MX2014009363A - Electric motor -driven pump. - Google Patents

Abstract

In an electric motor-driven oil pump assembly for use with an engine in a vehicle, such as with an automatic engine-stop system in which an electric motor-driven oil pump is driven by an electric motor for hydraulic pressure supply to a transmission or engine of an automotive vehicle, at least in a stopped state of a mechanical oil pump driven by the engine, a controller for operating the motor for controlling the oil pump is provided in a housing proximal the flowing oil fluid such that the flowing oil fluid maintains the temperature of the controller below a predetermined temperature to avoid failure of the electronic components of the controller.

Description

PUMP DRIVEN BY ELECTRIC MOTOR DESCRIPTION OF THE INVENTION The present disclosure is generally related to pumps for use in generating a fluid flow. More particularly, the present disclosure relates to an oil pump controlled by a controller to generate a fluid flow such as an oil pump for use in an engine in a vehicle.

Generally, it is known that an oil pump is used to create a flow of liquid oil through an engine to cool and lubricate components of the drive train or engine during vehicle operation. Generally, it is also known how to operate the oil pump using an engine power socket. In some applications, it is also generally known how to provide an electric motor to operate the oil pump. Typically, it is also known how to provide a controller that includes a circuit board and other electronic components for use in controlling the oil pump during the operation of the vehicle. Most current applications have the controller built into the back of the housing. engine where it is cooled only by the air flow. These applications are limited by the maximum ambient temperature and the amount of energy (ie, current) that the system can consume before the electrical components of the controller overheat and turn off.

So, if the electronic control apparatus is provided in the vehicle's power generation compartment, the temperature in the compartment generally creates a potential problem. Although the air temperature in the compartment can be maintained at a sufficiently low temperature when a vehicle moves and / or operates since the fresh air flows can be used to transfer heat from the compartment, when the vehicle stops, as after of its operation at high speed, the air stagnates in the compartment and is heated by the heat of the engine, with the result that the air temperature in the compartment rises to a relatively high level which can lead to fatigue of component, failure or other problems.

To obtain an electric motor which is compact and capable of providing high output torque, a large current must be passed through the proper motor coil and in this way the controller must be able to provide such high current to the motor. Running a large current through the motor coil and the controller used to drive the power supply to the motor can cause the motor and / or the controller to heat up and if it gets too hot, fail eventually. Generally, it is required that the motor be cooled and that the controller be located at a distance from the motor and the heat source to protect the controller from excessive heat. In addition, it is generally known how to use very expensive components in the controller capable of operating properly at such high temperatures. Therefore, space must be provided to locate the controller and motor to be able to function. However, it is very difficult to provide additional space to accommodate the installation of the electric motor and the controller because the space is already very limited, particularly, in the aforementioned motor vehicle applications. In this way, it is very difficult to provide the electric motor and the pump in a limited space. This has made implementing a pump driven by an electric motor almost impossible and very expensive.

The present description is based on the object of providing a pump driven by electric motor and control device by means of which the above-described problems of the prior art are avoided.

In an exemplary embodiment, an electric motor-driven pump and integrated controller is described that includes a housing in which the controller is arranged, which includes power control components (e.g., MOSFETS) to supply power to the motor, is arranged for controlling the rotational speed of a fluid pump and the output of the fluid pump that is supplied to a vehicle component. The electric motor driven pump includes a motor portion located at one end, the fluid pump in the middle part and an input / output housing portion that includes an integrated portion to contain the controller and its components so that the portion Integrated is located near the fluid flowing in the inlet and outlet and has sufficient thermal conductivity to sufficiently dissipate the heat from the controller located in a cavity formed in the inlet / outlet housing portion. The input / output housing portion may also include one or more passages which extend in parallel to the central axis of the pump and the motor for receiving the cables required to electrically couple the motor controller and stator, in a manner that the cables also pass through a sealed passageway that extends axially through the fluid pump. Additionally, the fluid passes through the pump and the electric drive motor to dissipate heat from all components of the assembly.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings illustrate, by way of example only, embodiments of the present disclosure wherein: Figure 1 is a perspective graphical view of an exemplary combination of motor-driven pump and controller and housing system according to the present disclosure; Figure 2 is an exploded perspective exploded view of the combination of motor-driven pump and controller and housing system of the exemplary embodiment of Figure 1 according to the present disclosure; Figure 3 is a cross-sectional graphical view of the combination of motor-driven pump and controller and housing system of the exemplary embodiment of Figure 1 according to the present disclosure; Figure 4 is an exploded perspective exploded view of an alternative embodiment of a combination of motor-driven pump and controller and housing system of the exemplary embodiment of Figure 1 according to the present disclosure; Figure 5 is a perspective graphical view of a thermal image analysis for the combination of motor-driven pump and controller and housing system of the exemplary embodiment of Figure 1 according to the present disclosure; Figure 6 is a perspective graphical view of an alternative exemplary embodiment of a pump combination driven by electric motor and controller and system of accommodation according to the present description showing the details of the innovation; Figure 7 is a further alternative partial perspective graphical view of the exemplary embodiment of Figure 6 with the controller cover and the removed controller showing the passages for guiding the cables for the controller and the motor; Figure 8 is a perspective graphical view and a further alternative embodiment of a pump for inclusion in a combination of motor-driven pump controller and housing system deploying an alternative side for coupling the pump housing to the motor to include the controller inside the housing and affect the cooling thereof; Figure 9 is a perspective graphical view of a further alternative embodiment of a pump for inclusion in a combination of motor driven pump and controller and housing system similar to Figure 8 and showing an oil inlet / outlet member alternative; Figure 10 is a cross-sectional graphical view and the alternative alternative embodiment of a pump for inclusion in the motor-driven pump of the exemplary embodiment of Figure 9 in accordance with the present disclosure; Figure 11 is a perspective graphical view of a further alternative embodiment of a pump for inclusion in a combination of motor-driven pump, controller and housing system similar to Figure 8 and showing an oil inlet / outlet member alternative; Figure 12 is an exploded perspective exploded view of the alternative alternative embodiment of a pump combination for inclusion in the motor-driven pump of the alternative exemplary embodiment of Figure 11 in accordance with the present disclosure and showing an embodiment of interleaved blades according to the present disclosure; Figure 13 is a perspective graphical view of a further alternative embodiment of a pump for inclusion in the motor-driven pump and the controller and the housing system including a cross-linked vane similar to Figure 12; Figure 14 is a partial perspective graphical view of the alternative alternative embodiment of the pump for inclusion in the engine-driven pump combination of the alternative exemplary embodiment of Figure 13 according to the present disclosure; Figure 15 is a perspective graphical view of the additional alternative embodiment of Figure 12 which shows the detail of the variable displacement pump and the cross-blade design; Fig. 16 is a partial plan graphical view of the additional alternative embodiment of Figs. 12 and 15 which further shows the detail of the variable displacement pump and the design of interleaved blades according to the present disclosure; Y Figure 17 is a diagrammatic view and exemplary boundary diagram of the combination of motor-driven pump and controller and housing system according to the present disclosure.

With reference in general to all the figures, the present description and teachings described herein are provided for a combination of motor-driven pump, controller and housing system, hereinafter referred to as oil pump assembly 10 driven by electric motor , for use in automotive applications such as together with a vehicle engine or transmission train, such as a transmission. The electric motor driven oil pump assembly 10 provides lubrication, cooling and pressure in various system configurations. The primary elements of this electric pump-driven oil pump assembly system 10 are: the pump 20 which can be of any known or suitable type (such as a fixed displacement type pump or variable), a motor 30, in particular a brushless direct current (DC) type motor, and a motor controller 40, such as a power inverter and an appropriate electrical cctor for electrically coupling the motor-driven oil pump 10 electrical to an electrical power source (such as a battery or similar type device). In addition, the electric motor driven oil pump assembly 10 may also include known and / or appropriate diagnostic and sensor signals (not shown). The electric motor driven oil pump assembly 10 is configured so that the entire assembly can be fully integrated (i.e., the pump 20, the motor 30, the controller 40 and the electrical cctor) and contained in a sealed body 60 ( integrated) simple due to system restrictions such as packaging. However, in the application, such a system is exposed to high ambient temperatures due to locations and mounting positions directly on the transmission or engine body (not shown) and even, sometimes, locations within the transmission body. In these applications, the electric motor driven oil pump assembly 10 is typically exposed to potentially very severe environments including high temperatures. The most sensitive component at high ambient temperatures is the motor controller 40 which has the effect of limiting the temperature of maximum operation of the oil pump assembly 10 driven by electric motor. Currently, the maximum operating temperatures for the motor controller subcomponents are generally as follows: 175 degrees Celsius for the FET junction, 150 degrees Celsius for the CU motor controller unit and 135 degrees Celsius for the capacitor.

To ensure that. indicated temperature limits are not exceeded during operation at maximum ambient temperature (Ta = 138 degrees Celsius), the oil pump 20 uses oil flow to cool the controller 40. Mainly, the benefit of the oil pump assembly 10 driven by The electric motor according to the present description is that it allows the operation of the oil pump assembly 10 driven by an electric motor under relatively higher ambient temperature conditions and at the same time it allows the possibility of reducing the cost by using electronic components of lower temperature compared to known systems. As best shown in Figure 5, according to a set of exemplary operating conditions (i.e. ambient air at 138 degrees Celsius), the temperature of the oil flowing through the pump 20 maintains the oil at the inlet and at the exit at 125 degrees Celsius, which is below the indicated temperature limits. Similarly, in Figure 6, the oil flows to 4.5 liters per minute (lpm) and the controller 40 is located in a first portion of an input / output housing 44 coupled to the oil pump assembly 20. The first portion of the input / output housing 44 includes a first cavity 42 for receiving the controller 40 therein and having a cover 46 secured to the input / output housing for sealing the controller 40 and its components in the first cavity. The material of the input / output housing 44 is preferably chosen to have a relatively high thermal conductivity such as a metal, such as aluminum or an aluminum alloy or other known or suitable materials. The first cavity 42 in the input / output housing 44 includes at least a first passage 45 extending from the first cavity 42 to the pump 20 and up to a stator of the brushless DC motor 30. As best shown in the embodiment of Figure 4, a busbar can be included in the motor assembly 30, coupled to the stator, and including an extension for passing through a sealed passageway extending through the pump 20. and towards the passage of the entry / exit housing to be coupled and electrically connected to the controller 40 therein.

As shown in the cross section of Figure 3, the controller 40 is located in the first cavity to be located reasonably and closely close to the passages inlet and outlet in the inlet / outlet housing 44 so that there is efficient heat transfer between the controller 40 and the fluid flowing therethrough. As the oil flows into the assembly 10, it will have a relatively lower temperature than the heat produced by the engine 30 and will flow through the pump 20, through the engine 30 and then again through the engine 30 and out of the engine. inlet / outlet housing 44 where it will have a hydraulic pressure and flow to the vehicle component, such as a transmission or motor as well as, optionally, a heat exchanger where the oil can be cooled using any known or appropriate system and then returned to the assembly 10. In the embodiments shown, it is possible for the motor 30 to be completely sealed so that the fluid flowing through the motor is completely sealed so that the fluid does not and can not make contact with any of the electrical components of the motor. or the controller 40. A fully sealed assembly 10 is particularly significant and important for a fluid to cause the components electrical components short, such as water. Alternatively, in order that a fluid does not cause the electrical components to short circuit, it is possible for the motor 30 and the controller 40 to be sealed or not partially sealed so that the fluid can make contact with the fluid. the electrical components and therefore increase the heat transfer away from the electrical components.

In an alternative embodiment shown in Figures 8 to 14, the pump 120 is shown having a controller 140 located on a side surface of the pump 120. In particular, different types of pumps can be used such as the external rotor blade pump Figures 9 and 10 as well as the criss-cross blade pump of Figures 11 to 15 incorporating the teachings and description of the present innovation. As it should be understood from the present description, it is possible to incorporate the teachings and descriptions of the present innovation into the engine designs that provide a variety of performance requirements and specifications including internal and external rotors, having applications between at least 12 Volts and 300 Volts. In addition, it is possible to design the controller to provide a wide variety of design requirements such as FOC and Block, and 12V and 300V applications, as well as to include a variety of control strategies (ie, control strategies based on the speed of the motor, torsion, and current as well as based on pump pressure). Accordingly, it should also be understood that the assembly 10 of the present disclosure allows a variety of communication protocols to be used that include but are not limited to PW, K-line, LINE, CAN or any other known or appropriate protocol. Accordingly, it is possible to provide an assembly 10 that is optimized for a significant variety of specifications and design preferences.

In particular, it is contemplated that the assembly 10 according to the present disclosure will provide a novel engine design to increase pump performance driven by the general electric motor while increasing the efficiency and reliability of the assembly 10 while reducing the cost of the components of the assembly. controller 40 and therefore the overall costs of the assembly 10.

Now with reference in particular to the cross-linked vane pump of Figures 13 to 16, an oil pump 200 is shown. The pump 200 includes a top plate, a motor and an external pump rotor and an inner pump rotor, as best shown in Figures 15 and 16. In particular, it should be understood that the outer pump rotor and the pump rotor inside both rotate with respect to the fixed hub. It should further be noted that pump 200 includes first, second and third blades (Alabe 1, Alabe 2, and Alabe 3, respectively). Similar to the previous assembly 10, the pump 200 includes a controller (or PCB) coupled to a Base Plate and located under a Top Plate (or Cover) as best shown in Figures 13 and 14. The controller (PCB) is installed in the back side of the Base Plate so that its heat will be dissipated by the fluid that flows from the Entrance Louvre to the Exit Louvre.

The internal components of the electric motor-driven oil pump 200 generally include the Motor Rotor, the Outer Pump Rotor, Alabe 1, Blade 2, Blade 3, the Inside Pump Rotor and the Bushing all coupled together as shown. The Inlet Port and the Outlet Port are located on the Base Plate and are coupled to the pump 200 to flow the fluid through the pump using the cross-blade design as shown.

The External Pump Rotor is preferably pressed on the Motor Rotor. The External Pump Rotor includes in a first location a half circle or ripple in the inner gauge of the External Pump Rotor to receive a first end of the Pipe 1. The Pylon 1 extends from the ripple in the inner gauge of the External Pump Rotor. and through a first slot located transversely through the Inside Pump Rotor. The Blade 2 and Blade 3 are installed in the second and third slots of the Internal Pump Rotor and each is guided by the shaped contour of the inner circumference of the gauge or passage of the External Pump Rotor. The outline of the inner circumference of the gauge or passage of the External Pump Rotor is shaped to affect the operation of the Blades 1, 2 and 3 during rotation of the rotors for that the pump 200 performs in compliance with the desired design requirements. When the engine 200 is running, the Motor Rotor and the External Pump Rotor will rotate in an anti-clockwise direction as shown in Figure 15, and will propel the Alabe 1 and the Inside Pump Rotor and then propel the Alabe. 2 and Alabe 3 but, the three Blades will only oscillate from back to front during certain angles related to the Pump Rotor to move the fluid through the pump 200 causing the oil to flow from the Inlet Port through the pump to the pump. the Output Louvre.

The configuration of the pump 200 according to the present description is selected such that the External Pump Rotor is a transmission member and the Inner Rotor is driven by the Blade 1 connected to the External Pump Rotor. This type of pump transmission method and configuration is unique so that the contour of the inner circumference of the gauge or passage of the External Pump Rotor is a preselected curve so that when the External Pump Rotor is rotated, the three Blades 1, 2 and 3 will oscillate from back to front during certain angles related to the Pump Rotor.

The pump 200 of the present invention particularly benefits from the current design because the oil pump 200 driven by electric motor can operate in high ambient temperature conditions while allowing the possibility of a significantly reduced cost by using electronic components of lower temperature degree in the controller (PCB) as well as a reduced number of mechanical components that make up the pump 200 compared to conventional vane pumps thus reducing the cost additionally.

Any numerical values described herein or in the figures are intended to include all values from the lowest value to the highest value in increments of one unit as long as there is a separation of at least 2 units between any lower value and any higher value . As an example, if it is stated that the amount of a component or a value of a process variable such as, for example, temperature, pressure, time and the like, for example, is from 1 to 90, preferably from 20 to 80, more preferably from 30 to 70, it is intended that values such as 15 to 85, 22 to 68, 43 to 51, 30 to 32, etc., be expressly listed in this specification. For values that are less than one, a unit is considered to be 0.0001, 0.001, 0.01 or 0.1 when appropriate. These are only examples of what is specifically intended and all possible combinations of numerical values between the lowest value and the highest value listed will be considered as expressly stated in this application in a similar manner. As can be seen, the teaching of amounts expressed as "parts by weight" in the present also contemplates the same margins expressed in terms of percentage by weight. Thus, an expression in the Detailed Description of the Invention of a margin in terms of in "'?' parts by weight of the resultant polymer blend composition "also contemplates a teaching of margins of the same described amount of" '?' in percent by weight of the resultant polymer blend composition ".

Unless stated otherwise, all margins include both reference values and all numbers between the reference values. The use of "around" or "approximately" together with a margin applies to both ends of the margin. Thus, "about 20 to 30" is intended to cover "about 20 to about 30", including at least the specified reference values.

Descriptions of all articles and references, including patent applications and publications, are incorporated for reference for all purposes. The term "consists essentially of" to describe a combination shall include the elements, ingredients, components or steps identified, and the rest elements, ingredients, components or stages that do not materially affect the basic and novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, ingredients, components or steps herein also contemplates modalities consisting essentially of the elements, ingredients, components or steps. Through the use of the term "may" in the present, it is intended that any attributes described that "may" be included are optional.

Elements, ingredients, components or stages in the plural may be provided by an integrated element, ingredient, component or stage in the singular. Alternatively, an integrated element, ingredient, component or stage in the singular can be divided into separate plural elements, ingredients, components or stages. The description of "a" or "an" to describe an element, ingredient, component or step is not intended to exclude additional elements, ingredients, components or steps.

It is understood that the foregoing description is intended to be illustrative and not restrictive. Many embodiments as well as many applications in addition to the examples provided will be apparent to those skilled in the art upon reading the above description. The scope of the invention, therefore, must be determined not with reference to the above description, but must be determined in fact with reference to the appended claims, together with the total scope of equivalents to which such claims are intended. Descriptions of all articles and references, including patent applications and publications, are incorporated for reference for all purposes. The omission in the following claims of any aspect of subject matter that is described herein is not a waiver of such subject matter, nor should it be considered that the invention does not consider such subject matter to be part of the inventive subject matter described.

Claims (16)

1. A pump assembly driven by an electric motor for supplying hydraulic pressure fluid, the assembly characterized in that it comprises: an electric motor that has a crankcase; a pump having a pump housing with a first end and a second end and wherein the motor housing is coupled to the first end of the pump housing, the pump includes a passage of pump fluid connected to the motor to transport the fluid to the pump housing. motor; a controller housing having a first end coupled to the second end of the pump housing, the controller housing includes an inlet passage to receive the fluid and an outlet passage to transport the fluid, the inlet passage is connected to the passageway of pump fluid to transport the fluid to the pump and through the motor to transfer heat from the motor to the fluid before the fluid flows back to the pump and out of the assembly through the outlet passage of the controller housing, in wherein a first portion of the controller housing is located adjacent the inlet and outlet passages to provide heat transfer between the fluid and the first portion; Y a controller located in the first portion of the controller housing and electrically connected to the motor to supply power to the motor to thereby control the speed of the pump and the fluid output from the pump, where the heat produced by the controller is transferred to the fluid flowing through the passages of entry and exit.

2. The assembly in accordance with the claim 1, characterized in that the controller housing includes a cavity located in the first portion, wherein the controller is located in the cavity, and wherein the controller housing includes a first passage to receive conductive wires for coupling to the controller and the motor.

3. The assembly in accordance with the claim 2, characterized in that the pump and motor are sealed to prevent the fluid from contacting the controller.

4. The assembly according to Claim 2, characterized in that the pump and the motor are not sealed so that the fluid flowing through the pump can make contact with the controller to provide heat transfer from the controller to the fluid while Do not cause an electric short in the controller or motor.

5. The assembly according to Claim 1, characterized in that the inlet and outlet passage extend in a direction substantially perpendicular to the Assembly axis.

6. The assembly according to Claim 5, characterized in that the controller is aligned at an angle with respect to the axis of the assembly.

7. The assembly according to Claim 1, characterized in that the controller housing comprises aluminum and the controller comprises at least one MOSFET for supplying driving forces to induce a magnetic field to control and drive the electric motor.

8. A pump assembly for supplying hydraulic pressure to a fluid, the pump assembly characterized in that it comprises: controller housing; a motor housing coupled to the controller housing; an engine ring; an outer pump rotor coupled to the motor ring and having a shaped inner circumference including a shaped anchor portion, an internal pump rotor having a plurality of grooves separated in arc; a first vane having a first end located in the anchoring portion formed in the outer pump rotor, the first vane extends through a first pair of slots in the inner pump rotor; Y second and third blades extend through the second and third pairs of grooves in the inner pump rotor; wherein the ends of the first, second and third blades follow the contour of the inner circumference of the passage of the pump outer rotor and will oscillate from back to front along an angle defined by the pump rotor.

9. The pump assembly according to Claim 8, characterized in that the pump outer rotor is the transmission member and the pump inner rotor is driven by the first vane connected to the pump outer rotor.

10. The pump assembly according to claim 8, characterized in that the contour of the inner circumference of the passage of the outer rotor of the pump is a preselected curve and the rotation of the outer rotor of the pump moves the first, second and third blades to oscillate from the rear. forward.

11. The pump assembly according to claim 8, characterized in that the controller is located near the motor ring, the external pump rotor, the internal pump rotor and the first, second and third vanes so that the fluid flowing to the pump through the pump receives the heat from the controller.

12. The assembly according to Claim 1, characterized in that the electric motor includes a stator and a busbar coupled to the stator, the controller housing includes a cavity located in the first portion and a first passage extending from the cavity to the pump , and the controller is located in the cavity; the pump includes a sealed passageway extending from the first passage of the controller housing to the electric motor; and the busbar of the electric motor includes an extension that passes through the sealed passage of the pump and into the first passage of the controller housing and engages the controller.

13. The assembly according to claim 1, characterized in that the pump further comprises a knob and a cross-linked vane received in and extending outwardly from the knob; and the electric motor includes a motor rotor that surrounds the interlaced blade and a stator that surrounds the motor rotor.

14. The assembly according to Claim 1, characterized in that the pump further comprises: a fixed bushing; an internal pump rotor that surrounds the fixed bushing and that rotates with respect to the fixed hub; an external pump rotor that surrounds the inner rotor of the pump and rotates with respect to the fixed hub; Y a plurality of blades spaced from one another and extending from the fixed hub through the inner pump rotor to the outer pump rotor.

15. The assembly according to claim 14, characterized in that the electric motor includes a motor rotor and the outer pump rotor is pressed into the motor rotor; the external pump rotor has an internal gauge that receives one end of each of the blades; the inner pump rotor includes slots that allow the vanes to extend therethrough; Y wherein the motor rotor and the outer pump rotor rotate in the same direction and drive the inner pump rotor and the first of the blades followed by the second of the blades and the third of the blades, and the blades oscillate from the rear forward in angles related to a curve that presents the internal caliber of the external rotor of the pump.

16. The assembly according to claim 1, characterized in that the electric motor includes a passage of motor fluid to transport the fluid, and the pump fluid passage is connected to the engine fluid passage to transport the fluid to the engine.