Heat dissipation system for partial heat accumulation of double-winding permanent magnet generator and working method

Abstract

This invention belongs to the field of power generation technology, specifically relating to a cooling technology for power generation equipment, and more particularly to a heat dissipation system and working method for local heat accumulation in a dual-winding permanent magnet generator. The heat dissipation system for local heat accumulation in a dual-winding permanent magnet generator uses an on-board controller to determine the heat dissipation gap of the dual-winding permanent magnet generator based on the proportion of power change in the power system when both windings are generating power simultaneously. Then, based on the heat dissipation gap, the cooling power of the fan and water pump is controlled to improve heat dissipation, thereby increasing the cooling power of the fan and water pump, improving the heat dissipation effect, preventing local heat accumulation from causing the temperature to rise beyond the temperature limit, and ensuring the performance of the dual-winding permanent magnet generator.

Description

Technical Field

[0001] This invention belongs to the field of power generation technology, specifically relating to a cooling technology for power generation equipment, and more particularly to a heat dissipation system and working method for local heat accumulation in a dual-winding permanent magnet generator. Background Technology

[0002] Vehicle 800 V At higher voltage platforms, rapid acceleration when the vehicle is low on power can cause heat buildup in the dual-winding permanent magnet generator.

[0003] With peak power 80 kW Taking the vehicle's onboard generator as an example, when the vehicle accelerates rapidly in a depleted state, the generator power needs to increase from 30 km / h within 2 seconds. kW Step jump to 80 kW Only in this way can the dual requirements of high-power output of the drive motor and power battery charging be met simultaneously.

[0004] For automotive generators with the same stator slot volume and peak output capability, the single-winding scheme only requires slot insulation and a single set of inter-turn insulation within the stator slot, resulting in a low proportion of space occupied by the slot insulation. Furthermore, when the winding operating current instantaneously jumps from a steady-state value of tens of amperes to a peak value of over one hundred amperes... The dual-winding scheme requires two independent windings to be staggered in the same slot. In addition to basic insulation, extra interlayer insulation between the two windings and inter-turn insulation between each winding are needed, increasing the slot space occupied by insulation by 30% to 50%. This reduces the slot space available for copper wire, requiring a 30% to 50% decrease in the total cross-sectional area of ​​the copper wire in the windings. This directly leads to a 3 to 6-fold increase in resistance, and the resulting increase in resistance results in greater heat generation than in the single-winding scenario.

[0005] In a single winding with the same slot, the upper and lower conductors belong to the same set of windings, and only one side is heated. The heat is conducted outward in one direction, the heat conduction path is smooth, and there is no internal heat superposition effect. The upper and lower conductors of the dual-winding in the same slot belong to two independent heating elements. They heat up synchronously during power jumps and "bake" the middle insulation layer in both directions. The dual windings are distributed in different positions of the motor, and the heat dissipation effect is different in different positions. In the poorly heated position, the temperature rise in the middle area is the heat accumulation of the two windings. This local heat accumulation directly leads to the formation of a high heat field in the slot. Within 1 second, the local temperature of the middle insulation layer in the slot can soar from the rated operating temperature of 120°C to over 180°C, breaking the upper limit of the temperature resistance.

[0006] Meanwhile, neodymium iron boron permanent magnets have a clear upper limit to their temperature resistance. UH Level 180℃ EHWhen the temperature of the permanent magnet exceeds the Curie temperature (200℃), the continuous heat accumulation on the stator side will be transferred to the rotor, which has extremely poor heat dissipation conditions, through the air gap. When the temperature of the permanent magnet exceeds the Curie temperature, irreversible demagnetization will occur, causing the generator output power to plummet, efficiency to decrease permanently, or even completely lose its power generation capacity.

[0007] In scenarios such as continuous high-power generation during high-speed cruising with low power or continuous full-load operation during high-altitude climbing with low power, the thermal equilibrium temperature caused by "local heat accumulation" will be far higher than that of a single-winding scheme. Traditional heat dissipation control is closed-loop control, which can respond to traditional motors. This application targets a dual-winding permanent magnet generator. The use of closed-loop control has a delay and cannot meet the rapid heat dissipation requirements required for the rapid and direct formation of a high-temperature field in the slot due to local heat accumulation.

[0008] Therefore, in dual-winding permanent magnet generators, the technical problem of local heat accumulation causing temperature rise exceeding the temperature limit, leading to a sharp drop in generator output power and a permanent decrease in efficiency, necessitates the design of a heat dissipation system and operating method for local heat accumulation in dual-winding permanent magnet generators.

[0009] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Summary of the Invention

[0010] This disclosure provides at least one heat dissipation system and its working method for local heat accumulation in a dual-winding permanent magnet generator.

[0011] In a first aspect, embodiments of this disclosure provide a heat dissipation system for localized heat accumulation in a dual-winding permanent magnet generator, comprising: The vehicle-mounted controller, and a dual-winding permanent magnet generator, a fan, and a water pump electrically connected to the vehicle-mounted controller; The fan and water pump are configured to cool the dual-winding permanent magnet generator. The dual-winding permanent magnet generator has two sets of stacked windings in each stator core slot. The windings of the same layer in each stator core slot constitute a generating winding. The two generating windings are respectively connected to two independent three-phase rectifier bridges. The output terminals of the two three-phase rectifier bridges are connected in series, and the two generating windings generate electricity at the same time. The on-board controller is configured to, when both generating windings generate electricity simultaneously, obtain the heat dissipation gap of the dual-winding permanent magnet generator according to the proportion of power change in the power system, and then control the cooling power of the fan and water pump to dissipate heat according to the heat dissipation gap of the dual-winding permanent magnet generator.

[0012] In one alternative implementation, the on-board controller is configured to acquire the heat dissipation gap of the dual-winding permanent magnet generator: P 0= K 1* K 4* (3*) I 2 * R ), K 4 > 1; P 0= K 1* (3*) I 2 * R ), K 4≤1; in, P 0 represents the heat dissipation gap in the dual-winding permanent magnet generator. K 1 is the thermal expansion coefficient. K 4 represents the power change proportionality coefficient. I This represents the increment of the current under the current command. R This is the total resistance of the generator windings.

[0013] In one alternative implementation, the vehicle controller is configured to acquire a power change ratio coefficient and determine whether the power change ratio coefficient is substituted into the formula used to acquire the heat dissipation gap of the dual-winding permanent magnet generator. K 4 = ( T 1 / T 0) * 100%; in, K 4 represents the power variation proportionality coefficient; T 1 represents the completion time of the power system's power requirement under the current command; T 0 represents standard time; when K When 4 is greater than 1, K 4. Substitute into the formula used to obtain the heat dissipation gap of the dual-winding permanent magnet generator; otherwise, K 4. Remove.

[0014] In one alternative implementation, the on-board controller is configured to acquire the proportion of power system power changes: K 0 = ( P 1 / P 2) *100%; in, K 0 represents the proportion of power change in the power system; P 1 represents the increment of the power system's output under the current command; P 2 represents the rated power of the power system; P 1 = P 3- P 4; in,P 3 represents the power requirement of the power system under the current command; P 4 represents the power of the power system at the previous moment; The power system refers to the vehicle's power system.

[0015] In one alternative implementation, the vehicle controller is configured to... P When 1 is greater than 0, the proportion of the power change in the power system is obtained. P When 1 is less than or equal to 0, the vehicle controller reduces its heat dissipation power after a preset time.

[0016] In one alternative implementation, when K 0 when the power change ratio is within the first preset range or the second preset range. K 1 is the first preset value; when K When the power change ratio is within the third preset range, K 1 is the second preset value; when K When the power change ratio is within the fourth preset range, K 1 is the third preset value; The first preset power change ratio range, the second preset power change ratio range, the third preset power change ratio range, and the fourth preset power change ratio range are sequentially consecutive ranges. The first preset value is less than the second preset value and less than the third preset value.

[0017] In one alternative implementation, the on-board controller is configured to control the cooling power of the fan and water pump for heat dissipation based on the heat dissipation gap of the dual-winding permanent magnet generator. The cooling power of the water pump and the cooling power of the fan are: P 水泵 = K 5* P 0; P 风扇 = K 6* P 0; in, P 水泵 This refers to the heat dissipation power of the water pump; P 风扇 This refers to the cooling power of the fan; K 5 represents the heat dissipation ratio required by the water pump; K 6 represents the required cooling ratio for the fan; K 2 = ( P 水泵 * n1) / P 5; in, P 5 represents the full-load heat dissipation power of the water pump, that is, the heat dissipation power of the water pump at full speed. K 2 represents the water pump speed; n 1 represents the maximum speed of the water pump; K 3 = ( P 风扇 * n 2) / P 6; in, P 6 represents the fan's full-load cooling power, i.e., the cooling power of the fan at full speed. K 3 represents the fan speed; n 2 represents the maximum fan speed; The vehicle controller is configured to control the water pump and fan based on the water pump speed and fan speed for heat dissipation.

[0018] In one alternative implementation, P 5 and P All 6 are calibrated based on the maximum heat load of the entire vehicle, with the maximum heat load of the entire vehicle as a preset ratio. P 2.

[0019] In one alternative implementation, when K 0 When the first preset power change ratio range is reached, at this time K 5 represents the first preset water pump cooling ratio. K 6 represents the first preset fan cooling ratio, the first preset water pump cooling ratio is greater than the first preset fan cooling ratio, and the sum of the first preset fan cooling ratio and the first preset water pump cooling ratio is 100%. when K When the second preset power change ratio is within 0, at this time K 5 represents the second preset water pump cooling ratio. K 6 represents the second preset fan cooling ratio, the second preset water pump cooling ratio is greater than the second preset fan cooling ratio, and the sum of the second preset fan cooling ratio and the second preset water pump cooling ratio is 100%, and the first preset water pump cooling ratio is greater than the second preset water pump cooling ratio. when K When the power change ratio is within the third preset range, at this time... K 5 represents the third preset water pump cooling ratio. K 6 represents the third preset fan cooling ratio, the third preset water pump cooling ratio is equal to the third preset fan cooling ratio, and the sum of the third preset fan cooling ratio and the third preset water pump cooling ratio is 100%. when K When the power change ratio is within the fourth preset range, at this time...K 5 represents the fourth preset water pump cooling ratio. K 6 represents the fourth preset fan cooling ratio. The fourth preset water pump cooling ratio is greater than the fourth preset fan cooling ratio, and the sum of the fourth preset fan cooling ratio and the fourth preset water pump cooling ratio is greater than 100%.

[0020] Secondly, this disclosure also provides a method for operating the above-described heat dissipation system for local heat accumulation in a dual-winding permanent magnet generator, comprising: When both generator windings generate electricity simultaneously, the on-board controller obtains the heat dissipation gap of the dual-winding permanent magnet generator based on the proportion of power change in the power system. Then, it controls the cooling power of the fan and water pump to dissipate heat based on the heat dissipation gap of the dual-winding permanent magnet generator.

[0021] The beneficial effect of this invention is that the heat dissipation system for local heat accumulation in a dual-winding permanent magnet generator uses an on-board controller to obtain the heat dissipation gap of the dual-winding permanent magnet generator according to the ratio of power change of the power system when the two generating windings generate electricity at the same time. Then, it controls the heat dissipation power of the fan and water pump according to the heat dissipation gap of the dual-winding permanent magnet generator to dissipate heat, thereby improving the heat dissipation power of the fan and water pump, improving the heat dissipation effect, avoiding local heat accumulation that causes the temperature to rise and exceed the temperature resistance limit, and ensuring the performance of the dual-winding permanent magnet generator.

[0022] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 A schematic block diagram of a heat dissipation system for local heat accumulation in a dual-winding permanent magnet generator provided in an embodiment of this disclosure; Figure 2 A flowchart illustrating a heat dissipation system for localized heat accumulation in a dual-winding permanent magnet generator, provided as an embodiment of this disclosure; Figure 3 This is a schematic diagram of the internal structure of a dual-winding permanent magnet generator provided in an embodiment of this disclosure.

[0026] In the picture: Generator winding 1. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0029] In dual-winding motors with the upper and lower conductors in the same slot, two independent heating elements heat up simultaneously during power surges, bidirectionally "baking" the intermediate insulation layer. The dual windings are distributed in different locations within the motor, resulting in varying heat dissipation effects. In areas with poor heat dissipation, the temperature rise in the middle region is due to the heat accumulation of both windings. This localized heat accumulation directly leads to a high-temperature field within the slot. Within one second, the local temperature of the intermediate insulation layer within the slot can surge from the rated operating temperature of 120°C to over 180°C, exceeding the temperature resistance limit. Meanwhile, neodymium iron boron permanent magnets have a clearly defined temperature resistance limit (…). UH Level 180℃ EH (At temperatures exceeding 200℃), continuous heat accumulation on the stator side is transferred to the rotor, which has extremely poor heat dissipation, through the air gap. When the temperature of the permanent magnet exceeds the Curie temperature, irreversible demagnetization occurs, leading to a sharp drop in generator output power, a permanent decrease in efficiency, or even a complete loss of generator power generation capability. In scenarios such as continuous high-power generation during high-speed cruising with insufficient power, or continuous full-load operation during high-altitude climbing with insufficient power, the thermal equilibrium temperature caused by this "local heat accumulation" will be far higher than that of the single-winding scheme.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0032] like Figure 1 , Figure 2 and Figure 3 As shown, at least one disclosed embodiment provides a heat dissipation system for localized heat accumulation in a dual-winding permanent magnet generator, comprising: an on-board controller, and a dual-winding permanent magnet generator, a fan, and a water pump electrically connected to the on-board controller; the fan and water pump are configured to dissipate heat from the dual-winding permanent magnet generator; each stator core slot of the dual-winding permanent magnet generator has two sets of stacked windings, and the windings of the same layer in each stator core slot constitute a generating winding 1, the two generating windings 1 are respectively connected to two independent three-phase rectifier bridges, the output terminals of the two three-phase rectifier bridges are connected in series, and the two generating windings 1 generate electricity simultaneously; the on-board controller is configured to, when the two generating windings 1 generate electricity simultaneously, obtain the heat dissipation gap of the dual-winding permanent magnet generator according to the proportion of power change in the power system, and then control the heat dissipation power of the fan and water pump according to the heat dissipation gap of the dual-winding permanent magnet generator to dissipate heat, thereby increasing the heat dissipation power of the fan and water pump to improve the heat dissipation effect, avoid localized heat accumulation leading to temperature rise exceeding the temperature resistance limit, and ensure the performance of the dual-winding permanent magnet generator.

[0033] In this embodiment, the fan and water pump are both fans and water pumps used in the vehicle's cooling system.

[0034] In one alternative implementation, the vehicle controller is configured to acquire a power change ratio coefficient and determine whether the power change ratio coefficient is substituted into the formula used to acquire the heat dissipation gap of the dual-winding permanent magnet generator. K 4 = ( T 1 / T 0) * 100%; in, K 4 represents the power variation proportionality coefficient; T 1 represents the completion time of the power system's power requirement under the current command; T 0 represents standard time; when K When 4 is greater than 1, K 4. Substitute into the formula used to obtain the heat dissipation gap of the dual-winding permanent magnet generator; otherwise, K 4. Remove.

[0035] In this embodiment, when the completion time of the power demand of the power system under the current command is longer than the standard time, local heat accumulation is likely to occur. Therefore, it is necessary to increase the heat dissipation gap by adding a power change ratio coefficient to the formula used to obtain the heat dissipation gap of the dual-winding permanent magnet generator. By increasing the heat dissipation gap, the heat dissipation power of the fan and water pump can be increased, thereby improving the heat dissipation effect and avoiding a sharp rise in temperature caused by local heat accumulation. Furthermore, by directly increasing the heat dissipation gap to increase the heat dissipation power of the fan and water pump, the traditional closed-loop control is changed to open-loop control, which improves the response speed and achieves rapid heat dissipation.

[0036] In this embodiment, the standard time is the standard time required for the power demand to be met when the dual-winding permanent magnet generator leaves the factory.

[0037] In one alternative implementation, the on-board controller is configured to acquire the proportion of power system power changes: K 0 = ( P 1 / P 2) *100%; in, K 0 represents the proportion of power change in the power system; P 1 represents the increment of the power system's output under the current command; P 2 represents the rated power of the power system; P 1 = P 3- P 4; in, P 3 represents the power requirement of the power system under the current command; P 4 represents the power of the power system at the previous moment; the power system refers to the vehicle's power system.

[0038] In this embodiment, all power values ​​are expressed in units of 1. kW .

[0039] In one alternative implementation, the vehicle controller is configured to... P When 1 is greater than 0, the proportion of the power change in the power system is obtained. P When 1 is less than or equal to 0, the vehicle controller reduces its heat dissipation power after a preset time.

[0040] In one alternative implementation, the on-board controller is configured to acquire the heat dissipation gap of the dual-winding permanent magnet generator: P 0= K 1* K 4* (3*) I 2 * R ), K 4 > 1; P 0= K 1* (3*) I 2 * R ), K 4≤1; in, P 0 represents the heat dissipation gap in the dual-winding permanent magnet generator. K 1 is the thermal expansion coefficient. K 4 represents the power change proportionality coefficient. I This represents the increment of the current under the current command. R This is the total resistance of the generator windings.

[0041] In this embodiment, the number 3 in the formula for calculating the heat dissipation gap of the dual-winding permanent magnet generator corresponds to the heat calculation coefficient of the three-phase generator, and the dual-winding permanent magnet generator is a three-phase generator.

[0042] In this embodiment, K 4 is definitely greater than 100%, therefore, by increasing... K 4. This increases the heat dissipation gap, thereby increasing the heat dissipation power of the fan and water pump, and ensuring improved heat dissipation effect.

[0043] In one alternative implementation, when K 0 when the power change ratio is within the first preset range or the second preset range. K 1 is the first preset value; when K When the power change ratio is within the third preset range, K 1 is the second preset value; when K When the power change ratio is within the fourth preset range, K 1 is the third preset value; the first preset power change ratio range, the second preset power change ratio range, the third preset power change ratio range, and the fourth preset power change ratio range are sequentially continuous ranges; the first preset value is less than the second preset value and less than the third preset value.

[0044] In this embodiment, by K 0 indicates the power change of the power system. The more drastic the change, the greater the thermal expansion coefficient is required. By combining the thermal expansion coefficient with the power change ratio coefficient, the heat dissipation gap is increased.

[0045] In this embodiment, the first preset power change ratio range can be 0-20, the second preset power change ratio range can be 20-30, the third preset power change ratio range can be 30-50, and the fourth preset power change ratio range can be greater than 50. The maximum and minimum values ​​of the first preset power change ratio range can both be taken, the maximum value of the second preset power change ratio range can be taken, but the minimum value cannot be taken, and the maximum value of the third preset power change ratio range can be taken, but the minimum value cannot be taken.

[0046] In the article "Characteristic Analysis of Phase-Shifted Dual-Winding Permanent Magnet Motor for Electric Propulsion Aircraft" published in Acta Aeronautica Sinica, 2022, 43(5): 325230, a dual-winding motor was proposed. The temperature rise test curve shows that the temperature rises from 20 degrees to a peak of 40 degrees and then fluctuates around the peak of 40 degrees. It can be concluded that the sudden increase in temperature is about twice, that is, the heat that needs to be dissipated needs to be doubled.

[0047] In this embodiment, the first preset value can be 1.8, corresponding to a small power change; the second preset value can be 2, corresponding to a normal power change; and the third preset value can be 3, considering the most extreme value, to expand the heat dissipation gap.

[0048] In this embodiment, the copper loss of the dual-winding motor is greater than that of the single-winding motor. Therefore, it is necessary to increase the heat dissipation gap by a first preset value to ensure that the temperature rise caused by local heat accumulation is reduced during heat dissipation. Furthermore, the more drastic the power change of the power system, the greater the thermal expansion coefficient is required.

[0049] In this embodiment, a greater amount of heat needs to be dissipated initially, so the thermal expansion coefficient is... K 1. Preset from version 1.5, when K When the value is greater than 50%, it indicates a large power change, which exacerbates local heat accumulation and increases the thermal expansion coefficient. K 1 can be directly changed to twice the first preset value to obtain a larger heat dissipation gap, which facilitates the improvement of heat dissipation effect and prevents local heat accumulation.

[0050] In this embodiment, no method is used. PID The reason for the adjustment is that PID Adjustment takes time and has a lag.

[0051] In one optional implementation, the on-board controller is configured to control the cooling power of the fan and water pump for heat dissipation based on the heat dissipation gap of the dual-winding permanent magnet generator; the cooling power of the water pump and the cooling power of the fan are: P 水泵 = K 5* P 0; P风扇 = K 6* P 0; in, P 水泵 This refers to the heat dissipation power of the water pump, i.e., the heat dissipation of the water pump. P 风扇 This refers to the fan's cooling power, or the amount of heat dissipated by the fan. K 5 represents the heat dissipation ratio required by the water pump; K 6 represents the required cooling ratio for the fan; K 2 = ( P 水泵 * n 1) / P 5; in, P 5 represents the full-load heat dissipation power of the water pump, that is, the heat dissipation power of the water pump at full speed. K 2 represents the water pump speed; n 1 represents the maximum speed of the water pump; K 3 = ( P 风扇 * n 2) / P 6; in, P 6 represents the fan's full-load cooling power, i.e., the cooling power of the fan at full speed. K 3 represents the fan speed; n 2 represents the maximum fan speed; the vehicle controller is configured to control the water pump and fan based on the water pump speed and fan speed for heat dissipation.

[0052] In one alternative implementation, P 5 and P All 6 are calibrated based on the maximum heat load of the entire vehicle, with the maximum heat load of the entire vehicle as a preset ratio. P 2. The preset ratio can be 50-60%; the vehicle controller has pre-stored the corresponding cooling ratio required for the water pump and the cooling ratio required for the fan.

[0053] In this embodiment, the maximum cooling power of the water pump and fan provided by the OEM exceeds the cooling design requirements, and can be calibrated quickly and easily by using the maximum heat load of the vehicle to calibrate the cooling power of the water pump and fan at full speed.

[0054] In one alternative implementation, when K 0 When the first preset power change ratio range is reached, at this time K 5 represents the first preset water pump cooling ratio. K6 represents the first preset fan cooling ratio, the first preset water pump cooling ratio is greater than the first preset fan cooling ratio, and the sum of the first preset fan cooling ratio and the first preset water pump cooling ratio is 100%. when K When the second preset power change ratio is within 0, at this time K 5 represents the second preset water pump cooling ratio. K 6 represents the second preset fan cooling ratio, the second preset water pump cooling ratio is greater than the second preset fan cooling ratio, and the sum of the second preset fan cooling ratio and the second preset water pump cooling ratio is 100%, and the first preset water pump cooling ratio is greater than the second preset water pump cooling ratio. when K When the power change ratio is within the third preset range, at this time... K 5 represents the third preset water pump cooling ratio. K 6 represents the third preset fan cooling ratio, the third preset water pump cooling ratio is equal to the third preset fan cooling ratio, and the sum of the third preset fan cooling ratio and the third preset water pump cooling ratio is 100%. when K When the power change ratio is within the fourth preset range, at this time... K 5 represents the fourth preset water pump cooling ratio. K 6 represents the fourth preset fan cooling ratio. The fourth preset water pump cooling ratio is greater than the fourth preset fan cooling ratio, and the sum of the fourth preset fan cooling ratio and the fourth preset water pump cooling ratio is greater than 100%.

[0055] In this embodiment, the first preset water pump heat dissipation ratio can be 80%, and the first preset fan heat dissipation ratio can be 20%. At this time, the power change ratio of the power system is relatively low, the water pump is the main heat dissipation device, and the water pump can dissipate heat first.

[0056] In this embodiment, the second preset water pump heat dissipation ratio can be 60%, and the second preset fan heat dissipation ratio can be 40%. At this time, the power change ratio of the power system is relatively low, the water pump is the main heat dissipation device, and the water pump can dissipate heat first.

[0057] In this embodiment, the third preset water pump cooling ratio can be 50%, and the third preset fan cooling ratio can be 50%. At this time, the power change ratio of the power system is moderate, and the water pump and fan are simultaneously under load for heat dissipation.

[0058] In this embodiment, the fourth preset water pump cooling ratio can be 60%, and the fourth preset fan cooling ratio can be 60%. At this time, the power of the power system changes drastically, and the water pump and fan are simultaneously under load to dissipate heat, providing a stronger cooling effect.

[0059] At least one other disclosed embodiment also provides a method of operating the above-described heat dissipation system for localized heat accumulation in a dual-winding permanent magnet generator, comprising: When both generating windings 1 generate electricity simultaneously, the vehicle controller obtains the heat dissipation gap of the dual-winding permanent magnet generator according to the proportion of power change in the power system, and then controls the cooling power of the fan and water pump to dissipate heat according to the heat dissipation gap of the dual-winding permanent magnet generator.

[0060] In summary, the heat dissipation system for localized heat accumulation in a dual-winding permanent magnet generator uses an on-board controller to determine the heat dissipation gap of the dual-winding permanent magnet generator based on the ratio of power change in the power system when both generating windings 1 are generating power simultaneously. Then, based on the heat dissipation gap of the dual-winding permanent magnet generator, the cooling power of the fan and water pump is controlled to dissipate heat, thereby increasing the cooling power of the fan and water pump to improve the heat dissipation effect, avoid localized heat accumulation that could cause the temperature to rise and exceed the upper limit of the temperature resistance, and ensure the performance of the dual-winding permanent magnet generator.

[0061] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A heat dissipation system for localized heat accumulation in a dual-winding permanent magnet generator, characterized in that, include: The vehicle-mounted controller, and a dual-winding permanent magnet generator, a fan, and a water pump electrically connected to the vehicle-mounted controller; The fan and water pump are configured to cool the dual-winding permanent magnet generator. The stator core slots of the dual-winding permanent magnet generator are each equipped with two sets of stacked windings. The windings of the same layer in each stator core slot constitute a generator winding (1). The two generator windings (1) are respectively connected to two independent three-phase rectifier bridges. The output terminals of the two three-phase rectifier bridges are connected in series, and the two generator windings (1) generate electricity at the same time. The vehicle controller is configured to obtain the heat dissipation gap of the dual-winding permanent magnet generator according to the proportion of power change of the power system when the two generating windings (1) generate electricity at the same time, and then control the heat dissipation power of the fan and / or water pump to dissipate heat according to the heat dissipation gap of the dual-winding permanent magnet generator.

2. The heat dissipation system for localized heat accumulation in a dual-winding permanent magnet generator as described in claim 1, characterized in that: The on-board controller is configured to detect the heat dissipation gap of the dual-winding permanent magnet generator: P 0= K 1* K 4*（3* I 2 * R ）， K 4＞1； P 0= K 1*（3* I 2 * R ）， K 4≤1； in, P 0 represents the heat dissipation gap in the dual-winding permanent magnet generator. K 1 is the thermal expansion coefficient. K 4 represents the power change proportionality coefficient. I This represents the increment of the current under the current command. R This is the total resistance of the generator windings.

3. The heat dissipation system for localized heat accumulation in a dual-winding permanent magnet generator as described in claim 2, characterized in that: The vehicle controller is configured to acquire a power change ratio coefficient and determine whether the power change ratio coefficient is substituted into the formula used to acquire the heat dissipation gap of the dual-winding permanent magnet generator. The power change ratio coefficient K The formula for calculating 4 is: K 4 = ( T 1 / T 0) * 100%; in, T 1 represents the completion time of the power system's power requirement under the current command. T 0 represents standard time; when K When 4 is greater than 1, K 4. Substitute into the formula used to obtain the heat dissipation gap of the dual-winding permanent magnet generator; otherwise, K 4. Remove.

4. The heat dissipation system for localized heat accumulation in a dual-winding permanent magnet generator as described in claim 2, characterized in that: The on-board controller is configured to acquire the proportion of power system power changes: K 0=（ P 1 / P 2）*100%； in, K 0 represents the proportion of power change in the power system; P 1 represents the increment of the power system's output under the current command; P 2 represents the rated power of the power system; P 1 = P 3- P 4； in, P 3 represents the power requirement of the power system under the current command. P 4 represents the power of the power system at the previous moment; The power system refers to the vehicle's power system.

5. The heat dissipation system for localized heat accumulation in a dual-winding permanent magnet generator as described in claim 4, characterized in that: The vehicle controller is configured to... P When 1 is greater than 0, the proportion of the power change in the power system is obtained. P When 1 is less than or equal to 0, the vehicle controller reduces its heat dissipation power after a preset time.

6. The heat dissipation system for localized heat accumulation in a dual-winding permanent magnet generator as described in claim 5, characterized in that: when K 0 when the power change ratio is within the first preset range or the second preset range. K 1 is the first preset value; when K When the power change ratio is within the third preset range, K 1 is the second preset value; when K When the power change ratio is within the fourth preset range, K 1 is the third preset value; The first preset power change ratio range, the second preset power change ratio range, the third preset power change ratio range, and the fourth preset power change ratio range are sequentially consecutive ranges. The first preset value is less than the second preset value and less than the third preset value.

7. The heat dissipation system for localized heat accumulation in a dual-winding permanent magnet generator as described in claim 5, characterized in that: The on-board controller is configured to control the cooling power of the fan and water pump for heat dissipation based on the heat dissipation gap of the dual-winding permanent magnet generator. The cooling power of the water pump and the cooling power of the fan are: P 水泵 = K 5* P 0； P 风扇 = K 6* P 0； in, P 水泵 This refers to the heat dissipation power of the water pump; P 风扇 This refers to the cooling power of the fan; K 5 represents the heat dissipation ratio required by the water pump; K 6 represents the required cooling ratio for the fan; K 2=（ P 水泵 * n 1） / P 5； in, P 5 represents the full-load heat dissipation power of the water pump, that is, the heat dissipation power of the water pump at full speed. K 2 represents the water pump speed; n 1 represents the maximum speed of the water pump; K 3=（ P 风扇 * n 2） / P 6； in, P 6 represents the fan's full-load cooling power, i.e., the cooling power of the fan at full speed. K 3 represents the fan speed; n 2 represents the maximum fan speed; The vehicle controller is configured to control the cooling of the water pump and fan based on the water pump speed and fan speed.

8. The heat dissipation system for localized heat accumulation in a dual-winding permanent magnet generator as described in claim 7, characterized in that: P 5 and P All 6 are calibrated based on the maximum heat load of the entire vehicle, with the maximum heat load of the entire vehicle as a preset ratio. P 2.

9. The heat dissipation system for localized heat accumulation in a dual-winding permanent magnet generator as described in claim 7, characterized in that: when K 0 When the first preset power change ratio range is reached, at this time K 5 represents the first preset water pump cooling ratio. K 6 represents the first preset fan cooling ratio, the first preset water pump cooling ratio is greater than the first preset fan cooling ratio, and the sum of the first preset fan cooling ratio and the first preset water pump cooling ratio is 100%. when K When the second preset power change ratio is within 0, at this time K 5 represents the second preset water pump cooling ratio. K 6 represents the second preset fan cooling ratio, the second preset water pump cooling ratio is greater than the second preset fan cooling ratio, and the sum of the second preset fan cooling ratio and the second preset water pump cooling ratio is 100%, and the first preset water pump cooling ratio is greater than the second preset water pump cooling ratio. when K When the power change ratio is within the third preset range, at this time... K 5 represents the third preset water pump cooling ratio. K 6 represents the third preset fan cooling ratio, the third preset water pump cooling ratio is equal to the third preset fan cooling ratio, and the sum of the third preset fan cooling ratio and the third preset water pump cooling ratio is 100%. when K When the power change ratio is within the fourth preset range, at this time... K 5 represents the fourth preset water pump cooling ratio. K 6 represents the fourth preset fan cooling ratio. The fourth preset water pump cooling ratio is greater than the fourth preset fan cooling ratio, and the sum of the fourth preset fan cooling ratio and the fourth preset water pump cooling ratio is greater than 100%.

10. A method for operating a heat dissipation system for localized heat accumulation in a dual-winding permanent magnet generator as described in claim 1, characterized in that, include: When the two generating windings (1) generate electricity simultaneously, the vehicle controller obtains the heat dissipation gap of the dual-winding permanent magnet generator according to the ratio of power change of the power system, and then controls the heat dissipation power of the fan and water pump according to the heat dissipation gap of the dual-winding permanent magnet generator for heat dissipation.

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