CN110022034B - Cooling oil circuit system integrating motor and drive controller - Google Patents
Cooling oil circuit system integrating motor and drive controller Download PDFInfo
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- CN110022034B CN110022034B CN201910182567.8A CN201910182567A CN110022034B CN 110022034 B CN110022034 B CN 110022034B CN 201910182567 A CN201910182567 A CN 201910182567A CN 110022034 B CN110022034 B CN 110022034B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
Abstract
The invention discloses a cooling oil circuit system integrating a motor and a drive controller, which comprises: the oil collecting cavity is integrated with a stator cooling oil way, a rotor cooling oil way and a controller cooling oil way; the oil collecting cavity is used for collecting the stator cooling oil path, the rotor cooling oil path and the controller cooling oil path, so that the stator, the rotor and the driving controller of the motor can be cooled simultaneously on the occasion with limited space, and the heat of heating elements in the motor and the controller can be rapidly taken away. According to the invention, the pressure drop of the high-pressure area and the low-pressure area of the oil collecting cavity is utilized to provide cooling oil for the rotor cooling oil path, so that the system is very compact and has high reliability; the low-pressure area of the oil collecting cavity is directly connected with the cooling oil path of the controller, so that the system is more integrated, the stator cooling oil path, the rotor cooling oil path and the cooling oil path of the controller are collected to the low-pressure area of the oil collecting cavity and then flow out of the whole oil cooling system from a main outlet in the low-pressure area, and the system is very integrated and compact.
Description
Technical Field
The invention belongs to the technical field of motor cooling, and particularly relates to a cooling oil way system integrating a motor and a drive controller.
Background
The high-power density motor has the characteristic of outputting larger power per unit volume or per unit weight, is particularly suitable for occasions with strict requirements on the volume and the weight of the motor, such as aerospace, electric automobiles and the like, has high power and relatively small heat dissipation area, is generally not suitable for forced air cooling, and generally adopts an oil cooling or water cooling mode to cool heating parts for a motor body and a driving controller. Compared with water cooling, the cooling liquid can directly contact with a heating part by using oil cooling, the heat dissipation effect is good, the temperature of motor parts such as iron cores, windings, magnetic steel and driver chips can be greatly reduced,
and the cooling oil is insulated, and is widely adopted in occasions with high requirements on safety, such as aerospace and the like, and an oil cooling system is safer than a water cooling system. For a motor and a drive controller system, the parts to be cooled are more, a motor stator core and a winding, rotor magnetic steel and a driver are provided, if a common separated pipeline is adopted for connection, the pipelines and joints are prone to being numerous, oil pipes are complex in wiring, on one hand, the safety of a cooling oil path system is reduced, the failure rate is increased, on the other hand, in the occasions such as aviation and the like with strict limitation on the space and the weight of the motor system, the separated oil path connection system is not installed normally, and the weight of the system can be increased due to the numerous joints, so that an integrated cooling oil path system must be designed, the temperature of the motor and the temperature of the driver can be effectively reduced, and the high integration level, the simplicity and the high reliability of the oil cooling system pipeline can be ensured.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a cooling oil way system integrating a motor and a drive controller, and aims to solve the technical problem of low cooling efficiency in the prior art.
The invention provides a cooling oil circuit system integrating a motor and a drive controller, which comprises: the oil collecting cavity is integrated with a stator cooling oil way, a rotor cooling oil way and a controller cooling oil way; the oil collecting cavity is used for collecting the stator cooling oil path, the rotor cooling oil path and the controller cooling oil path, so that the stator, the rotor and the driving controller of the motor can be cooled simultaneously on the occasion with limited space, and the heat of heating elements in the motor and the controller can be rapidly taken away. When the cooling oil way system works, cooling oil enters the stator cooling oil way from an oil inlet, flows into the high-pressure area cavity of the oil converging cavity and the controller cooling oil way from an oil outlet of the stator cooling oil way, converges in the low-pressure area cavity of the oil converging cavity, and then flows out from an outlet of the cooling oil way system.
The invention discloses a cooling oil circuit system integrating a motor and a drive controller, which has the integrated advantage, can simultaneously cool a stator, a rotor and the drive controller of the motor on the occasion with limited space, further improves the overall power density of the motor and the drive controller, simultaneously leads the oil circuit of the system to be more compact, and has higher reliability compared with a plurality of separated pipe joints. The integrated cooling oil way structure ensures that the heat of heating elements in the motor and the controller is quickly taken away, and each part works in a reliable working temperature range, so that the reliability and the power density of the system are improved simultaneously.
Further, the oil collecting chamber includes: the high-pressure area cavity and the low-pressure area cavity are symmetrically arranged, and holes for cooling oil to pass through are formed in the symmetrical surfaces of the high-pressure area cavity and the low-pressure area cavity; the high-pressure area cavity is provided with an oil inlet and two oil outlets, and the oil inlet of the high-pressure area cavity is arranged on the asymmetrical surface of the high-pressure area cavity and is used for being communicated with the oil outlets of the stator cooling oil path; the first oil outlet of the high-pressure area cavity is arranged on the symmetrical surface of the high-pressure area cavity and is used for being communicated with the oil inlet of the rotor cooling oil path; the second oil outlet of the high-pressure area cavity is arranged on the symmetrical surface of the high-pressure area cavity and is used for being communicated with the first oil inlet of the low-pressure area cavity; the low-pressure area cavity is provided with two oil inlets and one oil outlet, and a second oil inlet of the low-pressure area cavity is communicated with the oil outlet of the rotor cooling oil path; a third oil inlet of the low-pressure area cavity is communicated with an oil outlet of a cooling oil way of the controller; and an oil outlet of the low-pressure area cavity is used as an outlet of the cooling oil path system.
Still further, the stator cooling oil passage includes: the oil inlet, the oil outlet and the oil isolating ring; the oil-separating ring is coaxially arranged with the machine shell, the outer wall of the oil-separating ring is matched with the interior of the iron core of the stator, and a plurality of holes for cooling oil to pass through are formed in the yoke part of the iron core of the stator; the oil inlet is arranged on the front end cover and is used for providing an inlet for cooling oil; the oil outlet is arranged on the rear end cover and used for providing an outlet for the cooling oil.
The oil inlet of the stator cooling oil way is an inlet of the whole cooling oil way system; and an oil outlet of the stator cooling oil way is connected with the high-pressure area of the oil collecting cavity. The specific connection mode is as follows: the oil outlet of the stator oil path is covered at the rear end, the oil outlet is in a pipe joint form, and is connected with the pipe joint fixed on the high-pressure area of the oil collecting cavity through the oil pipe, the stator oil path and the oil collecting cavity are integrated together in the connecting mode, so that the system is simpler, the number of pipelines and joints is reduced, and the arrangement difficulty of an oil path system is reduced.
Furthermore, the stator cooling oil path is provided with four oil outlets which are respectively and uniformly distributed along the circumferential direction of the rear end cover, wherein three oil outlets are communicated with the high-pressure area of the oil collecting cavity, and one oil outlet is communicated with the oil inlet of the controller cooling oil path.
Further, the rotor cooling oil passage includes: the oil inlet, the shaft of the rotor, the oil outlet and the oil conveying pipe; the shaft of the rotor is of a hollow structure and one end of the shaft is opened along the axial direction; the oil delivery pipe is coaxially arranged in the hollow structure of the shaft of the rotor, the outer diameter of the oil delivery pipe is smaller than the diameter of the hollow structure, and a passage in the oil delivery pipe and between the outer wall of the oil delivery pipe and the inside of the hollow structure is used as a passage of cooling oil; one end of an oil inlet of the rotor cooling oil way is communicated with the high-pressure area cavity of the oil collecting cavity, and the other end of the oil inlet of the rotor cooling oil way is communicated with the oil conveying pipe; one end of an oil outlet of the rotor cooling oil way is communicated with a passage between the outer wall of the oil conveying pipe and the interior of the hollow structure, and the other end of the oil outlet of the rotor cooling oil way is communicated with a low-pressure area cavity of the oil collecting cavity.
The inlet end face of the oil delivery pipe is coincided with a hole in a high-pressure area of the oil collecting cavity, so that cooling oil can smoothly enter the rotor oil delivery pipe from the high-pressure area of the oil collecting cavity, the oil delivery pipe is inserted into the rotor semi-hollow shaft, the central lines of the oil delivery pipe and the rotor semi-hollow shaft are coincided, the end part of the oil delivery pipe is away from oil in the rotor semi-hollow shaft by a certain distance, so that the cooling oil can conveniently flow into an inner hole of the shaft from the oil delivery pipe, the cooling shaft is fixed at the end part of the shaft in a dynamic seal mode and is in contact with and fixed with a support ring of a controller radiator to prevent the cooling oil from flowing out of the shaft and form an oil passage, the cooling oil flows out of the semi-hollow shaft and enters the oil passage in the support ring of the controller radiator, and the oil. The design has the advantages that the rotor oil way and the oil collecting cavity can be highly integrated, so that the system is simpler, the number of pipelines and joints is reduced, and the arrangement difficulty of an oil way system is reduced.
Further, the controller cooling oil passage includes: the cooling oil pump comprises an oil inlet, an oil outlet, a first cavity, a second cavity and holes, wherein the first cavity and the second cavity are symmetrically and tightly arranged, and the holes are formed in the symmetrical surfaces of the first cavity and the second cavity and used for allowing cooling oil to pass through; one end of an oil inlet of the controller cooling oil way is arranged on the asymmetric surface of the first cavity, and the other end of the oil inlet of the controller cooling oil way is communicated with an outlet of the stator cooling oil way; one end of an oil outlet of the controller cooling oil path is arranged on the asymmetric surface of the second cavity, and the other end of the oil outlet of the controller cooling oil path is communicated with the low-pressure area of the oil collecting cavity.
An oil outlet of the controller cooling oil way is connected with a low-pressure area of the oil collecting cavity, an oil inlet of the controller cooling oil way is connected with an oil outlet of the stator oil way, and a part of oil in the stator oil way is taken to enter the controller to cool the controller; the oil duct partition divides the controller oil path into an upper cavity and a lower cavity, so that cooling oil can flow from the controller oil path, holes for oil circulation are formed in the partition of the oil duct, the cooling oil can flow into the lower cavity from the upper cavity, the partition is arranged between the controller oil path and the oil collecting cavity, holes for oil fluid are formed in the partition between the lower cavity of the controller oil path and the oil collecting cavity low-pressure area, and the cooling oil in the controller can flow into the oil collecting cavity low-pressure area and then flows out of the system from the oil collecting cavity low-pressure area.
The invention has good heat dissipation effect and compact structure, the integral cooling oil circuit system is highly integrated, the volume and the weight of the system are reduced, and the difficulty of system arrangement is greatly reduced.
In the invention, the high-pressure area of the oil collecting cavity collects the oil discharged from the stator cooling oil circuit, and then the oil is concentrated and flows out of the system from the low-pressure main oil outlet of the oil collecting cavity; the high pressure area of the oil collecting cavity is connected with an oil inlet of a rotor cooling oil path, the low pressure area is connected with an oil outlet, and cooling oil is provided for the rotor cooling oil path by utilizing the pressure drop of the high pressure area and the low pressure area of the oil collecting cavity, so that the system is very compact and high in reliability; the low-pressure area of the oil collecting cavity is directly connected with the cooling oil path of the controller, so that the system is more integrated, the stator cooling oil path, the rotor cooling oil path and the cooling oil path of the controller are collected to the low-pressure area of the oil collecting cavity and then flow out of the whole oil cooling system from a main outlet in the low-pressure area, and the system is very integrated and compact. On the other hand, the oil collecting cavity is not a separate space but a part of the controller radiator, so that the heat can be dissipated for the controller power module, and the power density of the motor system and the integration level of the system are further improved.
Through the technical scheme, compared with the prior art, the invention has the following technical advantages:
(1) the stator cooling oil way and the oil collecting cavity are integrated, so that the oil way is uniformly distributed, and the structure is compact. Specifically, the oil collecting cavity plays a role in collecting the oil discharged from the cooling oil circuit of the motor stator, so that on one hand, the pressure of the oil outlet of the stator is balanced, the cooling oil circuit of the stator is more uniformly distributed, on the other hand, the design of pipelines and pipe joints is greatly reduced, the system is simplified, and the structure is compact; if the integrated cooling oil way scheme is not adopted, the volume of the whole cooling oil way system is increased, and the weight is also increased, so that the power density of the system is reduced. In the case of motor systems that are subject to strict space constraints, separate stator cooling oil circuits cannot meet the requirements.
(2) The invention simplifies the system and has high reliability by integrating the rotor cooling oil way and the oil collecting cavity.
Specifically, the space of the rotor cooling oil path is very narrow, the space for installing an oil pipe of the rotor cooling oil path to enter and exit a joint is limited, and the rotor cooling oil path and the oil collecting cavity are inconvenient to integrate and design, so that a very good solution is provided, and a certain amount of cooling oil is provided for the rotor cooling oil path by utilizing the pressure difference between a high-pressure area and a low-pressure area of the oil collecting cavity. The structure is very compact, the design of pipelines and pipe joints is reduced, the system is simplified, and the reliability is high. If the integrated cooling oil way scheme is not adopted, the volume of the whole cooling oil way system is increased, and the weight is also increased, so that the power density of the system is reduced. The space of the rotor in the motor with higher power density is very compact, if a rotor oil cooling scheme is needed, the integrated cooling design is very important, and the separated rotor cooling oil path can not meet the space limitation.
(3) The invention further improves the heat dissipation capacity by integrating the cooling oil way of the controller with the oil collecting cavity.
Specifically, the outlet of the controller cooling oil path is connected with the low-pressure area of the oil collecting cavity, the design of pipelines and pipe joints is reduced, the system is simplified, the structure is compact, meanwhile, the oil collecting cavity is a part of the controller radiator, the controller can be radiated, the radiating capacity of the controller radiator is further improved, the power density of the controller can be made higher, and the problem of heat radiation of the controller is the important aspect of limiting the improvement of the power density of the controller. If the integrated design is not adopted, on one hand, the heat dissipation capacity of the controller is reduced, on the other hand, the volume and the weight of the cooling oil path system are increased, and the limitation of the space and the weight of the motor system is difficult to meet.
(4) The invention simplifies the system by designing the structure of the oil collecting cavity, has compact structure, further improves the integration level of the system and improves the power density of the system.
Specifically, the oil collecting cavity is designed to provide an integrated interface for a stator cooling oil path, a rotor cooling oil path and a controller cooling oil path of the motor, so that the whole oil cooling system is integrated together through the oil collecting cavity, and if the oil collecting cavity is not provided, the stator cooling oil path, the rotor cooling oil path and the controller cooling oil path of the motor are highly integrated together, which is very difficult. The oil collecting cavity, a stator cooling oil path, a rotor cooling oil path and a controller cooling oil path of the motor are designed in a highly integrated manner, so that the design of pipelines and pipe joints is reduced, the system is simplified, the structure is compact, the space and weight limitations of the motor system can be met, and the reliability is high; meanwhile, the oil collecting cavity is not a single space, but is designed to be a part of a controller radiator, so that heat can be dissipated for power devices of the controller, the integration level of the system is further improved, and the power density of the system is improved.
Drawings
Fig. 1 is a schematic structural diagram of a cooling oil path system integrated with a motor and a drive controller according to an embodiment of the present invention;
fig. 2 is a schematic view of a connection structure of a motor stator, a rotor cooling oil path and an oil collecting cavity in a cooling oil path system integrated with a motor and a drive controller provided by an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an oil collecting cavity in a cooling oil circuit system integrated by a motor and a drive controller and an internal oil circuit of a controller radiator provided in an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention discloses a cooling oil path system integrating a motor and a drive controller; the system comprises four oil paths: the stator cooling oil path, the rotor cooling oil path, the controller cooling oil path and the oil collecting cavity are connected with the oil collecting cavity to form an integrated cooling oil path system, and the structure is very compact. The structure ensures that the oil cooling system has high pipeline integration level, simple system and high reliability, improves the cooling efficiency of the motor and the drive controller, reduces the temperature of the motor and the drive controller and ensures the safe operation of the motor system.
The cooling oil path system integrated with the motor and the drive controller provided by the invention is shown in fig. 1, and consists of four oil paths: the cooling oil circuit of the motor stator, the cooling oil circuit of the rotor, the cooling oil circuit of the controller and the oil collecting cavity. The cooling oil firstly enters a motor stator cooling oil path from a motor stator oil inlet and then comes out from an end cover at the other end of the motor, the number of outlets is four, three outlets are connected with a high-pressure area of an oil converging cavity, the remaining outlet is connected with an inlet of a controller cooling oil path to supply oil for the controller, an inlet of a rotor cooling oil path is connected with the high-pressure area of the oil converging cavity, an outlet is connected with a low-pressure area of the oil converging cavity, and an outlet of the controller cooling oil path is connected with the low-pressure area of the oil converging cavity. The motor stator cooling oil path, the rotor cooling oil path and the controller cooling oil path are converged in the low-pressure area of the oil converging cavity and flow out of the motor and controller integrated cooling oil path system from a main outlet.
For the motor and the drive control system designed at this time, the main loss is divided into four parts: the motor stator iron loss and copper loss, the rotor magnetic steel eddy current loss and the controller power device loss need to design cooling oil paths to cool the heating element, so that the heating element can work in a safe range, and the oil collecting cavity is designed to integrate the whole cooling oil path system. In the four oil paths, a stator cooling oil path is composed of a motor shell and an oil-isolating ring, and cooling oil directly flows through a yoke part of a stator core and the end part of a winding and can directly cool heating elements of the stator such as the stator core and the winding; the rotor cooling oil circuit consists of a semi-hollow rotating shaft and an oil delivery pipe inserted into the shaft; the controller cooling oil path is arranged in the controller radiator and is divided into an upper cavity and a lower cavity; the oil collection cavity is arranged in the controller radiator and is divided into two areas, namely an oil collection cavity high-pressure area and an oil collection cavity low-pressure area, as shown in figures 1 and 2.
The integrated oil cooling structure provided by the invention is very compact, the stator, the rotor and the drive controller of the motor can be effectively cooled at the same time, the whole motor and the drive control system are compact in structure, and the whole power density is further improved.
In the embodiment of the invention, the design of a stator cooling oil path is shown as a dotted line frame at the upper left of figure 1, a stator cooling channel consists of the inner wall surface of a machine shell, the inner surface of a front end cover, the inner surface of a rear end cover, an oil isolating ring and a hole of a stator core yoke part, cooling oil enters a motor stator from an oil inlet on the front end cover, firstly impacts the end part of a motor winding to cool the end part of the winding, then flows through the channel of the stator core yoke part, namely the hole of the stator core yoke part, and cools the stator core, and the heat of an in-slot winding, namely stator copper loss of the motor, is also mostly conducted into the stator; after flowing through the channel of the iron core yoke, the cooling oil reaches the other end part of the winding to cool the winding end part of the motor, and then leaves the stator cooling oil path from an oil outlet on the rear end cover of the motor. In order to ensure that the flow of the cooling oil of the stator cooling oil path is distributed as uniform as possible in the circumferential direction, the number of outlets of the motor oil path is generally not less than four, if the four outlets are respectively discharged, four pipe joints are needed and are very complicated, if a 5-way joint is used, a large part of space and weight are occupied, and the structure is complicated, so that an oil collecting cavity is designed to collect the oil at the outlets of the motor, the oil flows out of the cooling oil path system from one pipe together, and the task of collecting the oil discharged from the motor stator is borne.
The invention integrates the stator cooling oil circuit and the oil collecting cavity, and aims to ensure that the oil circuit is uniformly distributed and has compact structure. Specifically, the oil collecting cavity plays a role in collecting the oil discharged from the cooling oil circuit of the motor stator, so that on one hand, the pressure of the oil outlet of the stator is balanced, the cooling oil circuit of the stator is more uniformly distributed, on the other hand, the design of pipelines and pipe joints is greatly reduced, the system is simplified, and the structure is compact; if the integrated cooling oil way scheme is not adopted, the volume of the whole cooling oil way system is increased, and the weight is also increased, so that the power density of the system is reduced. In the case of motor systems that are subject to strict space constraints, separate stator cooling oil circuits cannot meet the requirements.
In the embodiment of the present invention, the integration of the rotor cooling oil path and the oil collecting chamber is shown in fig. 2 and 3, the rotor cooling oil path is shown in fig. 2, and the rotor cooling oil path includes: the oil inlet, the shaft of the rotor, the oil outlet and the oil conveying pipe; the shaft of the rotor is of a hollow structure and one end of the shaft is opened along the axial direction; the oil delivery pipe is coaxially arranged in the hollow structure of the shaft of the rotor, the outer diameter of the oil delivery pipe is smaller than the diameter of the hollow structure, and a passage in the oil delivery pipe and between the outer wall of the oil delivery pipe and the inside of the hollow structure is used as a passage of cooling oil; one end of an oil inlet of the rotor cooling oil way is communicated with the high-pressure area cavity of the oil collecting cavity, and the other end of the oil inlet of the rotor cooling oil way is communicated with the oil conveying pipe; one end of an oil outlet of the rotor cooling oil way is communicated with a passage between the outer wall of the oil conveying pipe and the interior of the hollow structure, and the other end of the oil outlet of the rotor cooling oil way is communicated with a low-pressure area cavity of the oil collecting cavity. The flow path of the cooling oil is shown by the arrows in fig. 2. The cooling oil gets into defeated oil pipe by controller radiator end face hole from the high-pressure district that gathers the oil chamber, then flow rotor cavity internal face, the cooling rotor, the loss of whole rotor, mainly the heat that the eddy current loss of magnet steel produced is epaxial through the heat conduction, then take away by the cooling oil, the cooling oil flows after rotor cavity internal face, flow controller radiator support ring internal surface, then flow the low-pressure region that gathers the oil chamber from the semicircular ring shape hole of controller radiator end face, outflow rotor cooling oil circuit. The space at the position of a rotor oil delivery pipe is very narrow, the space for installing an oil pipe joint of a rotor cooling oil way is limited, and the rotor cooling oil way is very inconvenient, and the problem that the oil pipe joint is inconvenient to install due to the fact that the space at the position of an inlet and an outlet of the rotor cooling oil way is more integrated and compact and the reliability is higher is solved because the rotor cooling oil way can drive a certain amount of cooling oil to flow into a cavity of a rotor only by a certain pressure difference, an oil collecting cavity is designed into two cavities, one high pressure is called as a high pressure area of the oil collecting cavity, and the other low pressure is called as a low pressure area of the oil collecting cavity, as shown in figures 1 and 2.
In the embodiment of the invention, the integration of the controller cooling oil path and the oil converging cavity and the design of the controller cooling oil path are shown in figures 2 and 3, the controller radiator is a cuboid cavity, a partition plate is arranged in the middle of the controller radiator and divides the controller cooling oil path into an upper cavity and a lower cavity, a hole is formed in the partition plate, the upper cavity and the lower cavity are communicated to form an oil path, an oil outlet of the controller cooling oil path is connected with a low-pressure area of the oil converging cavity, the use of pipelines and pipe joints is reduced, and the system is more integrated and compact and has higher reliability.
In the embodiment of the invention, as shown in fig. 2, an oil collecting cavity is a part of a cavity of a controller radiator, the oil collecting cavity is separated from an oil path of the controller radiator by a partition plate, the oil collecting cavity is divided into two parts by the partition plate, one part is a high-pressure area of the oil collecting cavity, the other part is a low-pressure area of the oil collecting cavity, and an opening is formed in the middle partition plate to connect the high-pressure area and the low-pressure area to form the oil path of the oil collecting cavity, as shown in fig. 2. The oil collecting cavity is used for collecting the stator cooling oil way, the rotor cooling oil way and the controller cooling oil way, firstly, the high-pressure area of the oil collecting cavity collects the oil discharged from the stator cooling oil way, and then the oil is concentrated and flows out of the system from the low-pressure main oil outlet of the oil collecting cavity; the high pressure area of the oil collecting cavity is connected with an oil inlet of a rotor cooling oil path, the low pressure area is connected with an oil outlet, and cooling oil is provided for the rotor cooling oil path by utilizing the pressure drop of the high pressure area and the low pressure area of the oil collecting cavity, so that the system is very compact and high in reliability; the low-pressure area of the oil collecting cavity is directly connected with the cooling oil path of the controller, so that the system is more integrated, the stator cooling oil path, the rotor cooling oil path and the cooling oil path of the controller are collected to the low-pressure area of the oil collecting cavity and then flow out of the whole oil cooling system from a main outlet in the low-pressure area, and the system is very integrated and compact. On the other hand, the oil collecting cavity is not a separate space but a part of the controller radiator, so that the heat can be dissipated for the controller power module, and the power density of the motor system and the integration level of the system are further improved.
The motor and drive controller oil cooling integrated system provided by the invention has a compact structure, and the motor stator cooling oil path, the rotor cooling oil path and the controller cooling oil path are tightly connected with the oil collecting cavity, so that the integration level of the oil cooling system can be greatly improved, and the oil cooling system is simplified, high in integration level and high in reliability under the condition of meeting the heat dissipation performance of the motor stator, the rotor and the controller.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. An electric machine and drive controller integrated cooling oil circuit system, comprising: the cooling oil path of the stator, the cooling oil path of the rotor and the cooling oil path of the controller are integrated with the oil collecting cavity respectively;
the oil collecting cavity is used for collecting the stator cooling oil path, the rotor cooling oil path and the controller cooling oil path, so that the stator, the rotor and the driving controller of the motor can be cooled simultaneously on the occasion with limited space, and the heat of heating elements in the motor and the controller can be rapidly taken away;
when the cooling oil way system works, cooling oil enters the stator cooling oil way from an oil inlet, flows into the high-pressure area cavity of the oil converging cavity and the controller cooling oil way from an oil outlet of the stator cooling oil way, converges in the low-pressure area cavity of the oil converging cavity, and then flows out from an outlet of the cooling oil way system.
2. The cooling oil system of claim 1, wherein the oil collection cavity comprises: the high-pressure area cavity and the low-pressure area cavity are symmetrically arranged, and holes for cooling oil to pass through are formed in the symmetrical surfaces of the high-pressure area cavity and the low-pressure area cavity;
the high-pressure area cavity is provided with an oil inlet and two oil outlets, and the oil inlet of the high-pressure area cavity is arranged on the asymmetrical surface of the high-pressure area cavity and is used for being communicated with the oil outlet of the stator cooling oil path; a first oil outlet of the high-pressure area cavity is arranged on a symmetrical surface of the high-pressure area cavity and is used for being communicated with an oil inlet of the rotor cooling oil path; the second oil outlet of the high-pressure area cavity is arranged on the symmetrical surface of the high-pressure area cavity and is used for being communicated with the first oil inlet of the low-pressure area cavity;
the low-pressure area cavity is provided with two oil inlets and one oil outlet, and a second oil inlet of the low-pressure area cavity is communicated with the oil outlet of the rotor cooling oil path; a third oil inlet of the low-pressure area cavity is communicated with an oil outlet of the controller cooling oil way; and an oil outlet of the low-pressure area cavity is used as an outlet of the cooling oil way system.
3. The cooling oil circuit system according to claim 1, wherein the stator cooling oil circuit includes: the oil inlet, the oil outlet and the oil isolating ring;
the oil-separating ring is coaxially arranged with the machine shell, the outer wall of the oil-separating ring is matched with the inner wall of the iron core of the stator, and a plurality of holes for cooling oil to pass through are formed in the yoke part of the iron core of the stator;
the oil inlet is arranged on the front end cover and is used for providing an inlet for cooling oil;
the oil outlet is arranged on the rear end cover and used for providing an outlet for the cooling oil.
4. The cooling oil path system as claimed in claim 3, wherein the stator cooling oil path has four oil outlets, which are uniformly distributed along the circumferential direction of the rear end cover, three of the four oil outlets are communicated with the high pressure region of the oil collecting chamber, and one oil outlet is communicated with the oil inlet of the controller cooling oil path.
5. The cooling oil circuit system according to any one of claims 1 to 4, wherein the rotor cooling oil circuit includes: the oil inlet, the shaft of the rotor, the oil outlet and the oil conveying pipe;
the shaft of the rotor is of a hollow structure and one end of the shaft is open along the axial direction; the oil delivery pipe is coaxially arranged in the hollow structure of the shaft of the rotor, the outer diameter of the oil delivery pipe is smaller than the diameter of the hollow structure, and passages in the oil delivery pipe and between the outer wall of the oil delivery pipe and the inside of the hollow structure are used as passages of cooling oil;
one end of an oil inlet of the rotor cooling oil way is communicated with the high-pressure area cavity of the oil collecting cavity, and the other end of the oil inlet of the rotor cooling oil way is communicated with the oil conveying pipe;
one end of an oil outlet of the rotor cooling oil way is communicated with a passage between the outer wall of the oil conveying pipe and the interior of the hollow structure, and the other end of the oil outlet of the rotor cooling oil way is communicated with a low-pressure area cavity of the oil collecting cavity.
6. The cooling circuit system according to any one of claims 1 to 4, wherein the controller cooling circuit includes: the cooling oil pump comprises an oil inlet, an oil outlet, a first cavity, a second cavity and holes, wherein the first cavity and the second cavity are symmetrically and tightly arranged, and the holes are formed in the symmetrical surfaces of the first cavity and the second cavity and used for allowing cooling oil to pass through;
one end of an oil inlet of the controller cooling oil path is arranged on the asymmetrical surface of the first cavity, and the other end of the oil inlet of the controller cooling oil path is communicated with an outlet of the stator cooling oil path;
one end of an oil outlet of the controller cooling oil path is arranged on the asymmetrical surface of the second cavity, and the other end of the oil outlet of the controller cooling oil path is communicated with the low-pressure area of the oil collecting cavity.
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| KR102238301B1 (en) * | 2019-11-06 | 2021-04-09 | 송과모터스 주식회사 | Cooling structure of Rotor for driven motor |
| CN111564927B (en) * | 2020-05-18 | 2022-05-10 | 珠海格力电器股份有限公司 | Hollow shaft sealing ring, hollow shaft, rotor structure, motor and electric automobile |
| CN112383171B (en) * | 2020-10-13 | 2021-11-19 | 速珂智能科技（上海）有限公司 | Oil-cooling heat dissipation type electric vehicle motor |
| CN113474973A (en) * | 2020-10-23 | 2021-10-01 | 华为技术有限公司 | Motor, motor controller, heat exchange system and control method |
| CN113162267B (en) * | 2021-03-10 | 2023-04-14 | 安徽机电职业技术学院 | Integrated inner ring cooling type hub motor |
| US11777363B2 (en) * | 2021-04-29 | 2023-10-03 | Volvo Car Corporation | Electric machine with heat exchanging unit on surface of housing and cooling duct in rotor |
| CN113572289B (en) * | 2021-07-05 | 2022-05-31 | 合肥巨一动力系统有限公司 | Oil-cooling hollow rotating shaft structure |
| CN113595312B (en) * | 2021-07-21 | 2024-02-02 | 苏州英磁新能源科技有限公司 | Internal circulation cooling motor |
| CN114243997B (en) * | 2021-12-20 | 2023-05-30 | 盐城工学院 | Forced cooperative heat dissipation cooling device |
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| CN201393142Y (en) * | 2009-03-10 | 2010-01-27 | 武汉唯特特种电机有限公司 | Fluid-cooled electrical machine |
| CN202142954U (en) * | 2011-01-26 | 2012-02-08 | 先特精密工业股份有限公司 | Liquid cooling service driving device for plastic processing machine |
| CN202059236U (en) * | 2011-05-31 | 2011-11-30 | 欣达重工股份有限公司 | Cooling device of motor |
| WO2013069128A1 (en) * | 2011-11-10 | 2013-05-16 | 株式会社安川電機 | Rotating electrical machine |
| CN102638133B (en) * | 2012-03-23 | 2015-04-08 | 奇瑞汽车股份有限公司 | Permanent magnet motor |
| CN206865308U (en) * | 2017-05-15 | 2018-01-09 | 北京亿马先锋汽车科技有限公司 | Integrated motor and there is its automobile |
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