor area. The cooling air path is as shown in the appendix Figure 5As shown in the figure, a stream of cooling water enters through the water inlet flange 14 of the machine base 16, flows through the circulating water channel 19 outside the machine base, and after fully exchanging heat with the heat transferred to the inner wall of the machine base, it flows out from the water outlet flange 13 of the machine base, thereby cooling the stator core and the straight part of the stator winding.

[0035] The high-power density marine split permanent magnet shaft generator of the present invention has the following characteristics:

[0036] 1. Split structure: The stator and rotor are split along the horizontal plane, which is convenient for installation and does not require the disassembly of the ship's drive shaft;

[0037] 2. Hybrid cooling system: The circulating water channel on the outer wall of the machine base cools the stator, and the air-cooling system in the cooling chamber cools the winding ends, rotor and permanent magnets through the axial ventilation holes;

[0038] 3. Optimized air flow path: The forced air-cooled air flow sequentially passes through the winding ends, air gap, and rotor ventilation holes, and the hot air circulates after exchanging heat with the water-cooled core in the cooling chamber;

[0039] 4. Rotor design: The design of the axial ventilation holes in the rotor core reduces the axial wind resistance and the temperature of the permanent magnets.

[0040] 5. Technical verification of its technical effects:

[0041] (1) The power density is increased by 30% compared with the traditional model;

[0042] (2) The temperature rise of the permanent magnet ≤ 40K, and the risk of demagnetization is reduced. Since the temperature of the permanent magnet is low, a permanent magnet variety with a low temperature coefficient can be used to reduce the cost;

[0043] (3) The rotor is light in weight and has little impact on the original shafting of the ship.

Claims

1. A high power density marine split-half permanent magnet shaft generator, characterized in that: include: Half stator, half rotor, cooling chamber, half end cover, half cover plate, The split stator includes a base of upper and lower parts, a stator core and a stator winding. The outer wall of the base is provided with a circulating water channel and connected by a cooling water pipe; an air inlet and an air outlet are provided at both ends of the upper part of the base; The cooling chamber is integrated on the top of the generator and includes a cooling core, a cooling fan, a winding outlet box and a measurement terminal box; The half-type rotor comprises a permanent magnet, a rotor core, a rotor support and a tightening sleeve, wherein the rotor core is provided with a plurality of ventilation holes along the axial direction; The generator adopts a mixed cooling system of stator surface water cooling and forced air cooling, and the water cooling channel and the air cooling channel operate independently and cooperate to dissipate heat.

2. The high power density marine split-half permanent magnet shaft generator according to claim 1 is characterized in that: The base of the split stator is divided into an upper base and a lower base along a horizontal plane, the two are connected by bolts, and the circulating water channel is distributed on the outer wall of the base. The cooling water flows into the circulating water channel through the water inlet flange and then flows out from the water outlet flange.

3. The high power density marine split-half permanent magnet shaft generator according to claim 1, characterized in that: The stator core is closely attached to the inner wall of the base, and the circulating water channel cools the stator core after water passes through it; the half-type stators are connected together by bolts.

4. The high power density marine split-half permanent magnet shaft generator according to claim 1, characterized in that: The half-rotor is fixed to the ship main shaft through a tightening sleeve, and the permanent magnet is embedded in the rotor core groove.

5. The high power density marine split-half permanent magnet shaft generator according to claim 1, characterized in that: The rotor core is fixed to the surface of the rotor bracket by bolts, and a plurality of axial ventilation holes are evenly arranged in the circumferential direction of the rotor core.

6. The high power density marine split-half permanent magnet shaft generator according to claim 1, characterized in that: The air cooling path of the cooling chamber is: the cooling fan drives the air flow to flow through the stator winding end, the stator-rotor air gap, and the rotor axial ventilation hole in sequence, and the hot air flow enters the cooling chamber and is cooled by the water-cooled core before circulating.

7. The high power density marine split-half permanent magnet shaft generator according to claim 1, characterized in that: The half-type end cover and the half-type cover plate are used to seal the motor so that the protection level of the motor reaches IP44.

8. The high power density marine split-half permanent magnet shaft generator according to claim 1, characterized in that: The generator is selected to output wires from the left side, right side or upper side of the cooling chamber according to the on-site conditions of the ship.

9. The high power density marine split-half permanent magnet shaft generator according to claim 1, characterized in that: When the motor is working normally, one path of cooling water flows in from the water inlet of the cooling core in the cooling chamber, passes through the cooling core and fully exchanges heat with the hot air flowing into the cooling chamber, and then flows out from the water outlet of the cooling core; the cooling fan forms a high-pressure flow field in the machine cavity on the air inlet side of the machine base. Driven by the fluid pressure, the cooling airflow enters the motor from the air inlet of the machine base, flows through the end of the motor winding on the air inlet side, flows to the air outlet of the machine base through the air gap between the stator and the rotor and the axial ventilation duct of the rotor, cools the end of the winding on the air outlet side, and then enters the cooling chamber, thereby achieving sufficient cooling of the inner surface of the stator, the end of the winding and the rotor area; one path of cooling water enters at the water inlet flange of the machine base, flows through the circulating water channel outside the machine base, fully exchanges heat with the heat transferred to the inner wall of the machine base, and then flows out from the water outlet flange of the machine base, thereby cooling the stator core and the straight part of the stator winding.

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